includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 if ( !class_exists( 'UtfNormal' ) ) {
   9         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  10 }
  11
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 # Constants for pr_cascade bitfield
  22 define( 'CASCADE', 1 );
  23
  24 /**
  25  * Title class
  26  * - Represents a title, which may contain an interwiki designation or namespace
  27  * - Can fetch various kinds of data from the database, albeit inefficiently.
  28  *
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43         /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;                 # Text form (spaces not underscores) of the main part
  48         var $mUrlform;                  # URL-encoded form of the main part
  49         var $mDbkeyform;                # Main part with underscores
  50         var $mUserCaseDBKey;        # DB key with the initial letter in the case specified by the user
  51         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki;                # Interwiki prefix (or null string)
  53         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  54         var $mArticleID;                # Article ID, fetched from the link cache on demand
  55         var $mLatestID;                 # ID of most recent revision
  56         var $mRestrictions;             # Array of groups allowed to edit this article
  57         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  58         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  59         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  60         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  61         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  62         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  63         var $mDefaultNamespace;         # Namespace index when there is no namespace
  64                                         # Zero except in {{transclusion}} tags
  65         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  66         var $mLength;              # The page length, 0 for special pages
  67         var $mRedirect;            # Is the article at this title a redirect?
  68         /**#@-*/
  69
  70
  71         /**
  72          * Constructor
  73          * @private
  74          */
  75         /* private */ function __construct() {
  76                 $this->mInterwiki = $this->mUrlform =
  77                 $this->mTextform = $this->mDbkeyform = '';
  78                 $this->mArticleID = -1;
  79                 $this->mNamespace = NS_MAIN;
  80                 $this->mRestrictionsLoaded = false;
  81                 $this->mRestrictions = array();
  82                 # Dont change the following, NS_MAIN is hardcoded in several place
  83                 # See bug #696
  84                 $this->mDefaultNamespace = NS_MAIN;
  85                 $this->mWatched = NULL;
  86                 $this->mLatestID = false;
  87                 $this->mOldRestrictions = false;
  88                 $this->mLength = -1;
  89                 $this->mRedirect = NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from a prefixed DB key
  94          * @param string $key The database key, which has underscores
  95          *      instead of spaces, possibly including namespace and
  96          *      interwiki prefixes
  97          * @return Title the new object, or NULL on an error
  98          */
  99         public static function newFromDBkey( $key ) {
 100                 $t = new Title();
 101                 $t->mDbkeyform = $key;
 102                 if( $t->secureAndSplit() )
 103                         return $t;
 104                 else
 105                         return NULL;
 106         }
 107
 108         /**
 109          * Create a new Title from text, such as what one would
 110          * find in a link. Decodes any HTML entities in the text.
 111          *
 112          * @param string $text the link text; spaces, prefixes,
 113          *      and an initial ':' indicating the main namespace
 114          *      are accepted
 115          * @param int $defaultNamespace the namespace to use if
 116          *      none is specified by a prefix
 117          * @return Title the new object, or NULL on an error
 118          */
 119         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 120                 if( is_object( $text ) ) {
 121                         throw new MWException( 'Title::newFromText given an object' );
 122                 }
 123
 124                 /**
 125                  * Wiki pages often contain multiple links to the same page.
 126                  * Title normalization and parsing can become expensive on
 127                  * pages with many links, so we can save a little time by
 128                  * caching them.
 129                  *
 130                  * In theory these are value objects and won't get changed...
 131                  */
 132                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 133                         return Title::$titleCache[$text];
 134                 }
 135
 136                 /**
 137                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 138                  */
 139                 $filteredText = Sanitizer::decodeCharReferences( $text );
 140
 141                 $t = new Title();
 142                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 143                 $t->mDefaultNamespace = $defaultNamespace;
 144
 145                 static $cachedcount = 0 ;
 146                 if( $t->secureAndSplit() ) {
 147                         if( $defaultNamespace == NS_MAIN ) {
 148                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 149                                         # Avoid memory leaks on mass operations...
 150                                         Title::$titleCache = array();
 151                                         $cachedcount=0;
 152                                 }
 153                                 $cachedcount++;
 154                                 Title::$titleCache[$text] =& $t;
 155                         }
 156                         return $t;
 157                 } else {
 158                         $ret = NULL;
 159                         return $ret;
 160                 }
 161         }
 162
 163         /**
 164          * Create a new Title from URL-encoded text. Ensures that
 165          * the given title's length does not exceed the maximum.
 166          * @param string $url the title, as might be taken from a URL
 167          * @return Title the new object, or NULL on an error
 168          */
 169         public static function newFromURL( $url ) {
 170                 global $wgLegalTitleChars;
 171                 $t = new Title();
 172
 173                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 174                 # but some URLs used it as a space replacement and they still come
 175                 # from some external search tools.
 176                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 177                         $url = str_replace( '+', ' ', $url );
 178                 }
 179
 180                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 181                 if( $t->secureAndSplit() ) {
 182                         return $t;
 183                 } else {
 184                         return NULL;
 185                 }
 186         }
 187
 188         /**
 189          * Create a new Title from an article ID
 190          *
 191          * @todo This is inefficiently implemented, the page row is requested
 192          *       but not used for anything else
 193          *
 194          * @param int $id the page_id corresponding to the Title to create
 195          * @param int $flags, use FOR_UPDATE to use master
 196          * @return Title the new object, or NULL on an error
 197          */
 198         public static function newFromID( $id, $flags = 0 ) {
 199                 $fname = 'Title::newFromID';
 200                 $db = ($flags & FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 201                 $row = $db->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 202                         array( 'page_id' => $id ), $fname );
 203                 if ( $row !== false ) {
 204                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 205                 } else {
 206                         $title = NULL;
 207                 }
 208                 return $title;
 209         }
 210
 211         /**
 212          * Make an array of titles from an array of IDs
 213          */
 214         public static function newFromIDs( $ids ) {
 215                 if ( !count( $ids ) ) {
 216                         return array();
 217                 }
 218                 $dbr = wfGetDB( DB_SLAVE );
 219                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 220                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 221
 222                 $titles = array();
 223                 while ( $row = $dbr->fetchObject( $res ) ) {
 224                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 225                 }
 226                 return $titles;
 227         }
 228
 229         /**
 230          * Make a Title object from a DB row
 231          * @param Row $row (needs at least page_title,page_namespace)
 232          */
 233         public static function newFromRow( $row ) {
 234                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 235
 236                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 237                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 238                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 239                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 240
 241                 return $t;
 242         }
 243
 244         /**
 245          * Create a new Title from a namespace index and a DB key.
 246          * It's assumed that $ns and $title are *valid*, for instance when
 247          * they came directly from the database or a special page name.
 248          * For convenience, spaces are converted to underscores so that
 249          * eg user_text fields can be used directly.
 250          *
 251          * @param int $ns the namespace of the article
 252          * @param string $title the unprefixed database key form
 253          * @return Title the new object
 254          */
 255         public static function &makeTitle( $ns, $title ) {
 256                 $t = new Title();
 257                 $t->mInterwiki = '';
 258                 $t->mFragment = '';
 259                 $t->mNamespace = $ns = intval( $ns );
 260                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 261                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 262                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 263                 $t->mTextform = str_replace( '_', ' ', $title );
 264                 return $t;
 265         }
 266
 267         /**
 268          * Create a new Title from a namespace index and a DB key.
 269          * The parameters will be checked for validity, which is a bit slower
 270          * than makeTitle() but safer for user-provided data.
 271          *
 272          * @param int $ns the namespace of the article
 273          * @param string $title the database key form
 274          * @return Title the new object, or NULL on an error
 275          */
 276         public static function makeTitleSafe( $ns, $title ) {
 277                 $t = new Title();
 278                 $t->mDbkeyform = Title::makeName( $ns, $title );
 279                 if( $t->secureAndSplit() ) {
 280                         return $t;
 281                 } else {
 282                         return NULL;
 283                 }
 284         }
 285
 286         /**
 287          * Create a new Title for the Main Page
 288          * @return Title the new object
 289          */
 290         public static function newMainPage() {
 291                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 292                 // Don't give fatal errors if the message is broken
 293                 if ( !$title ) {
 294                         $title = Title::newFromText( 'Main Page' );
 295                 }
 296                 return $title;
 297         }
 298
 299         /**
 300          * Extract a redirect destination from a string and return the
 301          * Title, or null if the text doesn't contain a valid redirect
 302          *
 303          * @param string $text Text with possible redirect
 304          * @return Title
 305          */
 306         public static function newFromRedirect( $text ) {
 307                 $redir = MagicWord::get( 'redirect' );
 308                 if( $redir->matchStart( trim($text) ) ) {
 309                         // Extract the first link and see if it's usable
 310                         $m = array();
 311                         if( preg_match( '!\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 312                                 // Strip preceding colon used to "escape" categories, etc.
 313                                 // and URL-decode links
 314                                 if( strpos( $m[1], '%' ) !== false ) {
 315                                         // Match behavior of inline link parsing here;
 316                                         // don't interpret + as " " most of the time!
 317                                         // It might be safe to just use rawurldecode instead, though.
 318                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 319                                 }
 320                                 $title = Title::newFromText( $m[1] );
 321                                 // Redirects to Special:Userlogout are not permitted
 322                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 323                                         return $title;
 324                         }
 325                 }
 326                 return null;
 327         }
 328
 329 #----------------------------------------------------------------------------
 330 #       Static functions
 331 #----------------------------------------------------------------------------
 332
 333         /**
 334          * Get the prefixed DB key associated with an ID
 335          * @param int $id the page_id of the article
 336          * @return Title an object representing the article, or NULL
 337          *      if no such article was found
 338          * @static
 339          * @access public
 340          */
 341         function nameOf( $id ) {
 342                 $fname = 'Title::nameOf';
 343                 $dbr = wfGetDB( DB_SLAVE );
 344
 345                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 346                 if ( $s === false ) { return NULL; }
 347
 348                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 349                 return $n;
 350         }
 351
 352         /**
 353          * Get a regex character class describing the legal characters in a link
 354          * @return string the list of characters, not delimited
 355          */
 356         public static function legalChars() {
 357                 global $wgLegalTitleChars;
 358                 return $wgLegalTitleChars;
 359         }
 360
 361         /**
 362          * Get a string representation of a title suitable for
 363          * including in a search index
 364          *
 365          * @param int $ns a namespace index
 366          * @param string $title text-form main part
 367          * @return string a stripped-down title string ready for the
 368          *      search index
 369          */
 370         public static function indexTitle( $ns, $title ) {
 371                 global $wgContLang;
 372
 373                 $lc = SearchEngine::legalSearchChars() . '&#;';
 374                 $t = $wgContLang->stripForSearch( $title );
 375                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 376                 $t = $wgContLang->lc( $t );
 377
 378                 # Handle 's, s'
 379                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 380                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 381
 382                 $t = preg_replace( "/\\s+/", ' ', $t );
 383
 384                 if ( $ns == NS_IMAGE ) {
 385                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 386                 }
 387                 return trim( $t );
 388         }
 389
 390         /*
 391          * Make a prefixed DB key from a DB key and a namespace index
 392          * @param int $ns numerical representation of the namespace
 393          * @param string $title the DB key form the title
 394          * @return string the prefixed form of the title
 395          */
 396         public static function makeName( $ns, $title ) {
 397                 global $wgContLang;
 398
 399                 $n = $wgContLang->getNsText( $ns );
 400                 return $n == '' ? $title : "$n:$title";
 401         }
 402
 403         /**
 404          * Returns the URL associated with an interwiki prefix
 405          * @param string $key the interwiki prefix (e.g. "MeatBall")
 406          * @return the associated URL, containing "$1", which should be
 407          *      replaced by an article title
 408          * @static (arguably)
 409          */
 410         public function getInterwikiLink( $key )  {
 411                 global $wgMemc, $wgInterwikiExpiry;
 412                 global $wgInterwikiCache, $wgContLang;
 413                 $fname = 'Title::getInterwikiLink';
 414
 415                 $key = $wgContLang->lc( $key );
 416
 417                 $k = wfMemcKey( 'interwiki', $key );
 418                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 419                         return Title::$interwikiCache[$k]->iw_url;
 420                 }
 421
 422                 if ($wgInterwikiCache) {
 423                         return Title::getInterwikiCached( $key );
 424                 }
 425
 426                 $s = $wgMemc->get( $k );
 427                 # Ignore old keys with no iw_local
 428                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 429                         Title::$interwikiCache[$k] = $s;
 430                         return $s->iw_url;
 431                 }
 432
 433                 $dbr = wfGetDB( DB_SLAVE );
 434                 $res = $dbr->select( 'interwiki',
 435                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 436                         array( 'iw_prefix' => $key ), $fname );
 437                 if( !$res ) {
 438                         return '';
 439                 }
 440
 441                 $s = $dbr->fetchObject( $res );
 442                 if( !$s ) {
 443                         # Cache non-existence: create a blank object and save it to memcached
 444                         $s = (object)false;
 445                         $s->iw_url = '';
 446                         $s->iw_local = 0;
 447                         $s->iw_trans = 0;
 448                 }
 449                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 450                 Title::$interwikiCache[$k] = $s;
 451
 452                 return $s->iw_url;
 453         }
 454
 455         /**
 456          * Fetch interwiki prefix data from local cache in constant database
 457          *
 458          * More logic is explained in DefaultSettings
 459          *
 460          * @return string URL of interwiki site
 461          */
 462         public static function getInterwikiCached( $key ) {
 463                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 464                 static $db, $site;
 465
 466                 if (!$db)
 467                         $db=dba_open($wgInterwikiCache,'r','cdb');
 468                 /* Resolve site name */
 469                 if ($wgInterwikiScopes>=3 and !$site) {
 470                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 471                         if ($site=="")
 472                                 $site = $wgInterwikiFallbackSite;
 473                 }
 474                 $value = dba_fetch( wfMemcKey( $key ), $db);
 475                 if ($value=='' and $wgInterwikiScopes>=3) {
 476                         /* try site-level */
 477                         $value = dba_fetch("_{$site}:{$key}", $db);
 478                 }
 479                 if ($value=='' and $wgInterwikiScopes>=2) {
 480                         /* try globals */
 481                         $value = dba_fetch("__global:{$key}", $db);
 482                 }
 483                 if ($value=='undef')
 484                         $value='';
 485                 $s = (object)false;
 486                 $s->iw_url = '';
 487                 $s->iw_local = 0;
 488                 $s->iw_trans = 0;
 489                 if ($value!='') {
 490                         list($local,$url)=explode(' ',$value,2);
 491                         $s->iw_url=$url;
 492                         $s->iw_local=(int)$local;
 493                 }
 494                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 495                 return $s->iw_url;
 496         }
 497         /**
 498          * Determine whether the object refers to a page within
 499          * this project.
