includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 if ( !class_exists( 'UtfNormal' ) ) {
   8         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9 }
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 /**
  14  * Title::newFromText maintains a cache to avoid expensive re-normalization of
  15  * commonly used titles. On a batch operation this can become a memory leak
  16  * if not bounded. After hitting this many titles reset the cache.
  17  */
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 /**
  21  * Constants for pr_cascade bitfield
  22  */
  23 define( 'CASCADE', 1 );
  24
  25 /**
  26  * Title class
  27  * - Represents a title, which may contain an interwiki designation or namespace
  28  * - Can fetch various kinds of data from the database, albeit inefficiently.
  29  *
  30  */
  31 class Title {
  32         /**
  33          * Static cache variables
  34          */
  35         static private $titleCache=array();
  36         static private $interwikiCache=array();
  37
  38
  39         /**
  40          * All member variables should be considered private
  41          * Please use the accessor functions
  42          */
  43
  44         /**#@+
  45          * @private
  46          */
  47
  48         var $mTextform = '';              # Text form (spaces not underscores) of the main part
  49         var $mUrlform = '';               # URL-encoded form of the main part
  50         var $mDbkeyform = '';             # Main part with underscores
  51         var $mUserCaseDBKey;              # DB key with the initial letter in the case specified by the user
  52         var $mNamespace = NS_MAIN;        # Namespace index, i.e. one of the NS_xxxx constants
  53         var $mInterwiki = '';             # Interwiki prefix (or null string)
  54         var $mFragment;                       # Title fragment (i.e. the bit after the #)
  55         var $mArticleID = -1;             # Article ID, fetched from the link cache on demand
  56         var $mLatestID = false;           # ID of most recent revision
  57         var $mRestrictions = array();     # Array of groups allowed to edit this article
  58         var $mOldRestrictions = false;
  59         var $mCascadeRestriction;             # Cascade restrictions on this page to included templates and images?
  60         var $mRestrictionsExpiry;             # When do the restrictions on this page expire?
  61         var $mHasCascadingRestrictions;   # Are cascading restrictions in effect on this page?
  62         var $mCascadeRestrictionSources;  # Where are the cascading restrictions coming from on this page?
  63         var $mRestrictionsLoaded = false; # Boolean for initialisation on demand
  64         var $mPrefixedText;                   # Text form including namespace/interwiki, initialised on demand
  65         # Don't change the following default, NS_MAIN is hardcoded in several
  66         # places.  See bug 696.
  67         var $mDefaultNamespace = NS_MAIN; # Namespace index when there is no namespace
  68                                               # Zero except in {{transclusion}} tags
  69         var $mWatched = null;                     # Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  70         var $mLength = -1;                # The page length, 0 for special pages
  71         var $mRedirect = null;            # Is the article at this title a redirect?
  72         /**#@-*/
  73
  74
  75         /**
  76          * Constructor
  77          * @private
  78          */
  79         /* private */ function __construct() {}
  80
  81         /**
  82          * Create a new Title from a prefixed DB key
  83          * @param string $key The database key, which has underscores
  84          *      instead of spaces, possibly including namespace and
  85          *      interwiki prefixes
  86          * @return Title the new object, or NULL on an error
  87          */
  88         public static function newFromDBkey( $key ) {
  89                 $t = new Title();
  90                 $t->mDbkeyform = $key;
  91                 if( $t->secureAndSplit() )
  92                         return $t;
  93                 else
  94                         return NULL;
  95         }
  96
  97         /**
  98          * Create a new Title from text, such as what one would
  99          * find in a link. Decodes any HTML entities in the text.
 100          *
 101          * @param string $text the link text; spaces, prefixes,
 102          *      and an initial ':' indicating the main namespace
 103          *      are accepted
 104          * @param int $defaultNamespace the namespace to use if
 105          *      none is specified by a prefix
 106          * @return Title the new object, or NULL on an error
 107          */
 108         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 109                 if( is_object( $text ) ) {
 110                         throw new MWException( 'Title::newFromText given an object' );
 111                 }
 112
 113                 /**
 114                  * Wiki pages often contain multiple links to the same page.
 115                  * Title normalization and parsing can become expensive on
 116                  * pages with many links, so we can save a little time by
 117                  * caching them.
 118                  *
 119                  * In theory these are value objects and won't get changed...
 120                  */
 121                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 122                         return Title::$titleCache[$text];
 123                 }
 124
 125                 /**
 126                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 127                  */
 128                 $filteredText = Sanitizer::decodeCharReferences( $text );
 129
 130                 $t = new Title();
 131                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 132                 $t->mDefaultNamespace = $defaultNamespace;
 133
 134                 static $cachedcount = 0 ;
 135                 if( $t->secureAndSplit() ) {
 136                         if( $defaultNamespace == NS_MAIN ) {
 137                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 138                                         # Avoid memory leaks on mass operations...
 139                                         Title::$titleCache = array();
 140                                         $cachedcount=0;
 141                                 }
 142                                 $cachedcount++;
 143                                 Title::$titleCache[$text] =& $t;
 144                         }
 145                         return $t;
 146                 } else {
 147                         $ret = NULL;
 148                         return $ret;
 149                 }
 150         }
 151
 152         /**
 153          * Create a new Title from URL-encoded text. Ensures that
 154          * the given title's length does not exceed the maximum.
 155          * @param string $url the title, as might be taken from a URL
 156          * @return Title the new object, or NULL on an error
 157          */
 158         public static function newFromURL( $url ) {
 159                 global $wgLegalTitleChars;
 160                 $t = new Title();
 161
 162                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 163                 # but some URLs used it as a space replacement and they still come
 164                 # from some external search tools.
 165                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 166                         $url = str_replace( '+', ' ', $url );
 167                 }
 168
 169                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 170                 if( $t->secureAndSplit() ) {
 171                         return $t;
 172                 } else {
 173                         return NULL;
 174                 }
 175         }
 176
 177         /**
 178          * Create a new Title from an article ID
 179          *
 180          * @todo This is inefficiently implemented, the page row is requested
 181          *       but not used for anything else
 182          *
 183          * @param int $id the page_id corresponding to the Title to create
 184          * @param int $flags, use GAID_FOR_UPDATE to use master
 185          * @return Title the new object, or NULL on an error
 186          */
 187         public static function newFromID( $id, $flags = 0 ) {
 188                 $fname = 'Title::newFromID';
 189                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 190                 $row = $db->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 191                         array( 'page_id' => $id ), $fname );
 192                 if ( $row !== false ) {
 193                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 194                 } else {
 195                         $title = NULL;
 196                 }
 197                 return $title;
 198         }
 199
 200         /**
 201          * Make an array of titles from an array of IDs
 202          */
 203         public static function newFromIDs( $ids ) {
 204                 if ( !count( $ids ) ) {
 205                         return array();
 206                 }
 207                 $dbr = wfGetDB( DB_SLAVE );
 208                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 209                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 210
 211                 $titles = array();
 212                 foreach( $res as $row ) {
 213                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 214                 }
 215                 return $titles;
 216         }
 217
 218         /**
 219          * Make a Title object from a DB row
 220          * @param Row $row (needs at least page_title,page_namespace)
 221          */
 222         public static function newFromRow( $row ) {
 223                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 224
 225                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 226                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 227                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 228                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 229
 230                 return $t;
 231         }
 232
 233         /**
 234          * Create a new Title from a namespace index and a DB key.
 235          * It's assumed that $ns and $title are *valid*, for instance when
 236          * they came directly from the database or a special page name.
 237          * For convenience, spaces are converted to underscores so that
 238          * eg user_text fields can be used directly.
 239          *
 240          * @param int $ns the namespace of the article
 241          * @param string $title the unprefixed database key form
 242          * @param string $fragment The link fragment (after the "#")
 243          * @return Title the new object
 244          */
 245         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 246                 $t = new Title();
 247                 $t->mInterwiki = '';
 248                 $t->mFragment = $fragment;
 249                 $t->mNamespace = $ns = intval( $ns );
 250                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 251                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 252                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 253                 $t->mTextform = str_replace( '_', ' ', $title );
 254                 return $t;
 255         }
 256
 257         /**
 258          * Create a new Title from a namespace index and a DB key.
 259          * The parameters will be checked for validity, which is a bit slower
 260          * than makeTitle() but safer for user-provided data.
 261          *
 262          * @param int $ns the namespace of the article
 263          * @param string $title the database key form
 264          * @param string $fragment The link fragment (after the "#")
 265          * @return Title the new object, or NULL on an error
 266          */
 267         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 268                 $t = new Title();
 269                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 270                 if( $t->secureAndSplit() ) {
 271                         return $t;
 272                 } else {
 273                         return NULL;
 274                 }
 275         }
 276
 277         /**
 278          * Create a new Title for the Main Page
 279          * @return Title the new object
 280          */
 281         public static function newMainPage() {
 282                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 283                 // Don't give fatal errors if the message is broken
 284                 if ( !$title ) {
 285                         $title = Title::newFromText( 'Main Page' );
 286                 }
 287                 return $title;
 288         }
 289
 290         /**
 291          * Extract a redirect destination from a string and return the
 292          * Title, or null if the text doesn't contain a valid redirect
 293          *
 294          * @param string $text Text with possible redirect
 295          * @return Title
 296          */
 297         public static function newFromRedirect( $text ) {
 298                 $redir = MagicWord::get( 'redirect' );
 299                 if( $redir->matchStart( trim($text) ) ) {
 300                         // Extract the first link and see if it's usable
 301                         $m = array();
 302                         if( preg_match( '!\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 303                                 // Strip preceding colon used to "escape" categories, etc.
 304                                 // and URL-decode links
 305                                 if( strpos( $m[1], '%' ) !== false ) {
 306                                         // Match behavior of inline link parsing here;
 307                                         // don't interpret + as " " most of the time!
 308                                         // It might be safe to just use rawurldecode instead, though.
