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                 $text = trim($text);
 300                 if( $redir->matchStartAndRemove( $text ) ) {
 301                         // Extract the first link and see if it's usable
 302                         // Ensure that it really does come directly after #REDIRECT
 303                         $m = array();
 304                         if( preg_match( '!^\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 305                                 // Strip preceding colon used to "escape" categories, etc.
 306                                 // and URL-decode links
 307                                 if( strpos( $m[1], '%' ) !== false ) {
 308                                         // Match behavior of inline link parsing here;
 309                                         // don't interpret + as " " most of the time!
 310                                         // It might be safe to just use rawurldecode instead, though.
 311                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 312                                 }
 313                                 $title = Title::newFromText( $m[1] );
 314                                 // Redirects to Special:Userlogout are not permitted
 315                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 316                                         return $title;
 317                         }
 318                 }
 319                 return null;
 320         }
 321
 322 #----------------------------------------------------------------------------
 323 #       Static functions
 324 #----------------------------------------------------------------------------
 325
 326         /**
 327          * Get the prefixed DB key associated with an ID
 328          * @param int $id the page_id of the article
 329          * @return Title an object representing the article, or NULL
 330          *      if no such article was found
 331          */
 332         public static function nameOf( $id ) {
 333                 $dbr = wfGetDB( DB_SLAVE );
 334
 335                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), __METHOD__ );
 336                 if ( $s === false ) { return NULL; }
 337
 338                 $n = self::makeName( $s->page_namespace, $s->page_title );
 339                 return $n;
 340         }
 341
 342         /**
 343          * Get a regex character class describing the legal characters in a link
 344          * @return string the list of characters, not delimited
 345          */
 346         public static function legalChars() {
 347                 global $wgLegalTitleChars;
 348                 return $wgLegalTitleChars;
 349         }
 350
 351         /**
 352          * Get a string representation of a title suitable for
 353          * including in a search index
 354          *
 355          * @param int $ns a namespace index
 356          * @param string $title text-form main part
 357          * @return string a stripped-down title string ready for the
 358          *      search index
 359          */
 360         public static function indexTitle( $ns, $title ) {
 361                 global $wgContLang;
 362
 363                 $lc = SearchEngine::legalSearchChars() . '&#;';
 364                 $t = $wgContLang->stripForSearch( $title );
 365                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 366                 $t = $wgContLang->lc( $t );
 367
 368                 # Handle 's, s'
 369                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 370                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 371
 372                 $t = preg_replace( "/\\s+/", ' ', $t );
 373
 374                 if ( $ns == NS_IMAGE ) {
 375                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 376                 }
 377                 return trim( $t );
 378         }
 379
 380         /*
 381          * Make a prefixed DB key from a DB key and a namespace index
 382          * @param int $ns numerical representation of the namespace
 383          * @param string $title the DB key form the title
 384          * @param string $fragment The link fragment (after the "#")
 385          * @return string the prefixed form of the title
 386          */
 387         public static function makeName( $ns, $title, $fragment = '' ) {
 388                 global $wgContLang;
 389
 390                 $namespace = $wgContLang->getNsText( $ns );
 391                 $name = $namespace == '' ? $title : "$namespace:$title";
 392                 if ( strval( $fragment ) != '' ) {
 393                         $name .= '#' . $fragment;
 394                 }
 395                 return $name;
 396         }
 397
 398         /**
 399          * Returns the URL associated with an interwiki prefix
 400          * @param string $key the interwiki prefix (e.g. "MeatBall")
 401          * @return the associated URL, containing "$1", which should be
 402          *      replaced by an article title
 403          * @static (arguably)
 404          */
 405         public function getInterwikiLink( $key )  {
 406                 global $wgMemc, $wgInterwikiExpiry;
 407                 global $wgInterwikiCache, $wgContLang;
 408                 $fname = 'Title::getInterwikiLink';
 409
 410                 $key = $wgContLang->lc( $key );
 411
 412                 $k = wfMemcKey( 'interwiki', $key );
 413                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 414                         return Title::$interwikiCache[$k]->iw_url;
 415                 }
 416
 417                 if ($wgInterwikiCache) {
 418                         return Title::getInterwikiCached( $key );
 419                 }
 420
 421                 $s = $wgMemc->get( $k );
 422                 # Ignore old keys with no iw_local
 423                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 424                         Title::$interwikiCache[$k] = $s;
 425                         return $s->iw_url;
 426                 }
 427
 428                 $dbr = wfGetDB( DB_SLAVE );
 429                 $res = $dbr->select( 'interwiki',
