includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Need the CacheManager to be loaded
   9  */
  10 require_once( 'CacheManager.php' );
  11 require_once( 'Revision.php' );
  12
  13 $wgArticleCurContentFields = false;
  14 $wgArticleOldContentFields = false;
  15
  16 /**
  17  * Class representing a MediaWiki article and history.
  18  *
  19  * See design.txt for an overview.
  20  * Note: edit user interface and cache support functions have been
  21  * moved to separate EditPage and CacheManager classes.
  22  *
  23  * @package MediaWiki
  24  */
  25 class Article {
  26         /**#@+
  27          * @access private
  28          */
  29         var $mContent, $mContentLoaded;
  30         var $mUser, $mTimestamp, $mUserText;
  31         var $mCounter, $mComment, $mGoodAdjustment, $mTotalAdjustment;
  32         var $mMinorEdit, $mRedirectedFrom;
  33         var $mTouched, $mFileCache, $mTitle;
  34         var $mId, $mTable;
  35         var $mForUpdate;
  36         var $mOldId;
  37         var $mRevIdFetched;
  38         var $mRevision;
  39         /**#@-*/
  40
  41         /**
  42          * Constructor and clear the article
  43          * @param mixed &$title
  44          */
  45         function Article( &$title ) {
  46                 $this->mTitle =& $title;
  47                 $this->clear();
  48         }
  49
  50         /**
  51          * get the title object of the article
  52          * @public
  53          */
  54         function getTitle() {
  55                 return $this->mTitle;
  56         }
  57
  58         /**
  59           * Clear the object
  60           * @private
  61           */
  62         function clear() {
  63                 $this->mDataLoaded    = false;
  64                 $this->mContentLoaded = false;
  65
  66                 $this->mCurID = $this->mUser = $this->mCounter = -1; # Not loaded
  67                 $this->mRedirectedFrom = $this->mUserText =
  68                 $this->mTimestamp = $this->mComment = $this->mFileCache = '';
  69                 $this->mGoodAdjustment = $this->mTotalAdjustment = 0;
  70                 $this->mTouched = '19700101000000';
  71                 $this->mForUpdate = false;
  72                 $this->mIsRedirect = false;
  73                 $this->mRevIdFetched = 0;
  74         }
  75
  76         /**
  77          * Note that getContent/loadContent may follow redirects if
  78          * not told otherwise, and so may cause a change to mTitle.
  79          *
  80          * @param $noredir
  81          * @return Return the text of this revision
  82         */
  83         function getContent( $noredir ) {
  84                 global $wgRequest, $wgUser, $wgOut;
  85
  86                 # Get variables from query string :P
  87                 $action = $wgRequest->getText( 'action', 'view' );
  88                 $section = $wgRequest->getText( 'section' );
  89                 $preload = $wgRequest->getText( 'preload' );
  90
  91                 $fname =  'Article::getContent';
  92                 wfProfileIn( $fname );
  93
  94                 if ( 0 == $this->getID() ) {
  95                         if ( 'edit' == $action ) {
  96                                 wfProfileOut( $fname );
  97
  98                                 # If requested, preload some text.
  99                                 $text=$this->getPreloadedText($preload);
 100
 101                                 # We used to put MediaWiki:Newarticletext here if
 102                                 # $text was empty at this point.
 103                                 # This is now shown above the edit box instead.
 104                                 return $text;
 105                         }
 106                         wfProfileOut( $fname );
 107                         $wgOut->setRobotpolicy( 'noindex,nofollow' );
 108                         return wfMsg( 'noarticletext' );
 109                 } else {
 110                         $this->loadContent( $noredir );
 111                         # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 112                         if ( $this->mTitle->getNamespace() == NS_USER_TALK &&
 113                           $wgUser->isIP($this->mTitle->getText()) &&
 114                           $action=='view'
 115                         ) {
 116                                 wfProfileOut( $fname );
 117                                 return $this->mContent . "\n" .wfMsg('anontalkpagetext');
 118                         } else {
 119                                 if($action=='edit') {
 120                                         if($section!='') {
 121                                                 if($section=='new') {
 122                                                         wfProfileOut( $fname );
 123                                                         $text=$this->getPreloadedText($preload);
 124                                                         return $text;
 125                                                 }
 126
 127                                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 128                                                 # comments to be stripped as well)
 129                                                 $rv=$this->getSection($this->mContent,$section);
 130                                                 wfProfileOut( $fname );
 131                                                 return $rv;
 132                                         }
 133                                 }
 134                                 wfProfileOut( $fname );
 135                                 return $this->mContent;
 136                         }
 137                 }
 138         }
 139
 140         /**
 141                 This function accepts a title string as parameter
 142                 ($preload). If this string is non-empty, it attempts
 143                 to fetch the current revision text.
 144         */
 145         function getPreloadedText($preload) {
 146                 if($preload) {
 147                         $preloadTitle=Title::newFromText($preload);
 148                         if(isset($preloadTitle) && $preloadTitle->userCanRead()) {
 149                         $rev=Revision::newFromTitle($preloadTitle);
 150                         if($rev) {
 151                                 return $rev->getText();
 152                                 }
 153                         }
 154                 }
 155                 return '';
 156         }
 157
 158         /**
 159          * This function returns the text of a section, specified by a number ($section).
 160          * A section is text under a heading like == Heading == or <h1>Heading</h1>, or
 161          * the first section before any such heading (section 0).
 162          *
 163          * If a section contains subsections, these are also returned.
 164          *
 165          * @param string $text text to look in
 166          * @param integer $section section number
 167          * @return string text of the requested section
 168          */
 169         function getSection($text,$section) {
 170
 171                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
 172                 # comments to be stripped as well)
 173                 $striparray=array();
 174                 $parser=new Parser();
 175                 $parser->mOutputType=OT_WIKI;
 176                 $striptext=$parser->strip($text, $striparray, true);
 177
 178                 # now that we can be sure that no pseudo-sections are in the source,
 179                 # split it up by section
 180                 $secs =
 181                   preg_split(
 182                   '/(^=+.+?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)(?!\S)/mi',
 183                   $striptext, -1,
 184                   PREG_SPLIT_DELIM_CAPTURE);
 185                 if($section==0) {
 186                         $rv=$secs[0];
 187                 } else {
 188                         $headline=$secs[$section*2-1];
 189                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$headline,$matches);
 190                         $hlevel=$matches[1];
 191
 192                         # translate wiki heading into level
 193                         if(strpos($hlevel,'=')!==false) {
 194                                 $hlevel=strlen($hlevel);
 195                         }
 196
 197                         $rv=$headline. $secs[$section*2];
 198                         $count=$section+1;
 199
 200                         $break=false;
 201                         while(!empty($secs[$count*2-1]) && !$break) {
 202
 203                                 $subheadline=$secs[$count*2-1];
 204                                 preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$subheadline,$matches);
 205                                 $subhlevel=$matches[1];
 206                                 if(strpos($subhlevel,'=')!==false) {
 207                                         $subhlevel=strlen($subhlevel);
 208                                 }
 209                                 if($subhlevel > $hlevel) {
 210                                         $rv.=$subheadline.$secs[$count*2];
 211                                 }
 212                                 if($subhlevel <= $hlevel) {
 213                                         $break=true;
 214                                 }
 215                                 $count++;
 216
 217                         }
 218                 }
 219                 # reinsert stripped tags
 220                 $rv=$parser->unstrip($rv,$striparray);
 221                 $rv=$parser->unstripNoWiki($rv,$striparray);
 222                 $rv=trim($rv);
 223                 return $rv;
 224
 225         }
 226
 227         /**
 228          * Return an array of the columns of the "cur"-table
 229          */
 230         function getContentFields() {
 231                 return $wgArticleContentFields = array(
 232                   'old_text','old_flags',
 233                   'rev_timestamp','rev_user', 'rev_user_text', 'rev_comment','page_counter',
 234                   'page_namespace', 'page_title', 'page_restrictions','page_touched','page_is_redirect' );
 235         }
 236
 237         /**
 238          * Return the oldid of the article that is to be shown.
 239          * For requests with a "direction", this is not the oldid of the
 240          * query
 241          */
 242         function getOldID() {
 243                 global $wgRequest, $wgOut;
 244                 static $lastid;
 245
 246                 if ( isset( $lastid ) ) {
 247                         return $lastid;
 248                 }
 249                 # Query variables :P
 250                 $oldid = $wgRequest->getVal( 'oldid' );
 251                 if ( isset( $oldid ) ) {
 252                         $oldid = IntVal( $oldid );
 253                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 254                                 $nextid = $this->mTitle->getNextRevisionID( $oldid );
 255                                 if ( $nextid  ) {
 256                                         $oldid = $nextid;
 257                                 } else {
 258                                         $wgOut->redirect( $this->mTitle->getFullURL( 'redirect=no' ) );
 259                                 }
 260                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 261                                 $previd = $this->mTitle->getPreviousRevisionID( $oldid );
 262                                 if ( $previd ) {
 263                                         $oldid = $previd;
 264                                 } else {
 265                                         # TODO
 266                                 }
 267                         }
 268                         $lastid = $oldid;
 269                 }
 270                 return @$oldid; # "@" to be able to return "unset" without PHP complaining
 271         }
 272
 273
 274         /**
 275          * Load the revision (including cur_text) into this object
 276          */
 277         function loadContent( $noredir = false ) {
 278                 global $wgOut, $wgRequest;
 279
 280                 if ( $this->mContentLoaded ) return;
 281
 282                 # Query variables :P
 283                 $oldid = $this->getOldID();
 284                 $redirect = $wgRequest->getVal( 'redirect' );
 285
 286                 $fname = 'Article::loadContent';
 287
 288                 # Pre-fill content with error message so that if something
 289                 # fails we'll have something telling us what we intended.
 290
 291                 $t = $this->mTitle->getPrefixedText();
 292
 293                 $noredir = $noredir || ($wgRequest->getVal( 'redirect' ) == 'no')
 294                         || $wgRequest->getCheck( 'rdfrom' );
 295                 $this->mOldId = $oldid;
 296                 $this->fetchContent( $oldid, $noredir, true );
 297         }
 298
 299
 300         /**
 301          * Fetch a page record with the given conditions
 302          * @param Database $dbr
 303          * @param array    $conditions
 304          * @access private
 305          */
 306         function pageData( &$dbr, $conditions ) {
 307                 return $dbr->selectRow( 'page',
 308                         array(
 309                                 'page_id',
 310                                 'page_namespace',
 311                                 'page_title',
 312                                 'page_restrictions',
 313                                 'page_counter',
 314                                 'page_is_redirect',
 315                                 'page_is_new',
 316                                 'page_random',
 317                                 'page_touched',
 318                                 'page_latest',
 319                                 'page_len' ),
 320                         $conditions,
 321                         'Article::pageData' );
 322         }
 323
 324         function pageDataFromTitle( &$dbr, $title ) {
 325                 return $this->pageData( $dbr, array(
 326                         'page_namespace' => $title->getNamespace(),
 327                         'page_title'     => $title->getDBkey() ) );
 328         }
 329
 330         function pageDataFromId( &$dbr, $id ) {
 331                 return $this->pageData( $dbr, array(
 332                         'page_id' => IntVal( $id ) ) );
 333         }
 334
 335         /**
 336          * Set the general counter, title etc data loaded from
 337          * some source.
