includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  */
   5
   6 /**
   7  * Class representing a MediaWiki article and history.
   8  *
   9  * See design.txt for an overview.
  10  * Note: edit user interface and cache support functions have been
  11  * moved to separate EditPage and HTMLFileCache classes.
  12  *
  13  */
  14 class Article {
  15         /**@{{
  16          * @private
  17          */
  18         var $mComment;                  //!<
  19         var $mContent;                  //!<
  20         var $mContentLoaded;    //!<
  21         var $mCounter;                  //!<
  22         var $mForUpdate;                //!<
  23         var $mGoodAdjustment;   //!<
  24         var $mLatest;                   //!<
  25         var $mMinorEdit;                //!<
  26         var $mOldId;                    //!<
  27         var $mRedirectedFrom;   //!<
  28         var $mRedirectUrl;              //!<
  29         var $mRevIdFetched;             //!<
  30         var $mRevision;                 //!<
  31         var $mTimestamp;                //!<
  32         var $mTitle;                    //!<
  33         var $mTotalAdjustment;  //!<
  34         var $mTouched;                  //!<
  35         var $mUser;                             //!<
  36         var $mUserText;                 //!<
  37         /**@}}*/
  38
  39         /**
  40          * Constructor and clear the article
  41          * @param $title Reference to a Title object.
  42          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  43          */
  44         function __construct( &$title, $oldId = null ) {
  45                 $this->mTitle =& $title;
  46                 $this->mOldId = $oldId;
  47                 $this->clear();
  48         }
  49
  50         /**
  51          * Tell the page view functions that this view was redirected
  52          * from another page on the wiki.
  53          * @param $from Title object.
  54          */
  55         function setRedirectedFrom( $from ) {
  56                 $this->mRedirectedFrom = $from;
  57         }
  58
  59         /**
  60          * @return mixed false, Title of in-wiki target, or string with URL
  61          */
  62         function followRedirect() {
  63                 $text = $this->getContent();
  64                 $rt = Title::newFromRedirect( $text );
  65
  66                 # process if title object is valid and not special:userlogout
  67                 if( $rt ) {
  68                         if( $rt->getInterwiki() != '' ) {
  69                                 if( $rt->isLocal() ) {
  70                                         // Offsite wikis need an HTTP redirect.
  71                                         //
  72                                         // This can be hard to reverse and may produce loops,
  73                                         // so they may be disabled in the site configuration.
  74
  75                                         $source = $this->mTitle->getFullURL( 'redirect=no' );
  76                                         return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
  77                                 }
  78                         } else {
  79                                 if( $rt->getNamespace() == NS_SPECIAL ) {
  80                                         // Gotta handle redirects to special pages differently:
  81                                         // Fill the HTTP response "Location" header and ignore
  82                                         // the rest of the page we're on.
  83                                         //
  84                                         // This can be hard to reverse, so they may be disabled.
  85
  86                                         if( $rt->isSpecial( 'Userlogout' ) ) {
  87                                                 // rolleyes
  88                                         } else {
  89                                                 return $rt->getFullURL();
  90                                         }
  91                                 }
  92                                 return $rt;
  93                         }
  94                 }
  95
  96                 // No or invalid redirect
  97                 return false;
  98         }
  99
 100         /**
 101          * get the title object of the article
 102          */
 103         function getTitle() {
 104                 return $this->mTitle;
 105         }
 106
 107         /**
 108           * Clear the object
 109           * @private
 110           */
 111         function clear() {
 112                 $this->mDataLoaded    = false;
 113                 $this->mContentLoaded = false;
 114
 115                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
 116                 $this->mRedirectedFrom = null; # Title object if set
 117                 $this->mUserText =
 118                 $this->mTimestamp = $this->mComment = '';
 119                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
 120                 $this->mTouched = '19700101000000';
 121                 $this->mForUpdate = false;
 122                 $this->mIsRedirect = false;
 123                 $this->mRevIdFetched = 0;
 124                 $this->mRedirectUrl = false;
 125                 $this->mLatest = false;
 126         }
 127
 128         /**
 129          * Note that getContent/loadContent do not follow redirects anymore.
 130          * If you need to fetch redirectable content easily, try
 131          * the shortcut in Article::followContent()
 132          * FIXME
 133          * @todo There are still side-effects in this!
 134          *        In general, you should use the Revision class, not Article,
 135          *        to fetch text for purposes other than page views.
 136          *
 137          * @return Return the text of this revision
 138         */
 139         function getContent() {
 140                 global $wgUser, $wgOut;
 141
 142                 wfProfileIn( __METHOD__ );
 143
 144                 if ( 0 == $this->getID() ) {
 145                         wfProfileOut( __METHOD__ );
 146                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 147
 148                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 149                                 $ret = wfMsgWeirdKey ( $this->mTitle->getText() ) ;
 150                         } else {
 151                                 $ret = wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' );
 152                         }
 153
 154                         return "<div class='noarticletext'>$ret</div>";
 155                 } else {
 156                         $this->loadContent();
 157                         wfProfileOut( __METHOD__ );
 158                         return $this->mContent;
 159                 }
 160         }
 161
 162         /**
 163          * This function returns the text of a section, specified by a number ($section).
 164          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
 165          * the first section before any such heading (section 0).
 166          *
 167          * If a section contains subsections, these are also returned.
 168          *
 169          * @param $text String: text to look in
 170          * @param $section Integer: section number
 171          * @return string text of the requested section
 172          * @deprecated
 173          */
 174         function getSection($text,$section) {
 175                 global $wgParser;
 176                 return $wgParser->getSection( $text, $section );
 177         }
 178
 179         /**
 180          * @return int The oldid of the article that is to be shown, 0 for the
 181          *             current revision
 182          */
 183         function getOldID() {
 184                 if ( is_null( $this->mOldId ) ) {
 185                         $this->mOldId = $this->getOldIDFromRequest();
 186                 }
 187                 return $this->mOldId;
 188         }
 189
 190         /**
 191          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 192          *
 193          * @return int The old id for the request
 194          */
 195         function getOldIDFromRequest() {
 196                 global $wgRequest;
 197                 $this->mRedirectUrl = false;
 198                 $oldid = $wgRequest->getVal( 'oldid' );
 199                 if ( isset( $oldid ) ) {
 200                         $oldid = intval( $oldid );
 201                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 202                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 203                                 if ( $nextid  ) {
 204                                         $oldid = $nextid;
 205                                 } else {
 206                                         $this->mRedirectUrl = $this->mTitle->getFullURL( 'redirect=no' );
 207                                 }
 208                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 209                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 210                                 if ( $previd ) {
 211                                         $oldid = $previd;
 212                                 } else {
 213                                         # TODO
 214                                 }
 215                         }
 216                         # unused:
 217                         # $lastid = $oldid;
 218                 }
 219
 220                 if ( !$oldid ) {
 221                         $oldid = 0;
 222                 }
 223                 return $oldid;
 224         }
 225
 226         /**
 227          * Load the revision (including text) into this object
 228          */
 229         function loadContent() {
 230                 if ( $this->mContentLoaded ) return;
 231
 232                 # Query variables :P
 233                 $oldid = $this->getOldID();
 234
 235                 # Pre-fill content with error message so that if something
 236                 # fails we'll have something telling us what we intended.
 237                 $this->mOldId = $oldid;
 238                 $this->fetchContent( $oldid );
 239         }
 240
 241
 242         /**
 243          * Fetch a page record with the given conditions
 244          * @param Database $dbr
 245          * @param array    $conditions
 246          * @private
 247          */
 248         function pageData( $dbr, $conditions ) {
 249                 $fields = array(
 250                                 'page_id',
 251                                 'page_namespace',
 252                                 'page_title',
 253                                 'page_restrictions',
 254                                 'page_counter',
 255                                 'page_is_redirect',
 256                                 'page_is_new',
 257                                 'page_random',
 258                                 'page_touched',
 259                                 'page_latest',
 260                                 'page_len' ) ;
 261                 wfRunHooks( 'ArticlePageDataBefore', array( &$this , &$fields ) )       ;
 262                 $row = $dbr->selectRow( 'page',
 263                         $fields,
 264                         $conditions,
 265                         'Article::pageData' );
 266                 wfRunHooks( 'ArticlePageDataAfter', array( &$this , &$row ) )   ;
 267                 return $row ;
 268         }
 269
 270         /**
 271          * @param Database $dbr
 272          * @param Title $title
 273          */
 274         function pageDataFromTitle( $dbr, $title ) {
 275                 return $this->pageData( $dbr, array(
 276                         'page_namespace' => $title->getNamespace(),
 277                         'page_title'     => $title->getDBkey() ) );
 278         }
 279
 280         /**
 281          * @param Database $dbr
 282          * @param int $id
 283          */
 284         function pageDataFromId( $dbr, $id ) {
 285                 return $this->pageData( $dbr, array( 'page_id' => $id ) );
 286         }
 287
 288         /**
 289          * Set the general counter, title etc data loaded from
 290          * some source.
 291          *
 292          * @param object $data
 293          * @private
 294          */
 295         function loadPageData( $data = 'fromdb' ) {
 296                 if ( $data === 'fromdb' ) {
 297                         $dbr = $this->getDB();
 298                         $data = $this->pageDataFromId( $dbr, $this->getId() );
 299                 }
 300
 301                 $lc =& LinkCache::singleton();
 302                 if ( $data ) {
 303                         $lc->addGoodLinkObj( $data->page_id, $this->mTitle );
 304
 305                         $this->mTitle->mArticleID = $data->page_id;
 306
 307                         # Old-fashioned restrictions.
 308                         $this->mTitle->loadRestrictions( $data->page_restrictions );
 309
 310                         $this->mCounter     = $data->page_counter;
 311                         $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
 312                         $this->mIsRedirect  = $data->page_is_redirect;
 313                         $this->mLatest      = $data->page_latest;
 314                 } else {
 315                         if ( is_object( $this->mTitle ) ) {
 316                                 $lc->addBadLinkObj( $this->mTitle );
 317                         }
 318                         $this->mTitle->mArticleID = 0;
 319                 }
 320
 321                 $this->mDataLoaded  = true;
 322         }
 323
 324         /**
 325          * Get text of an article from database
 326          * Does *NOT* follow redirects.
 327          * @param int $oldid 0 for whatever the latest revision is
 328          * @return string
 329          */
 330         function fetchContent( $oldid = 0 ) {
 331                 if ( $this->mContentLoaded ) {
 332                         return $this->mContent;
 333                 }
 334
 335                 $dbr = $this->getDB();
 336
 337                 # Pre-fill content with error message so that if something
 338                 # fails we'll have something telling us what we intended.
 339                 $t = $this->mTitle->getPrefixedText();
 340                 if( $oldid ) {
 341                         $t .= ',oldid='.$oldid;
 342                 }
 343                 $this->mContent = wfMsg( 'missingarticle', $t ) ;
 344
 345                 if( $oldid ) {
 346                         $revision = Revision::newFromId( $oldid );
 347                         if( is_null( $revision ) ) {
 348                                 wfDebug( __METHOD__." failed to retrieve specified revision, id $oldid\n" );
 349                                 return false;
 350                         }
 351                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 352                         if( !$data ) {
 353                                 wfDebug( __METHOD__." failed to get page data linked to revision id $oldid\n" );
 354                                 return false;
 355                         }
 356                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 357                         $this->loadPageData( $data );
 358                 } else {
 359                         if( !$this->mDataLoaded ) {
 360                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 361                                 if( !$data ) {
 362                                         wfDebug( __METHOD__." failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 363                                         return false;
 364                                 }
 365                                 $this->loadPageData( $data );
 366                         }
 367                         $revision = Revision::newFromId( $this->mLatest );
 368                         if( is_null( $revision ) ) {
 369                                 wfDebug( __METHOD__." failed to retrieve current page, rev_id {$data->page_latest}\n" );
 370                                 return false;
 371                         }
 372                 }
 373
 374                 // FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 375                 // We should instead work with the Revision object when we need it...