 430                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 431                         array( 'iw_prefix' => $key ), $fname );
 432                 if( !$res ) {
 433                         return '';
 434                 }
 435
 436                 $s = $dbr->fetchObject( $res );
 437                 if( !$s ) {
 438                         # Cache non-existence: create a blank object and save it to memcached
 439                         $s = (object)false;
 440                         $s->iw_url = '';
 441                         $s->iw_local = 0;
 442                         $s->iw_trans = 0;
 443                 }
 444                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 445                 Title::$interwikiCache[$k] = $s;
 446
 447                 return $s->iw_url;
 448         }
 449
 450         /**
 451          * Fetch interwiki prefix data from local cache in constant database
 452          *
 453          * More logic is explained in DefaultSettings
 454          *
 455          * @return string URL of interwiki site
 456          */
 457         public static function getInterwikiCached( $key ) {
 458                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 459                 static $db, $site;
 460
 461                 if (!$db)
 462                         $db=dba_open($wgInterwikiCache,'r','cdb');
 463                 /* Resolve site name */
 464                 if ($wgInterwikiScopes>=3 and !$site) {
 465                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 466                         if ($site=="")
 467                                 $site = $wgInterwikiFallbackSite;
 468                 }
 469                 $value = dba_fetch( wfMemcKey( $key ), $db);
 470                 if ($value=='' and $wgInterwikiScopes>=3) {
 471                         /* try site-level */
 472                         $value = dba_fetch("_{$site}:{$key}", $db);
 473                 }
 474                 if ($value=='' and $wgInterwikiScopes>=2) {
 475                         /* try globals */
 476                         $value = dba_fetch("__global:{$key}", $db);
 477                 }
 478                 if ($value=='undef')
 479                         $value='';
 480                 $s = (object)false;
 481                 $s->iw_url = '';
 482                 $s->iw_local = 0;
 483                 $s->iw_trans = 0;
 484                 if ($value!='') {
 485                         list($local,$url)=explode(' ',$value,2);
 486                         $s->iw_url=$url;
 487                         $s->iw_local=(int)$local;
 488                 }
 489                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 490                 return $s->iw_url;
 491         }
 492         /**
 493          * Determine whether the object refers to a page within
 494          * this project.
 495          *
 496          * @return bool TRUE if this is an in-project interwiki link
 497          *      or a wikilink, FALSE otherwise
 498          */
 499         public function isLocal() {
 500                 if ( $this->mInterwiki != '' ) {
 501                         # Make sure key is loaded into cache
 502                         $this->getInterwikiLink( $this->mInterwiki );
 503                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 504                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 505                 } else {
 506                         return true;
 507                 }
 508         }
 509
 510         /**
 511          * Determine whether the object refers to a page within
 512          * this project and is transcludable.
 513          *
 514          * @return bool TRUE if this is transcludable
 515          */
 516         public function isTrans() {
 517                 if ($this->mInterwiki == '')
 518                         return false;
 519                 # Make sure key is loaded into cache
 520                 $this->getInterwikiLink( $this->mInterwiki );
 521                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 522                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 523         }
 524
 525         /**
 526          * Escape a text fragment, say from a link, for a URL
 527          */
 528         static function escapeFragmentForURL( $fragment ) {
 529                 $fragment = str_replace( ' ', '_', $fragment );
 530                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 531                 $replaceArray = array(
 532                         '%3A' => ':',
 533                         '%' => '.'
 534                 );
 535                 return strtr( $fragment, $replaceArray );
 536         }
 537
 538 #----------------------------------------------------------------------------
 539 #       Other stuff
 540 #----------------------------------------------------------------------------
 541
 542         /** Simple accessors */
 543         /**
 544          * Get the text form (spaces not underscores) of the main part
 545          * @return string
 546          */
 547         public function getText() { return $this->mTextform; }
 548         /**
 549          * Get the URL-encoded form of the main part
 550          * @return string
 551          */
 552         public function getPartialURL() { return $this->mUrlform; }
 553         /**
 554          * Get the main part with underscores
 555          * @return string
 556          */
 557         public function getDBkey() { return $this->mDbkeyform; }
 558         /**
 559          * Get the namespace index, i.e. one of the NS_xxxx constants
 560          * @return int
 561          */
 562         public function getNamespace() { return $this->mNamespace; }
 563         /**
 564          * Get the namespace text
 565          * @return string
 566          */
 567         public function getNsText() {
 568                 global $wgContLang, $wgCanonicalNamespaceNames;
 569
 570                 if ( '' != $this->mInterwiki ) {
 571                         // This probably shouldn't even happen. ohh man, oh yuck.