 338          *
 339          * @param object $data
 340          * @access private
 341          */
 342         function loadPageData( $data ) {
 343                 $this->mTitle->loadRestrictions( $data->page_restrictions );
 344                 $this->mTitle->mRestrictionsLoaded = true;
 345
 346                 $this->mCounter    = $data->page_counter;
 347                 $this->mTouched    = wfTimestamp( TS_MW, $data->page_touched );
 348                 $this->mIsRedirect = $data->page_is_redirect;
 349                 $this->mLatest     = $data->page_latest;
 350
 351                 $this->mDataLoaded = true;
 352         }
 353
 354         /**
 355          * Get text of an article from database
 356          * @param int $oldid 0 for whatever the latest revision is
 357          * @param bool $noredir Set to false to follow redirects
 358          * @param bool $globalTitle Set to true to change the global $wgTitle object when following redirects or other unexpected title changes
 359          * @return string
 360          */
 361         function fetchContent( $oldid = 0, $noredir = true, $globalTitle = false ) {
 362                 if ( $this->mContentLoaded ) {
 363                         return $this->mContent;
 364                 }
 365                 $dbr =& $this->getDB();
 366                 $fname = 'Article::fetchContent';
 367
 368                 # Pre-fill content with error message so that if something
 369                 # fails we'll have something telling us what we intended.
 370                 $t = $this->mTitle->getPrefixedText();
 371                 if( $oldid ) {
 372                         $t .= ',oldid='.$oldid;
 373                 }
 374                 if( isset( $redirect ) ) {
 375                         $redirect = ($redirect == 'no') ? 'no' : 'yes';
 376                         $t .= ',redirect='.$redirect;
 377                 }
 378                 $this->mContent = wfMsg( 'missingarticle', $t );
 379
 380                 if( $oldid ) {
 381                         $revision = Revision::newFromId( $oldid );
 382                         if( is_null( $revision ) ) {
 383                                 wfDebug( "$fname failed to retrieve specified revision, id $oldid\n" );
 384                                 return false;
 385                         }
 386                         $data = $this->pageDataFromId( $dbr, $revision->getPage() );
 387                         if( !$data ) {
 388                                 wfDebug( "$fname failed to get page data linked to revision id $oldid\n" );
 389                                 return false;
 390                         }
 391                         $this->mTitle = Title::makeTitle( $data->page_namespace, $data->page_title );
 392                         $this->loadPageData( $data );
 393                 } else {
 394                         if( !$this->mDataLoaded ) {
 395                                 $data = $this->pageDataFromTitle( $dbr, $this->mTitle );
 396                                 if( !$data ) {
 397                                         wfDebug( "$fname failed to find page data for title " . $this->mTitle->getPrefixedText() . "\n" );
 398                                         return false;
 399                                 }
 400                                 $this->loadPageData( $data );
 401                         }
 402                         $revision = Revision::newFromId( $this->mLatest );
 403                         if( is_null( $revision ) ) {
 404                                 wfDebug( "$fname failed to retrieve current page, rev_id $data->page_latest\n" );
 405                                 return false;
 406                         }
 407                 }
 408
 409                 # If we got a redirect, follow it (unless we've been told
 410                 # not to by either the function parameter or the query
 411                 if ( !$oldid && !$noredir ) {
 412                         $rt = Title::newFromRedirect( $revision->getText() );
 413                         # process if title object is valid and not special:userlogout
 414                         if ( $rt && ! ( $rt->getNamespace() == NS_SPECIAL && $rt->getText() == 'Userlogout' ) ) {
 415                                 # Gotta hand redirects to special pages differently:
 416                                 # Fill the HTTP response "Location" header and ignore
 417                                 # the rest of the page we're on.
 418                                 global $wgDisableHardRedirects;
 419                                 if( $globalTitle && !$wgDisableHardRedirects ) {
 420                                         global $wgOut;
 421                                         if ( $rt->getInterwiki() != '' && $rt->isLocal() ) {
 422                                                 $source = $this->mTitle->getFullURL( 'redirect=no' );
 423                                                 $wgOut->redirect( $rt->getFullURL( 'rdfrom=' . urlencode( $source ) ) ) ;
 424                                                 return false;
 425                                         }
 426                                         if ( $rt->getNamespace() == NS_SPECIAL ) {
 427                                                 $wgOut->redirect( $rt->getFullURL() );
 428                                                 return false;
 429                                         }
 430                                 }
 431                                 $redirData = $this->pageDataFromTitle( $dbr, $rt );
 432                                 if( $redirData ) {
 433                                         $redirRev = Revision::newFromId( $redirData->page_latest );
 434                                         if( !is_null( $redirRev ) ) {
 435                                                 $this->mRedirectedFrom = $this->mTitle->getPrefixedText();
 436                                                 $this->mTitle = $rt;
 437                                                 $data = $redirData;
 438                                                 $this->loadPageData( $data );
 439                                                 $revision = $redirRev;
 440                                         }
 441                                 }
 442                         }
 443                 }
 444
 445                 # if the title's different from expected, update...
 446                 if( $globalTitle ) {
 447                         global $wgTitle;
 448                         if( !$this->mTitle->equals( $wgTitle ) ) {
 449                                 $wgTitle = $this->mTitle;
 450                         }
 451                 }
 452
 453                 # Back to the business at hand...
 454                 $this->mContent   = $revision->getText();
 455
 456                 $this->mUser      = $revision->getUser();
 457                 $this->mUserText  = $revision->getUserText();
 458                 $this->mComment   = $revision->getComment();
 459                 $this->mTimestamp = wfTimestamp( TS_MW, $revision->getTimestamp() );
 460
 461                 $this->mRevIdFetched = $revision->getID();
 462                 $this->mContentLoaded = true;
 463                 $this->mRevision =& $revision;
 464
 465                 return $this->mContent;
 466         }
 467
 468         /**
 469          * Gets the article text without using so many damn globals
 470          * Returns false on error
 471          *
 472          * @param integer $oldid
 473          */
 474         function getContentWithoutUsingSoManyDamnGlobals( $oldid = 0, $noredir = false ) {
 475                 return $this->fetchContent( $oldid, $noredir, false );
 476         }
 477
 478         /**
 479          * Read/write accessor to select FOR UPDATE
 480          */
 481         function forUpdate( $x = NULL ) {
 482                 return wfSetVar( $this->mForUpdate, $x );
 483         }
 484
 485         /**
 486          * Get the database which should be used for reads
 487          */
 488         function &getDB() {
 489                 #if ( $this->mForUpdate ) {
 490                         return wfGetDB( DB_MASTER );
 491                 #} else {
 492                 #       return wfGetDB( DB_SLAVE );
 493                 #}
 494         }
 495
 496         /**
 497          * Get options for all SELECT statements
 498          * Can pass an option array, to which the class-wide options will be appended
 499          */
 500         function getSelectOptions( $options = '' ) {
 501                 if ( $this->mForUpdate ) {
 502                         if ( is_array( $options ) ) {
 503                                 $options[] = 'FOR UPDATE';
 504                         } else {
 505                                 $options = 'FOR UPDATE';
 506                         }
 507                 }
 508                 return $options;
 509         }
 510
 511         /**
 512          * Return the Article ID
 513          */
 514         function getID() {
 515                 if( $this->mTitle ) {
 516                         return $this->mTitle->getArticleID();
 517                 } else {
 518                         return 0;
 519                 }
 520         }
 521
 522         /**
 523          * Returns true if this article exists in the database.
 524          * @return bool
 525          */
 526         function exists() {
 527                 return $this->getId() != 0;
 528         }
 529
 530         /**
 531          * Get the view count for this article
 532          */
 533         function getCount() {
 534                 if ( -1 == $this->mCounter ) {
 535                         $id = $this->getID();
 536                         $dbr =& $this->getDB();
 537                         $this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
 538                                 'Article::getCount', $this->getSelectOptions() );
 539                 }
 540                 return $this->mCounter;
 541         }
 542
 543         /**
 544          * Would the given text make this article a "good" article (i.e.,
 545          * suitable for including in the article count)?
 546          * @param string $text Text to analyze
 547          * @return integer 1 if it can be counted else 0
 548          */
 549         function isCountable( $text ) {
 550                 global $wgUseCommaCount;
 551
 552                 if ( NS_MAIN != $this->mTitle->getNamespace() ) { return 0; }
 553                 if ( $this->isRedirect( $text ) ) { return 0; }
 554                 $token = ($wgUseCommaCount ? ',' : '[[' );
 555                 if ( false === strstr( $text, $token ) ) { return 0; }
 556                 return 1;
 557         }
 558
 559         /**
 560          * Tests if the article text represents a redirect
 561          */
 562         function isRedirect( $text = false ) {
 563                 if ( $text === false ) {
 564                         $this->loadContent();
 565                         $titleObj = Title::newFromRedirect( $this->fetchContent() );
 566                 } else {
 567                         $titleObj = Title::newFromRedirect( $text );
 568                 }
 569                 return $titleObj !== NULL;
 570         }
 571
 572         /**
 573          * Returns true if the currently-referenced revision is the current edit
 574          * to this page (and it exists).
 575          * @return bool
 576          */
 577         function isCurrent() {
 578                 return $this->exists() &&
 579                         isset( $this->mRevision ) &&
 580                         $this->mRevision->isCurrent();
 581         }
 582
 583         /**
 584          * Loads everything except the text
 585          * This isn't necessary for all uses, so it's only done if needed.
 586          * @private
 587          */
 588         function loadLastEdit() {
 589                 global $wgOut;
 590
 591                 if ( -1 != $this->mUser )
 592                         return;
 593
 594                 # New or non-existent articles have no user information
 595                 $id = $this->getID();
 596                 if ( 0 == $id ) return;
 597
 598                 $this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
 599                 if( !is_null( $this->mLastRevision ) ) {
 600                         $this->mUser      = $this->mLastRevision->getUser();
 601                         $this->mUserText  = $this->mLastRevision->getUserText();
 602                         $this->mTimestamp = $this->mLastRevision->getTimestamp();
 603                         $this->mComment   = $this->mLastRevision->getComment();
 604                         $this->mMinorEdit = $this->mLastRevision->isMinor();
 605                 }
 606         }
 607
 608         function getTimestamp() {
 609                 $this->loadLastEdit();
 610                 return $this->mTimestamp;
 611         }
 612
 613         function getUser() {
 614                 $this->loadLastEdit();
 615                 return $this->mUser;
 616         }
 617
 618         function getUserText() {
 619                 $this->loadLastEdit();
 620                 return $this->mUserText;
 621         }
 622
 623         function getComment() {
 624                 $this->loadLastEdit();
 625                 return $this->mComment;
 626         }
 627
 628         function getMinorEdit() {
 629                 $this->loadLastEdit();
 630                 return $this->mMinorEdit;
 631         }
 632
 633         function getRevIdFetched() {
 634                 $this->loadLastEdit();
 635                 return $this->mRevIdFetched;
 636         }
 637
 638         function getContributors($limit = 0, $offset = 0) {
 639                 $fname = 'Article::getContributors';
 640
 641                 # XXX: this is expensive; cache this info somewhere.
 642
 643                 $title = $this->mTitle;
 644                 $contribs = array();
 645                 $dbr =& $this->getDB();
 646                 $revTable = $dbr->tableName( 'revision' );
 647                 $userTable = $dbr->tableName( 'user' );
 648                 $encDBkey = $dbr->addQuotes( $title->getDBkey() );
 649                 $ns = $title->getNamespace();
 650                 $user = $this->getUser();
 651                 $pageId = $this->getId();
 652
 653                 $sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
 654                         FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
 655                         WHERE rev_page = $pageId
 656                         AND rev_user != $user
 657                         GROUP BY rev_user, rev_user_text, user_real_name
 658                         ORDER BY timestamp DESC";
 659
 660                 if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
 661                 $sql .= ' '. $this->getSelectOptions();
 662
 663                 $res = $dbr->query($sql, $fname);
 664
 665                 while ( $line = $dbr->fetchObject( $res ) ) {
 666                         $contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
 667                 }
 668
 669                 $dbr->freeResult($res);
 670                 return $contribs;
 671         }
 672
 673         /**
 674          * This is the default action of the script: just view the page of
 675          * the given title.