 376                 $this->mContent = $revision->userCan( Revision::DELETED_TEXT ) ? $revision->getRawText() : "";
 377                 //$this->mContent   = $revision->getText();
 378
 379                 $this->mUser      = $revision->getUser();
 380                 $this->mUserText  = $revision->getUserText();
 381                 $this->mComment   = $revision->getComment();
 382                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 383
 384                 $this->mRevIdFetched = $revision->getID();
 385                 $this->mContentLoaded = true;
 386                 $this->mRevision =& $revision;
 387
 388                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ) ;
 389
 390                 return $this->mContent;
 391         }
 392
 393         /**
 394          * Read/write accessor to select FOR UPDATE
 395          *
 396          * @param $x Mixed: FIXME
 397          */
 398         function forUpdate( $x = NULL ) {
 399                 return wfSetVar( $this->mForUpdate, $x );
 400         }
 401
 402         /**
 403          * Get the database which should be used for reads
 404          *
 405          * @return Database
 406          */
 407         function getDB() {
 408                 return wfGetDB( DB_MASTER );
 409         }
 410
 411         /**
 412          * Get options for all SELECT statements
 413          *
 414          * @param $options Array: an optional options array which'll be appended to
 415          *                       the default
 416          * @return Array: options
 417          */
 418         function getSelectOptions( $options = '' ) {
 419                 if ( $this->mForUpdate ) {
 420                         if ( is_array( $options ) ) {
 421                                 $options[] = 'FOR UPDATE';
 422                         } else {
 423                                 $options = 'FOR UPDATE';
 424                         }
 425                 }
 426                 return $options;
 427         }
 428
 429         /**
 430          * @return int Page ID
 431          */
 432         function getID() {
 433                 if( $this->mTitle ) {
 434                         return $this->mTitle->getArticleID();
 435                 } else {
 436                         return 0;
 437                 }
 438         }
 439
 440         /**
 441          * @return bool Whether or not the page exists in the database
 442          */
 443         function exists() {
 444                 return $this->getId() != 0;
 445         }
 446
 447         /**
 448          * @return int The view count for the page
 449          */
 450         function getCount() {
 451                 if ( -1 == $this->mCounter ) {
 452                         $id = $this->getID();
 453                         if ( $id == 0 ) {
 454                                 $this->mCounter = 0;
 455                         } else {
 456                                 $dbr = wfGetDB( DB_SLAVE );
 457                                 $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 458                                         'Article::getCount', $this->getSelectOptions() );
 459                         }
 460                 }
 461                 return $this->mCounter;
 462         }
 463
 464         /**
 465          * Determine whether a page  would be suitable for being counted as an
 466          * article in the site_stats table based on the title & its content
 467          *
 468          * @param $text String: text to analyze
 469          * @return bool
 470          */
 471         function isCountable( $text ) {
 472                 global $wgUseCommaCount;
 473
 474                 $token = $wgUseCommaCount ? ',' : '[[';
 475                 return
 476                         $this->mTitle->isContentPage()
 477                         && !$this->isRedirect( $text )
 478                         && in_string( $token, $text );
 479         }
 480
 481         /**
 482          * Tests if the article text represents a redirect
 483          *
 484          * @param $text String: FIXME
 485          * @return bool
 486          */
 487         function isRedirect( $text = false ) {
 488                 if ( $text === false ) {
 489                         $this->loadContent();
 490                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 491                 } else {
 492                         $titleObj = Title::newFromRedirect( $text );
 493                 }
 494                 return $titleObj !== NULL;
 495         }
 496
 497         /**
 498          * Returns true if the currently-referenced revision is the current edit
 499          * to this page (and it exists).
 500          * @return bool
 501          */
 502         function isCurrent() {
 503                 # If no oldid, this is the current version.
 504                 if ($this->getOldID() == 0)
 505                         return true;
 506
 507                 return $this->exists() &&
 508                         isset( $this->mRevision ) &&
 509                         $this->mRevision->isCurrent();
 510         }
 511
 512         /**
 513          * Loads everything except the text
 514          * This isn't necessary for all uses, so it's only done if needed.
 515          * @private
 516          */
 517         function loadLastEdit() {
 518                 if ( -1 != $this->mUser )
 519                         return;
 520
 521                 # New or non-existent articles have no user information
 522                 $id = $this->getID();
 523                 if ( 0 == $id ) return;
 524
 525                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 526                 if( !is_null( $this->mLastRevision ) ) {
 527                         $this->mUser      = $this->mLastRevision->getUser();
 528                         $this->mUserText  = $this->mLastRevision->getUserText();
 529                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 530                         $this->mComment   = $this->mLastRevision->getComment();
 531                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 532                         $this->mRevIdFetched = $this->mLastRevision->getID();
 533                 }
 534         }
 535
 536         function getTimestamp() {
 537                 // Check if the field has been filled by ParserCache::get()
 538                 if ( !$this->mTimestamp ) {
 539                         $this->loadLastEdit();
 540                 }
 541                 return wfTimestamp(TS_MW, $this->mTimestamp);
 542         }
 543
 544         function getUser() {
 545                 $this->loadLastEdit();
 546                 return $this->mUser;
 547         }
 548
 549         function getUserText() {
 550                 $this->loadLastEdit();
 551                 return $this->mUserText;
 552         }
 553
 554         function getComment() {
 555                 $this->loadLastEdit();
 556                 return $this->mComment;
 557         }
 558
 559         function getMinorEdit() {
 560                 $this->loadLastEdit();
 561                 return $this->mMinorEdit;
 562         }
 563
 564         function getRevIdFetched() {
 565                 $this->loadLastEdit();
 566                 return $this->mRevIdFetched;
 567         }
 568
 569         /**
 570          * @todo Document, fixme $offset never used.
 571          * @param $limit Integer: default 0.
 572          * @param $offset Integer: default 0.
 573          */
 574         function getContributors($limit = 0, $offset = 0) {
 575                 # XXX: this is expensive; cache this info somewhere.
 576
 577                 $contribs = array();
 578                 $dbr = wfGetDB( DB_SLAVE );
 579                 $revTable = $dbr->tableName( 'revision' );
 580                 $userTable = $dbr->tableName( 'user' );
 581                 $user = $this->getUser();
 582                 $pageId = $this->getId();
 583
 584                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 585                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 586                         WHERE rev_page = $pageId
 587                         AND rev_user != $user
 588                         GROUP BY rev_user, rev_user_text, user_real_name
 589                         ORDER BY timestamp DESC";
 590
 591                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 592                 $sql .= ' '. $this->getSelectOptions();
 593
 594                 $res = $dbr->query($sql, __METHOD__);
 595
 596                 while ( $line = $dbr->fetchObject( $res ) ) {
 597                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 598                 }
 599
 600                 $dbr->freeResult($res);
 601                 return $contribs;
 602         }
 603
 604         /**
 605          * This is the default action of the script: just view the page of
 606          * the given title.
 607         */
 608         function view() {
 609                 global $wgUser, $wgOut, $wgRequest, $wgContLang;
 610                 global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
 611                 global $wgUseTrackbacks, $wgNamespaceRobotPolicies, $wgArticleRobotPolicies;
 612                 $sk = $wgUser->getSkin();
 613
 614                 wfProfileIn( __METHOD__ );
 615
 616                 $parserCache =& ParserCache::singleton();
 617                 $ns = $this->mTitle->getNamespace(); # shortcut
 618
 619                 # Get variables from query string
 620                 $oldid = $this->getOldID();
 621
 622                 # getOldID may want us to redirect somewhere else
 623                 if ( $this->mRedirectUrl ) {
 624                         $wgOut->redirect( $this->mRedirectUrl );
 625                         wfProfileOut( __METHOD__ );
 626                         return;
 627                 }
 628
 629                 $diff = $wgRequest->getVal( 'diff' );
 630                 $rcid = $wgRequest->getVal( 'rcid' );
 631                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 632                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 633
 634                 $wgOut->setArticleFlag( true );
 635
 636                 # Discourage indexing of printable versions, but encourage following
 637                 if( $wgOut->isPrintable() ) {
 638                         $policy = 'noindex,follow';
 639                 } elseif ( isset( $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()] ) ) {
 640                         $policy = $wgArticleRobotPolicies[$this->mTitle->getPrefixedText()];
 641                 } elseif( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 642                         # Honour customised robot policies for this namespace
 643                         $policy = $wgNamespaceRobotPolicies[$ns];
 644                 } else {
 645                         # Default to encourage indexing and following links
 646                         $policy = 'index,follow';
 647                 }
 648                 $wgOut->setRobotPolicy( $policy );
 649
 650                 # If we got diff and oldid in the query, we want to see a
 651                 # diff page instead of the article.
 652
 653                 if ( !is_null( $diff ) ) {
 654                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 655
 656                         $de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
 657                         // DifferenceEngine directly fetched the revision:
 658                         $this->mRevIdFetched = $de->mNewid;
 659                         $de->showDiffPage( $diffOnly );
 660
 661                         // Needed to get the page's current revision
 662                         $this->loadPageData();
 663                         if( $diff == 0 || $diff == $this->mLatest ) {
 664                                 # Run view updates for current revision only
 665                                 $this->viewUpdates();
 666                         }
 667                         wfProfileOut( __METHOD__ );
 668                         return;
 669                 }
 670
 671                 if ( empty( $oldid ) && $this->checkTouched() ) {
 672                         $wgOut->setETag($parserCache->getETag($this, $wgUser));
 673
 674                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 675                                 wfProfileOut( __METHOD__ );
 676                                 return;
 677                         } else if ( $this->tryFileCache() ) {
 678                                 # tell wgOut that output is taken care of
 679                                 $wgOut->disable();
 680                                 $this->viewUpdates();
 681                                 wfProfileOut( __METHOD__ );
 682                                 return;
 683                         }
 684                 }
 685
 686                 # Should the parser cache be used?
 687                 $pcache = $wgEnableParserCache &&
 688                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 689                         $this->exists() &&
 690                         empty( $oldid );
 691                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 692                 if ( $wgUser->getOption( 'stubthreshold' ) ) {
 693                         wfIncrStats( 'pcache_miss_stub' );
 694                 }
 695
 696                 $wasRedirected = false;
 697                 if ( isset( $this->mRedirectedFrom ) ) {
 698                         // This is an internally redirected page view.
 699                         // We'll need a backlink to the source page for navigation.
 700                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 701                                 $sk = $wgUser->getSkin();
 702                                 $redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
 703                                 $s = wfMsg( 'redirectedfrom', $redir );
 704                                 $wgOut->setSubtitle( $s );
 705
 706                                 // Set the fragment if one was specified in the redirect
 707                                 if ( strval( $this->mTitle->getFragment() ) != '' ) {
 708                                         $fragment = Xml::escapeJsString( $this->mTitle->getFragmentForURL() );
 709                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 710                                 }
 711                                 $wasRedirected = true;
 712                         }
 713                 } elseif ( !empty( $rdfrom ) ) {
 714                         // This is an externally redirected view, from some other wiki.
 715                         // If it was reported from a trusted site, supply a backlink.
 716                         global $wgRedirectSources;
 717                         if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 718                                 $sk = $wgUser->getSkin();
 719                                 $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 720                                 $s = wfMsg( 'redirectedfrom', $redir );
 721                                 $wgOut->setSubtitle( $s );
 722                                 $wasRedirected = true;
 723                         }
 724                 }
 725
 726                 $outputDone = false;
 727                 wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$pcache ) );
 728                 if ( $pcache ) {
 729                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 730                                 // Ensure that UI elements requiring revision ID have
 731                                 // the correct version information.
 732                                 $wgOut->setRevisionId( $this->mLatest );
 733                                 $outputDone = true;
 734                         }
 735                 }
 736                 if ( !$outputDone ) {
 737                         $text = $this->getContent();
 738                         if ( $text === false ) {
 739                                 # Failed to load, replace text with error message
 740                                 $t = $this->mTitle->getPrefixedText();
 741                                 if( $oldid ) {
 742                                         $t .= ',oldid='.$oldid;
 743                                         $text = wfMsg( 'missingarticle', $t );
 744                                 } else {
 745                                         $text = wfMsg( 'noarticletext', $t );
 746                                 }
 747                         }
 748
 749                         # Another whitelist check in case oldid is altering the title
 750                         if ( !$this->mTitle->userCanRead() ) {
 751                                 $wgOut->loginToUse();
 752                                 $wgOut->output();
 753                                 exit;
 754                         }
 755
 756                         # We're looking at an old revision
 757
 758                         if ( !empty( $oldid ) ) {
 759                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 760                                 if( is_null( $this->mRevision ) ) {
 761                                         // FIXME: This would be a nice place to load the 'no such page' text.
 762                                 } else {
 763                                         $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 764                                         if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 765                                                 if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 766                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
 767                                                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 768                                                         return;
 769                                                 } else {
 770                                                         $wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
 771                                                         // and we are allowed to see...
 772                                                 }
 773                                         }
 774                                 }
 775
 776                         }
 777                 }
 778                 if( !$outputDone ) {
 779                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 780                         # wrap user css and user js in pre and don't parse
 781                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 782                         if (
 783                                 $ns == NS_USER &&
 784                                 preg_match('!/[\w]+\.(css|js)$!', $this->mTitle->getDBkey(), $matches)
 785                         ) {
 786                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 787                                 $wgOut->addHTML( "<pre class=\"mw-user-{$matches[1]}\" dir=\"ltr\">".htmlspecialchars($this->mContent)."\n</pre>" );
 788                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 789                                 # Display redirect
 790                                 $imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
 791                                 $imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
 792                                 # Don't overwrite the subtitle if this was an old revision
 793                                 if( !$wasRedirected && $this->isCurrent() ) {
 794                                         $wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
 795                                 }
 796                                 $link = $sk->makeLinkObj( $rt, $rt->getFullText() );
 797
 798                                 $wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT " />' .
 799                                   '<span class="redirectText">'.$link.'</span>' );
 800
 801                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 802                                 $wgOut->addParserOutputNoText( $parseout );
 803                         } else if ( $pcache ) {
 804                                 # Display content and save to parser cache
 805                                 $this->outputWikiText( $text );
 806                         } else {
 807                                 # Display content, don't attempt to save to parser cache
 808                                 # Don't show section-edit links on old revisions... this way lies madness.