 572                         // But for interwiki transclusion it sometimes does.
 573                         // Shit. Shit shit shit.
 574                         //
 575                         // Use the canonical namespaces if possible to try to
 576                         // resolve a foreign namespace.
 577                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 578                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 579                         }
 580                 }
 581                 return $wgContLang->getNsText( $this->mNamespace );
 582         }
 583         /**
 584          * Get the DB key with the initial letter case as specified by the user
 585          */
 586         function getUserCaseDBKey() {
 587                 return $this->mUserCaseDBKey;
 588         }
 589         /**
 590          * Get the namespace text of the subject (rather than talk) page
 591          * @return string
 592          */
 593         public function getSubjectNsText() {
 594                 global $wgContLang;
 595                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 596         }
 597
 598         /**
 599          * Get the namespace text of the talk page
 600          * @return string
 601          */
 602         public function getTalkNsText() {
 603                 global $wgContLang;
 604                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 605         }
 606
 607         /**
 608          * Could this title have a corresponding talk page?
 609          * @return bool
 610          */
 611         public function canTalk() {
 612                 return( MWNamespace::canTalk( $this->mNamespace ) );
 613         }
 614
 615         /**
 616          * Get the interwiki prefix (or null string)
 617          * @return string
 618          */
 619         public function getInterwiki() { return $this->mInterwiki; }
 620         /**
 621          * Get the Title fragment (i.e. the bit after the #) in text form
 622          * @return string
 623          */
 624         public function getFragment() { return $this->mFragment; }
 625         /**
 626          * Get the fragment in URL form, including the "#" character if there is one
 627          * @return string
 628          */
 629         public function getFragmentForURL() {
 630                 if ( $this->mFragment == '' ) {
 631                         return '';
 632                 } else {
 633                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 634                 }
 635         }
 636         /**
 637          * Get the default namespace index, for when there is no namespace
 638          * @return int
 639          */
 640         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 641
 642         /**
 643          * Get title for search index
 644          * @return string a stripped-down title string ready for the
 645          *      search index
 646          */
 647         public function getIndexTitle() {
 648                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 649         }
 650
 651         /**
 652          * Get the prefixed database key form
 653          * @return string the prefixed title, with underscores and
 654          *      any interwiki and namespace prefixes
 655          */
 656         public function getPrefixedDBkey() {
 657                 $s = $this->prefix( $this->mDbkeyform );
 658                 $s = str_replace( ' ', '_', $s );
 659                 return $s;
 660         }
 661
 662         /**
 663          * Get the prefixed title with spaces.