 500          *
 501          * @return bool TRUE if this is an in-project interwiki link
 502          *      or a wikilink, FALSE otherwise
 503          */
 504         public function isLocal() {
 505                 if ( $this->mInterwiki != '' ) {
 506                         # Make sure key is loaded into cache
 507                         $this->getInterwikiLink( $this->mInterwiki );
 508                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 509                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 510                 } else {
 511                         return true;
 512                 }
 513         }
 514
 515         /**
 516          * Determine whether the object refers to a page within
 517          * this project and is transcludable.
 518          *
 519          * @return bool TRUE if this is transcludable
 520          */
 521         public function isTrans() {
 522                 if ($this->mInterwiki == '')
 523                         return false;
 524                 # Make sure key is loaded into cache
 525                 $this->getInterwikiLink( $this->mInterwiki );
 526                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 527                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 528         }
 529
 530         /**
 531          * Escape a text fragment, say from a link, for a URL
 532          */
 533         static function escapeFragmentForURL( $fragment ) {
 534                 $fragment = str_replace( ' ', '_', $fragment );
 535                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 536                 $replaceArray = array(
 537                         '%3A' => ':',
 538                         '%' => '.'
 539                 );
 540                 return strtr( $fragment, $replaceArray );
 541         }
 542
 543 #----------------------------------------------------------------------------
 544 #       Other stuff
 545 #----------------------------------------------------------------------------
 546
 547         /** Simple accessors */
 548         /**
 549          * Get the text form (spaces not underscores) of the main part
 550          * @return string
 551          */
 552         public function getText() { return $this->mTextform; }
 553         /**
 554          * Get the URL-encoded form of the main part
 555          * @return string
 556          */
 557         public function getPartialURL() { return $this->mUrlform; }
 558         /**
 559          * Get the main part with underscores
 560          * @return string
 561          */
 562         public function getDBkey() { return $this->mDbkeyform; }
 563         /**
 564          * Get the namespace index, i.e. one of the NS_xxxx constants
 565          * @return int
 566          */
 567         public function getNamespace() { return $this->mNamespace; }
 568         /**
 569          * Get the namespace text
 570          * @return string
 571          */
 572         public function getNsText() {
 573                 global $wgContLang, $wgCanonicalNamespaceNames;
 574
 575                 if ( '' != $this->mInterwiki ) {
 576                         // This probably shouldn't even happen. ohh man, oh yuck.
 577                         // But for interwiki transclusion it sometimes does.
 578                         // Shit. Shit shit shit.
 579                         //
 580                         // Use the canonical namespaces if possible to try to
 581                         // resolve a foreign namespace.
 582                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 583                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 584                         }
 585                 }
 586                 return $wgContLang->getNsText( $this->mNamespace );
 587         }
 588         /**
 589          * Get the DB key with the initial letter case as specified by the user
 590          */
 591         function getUserCaseDBKey() {
 592                 return $this->mUserCaseDBKey;
 593         }
 594         /**
 595          * Get the namespace text of the subject (rather than talk) page
 596          * @return string
 597          */
 598         public function getSubjectNsText() {
 599                 global $wgContLang;
 600                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 601         }
 602
 603         /**
 604          * Get the namespace text of the talk page
 605          * @return string
 606          */
 607         public function getTalkNsText() {
 608                 global $wgContLang;
 609                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 610         }
 611
 612         /**
 613          * Could this title have a corresponding talk page?
 614          * @return bool
 615          */
 616         public function canTalk() {
 617                 return( MWNamespace::canTalk( $this->mNamespace ) );
 618         }
 619
 620         /**
 621          * Get the interwiki prefix (or null string)
 622          * @return string
 623          */
 624         public function getInterwiki() { return $this->mInterwiki; }
 625         /**
 626          * Get the Title fragment (i.e. the bit after the #) in text form
 627          * @return string
 628          */
 629         public function getFragment() { return $this->mFragment; }
 630         /**
 631          * Get the fragment in URL form, including the "#" character if there is one
 632          * @return string
 633          */
 634         public function getFragmentForURL() {
 635                 if ( $this->mFragment == '' ) {
 636                         return '';
 637                 } else {
 638                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 639                 }
 640         }
 641         /**
 642          * Get the default namespace index, for when there is no namespace
 643          * @return int
 644          */
 645         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 646
 647         /**
 648          * Get title for search index
 649          * @return string a stripped-down title string ready for the
 650          *      search index
 651          */
 652         public function getIndexTitle() {
 653                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 654         }
 655
 656         /**
 657          * Get the prefixed database key form
 658          * @return string the prefixed title, with underscores and
 659          *      any interwiki and namespace prefixes
 660          */
 661         public function getPrefixedDBkey() {
 662                 $s = $this->prefix( $this->mDbkeyform );
 663                 $s = str_replace( ' ', '_', $s );
 664                 return $s;
 665         }
 666
 667         /**
 668          * Get the prefixed title with spaces.
 669          * This is the form usually used for display
 670          * @return string the prefixed title, with spaces
 671          */
 672         public function getPrefixedText() {
 673                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 674                         $s = $this->prefix( $this->mTextform );
 675                         $s = str_replace( '_', ' ', $s );
 676                         $this->mPrefixedText = $s;
 677                 }
 678                 return $this->mPrefixedText;
 679         }
 680
 681         /**
 682          * Get the prefixed title with spaces, plus any fragment
 683          * (part beginning with '#')
 684          * @return string the prefixed title, with spaces and
 685          *      the fragment, including '#'
 686          */
 687         public function getFullText() {
 688                 $text = $this->getPrefixedText();
 689                 if( '' != $this->mFragment ) {
 690                         $text .= '#' . $this->mFragment;
 691                 }
 692                 return $text;
 693         }
 694
 695         /**
 696          * Get the base name, i.e. the leftmost parts before the /
 697          * @return string Base name
 698          */
 699         public function getBaseText() {
 700                 global $wgNamespacesWithSubpages;
 701                 if( !empty( $wgNamespacesWithSubpages[$this->mNamespace] ) ) {
 702                         $parts = explode( '/', $this->getText() );
 703                         # Don't discard the real title if there's no subpage involved
 704                         if( count( $parts ) > 1 )
 705                                 unset( $parts[ count( $parts ) - 1 ] );
 706                         return implode( '/', $parts );
 707                 } else {
 708                         return $this->getText();
 709                 }
 710         }
 711
 712         /**
 713          * Get the lowest-level subpage name, i.e. the rightmost part after /
 714          * @return string Subpage name
 715          */
 716         public function getSubpageText() {
 717                 global $wgNamespacesWithSubpages;
 718                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 719                         $parts = explode( '/', $this->mTextform );
 720                         return( $parts[ count( $parts ) - 1 ] );
 721                 } else {
 722                         return( $this->mTextform );
 723                 }
 724         }
 725
 726         /**
 727          * Get a URL-encoded form of the subpage text
 728          * @return string URL-encoded subpage name
 729          */
 730         public function getSubpageUrlForm() {
 731                 $text = $this->getSubpageText();
 732                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 733                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 734                 return( $text );
 735         }
 736
 737         /**
 738          * Get a URL-encoded title (not an actual URL) including interwiki
 739          * @return string the URL-encoded form
 740          */
 741         public function getPrefixedURL() {
 742                 $s = $this->prefix( $this->mDbkeyform );
 743                 $s = str_replace( ' ', '_', $s );
 744
 745                 $s = wfUrlencode ( $s ) ;
 746
 747                 # Cleaning up URL to make it look nice -- is this safe?
 748                 $s = str_replace( '%28', '(', $s );
 749                 $s = str_replace( '%29', ')', $s );
 750
 751                 return $s;
 752         }
 753
 754         /**
 755          * Get a real URL referring to this title, with interwiki link and
 756          * fragment
 757          *
 758          * @param string $query an optional query string, not used
 759          *      for interwiki links
 760          * @param string $variant language variant of url (for sr, zh..)
 761          * @return string the URL
 762          */
 763         public function getFullURL( $query = '', $variant = false ) {
 764                 global $wgContLang, $wgServer, $wgRequest;
 765
 766                 if ( '' == $this->mInterwiki ) {
 767                         $url = $this->getLocalUrl( $query, $variant );
 768
 769                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 770                         // Correct fix would be to move the prepending elsewhere.
 771                         if ($wgRequest->getVal('action') != 'render') {
 772                                 $url = $wgServer . $url;
 773                         }
 774                 } else {
 775                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 776
 777                         $namespace = wfUrlencode( $this->getNsText() );
 778                         if ( '' != $namespace ) {
 779                                 # Can this actually happen? Interwikis shouldn't be parsed.
 780                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 781                                 $namespace .= ':';
 782                         }
 783                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 784                         $url = wfAppendQuery( $url, $query );
 785                 }
 786
 787                 # Finally, add the fragment.
 788                 $url .= $this->getFragmentForURL();
 789
 790                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 791                 return $url;
 792         }
 793
 794         /**
 795          * Get a URL with no fragment or server name.  If this page is generated
 796          * with action=render, $wgServer is prepended.
 797          * @param string $query an optional query string; if not specified,
 798          *      $wgArticlePath will be used.
 799          * @param string $variant language variant of url (for sr, zh..)