 809                                 if( !$this->isCurrent() ) {
 810                                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 811                                 }
 812                                 # Display content and don't save to parser cache
 813                                 # With timing hack -- TS 2006-07-26
 814                                 $time = -wfTime();
 815                                 $this->outputWikiText( $text, false );
 816                                 $time += wfTime();
 817
 818                                 # Timing hack
 819                                 if ( $time > 3 ) {
 820                                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
 821                                                 $this->mTitle->getPrefixedDBkey()));
 822                                 }
 823
 824                                 if( !$this->isCurrent() ) {
 825                                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 826                                 }
 827
 828                         }
 829                 }
 830                 /* title may have been set from the cache */
 831                 $t = $wgOut->getPageTitle();
 832                 if( empty( $t ) ) {
 833                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 834                 }
 835
 836                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 837                 if( $ns == NS_USER_TALK &&
 838                         User::isIP( $this->mTitle->getText() ) ) {
 839                         $wgOut->addWikiText( wfMsg('anontalkpagetext') );
 840                 }
 841
 842                 # If we have been passed an &rcid= parameter, we want to give the user a
 843                 # chance to mark this new article as patrolled.
 844                 if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
 845                         $wgOut->addHTML(
 846                                 "<div class='patrollink'>" .
 847                                         wfMsgHtml( 'markaspatrolledlink',
 848                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsgHtml('markaspatrolledtext'),
 849                                                 "action=markpatrolled&rcid=$rcid" )
 850                                         ) .
 851                                 '</div>'
 852                          );
 853                 }
 854
 855                 # Trackbacks
 856                 if ($wgUseTrackbacks)
 857                         $this->addTrackbacks();
 858
 859                 $this->viewUpdates();
 860                 wfProfileOut( __METHOD__ );
 861         }
 862
 863         function addTrackbacks() {
 864                 global $wgOut, $wgUser;
 865
 866                 $dbr = wfGetDB(DB_SLAVE);
 867                 $tbs = $dbr->select(
 868                                 /* FROM   */ 'trackbacks',
 869                                 /* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
 870                                 /* WHERE  */ array('tb_page' => $this->getID())
 871                 );
 872
 873                 if (!$dbr->numrows($tbs))
 874                         return;
 875
 876                 $tbtext = "";
 877                 while ($o = $dbr->fetchObject($tbs)) {
 878                         $rmvtxt = "";
 879                         if ($wgUser->isAllowed( 'trackback' )) {
 880                                 $delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
 881                                                 . $o->tb_id . "&token=" . urlencode( $wgUser->editToken() ) );
 882                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
 883                         }
 884                         $tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
 885                                         $o->tb_title,
 886                                         $o->tb_url,
 887                                         $o->tb_ex,
 888                                         $o->tb_name,
 889                                         $rmvtxt);
 890                 }
 891                 $wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
 892         }
 893
 894         function deletetrackback() {
 895                 global $wgUser, $wgRequest, $wgOut, $wgTitle;
 896
 897                 if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
 898                         $wgOut->addWikitext(wfMsg('sessionfailure'));
 899                         return;
 900                 }
 901
 902                 if ((!$wgUser->isAllowed('delete'))) {
 903                         $wgOut->permissionRequired( 'delete' );
 904                         return;
 905                 }
 906
 907                 if (wfReadOnly()) {
 908                         $wgOut->readOnlyPage();
 909                         return;
 910                 }
 911
 912                 $db = wfGetDB(DB_MASTER);
 913                 $db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
 914                 $wgTitle->invalidateCache();
 915                 $wgOut->addWikiText(wfMsg('trackbackdeleteok'));
 916         }
 917
 918         function render() {
 919                 global $wgOut;
 920
 921                 $wgOut->setArticleBodyOnly(true);
 922                 $this->view();
 923         }
 924
 925         /**
 926          * Handle action=purge
 927          */
 928         function purge() {
 929                 global $wgUser, $wgRequest, $wgOut;
 930
 931                 if ( $wgUser->isAllowed( 'purge' ) || $wgRequest->wasPosted() ) {
 932                         if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
 933                                 $this->doPurge();
 934                         }
 935                 } else {
 936                         $msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
 937                         $action = $this->mTitle->escapeLocalURL( 'action=purge' );
 938                         $button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
 939                         $msg = str_replace( '$1',
 940                                 "<form method=\"post\" action=\"$action\">\n" .
 941                                 "<input type=\"submit\" name=\"submit\" value=\"$button\" />\n" .
 942                                 "</form>\n", $msg );
 943
 944                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 945                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 946                         $wgOut->addHTML( $msg );
 947                 }
 948         }
 949
 950         /**
 951          * Perform the actions of a page purging
 952          */
 953         function doPurge() {
 954                 global $wgUseSquid;
 955                 // Invalidate the cache
 956                 $this->mTitle->invalidateCache();
 957
 958                 if ( $wgUseSquid ) {
 959                         // Commit the transaction before the purge is sent
 960                         $dbw = wfGetDB( DB_MASTER );
 961                         $dbw->immediateCommit();
 962
 963                         // Send purge
 964                         $update = SquidUpdate::newSimplePurge( $this->mTitle );
 965                         $update->doUpdate();
 966                 }
 967                 $this->view();
 968         }
 969
 970         /**
 971          * Insert a new empty page record for this article.
 972          * This *must* be followed up by creating a revision
 973          * and running $this->updateToLatest( $rev_id );
 974          * or else the record will be left in a funky state.
 975          * Best if all done inside a transaction.
 976          *
 977          * @param Database $dbw
 978          * @return int     The newly created page_id key
 979          * @private
 980          */
 981         function insertOn( $dbw ) {
 982                 wfProfileIn( __METHOD__ );
 983
 984                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 985                 $dbw->insert( 'page', array(
 986                         'page_id'           => $page_id,
 987                         'page_namespace'    => $this->mTitle->getNamespace(),
 988                         'page_title'        => $this->mTitle->getDBkey(),
 989                         'page_counter'      => 0,
 990                         'page_restrictions' => '',
 991                         'page_is_redirect'  => 0, # Will set this shortly...
 992                         'page_is_new'       => 1,
 993                         'page_random'       => wfRandom(),
 994                         'page_touched'      => $dbw->timestamp(),
 995                         'page_latest'       => 0, # Fill this in shortly...
 996                         'page_len'          => 0, # Fill this in shortly...
 997                 ), __METHOD__ );
 998                 $newid = $dbw->insertId();
 999
1000                 $this->mTitle->resetArticleId( $newid );
1001
1002                 wfProfileOut( __METHOD__ );
1003                 return $newid;
1004         }
1005
1006         /**
1007          * Update the page record to point to a newly saved revision.
1008          *
1009          * @param Database $dbw
1010          * @param Revision $revision For ID number, and text used to set
1011                                      length and redirect status fields
1012          * @param int $lastRevision If given, will not overwrite the page field
1013          *                          when different from the currently set value.
1014          *                          Giving 0 indicates the new page flag should
1015          *                          be set on.
1016          * @param bool $lastRevIsRedirect If given, will optimize adding and
1017          *                                                      removing rows in redirect table.
1018          * @return bool true on success, false on failure
1019          * @private
1020          */
1021         function updateRevisionOn( &$dbw, $revision, $lastRevision = null, $lastRevIsRedirect = null ) {
1022                 wfProfileIn( __METHOD__ );
1023
1024                 $text = $revision->getText();
1025                 $rt = Title::newFromRedirect( $text );
1026
1027                 $conditions = array( 'page_id' => $this->getId() );
1028                 if( !is_null( $lastRevision ) ) {
1029                         # An extra check against threads stepping on each other
1030                         $conditions['page_latest'] = $lastRevision;
1031                 }
1032
1033                 $dbw->update( 'page',
1034                         array( /* SET */
1035                                 'page_latest'      => $revision->getId(),
1036                                 'page_touched'     => $dbw->timestamp(),
1037                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
1038                                 'page_is_redirect' => $rt !== NULL ? 1 : 0,
1039                                 'page_len'         => strlen( $text ),
1040                         ),
1041                         $conditions,
1042                         __METHOD__ );
1043
1044                 $result = $dbw->affectedRows() != 0;
1045
1046                 if ($result) {
1047                         // FIXME: Should the result from updateRedirectOn() be returned instead?
1048                         $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
1049                 }
1050
1051                 wfProfileOut( __METHOD__ );
1052                 return $result;
1053         }
1054
1055         /**
1056          * Add row to the redirect table if this is a redirect, remove otherwise.
1057          *
1058          * @param Database $dbw
1059          * @param $redirectTitle a title object pointing to the redirect target,
1060          *                                                      or NULL if this is not a redirect
1061          * @param bool $lastRevIsRedirect If given, will optimize adding and
1062          *                                                      removing rows in redirect table.
1063          * @return bool true on success, false on failure
1064          * @private
1065          */
1066         function updateRedirectOn( &$dbw, $redirectTitle, $lastRevIsRedirect = null ) {
1067
1068                 // Always update redirects (target link might have changed)
1069                 // Update/Insert if we don't know if the last revision was a redirect or not
1070                 // Delete if changing from redirect to non-redirect
1071                 $isRedirect = !is_null($redirectTitle);
1072                 if ($isRedirect || is_null($lastRevIsRedirect) || $lastRevIsRedirect !== $isRedirect) {
1073
1074                         wfProfileIn( __METHOD__ );
1075
1076                         if ($isRedirect) {
1077
1078                                 // This title is a redirect, Add/Update row in the redirect table
1079                                 $set = array( /* SET */
1080                                         'rd_namespace' => $redirectTitle->getNamespace(),
1081                                         'rd_title'     => $redirectTitle->getDBkey(),
1082                                         'rd_from'      => $this->getId(),
1083                                 );
1084
1085                                 $dbw->replace( 'redirect', array( 'rd_from' ), $set, __METHOD__ );
1086                         } else {
1087                                 // This is not a redirect, remove row from redirect table
1088                                 $where = array( 'rd_from' => $this->getId() );
1089                                 $dbw->delete( 'redirect', $where, __METHOD__);
1090                         }
1091
1092                         wfProfileOut( __METHOD__ );
1093                         return ( $dbw->affectedRows() != 0 );
1094                 }
1095
1096                 return true;
1097         }
1098
1099         /**
1100          * If the given revision is newer than the currently set page_latest,
1101          * update the page record. Otherwise, do nothing.
1102          *
1103          * @param Database $dbw
1104          * @param Revision $revision
1105          */
1106         function updateIfNewerOn( &$dbw, $revision ) {
1107                 wfProfileIn( __METHOD__ );
1108
1109                 $row = $dbw->selectRow(
1110                         array( 'revision', 'page' ),
1111                         array( 'rev_id', 'rev_timestamp', 'page_is_redirect' ),
1112                         array(
1113                                 'page_id' => $this->getId(),
1114                                 'page_latest=rev_id' ),
1115                         __METHOD__ );
1116                 if( $row ) {
1117                         if( wfTimestamp(TS_MW, $row->rev_timestamp) >= $revision->getTimestamp() ) {
1118                                 wfProfileOut( __METHOD__ );
1119                                 return false;
1120                         }
1121                         $prev = $row->rev_id;
1122                         $lastRevIsRedirect = (bool)$row->page_is_redirect;
1123                 } else {
1124                         # No or missing previous revision; mark the page as new
1125                         $prev = 0;
1126                         $lastRevIsRedirect = null;
1127                 }
1128
1129                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev, $lastRevIsRedirect );
1130                 wfProfileOut( __METHOD__ );
1131                 return $ret;
1132         }
1133
1134         /**
1135          * @return string Complete article text, or null if error
1136          */
1137         function replaceSection($section, $text, $summary = '', $edittime = NULL) {
1138                 wfProfileIn( __METHOD__ );
1139
1140                 if( $section == '' ) {
1141                         // Whole-page edit; let the text through unmolested.
1142                 } else {
1143                         if( is_null( $edittime ) ) {
1144                                 $rev = Revision::newFromTitle( $this->mTitle );
1145                         } else {
1146                                 $dbw = wfGetDB( DB_MASTER );
1147                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1148                         }
1149                         if( is_null( $rev ) ) {
1150                                 wfDebug( "Article::replaceSection asked for bogus section (page: " .