 309                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 310                                 }
 311                                 $title = Title::newFromText( $m[1] );
 312                                 // Redirects to Special:Userlogout are not permitted
 313                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 314                                         return $title;
 315                         }
 316                 }
 317                 return null;
 318         }
 319
 320 #----------------------------------------------------------------------------
 321 #       Static functions
 322 #----------------------------------------------------------------------------
 323
 324         /**
 325          * Get the prefixed DB key associated with an ID
 326          * @param int $id the page_id of the article
 327          * @return Title an object representing the article, or NULL
 328          *      if no such article was found
 329          */
 330         public static function nameOf( $id ) {
 331                 $dbr = wfGetDB( DB_SLAVE );
 332
 333                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), __METHOD__ );
 334                 if ( $s === false ) { return NULL; }
 335
 336                 $n = self::makeName( $s->page_namespace, $s->page_title );
 337                 return $n;
 338         }
 339
 340         /**
 341          * Get a regex character class describing the legal characters in a link
 342          * @return string the list of characters, not delimited
 343          */
 344         public static function legalChars() {
 345                 global $wgLegalTitleChars;
 346                 return $wgLegalTitleChars;
 347         }
 348
 349         /**
 350          * Get a string representation of a title suitable for
 351          * including in a search index
 352          *
 353          * @param int $ns a namespace index
 354          * @param string $title text-form main part
 355          * @return string a stripped-down title string ready for the
 356          *      search index
 357          */
 358         public static function indexTitle( $ns, $title ) {
 359                 global $wgContLang;
 360
 361                 $lc = SearchEngine::legalSearchChars() . '&#;';
 362                 $t = $wgContLang->stripForSearch( $title );
 363                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 364                 $t = $wgContLang->lc( $t );
 365
 366                 # Handle 's, s'
 367                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 368                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 369
 370                 $t = preg_replace( "/\\s+/", ' ', $t );
 371
 372                 if ( $ns == NS_IMAGE ) {
 373                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 374                 }
 375                 return trim( $t );
 376         }
 377
 378         /*
 379          * Make a prefixed DB key from a DB key and a namespace index
 380          * @param int $ns numerical representation of the namespace
 381          * @param string $title the DB key form the title
 382          * @param string $fragment The link fragment (after the "#")
 383          * @return string the prefixed form of the title
 384          */
 385         public static function makeName( $ns, $title, $fragment = '' ) {
 386                 global $wgContLang;
 387
 388                 $namespace = $wgContLang->getNsText( $ns );
 389                 $name = $namespace == '' ? $title : "$namespace:$title";
 390                 if ( strval( $fragment ) != '' ) {
 391                         $name .= '#' . $fragment;
 392                 }
 393                 return $name;
 394         }
 395
 396         /**
 397          * Returns the URL associated with an interwiki prefix
 398          * @param string $key the interwiki prefix (e.g. "MeatBall")
 399          * @return the associated URL, containing "$1", which should be
 400          *      replaced by an article title
 401          * @static (arguably)
 402          */
 403         public function getInterwikiLink( $key )  {
 404                 global $wgMemc, $wgInterwikiExpiry;
 405                 global $wgInterwikiCache, $wgContLang;
 406                 $fname = 'Title::getInterwikiLink';
 407
 408                 $key = $wgContLang->lc( $key );
 409
 410                 $k = wfMemcKey( 'interwiki', $key );
 411                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 412                         return Title::$interwikiCache[$k]->iw_url;
 413                 }
 414
 415                 if ($wgInterwikiCache) {
 416                         return Title::getInterwikiCached( $key );
 417                 }
 418
 419                 $s = $wgMemc->get( $k );
 420                 # Ignore old keys with no iw_local
 421                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 422                         Title::$interwikiCache[$k] = $s;
 423                         return $s->iw_url;
 424                 }
 425
 426                 $dbr = wfGetDB( DB_SLAVE );
 427                 $res = $dbr->select( 'interwiki',
 428                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 429                         array( 'iw_prefix' => $key ), $fname );
 430                 if( !$res ) {
 431                         return '';
 432                 }
 433
 434                 $s = $dbr->fetchObject( $res );
 435                 if( !$s ) {
 436                         # Cache non-existence: create a blank object and save it to memcached
 437                         $s = (object)false;
 438                         $s->iw_url = '';
 439                         $s->iw_local = 0;
 440                         $s->iw_trans = 0;
 441                 }
 442                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 443                 Title::$interwikiCache[$k] = $s;
 444
 445                 return $s->iw_url;
 446         }
 447
 448         /**
 449          * Fetch interwiki prefix data from local cache in constant database
 450          *
 451          * More logic is explained in DefaultSettings
 452          *
 453          * @return string URL of interwiki site
 454          */
 455         public static function getInterwikiCached( $key ) {
 456                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 457                 static $db, $site;
 458
 459                 if (!$db)
 460                         $db=dba_open($wgInterwikiCache,'r','cdb');
 461                 /* Resolve site name */
 462                 if ($wgInterwikiScopes>=3 and !$site) {
 463                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 464                         if ($site=="")
 465                                 $site = $wgInterwikiFallbackSite;
 466                 }
 467                 $value = dba_fetch( wfMemcKey( $key ), $db);
 468                 if ($value=='' and $wgInterwikiScopes>=3) {
 469                         /* try site-level */
 470                         $value = dba_fetch("_{$site}:{$key}", $db);
 471                 }
 472                 if ($value=='' and $wgInterwikiScopes>=2) {
 473                         /* try globals */
 474                         $value = dba_fetch("__global:{$key}", $db);
 475                 }
 476                 if ($value=='undef')
 477                         $value='';
 478                 $s = (object)false;
 479                 $s->iw_url = '';
 480                 $s->iw_local = 0;
 481                 $s->iw_trans = 0;
 482                 if ($value!='') {
 483                         list($local,$url)=explode(' ',$value,2);
 484                         $s->iw_url=$url;
 485                         $s->iw_local=(int)$local;
 486                 }
 487                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 488                 return $s->iw_url;
 489         }
 490         /**
 491          * Determine whether the object refers to a page within
 492          * this project.
 493          *
 494          * @return bool TRUE if this is an in-project interwiki link
 495          *      or a wikilink, FALSE otherwise
 496          */
 497         public function isLocal() {
 498                 if ( $this->mInterwiki != '' ) {
 499                         # Make sure key is loaded into cache
 500                         $this->getInterwikiLink( $this->mInterwiki );
 501                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 502                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 503                 } else {
 504                         return true;
 505                 }
 506         }
 507
 508         /**
 509          * Determine whether the object refers to a page within
 510          * this project and is transcludable.
 511          *
 512          * @return bool TRUE if this is transcludable
 513          */
 514         public function isTrans() {
 515                 if ($this->mInterwiki == '')
 516                         return false;
 517                 # Make sure key is loaded into cache
 518                 $this->getInterwikiLink( $this->mInterwiki );
 519                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 520                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 521         }
 522
 523         /**
 524          * Escape a text fragment, say from a link, for a URL
 525          */
 526         static function escapeFragmentForURL( $fragment ) {
 527                 $fragment = str_replace( ' ', '_', $fragment );
 528                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 529                 $replaceArray = array(
 530                         '%3A' => ':',
 531                         '%' => '.'
 532                 );
 533                 return strtr( $fragment, $replaceArray );
 534         }
 535
 536 #----------------------------------------------------------------------------
 537 #       Other stuff
 538 #----------------------------------------------------------------------------
 539
 540         /** Simple accessors */
 541         /**
 542          * Get the text form (spaces not underscores) of the main part
 543          * @return string
 544          */
 545         public function getText() { return $this->mTextform; }
 546         /**
 547          * Get the URL-encoded form of the main part
 548          * @return string
 549          */
 550         public function getPartialURL() { return $this->mUrlform; }
 551         /**
 552          * Get the main part with underscores
 553          * @return string
 554          */
 555         public function getDBkey() { return $this->mDbkeyform; }
 556         /**
 557          * Get the namespace index, i.e. one of the NS_xxxx constants
 558          * @return int
 559          */
 560         public function getNamespace() { return $this->mNamespace; }
 561         /**
 562          * Get the namespace text
 563          * @return string
 564          */
 565         public function getNsText() {
 566                 global $wgContLang, $wgCanonicalNamespaceNames;
 567
 568                 if ( '' != $this->mInterwiki ) {
 569                         // This probably shouldn't even happen. ohh man, oh yuck.
 570                         // But for interwiki transclusion it sometimes does.
 571                         // Shit. Shit shit shit.
 572                         //
 573                         // Use the canonical namespaces if possible to try to
 574                         // resolve a foreign namespace.
 575                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 576                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 577                         }
 578                 }
 579                 return $wgContLang->getNsText( $this->mNamespace );
 580         }
 581         /**
 582          * Get the DB key with the initial letter case as specified by the user
 583          */
 584         function getUserCaseDBKey() {
 585                 return $this->mUserCaseDBKey;
 586         }
 587         /**
 588          * Get the namespace text of the subject (rather than talk) page
 589          * @return string
 590          */
 591         public function getSubjectNsText() {
 592                 global $wgContLang;
 593                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 594         }
 595
 596         /**
 597          * Get the namespace text of the talk page
 598          * @return string
 599          */
 600         public function getTalkNsText() {
 601                 global $wgContLang;
 602                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 603         }
 604
 605         /**
 606          * Could this title have a corresponding talk page?
 607          * @return bool
 608          */
 609         public function canTalk() {
 610                 return( MWNamespace::canTalk( $this->mNamespace ) );
 611         }
 612
 613         /**
 614          * Get the interwiki prefix (or null string)
 615          * @return string
 616          */
 617         public function getInterwiki() { return $this->mInterwiki; }
 618         /**
 619          * Get the Title fragment (i.e. the bit after the #) in text form
 620          * @return string
 621          */
 622         public function getFragment() { return $this->mFragment; }
 623         /**
 624          * Get the fragment in URL form, including the "#" character if there is one
 625          * @return string
 626          */
 627         public function getFragmentForURL() {
 628                 if ( $this->mFragment == '' ) {
 629                         return '';
 630                 } else {
 631                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 632                 }
 633         }
 634         /**
 635          * Get the default namespace index, for when there is no namespace
 636          * @return int
 637          */
 638         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 639
 640         /**
 641          * Get title for search index
 642          * @return string a stripped-down title string ready for the
 643          *      search index
 644          */
 645         public function getIndexTitle() {
 646                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 647         }
 648
 649         /**
 650          * Get the prefixed database key form
 651          * @return string the prefixed title, with underscores and
 652          *      any interwiki and namespace prefixes
 653          */
 654         public function getPrefixedDBkey() {
 655                 $s = $this->prefix( $this->mDbkeyform );
 656                 $s = str_replace( ' ', '_', $s );
 657                 return $s;
 658         }
 659
 660         /**
 661          * Get the prefixed title with spaces.
 662          * This is the form usually used for display
 663          * @return string the prefixed title, with spaces
 664          */
 665         public function getPrefixedText() {
 666                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 667                         $s = $this->prefix( $this->mTextform );
 668                         $s = str_replace( '_', ' ', $s );
 669                         $this->mPrefixedText = $s;
 670                 }
 671                 return $this->mPrefixedText;
 672         }
 673
 674         /**
 675          * Get the prefixed title with spaces, plus any fragment
 676          * (part beginning with '#')
 677          * @return string the prefixed title, with spaces and
 678          *      the fragment, including '#'
 679          */
 680         public function getFullText() {
 681                 $text = $this->getPrefixedText();
 682                 if( '' != $this->mFragment ) {
 683                         $text .= '#' . $this->mFragment;
 684                 }
 685                 return $text;
 686         }
 687
 688         /**
 689          * Get the base name, i.e. the leftmost parts before the /
 690          * @return string Base name
 691          */
 692         public function getBaseText() {
 693                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 694                         return $this->getText();
 695                 }
 696
 697                 $parts = explode( '/', $this->getText() );
 698                 # Don't discard the real title if there's no subpage involved
 699                 if( count( $parts ) > 1 )
 700                         unset( $parts[ count( $parts ) - 1 ] );
 701                 return implode( '/', $parts );
 702         }
 703
 704         /**
 705          * Get the lowest-level subpage name, i.e. the rightmost part after /
 706          * @return string Subpage name
 707          */
 708         public function getSubpageText() {
 709                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 710                         return( $this->mTextform );
 711                 }
 712                 $parts = explode( '/', $this->mTextform );
 713                 return( $parts[ count( $parts ) - 1 ] );
 714         }
 715
 716         /**
 717          * Get a URL-encoded form of the subpage text
 718          * @return string URL-encoded subpage name
 719          */
 720         public function getSubpageUrlForm() {
 721                 $text = $this->getSubpageText();
 722                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 723                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 724                 return( $text );
 725         }
 726
 727         /**
 728          * Get a URL-encoded title (not an actual URL) including interwiki
 729          * @return string the URL-encoded form
 730          */
 731         public function getPrefixedURL() {
 732                 $s = $this->prefix( $this->mDbkeyform );
 733                 $s = str_replace( ' ', '_', $s );
 734
 735                 $s = wfUrlencode ( $s ) ;
 736
 737                 # Cleaning up URL to make it look nice -- is this safe?
 738                 $s = str_replace( '%28', '(', $s );
 739                 $s = str_replace( '%29', ')', $s );
 740
 741                 return $s;
 742         }
 743
 744         /**
 745          * Get a real URL referring to this title, with interwiki link and
 746          * fragment
 747          *
 748          * @param array $query an optional query string, not used for interwiki
 749          *   links. Can be specified as an associative array as well, e.g.,
 750          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 751          * @param string $variant language variant of url (for sr, zh..)
 752          * @return string the URL
 753          */
 754         public function getFullURL( $query = '', $variant = false ) {
 755                 global $wgContLang, $wgServer, $wgRequest;
 756
 757                 if( is_array( $query ) ) {
 758                         $query = wfArrayToCGI( $query );
 759                 }
 760
 761                 if ( '' == $this->mInterwiki ) {
 762                         $url = $this->getLocalUrl( $query, $variant );
 763
 764                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 765                         // Correct fix would be to move the prepending elsewhere.
 766                         if ($wgRequest->getVal('action') != 'render') {
 767                                 $url = $wgServer . $url;
 768                         }
 769                 } else {
 770                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 771
 772                         $namespace = wfUrlencode( $this->getNsText() );
 773                         if ( '' != $namespace ) {
 774                                 # Can this actually happen? Interwikis shouldn't be parsed.
 775                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 776                                 $namespace .= ':';
 777                         }
 778                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 779                         $url = wfAppendQuery( $url, $query );
 780                 }
 781
 782                 # Finally, add the fragment.
 783                 $url .= $this->getFragmentForURL();
 784
 785                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 786                 return $url;
 787         }
 788
 789         /**
 790          * Get a URL with no fragment or server name.  If this page is generated
 791          * with action=render, $wgServer is prepended.