 664          * This is the form usually used for display
 665          * @return string the prefixed title, with spaces
 666          */
 667         public function getPrefixedText() {
 668                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 669                         $s = $this->prefix( $this->mTextform );
 670                         $s = str_replace( '_', ' ', $s );
 671                         $this->mPrefixedText = $s;
 672                 }
 673                 return $this->mPrefixedText;
 674         }
 675
 676         /**
 677          * Get the prefixed title with spaces, plus any fragment
 678          * (part beginning with '#')
 679          * @return string the prefixed title, with spaces and
 680          *      the fragment, including '#'
 681          */
 682         public function getFullText() {
 683                 $text = $this->getPrefixedText();
 684                 if( '' != $this->mFragment ) {
 685                         $text .= '#' . $this->mFragment;
 686                 }
 687                 return $text;
 688         }
 689
 690         /**
 691          * Get the base name, i.e. the leftmost parts before the /
 692          * @return string Base name
 693          */
 694         public function getBaseText() {
 695                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 696                         return $this->getText();
 697                 }
 698
 699                 $parts = explode( '/', $this->getText() );
 700                 # Don't discard the real title if there's no subpage involved
 701                 if( count( $parts ) > 1 )
 702                         unset( $parts[ count( $parts ) - 1 ] );
 703                 return implode( '/', $parts );
 704         }
 705
 706         /**
 707          * Get the lowest-level subpage name, i.e. the rightmost part after /
 708          * @return string Subpage name
 709          */
 710         public function getSubpageText() {
 711                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 712                         return( $this->mTextform );
 713                 }
 714                 $parts = explode( '/', $this->mTextform );
 715                 return( $parts[ count( $parts ) - 1 ] );
 716         }
 717
 718         /**
 719          * Get a URL-encoded form of the subpage text
 720          * @return string URL-encoded subpage name
 721          */
 722         public function getSubpageUrlForm() {
 723                 $text = $this->getSubpageText();
 724                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 725                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 726                 return( $text );
 727         }
 728
 729         /**
 730          * Get a URL-encoded title (not an actual URL) including interwiki
 731          * @return string the URL-encoded form
 732          */
 733         public function getPrefixedURL() {
 734                 $s = $this->prefix( $this->mDbkeyform );
 735                 $s = str_replace( ' ', '_', $s );
 736
 737                 $s = wfUrlencode ( $s ) ;
 738
 739                 # Cleaning up URL to make it look nice -- is this safe?
 740                 $s = str_replace( '%28', '(', $s );
 741                 $s = str_replace( '%29', ')', $s );
 742
 743                 return $s;
 744         }
 745
 746         /**
 747          * Get a real URL referring to this title, with interwiki link and
 748          * fragment
 749          *
 750          * @param array $query an optional query string, not used for interwiki
 751          *   links. Can be specified as an associative array as well, e.g.,
 752          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 753          * @param string $variant language variant of url (for sr, zh..)
 754          * @return string the URL
 755          */
 756         public function getFullURL( $query = '', $variant = false ) {
 757                 global $wgContLang, $wgServer, $wgRequest;
 758
 759                 if( is_array( $query ) ) {
 760                         $query = wfArrayToCGI( $query );
 761                 }
 762
 763                 if ( '' == $this->mInterwiki ) {
 764                         $url = $this->getLocalUrl( $query, $variant );
 765
 766                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 767                         // Correct fix would be to move the prepending elsewhere.
 768                         if ($wgRequest->getVal('action') != 'render') {
 769                                 $url = $wgServer . $url;
 770                         }
 771                 } else {
 772                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 773
 774                         $namespace = wfUrlencode( $this->getNsText() );
 775                         if ( '' != $namespace ) {
 776                                 # Can this actually happen? Interwikis shouldn't be parsed.
 777                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 778                                 $namespace .= ':';
 779                         }
 780                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 781                         $url = wfAppendQuery( $url, $query );
 782                 }
 783
 784                 # Finally, add the fragment.
 785                 $url .= $this->getFragmentForURL();
 786
 787                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 788                 return $url;
 789         }
 790
 791         /**
 792          * Get a URL with no fragment or server name.  If this page is generated
 793          * with action=render, $wgServer is prepended.
 794          * @param mixed $query an optional query string; if not specified,
 795          *       $wgArticlePath will be used.  Can be specified as an associative array
 796          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 797          *   URL-escaped).
 798          * @param string $variant language variant of url (for sr, zh..)
 799          * @return string the URL
 800          */
 801         public function getLocalURL( $query = '', $variant = false ) {
 802                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 803                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 804
 805                 if( is_array( $query ) ) {
 806                         $query = wfArrayToCGI( $query );
 807                 }
 808
 809                 // internal links should point to same variant as current page (only anonymous users)
 810                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 811                         $pref = $wgContLang->getPreferredVariant(false);
 812                         if($pref != $wgContLang->getCode())
 813                                 $variant = $pref;
 814                 }
 815
 816                 if ( $this->isExternal() ) {
 817                         $url = $this->getFullURL();
 818                         if ( $query ) {
 819                                 // This is currently only used for edit section links in the
 820                                 // context of interwiki transclusion. In theory we should
 821                                 // append the query to the end of any existing query string,
 822                                 // but interwiki transclusion is already broken in that case.