 676         */
 677         function view() {
 678                 global $wgUser, $wgOut, $wgRequest, $wgOnlySysopsCanPatrol, $wgLang;
 679                 global $wgLinkCache, $IP, $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol;
 680                 global $wgEnotif, $wgParser, $wgParserCache;
 681                 $sk = $wgUser->getSkin();
 682
 683                 $fname = 'Article::view';
 684                 wfProfileIn( $fname );
 685                 # Get variables from query string
 686                 $oldid = $this->getOldID();
 687                 $diff = $wgRequest->getVal( 'diff' );
 688                 $rcid = $wgRequest->getVal( 'rcid' );
 689                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 690
 691                 $wgOut->setArticleFlag( true );
 692                 $wgOut->setRobotpolicy( 'index,follow' );
 693                 # If we got diff and oldid in the query, we want to see a
 694                 # diff page instead of the article.
 695
 696                 if ( !is_null( $diff ) ) {
 697                         require_once( 'DifferenceEngine.php' );
 698                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 699
 700                         $de = new DifferenceEngine( $oldid, $diff, $rcid );
 701                         // DifferenceEngine directly fetched the revision:
 702                         $this->mRevIdFetched = $de->mNewid;
 703                         $de->showDiffPage();
 704
 705                         if( $diff == 0 ) {
 706                                 # Run view updates for current revision only
 707                                 $this->viewUpdates();
 708                         }
 709                         wfProfileOut( $fname );
 710                         return;
 711                 }
 712
 713                 if ( empty( $oldid ) && $this->checkTouched() ) {
 714                         $wgOut->setETag($wgParserCache->getETag($this, $wgUser));
 715
 716                         if( $wgOut->checkLastModified( $this->mTouched ) ){
 717                                 wfProfileOut( $fname );
 718                                 return;
 719                         } else if ( $this->tryFileCache() ) {
 720                                 # tell wgOut that output is taken care of
 721                                 $wgOut->disable();
 722                                 $this->viewUpdates();
 723                                 wfProfileOut( $fname );
 724                                 return;
 725                         }
 726                 }
 727                 # Should the parser cache be used?
 728                 $pcache = $wgEnableParserCache &&
 729                         intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
 730                         $this->exists() &&
 731                         empty( $oldid );
 732                 wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
 733
 734                 $outputDone = false;
 735                 if ( $pcache ) {
 736                         if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
 737                                 $outputDone = true;
 738                         }
 739                 }
 740                 if ( !$outputDone ) {
 741                         $text = $this->getContent( false ); # May change mTitle by following a redirect
 742
 743                         # Another whitelist check in case oldid or redirects are altering the title
 744                         if ( !$this->mTitle->userCanRead() ) {
 745                                 $wgOut->loginToUse();
 746                                 $wgOut->output();
 747                                 exit;
 748                         }
 749
 750                         # We're looking at an old revision
 751
 752                         if ( !empty( $oldid ) ) {
 753                                 $this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
 754                                 $wgOut->setRobotpolicy( 'noindex,follow' );
 755                         }
 756                         if ( '' != $this->mRedirectedFrom ) {
 757                                 $sk = $wgUser->getSkin();
 758                                 $redir = $sk->makeKnownLink( $this->mRedirectedFrom, '',
 759                                   'redirect=no' );
 760                                 $s = wfMsg( 'redirectedfrom', $redir );
 761                                 $wgOut->setSubtitle( $s );
 762
 763                                 # Can't cache redirects
 764                                 $pcache = false;
 765                         } elseif ( !empty( $rdfrom ) ) {
 766                                 global $wgRedirectSources;
 767                                 if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 768                                         $sk = $wgUser->getSkin();
 769                                         $redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
 770                                         $s = wfMsg( 'redirectedfrom', $redir );
 771                                         $wgOut->setSubtitle( $s );
 772                                 }
 773                         }
 774
 775                         # wrap user css and user js in pre and don't parse
 776                         # XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
 777                         if (
 778                                 $this->mTitle->getNamespace() == NS_USER &&
 779                                 preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
 780                         ) {
 781                                 $wgOut->addWikiText( wfMsg('clearyourcache'));
 782                                 $wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
 783                         } else if ( $rt = Title::newFromRedirect( $text ) ) {
 784                                 # Display redirect
 785                                 $imageUrl = $wgStylePath.'/common/images/redirect.png';
 786                                 $targetUrl = $rt->escapeLocalURL();
 787                                 $titleText = htmlspecialchars( $rt->getPrefixedText() );
 788                                 $link = $sk->makeLinkObj( $rt );
 789
 790                                 $wgOut->addHTML( '<img valign="center" src="'.$imageUrl.'" alt="#REDIRECT" />' .
 791                                   '<span class="redirectText">'.$link.'</span>' );
 792
 793                                 $parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
 794                                 $catlinks = $parseout->getCategoryLinks();
 795                                 $wgOut->addCategoryLinks($catlinks);
 796                                 $skin = $wgUser->getSkin();
 797                         } else if ( $pcache ) {
 798                                 # Display content and save to parser cache
 799                                 $wgOut->addPrimaryWikiText( $text, $this );
 800                         } else {
 801                                 # Display content, don't attempt to save to parser cache
 802
 803                                 # Don't show section-edit links on old revisions... this way lies madness.
 804                                 if( !$this->isCurrent() ) {
 805                                         $oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
 806                                 }
 807                                 $wgOut->addWikiText( $text );
 808
 809                                 if( !$this->isCurrent() ) {
 810                                         $wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
 811                                 }
 812                         }
 813                 }
 814                 /* title may have been set from the cache */
 815                 $t = $wgOut->getPageTitle();
 816                 if( empty( $t ) ) {
 817                         $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
 818                 }
 819
 820                 # If we have been passed an &rcid= parameter, we want to give the user a
 821                 # chance to mark this new article as patrolled.
 822                 if ( $wgUseRCPatrol
 823                         && !is_null($rcid)
 824                         && $rcid != 0
 825                         && $wgUser->isLoggedIn()
 826                         && ( $wgUser->isAllowed('patrol') || !$wgOnlySysopsCanPatrol ) )
 827                 {
 828                         $wgOut->addHTML(
 829                                 "<div class='patrollink'>" .
 830                                         wfMsg ( 'markaspatrolledlink',
 831                                         $sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
 832                                         ) .
 833                                 '</div>'
 834                          );
 835                 }
 836
 837                 # Put link titles into the link cache
 838                 $wgOut->transformBuffer();
 839
 840                 # Add link titles as META keywords
 841                 $wgOut->addMetaTags() ;
 842
 843                 $this->viewUpdates();
 844                 wfProfileOut( $fname );
 845         }
 846
 847         function render() {
 848                 global $wgOut;
 849
 850                 $wgOut->setArticleBodyOnly(true);
 851                 $this->view();
 852         }
 853
 854         /**
 855          * Insert a new empty page record for this article.
 856          * This *must* be followed up by creating a revision
 857          * and running $this->updateToLatest( $rev_id );
 858          * or else the record will be left in a funky state.
 859          * Best if all done inside a transaction.
 860          *
 861          * @param Database $dbw
 862          * @param string   $restrictions
 863          * @return int     The newly created page_id key
 864          * @access private
 865          */
 866         function insertOn( &$dbw, $restrictions = '' ) {
 867                 $fname = 'Article::insertOn';
 868                 wfProfileIn( $fname );
 869
 870                 $page_id = $dbw->nextSequenceValue( 'page_page_id_seq' );
 871                 $dbw->insert( 'page', array(
 872                         'page_id'           => $page_id,
 873                         'page_namespace'    => $this->mTitle->getNamespace(),
 874                         'page_title'        => $this->mTitle->getDBkey(),
 875                         'page_counter'      => 0,
 876                         'page_restrictions' => $restrictions,
 877                         'page_is_redirect'  => 0, # Will set this shortly...
 878                         'page_is_new'       => 1,
 879                         'page_random'       => wfRandom(),
 880                         'page_touched'      => $dbw->timestamp(),
 881                         'page_latest'       => 0, # Fill this in shortly...
 882                 ), $fname );
 883                 $newid = $dbw->insertId();
 884
 885                 $this->mTitle->resetArticleId( $newid );
 886
 887                 wfProfileOut( $fname );
 888                 return $newid;
 889         }
 890
 891         /**
 892          * Update the page record to point to a newly saved revision.
 893          *
 894          * @param Database $dbw
 895          * @param Revision $revision -- for ID number, and text used to set
 896                                         length and redirect status fields
 897          * @param int $lastRevision -- if given, will not overwrite the page field
 898          *                             when different from the currently set value.
 899          *                             Giving 0 indicates the new page flag should
 900          *                             be set on.
 901          * @return bool true on success, false on failure
 902          * @access private
 903          */
 904         function updateRevisionOn( &$dbw, $revision, $lastRevision = null ) {
 905                 $fname = 'Article::updateToRevision';
 906                 wfProfileIn( $fname );
 907
 908                 $conditions = array( 'page_id' => $this->getId() );
 909                 if( !is_null( $lastRevision ) ) {
 910                         # An extra check against threads stepping on each other
 911                         $conditions['page_latest'] = $lastRevision;
 912                 }
 913                 $text = $revision->getText();
 914                 $dbw->update( 'page',
 915                         array( /* SET */
 916                                 'page_latest'      => $revision->getId(),
 917                                 'page_touched'     => $dbw->timestamp(),
 918                                 'page_is_new'      => ($lastRevision === 0) ? 1 : 0,
 919                                 'page_is_redirect' => Article::isRedirect( $text ),
 920                                 'page_len'         => strlen( $text ),
 921                         ),
 922                         $conditions,
 923                         $fname );
 924
 925                 wfProfileOut( $fname );
 926                 return ( $dbw->affectedRows() != 0 );
 927         }
 928
 929         /**
 930          * If the given revision is newer than the currently set page_latest,
 931          * update the page record. Otherwise, do nothing.
 932          *
 933          * @param Database $dbw
 934          * @param Revision $revision
 935          */
 936         function updateIfNewerOn( &$dbw, $revision ) {
 937                 $fname = 'Article::updateIfNewerOn';
 938                 wfProfileIn( $fname );
 939
 940                 $row = $dbw->selectRow(
 941                         array( 'revision', 'page' ),
 942                         array( 'rev_id', 'rev_timestamp' ),
 943                         array(
 944                                 'page_id' => $this->getId(),
 945                                 'page_latest=rev_id' ),
 946                         $fname );
 947                 if( $row ) {
 948                         if( $row->rev_timestamp >= $revision->getTimestamp() ) {
 949                                 wfProfileOut( $fname );
 950                                 return false;
 951                         }
 952                         $prev = $row->rev_id;
 953                 } else {
 954                         # No or missing previous revision; mark the page as new
 955                         $prev = 0;
 956                 }
 957
 958                 $ret = $this->updateRevisionOn( $dbw, $revision, $prev );
 959                 wfProfileOut( $fname );
 960                 return $ret;
 961         }
 962
 963         /**
 964          * Theoretically we could defer these whole insert and update
 965          * functions for after display, but that's taking a big leap
 966          * of faith, and we want to be able to report database
 967          * errors at some point.