 792          * @param mixed $query an optional query string; if not specified,
 793          *       $wgArticlePath will be used.  Can be specified as an associative array
 794          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 795          *   URL-escaped).
 796          * @param string $variant language variant of url (for sr, zh..)
 797          * @return string the URL
 798          */
 799         public function getLocalURL( $query = '', $variant = false ) {
 800                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 801                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 802
 803                 if( is_array( $query ) ) {
 804                         $query = wfArrayToCGI( $query );
 805                 }
 806
 807                 // internal links should point to same variant as current page (only anonymous users)
 808                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 809                         $pref = $wgContLang->getPreferredVariant(false);
 810                         if($pref != $wgContLang->getCode())
 811                                 $variant = $pref;
 812                 }
 813
 814                 if ( $this->isExternal() ) {
 815                         $url = $this->getFullURL();
 816                         if ( $query ) {
 817                                 // This is currently only used for edit section links in the
 818                                 // context of interwiki transclusion. In theory we should
 819                                 // append the query to the end of any existing query string,
 820                                 // but interwiki transclusion is already broken in that case.
 821                                 $url .= "?$query";
 822                         }
 823                 } else {
 824                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 825                         if ( $query == '' ) {
 826                                 if( $variant != false && $wgContLang->hasVariants() ) {
 827                                         if( $wgVariantArticlePath == false ) {
 828                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 829                                         } else {
 830                                                 $variantArticlePath = $wgVariantArticlePath;
 831                                         }
 832                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 833                                         $url = str_replace( '$1', $dbkey, $url  );
 834                                 } else {
 835                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 836                                 }
 837                         } else {
 838                                 global $wgActionPaths;
 839                                 $url = false;
 840                                 $matches = array();
 841                                 if( !empty( $wgActionPaths ) &&
 842                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 843                                 {
 844                                         $action = urldecode( $matches[2] );
 845                                         if( isset( $wgActionPaths[$action] ) ) {
 846                                                 $query = $matches[1];
 847                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 848                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 849                                                 if( $query != '' ) $url .= '?' . $query;
 850                                         }
 851                                 }
 852                                 if ( $url === false ) {
 853                                         if ( $query == '-' ) {
 854                                                 $query = '';
 855                                         }
 856                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 857                                 }
 858                         }
 859
 860                         // FIXME: this causes breakage in various places when we
 861                         // actually expected a local URL and end up with dupe prefixes.
 862                         if ($wgRequest->getVal('action') == 'render') {
 863                                 $url = $wgServer . $url;
 864                         }
 865                 }
 866                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 867                 return $url;
 868         }
 869
 870         /**
 871          * Get an HTML-escaped version of the URL form, suitable for
 872          * using in a link, without a server name or fragment
 873          * @param string $query an optional query string
 874          * @return string the URL
 875          */
 876         public function escapeLocalURL( $query = '' ) {
 877                 return htmlspecialchars( $this->getLocalURL( $query ) );
 878         }
 879
 880         /**
 881          * Get an HTML-escaped version of the URL form, suitable for
 882          * using in a link, including the server name and fragment
 883          *
 884          * @return string the URL
 885          * @param string $query an optional query string
 886          */
 887         public function escapeFullURL( $query = '' ) {
 888                 return htmlspecialchars( $this->getFullURL( $query ) );
 889         }
 890
 891         /**
 892          * Get the URL form for an internal link.
 893          * - Used in various Squid-related code, in case we have a different
 894          * internal hostname for the server from the exposed one.
 895          *
 896          * @param string $query an optional query string
 897          * @param string $variant language variant of url (for sr, zh..)
 898          * @return string the URL
 899          */
 900         public function getInternalURL( $query = '', $variant = false ) {
 901                 global $wgInternalServer;
 902                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 903                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 904                 return $url;
 905         }
 906
 907         /**
 908          * Get the edit URL for this Title
 909          * @return string the URL, or a null string if this is an
 910          *      interwiki link
 911          */
 912         public function getEditURL() {
 913                 if ( '' != $this->mInterwiki ) { return ''; }
 914                 $s = $this->getLocalURL( 'action=edit' );
 915
 916                 return $s;
 917         }
 918
 919         /**
 920          * Get the HTML-escaped displayable text form.
 921          * Used for the title field in <a> tags.
 922          * @return string the text, including any prefixes
 923          */
 924         public function getEscapedText() {
 925                 return htmlspecialchars( $this->getPrefixedText() );
 926         }
 927
 928         /**
 929          * Is this Title interwiki?
 930          * @return boolean
 931          */
 932         public function isExternal() { return ( '' != $this->mInterwiki ); }
 933
 934         /**
 935          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 936          *
 937          * @param string Action to check (default: edit)
 938          * @return bool
 939          */
 940         public function isSemiProtected( $action = 'edit' ) {
 941                 if( $this->exists() ) {
 942                         $restrictions = $this->getRestrictions( $action );
 943                         if( count( $restrictions ) > 0 ) {
 944                                 foreach( $restrictions as $restriction ) {
 945                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 946                                                 return false;
 947                                 }
 948                         } else {
 949                                 # Not protected
 950                                 return false;
 951                         }
 952                         return true;
 953                 } else {
 954                         # If it doesn't exist, it can't be protected
 955                         return false;
 956                 }
 957         }
 958
 959         /**
 960          * Does the title correspond to a protected article?
 961          * @param string $what the action the page is protected from,
 962          * by default checks move and edit
 963          * @return boolean
 964          */
 965         public function isProtected( $action = '' ) {
 966                 global $wgRestrictionLevels, $wgRestrictionTypes;
 967
 968                 # Special pages have inherent protection
 969                 if( $this->getNamespace() == NS_SPECIAL )
 970                         return true;
 971
 972                 # Check regular protection levels
 973                 foreach( $wgRestrictionTypes as $type ){
 974                         if( $action == $type || $action == '' ) {
 975                                 $r = $this->getRestrictions( $type );
 976                                 foreach( $wgRestrictionLevels as $level ) {
 977                                         if( in_array( $level, $r ) && $level != '' ) {
 978                                                 return true;
 979                                         }
 980                                 }
 981                         }
 982                 }
 983
 984                 return false;
 985         }
 986
 987         /**
 988          * Is $wgUser watching this page?
 989          * @return boolean
 990          */
 991         public function userIsWatching() {
 992                 global $wgUser;
 993
 994                 if ( is_null( $this->mWatched ) ) {
 995                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 996                                 $this->mWatched = false;
 997                         } else {
 998                                 $this->mWatched = $wgUser->isWatched( $this );
 999                         }
1000                 }
1001                 return $this->mWatched;
1002         }
1003
1004         /**
1005          * Can $wgUser perform $action on this page?
1006          * This skips potentially expensive cascading permission checks.
1007          *
1008          * Suitable for use for nonessential UI controls in common cases, but
1009          * _not_ for functional access control.
1010          *
1011          * May provide false positives, but should never provide a false negative.
1012          *
1013          * @param string $action action that permission needs to be checked for
1014          * @return boolean
1015          */
1016         public function quickUserCan( $action ) {
1017                 return $this->userCan( $action, false );
1018         }
1019
1020         /**
1021          * Determines if $wgUser is unable to edit this page because it has been protected
1022          * by $wgNamespaceProtection.
1023          *
1024          * @return boolean
1025          */
1026         public function isNamespaceProtected() {
1027                 global $wgNamespaceProtection, $wgUser;
1028                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1029                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1030                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1031                                         return true;
1032                         }
1033                 }
1034                 return false;
1035         }
1036
1037         /**
1038          * Can $wgUser perform $action on this page?
1039          * @param string $action action that permission needs to be checked for
1040          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1041          * @return boolean
1042          */
1043         public function userCan( $action, $doExpensiveQueries = true ) {
1044                 global $wgUser;
1045                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1046         }
1047
1048         /**
1049          * Can $user perform $action on this page?
1050          *
1051          * FIXME: This *does not* check throttles (User::pingLimiter()).
1052          *
1053          * @param string $action action that permission needs to be checked for
1054          * @param User $user user to check
1055          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1056          * @param array $ignoreErrors Set this to a list of message keys whose corresponding errors may be ignored.
1057          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1058          */
1059         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1060                 if( !StubObject::isRealObject( $user ) ) {
1061                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1062                         global $wgUser;
1063                         $wgUser->_unstub( '', 5 );
1064                         $user = $wgUser;
1065                 }
1066                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1067
1068                 global $wgContLang;
1069                 global $wgLang;
1070                 global $wgEmailConfirmToEdit;
1071
1072                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1073                         $errors[] = array( 'confirmedittext' );
1074                 }
1075
1076                 if ( $user->isBlockedFrom( $this ) && $action != 'createaccount' ) {
1077                         $block = $user->mBlock;
1078
1079                         // This is from OutputPage::blockedPage
1080                         // Copied at r23888 by werdna
1081
1082                         $id = $user->blockedBy();
1083                         $reason = $user->blockedFor();
1084                         if( $reason == '' ) {
1085                                 $reason = wfMsg( 'blockednoreason' );
1086                         }
1087                         $ip = wfGetIP();
1088
1089                         if ( is_numeric( $id ) ) {
1090                                 $name = User::whoIs( $id );
1091                         } else {
1092                                 $name = $id;
1093                         }
1094
1095                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1096                         $blockid = $block->mId;
1097                         $blockExpiry = $user->mBlock->mExpiry;
1098                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1099
1100                         if ( $blockExpiry == 'infinity' ) {
1101                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1102                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1103
1104                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1105                                         if ( strpos( $option, ':' ) == false )
1106                                                 continue;
1107
1108                                         list ($show, $value) = explode( ":", $option );
1109
1110                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1111                                                 $blockExpiry = $show;
1112                                                 break;
1113                                         }
1114                                 }
1115                         } else {
1116                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1117                         }
1118
1119                         $intended = $user->mBlock->mAddress;
1120
1121                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1122                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1123                 }
1124
1125                 // Remove the errors being ignored.
1126
1127                 foreach( $errors as $index => $error ) {
1128                         $error_key = is_array($error) ? $error[0] : $error;
1129
1130                         if (in_array( $error_key, $ignoreErrors )) {
1131                                 unset($errors[$index]);
1132                         }
1133                 }
1134
1135                 return $errors;
1136         }
1137
1138         /**
1139          * Can $user perform $action on this page? This is an internal function,
1140          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1141          * checks on wfReadOnly() and blocks)
1142          *
1143          * @param string $action action that permission needs to be checked for
1144          * @param User $user user to check
1145          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1146          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1147          */
1148         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1149                 wfProfileIn( __METHOD__ );
1150
1151                 $errors = array();
1152
1153                 // Use getUserPermissionsErrors instead
1154                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1155                         wfProfileOut( __METHOD__ );
1156                         return $result ? array() : array( array( 'badaccess-group0' ) );
1157                 }
1158
1159                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1160                         if ($result != array() && is_array($result) && !is_array($result[0]))
1161                                 $errors[] = $result; # A single array representing an error
1162                         else if (is_array($result) && is_array($result[0]))
1163                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1164                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1165                                 $errors[] = array($result); # A string representing a message-id
1166                         else if ($result === false )
1167                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1168                 }
1169                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1170                         if ($result != array() && is_array($result) && !is_array($result[0]))
1171                                 $errors[] = $result; # A single array representing an error
1172                         else if (is_array($result) && is_array($result[0]))
1173                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1174                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1175                                 $errors[] = array($result); # A string representing a message-id
1176                         else if ($result === false )
1177                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1178                 }
1179
1180                 $specialOKActions = array( 'createaccount', 'execute' );
1181                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1182                         $errors[] = array('ns-specialprotected');
1183                 }
1184
1185                 if ( $this->isNamespaceProtected() ) {
1186                         $ns = $this->getNamespace() == NS_MAIN
1187                                 ? wfMsg( 'nstab-main' )
1188                                 : $this->getNsText();
1189                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1190                                 ? array('protectedinterface')
1191                                 : array( 'namespaceprotected',  $ns ) );
1192                 }
1193
1194                 if( $this->mDbkeyform == '_' ) {
1195                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1196                         $errors[] = array('badaccess-group0');
1197                 }
1198
1199                 # protect css/js subpages of user pages
1200                 # XXX: this might be better using restrictions
1201                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1202                 if( $this->isCssJsSubpage()
1203                         && !$user->isAllowed('editusercssjs')
1204                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1205                         $errors[] = array('customcssjsprotected');
1206                 }
1207
1208                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1209                         # We /could/ use the protection level on the source page, but it's fairly ugly
1210                         #  as we have to establish a precedence hierarchy for pages included by multiple
1211                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1212                         #  as they could remove the protection anyway.