 823                                 $url .= "?$query";
 824                         }
 825                 } else {
 826                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 827                         if ( $query == '' ) {
 828                                 if( $variant != false && $wgContLang->hasVariants() ) {
 829                                         if( $wgVariantArticlePath == false ) {
 830                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 831                                         } else {
 832                                                 $variantArticlePath = $wgVariantArticlePath;
 833                                         }
 834                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 835                                         $url = str_replace( '$1', $dbkey, $url  );
 836                                 } else {
 837                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 838                                 }
 839                         } else {
 840                                 global $wgActionPaths;
 841                                 $url = false;
 842                                 $matches = array();
 843                                 if( !empty( $wgActionPaths ) &&
 844                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 845                                 {
 846                                         $action = urldecode( $matches[2] );
 847                                         if( isset( $wgActionPaths[$action] ) ) {
 848                                                 $query = $matches[1];
 849                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 850                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 851                                                 if( $query != '' ) $url .= '?' . $query;
 852                                         }
 853                                 }
 854                                 if ( $url === false ) {
 855                                         if ( $query == '-' ) {
 856                                                 $query = '';
 857                                         }
 858                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 859                                 }
 860                         }
 861
 862                         // FIXME: this causes breakage in various places when we
 863                         // actually expected a local URL and end up with dupe prefixes.
 864                         if ($wgRequest->getVal('action') == 'render') {
 865                                 $url = $wgServer . $url;
 866                         }
 867                 }
 868                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 869                 return $url;
 870         }
 871
 872         /**
 873          * Get a URL that's the simplest URL that will be valid to link, locally,
 874          * to the current Title.  It includes the fragment, but does not include
 875          * the server unless action=render is used (or the link is external).  If
 876          * there's a fragment but the prefixed text is empty, we just return a link
 877          * to the fragment.
 878          *
 879          * @param array $query An associative array of key => value pairs for the
 880          *   query string.  Keys and values will be escaped.
 881          * @param string $variant Language variant of URL (for sr, zh..).  Ignored
 882          *   for external links.  Default is "false" (same variant as current page,
 883          *   for anonymous users).
 884          * @return string the URL
 885          */
 886         public function getLinkUrl( $query = array(), $variant = false ) {
 887                 if( !is_array( $query ) ) {
 888                         throw new MWException( 'Title::getLinkUrl passed a non-array for '.
 889                         '$query' );
 890                 }
 891                 if( $this->isExternal() ) {
 892                         return $this->getFullURL( $query );
 893                 } elseif( $this->getPrefixedText() === ''
 894                 and $this->getFragment() !== '' ) {
 895                         return $this->getFragmentForURL();
 896                 } else {
 897                         return $this->getLocalURL( $query, $variant )
 898                                 . $this->getFragmentForURL();
 899                 }
 900         }
 901
 902         /**
 903          * Get an HTML-escaped version of the URL form, suitable for
 904          * using in a link, without a server name or fragment
 905          * @param string $query an optional query string
 906          * @return string the URL
 907          */
 908         public function escapeLocalURL( $query = '' ) {
 909                 return htmlspecialchars( $this->getLocalURL( $query ) );
 910         }
 911
 912         /**
 913          * Get an HTML-escaped version of the URL form, suitable for
 914          * using in a link, including the server name and fragment
 915          *
 916          * @return string the URL
 917          * @param string $query an optional query string
 918          */
 919         public function escapeFullURL( $query = '' ) {
 920                 return htmlspecialchars( $this->getFullURL( $query ) );
 921         }
 922
 923         /**
 924          * Get the URL form for an internal link.
 925          * - Used in various Squid-related code, in case we have a different
 926          * internal hostname for the server from the exposed one.
 927          *
 928          * @param string $query an optional query string
 929          * @param string $variant language variant of url (for sr, zh..)
 930          * @return string the URL
 931          */
 932         public function getInternalURL( $query = '', $variant = false ) {
 933                 global $wgInternalServer;
 934                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 935                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 936                 return $url;
 937         }
 938
 939         /**
 940          * Get the edit URL for this Title
 941          * @return string the URL, or a null string if this is an
 942          *      interwiki link
 943          */
 944         public function getEditURL() {
 945                 if ( '' != $this->mInterwiki ) { return ''; }
 946                 $s = $this->getLocalURL( 'action=edit' );
 947
 948                 return $s;
 949         }
 950
 951         /**
 952          * Get the HTML-escaped displayable text form.
 953          * Used for the title field in <a> tags.