 968          * @private
 969          */
 970         function insertNewArticle( $text, $summary, $isminor, $watchthis, $suppressRC=false, $comment=false ) {
 971                 global $wgOut, $wgUser;
 972                 global $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer;
 973
 974                 $fname = 'Article::insertNewArticle';
 975
 976                 $this->mGoodAdjustment = $this->isCountable( $text );
 977                 $this->mTotalAdjustment = 1;
 978
 979                 $ns = $this->mTitle->getNamespace();
 980                 $ttl = $this->mTitle->getDBkey();
 981
 982                 # If this is a comment, add the summary as headline
 983                 if($comment && $summary!="") {
 984                         $text="== {$summary} ==\n\n".$text;
 985                 }
 986                 $text = $this->preSaveTransform( $text );
 987                 $isminor = ( $isminor && $wgUser->isLoggedIn() ) ? 1 : 0;
 988                 $now = wfTimestampNow();
 989
 990                 $dbw =& wfGetDB( DB_MASTER );
 991
 992                 # Add the page record; stake our claim on this title!
 993                 $newid = $this->insertOn( $dbw );
 994
 995                 # Save the revision text...
 996                 $revision = new Revision( array(
 997                         'page'       => $newid,
 998                         'comment'    => $summary,
 999                         'minor_edit' => $isminor,
1000                         'text'       => $text
1001                         ) );
1002                 $revisionId = $revision->insertOn( $dbw );
1003
1004                 $this->mTitle->resetArticleID( $newid );
1005
1006                 # Update the page record with revision data
1007                 $this->updateRevisionOn( $dbw, $revision, 0 );
1008
1009                 Article::onArticleCreate( $this->mTitle );
1010                 if(!$suppressRC) {
1011                         RecentChange::notifyNew( $now, $this->mTitle, $isminor, $wgUser, $summary, 'default',
1012                           '', strlen( $text ), $revisionId );
1013                 }
1014
1015                 if ($watchthis) {
1016                         if(!$this->mTitle->userIsWatching()) $this->watch();
1017                 } else {
1018                         if ( $this->mTitle->userIsWatching() ) {
1019                                 $this->unwatch();
1020                         }
1021                 }
1022
1023                 # The talk page isn't in the regular link tables, so we need to update manually:
1024                 $talkns = $ns ^ 1; # talk -> normal; normal -> talk
1025                 $dbw->update( 'page',
1026                         array( 'page_touched' => $dbw->timestamp($now) ),
1027                         array( 'page_namespace' => $talkns,
1028                                'page_title' => $ttl ),
1029                         $fname );
1030
1031                 # standard deferred updates
1032                 $this->editUpdates( $text, $summary, $isminor, $now );
1033
1034                 $oldid = 0; # new article
1035                 $this->showArticle( $text, wfMsg( 'newarticle' ), false, $isminor, $now, $summary, $oldid );
1036         }
1037
1038         function getTextOfLastEditWithSectionReplacedOrAdded($section, $text, $summary = '', $edittime = NULL) {
1039                 $fname = 'Article::getTextOfLastEditWithSectionReplacedOrAdded';
1040                 if ($section != '') {
1041                         if( is_null( $edittime ) ) {
1042                                 $rev = Revision::newFromTitle( $this->mTitle );
1043                         } else {
1044                                 $dbw =& wfGetDB( DB_MASTER );
1045                                 $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
1046                         }
1047                         $oldtext = $rev->getText();
1048
1049                         if($section=='new') {
1050                                 if($summary) $subject="== {$summary} ==\n\n";
1051                                 $text=$oldtext."\n\n".$subject.$text;
1052                         } else {
1053
1054                                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
1055                                 # comments to be stripped as well)
1056                                 $striparray=array();
1057                                 $parser=new Parser();
1058                                 $parser->mOutputType=OT_WIKI;
1059                                 $oldtext=$parser->strip($oldtext, $striparray, true);
1060
1061                                 # now that we can be sure that no pseudo-sections are in the source,
1062                                 # split it up
1063                                 # Unfortunately we can't simply do a preg_replace because that might
1064                                 # replace the wrong section, so we have to use the section counter instead
1065                                 $secs=preg_split('/(^=+.+?=+|^<h[1-6].*?' . '>.*?<\/h[1-6].*?' . '>)(?!\S)/mi',
1066                                   $oldtext,-1,PREG_SPLIT_DELIM_CAPTURE);
1067                                 $secs[$section*2]=$text."\n\n"; // replace with edited
1068
1069                                 # section 0 is top (intro) section
1070                                 if($section!=0) {
1071
1072                                         # headline of old section - we need to go through this section
1073                                         # to determine if there are any subsections that now need to
1074                                         # be erased, as the mother section has been replaced with
1075                                         # the text of all subsections.
1076                                         $headline=$secs[$section*2-1];
1077                                         preg_match( '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$headline,$matches);
1078                                         $hlevel=$matches[1];
1079
1080                                         # determine headline level for wikimarkup headings
1081                                         if(strpos($hlevel,'=')!==false) {
1082                                                 $hlevel=strlen($hlevel);
1083                                         }
1084
1085                                         $secs[$section*2-1]=''; // erase old headline
1086                                         $count=$section+1;
1087                                         $break=false;
1088                                         while(!empty($secs[$count*2-1]) && !$break) {
1089
1090                                                 $subheadline=$secs[$count*2-1];
1091                                                 preg_match(
1092                                                  '/^(=+).+?=+|^<h([1-6]).*?' . '>.*?<\/h[1-6].*?' . '>(?!\S)/mi',$subheadline,$matches);
1093                                                 $subhlevel=$matches[1];
1094                                                 if(strpos($subhlevel,'=')!==false) {
1095                                                         $subhlevel=strlen($subhlevel);
1096                                                 }
1097                                                 if($subhlevel > $hlevel) {
1098                                                         // erase old subsections
1099                                                         $secs[$count*2-1]='';
1100                                                         $secs[$count*2]='';
1101                                                 }
1102                                                 if($subhlevel <= $hlevel) {
1103                                                         $break=true;
1104                                                 }
1105                                                 $count++;
1106
1107                                         }
1108
1109                                 }
1110                                 $text=join('',$secs);
1111                                 # reinsert the stuff that we stripped out earlier
1112                                 $text=$parser->unstrip($text,$striparray);
1113                                 $text=$parser->unstripNoWiki($text,$striparray);
1114                         }
1115
1116                 }
1117                 return $text;
1118         }
1119
1120         /**
1121          * Change an existing article. Puts the previous version back into the old table, updates RC
1122          * and all necessary caches, mostly via the deferred update array.
1123          *
1124          * It is possible to call this function from a command-line script, but note that you should
1125          * first set $wgUser, and clean up $wgDeferredUpdates after each edit.
1126          */
1127         function updateArticle( $text, $summary, $minor, $watchthis, $forceBot = false, $sectionanchor = '' ) {
1128                 global $wgOut, $wgUser;
1129                 global $wgDBtransactions, $wgMwRedir;
1130                 global $wgUseSquid, $wgInternalServer, $wgPostCommitUpdateList;
1131
1132                 $fname = 'Article::updateArticle';
1133                 $good = true;
1134
1135                 $isminor = ( $minor && $wgUser->isLoggedIn() );
1136                 if ( $this->isRedirect( $text ) ) {
1137                         # Remove all content but redirect
1138                         # This could be done by reconstructing the redirect from a title given by
1139                         # Title::newFromRedirect(), but then we wouldn't know which synonym the user
1140                         # wants to see
1141                         if ( preg_match( "/^((" . $wgMwRedir->getBaseRegex() . ')[^\\n]+)/i', $text, $m ) ) {
1142                                 $redir = 1;
1143                                 $text = $m[1] . "\n";
1144                         }
1145                 }
1146                 else { $redir = 0; }
1147
1148                 $text = $this->preSaveTransform( $text );
1149                 $dbw =& wfGetDB( DB_MASTER );
1150                 $now = wfTimestampNow();
1151
1152                 # Update article, but only if changed.
1153
1154                 # It's important that we either rollback or complete, otherwise an attacker could
1155                 # overwrite cur entries by sending precisely timed user aborts. Random bored users
1156                 # could conceivably have the same effect, especially if cur is locked for long periods.
1157                 if( !$wgDBtransactions ) {
1158                         $userAbort = ignore_user_abort( true );
1159                 }
1160
1161                 $oldtext = $this->getContent( true );
1162                 $oldsize = strlen( $oldtext );
1163                 $newsize = strlen( $text );
1164                 $lastRevision = 0;
1165
1166                 if ( 0 != strcmp( $text, $oldtext ) ) {
1167                         $this->mGoodAdjustment = $this->isCountable( $text )
1168                           - $this->isCountable( $oldtext );
1169                         $this->mTotalAdjustment = 0;
1170                         $now = wfTimestampNow();
1171
1172                         $lastRevision = $dbw->selectField(
1173                                 'page', 'page_latest', array( 'page_id' => $this->getId() ) );
1174
1175                         $revision = new Revision( array(
1176                                 'page'       => $this->getId(),
1177                                 'comment'    => $summary,
1178                                 'minor_edit' => $isminor,
1179                                 'text'       => $text
1180                                 ) );
1181                         $revisionId = $revision->insertOn( $dbw );
1182
1183                         # Update page
1184                         $ok = $this->updateRevisionOn( $dbw, $revision, $lastRevision );
1185
1186                         if( !$ok ) {
1187                                 /* Belated edit conflict! Run away!! */
1188                                 $good = false;
1189                         } else {
1190                                 # Update recentchanges and purge cache and whatnot
1191                                 $bot = (int)($wgUser->isBot() || $forceBot);
1192                                 RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $wgUser, $summary,
1193                                         $lastRevision, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
1194                                         $revisionId );
1195                                 Article::onArticleEdit( $this->mTitle );
1196                         }
1197                 }
1198
1199                 if( !$wgDBtransactions ) {
1200                         ignore_user_abort( $userAbort );
1201                 }
1202
1203                 if ( $good ) {
1204                         if ($watchthis) {
1205                                 if (!$this->mTitle->userIsWatching()) $this->watch();
1206                         } else {
1207                                 if ( $this->mTitle->userIsWatching() ) {
1208                                         $this->unwatch();
1209                                 }
1210                         }
1211                         # standard deferred updates
1212                         $this->editUpdates( $text, $summary, $minor, $now );
1213
1214
1215                         $urls = array();
1216                         # Template namespace
1217                         # Purge all articles linking here
1218                         if ( $this->mTitle->getNamespace() == NS_TEMPLATE) {
1219                                 $titles = $this->mTitle->getLinksTo();
1220                                 Title::touchArray( $titles );
1221                                 if ( $wgUseSquid ) {
1222                                                 foreach ( $titles as $title ) {
1223                                                         $urls[] = $title->getInternalURL();
1224                                                 }
1225                                 }
1226                         }
1227
1228                         # Squid updates
1229                         if ( $wgUseSquid ) {
1230                                 $urls = array_merge( $urls, $this->mTitle->getSquidURLs() );
1231                                 $u = new SquidUpdate( $urls );
1232                                 array_push( $wgPostCommitUpdateList, $u );
1233                         }
1234
1235                         $this->showArticle( $text, wfMsg( 'updated' ), $sectionanchor, $isminor, $now, $summary, $lastRevision );
1236                 }
1237                 return $good;
1238         }
1239
1240         /**
1241          * After we've either updated or inserted the article, update
1242          * the link tables and redirect to the new page.