 800          * @return string the URL
 801          */
 802         public function getLocalURL( $query = '', $variant = false ) {
 803                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 804                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 805
 806                 // internal links should point to same variant as current page (only anonymous users)
 807                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 808                         $pref = $wgContLang->getPreferredVariant(false);
 809                         if($pref != $wgContLang->getCode())
 810                                 $variant = $pref;
 811                 }
 812
 813                 if ( $this->isExternal() ) {
 814                         $url = $this->getFullURL();
 815                         if ( $query ) {
 816                                 // This is currently only used for edit section links in the
 817                                 // context of interwiki transclusion. In theory we should
 818                                 // append the query to the end of any existing query string,
 819                                 // but interwiki transclusion is already broken in that case.
 820                                 $url .= "?$query";
 821                         }
 822                 } else {
 823                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 824                         if ( $query == '' ) {
 825                                 if( $variant != false && $wgContLang->hasVariants() ) {
 826                                         if( $wgVariantArticlePath == false ) {
 827                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 828                                         } else {
 829                                                 $variantArticlePath = $wgVariantArticlePath;
 830                                         }
 831                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 832                                         $url = str_replace( '$1', $dbkey, $url  );
 833                                 } else {
 834                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 835                                 }
 836                         } else {
 837                                 global $wgActionPaths;
 838                                 $url = false;
 839                                 $matches = array();
 840                                 if( !empty( $wgActionPaths ) &&
 841                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 842                                 {
 843                                         $action = urldecode( $matches[2] );
 844                                         if( isset( $wgActionPaths[$action] ) ) {
 845                                                 $query = $matches[1];
 846                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 847                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 848                                                 if( $query != '' ) $url .= '?' . $query;
 849                                         }
 850                                 }
 851                                 if ( $url === false ) {
 852                                         if ( $query == '-' ) {
 853                                                 $query = '';
 854                                         }
 855                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 856                                 }
 857                         }
 858
 859                         // FIXME: this causes breakage in various places when we
 860                         // actually expected a local URL and end up with dupe prefixes.
 861                         if ($wgRequest->getVal('action') == 'render') {
 862                                 $url = $wgServer . $url;
 863                         }
 864                 }
 865                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 866                 return $url;
 867         }
 868
 869         /**
 870          * Get an HTML-escaped version of the URL form, suitable for
 871          * using in a link, without a server name or fragment
 872          * @param string $query an optional query string
 873          * @return string the URL
 874          */
 875         public function escapeLocalURL( $query = '' ) {
 876                 return htmlspecialchars( $this->getLocalURL( $query ) );
 877         }
 878
 879         /**
 880          * Get an HTML-escaped version of the URL form, suitable for
 881          * using in a link, including the server name and fragment
 882          *
 883          * @return string the URL
 884          * @param string $query an optional query string
 885          */
 886         public function escapeFullURL( $query = '' ) {
 887                 return htmlspecialchars( $this->getFullURL( $query ) );
 888         }
 889
 890         /**
 891          * Get the URL form for an internal link.
 892          * - Used in various Squid-related code, in case we have a different
 893          * internal hostname for the server from the exposed one.
 894          *
 895          * @param string $query an optional query string
 896          * @param string $variant language variant of url (for sr, zh..)
 897          * @return string the URL
 898          */
 899         public function getInternalURL( $query = '', $variant = false ) {
 900                 global $wgInternalServer;
 901                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 902                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 903                 return $url;
 904         }
 905
 906         /**
 907          * Get the edit URL for this Title
 908          * @return string the URL, or a null string if this is an
 909          *      interwiki link
 910          */
 911         public function getEditURL() {
 912                 if ( '' != $this->mInterwiki ) { return ''; }
 913                 $s = $this->getLocalURL( 'action=edit' );
 914
 915                 return $s;
 916         }
 917
 918         /**
 919          * Get the HTML-escaped displayable text form.
 920          * Used for the title field in <a> tags.
 921          * @return string the text, including any prefixes
 922          */
 923         public function getEscapedText() {
 924                 return htmlspecialchars( $this->getPrefixedText() );
 925         }
 926
 927         /**
 928          * Is this Title interwiki?
 929          * @return boolean
 930          */
 931         public function isExternal() { return ( '' != $this->mInterwiki ); }
 932
 933         /**
 934          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 935          *
 936          * @param string Action to check (default: edit)
 937          * @return bool
 938          */
 939         public function isSemiProtected( $action = 'edit' ) {
 940                 if( $this->exists() ) {
 941                         $restrictions = $this->getRestrictions( $action );
 942                         if( count( $restrictions ) > 0 ) {
 943                                 foreach( $restrictions as $restriction ) {
 944                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 945                                                 return false;
 946                                 }
 947                         } else {
 948                                 # Not protected
 949                                 return false;
 950                         }
 951                         return true;
 952                 } else {
 953                         # If it doesn't exist, it can't be protected
 954                         return false;
 955                 }
 956         }
 957
 958         /**
 959          * Does the title correspond to a protected article?
 960          * @param string $what the action the page is protected from,
 961          * by default checks move and edit
 962          * @return boolean
 963          */
 964         public function isProtected( $action = '' ) {
 965                 global $wgRestrictionLevels, $wgRestrictionTypes;
 966
 967                 # Special pages have inherent protection
 968                 if( $this->getNamespace() == NS_SPECIAL )
 969                         return true;
 970
 971                 # Check regular protection levels
 972                 foreach( $wgRestrictionTypes as $type ){
 973                         if( $action == $type || $action == '' ) {
 974                                 $r = $this->getRestrictions( $type );
 975                                 foreach( $wgRestrictionLevels as $level ) {
 976                                         if( in_array( $level, $r ) && $level != '' ) {
 977                                                 return true;
 978                                         }
 979                                 }
 980                         }
 981                 }
 982
 983                 return false;
 984         }
 985
 986         /**
 987          * Is $wgUser watching this page?
 988          * @return boolean
 989          */
 990         public function userIsWatching() {
 991                 global $wgUser;
 992
 993                 if ( is_null( $this->mWatched ) ) {
 994                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 995                                 $this->mWatched = false;
 996                         } else {
 997                                 $this->mWatched = $wgUser->isWatched( $this );
 998                         }
 999                 }
1000                 return $this->mWatched;
1001         }
1002
1003         /**
1004          * Can $wgUser perform $action on this page?
1005          * This skips potentially expensive cascading permission checks.
1006          *
1007          * Suitable for use for nonessential UI controls in common cases, but
1008          * _not_ for functional access control.
1009          *
1010          * May provide false positives, but should never provide a false negative.
1011          *
1012          * @param string $action action that permission needs to be checked for
1013          * @return boolean
1014          */
1015         public function quickUserCan( $action ) {
1016                 return $this->userCan( $action, false );
1017         }
1018
1019         /**
1020          * Determines if $wgUser is unable to edit this page because it has been protected
1021          * by $wgNamespaceProtection.
1022          *
1023          * @return boolean
1024          */
1025         public function isNamespaceProtected() {
1026                 global $wgNamespaceProtection, $wgUser;
1027                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1028                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1029                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1030                                         return true;
1031                         }
1032                 }
1033                 return false;
1034         }
1035
1036         /**
1037          * Can $wgUser perform $action on this page?
1038          * @param string $action action that permission needs to be checked for
1039          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1040          * @return boolean
1041          */
1042         public function userCan( $action, $doExpensiveQueries = true ) {
1043                 global $wgUser;
1044                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1045         }
1046
1047         /**
1048          * Can $user perform $action on this page?
1049          *
1050          * FIXME: This *does not* check throttles (User::pingLimiter()).
1051          *
1052          * @param string $action action that permission needs to be checked for
1053          * @param User $user user to check
1054          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1055          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1056          */
1057         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1058                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1059
1060                 global $wgContLang;
1061                 global $wgLang;
1062                 global $wgEmailConfirmToEdit;
1063
1064                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1065                         $errors[] = array( 'confirmedittext' );
1066                 }
1067
1068                 if ( $user->isBlockedFrom( $this ) ) {
1069                         $block = $user->mBlock;
1070
1071                         // This is from OutputPage::blockedPage
1072                         // Copied at r23888 by werdna
1073
1074                         $id = $user->blockedBy();
1075                         $reason = $user->blockedFor();
1076                         if( $reason == '' ) {
1077                                 $reason = wfMsg( 'blockednoreason' );
1078                         }
1079                         $ip = wfGetIP();
1080
1081                         if ( is_numeric( $id ) ) {
1082                                 $name = User::whoIs( $id );
1083                         } else {
1084                                 $name = $id;
1085                         }
1086
1087                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1088                         $blockid = $block->mId;
1089                         $blockExpiry = $user->mBlock->mExpiry;
1090                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1091
1092                         if ( $blockExpiry == 'infinity' ) {
1093                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1094                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1095
1096                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1097                                         if ( strpos( $option, ':' ) == false )
1098                                                 continue;
1099
1100                                         list ($show, $value) = explode( ":", $option );
1101
1102                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1103                                                 $blockExpiry = $show;
1104                                                 break;
1105                                         }
1106                                 }
1107                         } else {
1108                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1109                         }
1110
1111                         $intended = $user->mBlock->mAddress;
1112
1113                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1114                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1115                 }
1116
1117                 return $errors;
1118         }
1119
1120         /**
1121          * Can $user perform $action on this page? This is an internal function,
1122          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1123          * checks on wfReadOnly() and blocks)
1124          *
1125          * @param string $action action that permission needs to be checked for
1126          * @param User $user user to check
1127          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1128          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1129          */
1130         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1131                 wfProfileIn( __METHOD__ );
1132
1133                 $errors = array();
1134
1135                 // Use getUserPermissionsErrors instead
1136                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1137                         wfProfileOut( __METHOD__ );
1138                         return $result ? array() : array( array( 'badaccess-group0' ) );
1139                 }
1140
1141                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1142                         if ($result != array() && is_array($result) && !is_array($result[0]))
1143                                 $errors[] = $result; # A single array representing an error
1144                         else if (is_array($result) && is_array($result[0]))
1145                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1146                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1147                                 $errors[] = array($result); # A string representing a message-id
1148                         else if ($result === false )
1149                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1150                 }
1151                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1152                         if ($result != array() && is_array($result) && !is_array($result[0]))
1153                                 $errors[] = $result; # A single array representing an error
1154                         else if (is_array($result) && is_array($result[0]))
1155                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1156                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1157                                 $errors[] = array($result); # A string representing a message-id
1158                         else if ($result === false )
1159                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1160                 }
1161
1162                 if( NS_SPECIAL == $this->mNamespace ) {
1163                         $errors[] = array('ns-specialprotected');
1164                 }
1165
1166                 if ( $this->isNamespaceProtected() ) {
1167                         $ns = $this->getNamespace() == NS_MAIN
1168                                 ? wfMsg( 'nstab-main' )
1169                                 : $this->getNsText();
1170                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1171                                 ? array('protectedinterface')
1172                                 : array( 'namespaceprotected',  $ns ) );
1173                 }
1174
1175                 if( $this->mDbkeyform == '_' ) {
1176                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1177                         $errors[] = array('badaccess-group0');
1178                 }
1179
1180                 # protect css/js subpages of user pages
1181                 # XXX: this might be better using restrictions
1182                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1183                 if( $this->isCssJsSubpage()
1184                         && !$user->isAllowed('editusercssjs')
1185                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1186                         $errors[] = array('customcssjsprotected');
1187                 }
1188
1189                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1190                         # We /could/ use the protection level on the source page, but it's fairly ugly
1191                         #  as we have to establish a precedence hierarchy for pages included by multiple
1192                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1193                         #  as they could remove the protection anyway.
1194                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1195                         # Cascading protection depends on more than this page...
1196                         # Several cascading protected pages may include this page...