1213                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1214                         # Cascading protection depends on more than this page...
1215                         # Several cascading protected pages may include this page...
1216                         # Check each cascading level
1217                         # This is only for protection restrictions, not for all actions
1218                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1219                                 foreach( $restrictions[$action] as $right ) {
1220                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1221                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1222                                                 $pages = '';
1223                                                 foreach( $cascadingSources as $page )
1224                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1225                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1226                                         }
1227                                 }
1228                         }
1229                 }
1230
1231                 foreach( $this->getRestrictions($action) as $right ) {
1232                         // Backwards compatibility, rewrite sysop -> protect
1233                         if ( $right == 'sysop' ) {
1234                                 $right = 'protect';
1235                         }
1236                         if( '' != $right && !$user->isAllowed( $right ) ) {
1237                                 //Users with 'editprotected' permission can edit protected pages
1238                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1239                                         //Users with 'editprotected' permission cannot edit protected pages
1240                                         //with cascading option turned on.
1241                                         if($this->mCascadeRestriction) {
1242                                                 $errors[] = array( 'protectedpagetext', $right );
1243                                         } else {
1244                                                 //Nothing, user can edit!
1245                                         }
1246                                 } else {
1247                                         $errors[] = array( 'protectedpagetext', $right );
1248                                 }
1249                         }
1250                 }
1251
1252                 if ($action == 'protect') {
1253                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1254                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1255                         }
1256                 }
1257
1258                 if ($action == 'create') {
1259                         $title_protection = $this->getTitleProtection();
1260
1261                         if (is_array($title_protection)) {
1262                                 extract($title_protection);
1263
1264                                 if ($pt_create_perm == 'sysop')
1265                                         $pt_create_perm = 'protect';
1266
1267                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1268                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1269                                 }
1270                         }
1271
1272                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1273                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1274                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1275                         }
1276                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1277                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1278                 } elseif ( !$user->isAllowed( $action ) ) {
1279                         $return = null;
1280                         $groups = array();
1281                         global $wgGroupPermissions;
1282                         foreach( $wgGroupPermissions as $key => $value ) {
1283                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1284                                         $groupName = User::getGroupName( $key );
1285                                         $groupPage = User::getGroupPage( $key );
1286                                         if( $groupPage ) {
1287                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1288                                         } else {
1289                                                 $groups[] = $groupName;
1290                                         }
1291                                 }
1292                         }
1293                         $n = count( $groups );
1294                         $groups = implode( ', ', $groups );
1295                         switch( $n ) {
1296                                 case 0:
1297                                 case 1:
1298                                 case 2:
1299                                         $return = array( "badaccess-group$n", $groups );
1300                                         break;
1301                                 default:
1302                                         $return = array( 'badaccess-groups', $groups );
1303                         }
1304                         $errors[] = $return;
1305                 }
1306
1307                 wfProfileOut( __METHOD__ );
1308                 return $errors;
1309         }
1310
1311         /**
1312          * Is this title subject to title protection?
1313          * @return mixed An associative array representing any existent title
1314          *   protection, or false if there's none.
1315          */
1316         private function getTitleProtection() {
1317                 // Can't protect pages in special namespaces
1318                 if ( $this->getNamespace() < 0 ) {
1319                         return false;
1320                 }
1321
1322                 $dbr = wfGetDB( DB_SLAVE );
1323                 $res = $dbr->select( 'protected_titles', '*',
1324                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1325
1326                 if ($row = $dbr->fetchRow( $res )) {
1327                         return $row;
1328                 } else {
1329                         return false;
1330                 }
1331         }
1332
1333         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1334                 global $wgGroupPermissions,$wgUser,$wgContLang;
1335
1336                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1337                         && $expiry == $this->mRestrictionsExpiry) {
1338                         // No change
1339                         return true;
1340                 }
1341
1342                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1343
1344                 $dbw = wfGetDB( DB_MASTER );
1345
1346                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1347
1348                 $expiry_description = '';
1349                 if ( $encodedExpiry != 'infinity' ) {
1350                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1351                 }
1352
1353                 # Update protection table
1354                 if ($create_perm != '' ) {
1355                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1356                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1357                                         , 'pt_create_perm' => $create_perm
1358                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1359                                         , 'pt_expiry' => $encodedExpiry
1360                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1361                 } else {
1362                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1363                                 'pt_title' => $title ), __METHOD__ );
1364                 }
1365                 # Update the protection log
1366                 $log = new LogPage( 'protect' );
1367
1368                 if( $create_perm ) {
1369                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1370                 } else {
1371                         $log->addEntry( 'unprotect', $this, $reason );
1372                 }
1373
1374                 return true;
1375         }
1376
1377         /**
1378          * Remove any title protection (due to page existing
1379          */
1380         public function deleteTitleProtection() {
1381                 $dbw = wfGetDB( DB_MASTER );
1382
1383                 $dbw->delete( 'protected_titles',
1384                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1385         }
1386
1387         /**
1388          * Can $wgUser edit this page?
1389          * @return boolean
1390          * @deprecated use userCan('edit')
1391          */
1392         public function userCanEdit( $doExpensiveQueries = true ) {
1393                 return $this->userCan( 'edit', $doExpensiveQueries );
1394         }
1395
1396         /**
1397          * Can $wgUser create this page?
1398          * @return boolean
1399          * @deprecated use userCan('create')
1400          */
1401         public function userCanCreate( $doExpensiveQueries = true ) {
1402                 return $this->userCan( 'create', $doExpensiveQueries );
1403         }
1404
1405         /**
1406          * Can $wgUser move this page?
1407          * @return boolean
1408          * @deprecated use userCan('move')
1409          */
1410         public function userCanMove( $doExpensiveQueries = true ) {
1411                 return $this->userCan( 'move', $doExpensiveQueries );
1412         }
1413
1414         /**
1415          * Would anybody with sufficient privileges be able to move this page?
1416          * Some pages just aren't movable.
1417          *
1418          * @return boolean
1419          */
1420         public function isMovable() {
1421                 return MWNamespace::isMovable( $this->getNamespace() )
1422                         && $this->getInterwiki() == '';
1423         }
1424
1425         /**
1426          * Can $wgUser read this page?
1427          * @return boolean
1428          * @todo fold these checks into userCan()
1429          */
1430         public function userCanRead() {
1431                 global $wgUser, $wgGroupPermissions;
1432
1433                 $result = null;
1434                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1435                 if ( $result !== null ) {
1436                         return $result;
1437                 }
1438
1439                 # Shortcut for public wikis, allows skipping quite a bit of code
1440                 if ($wgGroupPermissions['*']['read'])
1441                         return true;
1442
1443                 if( $wgUser->isAllowed( 'read' ) ) {
1444                         return true;
1445                 } else {
1446                         global $wgWhitelistRead;
1447
1448                         /**
1449                          * Always grant access to the login page.
1450                          * Even anons need to be able to log in.
1451                         */
1452                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1453                                 return true;
1454                         }
1455
1456                         /**
1457                          * Bail out if there isn't whitelist
1458                          */
1459                         if( !is_array($wgWhitelistRead) ) {
1460                                 return false;
1461                         }
1462
1463                         /**
1464                          * Check for explicit whitelisting
1465                          */
1466                         $name = $this->getPrefixedText();
1467                         $dbName = $this->getPrefixedDBKey();
1468                         // Check with and without underscores
1469                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1470                                 return true;
1471
1472                         /**
1473                          * Old settings might have the title prefixed with
1474                          * a colon for main-namespace pages
1475                          */
1476                         if( $this->getNamespace() == NS_MAIN ) {
1477                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1478                                         return true;
1479                         }
1480
1481                         /**
1482                          * If it's a special page, ditch the subpage bit
1483                          * and check again
1484                          */
1485                         if( $this->getNamespace() == NS_SPECIAL ) {
1486                                 $name = $this->getDBkey();
1487                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1488                                 if ( $name === false ) {
1489                                         # Invalid special page, but we show standard login required message
1490                                         return false;
1491                                 }
1492
1493                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1494                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1495                                         return true;
1496                         }
1497
1498                 }
1499                 return false;
1500         }
1501
1502         /**
1503          * Is this a talk page of some sort?
1504          * @return bool
1505          */
1506         public function isTalkPage() {
1507                 return MWNamespace::isTalk( $this->getNamespace() );
1508         }
1509
1510         /**
1511          * Is this a subpage?
1512          * @return bool
1513          */
1514         public function isSubpage() {
1515                 return MWNamespace::hasSubpages( $this->mNamespace )
1516                         ? strpos( $this->getText(), '/' ) !== false
1517                         : false;
1518         }
1519
1520         /**
1521          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1522          * @return bool
1523          */
1524         public function hasSubpages() {
1525                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1526                         # Duh
1527                         return false;
1528                 }
1529
1530                 # We dynamically add a member variable for the purpose of this method
1531                 # alone to cache the result.  There's no point in having it hanging
1532                 # around uninitialized in every Title object; therefore we only add it
1533                 # if needed and don't declare it statically.
1534                 if( isset( $this->mHasSubpages ) ) {
1535                         return $this->mHasSubpages;
1536                 }
1537
1538                 $db = wfGetDB( DB_SLAVE );
1539                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1540                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1541                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1542                         __METHOD__
1543                 );
1544         }
1545
1546         /**
1547          * Could this page contain custom CSS or JavaScript, based
1548          * on the title?
1549          *
1550          * @return bool
1551          */
1552         public function isCssOrJsPage() {
1553                 return $this->mNamespace == NS_MEDIAWIKI
1554                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1555         }
1556
1557         /**
1558          * Is this a .css or .js subpage of a user page?
1559          * @return bool
1560          */
1561         public function isCssJsSubpage() {
1562                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1563         }
1564         /**
1565          * Is this a *valid* .css or .js subpage of a user page?
1566          * Check that the corresponding skin exists
1567          */
1568         public function isValidCssJsSubpage() {
1569                 if ( $this->isCssJsSubpage() ) {
1570                         $skinNames = Skin::getSkinNames();
1571                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1572                 } else {
1573                         return false;
1574                 }
1575         }
1576         /**
1577          * Trim down a .css or .js subpage title to get the corresponding skin name
1578          */
1579         public function getSkinFromCssJsSubpage() {
1580                 $subpage = explode( '/', $this->mTextform );
1581                 $subpage = $subpage[ count( $subpage ) - 1 ];
1582                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1583         }
1584         /**
1585          * Is this a .css subpage of a user page?
1586          * @return bool
1587          */
1588         public function isCssSubpage() {
1589                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1590         }
1591         /**
1592          * Is this a .js subpage of a user page?
1593          * @return bool
1594          */
1595         public function isJsSubpage() {
1596                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1597         }
1598         /**
1599          * Protect css/js subpages of user pages: can $wgUser edit
1600          * this page?
1601          *
1602          * @return boolean
1603          * @todo XXX: this might be better using restrictions
1604          */
1605         public function userCanEditCssJsSubpage() {
1606                 global $wgUser;
1607                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1608         }
1609
1610         /**
1611          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1612          *
1613          * @return bool If the page is subject to cascading restrictions.
1614          */
1615         public function isCascadeProtected() {
1616                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1617                 return ( $sources > 0 );
1618         }
1619
1620         /**
1621          * Cascading protection: Get the source of any cascading restrictions on this page.
1622          *
1623          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1624          * @return array( mixed title array, restriction array)
1625          * 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.