1151                                         $this->getId() . "; section: $section; edittime: $edittime)\n" );
1152                                 return null;
1153                         }
1154                         $oldtext = $rev->getText();
1155
1156                         if( $section == 'new' ) {
1157                                 # Inserting a new section
1158                                 $subject = $summary ? "== {$summary} ==\n\n" : '';
1159                                 $text = strlen( trim( $oldtext ) ) > 0
1160                                                 ? "{$oldtext}\n\n{$subject}{$text}"
1161                                                 : "{$subject}{$text}";
1162                         } else {
1163                                 # Replacing an existing section; roll out the big guns
1164                                 global $wgParser;
1165                                 $text = $wgParser->replaceSection( $oldtext, $section, $text );
1166                         }
1167
1168                 }
1169
1170                 wfProfileOut( __METHOD__ );
1171                 return $text;
1172         }
1173
1174         /**
1175          * @deprecated use Article::doEdit()
1176          */
1177         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
1178                 $flags = EDIT_NEW | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1179                         ( $isminor ? EDIT_MINOR : 0 ) |
1180                         ( $suppressRC ? EDIT_SUPPRESS_RC : 0 );
1181
1182                 # If this is a comment, add the summary as headline
1183                 if ( $comment && $summary != "" ) {
1184                         $text = "== {$summary} ==\n\n".$text;
1185                 }
1186
1187                 $this->doEdit( $text, $summary, $flags );
1188
1189                 $dbw = wfGetDB( DB_MASTER );
1190                 if ($watchthis) {
1191                         if (!$this->mTitle->userIsWatching()) {
1192                                 $dbw->begin();
1193                                 $this->doWatch();
1194                                 $dbw->commit();
1195                         }
1196                 } else {
1197                         if ( $this->mTitle->userIsWatching() ) {
1198                                 $dbw->begin();
1199                                 $this->doUnwatch();
1200                                 $dbw->commit();
1201                         }
1202                 }
1203                 $this->doRedirect( $this->isRedirect( $text ) );
1204         }
1205
1206         /**
1207          * @deprecated use Article::doEdit()
1208          */
1209         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1210                 $flags = EDIT_UPDATE | EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1211                         ( $minor ? EDIT_MINOR : 0 ) |
1212                         ( $forceBot ? EDIT_FORCE_BOT : 0 );
1213
1214                 $good = $this->doEdit( $text, $summary, $flags );
1215                 if ( $good ) {
1216                         $dbw = wfGetDB( DB_MASTER );
1217                         if ($watchthis) {
1218                                 if (!$this->mTitle->userIsWatching()) {
1219                                         $dbw->begin();
1220                                         $this->doWatch();
1221                                         $dbw->commit();
1222                                 }
1223                         } else {
1224                                 if ( $this->mTitle->userIsWatching() ) {
1225                                         $dbw->begin();
1226                                         $this->doUnwatch();
1227                                         $dbw->commit();
1228                                 }
1229                         }
1230
1231                         $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1232                 }
1233                 return $good;
1234         }
1235
1236         /**
1237          * Article::doEdit()
1238          *
1239          * Change an existing article or create a new article. Updates RC and all necessary caches,
1240          * optionally via the deferred update array.
1241          *
1242          * $wgUser must be set before calling this function.
1243          *
1244          * @param string $text New text
1245          * @param string $summary Edit summary
1246          * @param integer $flags bitfield:
1247          *      EDIT_NEW
1248          *          Article is known or assumed to be non-existent, create a new one
1249          *      EDIT_UPDATE
1250          *          Article is known or assumed to be pre-existing, update it
1251          *      EDIT_MINOR
1252          *          Mark this edit minor, if the user is allowed to do so
1253          *      EDIT_SUPPRESS_RC
1254          *          Do not log the change in recentchanges
1255          *      EDIT_FORCE_BOT
1256          *          Mark the edit a "bot" edit regardless of user rights
1257          *      EDIT_DEFER_UPDATES
1258          *          Defer some of the updates until the end of index.php
1259          *      EDIT_AUTOSUMMARY
1260          *          Fill in blank summaries with generated text where possible
1261          *
1262          * If neither EDIT_NEW nor EDIT_UPDATE is specified, the status of the article will be detected.
1263          * If EDIT_UPDATE is specified and the article doesn't exist, the function will return false. If
1264          * EDIT_NEW is specified and the article does exist, a duplicate key error will cause an exception
1265          * to be thrown from the Database. These two conditions are also possible with auto-detection due
1266          * to MediaWiki's performance-optimised locking strategy.
1267          *
1268          * @return bool success
1269          */
1270         function doEdit( $text, $summary, $flags = 0 ) {
1271                 global $wgUser, $wgDBtransactions;
1272
1273                 wfProfileIn( __METHOD__ );
1274                 $good = true;
1275
1276                 if ( !($flags & EDIT_NEW) && !($flags & EDIT_UPDATE) ) {
1277                         $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
1278                         if ( $aid ) {
1279                                 $flags |= EDIT_UPDATE;
1280                         } else {
1281                                 $flags |= EDIT_NEW;
1282                         }
1283                 }
1284
1285                 if( !wfRunHooks( 'ArticleSave', array( &$this, &$wgUser, &$text,
1286                         &$summary, $flags & EDIT_MINOR,
1287                         null, null, &$flags ) ) )
1288                 {
1289                         wfDebug( __METHOD__ . ": ArticleSave hook aborted save!\n" );
1290                         wfProfileOut( __METHOD__ );
1291                         return false;
1292                 }
1293
1294                 # Silently ignore EDIT_MINOR if not allowed
1295                 $isminor = ( $flags & EDIT_MINOR ) && $wgUser->isAllowed('minoredit');
1296                 $bot = $wgUser->isAllowed( 'bot' ) || ( $flags & EDIT_FORCE_BOT );
1297
1298                 $oldtext = $this->getContent();
1299                 $oldsize = strlen( $oldtext );
1300
1301                 # Provide autosummaries if one is not provided.
1302                 if ($flags & EDIT_AUTOSUMMARY && $summary == '')
1303                         $summary = $this->getAutosummary( $oldtext, $text, $flags );
1304
1305                 $text = $this->preSaveTransform( $text );
1306                 $newsize = strlen( $text );
1307
1308                 $dbw = wfGetDB( DB_MASTER );
1309                 $now = wfTimestampNow();
1310
1311                 if ( $flags & EDIT_UPDATE ) {
1312                         # Update article, but only if changed.
1313
1314                         # Make sure the revision is either completely inserted or not inserted at all
1315                         if( !$wgDBtransactions ) {
1316                                 $userAbort = ignore_user_abort( true );
1317                         }
1318
1319                         $lastRevision = 0;
1320                         $revisionId = 0;
1321
1322                         if ( 0 != strcmp( $text, $oldtext ) ) {
1323                                 $this->mGoodAdjustment = (int)$this->isCountable( $text )
1324                                   - (int)$this->isCountable( $oldtext );
1325                                 $this->mTotalAdjustment = 0;
1326
1327                                 $lastRevision = $dbw->selectField(
1328                                         'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1329
1330                                 if ( !$lastRevision ) {
1331                                         # Article gone missing
1332                                         wfDebug( __METHOD__.": EDIT_UPDATE specified but article doesn't exist\n" );
1333                                         wfProfileOut( __METHOD__ );
1334                                         return false;
1335                                 }
1336
1337                                 $revision = new Revision( array(
1338                                         'page'       => $this->getId(),
1339                                         'comment'    => $summary,
1340                                         'minor_edit' => $isminor,
1341                                         'text'       => $text
1342                                         ) );
1343
1344                                 $dbw->begin();
1345                                 $revisionId = $revision->insertOn( $dbw );
1346
1347                                 # Update page
1348                                 $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1349
1350                                 if( !$ok ) {
1351                                         /* Belated edit conflict! Run away!! */
1352                                         $good = false;
1353                                         $dbw->rollback();
1354                                 } else {
1355                                         # Update recentchanges
1356                                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1357                                                 $rcid = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1358                                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1359                                                         $revisionId );
1360
1361                                                 # Mark as patrolled if the user can do so
1362                                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1363                                                         RecentChange::markPatrolled( $rcid );
1364                                                         PatrolLog::record( $rcid, true );
1365                                                 }
1366                                         }
1367                                         $wgUser->incEditCount();
1368                                         $dbw->commit();
1369                                 }
1370                         } else {
1371                                 // Keep the same revision ID, but do some updates on it
1372                                 $revisionId = $this->getRevIdFetched();
1373                                 // Update page_touched, this is usually implicit in the page update
1374                                 // Other cache updates are done in onArticleEdit()
1375                                 $this->mTitle->invalidateCache();
1376                         }
1377
1378                         if( !$wgDBtransactions ) {
1379                                 ignore_user_abort( $userAbort );
1380                         }
1381
1382                         if ( $good ) {
1383                                 # Invalidate cache of this article and all pages using this article
1384                                 # as a template. Partly deferred.
1385                                 Article::onArticleEdit( $this->mTitle );
1386
1387                                 # Update links tables, site stats, etc.
1388                                 $changed = ( strcmp( $oldtext, $text ) != 0 );
1389                                 $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, $changed );
1390                         }
1391                 } else {
1392                         # Create new article
1393
1394                         # Set statistics members
1395                         # We work out if it's countable after PST to avoid counter drift
1396                         # when articles are created with {{subst:}}
1397                         $this->mGoodAdjustment = (int)$this->isCountable( $text );
1398                         $this->mTotalAdjustment = 1;
1399
1400                         $dbw->begin();
1401
1402                         # Add the page record; stake our claim on this title!
1403                         # This will fail with a database query exception if the article already exists
1404                         $newid = $this->insertOn( $dbw );
1405
1406                         # Save the revision text...
1407                         $revision = new Revision( array(
1408                                 'page'       => $newid,
1409                                 'comment'    => $summary,
1410                                 'minor_edit' => $isminor,
1411                                 'text'       => $text
1412                                 ) );
1413                         $revisionId = $revision->insertOn( $dbw );
1414
1415                         $this->mTitle->resetArticleID( $newid );
1416
1417                         # Update the page record with revision data
1418                         $this->updateRevisionOn( $dbw, $revision, 0 );
1419
1420                         if( !( $flags & EDIT_SUPPRESS_RC ) ) {
1421                                 $rcid = RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, $bot,
1422                                   '', strlen( $text ), $revisionId );
1423                                 # Mark as patrolled if the user can
1424                                 if( $GLOBALS['wgUseRCPatrol'] && $wgUser->isAllowed( 'autopatrol' ) ) {
1425                                         RecentChange::markPatrolled( $rcid );
1426                                         PatrolLog::record( $rcid, true );
1427                                 }
1428                         }
1429                         $wgUser->incEditCount();
1430                         $dbw->commit();
1431
1432                         # Update links, etc.
1433                         $this->editUpdates( $text, $summary, $isminor, $now, $revisionId, true );
1434
1435                         # Clear caches
1436                         Article::onArticleCreate( $this->mTitle );
1437
1438                         wfRunHooks( 'ArticleInsertComplete', array( &$this, &$wgUser, $text,
1439                                 $summary, $flags & EDIT_MINOR,
1440                                 null, null, &$flags ) );
1441                 }
1442
1443                 if ( $good && !( $flags & EDIT_DEFER_UPDATES ) ) {
1444                         wfDoUpdates();
1445                 }
1446
1447                 wfRunHooks( 'ArticleSaveComplete',
1448                         array( &$this, &$wgUser, $text,
1449                         $summary, $flags & EDIT_MINOR,
1450                         null, null, &$flags ) );
1451
1452                 wfProfileOut( __METHOD__ );
1453                 return $good;
1454         }
1455
1456         /**
1457          * @deprecated wrapper for doRedirect
1458          */
1459         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1460                 $this->doRedirect( $this->isRedirect( $text ), $sectionanchor );
1461         }
1462
1463         /**
1464          * Output a redirect back to the article.
1465          * This is typically used after an edit.
1466          *
1467          * @param boolean $noRedir Add redirect=no
1468          * @param string $sectionAnchor section to redirect to, including "#"
1469          */
1470         function doRedirect( $noRedir = false, $sectionAnchor = '' ) {
1471                 global $wgOut;
1472                 if ( $noRedir ) {
1473                         $query = 'redirect=no';
1474                 } else {
1475                         $query = '';
1476                 }
1477                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $sectionAnchor );
1478         }
1479
1480         /**
1481          * Mark this particular edit as patrolled
1482          */
1483         function markpatrolled() {
1484                 global $wgOut, $wgRequest, $wgUseRCPatrol, $wgUser;
1485                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1486
1487                 # Check RC patrol config. option
1488                 if( !$wgUseRCPatrol ) {
1489                         $wgOut->errorPage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1490                         return;
1491                 }
1492
1493                 # Check permissions
1494                 if( !$wgUser->isAllowed( 'patrol' ) ) {
1495                         $wgOut->permissionRequired( 'patrol' );
1496                         return;
1497                 }
1498
1499                 # If we haven't been given an rc_id value, we can't do anything
1500                 $rcid = $wgRequest->getVal( 'rcid' );
1501                 if( !$rcid ) {
1502                         $wgOut->errorPage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1503                         return;
1504                 }
1505
1506                 # Handle the 'MarkPatrolled' hook
1507                 if( !wfRunHooks( 'MarkPatrolled', array( $rcid, &$wgUser, false ) ) ) {
1508                         return;
1509                 }
1510
1511                 $return = SpecialPage::getTitleFor( 'Recentchanges' );
1512                 # If it's left up to us, check that the user is allowed to patrol this edit
1513                 # If the user has the "autopatrol" right, then we'll assume there are no
1514                 # other conditions stopping them doing so
1515                 if( !$wgUser->isAllowed( 'autopatrol' ) ) {
1516                         $rc = RecentChange::newFromId( $rcid );
1517                         # Graceful error handling, as we've done before here...