 954          * @return string the text, including any prefixes
 955          */
 956         public function getEscapedText() {
 957                 return htmlspecialchars( $this->getPrefixedText() );
 958         }
 959
 960         /**
 961          * Is this Title interwiki?
 962          * @return boolean
 963          */
 964         public function isExternal() { return ( '' != $this->mInterwiki ); }
 965
 966         /**
 967          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 968          *
 969          * @param string Action to check (default: edit)
 970          * @return bool
 971          */
 972         public function isSemiProtected( $action = 'edit' ) {
 973                 if( $this->exists() ) {
 974                         $restrictions = $this->getRestrictions( $action );
 975                         if( count( $restrictions ) > 0 ) {
 976                                 foreach( $restrictions as $restriction ) {
 977                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 978                                                 return false;
 979                                 }
 980                         } else {
 981                                 # Not protected
 982                                 return false;
 983                         }
 984                         return true;
 985                 } else {
 986                         # If it doesn't exist, it can't be protected
 987                         return false;
 988                 }
 989         }
 990
 991         /**
 992          * Does the title correspond to a protected article?
 993          * @param string $what the action the page is protected from,
 994          * by default checks move and edit
 995          * @return boolean
 996          */
 997         public function isProtected( $action = '' ) {
 998                 global $wgRestrictionLevels, $wgRestrictionTypes;
 999
1000                 # Special pages have inherent protection
1001                 if( $this->getNamespace() == NS_SPECIAL )
1002                         return true;
1003
1004                 # Check regular protection levels
1005                 foreach( $wgRestrictionTypes as $type ){
1006                         if( $action == $type || $action == '' ) {
1007                                 $r = $this->getRestrictions( $type );
1008                                 foreach( $wgRestrictionLevels as $level ) {
1009                                         if( in_array( $level, $r ) && $level != '' ) {
1010                                                 return true;
1011                                         }
1012                                 }
1013                         }
1014                 }
1015
1016                 return false;
1017         }
1018
1019         /**
1020          * Is $wgUser watching this page?
1021          * @return boolean
1022          */
1023         public function userIsWatching() {
1024                 global $wgUser;
1025
1026                 if ( is_null( $this->mWatched ) ) {
1027                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1028                                 $this->mWatched = false;
1029                         } else {
1030                                 $this->mWatched = $wgUser->isWatched( $this );
1031                         }
1032                 }
1033                 return $this->mWatched;
1034         }
1035
1036         /**
1037          * Can $wgUser perform $action on this page?
1038          * This skips potentially expensive cascading permission checks.
1039          *
1040          * Suitable for use for nonessential UI controls in common cases, but
1041          * _not_ for functional access control.
1042          *
1043          * May provide false positives, but should never provide a false negative.
1044          *
1045          * @param string $action action that permission needs to be checked for
1046          * @return boolean
1047          */
1048         public function quickUserCan( $action ) {
1049                 return $this->userCan( $action, false );
1050         }
1051
1052         /**
1053          * Determines if $wgUser is unable to edit this page because it has been protected
1054          * by $wgNamespaceProtection.
1055          *
1056          * @return boolean
1057          */
1058         public function isNamespaceProtected() {
1059                 global $wgNamespaceProtection, $wgUser;
1060                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1061                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1062                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1063                                         return true;
1064                         }
1065                 }
1066                 return false;
1067         }
1068
1069         /**
1070          * Can $wgUser perform $action on this page?
1071          * @param string $action action that permission needs to be checked for
1072          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1073          * @return boolean
1074          */
1075         public function userCan( $action, $doExpensiveQueries = true ) {
1076                 global $wgUser;
1077                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1078         }
1079
1080         /**
1081          * Can $user perform $action on this page?
1082          *
1083          * FIXME: This *does not* check throttles (User::pingLimiter()).
1084          *
1085          * @param string $action action that permission needs to be checked for
1086          * @param User $user user to check
1087          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1088          * @param array $ignoreErrors Set this to a list of message keys whose corresponding errors may be ignored.