1197                         # Check each cascading level
1198                         # This is only for protection restrictions, not for all actions
1199                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1200                                 foreach( $restrictions[$action] as $right ) {
1201                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1202                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1203                                                 $pages = '';
1204                                                 foreach( $cascadingSources as $page )
1205                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1206                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1207                                         }
1208                                 }
1209                         }
1210                 }
1211
1212                 foreach( $this->getRestrictions($action) as $right ) {
1213                         // Backwards compatibility, rewrite sysop -> protect
1214                         if ( $right == 'sysop' ) {
1215                                 $right = 'protect';
1216                         }
1217                         if( '' != $right && !$user->isAllowed( $right ) ) {
1218                                 //Users with 'editprotected' permission can edit protected pages
1219                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1220                                         //Users with 'editprotected' permission cannot edit protected pages
1221                                         //with cascading option turned on.
1222                                         if($this->mCascadeRestriction) {
1223                                                 $errors[] = array( 'protectedpagetext', $right );
1224                                         } else {
1225                                                 //Nothing, user can edit!
1226                                         }
1227                                 } else {
1228                                         $errors[] = array( 'protectedpagetext', $right );
1229                                 }
1230                         }
1231                 }
1232
1233                 if ($action == 'protect') {
1234                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1235                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1236                         }
1237                 }
1238
1239                 if ($action == 'create') {
1240                         $title_protection = $this->getTitleProtection();
1241
1242                         if (is_array($title_protection)) {
1243                                 extract($title_protection);
1244
1245                                 if ($pt_create_perm == 'sysop')
1246                                         $pt_create_perm = 'protect';
1247
1248                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1249                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1250                                 }
1251                         }
1252
1253                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1254                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1255                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1256                         }
1257                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1258                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1259                 } elseif ( !$user->isAllowed( $action ) ) {
1260                         $return = null;
1261                         $groups = array();
1262                         global $wgGroupPermissions;
1263                         foreach( $wgGroupPermissions as $key => $value ) {
1264                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1265                                         $groupName = User::getGroupName( $key );
1266                                         $groupPage = User::getGroupPage( $key );
1267                                         if( $groupPage ) {
1268                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1269                                         } else {
1270                                                 $groups[] = $groupName;
1271                                         }
1272                                 }
1273                         }
1274                         $n = count( $groups );
1275                         $groups = implode( ', ', $groups );
1276                         switch( $n ) {
1277                                 case 0:
1278                                 case 1:
1279                                 case 2:
1280                                         $return = array( "badaccess-group$n", $groups );
1281                                         break;
1282                                 default:
1283                                         $return = array( 'badaccess-groups', $groups );
1284                         }
1285                         $errors[] = $return;
1286                 }
1287
1288                 wfProfileOut( __METHOD__ );
1289                 return $errors;
1290         }
1291
1292         /**
1293          * Is this title subject to title protection?
1294          * @return mixed An associative array representing any existent title
1295          *   protection, or false if there's none.
1296          */
1297         private function getTitleProtection() {
1298                 // Can't protect pages in special namespaces
1299                 if ( $this->getNamespace() < 0 ) {
1300                         return false;
1301                 }
1302
1303                 $dbr = wfGetDB( DB_SLAVE );
1304                 $res = $dbr->select( 'protected_titles', '*',
1305                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1306
1307                 if ($row = $dbr->fetchRow( $res )) {
1308                         return $row;
1309                 } else {
1310                         return false;
1311                 }
1312         }
1313
1314         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1315                 global $wgGroupPermissions,$wgUser,$wgContLang;
1316
1317                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1318                         && $expiry == $this->mRestrictionsExpiry) {
1319                         // No change
1320                         return true;
1321                 }
1322
1323                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1324
1325                 $dbw = wfGetDB( DB_MASTER );
1326
1327                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1328
1329                 $expiry_description = '';
1330                 if ( $encodedExpiry != 'infinity' ) {
1331                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1332                 }
1333
1334                 # Update protection table
1335                 if ($create_perm != '' ) {
1336                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1337                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1338                                         , 'pt_create_perm' => $create_perm
1339                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1340                                         , 'pt_expiry' => $encodedExpiry
1341                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1342                 } else {
1343                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1344                                 'pt_title' => $title ), __METHOD__ );
1345                 }
1346                 # Update the protection log
1347                 $log = new LogPage( 'protect' );
1348
1349                 if( $create_perm ) {
1350                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1351                 } else {
1352                         $log->addEntry( 'unprotect', $this, $reason );
1353                 }
1354
1355                 return true;
1356         }
1357
1358         /**
1359          * Remove any title protection (due to page existing
1360          */
1361         public function deleteTitleProtection() {
1362                 $dbw = wfGetDB( DB_MASTER );
1363
1364                 $dbw->delete( 'protected_titles',
1365                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1366         }
1367
1368         /**
1369          * Can $wgUser edit this page?
1370          * @return boolean
1371          * @deprecated use userCan('edit')
1372          */
1373         public function userCanEdit( $doExpensiveQueries = true ) {
1374                 return $this->userCan( 'edit', $doExpensiveQueries );
1375         }
1376
1377         /**
1378          * Can $wgUser create this page?
1379          * @return boolean
1380          * @deprecated use userCan('create')
1381          */
1382         public function userCanCreate( $doExpensiveQueries = true ) {
1383                 return $this->userCan( 'create', $doExpensiveQueries );
1384         }
1385
1386         /**
1387          * Can $wgUser move this page?
1388          * @return boolean
1389          * @deprecated use userCan('move')
1390          */
1391         public function userCanMove( $doExpensiveQueries = true ) {
1392                 return $this->userCan( 'move', $doExpensiveQueries );
1393         }
1394
1395         /**
1396          * Would anybody with sufficient privileges be able to move this page?
1397          * Some pages just aren't movable.
1398          *
1399          * @return boolean
1400          */
1401         public function isMovable() {
1402                 return MWNamespace::isMovable( $this->getNamespace() )
1403                         && $this->getInterwiki() == '';
1404         }
1405
1406         /**
1407          * Can $wgUser read this page?
1408          * @return boolean
1409          * @todo fold these checks into userCan()
1410          */
1411         public function userCanRead() {
1412                 global $wgUser, $wgGroupPermissions;
1413
1414                 $result = null;
1415                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1416                 if ( $result !== null ) {
1417                         return $result;
1418                 }
1419
1420                 # Shortcut for public wikis, allows skipping quite a bit of code
1421                 if ($wgGroupPermissions['*']['read'])
1422                         return true;
1423
1424                 if( $wgUser->isAllowed( 'read' ) ) {
1425                         return true;
1426                 } else {
1427                         global $wgWhitelistRead;
1428
1429                         /**
1430                          * Always grant access to the login page.
1431                          * Even anons need to be able to log in.
1432                         */
1433                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1434                                 return true;
1435                         }
1436
1437                         /**
1438                          * Bail out if there isn't whitelist
1439                          */
1440                         if( !is_array($wgWhitelistRead) ) {
1441                                 return false;
1442                         }
1443
1444                         /**
1445                          * Check for explicit whitelisting
1446                          */
1447                         $name = $this->getPrefixedText();
1448                         if( in_array( $name, $wgWhitelistRead, true ) )
1449                                 return true;
1450
1451                         /**
1452                          * Old settings might have the title prefixed with
1453                          * a colon for main-namespace pages
1454                          */
1455                         if( $this->getNamespace() == NS_MAIN ) {
1456                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1457                                         return true;
1458                         }
1459
1460                         /**
1461                          * If it's a special page, ditch the subpage bit
1462                          * and check again
1463                          */
1464                         if( $this->getNamespace() == NS_SPECIAL ) {
1465                                 $name = $this->getDBkey();
1466                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1467                                 if ( $name === false ) {
1468                                         # Invalid special page, but we show standard login required message
1469                                         return false;
1470                                 }
1471
1472                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1473                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1474                                         return true;
1475                         }
1476
1477                 }
1478                 return false;
1479         }
1480
1481         /**
1482          * Is this a talk page of some sort?
1483          * @return bool
1484          */
1485         public function isTalkPage() {
1486                 return MWNamespace::isTalk( $this->getNamespace() );
1487         }
1488
1489         /**
1490          * Is this a subpage?
1491          * @return bool
1492          */
1493         public function isSubpage() {
1494                 global $wgNamespacesWithSubpages;
1495
1496                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1497                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1498                 } else {
1499                         return false;
1500                 }
1501         }
1502
1503         /**
1504          * Could this page contain custom CSS or JavaScript, based
1505          * on the title?
1506          *
1507          * @return bool
1508          */
1509         public function isCssOrJsPage() {
1510                 return $this->mNamespace == NS_MEDIAWIKI
1511                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1512         }
1513
1514         /**
1515          * Is this a .css or .js subpage of a user page?
1516          * @return bool
1517          */
1518         public function isCssJsSubpage() {
1519                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1520         }
1521         /**
1522          * Is this a *valid* .css or .js subpage of a user page?
1523          * Check that the corresponding skin exists
1524          */
1525         public function isValidCssJsSubpage() {
1526                 if ( $this->isCssJsSubpage() ) {
1527                         $skinNames = Skin::getSkinNames();
1528                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1529                 } else {
1530                         return false;
1531                 }
1532         }
1533         /**
1534          * Trim down a .css or .js subpage title to get the corresponding skin name
1535          */
1536         public function getSkinFromCssJsSubpage() {
1537                 $subpage = explode( '/', $this->mTextform );
1538                 $subpage = $subpage[ count( $subpage ) - 1 ];
1539                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1540         }
1541         /**
1542          * Is this a .css subpage of a user page?
1543          * @return bool
1544          */
1545         public function isCssSubpage() {
1546                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1547         }
1548         /**
1549          * Is this a .js subpage of a user page?
1550          * @return bool
1551          */
1552         public function isJsSubpage() {
1553                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1554         }
1555         /**
1556          * Protect css/js subpages of user pages: can $wgUser edit
1557          * this page?
1558          *
1559          * @return boolean
1560          * @todo XXX: this might be better using restrictions
1561          */
1562         public function userCanEditCssJsSubpage() {
1563                 global $wgUser;
1564                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1565         }
1566
1567         /**
1568          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1569          *
1570          * @return bool If the page is subject to cascading restrictions.
1571          */
1572         public function isCascadeProtected() {
1573                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1574                 return ( $sources > 0 );
1575         }
1576
1577         /**
1578          * Cascading protection: Get the source of any cascading restrictions on this page.
1579          *
1580          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1581          * @return array( mixed title array, restriction array)
1582          * Array of the Title objects of the pages from which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1583          * The restriction array is an array of each type, each of which contains an array of unique groups
1584          */
1585         public function getCascadeProtectionSources( $get_pages = true ) {
1586                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1587
1588                 # Define our dimension of restrictions types
1589                 $pagerestrictions = array();
1590                 foreach( $wgRestrictionTypes as $action )
1591                         $pagerestrictions[$action] = array();
1592
1593                 if (!$wgEnableCascadingProtection)
1594                         return array( false, $pagerestrictions );
1595
1596                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1597                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1598                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1599                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1600                 }
1601
1602                 wfProfileIn( __METHOD__ );
1603
1604                 $dbr = wfGetDb( DB_SLAVE );
1605
1606                 if ( $this->getNamespace() == NS_IMAGE ) {
1607                         $tables = array ('imagelinks', 'page_restrictions');
1608                         $where_clauses = array(
1609                                 'il_to' => $this->getDBkey(),
1610                                 'il_from=pr_page',
1611                                 'pr_cascade' => 1 );
1612                 } else {
1613                         $tables = array ('templatelinks', 'page_restrictions');
1614                         $where_clauses = array(
1615                                 'tl_namespace' => $this->getNamespace(),
1616                                 'tl_title' => $this->getDBkey(),
1617                                 'tl_from=pr_page',
1618                                 'pr_cascade' => 1 );
1619                 }
1620
1621                 if ( $get_pages ) {
1622                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1623                         $where_clauses[] = 'page_id=pr_page';
1624                         $tables[] = 'page';
1625                 } else {
1626                         $cols = array( 'pr_expiry' );
1627                 }
1628
1629                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1630
1631                 $sources = $get_pages ? array() : false;
1632                 $now = wfTimestampNow();
1633                 $purgeExpired = false;
1634
1635                 while( $row = $dbr->fetchObject( $res ) ) {
1636                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1637                         if( $expiry > $now ) {
1638                                 if ($get_pages) {
1639                                         $page_id = $row->pr_page;
1640                                         $page_ns = $row->page_namespace;
1641                                         $page_title = $row->page_title;
1642                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1643                                         # Add groups needed for each restriction type if its not already there
1644                                         # Make sure this restriction type still exists
1645                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1646                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1647                                         }
1648                                 } else {
1649                                         $sources = true;
1650                                 }
1651                         } else {
1652                                 // Trigger lazy purge of expired restrictions from the db
1653                                 $purgeExpired = true;
1654                         }
1655                 }
1656                 if( $purgeExpired ) {
1657                         Title::purgeExpiredRestrictions();
1658                 }
1659
1660                 wfProfileOut( __METHOD__ );
1661
1662                 if ( $get_pages ) {
1663                         $this->mCascadeSources = $sources;
1664                         $this->mCascadingRestrictions = $pagerestrictions;
1665                 } else {
1666                         $this->mHasCascadingRestrictions = $sources;
1667                 }
1668
1669                 return array( $sources, $pagerestrictions );
1670         }
1671
1672         function areRestrictionsCascading() {
1673                 if (!$this->mRestrictionsLoaded) {
1674                         $this->loadRestrictions();
1675                 }
1676
1677                 return $this->mCascadeRestriction;
1678         }
1679
1680         /**
1681          * Loads a string into mRestrictions array
1682          * @param resource $res restrictions as an SQL result.