1518                         # (If the recent change doesn't exist, then it doesn't matter whether
1519                         # the user is allowed to patrol it or not; nothing is going to happen
1520                         if( is_object( $rc ) && $wgUser->getName() == $rc->getAttribute( 'rc_user_text' ) ) {
1521                                 # The user made this edit, and can't patrol it
1522                                 # Tell them so, and then back off
1523                                 $wgOut->setPageTitle( wfMsg( 'markedaspatrollederror' ) );
1524                                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrollederror-noautopatrol' ) );
1525                                 $wgOut->returnToMain( false, $return );
1526                                 return;
1527                         }
1528                 }
1529
1530                 # Mark the edit as patrolled
1531                 RecentChange::markPatrolled( $rcid );
1532                 PatrolLog::record( $rcid );
1533                 wfRunHooks( 'MarkPatrolledComplete', array( &$rcid, &$wgUser, false ) );
1534
1535                 # Inform the user
1536                 $wgOut->setPageTitle( wfMsg( 'markedaspatrolled' ) );
1537                 $wgOut->addWikiText( wfMsgNoTrans( 'markedaspatrolledtext' ) );
1538                 $wgOut->returnToMain( false, $return );
1539         }
1540
1541         /**
1542          * User-interface handler for the "watch" action
1543          */
1544
1545         function watch() {
1546
1547                 global $wgUser, $wgOut;
1548
1549                 if ( $wgUser->isAnon() ) {
1550                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1551                         return;
1552                 }
1553                 if ( wfReadOnly() ) {
1554                         $wgOut->readOnlyPage();
1555                         return;
1556                 }
1557
1558                 if( $this->doWatch() ) {
1559                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1560                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1561
1562                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1563                         $text = wfMsg( 'addedwatchtext', $link );
1564                         $wgOut->addWikiText( $text );
1565                 }
1566
1567                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1568         }
1569
1570         /**
1571          * Add this page to $wgUser's watchlist
1572          * @return bool true on successful watch operation
1573          */
1574         function doWatch() {
1575                 global $wgUser;
1576                 if( $wgUser->isAnon() ) {
1577                         return false;
1578                 }
1579
1580                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1581                         $wgUser->addWatch( $this->mTitle );
1582
1583                         return wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1584                 }
1585
1586                 return false;
1587         }
1588
1589         /**
1590          * User interface handler for the "unwatch" action.
1591          */
1592         function unwatch() {
1593
1594                 global $wgUser, $wgOut;
1595
1596                 if ( $wgUser->isAnon() ) {
1597                         $wgOut->showErrorPage( 'watchnologin', 'watchnologintext' );
1598                         return;
1599                 }
1600                 if ( wfReadOnly() ) {
1601                         $wgOut->readOnlyPage();
1602                         return;
1603                 }
1604
1605                 if( $this->doUnwatch() ) {
1606                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1607                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
1608
1609                         $link = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
1610                         $text = wfMsg( 'removedwatchtext', $link );
1611                         $wgOut->addWikiText( $text );
1612                 }
1613
1614                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1615         }
1616
1617         /**
1618          * Stop watching a page
1619          * @return bool true on successful unwatch
1620          */
1621         function doUnwatch() {
1622                 global $wgUser;
1623                 if( $wgUser->isAnon() ) {
1624                         return false;
1625                 }
1626
1627                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1628                         $wgUser->removeWatch( $this->mTitle );
1629
1630                         return wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1631                 }
1632
1633                 return false;
1634         }
1635
1636         /**
1637          * action=protect handler
1638          */
1639         function protect() {
1640                 $form = new ProtectionForm( $this );
1641                 $form->execute();
1642         }
1643
1644         /**
1645          * action=unprotect handler (alias)
1646          */
1647         function unprotect() {
1648                 $this->protect();
1649         }
1650
1651         /**
1652          * Update the article's restriction field, and leave a log entry.
1653          *
1654          * @param array $limit set of restriction keys
1655          * @param string $reason
1656          * @return bool true on success
1657          */
1658         function updateRestrictions( $limit = array(), $reason = '', $cascade = 0, $expiry = null ) {
1659                 global $wgUser, $wgRestrictionTypes, $wgContLang;
1660
1661                 $id = $this->mTitle->getArticleID();
1662                 if( !$wgUser->isAllowed( 'protect' ) || wfReadOnly() || $id == 0 ) {
1663                         return false;
1664                 }
1665
1666                 if (!$cascade) {
1667                         $cascade = false;
1668                 }
1669
1670                 // Take this opportunity to purge out expired restrictions
1671                 Title::purgeExpiredRestrictions();
1672
1673                 # FIXME: Same limitations as described in ProtectionForm.php (line 37);
1674                 # we expect a single selection, but the schema allows otherwise.
1675                 $current = array();
1676                 foreach( $wgRestrictionTypes as $action )
1677                         $current[$action] = implode( '', $this->mTitle->getRestrictions( $action ) );
1678
1679                 $current = Article::flattenRestrictions( $current );
1680                 $updated = Article::flattenRestrictions( $limit );
1681
1682                 $changed = ( $current != $updated );
1683                 $changed = $changed || ($this->mTitle->areRestrictionsCascading() != $cascade);
1684                 $changed = $changed || ($this->mTitle->mRestrictionsExpiry != $expiry);
1685                 $protect = ( $updated != '' );
1686
1687                 # If nothing's changed, do nothing
1688                 if( $changed ) {
1689                         global $wgGroupPermissions;
1690                         if( wfRunHooks( 'ArticleProtect', array( &$this, &$wgUser, $limit, $reason ) ) ) {
1691
1692                                 $dbw = wfGetDB( DB_MASTER );
1693
1694                                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1695
1696                                 $expiry_description = '';
1697                                 if ( $encodedExpiry != 'infinity' ) {
1698                                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1699                                 }
1700
1701                                 # Prepare a null revision to be added to the history
1702                                 $modified = $current != '' && $protect;
1703                                 if ( $protect ) {
1704                                         $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
1705                                 } else {
1706                                         $comment_type = 'unprotectedarticle';
1707                                 }
1708                                 $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
1709
1710                                 foreach( $limit as $action => $restrictions ) {
1711                                         # Check if the group level required to edit also can protect pages
1712                                         # Otherwise, people who cannot normally protect can "protect" pages via transclusion
1713                                         $cascade = ( $cascade && isset($wgGroupPermissions[$restrictions]['protect']) && $wgGroupPermissions[$restrictions]['protect'] );
1714                                 }
1715
1716                                 $cascade_description = '';
1717                                 if ($cascade) {
1718                                         $cascade_description = ' ['.wfMsg('protect-summary-cascade').']';
1719                                 }
1720
1721                                 if( $reason )
1722                                         $comment .= ": $reason";
1723                                 if( $protect )
1724                                         $comment .= " [$updated]";
1725                                 if ( $expiry_description && $protect )
1726                                         $comment .= "$expiry_description";
1727                                 if ( $cascade )
1728                                         $comment .= "$cascade_description";
1729
1730                                 $nullRevision = Revision::newNullRevision( $dbw, $id, $comment, true );
1731                                 $nullRevId = $nullRevision->insertOn( $dbw );
1732
1733                                 # Update restrictions table
1734                                 foreach( $limit as $action => $restrictions ) {
1735                                         if ($restrictions != '' ) {
1736                                                 $dbw->replace( 'page_restrictions', array(array('pr_page', 'pr_type')),
1737                                                         array( 'pr_page' => $id, 'pr_type' => $action
1738                                                                 , 'pr_level' => $restrictions, 'pr_cascade' => $cascade ? 1 : 0
1739                                                                 , 'pr_expiry' => $encodedExpiry ), __METHOD__  );
1740                                         } else {
1741                                                 $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
1742                                                         'pr_type' => $action ), __METHOD__ );
1743                                         }
1744                                 }
1745
1746                                 # Update page record
1747                                 $dbw->update( 'page',
1748                                         array( /* SET */
1749                                                 'page_touched' => $dbw->timestamp(),
1750                                                 'page_restrictions' => '',
1751                                                 'page_latest' => $nullRevId
1752                                         ), array( /* WHERE */
1753                                                 'page_id' => $id
1754                                         ), 'Article::protect'
1755                                 );
1756                                 wfRunHooks( 'ArticleProtectComplete', array( &$this, &$wgUser, $limit, $reason ) );
1757
1758                                 # Update the protection log
1759                                 $log = new LogPage( 'protect' );
1760
1761                                 if( $protect ) {
1762                                         $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason . " [$updated]$cascade_description$expiry_description" ) );
1763                                 } else {
1764                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1765                                 }
1766
1767                         } # End hook
1768                 } # End "changed" check
1769
1770                 return true;
1771         }
1772
1773         /**
1774          * Take an array of page restrictions and flatten it to a string
1775          * suitable for insertion into the page_restrictions field.
1776          * @param array $limit
1777          * @return string
1778          * @private
1779          */
1780         function flattenRestrictions( $limit ) {
1781                 if( !is_array( $limit ) ) {
1782                         throw new MWException( 'Article::flattenRestrictions given non-array restriction set' );
1783                 }
1784                 $bits = array();
1785                 ksort( $limit );
1786                 foreach( $limit as $action => $restrictions ) {
1787                         if( $restrictions != '' ) {
1788                                 $bits[] = "$action=$restrictions";
1789                         }
1790                 }
1791                 return implode( ':', $bits );
1792         }
1793
1794         /*
1795          * UI entry point for page deletion
1796          */
1797         function delete() {
1798                 global $wgUser, $wgOut, $wgRequest;
1799                 $confirm = $wgRequest->wasPosted() &&
1800                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1801                 $reason = $wgRequest->getText( 'wpReason' );
1802
1803                 # This code desperately needs to be totally rewritten
1804
1805                 # Check permissions
1806                 if( $wgUser->isAllowed( 'delete' ) ) {
1807                         if( $wgUser->isBlocked( !$confirm ) ) {
1808                                 $wgOut->blockedPage();
1809                                 return;
1810                         }
1811                 } else {
1812                         $wgOut->permissionRequired( 'delete' );
1813                         return;
1814                 }
1815
1816                 if( wfReadOnly() ) {
1817                         $wgOut->readOnlyPage();
1818                         return;
1819                 }
1820
1821                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1822
1823                 # Better double-check that it hasn't been deleted yet!