1626          * The restriction array is an array of each type, each of which contains an array of unique groups
1627          */
1628         public function getCascadeProtectionSources( $get_pages = true ) {
1629                 global $wgRestrictionTypes;
1630
1631                 # Define our dimension of restrictions types
1632                 $pagerestrictions = array();
1633                 foreach( $wgRestrictionTypes as $action )
1634                         $pagerestrictions[$action] = array();
1635
1636                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1637                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1638                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1639                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1640                 }
1641
1642                 wfProfileIn( __METHOD__ );
1643
1644                 $dbr = wfGetDb( DB_SLAVE );
1645
1646                 if ( $this->getNamespace() == NS_IMAGE ) {
1647                         $tables = array ('imagelinks', 'page_restrictions');
1648                         $where_clauses = array(
1649                                 'il_to' => $this->getDBkey(),
1650                                 'il_from=pr_page',
1651                                 'pr_cascade' => 1 );
1652                 } else {
1653                         $tables = array ('templatelinks', 'page_restrictions');
1654                         $where_clauses = array(
1655                                 'tl_namespace' => $this->getNamespace(),
1656                                 'tl_title' => $this->getDBkey(),
1657                                 'tl_from=pr_page',
1658                                 'pr_cascade' => 1 );
1659                 }
1660
1661                 if ( $get_pages ) {
1662                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1663                         $where_clauses[] = 'page_id=pr_page';
1664                         $tables[] = 'page';
1665                 } else {
1666                         $cols = array( 'pr_expiry' );
1667                 }
1668
1669                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1670
1671                 $sources = $get_pages ? array() : false;
1672                 $now = wfTimestampNow();
1673                 $purgeExpired = false;
1674
1675                 foreach( $res as $row ) {
1676                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1677                         if( $expiry > $now ) {
1678                                 if ($get_pages) {
1679                                         $page_id = $row->pr_page;
1680                                         $page_ns = $row->page_namespace;
1681                                         $page_title = $row->page_title;
1682                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1683                                         # Add groups needed for each restriction type if its not already there
1684                                         # Make sure this restriction type still exists
1685                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1686                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1687                                         }
1688                                 } else {
1689                                         $sources = true;
1690                                 }
1691                         } else {
1692                                 // Trigger lazy purge of expired restrictions from the db
1693                                 $purgeExpired = true;
1694                         }
1695                 }
1696                 if( $purgeExpired ) {
1697                         Title::purgeExpiredRestrictions();
1698                 }
1699
1700                 wfProfileOut( __METHOD__ );
1701
1702                 if ( $get_pages ) {
1703                         $this->mCascadeSources = $sources;
1704                         $this->mCascadingRestrictions = $pagerestrictions;
1705                 } else {
1706                         $this->mHasCascadingRestrictions = $sources;
1707                 }
1708
1709                 return array( $sources, $pagerestrictions );
1710         }
1711
1712         function areRestrictionsCascading() {
1713                 if (!$this->mRestrictionsLoaded) {
1714                         $this->loadRestrictions();
1715                 }
1716
1717                 return $this->mCascadeRestriction;
1718         }
1719
1720         /**
1721          * Loads a string into mRestrictions array
1722          * @param resource $res restrictions as an SQL result.
1723          */
1724         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1725                 global $wgRestrictionTypes;
1726                 $dbr = wfGetDB( DB_SLAVE );
1727
1728                 foreach( $wgRestrictionTypes as $type ){
1729                         $this->mRestrictions[$type] = array();
1730                 }
1731
1732                 $this->mCascadeRestriction = false;
1733                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1734
1735                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1736
1737                 if ( $oldFashionedRestrictions === NULL ) {
1738                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1739                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1740                 }
1741
1742                 if ($oldFashionedRestrictions != '') {
1743
1744                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1745                                 $temp = explode( '=', trim( $restrict ) );
1746                                 if(count($temp) == 1) {
1747                                         // old old format should be treated as edit/move restriction
1748                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1749                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1750                                 } else {
1751                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1752                                 }
1753                         }
1754
1755                         $this->mOldRestrictions = true;
1756
1757                 }
1758
1759                 if( $dbr->numRows( $res ) ) {
1760                         # Current system - load second to make them override.
1761                         $now = wfTimestampNow();
1762                         $purgeExpired = false;
1763
1764                         foreach( $res as $row ) {
1765                                 # Cycle through all the restrictions.
1766
1767                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1768                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1769                                         continue;
1770
1771                                 // This code should be refactored, now that it's being used more generally,
1772                                 // But I don't really see any harm in leaving it in Block for now -werdna
1773                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1774
1775                                 // Only apply the restrictions if they haven't expired!
1776                                 if ( !$expiry || $expiry > $now ) {
1777                                         $this->mRestrictionsExpiry = $expiry;
1778                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1779
1780                                         $this->mCascadeRestriction |= $row->pr_cascade;
1781                                 } else {
1782                                         // Trigger a lazy purge of expired restrictions
1783                                         $purgeExpired = true;
1784                                 }
1785                         }
1786
1787                         if( $purgeExpired ) {
1788                                 Title::purgeExpiredRestrictions();
1789                         }
1790                 }
1791
1792                 $this->mRestrictionsLoaded = true;
1793         }
1794
1795         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1796                 if( !$this->mRestrictionsLoaded ) {
1797                         if ($this->exists()) {
1798                                 $dbr = wfGetDB( DB_SLAVE );
1799
1800                                 $res = $dbr->select( 'page_restrictions', '*',
1801                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1802
1803                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1804                         } else {
1805                                 $title_protection = $this->getTitleProtection();
1806
1807                                 if (is_array($title_protection)) {
1808                                         extract($title_protection);
1809
1810                                         $now = wfTimestampNow();
1811                                         $expiry = Block::decodeExpiry($pt_expiry);
1812
1813                                         if (!$expiry || $expiry > $now) {
1814                                                 // Apply the restrictions
1815                                                 $this->mRestrictionsExpiry = $expiry;
1816                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1817                                         } else { // Get rid of the old restrictions
1818                                                 Title::purgeExpiredRestrictions();
1819                                         }
1820                                 } else {
1821                                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1822                                 }
1823                                 $this->mRestrictionsLoaded = true;
1824                         }
1825                 }
1826         }
1827
1828         /**
1829          * Purge expired restrictions from the page_restrictions table
1830          */
1831         static function purgeExpiredRestrictions() {
1832                 $dbw = wfGetDB( DB_MASTER );
1833                 $dbw->delete( 'page_restrictions',
1834                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1835                         __METHOD__ );
1836
1837                 $dbw->delete( 'protected_titles',
1838                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1839                         __METHOD__ );
1840         }
1841
1842         /**
1843          * Accessor/initialisation for mRestrictions
1844          *
1845          * @param string $action action that permission needs to be checked for
1846          * @return array the array of groups allowed to edit this article
1847          */
1848         public function getRestrictions( $action ) {
1849                 if( !$this->mRestrictionsLoaded ) {
1850                         $this->loadRestrictions();
1851                 }
1852                 return isset( $this->mRestrictions[$action] )
1853                                 ? $this->mRestrictions[$action]
1854                                 : array();
1855         }
1856
1857         /**
1858          * Is there a version of this page in the deletion archive?
1859          * @return int the number of archived revisions
1860          */
1861         public function isDeleted() {
1862                 $fname = 'Title::isDeleted';
1863                 if ( $this->getNamespace() < 0 ) {
1864                         $n = 0;
1865                 } else {
1866                         $dbr = wfGetDB( DB_SLAVE );
1867                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1868                                 'ar_title' => $this->getDBkey() ), $fname );
1869                         if( $this->getNamespace() == NS_IMAGE ) {
1870                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1871                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1872                         }
1873                 }
1874                 return (int)$n;
1875         }
1876
1877         /**
1878          * Get the article ID for this Title from the link cache,
1879          * adding it if necessary
1880          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1881          *      for update
1882          * @return int the ID
1883          */
1884         public function getArticleID( $flags = 0 ) {
1885                 $linkCache = LinkCache::singleton();
1886                 if ( $flags & GAID_FOR_UPDATE ) {
1887                         $oldUpdate = $linkCache->forUpdate( true );
1888                         $this->mArticleID = $linkCache->addLinkObj( $this );
1889                         $linkCache->forUpdate( $oldUpdate );
1890                 } else {
1891                         if ( -1 == $this->mArticleID ) {
1892                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1893                         }
1894                 }
1895                 return $this->mArticleID;
1896         }
1897
1898         /**
1899          * Is this an article that is a redirect page?
1900          * Uses link cache, adding it if necessary
1901          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1902          * @return bool
1903          */
1904         public function isRedirect( $flags = 0 ) {
1905                 if( !is_null($this->mRedirect) )
1906                         return $this->mRedirect;
1907                 # Zero for special pages.
1908                 # Also, calling getArticleID() loads the field from cache!
1909                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1910                         return false;
1911                 }
1912                 $linkCache = LinkCache::singleton();
1913                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1914
1915                 return $this->mRedirect;
1916         }
1917
1918         /**
1919          * What is the length of this page?
1920          * Uses link cache, adding it if necessary
1921          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1922          * @return bool
1923          */
1924         public function getLength( $flags = 0 ) {
1925                 if( $this->mLength != -1 )
1926                         return $this->mLength;
1927                 # Zero for special pages.
1928                 # Also, calling getArticleID() loads the field from cache!
1929                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1930                         return 0;
1931                 }
1932                 $linkCache = LinkCache::singleton();
1933                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1934
1935                 return $this->mLength;
1936         }
1937
1938         /**
1939          * What is the page_latest field for this page?
1940          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1941          * @return int
1942          */
1943         public function getLatestRevID( $flags = 0 ) {
1944                 if ($this->mLatestID !== false)
1945                         return $this->mLatestID;
1946
1947                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1948                 return $this->mLatestID = $db->selectField( 'revision',
1949                         "max(rev_id)",
1950                         array('rev_page' => $this->getArticleID($flags)),
1951                         'Title::getLatestRevID' );
1952         }
1953
1954         /**
1955          * This clears some fields in this object, and clears any associated
1956          * keys in the "bad links" section of the link cache.
1957          *
1958          * - This is called from Article::insertNewArticle() to allow
1959          * loading of the new page_id. It's also called from
1960          * Article::doDeleteArticle()
1961          *
1962          * @param int $newid the new Article ID
1963          */
1964         public function resetArticleID( $newid ) {
1965                 $linkCache = LinkCache::singleton();
1966                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1967
1968                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1969                 else { $this->mArticleID = $newid; }
1970                 $this->mRestrictionsLoaded = false;
1971                 $this->mRestrictions = array();
1972         }
1973
1974         /**
1975          * Updates page_touched for this page; called from LinksUpdate.php
1976          * @return bool true if the update succeded
1977          */
1978         public function invalidateCache() {
1979                 global $wgUseFileCache;
1980
1981                 if ( wfReadOnly() ) {
1982                         return;
1983                 }
1984
1985                 $dbw = wfGetDB( DB_MASTER );
1986                 $success = $dbw->update( 'page',
1987                         array( /* SET */
1988                                 'page_touched' => $dbw->timestamp()
1989                         ), array( /* WHERE */
1990                                 'page_namespace' => $this->getNamespace() ,
1991                                 'page_title' => $this->getDBkey()
1992                         ), 'Title::invalidateCache'
1993                 );
1994
1995                 if ($wgUseFileCache) {
1996                         $cache = new HTMLFileCache($this);
1997                         @unlink($cache->fileCacheName());
1998                 }
1999
2000                 return $success;
2001         }
2002
2003         /**
2004          * Prefix some arbitrary text with the namespace or interwiki prefix
2005          * of this object
2006          *
2007          * @param string $name the text
2008          * @return string the prefixed text
2009          * @private
2010          */
2011         /* private */ function prefix( $name ) {
2012                 $p = '';
2013                 if ( '' != $this->mInterwiki ) {
2014                         $p = $this->mInterwiki . ':';
2015                 }
2016                 if ( 0 != $this->mNamespace ) {
2017                         $p .= $this->getNsText() . ':';
2018                 }
2019                 return $p . $name;
2020         }
2021
2022         /**
2023          * Secure and split - main initialisation function for this object
2024          *
2025          * Assumes that mDbkeyform has been set, and is urldecoded
2026          * and uses underscores, but not otherwise munged.  This function
2027          * removes illegal characters, splits off the interwiki and
2028          * namespace prefixes, sets the other forms, and canonicalizes
2029          * everything.
2030          * @return bool true on success
2031          */
2032         private function secureAndSplit() {
2033                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2034
2035                 # Initialisation
2036                 static $rxTc = false;
2037                 if( !$rxTc ) {
2038                         # Matching titles will be held as illegal.
2039                         $rxTc = '/' .
2040                                 # Any character not allowed is forbidden...
2041                                 '[^' . Title::legalChars() . ']' .
2042                                 # URL percent encoding sequences interfere with the ability
2043                                 # to round-trip titles -- you can't link to them consistently.
2044                                 '|%[0-9A-Fa-f]{2}' .
2045                                 # XML/HTML character references produce similar issues.
2046                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2047                                 '|&#[0-9]+;' .
2048                                 '|&#x[0-9A-Fa-f]+;' .
2049                                 '/S';
2050                 }
2051
2052                 $this->mInterwiki = $this->mFragment = '';
2053                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2054
2055                 $dbkey = $this->mDbkeyform;
2056
2057                 # Strip Unicode bidi override characters.