1089          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1090          */
1091         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1092                 if( !StubObject::isRealObject( $user ) ) {
1093                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1094                         global $wgUser;
1095                         $wgUser->_unstub( '', 5 );
1096                         $user = $wgUser;
1097                 }
1098                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1099
1100                 global $wgContLang;
1101                 global $wgLang;
1102                 global $wgEmailConfirmToEdit;
1103
1104                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1105                         $errors[] = array( 'confirmedittext' );
1106                 }
1107
1108                 if ( $user->isBlockedFrom( $this ) && $action != 'createaccount' ) {
1109                         $block = $user->mBlock;
1110
1111                         // This is from OutputPage::blockedPage
1112                         // Copied at r23888 by werdna
1113
1114                         $id = $user->blockedBy();
1115                         $reason = $user->blockedFor();
1116                         if( $reason == '' ) {
1117                                 $reason = wfMsg( 'blockednoreason' );
1118                         }
1119                         $ip = wfGetIP();
1120
1121                         if ( is_numeric( $id ) ) {
1122                                 $name = User::whoIs( $id );
1123                         } else {
1124                                 $name = $id;
1125                         }
1126
1127                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1128                         $blockid = $block->mId;
1129                         $blockExpiry = $user->mBlock->mExpiry;
1130                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1131
1132                         if ( $blockExpiry == 'infinity' ) {
1133                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1134                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1135
1136                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1137                                         if ( strpos( $option, ':' ) == false )
1138                                                 continue;
1139
1140                                         list ($show, $value) = explode( ":", $option );
1141
1142                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1143                                                 $blockExpiry = $show;
1144                                                 break;
1145                                         }
1146                                 }
1147                         } else {
1148                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1149                         }
1150
1151                         $intended = $user->mBlock->mAddress;
1152
1153                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1154                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1155                 }
1156
1157                 // Remove the errors being ignored.
1158
1159                 foreach( $errors as $index => $error ) {
1160                         $error_key = is_array($error) ? $error[0] : $error;
1161
1162                         if (in_array( $error_key, $ignoreErrors )) {
1163                                 unset($errors[$index]);
1164                         }
1165                 }
1166
1167                 return $errors;
1168         }
1169
1170         /**
1171          * Can $user perform $action on this page? This is an internal function,
1172          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1173          * checks on wfReadOnly() and blocks)
1174          *
1175          * @param string $action action that permission needs to be checked for
1176          * @param User $user user to check
1177          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1178          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1179          */
1180         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1181                 wfProfileIn( __METHOD__ );
1182
1183                 $errors = array();
1184
1185                 // Use getUserPermissionsErrors instead
1186                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1187                         wfProfileOut( __METHOD__ );
1188                         return $result ? array() : array( array( 'badaccess-group0' ) );
1189                 }
1190
1191                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1192                         if ($result != array() && is_array($result) && !is_array($result[0]))
1193                                 $errors[] = $result; # A single array representing an error
1194                         else if (is_array($result) && is_array($result[0]))
1195                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1196                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1197                                 $errors[] = array($result); # A string representing a message-id
1198                         else if ($result === false )
1199                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1200                 }
1201                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1202                         if ($result != array() && is_array($result) && !is_array($result[0]))
1203                                 $errors[] = $result; # A single array representing an error
1204                         else if (is_array($result) && is_array($result[0]))
1205                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1206                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1207                                 $errors[] = array($result); # A string representing a message-id
1208                         else if ($result === false )
1209                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1210                 }
1211
1212                 $specialOKActions = array( 'createaccount', 'execute' );
1213                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1214                         $errors[] = array('ns-specialprotected');
1215                 }
1216
1217                 if ( $this->isNamespaceProtected() ) {
1218                         $ns = $this->getNamespace() == NS_MAIN
1219                                 ? wfMsg( 'nstab-main' )
1220                                 : $this->getNsText();
1221                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1222                                 ? array('protectedinterface')
1223                                 : array( 'namespaceprotected',  $ns ) );
1224                 }
1225
1226                 if( $this->mDbkeyform == '_' ) {
1227                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1228                         $errors[] = array('badaccess-group0');
1229                 }
1230
1231                 # protect css/js subpages of user pages
1232                 # XXX: this might be better using restrictions
1233                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1234                 if( $this->isCssJsSubpage()
1235                         && !$user->isAllowed('editusercssjs')
1236                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1237                         $errors[] = array('customcssjsprotected');
1238                 }
1239
1240                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1241                         # We /could/ use the protection level on the source page, but it's fairly ugly
1242                         #  as we have to establish a precedence hierarchy for pages included by multiple
1243                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1244                         #  as they could remove the protection anyway.