1824                 $dbw = wfGetDB( DB_MASTER );
1825                 $conds = $this->mTitle->pageCond();
1826                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1827                 if ( $latest === false ) {
1828                         $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
1829                         return;
1830                 }
1831
1832                 if( $confirm ) {
1833                         $this->doDelete( $reason );
1834                         if( $wgRequest->getCheck( 'wpWatch' ) ) {
1835                                 $this->doWatch();
1836                         } elseif( $this->mTitle->userIsWatching() ) {
1837                                 $this->doUnwatch();
1838                         }
1839                         return;
1840                 }
1841
1842                 # determine whether this page has earlier revisions
1843                 # and insert a warning if it does
1844                 $maxRevisions = 20;
1845                 $authors = $this->getLastNAuthors( $maxRevisions, $latest );
1846
1847                 if( count( $authors ) > 1 && !$confirm ) {
1848                         $skin=$wgUser->getSkin();
1849                         $wgOut->addHTML( '<strong>' . wfMsg( 'historywarning' ) . ' ' . $skin->historyLink() . '</strong>' );
1850                 }
1851
1852                 # If a single user is responsible for all revisions, find out who they are
1853                 if ( count( $authors ) == $maxRevisions ) {
1854                         // Query bailed out, too many revisions to find out if they're all the same
1855                         $authorOfAll = false;
1856                 } else {
1857                         $authorOfAll = reset( $authors );
1858                         foreach ( $authors as $author ) {
1859                                 if ( $authorOfAll != $author ) {
1860                                         $authorOfAll = false;
1861                                         break;
1862                                 }
1863                         }
1864                 }
1865                 # Fetch article text
1866                 $rev = Revision::newFromTitle( $this->mTitle );
1867
1868                 if( !is_null( $rev ) ) {
1869                         # if this is a mini-text, we can paste part of it into the deletion reason
1870                         $text = $rev->getText();
1871
1872                         #if this is empty, an earlier revision may contain "useful" text
1873                         $blanked = false;
1874                         if( $text == '' ) {
1875                                 $prev = $rev->getPrevious();
1876                                 if( $prev ) {
1877                                         $text = $prev->getText();
1878                                         $blanked = true;
1879                                 }
1880                         }
1881
1882                         $length = strlen( $text );
1883
1884                         # this should not happen, since it is not possible to store an empty, new
1885                         # page. Let's insert a standard text in case it does, though
1886                         if( $length == 0 && $reason === '' ) {
1887                                 $reason = wfMsgForContent( 'exblank' );
1888                         }
1889
1890                         if( $reason === '' ) {
1891                                 # comment field=255, let's grep the first 150 to have some user
1892                                 # space left
1893                                 global $wgContLang;
1894                                 $text = $wgContLang->truncate( $text, 150, '...' );
1895
1896                                 # let's strip out newlines
1897                                 $text = preg_replace( "/[\n\r]/", '', $text );
1898
1899                                 if( !$blanked ) {
1900                                         if( $authorOfAll === false ) {
1901                                                 $reason = wfMsgForContent( 'excontent', $text );
1902                                         } else {
1903                                                 $reason = wfMsgForContent( 'excontentauthor', $text, $authorOfAll );
1904                                         }
1905                                 } else {
1906                                         $reason = wfMsgForContent( 'exbeforeblank', $text );
1907                                 }
1908                         }
1909                 }
1910
1911                 return $this->confirmDelete( '', $reason );
1912         }
1913
1914         /**
1915          * Get the last N authors
1916          * @param int $num Number of revisions to get
1917          * @param string $revLatest The latest rev_id, selected from the master (optional)
1918          * @return array Array of authors, duplicates not removed
1919          */
1920         function getLastNAuthors( $num, $revLatest = 0 ) {
1921                 wfProfileIn( __METHOD__ );
1922
1923                 // First try the slave
1924                 // If that doesn't have the latest revision, try the master
1925                 $continue = 2;
1926                 $db = wfGetDB( DB_SLAVE );
1927                 do {
1928                         $res = $db->select( array( 'page', 'revision' ),
1929                                 array( 'rev_id', 'rev_user_text' ),
1930                                 array(
1931                                         'page_namespace' => $this->mTitle->getNamespace(),
1932                                         'page_title' => $this->mTitle->getDBkey(),
1933                                         'rev_page = page_id'
1934                                 ), __METHOD__, $this->getSelectOptions( array(
1935                                         'ORDER BY' => 'rev_timestamp DESC',
1936                                         'LIMIT' => $num
1937                                 ) )
1938                         );
1939                         if ( !$res ) {
1940                                 wfProfileOut( __METHOD__ );
1941                                 return array();
1942                         }
1943                         $row = $db->fetchObject( $res );
1944                         if ( $continue == 2 && $revLatest && $row->rev_id != $revLatest ) {
1945                                 $db = wfGetDB( DB_MASTER );
1946                                 $continue--;
1947                         } else {
1948                                 $continue = 0;
1949                         }
1950                 } while ( $continue );
1951
1952                 $authors = array( $row->rev_user_text );
1953                 while ( $row = $db->fetchObject( $res ) ) {
1954                         $authors[] = $row->rev_user_text;
1955                 }
1956                 wfProfileOut( __METHOD__ );
1957                 return $authors;
1958         }
1959
1960         /**
1961          * Output deletion confirmation dialog
1962          */
1963         function confirmDelete( $par, $reason ) {
1964                 global $wgOut, $wgUser;
1965
1966                 wfDebug( "Article::confirmDelete\n" );
1967
1968                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1969                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1970                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1971                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1972
1973                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1974
1975                 $confirm = htmlspecialchars( wfMsg( 'deletepage' ) );
1976                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1977                 $token = htmlspecialchars( $wgUser->editToken() );
1978                 $watch = Xml::checkLabel( wfMsg( 'watchthis' ), 'wpWatch', 'wpWatch', $wgUser->getBoolOption( 'watchdeletion' ) || $this->mTitle->userIsWatching(), array( 'tabindex' => '2' ) );
1979
1980                 $wgOut->addHTML( "
1981 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1982         <table border='0'>
1983                 <tr>
1984                         <td align='right'>
1985                                 <label for='wpReason'>{$delcom}:</label>
1986                         </td>
1987                         <td align='left'>
1988                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" tabindex=\"1\" />
1989                         </td>
1990                 </tr>
1991                 <tr>
1992                         <td>&nbsp;</td>
1993                         <td>$watch</td>
1994                 </tr>
1995                 <tr>
1996                         <td>&nbsp;</td>
1997                         <td>
1998                                 <input type='submit' name='wpConfirmB' id='wpConfirmB' value=\"{$confirm}\" tabindex=\"3\" />
1999                         </td>
2000                 </tr>
2001         </table>
2002         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
2003 </form>\n" );
2004
2005                 $wgOut->returnToMain( false );
2006
2007                 $this->showLogExtract( $wgOut );
2008         }
2009
2010
2011         /**
2012          * Show relevant lines from the deletion log
2013          */
2014         function showLogExtract( $out ) {
2015                 $out->addHtml( '<h2>' . htmlspecialchars( LogPage::logName( 'delete' ) ) . '</h2>' );
2016                 $logViewer = new LogViewer(
2017                         new LogReader(
2018                                 new FauxRequest(
2019                                         array( 'page' => $this->mTitle->getPrefixedText(),
2020                                                'type' => 'delete' ) ) ) );
2021                 $logViewer->showList( $out );
2022         }
2023
2024
2025         /**
2026          * Perform a deletion and output success or failure messages
2027          */
2028         function doDelete( $reason ) {
2029                 global $wgOut, $wgUser;
2030                 wfDebug( __METHOD__."\n" );
2031
2032                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
2033                         if ( $this->doDeleteArticle( $reason ) ) {
2034                                 $deleted = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2035
2036                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2037                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2038
2039                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
2040                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
2041
2042                                 $wgOut->addWikiText( $text );
2043                                 $wgOut->returnToMain( false );
2044                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
2045                         } else {
2046                                 $wgOut->showFatalError( wfMsg( 'cannotdelete' ) );
2047                         }
2048                 }
2049         }
2050
2051         /**
2052          * Back-end article deletion
2053          * Deletes the article with database consistency, writes logs, purges caches
2054          * Returns success
2055          */
2056         function doDeleteArticle( $reason ) {
2057                 global $wgUseSquid, $wgDeferredUpdateList;
2058                 global $wgUseTrackbacks;
2059
2060                 wfDebug( __METHOD__."\n" );
2061
2062                 $dbw = wfGetDB( DB_MASTER );
2063                 $ns = $this->mTitle->getNamespace();
2064                 $t = $this->mTitle->getDBkey();
2065                 $id = $this->mTitle->getArticleID();
2066
2067                 if ( $t == '' || $id == 0 ) {
2068                         return false;
2069                 }
2070
2071                 $u = new SiteStatsUpdate( 0, 1, -(int)$this->isCountable( $this->getContent() ), -1 );
2072                 array_push( $wgDeferredUpdateList, $u );
2073
2074                 // For now, shunt the revision data into the archive table.
2075                 // Text is *not* removed from the text table; bulk storage
2076                 // is left intact to avoid breaking block-compression or
2077                 // immutable storage schemes.
2078                 //
2079                 // For backwards compatibility, note that some older archive
2080                 // table entries will have ar_text and ar_flags fields still.
2081                 //
2082                 // In the future, we may keep revisions and mark them with
2083                 // the rev_deleted field, which is reserved for this purpose.
2084                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
2085                         array(
2086                                 'ar_namespace'  => 'page_namespace',
2087                                 'ar_title'      => 'page_title',
2088                                 'ar_comment'    => 'rev_comment',
2089                                 'ar_user'       => 'rev_user',
2090                                 'ar_user_text'  => 'rev_user_text',
2091                                 'ar_timestamp'  => 'rev_timestamp',
2092                                 'ar_minor_edit' => 'rev_minor_edit',
2093                                 'ar_rev_id'     => 'rev_id',
2094                                 'ar_text_id'    => 'rev_text_id',
2095                                 'ar_text'       => '\'\'', // Be explicit to appease
2096                                 'ar_flags'      => '\'\'', // MySQL's "strict mode"...
2097                                 'ar_len'                => 'rev_len'
2098                         ), array(
2099                                 'page_id' => $id,
2100                                 'page_id = rev_page'
2101                         ), __METHOD__
2102                 );
2103
2104                 # Delete restrictions for it
2105                 $dbw->delete( 'page_restrictions', array ( 'pr_page' => $id ), __METHOD__ );
2106
2107                 # Now that it's safely backed up, delete it
2108                 $dbw->delete( 'page', array( 'page_id' => $id ), __METHOD__);
2109
2110                 # If using cascading deletes, we can skip some explicit deletes
2111                 if ( !$dbw->cascadingDeletes() ) {
2112
2113                         $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
2114
2115                         if ($wgUseTrackbacks)
2116                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
2117
2118                         # Delete outgoing links
2119                         $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
2120                         $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
2121                         $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
2122                         $dbw->delete( 'templatelinks', array( 'tl_from' => $id ) );
2123                         $dbw->delete( 'externallinks', array( 'el_from' => $id ) );
2124                         $dbw->delete( 'langlinks', array( 'll_from' => $id ) );
2125                         $dbw->delete( 'redirect', array( 'rd_from' => $id ) );
2126                 }
2127
2128                 # If using cleanup triggers, we can skip some manual deletes
2129                 if ( !$dbw->cleanupTriggers() ) {
2130
2131                         # Clean up recentchanges entries...
2132                         $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), __METHOD__ );
2133                 }
2134
2135                 # Clear caches
2136                 Article::onArticleDelete( $this->mTitle );
2137
2138                 # Log the deletion
2139                 $log = new LogPage( 'delete' );
2140                 $log->addEntry( 'delete', $this->mTitle, $reason );
2141
2142                 # Clear the cached article id so the interface doesn't act like we exist
2143                 $this->mTitle->resetArticleID( 0 );
2144                 $this->mTitle->mArticleID = 0;
2145                 return true;
2146         }
2147
2148         /**
2149          * Revert a modification
2150          */
2151         function rollback() {
2152                 global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
2153
2154                 if( $wgUser->isAllowed( 'rollback' ) ) {
2155                         if( $wgUser->isBlocked() ) {
2156                                 $wgOut->blockedPage();
2157                                 return;
2158                         }
2159                 } else {
2160                         $wgOut->permissionRequired( 'rollback' );
2161                         return;
2162                 }
2163
2164                 if ( wfReadOnly() ) {
2165                         $wgOut->readOnlyPage( $this->getContent() );
2166                         return;
2167                 }
2168                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
2169                         array( $this->mTitle->getPrefixedText(),
2170                                 $wgRequest->getVal( 'from' ) )  ) ) {
2171                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
2172                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
2173                         return;
2174                 }
2175                 $dbw = wfGetDB( DB_MASTER );
2176
2177                 # Enhanced rollback, marks edits rc_bot=1
2178                 $bot = $wgRequest->getBool( 'bot' );
2179
2180                 # Replace all this user's current edits with the next one down
2181
2182                 # Get the last editor
2183                 $current = Revision::newFromTitle( $this->mTitle );
2184                 if( is_null( $current ) ) {
2185                         # Something wrong... no page?
2186                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
2187                         return;
2188                 }
2189
2190                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
2191                 if( $from != $current->getUserText() ) {
2192                         $wgOut->setPageTitle( wfMsg('rollbackfailed') );
2193                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
2194                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
2195                                 htmlspecialchars( $from ),
2196                                 htmlspecialchars( $current->getUserText() ) ) );
2197                         if( $current->getComment() != '') {
2198                                 $wgOut->addHTML(
2199                                         wfMsg( 'editcomment',
2200                                         $wgUser->getSkin()->formatComment( $current->getComment() ) ) );
2201                         }
2202                         return;
2203                 }
2204
2205                 # Get the last edit not by this guy
2206                 $user = intval( $current->getUser() );
2207                 $user_text = $dbw->addQuotes( $current->getUserText() );
2208                 $s = $dbw->selectRow( 'revision',
2209                         array( 'rev_id', 'rev_timestamp' ),
2210                         array(
2211                                 'rev_page' => $current->getPage(),
2212                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
2213                         ), __METHOD__,
2214                         array(
2215                                 'USE INDEX' => 'page_timestamp',
2216                                 'ORDER BY'  => 'rev_timestamp DESC' )
2217                         );
2218                 if( $s === false ) {
2219                         # Something wrong
2220                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
2221                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
2222                         return;
2223                 }
2224
2225                 $set = array();
2226                 if ( $bot ) {
2227                         # Mark all reverted edits as bot
2228                         $set['rc_bot'] = 1;
2229                 }
2230                 if ( $wgUseRCPatrol ) {
2231                         # Mark all reverted edits as patrolled
2232                         $set['rc_patrolled'] = 1;
2233                 }
2234
2235                 if ( $set ) {
2236                         $dbw->update( 'recentchanges', $set,
2237                                 array( /* WHERE */
2238                                         'rc_cur_id'    => $current->getPage(),
2239                                         'rc_user_text' => $current->getUserText(),
2240                                         "rc_timestamp > '{$s->rev_timestamp}'",
2241                                 ), __METHOD__
2242                         );
2243                 }
2244
2245                 # Get the edit summary
2246                 $target = Revision::newFromId( $s->rev_id );
2247                 $newComment = wfMsgForContent( 'revertpage', $target->getUserText(), $from );
2248                 $newComment = $wgRequest->getText( 'summary', $newComment );
2249
2250                 # Save it!