1243          */
1244         function showArticle( $text, $subtitle , $sectionanchor = '', $me2, $now, $summary, $oldid ) {
1245                 global $wgUseDumbLinkUpdate, $wgAntiLockFlags, $wgOut, $wgUser, $wgLinkCache, $wgEnotif;
1246                 global $wgUseEnotif;
1247
1248                 $wgLinkCache = new LinkCache();
1249
1250                 if ( !$wgUseDumbLinkUpdate ) {
1251                         # Preload links to reduce lock time
1252                         if ( $wgAntiLockFlags & ALF_PRELOAD_LINKS ) {
1253                                 $wgLinkCache->preFill( $this->mTitle );
1254                                 $wgLinkCache->clear();
1255                         }
1256                 }
1257
1258                 # Parse the text and replace links with placeholders
1259                 $wgOut = new OutputPage();
1260
1261                 # Pass the current title along in case we're creating a wiki page
1262                 # which is different than the currently displayed one (e.g. image
1263                 # pages created on file uploads); otherwise, link updates will
1264                 # go wrong.
1265                 $wgOut->addWikiTextWithTitle( $text, $this->mTitle );
1266
1267                 if ( !$wgUseDumbLinkUpdate ) {
1268                         # Move the current links back to the second register
1269                         $wgLinkCache->swapRegisters();
1270
1271                         # Get old version of link table to allow incremental link updates
1272                         # Lock this data now since it is needed for an update
1273                         $wgLinkCache->forUpdate( true );
1274                         $wgLinkCache->preFill( $this->mTitle );
1275
1276                         # Swap this old version back into its rightful place
1277                         $wgLinkCache->swapRegisters();
1278                 }
1279
1280                 if( $this->isRedirect( $text ) )
1281                         $r = 'redirect=no';
1282                 else
1283                         $r = '';
1284                 $wgOut->redirect( $this->mTitle->getFullURL( $r ).$sectionanchor );
1285
1286                 if ( $wgUseEnotif  ) {
1287                         # this would be better as an extension hook
1288                         include_once( "UserMailer.php" );
1289                         $wgEnotif = new EmailNotification ();
1290                         $wgEnotif->notifyOnPageChange( $this->mTitle, $now, $summary, $me2, $oldid );
1291                 }
1292         }
1293
1294         /**
1295          * Mark this particular edit as patrolled
1296          */
1297         function markpatrolled() {
1298                 global $wgOut, $wgRequest, $wgOnlySysopsCanPatrol, $wgUseRCPatrol, $wgUser;
1299                 $wgOut->setRobotpolicy( 'noindex,follow' );
1300
1301                 if ( !$wgUseRCPatrol )
1302                 {
1303                         $wgOut->errorpage( 'rcpatroldisabled', 'rcpatroldisabledtext' );
1304                         return;
1305                 }
1306                 if ( $wgUser->isAnon() )
1307                 {
1308                         $wgOut->loginToUse();
1309                         return;
1310                 }
1311                 if ( $wgOnlySysopsCanPatrol && !$wgUser->isAllowed('patrol') )
1312                 {
1313                         $wgOut->sysopRequired();
1314                         return;
1315                 }
1316                 $rcid = $wgRequest->getVal( 'rcid' );
1317                 if ( !is_null ( $rcid ) )
1318                 {
1319                         RecentChange::markPatrolled( $rcid );
1320                         $wgOut->setPagetitle( wfMsg( 'markedaspatrolled' ) );
1321                         $wgOut->addWikiText( wfMsg( 'markedaspatrolledtext' ) );
1322
1323                         $rcTitle = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
1324                         $wgOut->returnToMain( false, $rcTitle->getPrefixedText() );
1325                 }
1326                 else
1327                 {
1328                         $wgOut->errorpage( 'markedaspatrollederror', 'markedaspatrollederrortext' );
1329                 }
1330         }
1331
1332         /**
1333          * Validate function
1334          */
1335         function validate() {
1336                 global $wgOut, $wgUser, $wgRequest, $wgUseValidation;
1337
1338                 if ( !$wgUseValidation ) # Are we using article validation at all?
1339                 {
1340                         $wgOut->errorpage( "nosuchspecialpage", "nospecialpagetext" );
1341                         return ;
1342                 }
1343
1344                 $wgOut->setRobotpolicy( 'noindex,follow' );
1345                 $revision = $wgRequest->getVal( 'revision' );
1346
1347                 include_once ( "SpecialValidate.php" ) ; # The "Validation" class
1348
1349                 $v = new Validation ;
1350                 if ( $wgRequest->getVal ( "mode" , "" ) == "list" )
1351                         $t = $v->showList ( $this ) ;
1352                 else if ( $wgRequest->getVal ( "mode" , "" ) == "details" )
1353                         $t = $v->showDetails ( $this , $wgRequest->getVal( 'revision' ) ) ;
1354                 else
1355                         $t = $v->validatePageForm ( $this , $revision ) ;
1356
1357                 $wgOut->addHTML ( $t ) ;
1358         }
1359
1360         /**
1361          * Add this page to $wgUser's watchlist
1362          */
1363
1364         function watch() {
1365
1366                 global $wgUser, $wgOut;
1367
1368                 if ( $wgUser->isAnon() ) {
1369                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1370                         return;
1371                 }
1372                 if ( wfReadOnly() ) {
1373                         $wgOut->readOnlyPage();
1374                         return;
1375                 }
1376
1377                 if (wfRunHooks('WatchArticle', array(&$wgUser, &$this))) {
1378
1379                         $wgUser->addWatch( $this->mTitle );
1380                         $wgUser->saveSettings();
1381
1382                         wfRunHooks('WatchArticleComplete', array(&$wgUser, &$this));
1383
1384                         $wgOut->setPagetitle( wfMsg( 'addedwatch' ) );
1385                         $wgOut->setRobotpolicy( 'noindex,follow' );
1386
1387                         $link = $this->mTitle->getPrefixedText();
1388                         $text = wfMsg( 'addedwatchtext', $link );
1389                         $wgOut->addWikiText( $text );
1390                 }
1391
1392                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1393         }
1394
1395         /**
1396          * Stop watching a page
1397          */
1398
1399         function unwatch() {
1400
1401                 global $wgUser, $wgOut;
1402
1403                 if ( $wgUser->isAnon() ) {
1404                         $wgOut->errorpage( 'watchnologin', 'watchnologintext' );
1405                         return;
1406                 }
1407                 if ( wfReadOnly() ) {
1408                         $wgOut->readOnlyPage();
1409                         return;
1410                 }
1411
1412                 if (wfRunHooks('UnwatchArticle', array(&$wgUser, &$this))) {
1413
1414                         $wgUser->removeWatch( $this->mTitle );
1415                         $wgUser->saveSettings();
1416
1417                         wfRunHooks('UnwatchArticleComplete', array(&$wgUser, &$this));
1418
1419                         $wgOut->setPagetitle( wfMsg( 'removedwatch' ) );
1420                         $wgOut->setRobotpolicy( 'noindex,follow' );
1421
1422                         $link = $this->mTitle->getPrefixedText();
1423                         $text = wfMsg( 'removedwatchtext', $link );
1424                         $wgOut->addWikiText( $text );
1425                 }
1426
1427                 $wgOut->returnToMain( true, $this->mTitle->getPrefixedText() );
1428         }
1429
1430         /**
1431          * protect a page
1432          */
1433         function protect( $limit = 'sysop' ) {
1434                 global $wgUser, $wgOut, $wgRequest;
1435
1436                 if ( ! $wgUser->isAllowed('protect') ) {
1437                         $wgOut->sysopRequired();
1438                         return;
1439                 }
1440                 if ( wfReadOnly() ) {
1441                         $wgOut->readOnlyPage();
1442                         return;
1443                 }
1444                 $id = $this->mTitle->getArticleID();
1445                 if ( 0 == $id ) {
1446                         $wgOut->fatalError( wfMsg( 'badarticleerror' ) );
1447                         return;
1448                 }
1449
1450                 $confirm = $wgRequest->wasPosted() &&
1451                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1452                 $moveonly = $wgRequest->getBool( 'wpMoveOnly' );
1453                 $reason = $wgRequest->getText( 'wpReasonProtect' );
1454
1455                 if ( $confirm ) {
1456                         $dbw =& wfGetDB( DB_MASTER );
1457                         $dbw->update( 'page',
1458                                 array( /* SET */
1459                                         'page_touched' => $dbw->timestamp(),
1460                                         'page_restrictions' => (string)$limit
1461                                 ), array( /* WHERE */
1462                                         'page_id' => $id
1463                                 ), 'Article::protect'
1464                         );
1465
1466                         $restrictions = "move=" . $limit;
1467                         if( !$moveonly ) {
1468                                 $restrictions .= ":edit=" . $limit;
1469                         }
1470                         if (wfRunHooks('ArticleProtect', array(&$this, &$wgUser, $limit == 'sysop', $reason, $moveonly))) {
1471
1472                                 $dbw =& wfGetDB( DB_MASTER );
1473                                 $dbw->update( 'page',
1474                                                           array( /* SET */
1475                                                                          'page_touched' => $dbw->timestamp(),
1476                                                                          'page_restrictions' => $restrictions
1477                                                                          ), array( /* WHERE */
1478                                                                                            'page_id' => $id
1479                                                                                            ), 'Article::protect'
1480                                                           );
1481
1482                                 wfRunHooks('ArticleProtectComplete', array(&$this, &$wgUser, $limit == 'sysop', $reason, $moveonly));
1483
1484                                 $log = new LogPage( 'protect' );
1485                                 if ( $limit === '' ) {
1486                                         $log->addEntry( 'unprotect', $this->mTitle, $reason );
1487                                 } else {
1488                                         $log->addEntry( 'protect', $this->mTitle, $reason );
1489                                 }
1490                                 $wgOut->redirect( $this->mTitle->getFullURL() );
1491                         }
1492                         return;
1493                 } else {
1494                         $reason = htmlspecialchars( wfMsg( 'protectreason' ) );
1495                         return $this->confirmProtect( '', $reason, $limit );
1496                 }
1497         }
1498
1499         /**
1500          * Output protection confirmation dialog
1501          */
1502         function confirmProtect( $par, $reason, $limit = 'sysop'  ) {
1503                 global $wgOut, $wgUser;
1504
1505                 wfDebug( "Article::confirmProtect\n" );
1506
1507                 $sub = $this->mTitle->getPrefixedText();
1508                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1509
1510                 $check = '';
1511                 $protcom = '';
1512                 $moveonly = '';
1513
1514                 if ( $limit === '' ) {
1515                         $wgOut->setPageTitle( wfMsg( 'confirmunprotect' ) );
1516                         $wgOut->setSubtitle( wfMsg( 'unprotectsub', $sub ) );
1517                         $wgOut->addWikiText( wfMsg( 'confirmunprotecttext' ) );
1518                         $protcom = htmlspecialchars( wfMsg( 'unprotectcomment' ) );
1519                         $formaction = $this->mTitle->escapeLocalURL( 'action=unprotect' . $par );
1520                 } else {
1521                         $wgOut->setPageTitle( wfMsg( 'confirmprotect' ) );
1522                         $wgOut->setSubtitle( wfMsg( 'protectsub', $sub ) );
1523                         $wgOut->addWikiText( wfMsg( 'confirmprotecttext' ) );
1524                         $moveonly = htmlspecialchars( wfMsg( 'protectmoveonly' ) );
1525                         $protcom = htmlspecialchars( wfMsg( 'protectcomment' ) );
1526                         $formaction = $this->mTitle->escapeLocalURL( 'action=protect' . $par );
1527                 }
1528
1529                 $confirm = htmlspecialchars( wfMsg( 'confirm' ) );
1530                 $token = htmlspecialchars( $wgUser->editToken() );
1531
1532                 $wgOut->addHTML( "
1533 <form id='protectconfirm' method='post' action=\"{$formaction}\">
1534         <table border='0'>
1535                 <tr>
1536                         <td align='right'>
1537                                 <label for='wpReasonProtect'>{$protcom}:</label>
1538                         </td>
1539                         <td align='left'>
1540                                 <input type='text' size='60' name='wpReasonProtect' id='wpReasonProtect' value=\"" . htmlspecialchars( $reason ) . "\" />
1541                         </td>
1542                 </tr>" );
1543                 if($moveonly != '') {
1544                         $wgOut->AddHTML( "
1545                 <tr>
1546                         <td align='right'>
1547                                 <input type='checkbox' name='wpMoveOnly' value='1' id='wpMoveOnly' />
1548                         </td>
1549                         <td align='left'>
1550                                 <label for='wpMoveOnly'>{$moveonly}</label>
1551                         </td>
1552                 </tr> " );
1553                 }
1554                 $wgOut->addHTML( "
1555                 <tr>
1556                         <td>&nbsp;</td>
1557                         <td>
1558                                 <input type='submit' name='wpConfirmProtectB' value=\"{$confirm}\" />
1559                         </td>
1560                 </tr>
1561         </table>
1562         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1563 </form>" );
1564
1565                 $wgOut->returnToMain( false );
1566         }
1567
1568         /**
1569          * Unprotect the pages
1570          */
1571         function unprotect() {
1572                 return $this->protect( '' );
1573         }
1574
1575         /*
1576          * UI entry point for page deletion
1577          */
1578         function delete() {
1579                 global $wgUser, $wgOut, $wgMessageCache, $wgRequest;
1580                 $fname = 'Article::delete';
1581                 $confirm = $wgRequest->wasPosted() &&
1582                         $wgUser->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1583                 $reason = $wgRequest->getText( 'wpReason' );
1584
1585                 # This code desperately needs to be totally rewritten
1586
1587                 # Check permissions
1588                 if( ( !$wgUser->isAllowed( 'delete' ) ) ) {
1589                         $wgOut->sysopRequired();
1590                         return;
1591                 }
1592                 if( wfReadOnly() ) {
1593                         $wgOut->readOnlyPage();
1594                         return;
1595                 }
1596
1597                 # Better double-check that it hasn't been deleted yet!