1683          */
1684         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1685                 global $wgRestrictionTypes;
1686                 $dbr = wfGetDB( DB_SLAVE );
1687
1688                 foreach( $wgRestrictionTypes as $type ){
1689                         $this->mRestrictions[$type] = array();
1690                 }
1691
1692                 $this->mCascadeRestriction = false;
1693                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1694
1695                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1696
1697                 if ( $oldFashionedRestrictions === NULL ) {
1698                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1699                 }
1700
1701                 if ($oldFashionedRestrictions != '') {
1702
1703                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1704                                 $temp = explode( '=', trim( $restrict ) );
1705                                 if(count($temp) == 1) {
1706                                         // old old format should be treated as edit/move restriction
1707                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1708                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1709                                 } else {
1710                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1711                                 }
1712                         }
1713
1714                         $this->mOldRestrictions = true;
1715
1716                 }
1717
1718                 if( $dbr->numRows( $res ) ) {
1719                         # Current system - load second to make them override.
1720                         $now = wfTimestampNow();
1721                         $purgeExpired = false;
1722
1723                         while ($row = $dbr->fetchObject( $res ) ) {
1724                                 # Cycle through all the restrictions.
1725
1726                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1727                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1728                                         continue;
1729
1730                                 // This code should be refactored, now that it's being used more generally,
1731                                 // But I don't really see any harm in leaving it in Block for now -werdna
1732                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1733
1734                                 // Only apply the restrictions if they haven't expired!
1735                                 if ( !$expiry || $expiry > $now ) {
1736                                         $this->mRestrictionsExpiry = $expiry;
1737                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1738
1739                                         $this->mCascadeRestriction |= $row->pr_cascade;
1740                                 } else {
1741                                         // Trigger a lazy purge of expired restrictions
1742                                         $purgeExpired = true;
1743                                 }
1744                         }
1745
1746                         if( $purgeExpired ) {
1747                                 Title::purgeExpiredRestrictions();
1748                         }
1749                 }
1750
1751                 $this->mRestrictionsLoaded = true;
1752         }
1753
1754         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1755                 if( !$this->mRestrictionsLoaded ) {
1756                         if ($this->exists()) {
1757                                 $dbr = wfGetDB( DB_SLAVE );
1758
1759                                 $res = $dbr->select( 'page_restrictions', '*',
1760                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1761
1762                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1763                         } else {
1764                                 $title_protection = $this->getTitleProtection();
1765
1766                                 if (is_array($title_protection)) {
1767                                         extract($title_protection);
1768
1769                                         $now = wfTimestampNow();
1770                                         $expiry = Block::decodeExpiry($pt_expiry);
1771
1772                                         if (!$expiry || $expiry > $now) {
1773                                                 // Apply the restrictions
1774                                                 $this->mRestrictionsExpiry = $expiry;
1775                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1776                                         } else { // Get rid of the old restrictions
1777                                                 Title::purgeExpiredRestrictions();
1778                                         }
1779                                 }
1780                                 $this->mRestrictionsLoaded = true;
1781                         }
1782                 }
1783         }
1784
1785         /**
1786          * Purge expired restrictions from the page_restrictions table
1787          */
1788         static function purgeExpiredRestrictions() {
1789                 $dbw = wfGetDB( DB_MASTER );
1790                 $dbw->delete( 'page_restrictions',
1791                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1792                         __METHOD__ );
1793
1794                 $dbw->delete( 'protected_titles',
1795                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1796                         __METHOD__ );
1797         }
1798
1799         /**
1800          * Accessor/initialisation for mRestrictions
1801          *
1802          * @param string $action action that permission needs to be checked for
1803          * @return array the array of groups allowed to edit this article
1804          */
1805         public function getRestrictions( $action ) {
1806                 if( !$this->mRestrictionsLoaded ) {
1807                         $this->loadRestrictions();
1808                 }
1809                 return isset( $this->mRestrictions[$action] )
1810                                 ? $this->mRestrictions[$action]
1811                                 : array();
1812         }
1813
1814         /**
1815          * Is there a version of this page in the deletion archive?
1816          * @return int the number of archived revisions
1817          */
1818         public function isDeleted() {
1819                 $fname = 'Title::isDeleted';
1820                 if ( $this->getNamespace() < 0 ) {
1821                         $n = 0;
1822                 } else {
1823                         $dbr = wfGetDB( DB_SLAVE );
1824                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1825                                 'ar_title' => $this->getDBkey() ), $fname );
1826                         if( $this->getNamespace() == NS_IMAGE ) {
1827                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1828                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1829                         }
1830                 }
1831                 return (int)$n;
1832         }
1833
1834         /**
1835          * Get the article ID for this Title from the link cache,
1836          * adding it if necessary
1837          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1838          *      for update
1839          * @return int the ID
1840          */
1841         public function getArticleID( $flags = 0 ) {
1842                 $linkCache = LinkCache::singleton();
1843                 if ( $flags & GAID_FOR_UPDATE ) {
1844                         $oldUpdate = $linkCache->forUpdate( true );
1845                         $this->mArticleID = $linkCache->addLinkObj( $this );
1846                         $linkCache->forUpdate( $oldUpdate );
1847                 } else {
1848                         if ( -1 == $this->mArticleID ) {
1849                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1850                         }
1851                 }
1852                 return $this->mArticleID;
1853         }
1854
1855         /**
1856          * Is this an article that is a redirect page?
1857          * Uses link cache, adding it if necessary
1858          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1859          * @return bool
1860          */
1861         public function isRedirect( $flags = 0 ) {
1862                 if( !is_null($this->mRedirect) )
1863                         return $this->mRedirect;
1864                 # Zero for special pages.
1865                 # Also, calling getArticleID() loads the field from cache!
1866                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1867                         return false;
1868                 }
1869                 $linkCache = LinkCache::singleton();
1870                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1871
1872                 return $this->mRedirect;
1873         }
1874
1875         /**
1876          * What is the length of this page?
1877          * Uses link cache, adding it if necessary
1878          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1879          * @return bool
1880          */
1881         public function getLength( $flags = 0 ) {
1882                 if( $this->mLength != -1 )
1883                         return $this->mLength;
1884                 # Zero for special pages.
1885                 # Also, calling getArticleID() loads the field from cache!
1886                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1887                         return 0;
1888                 }
1889                 $linkCache = LinkCache::singleton();
1890                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1891
1892                 return $this->mLength;
1893         }
1894
1895         /**
1896          * What is the page_latest field for this page?
1897          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1898          * @return int
1899          */
1900         public function getLatestRevID( $flags = 0 ) {
1901                 if ($this->mLatestID !== false)
1902                         return $this->mLatestID;
1903
1904                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1905                 return $this->mLatestID = $db->selectField( 'revision',
1906                         "max(rev_id)",
1907                         array('rev_page' => $this->getArticleID()),
1908                         'Title::getLatestRevID' );
1909         }
1910
1911         /**
1912          * This clears some fields in this object, and clears any associated
1913          * keys in the "bad links" section of the link cache.
1914          *
1915          * - This is called from Article::insertNewArticle() to allow
1916          * loading of the new page_id. It's also called from
1917          * Article::doDeleteArticle()
1918          *
1919          * @param int $newid the new Article ID
1920          */
1921         public function resetArticleID( $newid ) {
1922                 $linkCache = LinkCache::singleton();
1923                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1924
1925                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1926                 else { $this->mArticleID = $newid; }
1927                 $this->mRestrictionsLoaded = false;
1928                 $this->mRestrictions = array();
1929         }
1930
1931         /**
1932          * Updates page_touched for this page; called from LinksUpdate.php
1933          * @return bool true if the update succeded
1934          */
1935         public function invalidateCache() {
1936                 global $wgUseFileCache;
1937
1938                 if ( wfReadOnly() ) {
1939                         return;
1940                 }
1941
1942                 $dbw = wfGetDB( DB_MASTER );
1943                 $success = $dbw->update( 'page',
1944                         array( /* SET */
1945                                 'page_touched' => $dbw->timestamp()
1946                         ), array( /* WHERE */
1947                                 'page_namespace' => $this->getNamespace() ,
1948                                 'page_title' => $this->getDBkey()
1949                         ), 'Title::invalidateCache'
1950                 );
1951
1952                 if ($wgUseFileCache) {
1953                         $cache = new HTMLFileCache($this);
1954                         @unlink($cache->fileCacheName());
1955                 }
1956
1957                 return $success;
1958         }
1959
1960         /**
1961          * Prefix some arbitrary text with the namespace or interwiki prefix
1962          * of this object
1963          *
1964          * @param string $name the text
1965          * @return string the prefixed text
1966          * @private
1967          */
1968         /* private */ function prefix( $name ) {
1969                 $p = '';
1970                 if ( '' != $this->mInterwiki ) {
1971                         $p = $this->mInterwiki . ':';
1972                 }
1973                 if ( 0 != $this->mNamespace ) {
1974                         $p .= $this->getNsText() . ':';
1975                 }
1976                 return $p . $name;
1977         }
1978
1979         /**
1980          * Secure and split - main initialisation function for this object
1981          *
1982          * Assumes that mDbkeyform has been set, and is urldecoded
1983          * and uses underscores, but not otherwise munged.  This function
1984          * removes illegal characters, splits off the interwiki and
1985          * namespace prefixes, sets the other forms, and canonicalizes
1986          * everything.
1987          * @return bool true on success
1988          */
1989         private function secureAndSplit() {
1990                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1991
1992                 # Initialisation
1993                 static $rxTc = false;
1994                 if( !$rxTc ) {
1995                         # Matching titles will be held as illegal.
1996                         $rxTc = '/' .
1997                                 # Any character not allowed is forbidden...
1998                                 '[^' . Title::legalChars() . ']' .
1999                                 # URL percent encoding sequences interfere with the ability
2000                                 # to round-trip titles -- you can't link to them consistently.
2001                                 '|%[0-9A-Fa-f]{2}' .
2002                                 # XML/HTML character references produce similar issues.
2003                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2004                                 '|&#[0-9]+;' .
2005                                 '|&#x[0-9A-Fa-f]+;' .
2006                                 '/S';
2007                 }
2008
2009                 $this->mInterwiki = $this->mFragment = '';
2010                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2011
2012                 $dbkey = $this->mDbkeyform;
2013
2014                 # Strip Unicode bidi override characters.
2015                 # Sometimes they slip into cut-n-pasted page titles, where the
2016                 # override chars get included in list displays.