2058                 # Sometimes they slip into cut-n-pasted page titles, where the
2059                 # override chars get included in list displays.
2060                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
2061                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
2062
2063                 # Clean up whitespace
2064                 #
2065                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2066                 $dbkey = trim( $dbkey, '_' );
2067
2068                 if ( '' == $dbkey ) {
2069                         return false;
2070                 }
2071
2072                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2073                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2074                         return false;
2075                 }
2076
2077                 $this->mDbkeyform = $dbkey;
2078
2079                 # Initial colon indicates main namespace rather than specified default
2080                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2081                 if ( ':' == $dbkey{0} ) {
2082                         $this->mNamespace = NS_MAIN;
2083                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2084                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2085                 }
2086
2087                 # Namespace or interwiki prefix
2088                 $firstPass = true;
2089                 do {
2090                         $m = array();
2091                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
2092                                 $p = $m[1];
2093                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
2094                                         # Ordinary namespace
2095                                         $dbkey = $m[2];
2096                                         $this->mNamespace = $ns;
2097                                 } elseif( $this->getInterwikiLink( $p ) ) {
2098                                         if( !$firstPass ) {
2099                                                 # Can't make a local interwiki link to an interwiki link.
2100                                                 # That's just crazy!
2101                                                 return false;
2102                                         }
2103
2104                                         # Interwiki link
2105                                         $dbkey = $m[2];
2106                                         $this->mInterwiki = $wgContLang->lc( $p );
2107
2108                                         # Redundant interwiki prefix to the local wiki
2109                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2110                                                 if( $dbkey == '' ) {
2111                                                         # Can't have an empty self-link
2112                                                         return false;
2113                                                 }
2114                                                 $this->mInterwiki = '';
2115                                                 $firstPass = false;
2116                                                 # Do another namespace split...
2117                                                 continue;
2118                                         }
2119
2120                                         # If there's an initial colon after the interwiki, that also
2121                                         # resets the default namespace
2122                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2123                                                 $this->mNamespace = NS_MAIN;
2124                                                 $dbkey = substr( $dbkey, 1 );
2125                                         }
2126                                 }
2127                                 # If there's no recognized interwiki or namespace,
2128                                 # then let the colon expression be part of the title.
2129                         }
2130                         break;
2131                 } while( true );
2132
2133                 # We already know that some pages won't be in the database!
2134                 #
2135                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2136                         $this->mArticleID = 0;
2137                 }
2138                 $fragment = strstr( $dbkey, '#' );
2139                 if ( false !== $fragment ) {
2140                         $this->setFragment( $fragment );
2141                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2142                         # remove whitespace again: prevents "Foo_bar_#"
2143                         # becoming "Foo_bar_"
2144                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2145                 }
2146
2147                 # Reject illegal characters.
2148                 #
2149                 if( preg_match( $rxTc, $dbkey ) ) {
2150                         return false;
2151                 }
2152
2153                 /**
2154                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2155                  * reachable due to the way web browsers deal with 'relative' URLs.
2156                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2157                  */
2158                 if ( strpos( $dbkey, '.' ) !== false &&
2159                      ( $dbkey === '.' || $dbkey === '..' ||
2160                        strpos( $dbkey, './' ) === 0  ||
2161                        strpos( $dbkey, '../' ) === 0 ||
2162                        strpos( $dbkey, '/./' ) !== false ||
2163                        strpos( $dbkey, '/../' ) !== false  ||
2164                        substr( $dbkey, -2 ) == '/.' ||
2165                        substr( $dbkey, -3 ) == '/..' ) )
2166                 {
2167                         return false;
2168                 }
2169
2170                 /**
2171                  * Magic tilde sequences? Nu-uh!
2172                  */
2173                 if( strpos( $dbkey, '~~~' ) !== false ) {
2174                         return false;
2175                 }
2176
2177                 /**
2178                  * Limit the size of titles to 255 bytes.
2179                  * This is typically the size of the underlying database field.
2180                  * We make an exception for special pages, which don't need to be stored
2181                  * in the database, and may edge over 255 bytes due to subpage syntax
2182                  * for long titles, e.g. [[Special:Block/Long name]]
2183                  */
2184                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2185                   strlen( $dbkey ) > 512 )
2186                 {
2187                         return false;
2188                 }
2189
2190                 /**
2191                  * Normally, all wiki links are forced to have
2192                  * an initial capital letter so [[foo]] and [[Foo]]
2193                  * point to the same place.
2194                  *
2195                  * Don't force it for interwikis, since the other
2196                  * site might be case-sensitive.
2197                  */
2198                 $this->mUserCaseDBKey = $dbkey;
2199                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2200                         $dbkey = $wgContLang->ucfirst( $dbkey );
2201                 }
2202
2203                 /**
2204                  * Can't make a link to a namespace alone...
2205                  * "empty" local links can only be self-links
2206                  * with a fragment identifier.
2207                  */
2208                 if( $dbkey == '' &&
2209                         $this->mInterwiki == '' &&
2210                         $this->mNamespace != NS_MAIN ) {
2211                         return false;
2212                 }
2213                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2214                 // IP names are not allowed for accounts, and can only be referring to
2215                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2216                 // there are numerous ways to present the same IP. Having sp:contribs scan
2217                 // them all is silly and having some show the edits and others not is
2218                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2219                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2220                         IP::sanitizeIP( $dbkey ) : $dbkey;
2221                 // Any remaining initial :s are illegal.
2222                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2223                         return false;
2224                 }
2225
2226                 # Fill fields
2227                 $this->mDbkeyform = $dbkey;
2228                 $this->mUrlform = wfUrlencode( $dbkey );
2229
2230                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2231
2232                 return true;
2233         }
2234
2235         /**
2236          * Set the fragment for this title
2237          * This is kind of bad, since except for this rarely-used function, Title objects
2238          * are immutable. The reason this is here is because it's better than setting the
2239          * members directly, which is what Linker::formatComment was doing previously.
2240          *
2241          * @param string $fragment text
2242          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2243          */
2244         public function setFragment( $fragment ) {
2245                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2246         }
2247
2248         /**
2249          * Get a Title object associated with the talk page of this article
2250          * @return Title the object for the talk page
2251          */
2252         public function getTalkPage() {
2253                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2254         }
2255
2256         /**
2257          * Get a title object associated with the subject page of this
2258          * talk page
2259          *
2260          * @return Title the object for the subject page
2261          */
2262         public function getSubjectPage() {
2263                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2264         }
2265
2266         /**
2267          * Get an array of Title objects linking to this Title
2268          * Also stores the IDs in the link cache.
2269          *
2270          * WARNING: do not use this function on arbitrary user-supplied titles!
2271          * On heavily-used templates it will max out the memory.
2272          *
2273          * @param string $options may be FOR UPDATE
2274          * @return array the Title objects linking here
2275          */
2276         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2277                 $linkCache = LinkCache::singleton();
2278
2279                 if ( $options ) {
2280                         $db = wfGetDB( DB_MASTER );
2281                 } else {
2282                         $db = wfGetDB( DB_SLAVE );
2283                 }
2284
2285                 $res = $db->select( array( 'page', $table ),
2286                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2287                         array(
2288                                 "{$prefix}_from=page_id",
2289                                 "{$prefix}_namespace" => $this->getNamespace(),
2290                                 "{$prefix}_title"     => $this->getDBkey() ),
2291                         __METHOD__,
2292                         $options );
2293
2294                 $retVal = array();
2295                 if ( $db->numRows( $res ) ) {
2296                         foreach( $res as $row ) {
2297                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2298                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2299                                         $retVal[] = $titleObj;
2300                                 }
2301                         }
2302                 }
2303                 $db->freeResult( $res );
2304                 return $retVal;
2305         }
2306
2307         /**
2308          * Get an array of Title objects using this Title as a template
2309          * Also stores the IDs in the link cache.
2310          *
2311          * WARNING: do not use this function on arbitrary user-supplied titles!
2312          * On heavily-used templates it will max out the memory.
2313          *
2314          * @param string $options may be FOR UPDATE
2315          * @return array the Title objects linking here
2316          */
2317         public function getTemplateLinksTo( $options = '' ) {
2318                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2319         }
2320
2321         /**
2322          * Get an array of Title objects referring to non-existent articles linked from this page
2323          *
2324          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2325          * @param string $options may be FOR UPDATE
2326          * @return array the Title objects
2327          */
2328         public function getBrokenLinksFrom( $options = '' ) {
2329                 if ( $this->getArticleId() == 0 ) {
2330                         # All links from article ID 0 are false positives
2331                         return array();
2332                 }
2333
2334                 if ( $options ) {
2335                         $db = wfGetDB( DB_MASTER );
2336                 } else {
2337                         $db = wfGetDB( DB_SLAVE );
2338                 }
2339
2340                 $res = $db->safeQuery(
2341                           "SELECT pl_namespace, pl_title
2342                              FROM !
2343                         LEFT JOIN !
2344                                ON pl_namespace=page_namespace
2345                               AND pl_title=page_title
2346                             WHERE pl_from=?
2347                               AND page_namespace IS NULL
2348                                   !",
2349                         $db->tableName( 'pagelinks' ),
2350                         $db->tableName( 'page' ),
2351                         $this->getArticleId(),
2352                         $options );
2353
2354                 $retVal = array();
2355                 if ( $db->numRows( $res ) ) {
2356                         foreach( $res as $row ) {
2357                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2358                         }
2359                 }
2360                 $db->freeResult( $res );
2361                 return $retVal;
2362         }
2363
2364
2365         /**
2366          * Get a list of URLs to purge from the Squid cache when this
2367          * page changes
2368          *
2369          * @return array the URLs
2370          */
2371         public function getSquidURLs() {
2372                 global $wgContLang;
2373
2374                 $urls = array(
2375                         $this->getInternalURL(),
2376                         $this->getInternalURL( 'action=history' )
2377                 );
2378
2379                 // purge variant urls as well
2380                 if($wgContLang->hasVariants()){
2381                         $variants = $wgContLang->getVariants();
2382                         foreach($variants as $vCode){
2383                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2384                                 $urls[] = $this->getInternalURL('',$vCode);
2385                         }
2386                 }
2387
2388                 return $urls;
2389         }
2390
2391         public function purgeSquid() {
2392                 global $wgUseSquid;
2393                 if ( $wgUseSquid ) {
2394                         $urls = $this->getSquidURLs();
2395                         $u = new SquidUpdate( $urls );
2396                         $u->doUpdate();
2397                 }
2398         }
2399
2400         /**
2401          * Move this page without authentication
2402          * @param Title &$nt the new page Title
2403          */
2404         public function moveNoAuth( &$nt ) {
2405                 return $this->moveTo( $nt, false );
2406         }
2407
2408         /**
2409          * Check whether a given move operation would be valid.
2410          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2411          * @param Title &$nt the new title
2412          * @param bool $auth indicates whether $wgUser's permissions
2413          *      should be checked
2414          * @param string $reason is the log summary of the move, used for spam checking
2415          * @return mixed True on success, getUserPermissionsErrors()-like array on failure
2416          */
2417         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2418                 $errors = array();
2419                 if( !$nt ) {
2420                         // Normally we'd add this to $errors, but we'll get
2421                         // lots of syntax errors if $nt is not an object
2422                         return array(array('badtitletext'));
2423                 }
2424                 if( $this->equals( $nt ) ) {
2425                         $errors[] = array('selfmove');
2426                 }
2427                 if( !$this->isMovable() || !$nt->isMovable() ) {
2428                         $errors[] = array('immobile_namespace');
2429                 }
2430
2431                 $oldid = $this->getArticleID();
2432                 $newid = $nt->getArticleID();
2433
2434                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2435                         $errors[] = array('articleexists');
2436                 }
2437                 if ( ( '' == $this->getDBkey() ) ||
2438                          ( !$oldid ) ||
2439                      ( '' == $nt->getDBkey() ) ) {
2440                         $errors[] = array('badarticleerror');
2441                 }
2442
2443                 // Image-specific checks
2444                 if( $this->getNamespace() == NS_IMAGE ) {
2445                         $file = wfLocalFile( $this );
2446                         if( $file->exists() ) {
2447                                 if( $nt->getNamespace() != NS_IMAGE ) {
2448                                         $errors[] = array('imagenocrossnamespace');
2449                                 }
2450                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2451                                         $errors[] = array('imageinvalidfilename');
2452                                 }
2453                                 if( !File::checkExtensionCompatibility( $file, $nt->getDbKey() ) ) {
2454                                         $errors[] = array('imagetypemismatch');
2455                                 }
2456                         }
2457                 }
2458
2459                 if ( $auth ) {
2460                         global $wgUser;
2461                         $errors = array_merge($errors,
2462                                         $this->getUserPermissionsErrors('move', $wgUser),
2463                                         $this->getUserPermissionsErrors('edit', $wgUser),
2464                                         $nt->getUserPermissionsErrors('move', $wgUser),
2465                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2466                 }
2467
2468                 global $wgUser;
2469                 $err = null;
2470                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2471                         $errors[] = array('hookaborted', $err);
2472                 }
2473
2474                 # The move is allowed only if (1) the target doesn't exist, or
2475                 # (2) the target is a redirect to the source, and has no history
2476                 # (so we can undo bad moves right after they're done).