1598                 $wgOut->setPagetitle( wfMsg( 'confirmdelete' ) );
1599                 if( !$this->mTitle->exists() ) {
1600                         $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1601                         return;
1602                 }
1603
1604                 if( $confirm ) {
1605                         $this->doDelete( $reason );
1606                         return;
1607                 }
1608
1609                 # determine whether this page has earlier revisions
1610                 # and insert a warning if it does
1611                 # we select the text because it might be useful below
1612                 $dbr =& $this->getDB();
1613                 $ns = $this->mTitle->getNamespace();
1614                 $title = $this->mTitle->getDBkey();
1615                 $revisions = $dbr->select( array( 'page', 'revision' ),
1616                         array( 'rev_id', 'rev_user_text' ),
1617                         array(
1618                                 'page_namespace' => $ns,
1619                                 'page_title' => $title,
1620                                 'rev_page = page_id'
1621                         ), $fname, $this->getSelectOptions( array( 'ORDER BY' => 'rev_timestamp DESC' ) )
1622                 );
1623
1624                 if( $dbr->numRows( $revisions ) > 1 && !$confirm ) {
1625                         $skin=$wgUser->getSkin();
1626                         $wgOut->addHTML('<b>'.wfMsg('historywarning'));
1627                         $wgOut->addHTML( $skin->historyLink() .'</b>');
1628                 }
1629
1630                 # Fetch cur_text
1631                 $rev =& Revision::newFromTitle( $this->mTitle );
1632
1633                 # Fetch name(s) of contributors
1634                 $rev_name = '';
1635                 $all_same_user = true;
1636                 while( $row = $dbr->fetchObject( $revisions ) ) {
1637                         if( $rev_name != '' && $rev_name != $row->rev_user_text ) {
1638                                 $all_same_user = false;
1639                         } else {
1640                                 $rev_name = $row->rev_user_text;
1641                         }
1642                 }
1643
1644                 if( !is_null( $rev ) ) {
1645                         # if this is a mini-text, we can paste part of it into the deletion reason
1646                         $text = $rev->getText();
1647
1648                         #if this is empty, an earlier revision may contain "useful" text
1649                         $blanked = false;
1650                         if( $text == '' ) {
1651                                 $prev = $rev->getPrevious();
1652                                 if( $prev ) {
1653                                         $text = $prev->getText();
1654                                         $blanked = true;
1655                                 }
1656                         }
1657
1658                         $length = strlen( $text );
1659
1660                         # this should not happen, since it is not possible to store an empty, new
1661                         # page. Let's insert a standard text in case it does, though
1662                         if( $length == 0 && $reason === '' ) {
1663                                 $reason = wfMsg( 'exblank' );
1664                         }
1665
1666                         if( $length < 500 && $reason === '' ) {
1667                                 # comment field=255, let's grep the first 150 to have some user
1668                                 # space left
1669                                 global $wgContLang;
1670                                 $text = $wgContLang->truncate( $text, 150, '...' );
1671
1672                                 # let's strip out newlines
1673                                 $text = preg_replace( "/[\n\r]/", '', $text );
1674
1675                                 if( !$blanked ) {
1676                                         if( !$all_same_user ) {
1677                                                 $reason = wfMsg( 'excontent', $text );
1678                                         } else {
1679                                                 $reason = wfMsg( 'excontentauthor', $text, $rev_name );
1680                                         }
1681                                 } else {
1682                                         $reason = wfMsg( 'exbeforeblank', $text );
1683                                 }
1684                         }
1685                 }
1686
1687                 return $this->confirmDelete( '', $reason );
1688         }
1689
1690         /**
1691          * Output deletion confirmation dialog
1692          */
1693         function confirmDelete( $par, $reason ) {
1694                 global $wgOut, $wgUser;
1695
1696                 wfDebug( "Article::confirmDelete\n" );
1697
1698                 $sub = htmlspecialchars( $this->mTitle->getPrefixedText() );
1699                 $wgOut->setSubtitle( wfMsg( 'deletesub', $sub ) );
1700                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1701                 $wgOut->addWikiText( wfMsg( 'confirmdeletetext' ) );
1702
1703                 $formaction = $this->mTitle->escapeLocalURL( 'action=delete' . $par );
1704
1705                 $confirm = htmlspecialchars( wfMsg( 'confirm' ) );
1706                 $delcom = htmlspecialchars( wfMsg( 'deletecomment' ) );
1707                 $token = htmlspecialchars( $wgUser->editToken() );
1708
1709                 $wgOut->addHTML( "
1710 <form id='deleteconfirm' method='post' action=\"{$formaction}\">
1711         <table border='0'>
1712                 <tr>
1713                         <td align='right'>
1714                                 <label for='wpReason'>{$delcom}:</label>
1715                         </td>
1716                         <td align='left'>
1717                                 <input type='text' size='60' name='wpReason' id='wpReason' value=\"" . htmlspecialchars( $reason ) . "\" />
1718                         </td>
1719                 </tr>
1720                 <tr>
1721                         <td>&nbsp;</td>
1722                         <td>
1723                                 <input type='submit' name='wpConfirmB' value=\"{$confirm}\" />
1724                         </td>
1725                 </tr>
1726         </table>
1727         <input type='hidden' name='wpEditToken' value=\"{$token}\" />
1728 </form>\n" );
1729
1730                 $wgOut->returnToMain( false );
1731         }
1732
1733
1734         /**
1735          * Perform a deletion and output success or failure messages
1736          */
1737         function doDelete( $reason ) {
1738                 global $wgOut, $wgUser, $wgContLang;
1739                 $fname = 'Article::doDelete';
1740                 wfDebug( $fname."\n" );
1741
1742                 if (wfRunHooks('ArticleDelete', array(&$this, &$wgUser, &$reason))) {
1743                         if ( $this->doDeleteArticle( $reason ) ) {
1744                                 $deleted = $this->mTitle->getPrefixedText();
1745
1746                                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1747                                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1748
1749                                 $loglink = '[[Special:Log/delete|' . wfMsg( 'deletionlog' ) . ']]';
1750                                 $text = wfMsg( 'deletedtext', $deleted, $loglink );
1751
1752                                 $wgOut->addWikiText( $text );
1753                                 $wgOut->returnToMain( false );
1754                                 wfRunHooks('ArticleDeleteComplete', array(&$this, &$wgUser, $reason));
1755                         } else {
1756                                 $wgOut->fatalError( wfMsg( 'cannotdelete' ) );
1757                         }
1758                 }
1759         }
1760
1761         /**
1762          * Back-end article deletion
1763          * Deletes the article with database consistency, writes logs, purges caches
1764          * Returns success
1765          */
1766         function doDeleteArticle( $reason ) {
1767                 global $wgUser;
1768                 global  $wgUseSquid, $wgDeferredUpdateList, $wgInternalServer, $wgPostCommitUpdateList;
1769
1770                 $fname = 'Article::doDeleteArticle';
1771                 wfDebug( $fname."\n" );
1772
1773                 $dbw =& wfGetDB( DB_MASTER );
1774                 $ns = $this->mTitle->getNamespace();
1775                 $t = $this->mTitle->getDBkey();
1776                 $id = $this->mTitle->getArticleID();
1777
1778                 if ( $t == '' || $id == 0 ) {
1779                         return false;
1780                 }
1781
1782                 $u = new SiteStatsUpdate( 0, 1, -$this->isCountable( $this->getContent( true ) ), -1 );
1783                 array_push( $wgDeferredUpdateList, $u );
1784
1785                 $linksTo = $this->mTitle->getLinksTo();
1786
1787                 # Squid purging
1788                 if ( $wgUseSquid ) {
1789                         $urls = array(
1790                                 $this->mTitle->getInternalURL(),
1791                                 $this->mTitle->getInternalURL( 'history' )
1792                         );
1793
1794                         $u = SquidUpdate::newFromTitles( $linksTo, $urls );
1795                         array_push( $wgPostCommitUpdateList, $u );
1796
1797                 }
1798
1799                 # Client and file cache invalidation
1800                 Title::touchArray( $linksTo );
1801
1802
1803                 // For now, shunt the revision data into the archive table.
1804                 // Text is *not* removed from the text table; bulk storage
1805                 // is left intact to avoid breaking block-compression or
1806                 // immutable storage schemes.
1807                 //
1808                 // For backwards compatibility, note that some older archive
1809                 // table entries will have ar_text and ar_flags fields still.
1810                 //
1811                 // In the future, we may keep revisions and mark them with
1812                 // the rev_deleted field, which is reserved for this purpose.
1813                 $dbw->insertSelect( 'archive', array( 'page', 'revision' ),
1814                         array(
1815                                 'ar_namespace'  => 'page_namespace',
1816                                 'ar_title'      => 'page_title',
1817                                 'ar_comment'    => 'rev_comment',
1818                                 'ar_user'       => 'rev_user',
1819                                 'ar_user_text'  => 'rev_user_text',
1820                                 'ar_timestamp'  => 'rev_timestamp',
1821                                 'ar_minor_edit' => 'rev_minor_edit',
1822                                 'ar_rev_id'     => 'rev_id',
1823                                 'ar_text_id'    => 'rev_text_id',
1824                         ), array(
1825                                 'page_id' => $id,
1826                                 'page_id = rev_page'
1827                         ), $fname
1828                 );
1829
1830                 # Now that it's safely backed up, delete it
1831                 $dbw->delete( 'revision', array( 'rev_page' => $id ), $fname );
1832                 $dbw->delete( 'page', array( 'page_id' => $id ), $fname);
1833
1834                 # Clean up recentchanges entries...