2017                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
2018                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
2019
2020                 # Clean up whitespace
2021                 #
2022                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2023                 $dbkey = trim( $dbkey, '_' );
2024
2025                 if ( '' == $dbkey ) {
2026                         return false;
2027                 }
2028
2029                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2030                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2031                         return false;
2032                 }
2033
2034                 $this->mDbkeyform = $dbkey;
2035
2036                 # Initial colon indicates main namespace rather than specified default
2037                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2038                 if ( ':' == $dbkey{0} ) {
2039                         $this->mNamespace = NS_MAIN;
2040                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2041                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2042                 }
2043
2044                 # Namespace or interwiki prefix
2045                 $firstPass = true;
2046                 do {
2047                         $m = array();
2048                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
2049                                 $p = $m[1];
2050                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
2051                                         # Ordinary namespace
2052                                         $dbkey = $m[2];
2053                                         $this->mNamespace = $ns;
2054                                 } elseif( $this->getInterwikiLink( $p ) ) {
2055                                         if( !$firstPass ) {
2056                                                 # Can't make a local interwiki link to an interwiki link.
2057                                                 # That's just crazy!
2058                                                 return false;
2059                                         }
2060
2061                                         # Interwiki link
2062                                         $dbkey = $m[2];
2063                                         $this->mInterwiki = $wgContLang->lc( $p );
2064
2065                                         # Redundant interwiki prefix to the local wiki
2066                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2067                                                 if( $dbkey == '' ) {
2068                                                         # Can't have an empty self-link
2069                                                         return false;
2070                                                 }
2071                                                 $this->mInterwiki = '';
2072                                                 $firstPass = false;
2073                                                 # Do another namespace split...
2074                                                 continue;
2075                                         }
2076
2077                                         # If there's an initial colon after the interwiki, that also
2078                                         # resets the default namespace
2079                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2080                                                 $this->mNamespace = NS_MAIN;
2081                                                 $dbkey = substr( $dbkey, 1 );
2082                                         }
2083                                 }
2084                                 # If there's no recognized interwiki or namespace,
2085                                 # then let the colon expression be part of the title.
2086                         }
2087                         break;
2088                 } while( true );
2089
2090                 # We already know that some pages won't be in the database!
2091                 #
2092                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2093                         $this->mArticleID = 0;
2094                 }
2095                 $fragment = strstr( $dbkey, '#' );
2096                 if ( false !== $fragment ) {
2097                         $this->setFragment( $fragment );
2098                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2099                         # remove whitespace again: prevents "Foo_bar_#"
2100                         # becoming "Foo_bar_"
2101                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2102                 }
2103
2104                 # Reject illegal characters.
2105                 #
2106                 if( preg_match( $rxTc, $dbkey ) ) {
2107                         return false;
2108                 }
2109
2110                 /**
2111                  * Pages with "/./" or "/../" appearing in the URLs will
2112                  * often be unreachable due to the way web browsers deal
2113                  * with 'relative' URLs. Forbid them explicitly.
2114                  */
2115                 if ( strpos( $dbkey, '.' ) !== false &&
2116                      ( $dbkey === '.' || $dbkey === '..' ||
2117                        strpos( $dbkey, './' ) === 0  ||
2118                        strpos( $dbkey, '../' ) === 0 ||
2119                        strpos( $dbkey, '/./' ) !== false ||
2120                        strpos( $dbkey, '/../' ) !== false  ||
2121                        substr( $dbkey, -2 ) == '/.' ||
2122                        substr( $dbkey, -3 ) == '/..' ) )
2123                 {
2124                         return false;
2125                 }
2126
2127                 /**
2128                  * Magic tilde sequences? Nu-uh!
2129                  */
2130                 if( strpos( $dbkey, '~~~' ) !== false ) {
2131                         return false;
2132                 }
2133
2134                 /**
2135                  * Limit the size of titles to 255 bytes.
2136                  * This is typically the size of the underlying database field.
2137                  * We make an exception for special pages, which don't need to be stored
2138                  * in the database, and may edge over 255 bytes due to subpage syntax
2139                  * for long titles, e.g. [[Special:Block/Long name]]
2140                  */
2141                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2142                   strlen( $dbkey ) > 512 )
2143                 {
2144                         return false;
2145                 }
2146
2147                 /**
2148                  * Normally, all wiki links are forced to have
2149                  * an initial capital letter so [[foo]] and [[Foo]]
2150                  * point to the same place.
2151                  *
2152                  * Don't force it for interwikis, since the other
2153                  * site might be case-sensitive.
2154                  */
2155                 $this->mUserCaseDBKey = $dbkey;
2156                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2157                         $dbkey = $wgContLang->ucfirst( $dbkey );
2158                 }
2159
2160                 /**
2161                  * Can't make a link to a namespace alone...
2162                  * "empty" local links can only be self-links
2163                  * with a fragment identifier.
2164                  */
2165                 if( $dbkey == '' &&
2166                         $this->mInterwiki == '' &&
2167                         $this->mNamespace != NS_MAIN ) {
2168                         return false;
2169                 }
2170                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2171                 // IP names are not allowed for accounts, and can only be referring to
2172                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2173                 // there are numerous ways to present the same IP. Having sp:contribs scan
2174                 // them all is silly and having some show the edits and others not is
2175                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2176                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2177                         IP::sanitizeIP( $dbkey ) : $dbkey;
2178                 // Any remaining initial :s are illegal.
2179                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2180                         return false;
2181                 }
2182
2183                 // Normalise special page names
2184                 if ( $this->mNamespace == NS_SPECIAL ) {
2185                         list( $name, $subpage ) = SpecialPage::resolveAliasWithSubpage( $dbkey );
2186                         $dbkey = SpecialPage::getLocalNameFor( $name, $subpage );
2187                 }
2188
2189
2190                 # Fill fields
2191                 $this->mDbkeyform = $dbkey;
2192                 $this->mUrlform = wfUrlencode( $dbkey );
2193
2194                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2195
2196                 return true;
2197         }
2198
2199         /**
2200          * Set the fragment for this title
2201          * This is kind of bad, since except for this rarely-used function, Title objects
2202          * are immutable. The reason this is here is because it's better than setting the
2203          * members directly, which is what Linker::formatComment was doing previously.
2204          *
2205          * @param string $fragment text
2206          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2207          */
2208         public function setFragment( $fragment ) {
2209                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2210         }
2211
2212         /**
2213          * Get a Title object associated with the talk page of this article
2214          * @return Title the object for the talk page
2215          */
2216         public function getTalkPage() {
2217                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2218         }
2219
2220         /**
2221          * Get a title object associated with the subject page of this
2222          * talk page
2223          *
2224          * @return Title the object for the subject page
2225          */
2226         public function getSubjectPage() {
2227                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2228         }
2229
2230         /**
2231          * Get an array of Title objects linking to this Title
2232          * Also stores the IDs in the link cache.
2233          *
2234          * WARNING: do not use this function on arbitrary user-supplied titles!
2235          * On heavily-used templates it will max out the memory.
2236          *
2237          * @param string $options may be FOR UPDATE
2238          * @return array the Title objects linking here
2239          */
2240         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2241                 $linkCache = LinkCache::singleton();
2242
2243                 if ( $options ) {
2244                         $db = wfGetDB( DB_MASTER );
2245                 } else {
2246                         $db = wfGetDB( DB_SLAVE );
2247                 }
2248
2249                 $res = $db->select( array( 'page', $table ),
2250                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2251                         array(
2252                                 "{$prefix}_from=page_id",
2253                                 "{$prefix}_namespace" => $this->getNamespace(),
2254                                 "{$prefix}_title"     => $this->getDBkey() ),
2255                         'Title::getLinksTo',
2256                         $options );
2257
2258                 $retVal = array();
2259                 if ( $db->numRows( $res ) ) {
2260                         while ( $row = $db->fetchObject( $res ) ) {
2261                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2262                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2263                                         $retVal[] = $titleObj;
2264                                 }
2265                         }
2266                 }
2267                 $db->freeResult( $res );
2268                 return $retVal;
2269         }
2270
2271         /**
2272          * Get an array of Title objects using this Title as a template
2273          * Also stores the IDs in the link cache.
2274          *
2275          * WARNING: do not use this function on arbitrary user-supplied titles!
2276          * On heavily-used templates it will max out the memory.
2277          *
2278          * @param string $options may be FOR UPDATE
2279          * @return array the Title objects linking here
2280          */
2281         public function getTemplateLinksTo( $options = '' ) {
2282                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2283         }
2284
2285         /**
2286          * Get an array of Title objects referring to non-existent articles linked from this page
2287          *
2288          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2289          * @param string $options may be FOR UPDATE
2290          * @return array the Title objects
2291          */
2292         public function getBrokenLinksFrom( $options = '' ) {
2293                 if ( $this->getArticleId() == 0 ) {
2294                         # All links from article ID 0 are false positives
2295                         return array();
2296                 }
2297
2298                 if ( $options ) {
2299                         $db = wfGetDB( DB_MASTER );
2300                 } else {
2301                         $db = wfGetDB( DB_SLAVE );
2302                 }
2303
2304                 $res = $db->safeQuery(
2305                           "SELECT pl_namespace, pl_title
2306                              FROM !
2307                         LEFT JOIN !
2308                                ON pl_namespace=page_namespace
2309                               AND pl_title=page_title
2310                             WHERE pl_from=?
2311                               AND page_namespace IS NULL
2312                                   !",
2313                         $db->tableName( 'pagelinks' ),
2314                         $db->tableName( 'page' ),
2315                         $this->getArticleId(),
2316                         $options );
2317
2318                 $retVal = array();
2319                 if ( $db->numRows( $res ) ) {
2320                         while ( $row = $db->fetchObject( $res ) ) {
2321                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2322                         }
2323                 }
2324                 $db->freeResult( $res );
2325                 return $retVal;
2326         }
2327
2328
2329         /**
2330          * Get a list of URLs to purge from the Squid cache when this
2331          * page changes
2332          *
2333          * @return array the URLs
2334          */
2335         public function getSquidURLs() {
2336                 global $wgContLang;
2337
2338                 $urls = array(
2339                         $this->getInternalURL(),
2340                         $this->getInternalURL( 'action=history' )
2341                 );
2342
2343                 // purge variant urls as well
2344                 if($wgContLang->hasVariants()){
2345                         $variants = $wgContLang->getVariants();
2346                         foreach($variants as $vCode){
2347                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2348                                 $urls[] = $this->getInternalURL('',$vCode);
2349                         }
2350                 }
2351
2352                 return $urls;
2353         }
2354
2355         public function purgeSquid() {
2356                 global $wgUseSquid;
2357                 if ( $wgUseSquid ) {
2358                         $urls = $this->getSquidURLs();
2359                         $u = new SquidUpdate( $urls );
2360                         $u->doUpdate();
2361                 }
2362         }
2363
2364         /**
2365          * Move this page without authentication
2366          * @param Title &$nt the new page Title
2367          */
2368         public function moveNoAuth( &$nt ) {
2369                 return $this->moveTo( $nt, false );
2370         }
2371
2372         /**
2373          * Check whether a given move operation would be valid.
2374          * Returns true if ok, or a message key string for an error message
2375          * if invalid. (Scarrrrry ugly interface this.)