2477
2478                 if ( 0 != $newid ) { # Target exists; check for validity
2479                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2480                                 $errors[] = array('articleexists');
2481                         }
2482                 } else {
2483                         $tp = $nt->getTitleProtection();
2484                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2485                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2486                                 $errors[] = array('cantmove-titleprotected');
2487                         }
2488                 }
2489                 if(empty($errors))
2490                         return true;
2491                 return $errors;
2492         }
2493
2494         /**
2495          * Move a title to a new location
2496          * @param Title &$nt the new title
2497          * @param bool $auth indicates whether $wgUser's permissions
2498          *      should be checked
2499          * @param string $reason The reason for the move
2500          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2501          *  Ignored if the user doesn't have the suppressredirect right.
2502          * @return mixed true on success, getUserPermissionsErrors()-like array on failure
2503          */
2504         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2505                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2506                 if( is_array( $err ) ) {
2507                         return $err;
2508                 }
2509
2510                 $pageid = $this->getArticleID();
2511                 if( $nt->exists() ) {
2512                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2513                         $pageCountChange = ($createRedirect ? 0 : -1);
2514                 } else { # Target didn't exist, do normal move.
2515                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2516                         $pageCountChange = ($createRedirect ? 1 : 0);
2517                 }
2518
2519                 if( is_array( $err ) ) {
2520                         return $err;
2521                 }
2522                 $redirid = $this->getArticleID();
2523
2524                 // Category memberships include a sort key which may be customized.
2525                 // If it's left as the default (the page title), we need to update
2526                 // the sort key to match the new title.
2527                 //
2528                 // Be careful to avoid resetting cl_timestamp, which may disturb
2529                 // time-based lists on some sites.
2530                 //
2531                 // Warning -- if the sort key is *explicitly* set to the old title,
2532                 // we can't actually distinguish it from a default here, and it'll
2533                 // be set to the new title even though it really shouldn't.
2534                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2535                 $dbw = wfGetDB( DB_MASTER );
2536                 $dbw->update( 'categorylinks',
2537                         array(
2538                                 'cl_sortkey' => $nt->getPrefixedText(),
2539                                 'cl_timestamp=cl_timestamp' ),
2540                         array(
2541                                 'cl_from' => $pageid,
2542                                 'cl_sortkey' => $this->getPrefixedText() ),
2543                         __METHOD__ );
2544
2545                 # Update watchlists
2546
2547                 $oldnamespace = $this->getNamespace() & ~1;
2548                 $newnamespace = $nt->getNamespace() & ~1;
2549                 $oldtitle = $this->getDBkey();
2550                 $newtitle = $nt->getDBkey();
2551
2552                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2553                         WatchedItem::duplicateEntries( $this, $nt );
2554                 }
2555
2556                 # Update search engine
2557                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2558                 $u->doUpdate();
2559                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2560                 $u->doUpdate();
2561
2562                 # Update site_stats
2563                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2564                         # No longer a content page
2565                         # Not viewed, edited, removing
2566                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2567                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2568                         # Now a content page
2569                         # Not viewed, edited, adding
2570                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2571                 } elseif( $pageCountChange ) {
2572                         # Redirect added
2573                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2574                 } else {
2575                         # Nothing special
2576                         $u = false;
2577                 }
2578                 if( $u )
2579                         $u->doUpdate();
2580                 # Update message cache for interface messages
2581                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2582                         global $wgMessageCache;
2583                         $oldarticle = new Article( $this );
2584                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2585                         $newarticle = new Article( $nt );
2586                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2587                 }
2588
2589                 global $wgUser;
2590                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2591                 return true;
2592         }
2593
2594         /**
2595          * Move page to a title which is at present a redirect to the
2596          * source page
2597          *
2598          * @param Title &$nt the page to move to, which should currently
2599          *      be a redirect
2600          * @param string $reason The reason for the move
2601          * @param bool $createRedirect Whether to leave a redirect at the old title.
2602          *  Ignored if the user doesn't have the suppressredirect right
2603          */
2604         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2605                 global $wgUseSquid, $wgUser;
2606                 $fname = 'Title::moveOverExistingRedirect';
2607                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2608
2609                 if ( $reason ) {
2610                         $comment .= ": $reason";
2611                 }
2612
2613                 $now = wfTimestampNow();
2614                 $newid = $nt->getArticleID();
2615                 $oldid = $this->getArticleID();
2616                 $latest = $this->getLatestRevID();
2617
2618                 $dbw = wfGetDB( DB_MASTER );
2619                 $dbw->begin();
2620
2621                 # Delete the old redirect. We don't save it to history since
2622                 # by definition if we've got here it's rather uninteresting.
2623                 # We have to remove it so that the next step doesn't trigger
2624                 # a conflict on the unique namespace+title index...
2625                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2626                 if ( !$dbw->cascadingDeletes() ) {
2627                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2628                         global $wgUseTrackbacks;
2629                         if ($wgUseTrackbacks)
2630                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2631                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2632                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2633                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2634                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2635                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2636                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2637                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2638                 }
2639
2640                 # Save a null revision in the page's history notifying of the move
2641                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2642                 $nullRevId = $nullRevision->insertOn( $dbw );
2643
2644                 $article = new Article( $this );
2645                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2646
2647                 # Change the name of the target page:
2648                 $dbw->update( 'page',
2649                         /* SET */ array(
2650                                 'page_touched'   => $dbw->timestamp($now),
2651                                 'page_namespace' => $nt->getNamespace(),
2652                                 'page_title'     => $nt->getDBkey(),
2653                                 'page_latest'    => $nullRevId,
2654                         ),
2655                         /* WHERE */ array( 'page_id' => $oldid ),
2656                         $fname
2657                 );
2658                 $nt->resetArticleID( $oldid );
2659
2660                 # Recreate the redirect, this time in the other direction.
2661                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2662                         $mwRedir = MagicWord::get( 'redirect' );
2663                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2664                         $redirectArticle = new Article( $this );
2665                         $newid = $redirectArticle->insertOn( $dbw );
2666                         $redirectRevision = new Revision( array(
2667                                 'page'    => $newid,
2668                                 'comment' => $comment,
2669                                 'text'    => $redirectText ) );
2670                         $redirectRevision->insertOn( $dbw );
2671                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2672
2673                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2674
2675                         # Now, we record the link from the redirect to the new title.
2676                         # It should have no other outgoing links...
2677                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2678                         $dbw->insert( 'pagelinks',
2679                                 array(
2680                                         'pl_from'      => $newid,
2681                                         'pl_namespace' => $nt->getNamespace(),
2682                                         'pl_title'     => $nt->getDBkey() ),
2683                                 $fname );
2684                 } else {
2685                         $this->resetArticleID( 0 );
2686                 }
2687
2688                 # Move an image if this is a file
2689                 if( $this->getNamespace() == NS_IMAGE ) {
2690                         $file = wfLocalFile( $this );
2691                         if( $file->exists() ) {
2692                                 $status = $file->move( $nt );
2693                                 if( !$status->isOk() ) {
2694                                         $dbw->rollback();
2695                                         return $status->getErrorsArray();
2696                                 }
2697                         }
2698                 }
2699                 $dbw->commit();
2700
2701                 # Log the move
2702                 $log = new LogPage( 'move' );
2703                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2704
2705                 # Purge squid
2706                 if ( $wgUseSquid ) {
2707                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2708                         $u = new SquidUpdate( $urls );
2709                         $u->doUpdate();
2710                 }
2711
2712         }
2713
2714         /**
2715          * Move page to non-existing title.
2716          * @param Title &$nt the new Title
2717          * @param string $reason The reason for the move
2718          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2719          *  Ignored if the user doesn't have the suppressredirect right
2720          */
2721         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2722                 global $wgUseSquid, $wgUser;
2723                 $fname = 'MovePageForm::moveToNewTitle';
2724                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2725                 if ( $reason ) {
2726                         $comment .= ": $reason";
2727                 }
2728
2729                 $newid = $nt->getArticleID();
2730                 $oldid = $this->getArticleID();
2731                 $latest = $this->getLatestRevId();
2732
2733                 $dbw = wfGetDB( DB_MASTER );
2734                 $dbw->begin();
2735                 $now = $dbw->timestamp();
2736
2737                 # Save a null revision in the page's history notifying of the move
2738                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2739                 $nullRevId = $nullRevision->insertOn( $dbw );
2740
2741                 $article = new Article( $this );
2742                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2743
2744                 # Rename page entry
2745                 $dbw->update( 'page',
2746                         /* SET */ array(
2747                                 'page_touched'   => $now,
2748                                 'page_namespace' => $nt->getNamespace(),
2749                                 'page_title'     => $nt->getDBkey(),
2750                                 'page_latest'    => $nullRevId,
2751                         ),
2752                         /* WHERE */ array( 'page_id' => $oldid ),
2753                         $fname
2754                 );
2755                 $nt->resetArticleID( $oldid );
2756
2757                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2758                         # Insert redirect
2759                         $mwRedir = MagicWord::get( 'redirect' );
2760                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2761                         $redirectArticle = new Article( $this );
2762                         $newid = $redirectArticle->insertOn( $dbw );
2763                         $redirectRevision = new Revision( array(
2764                                 'page'    => $newid,
2765                                 'comment' => $comment,
2766                                 'text'    => $redirectText ) );
2767                         $redirectRevision->insertOn( $dbw );
2768                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2769
2770                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2771
2772                         # Record the just-created redirect's linking to the page
2773                         $dbw->insert( 'pagelinks',
2774                                 array(
2775                                         'pl_from'      => $newid,
2776                                         'pl_namespace' => $nt->getNamespace(),
2777                                         'pl_title'     => $nt->getDBkey() ),
2778                                 $fname );
2779                 } else {
2780                         $this->resetArticleID( 0 );
2781                 }
2782
2783                 # Move an image if this is a file
2784                 if( $this->getNamespace() == NS_IMAGE ) {
2785                         $file = wfLocalFile( $this );
2786                         if( $file->exists() ) {
2787                                 $status = $file->move( $nt );
2788                                 if( !$status->isOk() ) {
2789                                         $dbw->rollback();
2790                                         return $status->getErrorsArray();
2791                                 }
2792                         }
2793                 }
2794                 $dbw->commit();
2795
2796                 # Log the move
2797                 $log = new LogPage( 'move' );
2798                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2799
2800                 # Purge caches as per article creation
2801                 Article::onArticleCreate( $nt );
2802
2803                 # Purge old title from squid
2804                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2805                 $this->purgeSquid();
2806
2807         }
2808
2809         /**
2810          * Checks if $this can be moved to a given Title
2811          * - Selects for update, so don't call it unless you mean business
2812          *
2813          * @param Title &$nt the new title to check
2814          */
2815         public function isValidMoveTarget( $nt ) {
2816
2817                 $fname = 'Title::isValidMoveTarget';
2818                 $dbw = wfGetDB( DB_MASTER );
2819
2820                 # Is it an existsing file?
2821                 if( $nt->getNamespace() == NS_IMAGE ) {
2822                         $file = wfLocalFile( $nt );
2823                         if( $file->exists() ) {
2824                                 wfDebug( __METHOD__ . ": file exists\n" );
2825                                 return false;
2826                         }
2827                 }
2828
2829                 # Is it a redirect?
2830                 $id  = $nt->getArticleID();
2831                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2832                         array( 'page_is_redirect','old_text','old_flags' ),
2833                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2834                         $fname, 'FOR UPDATE' );
2835
2836                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2837                         # Not a redirect
2838                         wfDebug( __METHOD__ . ": not a redirect\n" );
2839                         return false;
2840                 }
2841                 $text = Revision::getRevisionText( $obj );
2842
2843                 # Does the redirect point to the source?