1835                 $dbw->delete( 'recentchanges', array( 'rc_namespace' => $ns, 'rc_title' => $t ), $fname );
1836
1837                 # Finally, clean up the link tables
1838                 $t = $this->mTitle->getPrefixedDBkey();
1839
1840                 Article::onArticleDelete( $this->mTitle );
1841
1842                 # Delete outgoing links
1843                 $dbw->delete( 'pagelinks', array( 'pl_from' => $id ) );
1844                 $dbw->delete( 'imagelinks', array( 'il_from' => $id ) );
1845                 $dbw->delete( 'categorylinks', array( 'cl_from' => $id ) );
1846
1847                 # Log the deletion
1848                 $log = new LogPage( 'delete' );
1849                 $log->addEntry( 'delete', $this->mTitle, $reason );
1850
1851                 # Clear the cached article id so the interface doesn't act like we exist
1852                 $this->mTitle->resetArticleID( 0 );
1853                 $this->mTitle->mArticleID = 0;
1854                 return true;
1855         }
1856
1857         /**
1858          * Revert a modification
1859          */
1860         function rollback() {
1861                 global $wgUser, $wgOut, $wgRequest;
1862                 $fname = 'Article::rollback';
1863
1864                 if ( ! $wgUser->isAllowed('rollback') ) {
1865                         $wgOut->sysopRequired();
1866                         return;
1867                 }
1868                 if ( wfReadOnly() ) {
1869                         $wgOut->readOnlyPage( $this->getContent( true ) );
1870                         return;
1871                 }
1872                 if( !$wgUser->matchEditToken( $wgRequest->getVal( 'token' ),
1873                         array( $this->mTitle->getPrefixedText(),
1874                                 $wgRequest->getVal( 'from' ) )  ) ) {
1875                         $wgOut->setPageTitle( wfMsg( 'rollbackfailed' ) );
1876                         $wgOut->addWikiText( wfMsg( 'sessionfailure' ) );
1877                         return;
1878                 }
1879                 $dbw =& wfGetDB( DB_MASTER );
1880
1881                 # Enhanced rollback, marks edits rc_bot=1
1882                 $bot = $wgRequest->getBool( 'bot' );
1883
1884                 # Replace all this user's current edits with the next one down
1885                 $tt = $this->mTitle->getDBKey();
1886                 $n = $this->mTitle->getNamespace();
1887
1888                 # Get the last editor, lock table exclusively
1889                 $dbw->begin();
1890                 $current = Revision::newFromTitle( $this->mTitle );
1891                 if( is_null( $current ) ) {
1892                         # Something wrong... no page?
1893                         $dbw->rollback();
1894                         $wgOut->addHTML( wfMsg( 'notanarticle' ) );
1895                         return;
1896                 }
1897
1898                 $from = str_replace( '_', ' ', $wgRequest->getVal( 'from' ) );
1899                 if( $from != $current->getUserText() ) {
1900                         $wgOut->setPageTitle(wfmsg('rollbackfailed'));
1901                         $wgOut->addWikiText( wfMsg( 'alreadyrolled',
1902                                 htmlspecialchars( $this->mTitle->getPrefixedText()),
1903                                 htmlspecialchars( $from ),
1904                                 htmlspecialchars( $current->getUserText() ) ) );
1905                         if( $current->getComment() != '') {
1906                                 $wgOut->addHTML(
1907                                         wfMsg( 'editcomment',
1908                                         htmlspecialchars( $current->getComment() ) ) );
1909                         }
1910                         return;
1911                 }
1912
1913                 # Get the last edit not by this guy
1914                 $user = IntVal( $current->getUser() );
1915                 $user_text = $dbw->addQuotes( $current->getUserText() );
1916                 $s = $dbw->selectRow( 'revision',
1917                         array( 'rev_id', 'rev_timestamp' ),
1918                         array(
1919                                 'rev_page' => $current->getPage(),
1920                                 "rev_user <> {$user} OR rev_user_text <> {$user_text}"
1921                         ), $fname,
1922                         array(
1923                                 'USE INDEX' => 'page_timestamp',
1924                                 'ORDER BY'  => 'rev_timestamp DESC' )
1925                         );
1926                 if( $s === false ) {
1927                         # Something wrong
1928                         $dbw->rollback();
1929                         $wgOut->setPageTitle(wfMsg('rollbackfailed'));
1930                         $wgOut->addHTML( wfMsg( 'cantrollback' ) );
1931                         return;
1932                 }
1933
1934                 if ( $bot ) {
1935                         # Mark all reverted edits as bot
1936                         $dbw->update( 'recentchanges',
1937                                 array( /* SET */
1938                                         'rc_bot' => 1
1939                                 ), array( /* WHERE */
1940                                         'rc_cur_id'    => $current->getPage(),
1941                                         'rc_user_text' => $current->getUserText(),
1942                                         "rc_timestamp > '{$s->rev_timestamp}'",
1943                                 ), $fname
1944                         );
1945                 }
1946
1947                 # Save it!
1948                 $target = Revision::newFromId( $s->rev_id );
1949                 $newcomment = wfMsg( 'revertpage', $target->getUserText(), $from );
1950
1951                 $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1952                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
1953                 $wgOut->addHTML( '<h2>' . htmlspecialchars( $newcomment ) . "</h2>\n<hr />\n" );
1954
1955                 $this->updateArticle( $target->getText(), $newcomment, 1, $this->mTitle->userIsWatching(), $bot );
1956                 Article::onArticleEdit( $this->mTitle );
1957
1958                 $dbw->commit();
1959                 $wgOut->returnToMain( false );
1960         }
1961
1962
1963         /**
1964          * Do standard deferred updates after page view
1965          * @private
1966          */
1967         function viewUpdates() {
1968                 global $wgDeferredUpdateList, $wgUseEnotif;
1969
1970                 if ( 0 != $this->getID() ) {
1971                         global $wgDisableCounters;
1972                         if( !$wgDisableCounters ) {
1973                                 Article::incViewCount( $this->getID() );
1974                                 $u = new SiteStatsUpdate( 1, 0, 0 );
1975                                 array_push( $wgDeferredUpdateList, $u );
1976                         }
1977                 }
1978
1979                 # Update newtalk status if user is reading their own
1980                 # talk page
1981
1982                 global $wgUser;
1983                 if ($this->mTitle->getNamespace() == NS_USER_TALK &&
1984                         $this->mTitle->getText() == $wgUser->getName())
1985                 {
1986                         if ( $wgUseEnotif ) {
1987                                 require_once( 'UserTalkUpdate.php' );
1988                                 $u = new UserTalkUpdate( 0, $this->mTitle->getNamespace(), $this->mTitle->getDBkey(), false, false, false );
1989                         } else {
1990                                 $wgUser->setNewtalk(0);
1991                                 $wgUser->saveNewtalk();
1992                         }
1993                 } elseif ( $wgUseEnotif ) {
1994                         $wgUser->clearNotification( $this->mTitle );
1995                 }
1996
1997         }
1998
1999         /**
2000          * Do standard deferred updates after page edit.
2001          * Every 1000th edit, prune the recent changes table.
2002          * @private
2003          * @param string $text
2004          */
2005         function editUpdates( $text, $summary, $minoredit, $timestamp_of_pagechange) {
2006                 global $wgDeferredUpdateList, $wgDBname, $wgMemc;
2007                 global $wgMessageCache, $wgUser, $wgUseEnotif;
2008
2009                 wfSeedRandom();
2010                 if ( 0 == mt_rand( 0, 999 ) ) {
2011                         # Periodically flush old entries from the recentchanges table.
2012                         global $wgRCMaxAge;
2013                         $dbw =& wfGetDB( DB_MASTER );
2014                         $cutoff = $dbw->timestamp( time() - $wgRCMaxAge );
2015                         $recentchanges = $dbw->tableName( 'recentchanges' );
2016                         $sql = "DELETE FROM $recentchanges WHERE rc_timestamp < '{$cutoff}'";
2017                         $dbw->query( $sql );
2018                 }
2019                 $id = $this->getID();
2020                 $title = $this->mTitle->getPrefixedDBkey();
2021                 $shortTitle = $this->mTitle->getDBkey();
2022
2023                 if ( 0 != $id ) {
2024                         $u = new LinksUpdate( $id, $title );
2025                         array_push( $wgDeferredUpdateList, $u );
2026                         $u = new SiteStatsUpdate( 0, 1, $this->mGoodAdjustment, $this->mTotalAdjustment );
2027                         array_push( $wgDeferredUpdateList, $u );
2028                         $u = new SearchUpdate( $id, $title, $text );
2029                         array_push( $wgDeferredUpdateList, $u );
2030
2031                         # If this is another user's talk page, update newtalk
2032
2033                         if ($this->mTitle->getNamespace() == NS_USER_TALK && $shortTitle != $wgUser->getName()) {
2034                                 if ( $wgUseEnotif ) {
2035                                         require_once( 'UserTalkUpdate.php' );
2036                                         $u = new UserTalkUpdate( 1, $this->mTitle->getNamespace(), $shortTitle, $summary,
2037                                           $minoredit, $timestamp_of_pagechange);
2038                                 } else {
2039                                         $other = User::newFromName( $shortTitle );
2040                                         if( is_null( $other ) && User::isIP( $shortTitle ) ) {
2041                                                 // An anonymous user
2042                                                 $other = new User();
2043                                                 $other->setName( $shortTitle );
2044                                         }
2045                                         if( $other ) {
2046                                                 $other->setNewtalk(1);
2047                                                 $other->saveNewtalk();
2048                                         }
2049                                 }
2050                         }
2051
2052                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
2053                                 $wgMessageCache->replace( $shortTitle, $text );
2054                         }
2055                 }
2056         }
2057
2058         /**
2059          * @todo document this function
2060          * @private
2061          * @param string $oldid         Revision ID of this article revision
2062          */
2063         function setOldSubtitle( $oldid=0 ) {
2064                 global $wgLang, $wgOut, $wgUser;
2065
2066                 $current = ( $oldid == $this->mLatest );
2067                 $td = $wgLang->timeanddate( $this->mTimestamp, true );
2068                 $sk = $wgUser->getSkin();
2069                 $lnk = $current
2070                         ? wfMsg( 'currentrevisionlink' )
2071                         : $lnk = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'currentrevisionlink' ) );
2072                 $prevlink = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'previousrevision' ), 'direction=prev&oldid='.$oldid );
2073                 $nextlink = $current
2074                         ? wfMsg( 'nextrevision' )
2075                         : $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'nextrevision' ), 'direction=next&oldid='.$oldid );
2076                 $r = wfMsg( 'revisionasofwithlink', $td, $lnk, $prevlink, $nextlink );
2077                 $wgOut->setSubtitle( $r );
2078         }
2079
2080         /**
2081          * This function is called right before saving the wikitext,
2082          * so we can do things like signatures and links-in-context.
2083          *
2084          * @param string $text
2085          */
2086         function preSaveTransform( $text ) {
2087                 global $wgParser, $wgUser;
2088                 return $wgParser->preSaveTransform( $text, $this->mTitle, $wgUser, ParserOptions::newFromUser( $wgUser ) );
2089         }
2090
2091         /* Caching functions */
2092
2093         /**
2094          * checkLastModified returns true if it has taken care of all
2095          * output to the client that is necessary for this request.