2376          * @param Title &$nt the new title
2377          * @param bool $auth indicates whether $wgUser's permissions
2378          *      should be checked
2379          * @return mixed true on success, message name on failure
2380          */
2381         public function isValidMoveOperation( &$nt, $auth = true ) {
2382                 if( !$this or !$nt ) {
2383                         return 'badtitletext';
2384                 }
2385                 if( $this->equals( $nt ) ) {
2386                         return 'selfmove';
2387                 }
2388                 if( !$this->isMovable() || !$nt->isMovable() ) {
2389                         return 'immobile_namespace';
2390                 }
2391
2392                 $oldid = $this->getArticleID();
2393                 $newid = $nt->getArticleID();
2394
2395                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2396                         return 'articleexists';
2397                 }
2398                 if ( ( '' == $this->getDBkey() ) ||
2399                          ( !$oldid ) ||
2400                      ( '' == $nt->getDBkey() ) ) {
2401                         return 'badarticleerror';
2402                 }
2403
2404                 // Image-specific checks
2405                 if( $this->getNamespace() == NS_IMAGE ) {
2406                         $file = wfLocalFile( $this );
2407                         if( $file->exists() ) {
2408                                 if( $nt->getNamespace() != NS_IMAGE ) {
2409                                         return 'imagenocrossnamespace';
2410                                 }
2411                                 if( !File::checkExtensionCompatibility( $file, $nt->getDbKey() ) ) {
2412                                         return 'imagetypemismatch';
2413                                 }
2414                         }
2415                 }
2416
2417                 if ( $auth ) {
2418                         global $wgUser;
2419                         $errors = array_merge($this->getUserPermissionsErrors('move', $wgUser),
2420                                         $this->getUserPermissionsErrors('edit', $wgUser),
2421                                         $nt->getUserPermissionsErrors('move', $wgUser),
2422                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2423                         if($errors !== array())
2424                                 return $errors[0][0];
2425                 }
2426
2427                 global $wgUser;
2428                 $err = null;
2429                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2430                         return 'hookaborted';
2431                 }
2432
2433                 # The move is allowed only if (1) the target doesn't exist, or
2434                 # (2) the target is a redirect to the source, and has no history
2435                 # (so we can undo bad moves right after they're done).
2436
2437                 if ( 0 != $newid ) { # Target exists; check for validity
2438                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2439                                 return 'articleexists';
2440                         }
2441                 } else {
2442                         $tp = $nt->getTitleProtection();
2443                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2444                                 return 'cantmove-titleprotected';
2445                         }
2446                 }
2447                 return true;
2448         }
2449
2450         /**
2451          * Move a title to a new location
2452          * @param Title &$nt the new title
2453          * @param bool $auth indicates whether $wgUser's permissions
2454          *      should be checked
2455          * @param string $reason The reason for the move
2456          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2457          *  Ignored if the user doesn't have the suppressredirect right.
2458          * @return mixed true on success, message name on failure
2459          */
2460         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2461                 $err = $this->isValidMoveOperation( $nt, $auth );
2462                 if( is_string( $err ) ) {
2463                         return $err;
2464                 }
2465
2466                 $pageid = $this->getArticleID();
2467                 if( $nt->exists() ) {
2468                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2469                         $pageCountChange = ($createRedirect ? 0 : -1);
2470                 } else { # Target didn't exist, do normal move.
2471                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2472                         $pageCountChange = ($createRedirect ? 1 : 0);
2473                 }
2474                 if( is_string( $err ) ) {
2475                         return $err;
2476                 }
2477                 $redirid = $this->getArticleID();
2478
2479                 // Category memberships include a sort key which may be customized.
2480                 // If it's left as the default (the page title), we need to update
2481                 // the sort key to match the new title.
2482                 //
2483                 // Be careful to avoid resetting cl_timestamp, which may disturb
2484                 // time-based lists on some sites.
2485                 //
2486                 // Warning -- if the sort key is *explicitly* set to the old title,
2487                 // we can't actually distinguish it from a default here, and it'll
2488                 // be set to the new title even though it really shouldn't.
2489                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2490                 $dbw = wfGetDB( DB_MASTER );
2491                 $dbw->update( 'categorylinks',
2492                         array(
2493                                 'cl_sortkey' => $nt->getPrefixedText(),
2494                                 'cl_timestamp=cl_timestamp' ),
2495                         array(
2496                                 'cl_from' => $pageid,
2497                                 'cl_sortkey' => $this->getPrefixedText() ),
2498                         __METHOD__ );
2499
2500                 # Update watchlists
2501
2502                 $oldnamespace = $this->getNamespace() & ~1;
2503                 $newnamespace = $nt->getNamespace() & ~1;
2504                 $oldtitle = $this->getDBkey();
2505                 $newtitle = $nt->getDBkey();
2506
2507                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2508                         WatchedItem::duplicateEntries( $this, $nt );
2509                 }
2510
2511                 # Update search engine
2512                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2513                 $u->doUpdate();
2514                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2515                 $u->doUpdate();
2516
2517                 # Update site_stats
2518                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2519                         # No longer a content page
2520                         # Not viewed, edited, removing
2521                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2522                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2523                         # Now a content page
2524                         # Not viewed, edited, adding
2525                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2526                 } elseif( $pageCountChange ) {
2527                         # Redirect added
2528                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2529                 } else {
2530                         # Nothing special
2531                         $u = false;
2532                 }
2533                 if( $u )
2534                         $u->doUpdate();
2535                 # Update message cache for interface messages
2536                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2537                         global $wgMessageCache;
2538                         $oldarticle = new Article( $this );
2539                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2540                         $newarticle = new Article( $nt );
2541                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2542                 }
2543
2544                 global $wgUser;
2545                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2546                 return true;
2547         }
2548
2549         /**
2550          * Move page to a title which is at present a redirect to the
2551          * source page
2552          *
2553          * @param Title &$nt the page to move to, which should currently
2554          *      be a redirect
2555          * @param string $reason The reason for the move
2556          * @param bool $createRedirect Whether to leave a redirect at the old title.
2557          *  Ignored if the user doesn't have the suppressredirect right
2558          */
2559         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2560                 global $wgUseSquid, $wgUser;
2561                 $fname = 'Title::moveOverExistingRedirect';
2562                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2563
2564                 if ( $reason ) {
2565                         $comment .= ": $reason";
2566                 }
2567
2568                 $now = wfTimestampNow();
2569                 $newid = $nt->getArticleID();
2570                 $oldid = $this->getArticleID();
2571                 $dbw = wfGetDB( DB_MASTER );
2572
2573                 # Move an image if it is
2574                 if( $this->getNamespace() == NS_IMAGE ) {
2575                         $file = wfLocalFile( $this );
2576                         if( $file->exists() ) {
2577                                 $status = $file->move( $nt );
2578                                 if( !$status->isOk() ) {
2579                                         return $status->getWikiText();
2580                                 }
2581                         }
2582                 }
2583
2584                 # Delete the old redirect. We don't save it to history since
2585                 # by definition if we've got here it's rather uninteresting.
2586                 # We have to remove it so that the next step doesn't trigger
2587                 # a conflict on the unique namespace+title index...
2588                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2589                 if ( !$dbw->cascadingDeletes() ) {
2590                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2591                         global $wgUseTrackbacks;
2592                         if ($wgUseTrackbacks)
2593                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2594                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2595                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2596                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2597                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2598                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2599                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2600                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2601                 }
2602
2603                 # Save a null revision in the page's history notifying of the move
2604                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2605                 $nullRevId = $nullRevision->insertOn( $dbw );
2606
2607                 # Change the name of the target page:
2608                 $dbw->update( 'page',
2609                         /* SET */ array(
2610                                 'page_touched'   => $dbw->timestamp($now),
2611                                 'page_namespace' => $nt->getNamespace(),
2612                                 'page_title'     => $nt->getDBkey(),
2613                                 'page_latest'    => $nullRevId,
2614                         ),
2615                         /* WHERE */ array( 'page_id' => $oldid ),
2616                         $fname
2617                 );
2618                 $nt->resetArticleID( $oldid );
2619
2620                 # Recreate the redirect, this time in the other direction.
2621                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2622                 {
2623                         $mwRedir = MagicWord::get( 'redirect' );
2624                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2625                         $redirectArticle = new Article( $this );
2626                         $newid = $redirectArticle->insertOn( $dbw );
2627                         $redirectRevision = new Revision( array(
2628                                 'page'    => $newid,
2629                                 'comment' => $comment,
2630                                 'text'    => $redirectText ) );
2631                         $redirectRevision->insertOn( $dbw );
2632                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2633
2634                         # Now, we record the link from the redirect to the new title.
2635                         # It should have no other outgoing links...
2636                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2637                         $dbw->insert( 'pagelinks',
2638                                 array(
2639                                         'pl_from'      => $newid,
2640                                         'pl_namespace' => $nt->getNamespace(),
2641                                         'pl_title'     => $nt->getDBkey() ),
2642                                 $fname );
2643                 } else {
2644                         $this->resetArticleID( 0 );
2645                 }
2646
2647                 # Log the move
2648                 $log = new LogPage( 'move' );
2649                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2650
2651                 # Purge squid
2652                 if ( $wgUseSquid ) {
2653                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2654                         $u = new SquidUpdate( $urls );
2655                         $u->doUpdate();
2656                 }
2657         }
2658
2659         /**
2660          * Move page to non-existing title.
2661          * @param Title &$nt the new Title
2662          * @param string $reason The reason for the move
2663          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2664          *  Ignored if the user doesn't have the suppressredirect right
2665          */
2666         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2667                 global $wgUseSquid, $wgUser;
2668                 $fname = 'MovePageForm::moveToNewTitle';
2669                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2670                 if ( $reason ) {
2671                         $comment .= ": $reason";
2672                 }
2673
2674                 $newid = $nt->getArticleID();
2675                 $oldid = $this->getArticleID();
2676                 $dbw = wfGetDB( DB_MASTER );
2677                 $now = $dbw->timestamp();
2678
2679                 # Move an image if it is
2680                 if( $this->getNamespace() == NS_IMAGE ) {
2681                         $file = wfLocalFile( $this );
2682                         if( $file->exists() ) {
2683                                 $status = $file->move( $nt );
2684                                 if( !$status->isOk() ) {
2685                                         return $status->getWikiText();
2686                                 }
2687                         }
2688                 }
2689
2690                 # Save a null revision in the page's history notifying of the move
2691                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2692                 $nullRevId = $nullRevision->insertOn( $dbw );
2693
2694                 # Rename page entry
2695                 $dbw->update( 'page',
2696                         /* SET */ array(
2697                                 'page_touched'   => $now,
2698                                 'page_namespace' => $nt->getNamespace(),
2699                                 'page_title'     => $nt->getDBkey(),
2700                                 'page_latest'    => $nullRevId,
2701                         ),
2702                         /* WHERE */ array( 'page_id' => $oldid ),
2703                         $fname
2704                 );
2705                 $nt->resetArticleID( $oldid );
2706
2707                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2708                 {
2709                         # Insert redirect
2710                         $mwRedir = MagicWord::get( 'redirect' );
2711                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2712                         $redirectArticle = new Article( $this );
2713                         $newid = $redirectArticle->insertOn( $dbw );
2714                         $redirectRevision = new Revision( array(
2715                                 'page'    => $newid,
2716                                 'comment' => $comment,
2717                                 'text'    => $redirectText ) );
2718                         $redirectRevision->insertOn( $dbw );
2719                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2720
2721                         # Record the just-created redirect's linking to the page
2722                         $dbw->insert( 'pagelinks',
2723                                 array(
2724                                         'pl_from'      => $newid,
2725                                         'pl_namespace' => $nt->getNamespace(),
2726                                         'pl_title'     => $nt->getDBkey() ),
2727                                 $fname );
2728                 } else {
2729                         $this->resetArticleID( 0 );
2730                 }
2731
2732                 # Log the move
2733                 $log = new LogPage( 'move' );
2734                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2735
2736                 # Purge caches as per article creation
2737                 Article::onArticleCreate( $nt );
2738
2739                 # Purge old title from squid
2740                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2741                 $this->purgeSquid();
2742         }
2743
2744         /**
2745          * Checks if $this can be moved to a given Title
2746          * - Selects for update, so don't call it unless you mean business
2747          *
2748          * @param Title &$nt the new title to check
2749          */
2750         public function isValidMoveTarget( $nt ) {
2751
2752                 $fname = 'Title::isValidMoveTarget';
2753                 $dbw = wfGetDB( DB_MASTER );
2754
2755                 # Is it an existsing file?
2756                 if( $nt->getNamespace() == NS_IMAGE ) {
2757                         $file = wfLocalFile( $nt );
2758                         if( $file->exists() ) {
2759                                 wfDebug( __METHOD__ . ": file exists\n" );
2760                                 return false;
2761                         }
2762                 }
2763
2764                 # Is it a redirect?
2765                 $id  = $nt->getArticleID();
2766                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2767                         array( 'page_is_redirect','old_text','old_flags' ),
2768                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2769                         $fname, 'FOR UPDATE' );
2770
2771                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2772                         # Not a redirect
2773                         wfDebug( __METHOD__ . ": not a redirect\n" );
2774                         return false;
2775                 }
2776                 $text = Revision::getRevisionText( $obj );
2777
2778                 # Does the redirect point to the source?