2844                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2845                 $m = array();
2846                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2847                         $redirTitle = Title::newFromText( $m[1] );
2848                         if( !is_object( $redirTitle ) ||
2849                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2850                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2851                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2852                                 return false;
2853                         }
2854                 } else {
2855                         # Fail safe
2856                         wfDebug( __METHOD__ . ": failsafe\n" );
2857                         return false;
2858                 }
2859
2860                 # Does the article have a history?
2861                 $row = $dbw->selectRow( array( 'page', 'revision'),
2862                         array( 'rev_id' ),
2863                         array( 'page_namespace' => $nt->getNamespace(),
2864                                 'page_title' => $nt->getDBkey(),
2865                                 'page_id=rev_page AND page_latest != rev_id'
2866                         ), $fname, 'FOR UPDATE'
2867                 );
2868
2869                 # Return true if there was no history
2870                 return $row === false;
2871         }
2872
2873         /**
2874          * Can this title be added to a user's watchlist?
2875          *
2876          * @return bool
2877          */
2878         public function isWatchable() {
2879                 return !$this->isExternal()
2880                         && MWNamespace::isWatchable( $this->getNamespace() );
2881         }
2882
2883         /**
2884          * Get categories to which this Title belongs and return an array of
2885          * categories' names.
2886          *
2887          * @return array an array of parents in the form:
2888          *      $parent => $currentarticle
2889          */
2890         public function getParentCategories() {
2891                 global $wgContLang;
2892
2893                 $titlekey = $this->getArticleId();
2894                 $dbr = wfGetDB( DB_SLAVE );
2895                 $categorylinks = $dbr->tableName( 'categorylinks' );
2896
2897                 # NEW SQL
2898                 $sql = "SELECT * FROM $categorylinks"
2899                      ." WHERE cl_from='$titlekey'"
2900                          ." AND cl_from <> '0'"
2901                          ." ORDER BY cl_sortkey";
2902
2903                 $res = $dbr->query( $sql );
2904
2905                 if( $dbr->numRows( $res ) > 0 ) {
2906                         foreach( $res as $row )
2907                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
2908                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
2909                         $dbr->freeResult( $res );
2910                 } else {
2911                         $data = array();
2912                 }
2913                 return $data;
2914         }
2915
2916         /**
2917          * Get a tree of parent categories
2918          * @param array $children an array with the children in the keys, to check for circular refs
2919          * @return array
2920          */
2921         public function getParentCategoryTree( $children = array() ) {
2922                 $stack = array();
2923                 $parents = $this->getParentCategories();
2924
2925                 if( $parents ) {
2926                         foreach( $parents as $parent => $current ) {
2927                                 if ( array_key_exists( $parent, $children ) ) {
2928                                         # Circular reference
2929                                         $stack[$parent] = array();
2930                                 } else {
2931                                         $nt = Title::newFromText($parent);
2932                                         if ( $nt ) {
2933                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2934                                         }
2935                                 }
2936                         }
2937                         return $stack;
2938                 } else {
2939                         return array();
2940                 }
2941         }
2942
2943
2944         /**
2945          * Get an associative array for selecting this title from
2946          * the "page" table
2947          *
2948          * @return array
2949          */
2950         public function pageCond() {
2951                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2952         }
2953
2954         /**
2955          * Get the revision ID of the previous revision
2956          *
2957          * @param integer $revId Revision ID. Get the revision that was before this one.
2958          * @param integer $flags, GAID_FOR_UPDATE
2959          * @return integer $oldrevision|false
2960          */
2961         public function getPreviousRevisionID( $revId, $flags=0 ) {
2962                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
2963                 return $db->selectField( 'revision', 'rev_id',
2964                         array(
2965                                 'rev_page' => $this->getArticleId($flags),
2966                                 'rev_id < ' . intval( $revId )
2967                         ),
2968                         __METHOD__,
2969                         array( 'ORDER BY' => 'rev_id DESC' )
2970                 );
2971         }
2972
2973         /**
2974          * Get the revision ID of the next revision
2975          *
2976          * @param integer $revId Revision ID. Get the revision that was after this one.
2977          * @param integer $flags, GAID_FOR_UPDATE
2978          * @return integer $oldrevision|false
2979          */
2980         public function getNextRevisionID( $revId, $flags=0 ) {
2981                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
2982                 return $db->selectField( 'revision', 'rev_id',
2983                         array(
2984                                 'rev_page' => $this->getArticleId($flags),
2985                                 'rev_id > ' . intval( $revId )
2986                         ),
2987                         __METHOD__,
2988                         array( 'ORDER BY' => 'rev_id' )
2989                 );
2990         }
2991
2992         /**
2993          * Get the number of revisions between the given revision IDs.
2994          * Used for diffs and other things that really need it.
2995          *
2996          * @param integer $old  Revision ID.
2997          * @param integer $new  Revision ID.
2998          * @return integer  Number of revisions between these IDs.
2999          */
3000         public function countRevisionsBetween( $old, $new ) {
3001                 $dbr = wfGetDB( DB_SLAVE );
3002                 return $dbr->selectField( 'revision', 'count(*)',
3003                         'rev_page = ' . intval( $this->getArticleId() ) .
3004                         ' AND rev_id > ' . intval( $old ) .
3005                         ' AND rev_id < ' . intval( $new ),
3006                         __METHOD__,
3007                         array( 'USE INDEX' => 'PRIMARY' ) );
3008         }
3009
3010         /**
3011          * Compare with another title.
3012          *
3013          * @param Title $title
3014          * @return bool
3015          */
3016         public function equals( Title $title ) {
3017                 // Note: === is necessary for proper matching of number-like titles.
3018                 return $this->getInterwiki() === $title->getInterwiki()
3019                         && $this->getNamespace() == $title->getNamespace()
3020                         && $this->getDBkey() === $title->getDBkey();
3021         }
3022
3023         /**
3024          * Callback for usort() to do title sorts by (namespace, title)
3025          */
3026         static function compare( $a, $b ) {
3027                 if( $a->getNamespace() == $b->getNamespace() ) {
3028                         return strcmp( $a->getText(), $b->getText() );
3029                 } else {
3030                         return $a->getNamespace() - $b->getNamespace();
3031                 }
3032         }
3033
3034         /**
3035          * Return a string representation of this title
3036          *
3037          * @return string
3038          */
3039         public function __toString() {
3040                 return $this->getPrefixedText();
3041         }
3042
3043         /**
3044          * Check if page exists
3045          * @return bool
3046          */
3047         public function exists() {
3048                 return $this->getArticleId() != 0;
3049         }
3050
3051         /**
3052          * Do we know that this title definitely exists, or should we otherwise
3053          * consider that it exists?
3054          *
3055          * @return bool
3056          */
3057         public function isAlwaysKnown() {
3058                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3059                 // the full l10n of that language to be loaded. That takes much memory and
3060                 // isn't needed. So we strip the language part away.
3061                 // Also, extension messages which are not loaded, are shown as red, because
3062                 // we don't call MessageCache::loadAllMessages.
3063                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3064                 return $this->isExternal()
3065                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
3066                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
3067         }
3068
3069         /**
3070          * Update page_touched timestamps and send squid purge messages for
3071          * pages linking to this title. May be sent to the job queue depending
3072          * on the number of links. Typically called on create and delete.
3073          */
3074         public function touchLinks() {
3075                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3076                 $u->doUpdate();
3077
3078                 if ( $this->getNamespace() == NS_CATEGORY ) {
3079                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3080                         $u->doUpdate();
3081                 }
3082         }
3083
3084         /**
3085          * Get the last touched timestamp
3086          */
3087         public function getTouched() {
3088                 $dbr = wfGetDB( DB_SLAVE );
3089                 $touched = $dbr->selectField( 'page', 'page_touched',
3090                         array(
3091                                 'page_namespace' => $this->getNamespace(),
3092                                 'page_title' => $this->getDBkey()
3093                         ), __METHOD__
3094                 );
3095                 return $touched;
3096         }
3097
3098         public function trackbackURL() {
3099                 global $wgTitle, $wgScriptPath, $wgServer;
3100
3101                 return "$wgServer$wgScriptPath/trackback.php?article="
3102                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
3103         }
3104
3105         public function trackbackRDF() {
3106                 $url = htmlspecialchars($this->getFullURL());
3107                 $title = htmlspecialchars($this->getText());
3108                 $tburl = $this->trackbackURL();
3109
3110                 // Autodiscovery RDF is placed in comments so HTML validator
3111                 // won't barf. This is a rather icky workaround, but seems
3112                 // frequently used by this kind of RDF thingy.
3113                 //
3114                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3115                 return "<!--
3116 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3117          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3118          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3119 <rdf:Description
3120    rdf:about=\"$url\"
3121    dc:identifier=\"$url\"
3122    dc:title=\"$title\"
3123    trackback:ping=\"$tburl\" />
3124 </rdf:RDF>
3125 -->";
3126         }
3127
3128         /**
3129          * Generate strings used for xml 'id' names in monobook tabs
3130          * @return string
3131          */
3132         public function getNamespaceKey() {
3133                 global $wgContLang;
3134                 switch ($this->getNamespace()) {
3135                         case NS_MAIN:
3136                         case NS_TALK:
3137                                 return 'nstab-main';
3138                         case NS_USER:
3139                         case NS_USER_TALK:
3140                                 return 'nstab-user';
3141                         case NS_MEDIA:
3142                                 return 'nstab-media';
3143                         case NS_SPECIAL:
3144                                 return 'nstab-special';
3145                         case NS_PROJECT:
3146                         case NS_PROJECT_TALK:
3147                                 return 'nstab-project';
3148                         case NS_IMAGE:
3149                         case NS_IMAGE_TALK:
3150                                 return 'nstab-image';
3151                         case NS_MEDIAWIKI:
3152                         case NS_MEDIAWIKI_TALK:
3153                                 return 'nstab-mediawiki';
3154                         case NS_TEMPLATE:
3155                         case NS_TEMPLATE_TALK:
3156                                 return 'nstab-template';
3157                         case NS_HELP:
3158                         case NS_HELP_TALK:
3159                                 return 'nstab-help';
3160                         case NS_CATEGORY:
3161                         case NS_CATEGORY_TALK:
3162                                 return 'nstab-category';
3163                         default:
3164                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3165                 }
3166         }
3167
3168         /**
3169          * Returns true if this title resolves to the named special page
3170          * @param string $name The special page name
3171          */
3172         public function isSpecial( $name ) {
3173                 if ( $this->getNamespace() == NS_SPECIAL ) {
3174                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3175                         if ( $name == $thisName ) {
3176                                 return true;
3177                         }
3178                 }
3179                 return false;
3180         }
3181
3182         /**
3183          * If the Title refers to a special page alias which is not the local default,
3184          * returns a new Title which points to the local default. Otherwise, returns $this.
3185          */
3186         public function fixSpecialName() {
3187                 if ( $this->getNamespace() == NS_SPECIAL ) {
3188                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3189                         if ( $canonicalName ) {
3190                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3191                                 if ( $localName != $this->mDbkeyform ) {
3192                                         return Title::makeTitle( NS_SPECIAL, $localName );
3193                                 }
3194                         }
3195                 }
3196                 return $this;
3197         }
3198
3199         /**
3200          * Is this Title in a namespace which contains content?
3201          * In other words, is this a content page, for the purposes of calculating
3202          * statistics, etc?
3203          *
3204          * @return bool
3205          */
3206         public function isContentPage() {
3207                 return MWNamespace::isContent( $this->getNamespace() );
3208         }
3209
3210         public function getRedirectsHere( $ns = null ) {
3211                 $redirs = array();
3212
3213                 $dbr = wfGetDB( DB_SLAVE );
3214                 $where = array(
3215                         'rd_namespace' => $this->getNamespace(),
3216                         'rd_title' => $this->getDBkey(),
3217                         'rd_from = page_id'
3218                 );
3219                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3220
3221                 $res = $dbr->select(
3222                         array( 'redirect', 'page' ),
3223                         array( 'page_namespace', 'page_title' ),
3224                         $where,
3225                         __METHOD__
3226                 );
3227
3228
3229                 foreach( $res as $row ) {
3230                         $redirs[] = self::newFromRow( $row );
3231                 }
3232                 return $redirs;
3233         }
3234 }