2096          * (that is, it has sent a cached version of the page)
2097          */
2098         function tryFileCache() {
2099                 static $called = false;
2100                 if( $called ) {
2101                         wfDebug( " tryFileCache() -- called twice!?\n" );
2102                         return;
2103                 }
2104                 $called = true;
2105                 if($this->isFileCacheable()) {
2106                         $touched = $this->mTouched;
2107                         $cache = new CacheManager( $this->mTitle );
2108                         if($cache->isFileCacheGood( $touched )) {
2109                                 global $wgOut;
2110                                 wfDebug( " tryFileCache() - about to load\n" );
2111                                 $cache->loadFromFileCache();
2112                                 return true;
2113                         } else {
2114                                 wfDebug( " tryFileCache() - starting buffer\n" );
2115                                 ob_start( array(&$cache, 'saveToFileCache' ) );
2116                         }
2117                 } else {
2118                         wfDebug( " tryFileCache() - not cacheable\n" );
2119                 }
2120         }
2121
2122         /**
2123          * Check if the page can be cached
2124          * @return bool
2125          */
2126         function isFileCacheable() {
2127                 global $wgUser, $wgUseFileCache, $wgShowIPinHeader, $wgRequest;
2128                 extract( $wgRequest->getValues( 'action', 'oldid', 'diff', 'redirect', 'printable' ) );
2129
2130                 return $wgUseFileCache
2131                         and (!$wgShowIPinHeader)
2132                         and ($this->getID() != 0)
2133                         and ($wgUser->isAnon())
2134                         and (!$wgUser->getNewtalk())
2135                         and ($this->mTitle->getNamespace() != NS_SPECIAL )
2136                         and (empty( $action ) || $action == 'view')
2137                         and (!isset($oldid))
2138                         and (!isset($diff))
2139                         and (!isset($redirect))
2140                         and (!isset($printable))
2141                         and (!$this->mRedirectedFrom);
2142         }
2143
2144         /**
2145          * Loads cur_touched and returns a value indicating if it should be used
2146          *
2147          */
2148         function checkTouched() {
2149                 $fname = 'Article::checkTouched';
2150                 if( !$this->mDataLoaded ) {
2151                         $dbr =& $this->getDB();
2152                         $data = $this->pageDataFromId( $dbr, $this->getId() );
2153                         if( $data ) {
2154                                 $this->loadPageData( $data );
2155                         }
2156                 }
2157                 return !$this->mIsRedirect;
2158         }
2159
2160         /**
2161          * Edit an article without doing all that other stuff
2162          * The article must already exist; link tables etc
2163          * are not updated, caches are not flushed.
2164          *
2165          * @param string $text text submitted
2166          * @param string $comment comment submitted
2167          * @param bool $minor whereas it's a minor modification
2168          */
2169         function quickEdit( $text, $comment = '', $minor = 0 ) {
2170                 $fname = 'Article::quickEdit';
2171                 wfProfileIn( $fname );
2172
2173                 $dbw =& wfGetDB( DB_MASTER );
2174                 $dbw->begin();
2175                 $revision = new Revision( array(
2176                         'page'       => $this->getId(),
2177                         'text'       => $text,
2178                         'comment'    => $comment,
2179                         'minor_edit' => $minor ? 1 : 0,
2180                         ) );
2181                 $revisionId = $revision->insertOn( $dbw );
2182                 $this->updateRevisionOn( $dbw, $revision );
2183                 $dbw->commit();
2184
2185                 wfProfileOut( $fname );
2186         }
2187
2188         /**
2189          * Used to increment the view counter
2190          *
2191          * @static
2192          * @param integer $id article id
2193          */
2194         function incViewCount( $id ) {
2195                 $id = intval( $id );
2196                 global $wgHitcounterUpdateFreq;
2197
2198                 $dbw =& wfGetDB( DB_MASTER );
2199                 $pageTable = $dbw->tableName( 'page' );
2200                 $hitcounterTable = $dbw->tableName( 'hitcounter' );
2201                 $acchitsTable = $dbw->tableName( 'acchits' );
2202
2203                 if( $wgHitcounterUpdateFreq <= 1 ){ //
2204                         $dbw->query( "UPDATE $pageTable SET page_counter = page_counter + 1 WHERE page_id = $id" );
2205                         return;
2206                 }
2207
2208                 # Not important enough to warrant an error page in case of failure
2209                 $oldignore = $dbw->ignoreErrors( true );
2210
2211                 $dbw->query( "INSERT INTO $hitcounterTable (hc_id) VALUES ({$id})" );
2212
2213                 $checkfreq = intval( $wgHitcounterUpdateFreq/25 + 1 );
2214                 if( (rand() % $checkfreq != 0) or ($dbw->lastErrno() != 0) ){
2215                         # Most of the time (or on SQL errors), skip row count check
2216                         $dbw->ignoreErrors( $oldignore );
2217                         return;
2218                 }
2219
2220                 $res = $dbw->query("SELECT COUNT(*) as n FROM $hitcounterTable");
2221                 $row = $dbw->fetchObject( $res );
2222                 $rown = intval( $row->n );
2223                 if( $rown >= $wgHitcounterUpdateFreq ){
2224                         wfProfileIn( 'Article::incViewCount-collect' );
2225                         $old_user_abort = ignore_user_abort( true );
2226
2227                         $dbw->query("LOCK TABLES $hitcounterTable WRITE");
2228                         $dbw->query("CREATE TEMPORARY TABLE $acchitsTable TYPE=HEAP ".
2229                                 "SELECT hc_id,COUNT(*) AS hc_n FROM $hitcounterTable ".
2230                                 'GROUP BY hc_id');
2231                         $dbw->query("DELETE FROM $hitcounterTable");
2232                         $dbw->query('UNLOCK TABLES');
2233                         $dbw->query("UPDATE $pageTable,$acchitsTable SET page_counter=page_counter + hc_n ".
2234                                 'WHERE page_id = hc_id');
2235                         $dbw->query("DROP TABLE $acchitsTable");
2236
2237                         ignore_user_abort( $old_user_abort );
2238                         wfProfileOut( 'Article::incViewCount-collect' );
2239                 }
2240                 $dbw->ignoreErrors( $oldignore );
2241         }
2242
2243         /**#@+
2244          * The onArticle*() functions are supposed to be a kind of hooks
2245          * which should be called whenever any of the specified actions
2246          * are done.
2247          *
2248          * This is a good place to put code to clear caches, for instance.
2249          *
2250          * This is called on page move and undelete, as well as edit
2251          * @static
2252          * @param $title_obj a title object
2253          */
2254
2255         function onArticleCreate($title_obj) {
2256                 global $wgUseSquid, $wgPostCommitUpdateList;
2257
2258                 $title_obj->touchLinks();
2259                 $titles = $title_obj->getLinksTo();
2260
2261                 # Purge squid
2262                 if ( $wgUseSquid ) {
2263                         $urls = $title_obj->getSquidURLs();
2264                         foreach ( $titles as $linkTitle ) {
2265                                 $urls[] = $linkTitle->getInternalURL();
2266                         }
2267                         $u = new SquidUpdate( $urls );
2268                         array_push( $wgPostCommitUpdateList, $u );
2269                 }
2270         }
2271
2272         function onArticleDelete($title_obj) {
2273                 $title_obj->touchLinks();
2274         }
2275
2276         function onArticleEdit($title_obj) {
2277                 // This would be an appropriate place to purge caches.
2278                 // Why's this not in here now?
2279         }
2280
2281         /**#@-*/
2282
2283         /**
2284          * Info about this page
2285          * Called for ?action=info when $wgAllowPageInfo is on.
2286          *
2287          * @access public
2288          */
2289         function info() {
2290                 global $wgLang, $wgOut, $wgAllowPageInfo;
2291                 $fname = 'Article::info';
2292
2293                 if ( !$wgAllowPageInfo ) {
2294                         $wgOut->errorpage( 'nosuchaction', 'nosuchactiontext' );
2295                         return;
2296                 }
2297
2298                 $page = $this->mTitle->getSubjectPage();
2299
2300                 $wgOut->setPagetitle( $page->getPrefixedText() );
2301                 $wgOut->setSubtitle( wfMsg( 'infosubtitle' ));
2302
2303                 # first, see if the page exists at all.
2304                 $exists = $page->getArticleId() != 0;
2305                 if( !$exists ) {
2306                         $wgOut->addHTML( wfMsg('noarticletext') );
2307                 } else {
2308                         $dbr =& $this->getDB( DB_SLAVE );
2309                         $wl_clause = array(
2310                                 'wl_title'     => $page->getDBkey(),
2311                                 'wl_namespace' => $page->getNamespace() );
2312                         $numwatchers = $dbr->selectField(
2313                                 'watchlist',
2314                                 'COUNT(*)',
2315                                 $wl_clause,
2316                                 $fname,
2317                                 $this->getSelectOptions() );
2318
2319                         $pageInfo = $this->pageCountInfo( $page );
2320                         $talkInfo = $this->pageCountInfo( $page->getTalkPage() );
2321
2322                         $wgOut->addHTML( "<ul><li>" . wfMsg("numwatchers", $wgLang->formatNum( $numwatchers ) ) . '</li>' );
2323                         $wgOut->addHTML( "<li>" . wfMsg('numedits', $wgLang->formatNum( $pageInfo['edits'] ) ) . '</li>');
2324                         if( $talkInfo ) {
2325                                 $wgOut->addHTML( '<li>' . wfMsg("numtalkedits", $wgLang->formatNum( $talkInfo['edits'] ) ) . '</li>');
2326                         }
2327                         $wgOut->addHTML( '<li>' . wfMsg("numauthors", $wgLang->formatNum( $pageInfo['authors'] ) ) . '</li>' );
2328                         if( $talkInfo ) {
2329                                 $wgOut->addHTML( '<li>' . wfMsg('numtalkauthors', $wgLang->formatNum( $talkInfo['authors'] ) ) . '</li>' );
2330                         }
2331                         $wgOut->addHTML( '</ul>' );
2332
2333                 }
2334         }
2335
2336         /**
2337          * Return the total number of edits and number of unique editors
2338          * on a given page. If page does not exist, returns false.
2339          *
2340          * @param Title $title
2341          * @return array
2342          * @access private
2343          */
2344         function pageCountInfo( $title ) {
2345                 $id = $title->getArticleId();
2346                 if( $id == 0 ) {
2347                         return false;
2348                 }
2349
2350                 $dbr =& $this->getDB( DB_SLAVE );
2351
2352                 $rev_clause = array( 'rev_page' => $id );
2353                 $fname = 'Article::pageCountInfo';
2354
2355                 $edits = $dbr->selectField(
2356                         'revision',
2357                         'COUNT(rev_page)',
2358                         $rev_clause,
2359                         $fname,
2360                         $this->getSelectOptions() );
2361
2362                 $authors = $dbr->selectField(
2363                         'revision',
2364                         'COUNT(DISTINCT rev_user_text)',
2365                         $rev_clause,
2366                         $fname,
2367                         $this->getSelectOptions() );
2368
2369                 return array( 'edits' => $edits, 'authors' => $authors );
2370         }
2371
2372         /**
2373          * Return a list of templates used by this article.
2374          * Uses the links table to find the templates
2375          *
2376          * @return array
2377          */
2378         function getUsedTemplates() {
2379                 $result = array();
2380                 $id = $this->mTitle->getArticleID();
2381
2382                 $db =& wfGetDB( DB_SLAVE );
2383                 $res = $db->select( array( 'pagelinks' ),
2384                         array( 'pl_title' ),
2385                         array(
2386                                 'pl_from' => $id,
2387                                 'pl_namespace' => NS_TEMPLATE ),
2388                         'Article:getUsedTemplates' );
2389                 if ( false !== $res ) {
2390                         if ( $db->numRows( $res ) ) {
2391                                 while ( $row = $db->fetchObject( $res ) ) {
2392                                         $result[] = $row->pl_title;
2393                                 }
2394                         }
2395                 }
2396                 $db->freeResult( $res );
2397                 return $result;
2398         }
2399
2400
2401 }
2402
2403
2404 ?>