2251                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
2252                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
2253                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newComment ) . "</h2>\n<hr />\n" );
2254
2255                 $this->updateArticle( $target->getText(), $newComment, 1, $this->mTitle->userIsWatching(), $bot );
2256
2257                 $wgOut->returnToMain( false );
2258         }
2259
2260
2261         /**
2262          * Do standard deferred updates after page view
2263          * @private
2264          */
2265         function viewUpdates() {
2266                 global $wgDeferredUpdateList;
2267
2268                 if ( 0 != $this->getID() ) {
2269                         global $wgDisableCounters;
2270                         if( !$wgDisableCounters ) {
2271                                 Article::incViewCount( $this->getID() );
2272                                 $u = new SiteStatsUpdate( 1, 0, 0 );
2273                                 array_push( $wgDeferredUpdateList, $u );
2274                         }
2275                 }
2276
2277                 # Update newtalk / watchlist notification status
2278                 global $wgUser;
2279                 $wgUser->clearNotification( $this->mTitle );
2280         }
2281
2282         /**
2283          * Do standard deferred updates after page edit.
2284          * Update links tables, site stats, search index and message cache.
2285          * Every 1000th edit, prune the recent changes table.
2286          *
2287          * @private
2288          * @param $text New text of the article
2289          * @param $summary Edit summary
2290          * @param $minoredit Minor edit
2291          * @param $timestamp_of_pagechange Timestamp associated with the page change
2292          * @param $newid rev_id value of the new revision
2293          * @param $changed Whether or not the content actually changed
2294          */
2295         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange, $newid, $changed = true ) {
2296                 global $wgDeferredUpdateList, $wgMessageCache, $wgUser, $wgParser;
2297
2298                 wfProfileIn( __METHOD__ );
2299
2300                 # Parse the text
2301                 $options = new ParserOptions;
2302                 $options->setTidy(true);
2303                 $poutput = $wgParser->parse( $text, $this->mTitle, $options, true, true, $newid );
2304
2305                 # Save it to the parser cache
2306                 $parserCache =& ParserCache::singleton();
2307                 $parserCache->save( $poutput, $this, $wgUser );
2308
2309                 # Update the links tables
2310                 $u = new LinksUpdate( $this->mTitle, $poutput );
2311                 $u->doUpdate();
2312
2313                 if ( wfRunHooks( 'ArticleEditUpdatesDeleteFromRecentchanges', array( &$this ) ) ) {
2314                         wfSeedRandom();
2315                         if ( 0 == mt_rand( 0, 99 ) ) {
2316                                 # Periodically flush old entries from the recentchanges table.
2317                                 global $wgRCMaxAge;
2318
2319                                 $dbw = wfGetDB( DB_MASTER );
2320                                 $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2321                                 $recentchanges = $dbw->tableName( 'recentchanges' );
2322                                 $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2323                                 $dbw->query( $sql );
2324                         }
2325                 }
2326
2327                 $id = $this->getID();
2328                 $title = $this->mTitle->getPrefixedDBkey();
2329                 $shortTitle = $this->mTitle->getDBkey();
2330
2331                 if ( 0 == $id ) {
2332                         wfProfileOut( __METHOD__ );
2333                         return;
2334                 }
2335
2336                 $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2337                 array_push( $wgDeferredUpdateList, $u );
2338                 $u = new SearchUpdate( $id, $title, $text );
2339                 array_push( $wgDeferredUpdateList, $u );
2340
2341                 # If this is another user's talk page, update newtalk
2342                 # Don't do this if $changed = false otherwise some idiot can null-edit a
2343                 # load of user talk pages and piss people off, nor if it's a minor edit
2344                 # by a properly-flagged bot.
2345                 if( $this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getTitleKey() && $changed
2346                         && !($minoredit && $wgUser->isAllowed('nominornewtalk') ) ) {
2347                         if (wfRunHooks('ArticleEditUpdateNewTalk', array(&$this)) ) {
2348                                 $other = User::newFromName( $shortTitle );
2349                                 if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2350                                         // An anonymous user
2351                                         $other = new User();
2352                                         $other->setName( $shortTitle );
2353                                 }
2354                                 if( $other ) {
2355                                         $other->setNewtalk( true );
2356                                 }
2357                         }
2358                 }
2359
2360                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2361                         $wgMessageCache->replace( $shortTitle, $text );
2362                 }
2363
2364                 wfProfileOut( __METHOD__ );
2365         }
2366
2367         /**
2368          * Perform article updates on a special page creation.
2369          *
2370          * @param Revision $rev
2371          *
2372          * @todo This is a shitty interface function. Kill it and replace the
2373          * other shitty functions like editUpdates and such so it's not needed
2374          * anymore.
2375          */
2376         function createUpdates( $rev ) {
2377                 $this->mGoodAdjustment = $this->isCountable( $rev->getText() );
2378                 $this->mTotalAdjustment = 1;
2379                 $this->editUpdates( $rev->getText(), $rev->getComment(),
2380                         $rev->isMinor(), wfTimestamp(), $rev->getId(), true );
2381         }
2382
2383         /**
2384          * Generate the navigation links when browsing through an article revisions
2385          * It shows the information as:
2386          *   Revision as of \<date\>; view current revision
2387          *   \<- Previous version | Next Version -\>
2388          *
2389          * @private
2390          * @param string $oldid         Revision ID of this article revision
2391          */
2392         function setOldSubtitle( $oldid=0 ) {
2393                 global $wgLang, $wgOut, $wgUser;
2394
2395                 if ( !wfRunHooks( 'DisplayOldSubtitle', array(&$this, &$oldid) ) ) {
2396                                 return;
2397                 }
2398
2399                 $revision = Revision::newFromId( $oldid );
2400
2401                 $current = ( $oldid == $this->mLatest );
2402                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2403                 $sk = $wgUser->getSkin();
2404                 $lnk = $current
2405                         ? wfMsg( 'currentrevisionlink' )
2406                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2407                 $curdiff = $current
2408                         ? wfMsg( 'diff' )
2409                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=cur&oldid='.$oldid );
2410                 $prev = $this->mTitle->getPreviousRevisionID( $oldid ) ;
2411                 $prevlink = $prev
2412                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid )
2413                         : wfMsg( 'previousrevision' );
2414                 $prevdiff = $prev
2415                         ? $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=prev&oldid='.$oldid )
2416                         : wfMsg( 'diff' );
2417                 $nextlink = $current
2418                         ? wfMsg( 'nextrevision' )
2419                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2420                 $nextdiff = $current
2421                         ? wfMsg( 'diff' )
2422                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'diff' ), 'diff=next&oldid='.$oldid );
2423
2424                 $userlinks = $sk->userLink( $revision->getUser(), $revision->getUserText() )
2425                                                 . $sk->userToolLinks( $revision->getUser(), $revision->getUserText() );
2426
2427                 $m = wfMsg( 'revision-info-current' );
2428                 $infomsg = $current && !wfEmptyMsg( 'revision-info-current', $m ) && $m != '-'
2429                         ? 'revision-info-current'
2430                         : 'revision-info';
2431
2432                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" . wfMsg( $infomsg, $td, $userlinks ) . "</div>\n" .
2433                      "\n\t\t\t\t<div id=\"mw-revision-nav\">" . wfMsg( 'revision-nav', $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
2434                 $wgOut->setSubtitle( $r );
2435         }
2436
2437         /**
2438          * This function is called right before saving the wikitext,
2439          * so we can do things like signatures and links-in-context.
2440          *
2441          * @param string $text
2442          */
2443         function preSaveTransform( $text ) {
2444                 global $wgParser, $wgUser;
2445                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2446         }
2447
2448         /* Caching functions */
2449
2450         /**
2451          * checkLastModified returns true if it has taken care of all
2452          * output to the client that is necessary for this request.
2453          * (that is, it has sent a cached version of the page)
2454          */
2455         function tryFileCache() {
2456                 static $called = false;
2457                 if( $called ) {
2458                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
2459                         return;
2460                 }
2461                 $called = true;
2462                 if($this->isFileCacheable()) {
2463                         $touched = $this->mTouched;
2464                         $cache = new HTMLFileCache( $this->mTitle );
2465                         if($cache->isFileCacheGood( $touched )) {
2466                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
2467                                 $cache->loadFromFileCache();
2468                                 return true;
2469                         } else {
2470                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
2471                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2472                         }
2473                 } else {
2474                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
2475                 }
2476         }
2477
2478         /**
2479          * Check if the page can be cached
2480          * @return bool
2481          */
2482         function isFileCacheable() {
2483                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest, $wgLang, $wgContLang;
2484                 $action    = $wgRequest->getVal( 'action'    );
2485                 $oldid     = $wgRequest->getVal( 'oldid'     );
2486                 $diff      = $wgRequest->getVal( 'diff'      );
2487                 $redirect  = $wgRequest->getVal( 'redirect'  );
2488                 $printable = $wgRequest->getVal( 'printable' );
2489                 $page      = $wgRequest->getVal( 'page' );
2490
2491                 //check for non-standard user language; this covers uselang,
2492                 //and extensions for auto-detecting user language.
2493                 $ulang     = $wgLang->getCode();
2494                 $clang     = $wgContLang->getCode();
2495
2496                 $cacheable = $wgUseFileCache
2497                         && (!$wgShowIPinHeader)
2498                         && ($this->getID() != 0)
2499                         && ($wgUser->isAnon())
2500                         && (!$wgUser->getNewtalk())
2501                         && ($this->mTitle->getNamespace() != NS_SPECIAL )
2502                         && (empty( $action ) || $action == 'view')
2503                         && (!isset($oldid))
2504                         && (!isset($diff))
2505                         && (!isset($redirect))
2506                         && (!isset($printable))
2507                         && !isset($page)
2508                         && (!$this->mRedirectedFrom)
2509                         && ($ulang === $clang);
2510
2511                 if ( $cacheable ) {
2512                         //extension may have reason to disable file caching on some pages.
2513                         $cacheable = wfRunHooks( 'IsFileCacheable', array( $this ) );
2514                 }
2515
2516                 return $cacheable;
2517         }
2518
2519         /**
2520          * Loads page_touched and returns a value indicating if it should be used
2521          *
2522          */
2523         function checkTouched() {
2524                 if( !$this->mDataLoaded ) {
2525                         $this->loadPageData();
2526                 }
2527                 return !$this->mIsRedirect;
2528         }
2529
2530         /**
2531          * Get the page_touched field
2532          */
2533         function getTouched() {
2534                 # Ensure that page data has been loaded
2535                 if( !$this->mDataLoaded ) {
2536                         $this->loadPageData();
2537                 }
2538                 return $this->mTouched;
2539         }
2540
2541         /**
2542          * Get the page_latest field
2543          */
2544         function getLatest() {
2545                 if ( !$this->mDataLoaded ) {
2546                         $this->loadPageData();
2547                 }
2548                 return $this->mLatest;
2549         }
2550
2551         /**
2552          * Edit an article without doing all that other stuff
2553          * The article must already exist; link tables etc
2554          * are not updated, caches are not flushed.
2555          *
2556          * @param string $text text submitted
2557          * @param string $comment comment submitted
2558          * @param bool $minor whereas it's a minor modification
2559          */
2560         function quickEdit( $text, $comment = '', $minor = 0 ) {
2561                 wfProfileIn( __METHOD__ );
2562
2563                 $dbw = wfGetDB( DB_MASTER );
2564                 $dbw->begin();
2565                 $revision = new Revision( array(
2566                         'page'       => $this->getId(),
2567                         'text'       => $text,
2568                         'comment'    => $comment,
2569                         'minor_edit' => $minor ? 1 : 0,
2570                         ) );
2571                 $revision->insertOn( $dbw );
2572                 $this->updateRevisionOn( $dbw, $revision );
2573                 $dbw->commit();
2574
2575                 wfProfileOut( __METHOD__ );
2576         }
2577
2578         /**
2579          * Used to increment the view counter
2580          *
2581          * @static
2582          * @param integer $id article id
2583          */
2584         function incViewCount( $id ) {
2585                 $id = intval( $id );
2586                 global $wgHitcounterUpdateFreq, $wgDBtype;
2587
2588                 $dbw = wfGetDB( DB_MASTER );
2589                 $pageTable = $dbw->tableName( 'page' );
2590                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2591                 $acchitsTable = $dbw->tableName( 'acchits' );
2592
2593                 if( $wgHitcounterUpdateFreq <= 1 ) {
2594                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2595                         return;
2596                 }
2597
2598                 # Not important enough to warrant an error page in case of failure
2599                 $oldignore = $dbw->ignoreErrors( true );
2600
2601                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2602
2603                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2604                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2605                         # Most of the time (or on SQL errors), skip row count check
2606                         $dbw->ignoreErrors( $oldignore );
2607                         return;
2608                 }
2609
2610                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2611                 $row = $dbw->fetchObject( $res );
2612                 $rown = intval( $row->n );
2613                 if( $rown >= $wgHitcounterUpdateFreq ){
2614                         wfProfileIn( 'Article::incViewCount-collect' );
2615                         $old_user_abort = ignore_user_abort( true );
2616
2617                         if ($wgDBtype == 'mysql')
2618                                 $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2619                         $tabletype = $wgDBtype == 'mysql' ? "ENGINE=HEAP " : '';
2620                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable $tabletype AS ".