2779                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2780                 $m = array();
2781                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2782                         $redirTitle = Title::newFromText( $m[1] );
2783                         if( !is_object( $redirTitle ) ||
2784                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2785                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2786                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2787                                 return false;
2788                         }
2789                 } else {
2790                         # Fail safe
2791                         wfDebug( __METHOD__ . ": failsafe\n" );
2792                         return false;
2793                 }
2794
2795                 # Does the article have a history?
2796                 $row = $dbw->selectRow( array( 'page', 'revision'),
2797                         array( 'rev_id' ),
2798                         array( 'page_namespace' => $nt->getNamespace(),
2799                                 'page_title' => $nt->getDBkey(),
2800                                 'page_id=rev_page AND page_latest != rev_id'
2801                         ), $fname, 'FOR UPDATE'
2802                 );
2803
2804                 # Return true if there was no history
2805                 return $row === false;
2806         }
2807
2808         /**
2809          * Can this title be added to a user's watchlist?
2810          *
2811          * @return bool
2812          */
2813         public function isWatchable() {
2814                 return !$this->isExternal()
2815                         && MWNamespace::isWatchable( $this->getNamespace() );
2816         }
2817
2818         /**
2819          * Get categories to which this Title belongs and return an array of
2820          * categories' names.
2821          *
2822          * @return array an array of parents in the form:
2823          *      $parent => $currentarticle
2824          */
2825         public function getParentCategories() {
2826                 global $wgContLang;
2827
2828                 $titlekey = $this->getArticleId();
2829                 $dbr = wfGetDB( DB_SLAVE );
2830                 $categorylinks = $dbr->tableName( 'categorylinks' );
2831
2832                 # NEW SQL
2833                 $sql = "SELECT * FROM $categorylinks"
2834                      ." WHERE cl_from='$titlekey'"
2835                          ." AND cl_from <> '0'"
2836                          ." ORDER BY cl_sortkey";
2837
2838                 $res = $dbr->query ( $sql ) ;
2839
2840                 if($dbr->numRows($res) > 0) {
2841                         while ( $x = $dbr->fetchObject ( $res ) )
2842                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2843                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2844                         $dbr->freeResult ( $res ) ;
2845                 } else {
2846                         $data = array();
2847                 }
2848                 return $data;
2849         }
2850
2851         /**
2852          * Get a tree of parent categories
2853          * @param array $children an array with the children in the keys, to check for circular refs
2854          * @return array
2855          */
2856         public function getParentCategoryTree( $children = array() ) {
2857                 $stack = array();
2858                 $parents = $this->getParentCategories();
2859
2860                 if($parents != '') {
2861                         foreach($parents as $parent => $current) {
2862                                 if ( array_key_exists( $parent, $children ) ) {
2863                                         # Circular reference
2864                                         $stack[$parent] = array();
2865                                 } else {
2866                                         $nt = Title::newFromText($parent);
2867                                         if ( $nt ) {
2868                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2869                                         }
2870                                 }
2871                         }
2872                         return $stack;
2873                 } else {
2874                         return array();
2875                 }
2876         }
2877
2878
2879         /**
2880          * Get an associative array for selecting this title from
2881          * the "page" table
2882          *
2883          * @return array
2884          */
2885         public function pageCond() {
2886                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2887         }
2888
2889         /**
2890          * Get the revision ID of the previous revision
2891          *
2892          * @param integer $revision  Revision ID. Get the revision that was before this one.
2893          * @return integer $oldrevision|false
2894          */
2895         public function getPreviousRevisionID( $revision ) {
2896                 $dbr = wfGetDB( DB_SLAVE );
2897                 return $dbr->selectField( 'revision', 'rev_id',
2898                         'rev_page=' . intval( $this->getArticleId() ) .
2899                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2900         }
2901
2902         /**
2903          * Get the revision ID of the next revision
2904          *
2905          * @param integer $revision  Revision ID. Get the revision that was after this one.
2906          * @return integer $oldrevision|false
2907          */
2908         public function getNextRevisionID( $revision ) {
2909                 $dbr = wfGetDB( DB_SLAVE );
2910                 return $dbr->selectField( 'revision', 'rev_id',
2911                         'rev_page=' . intval( $this->getArticleId() ) .
2912                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2913         }
2914
2915         /**
2916          * Get the number of revisions between the given revision IDs.
2917          * Used for diffs and other things that really need it.
2918          *
2919          * @param integer $old  Revision ID.
2920          * @param integer $new  Revision ID.
2921          * @return integer  Number of revisions between these IDs.
2922          */
2923         public function countRevisionsBetween( $old, $new ) {
2924                 $dbr = wfGetDB( DB_SLAVE );
2925                 return $dbr->selectField( 'revision', 'count(*)',
2926                         'rev_page = ' . intval( $this->getArticleId() ) .
2927                         ' AND rev_id > ' . intval( $old ) .
2928                         ' AND rev_id < ' . intval( $new ),
2929                         __METHOD__,
2930                         array( 'USE INDEX' => 'PRIMARY' ) );
2931         }
2932
2933         /**
2934          * Compare with another title.
2935          *
2936          * @param Title $title
2937          * @return bool
2938          */
2939         public function equals( $title ) {
2940                 // Note: === is necessary for proper matching of number-like titles.
2941                 return $this->getInterwiki() === $title->getInterwiki()
2942                         && $this->getNamespace() == $title->getNamespace()
2943                         && $this->getDBkey() === $title->getDBkey();
2944         }
2945
2946         /**
2947          * Callback for usort() to do title sorts by (namespace, title)
2948          */
2949         static function compare( $a, $b ) {
2950                 if( $a->getNamespace() == $b->getNamespace() ) {
2951                         return strcmp( $a->getText(), $b->getText() );
2952                 } else {
2953                         return $a->getNamespace() - $b->getNamespace();
2954                 }
2955         }
2956
2957         /**
2958          * Return a string representation of this title
2959          *
2960          * @return string
2961          */
2962         public function __toString() {
2963                 return $this->getPrefixedText();
2964         }
2965
2966         /**
2967          * Check if page exists
2968          * @return bool
2969          */
2970         public function exists() {
2971                 return $this->getArticleId() != 0;
2972         }
2973
2974         /**
2975          * Do we know that this title definitely exists, or should we otherwise
2976          * consider that it exists?
2977          *
2978          * @return bool
2979          */
2980         public function isAlwaysKnown() {
2981                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2982                 // the full l10n of that language to be loaded. That takes much memory and
2983                 // isn't needed. So we strip the language part away.
2984                 // Also, extension messages which are not loaded, are shown as red, because
2985                 // we don't call MessageCache::loadAllMessages.
2986                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2987                 return $this->isExternal()
2988                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2989                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2990         }
2991
2992         /**
2993          * Update page_touched timestamps and send squid purge messages for
2994          * pages linking to this title. May be sent to the job queue depending
2995          * on the number of links. Typically called on create and delete.
2996          */
2997         public function touchLinks() {
2998                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2999                 $u->doUpdate();
3000
3001                 if ( $this->getNamespace() == NS_CATEGORY ) {
3002                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3003                         $u->doUpdate();
3004                 }
3005         }
3006
3007         /**
3008          * Get the last touched timestamp
3009          */
3010         public function getTouched() {
3011                 $dbr = wfGetDB( DB_SLAVE );
3012                 $touched = $dbr->selectField( 'page', 'page_touched',
3013                         array(
3014                                 'page_namespace' => $this->getNamespace(),
3015                                 'page_title' => $this->getDBkey()
3016                         ), __METHOD__
3017                 );
3018                 return $touched;
3019         }
3020
3021         public function trackbackURL() {
3022                 global $wgTitle, $wgScriptPath, $wgServer;
3023
3024                 return "$wgServer$wgScriptPath/trackback.php?article="
3025                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
3026         }
3027
3028         public function trackbackRDF() {
3029                 $url = htmlspecialchars($this->getFullURL());
3030                 $title = htmlspecialchars($this->getText());
3031                 $tburl = $this->trackbackURL();
3032
3033                 // Autodiscovery RDF is placed in comments so HTML validator
3034                 // won't barf. This is a rather icky workaround, but seems
3035                 // frequently used by this kind of RDF thingy.
3036                 //
3037                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3038                 return "<!--
3039 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3040          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3041          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3042 <rdf:Description
3043    rdf:about=\"$url\"
3044    dc:identifier=\"$url\"
3045    dc:title=\"$title\"
3046    trackback:ping=\"$tburl\" />
3047 </rdf:RDF>
3048 -->";
3049         }
3050
3051         /**
3052          * Generate strings used for xml 'id' names in monobook tabs
3053          * @return string
3054          */
3055         public function getNamespaceKey() {
3056                 global $wgContLang;
3057                 switch ($this->getNamespace()) {
3058                         case NS_MAIN:
3059                         case NS_TALK:
3060                                 return 'nstab-main';
3061                         case NS_USER:
3062                         case NS_USER_TALK:
3063                                 return 'nstab-user';
3064                         case NS_MEDIA:
3065                                 return 'nstab-media';
3066                         case NS_SPECIAL:
3067                                 return 'nstab-special';
3068                         case NS_PROJECT:
3069                         case NS_PROJECT_TALK:
3070                                 return 'nstab-project';
3071                         case NS_IMAGE:
3072                         case NS_IMAGE_TALK:
3073                                 return 'nstab-image';
3074                         case NS_MEDIAWIKI:
3075                         case NS_MEDIAWIKI_TALK:
3076                                 return 'nstab-mediawiki';
3077                         case NS_TEMPLATE:
3078                         case NS_TEMPLATE_TALK:
3079                                 return 'nstab-template';
3080                         case NS_HELP:
3081                         case NS_HELP_TALK:
3082                                 return 'nstab-help';
3083                         case NS_CATEGORY:
3084                         case NS_CATEGORY_TALK:
3085                                 return 'nstab-category';
3086                         default:
3087                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3088                 }
3089         }
3090
3091         /**
3092          * Returns true if this title resolves to the named special page
3093          * @param string $name The special page name
3094          */
3095         public function isSpecial( $name ) {
3096                 if ( $this->getNamespace() == NS_SPECIAL ) {
3097                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3098                         if ( $name == $thisName ) {
3099                                 return true;
3100                         }
3101                 }
3102                 return false;
3103         }
3104
3105         /**
3106          * If the Title refers to a special page alias which is not the local default,
3107          * returns a new Title which points to the local default. Otherwise, returns $this.
3108          */
3109         public function fixSpecialName() {
3110                 if ( $this->getNamespace() == NS_SPECIAL ) {
3111                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3112                         if ( $canonicalName ) {
3113                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3114                                 if ( $localName != $this->mDbkeyform ) {
3115                                         return Title::makeTitle( NS_SPECIAL, $localName );
3116                                 }
3117                         }
3118                 }
3119                 return $this;
3120         }
3121
3122         /**
3123          * Is this Title in a namespace which contains content?
3124          * In other words, is this a content page, for the purposes of calculating
3125          * statistics, etc?
3126          *
3127          * @return bool
3128          */
3129         public function isContentPage() {
3130                 return MWNamespace::isContent( $this->getNamespace() );
3131         }
3132
3133         public function getRedirectsHere() {
3134                 $redirs = array();
3135                 $dbr = wfGetDB( DB_SLAVE );
3136                 list($page,$redirect) = $dbr->tableNamesN( 'page', 'redirect' );
3137                 $result = $dbr->query( "SELECT page_title, page_namespace FROM $page JOIN $redirect ON page_id = rd_from WHERE rd_title = "
3138                         . $dbr->addQuotes( $this->getDBKey() ) . " AND rd_namespace = " . $this->getNamespace(), __METHOD__ );
3139                 while( $row = $dbr->fetchObject( $result ) ) {
3140                         $redirs[] = self::newFromRow( $row );
3141                 }
3142                 return $redirs;
3143         }
3144 }