2621                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2622                                 'GROUP BY hc_id');
2623                         $dbw->query("DELETE FROM $hitcounterTable");
2624                         if ($wgDBtype == 'mysql') {
2625                                 $dbw->query('UNLOCK TABLES');
2626                                 $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2627                                         'WHERE page_id = hc_id');
2628                         }
2629                         else {
2630                                 $dbw->query("UPDATE $pageTable SET page_counter=page_counter + hc_n ".
2631                                         "FROM $acchitsTable WHERE page_id = hc_id");
2632                         }
2633                         $dbw->query("DROP TABLE $acchitsTable");
2634
2635                         ignore_user_abort( $old_user_abort );
2636                         wfProfileOut( 'Article::incViewCount-collect' );
2637                 }
2638                 $dbw->ignoreErrors( $oldignore );
2639         }
2640
2641         /**#@+
2642          * The onArticle*() functions are supposed to be a kind of hooks
2643          * which should be called whenever any of the specified actions
2644          * are done.
2645          *
2646          * This is a good place to put code to clear caches, for instance.
2647          *
2648          * This is called on page move and undelete, as well as edit
2649          * @static
2650          * @param $title_obj a title object
2651          */
2652
2653         static function onArticleCreate($title) {
2654                 # The talk page isn't in the regular link tables, so we need to update manually:
2655                 if ( $title->isTalkPage() ) {
2656                         $other = $title->getSubjectPage();
2657                 } else {
2658                         $other = $title->getTalkPage();
2659                 }
2660                 $other->invalidateCache();
2661                 $other->purgeSquid();
2662
2663                 $title->touchLinks();
2664                 $title->purgeSquid();
2665         }
2666
2667         static function onArticleDelete( $title ) {
2668                 global $wgUseFileCache, $wgMessageCache;
2669
2670                 $title->touchLinks();
2671                 $title->purgeSquid();
2672
2673                 # File cache
2674                 if ( $wgUseFileCache ) {
2675                         $cm = new HTMLFileCache( $title );
2676                         @unlink( $cm->fileCacheName() );
2677                 }
2678
2679                 if( $title->getNamespace() == NS_MEDIAWIKI) {
2680                         $wgMessageCache->replace( $title->getDBkey(), false );
2681                 }
2682         }
2683
2684         /**
2685          * Purge caches on page update etc
2686          */
2687         static function onArticleEdit( $title ) {
2688                 global $wgDeferredUpdateList, $wgUseFileCache;
2689
2690                 // Invalidate caches of articles which include this page
2691                 $update = new HTMLCacheUpdate( $title, 'templatelinks' );
2692                 $wgDeferredUpdateList[] = $update;
2693
2694                 # Purge squid for this page only
2695                 $title->purgeSquid();
2696
2697                 # Clear file cache
2698                 if ( $wgUseFileCache ) {
2699                         $cm = new HTMLFileCache( $title );
2700                         @unlink( $cm->fileCacheName() );
2701                 }
2702         }
2703
2704         /**#@-*/
2705
2706         /**
2707          * Info about this page
2708          * Called for ?action=info when $wgAllowPageInfo is on.
2709          *
2710          * @public
2711          */
2712         function info() {
2713                 global $wgLang, $wgOut, $wgAllowPageInfo, $wgUser;
2714
2715                 if ( !$wgAllowPageInfo ) {
2716                         $wgOut->showErrorPage( 'nosuchaction', 'nosuchactiontext' );
2717                         return;
2718                 }
2719
2720                 $page = $this->mTitle->getSubjectPage();
2721
2722                 $wgOut->setPagetitle( $page->getPrefixedText() );
2723                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2724
2725                 # first, see if the page exists at all.
2726                 $exists = $page->getArticleId() != 0;
2727                 if( !$exists ) {
2728                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2729                                 $wgOut->addHTML(wfMsgWeirdKey ( $this->mTitle->getText() ) );
2730                         } else {
2731                                 $wgOut->addHTML(wfMsg( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon' ) );
2732                         }
2733                 } else {
2734                         $dbr = wfGetDB( DB_SLAVE );
2735                         $wl_clause = array(
2736                                 'wl_title'     => $page->getDBkey(),
2737                                 'wl_namespace' => $page->getNamespace() );
2738                         $numwatchers = $dbr->selectField(
2739                                 'watchlist',
2740                                 'COUNT(*)',
2741                                 $wl_clause,
2742                                 __METHOD__,
2743                                 $this->getSelectOptions() );
2744
2745                         $pageInfo = $this->pageCountInfo( $page );
2746                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2747
2748                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2749                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2750                         if( $talkInfo ) {
2751                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2752                         }
2753                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2754                         if( $talkInfo ) {
2755                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2756                         }
2757                         $wgOut->addHTML( '</ul>' );
2758
2759                 }
2760         }
2761
2762         /**
2763          * Return the total number of edits and number of unique editors
2764          * on a given page. If page does not exist, returns false.
2765          *
2766          * @param Title $title
2767          * @return array
2768          * @private
2769          */
2770         function pageCountInfo( $title ) {
2771                 $id = $title->getArticleId();
2772                 if( $id == 0 ) {
2773                         return false;
2774                 }
2775
2776                 $dbr = wfGetDB( DB_SLAVE );
2777
2778                 $rev_clause = array( 'rev_page' => $id );
2779
2780                 $edits = $dbr->selectField(
2781                         'revision',
2782                         'COUNT(rev_page)',
2783                         $rev_clause,
2784                         __METHOD__,
2785                         $this->getSelectOptions() );
2786
2787                 $authors = $dbr->selectField(
2788                         'revision',
2789                         'COUNT(DISTINCT rev_user_text)',
2790                         $rev_clause,
2791                         __METHOD__,
2792                         $this->getSelectOptions() );
2793
2794                 return array( 'edits' => $edits, 'authors' => $authors );
2795         }
2796
2797         /**
2798          * Return a list of templates used by this article.
2799          * Uses the templatelinks table
2800          *
2801          * @return array Array of Title objects
2802          */
2803         function getUsedTemplates() {
2804                 $result = array();
2805                 $id = $this->mTitle->getArticleID();
2806                 if( $id == 0 ) {
2807                         return array();
2808                 }
2809
2810                 $dbr = wfGetDB( DB_SLAVE );
2811                 $res = $dbr->select( array( 'templatelinks' ),
2812                         array( 'tl_namespace', 'tl_title' ),
2813                         array( 'tl_from' => $id ),
2814                         'Article:getUsedTemplates' );
2815                 if ( false !== $res ) {
2816                         if ( $dbr->numRows( $res ) ) {
2817                                 while ( $row = $dbr->fetchObject( $res ) ) {
2818                                         $result[] = Title::makeTitle( $row->tl_namespace, $row->tl_title );
2819                                 }
2820                         }
2821                 }
2822                 $dbr->freeResult( $res );
2823                 return $result;
2824         }
2825
2826         /**
2827          * Return an auto-generated summary if the text provided is a redirect.
2828          *
2829          * @param  string $text The wikitext to check
2830          * @return string '' or an appropriate summary
2831          */
2832         public static function getRedirectAutosummary( $text ) {
2833                 $rt = Title::newFromRedirect( $text );
2834                 if( is_object( $rt ) )
2835                         return wfMsgForContent( 'autoredircomment', $rt->getFullText() );
2836                 else
2837                         return '';
2838         }
2839
2840         /**
2841          * Return an auto-generated summary if the new text is much shorter than
2842          * the old text.
2843          *
2844          * @param  string $oldtext The previous text of the page
2845          * @param  string $text    The submitted text of the page
2846          * @return string An appropriate autosummary, or an empty string.
2847          */
2848         public static function getBlankingAutosummary( $oldtext, $text ) {
2849                 if ($oldtext!='' && $text=='') {
2850                         return wfMsgForContent('autosumm-blank');
2851                 } elseif (strlen($oldtext) > 10 * strlen($text) && strlen($text) < 500) {
2852                         #Removing more than 90% of the article
2853                         global $wgContLang;
2854                         $truncatedtext = $wgContLang->truncate($text, max(0, 200 - strlen(wfMsgForContent('autosumm-replace'))), '...');
2855                         return wfMsgForContent('autosumm-replace', $truncatedtext);
2856                 } else {
2857                         return '';
2858                 }
2859         }
2860
2861         /**
2862         * Return an applicable autosummary if one exists for the given edit.
2863         * @param string $oldtext The previous text of the page.
2864         * @param string $newtext The submitted text of the page.
2865         * @param bitmask $flags A bitmask of flags submitted for the edit.
2866         * @return string An appropriate autosummary, or an empty string.
2867         */
2868         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2869
2870                 # This code is UGLY UGLY UGLY.
2871                 # Somebody PLEASE come up with a more elegant way to do it.
2872
2873                 #Redirect autosummaries
2874                 $summary = self::getRedirectAutosummary( $newtext );
2875
2876                 if ($summary)
2877                         return $summary;
2878
2879                 #Blanking autosummaries
2880                 if (!($flags & EDIT_NEW))
2881                         $summary = self::getBlankingAutosummary( $oldtext, $newtext );
2882
2883                 if ($summary)
2884                         return $summary;
2885
2886                 #New page autosummaries
2887                 if ($flags & EDIT_NEW && strlen($newtext)) {
2888                         #If they're making a new article, give its text, truncated, in the summary.
2889                         global $wgContLang;
2890                         $truncatedtext = $wgContLang->truncate(
2891                                 str_replace("\n", ' ', $newtext),
2892                                 max( 0, 200 - strlen( wfMsgForContent( 'autosumm-new') ) ),
2893                                 '...' );
2894                         $summary = wfMsgForContent( 'autosumm-new', $truncatedtext );
2895                 }
2896
2897                 if ($summary)
2898                         return $summary;
2899
2900                 return $summary;
2901         }
2902
2903         /**
2904          * Add the primary page-view wikitext to the output buffer
2905          * Saves the text into the parser cache if possible.
2906          * Updates templatelinks if it is out of date.
2907          *
2908          * @param string  $text
2909          * @param bool    $cache
2910          */
2911         public function outputWikiText( $text, $cache = true ) {
2912                 global $wgParser, $wgUser, $wgOut;
2913
2914                 $popts = $wgOut->parserOptions();
2915                 $popts->setTidy(true);
2916                 $parserOutput = $wgParser->parse( $text, $this->mTitle,
2917                         $popts, true, true, $this->getRevIdFetched() );
2918                 $popts->setTidy(false);
2919                 if ( $cache && $this && $parserOutput->getCacheTime() != -1 ) {
2920                         $parserCache =& ParserCache::singleton();
2921                         $parserCache->save( $parserOutput, $this, $wgUser );
2922                 }
2923
2924                 if ( !wfReadOnly() && $this->mTitle->areRestrictionsCascading() ) {
2925                         // templatelinks table may have become out of sync,
2926                         // especially if using variable-based transclusions.
2927                         // For paranoia, check if things have changed and if
2928                         // so apply updates to the database. This will ensure
2929                         // that cascaded protections apply as soon as the changes
2930                         // are visible.
2931
2932                         # Get templates from templatelinks
2933                         $id = $this->mTitle->getArticleID();
2934
2935                         $tlTemplates = array();
2936
2937                         $dbr = wfGetDB( DB_SLAVE );
2938                         $res = $dbr->select( array( 'templatelinks' ),
2939                                 array( 'tl_namespace', 'tl_title' ),
2940                                 array( 'tl_from' => $id ),
2941                                 'Article:getUsedTemplates' );
2942
2943                         global $wgContLang;
2944
2945                         if ( false !== $res ) {
2946                                 if ( $dbr->numRows( $res ) ) {
2947                                         while ( $row = $dbr->fetchObject( $res ) ) {
2948                                                 $tlTemplates[] = $wgContLang->getNsText( $row->tl_namespace ) . ':' . $row->tl_title ;
2949                                         }
2950                                 }
2951                         }
2952
2953                         # Get templates from parser output.
2954                         $poTemplates_allns = $parserOutput->getTemplates();
2955
2956                         $poTemplates = array ();
2957                         foreach ( $poTemplates_allns as $ns_templates ) {
2958                                 $poTemplates = array_merge( $poTemplates, $ns_templates );
2959                         }
2960
2961                         # Get the diff
2962                         $templates_diff = array_diff( $poTemplates, $tlTemplates );
2963
2964                         if ( count( $templates_diff ) > 0 ) {
2965                                 # Whee, link updates time.
2966                                 $u = new LinksUpdate( $this->mTitle, $parserOutput );
2967
2968                                 $dbw = wfGetDb( DB_MASTER );
2969                                 $dbw->begin();
2970
2971                                 $u->doUpdate();
2972
2973                                 $dbw->commit();
2974                         }
2975                 }
2976
2977                 $wgOut->addParserOutput( $parserOutput );
2978         }
2979
2980 }
2981
2982 ?>