1245                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1246                         # Cascading protection depends on more than this page...
1247                         # Several cascading protected pages may include this page...
1248                         # Check each cascading level
1249                         # This is only for protection restrictions, not for all actions
1250                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1251                                 foreach( $restrictions[$action] as $right ) {
1252                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1253                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1254                                                 $pages = '';
1255                                                 foreach( $cascadingSources as $page )
1256                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1257                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1258                                         }
1259                                 }
1260                         }
1261                 }
1262
1263                 foreach( $this->getRestrictions($action) as $right ) {
1264                         // Backwards compatibility, rewrite sysop -> protect
1265                         if ( $right == 'sysop' ) {
1266                                 $right = 'protect';
1267                         }
1268                         if( '' != $right && !$user->isAllowed( $right ) ) {
1269                                 //Users with 'editprotected' permission can edit protected pages
1270                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1271                                         //Users with 'editprotected' permission cannot edit protected pages
1272                                         //with cascading option turned on.
1273                                         if($this->mCascadeRestriction) {
1274                                                 $errors[] = array( 'protectedpagetext', $right );
1275                                         } else {
1276                                                 //Nothing, user can edit!
1277                                         }
1278                                 } else {
1279                                         $errors[] = array( 'protectedpagetext', $right );
1280                                 }
1281                         }
1282                 }
1283
1284                 if ($action == 'protect') {
1285                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1286                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1287                         }
1288                 }
1289
1290                 if ($action == 'create') {
1291                         $title_protection = $this->getTitleProtection();
1292
1293                         if (is_array($title_protection)) {
1294                                 extract($title_protection);
1295
1296                                 if ($pt_create_perm == 'sysop')
1297                                         $pt_create_perm = 'protect';
1298
1299                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1300                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1301                                 }
1302                         }
1303
1304                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1305                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1306                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1307                         }
1308                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1309                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1310                 } elseif ( !$user->isAllowed( $action ) ) {
1311                         $return = null;
1312                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1313                                 User::getGroupsWithPermission( $action ) );
1314                         if ( $groups ) {
1315                                 $return = array( 'badaccess-groups',
1316                                         array(
1317                                                 implode( ', ', $groups ),
1318                                                 count( $groups ) ) );
1319                         }
1320                         else {
1321                                 $return = array( "badaccess-group0" );
1322                         }
1323                         $errors[] = $return;
1324                 }
1325
1326                 wfProfileOut( __METHOD__ );
1327                 return $errors;
1328         }
1329
1330         /**
1331          * Is this title subject to title protection?
1332          * @return mixed An associative array representing any existent title
1333          *   protection, or false if there's none.
1334          */
1335         private function getTitleProtection() {
1336                 // Can't protect pages in special namespaces
1337                 if ( $this->getNamespace() < 0 ) {
1338                         return false;
1339                 }
1340
1341                 $dbr = wfGetDB( DB_SLAVE );
1342                 $res = $dbr->select( 'protected_titles', '*',
1343                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1344
1345                 if ($row = $dbr->fetchRow( $res )) {
1346                         return $row;
1347                 } else {
1348                         return false;
1349                 }
1350         }
1351
1352         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1353                 global $wgUser,$wgContLang;
1354
1355                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1356                         && $expiry == $this->mRestrictionsExpiry) {
1357                         // No change
1358                         return true;
1359                 }
1360
1361                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1362
1363                 $dbw = wfGetDB( DB_MASTER );
1364
1365                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1366
1367                 $expiry_description = '';
1368                 if ( $encodedExpiry != 'infinity' ) {
1369                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1370                 }
1371
1372                 # Update protection table
1373                 if ($create_perm != '' ) {
1374                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1375                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1376                                         , 'pt_create_perm' => $create_perm
1377                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1378                                         , 'pt_expiry' => $encodedExpiry
1379                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1380                 } else {
1381                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1382                                 'pt_title' => $title ), __METHOD__ );
1383                 }
1384                 # Update the protection log
1385                 $log = new LogPage( 'protect' );
1386
1387                 if( $create_perm ) {
1388                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1389                 } else {
1390                         $log->addEntry( 'unprotect', $this, $reason );
1391                 }
1392
1393                 return true;
1394         }
1395
1396         /**
1397          * Remove any title protection (due to page existing
1398          */
1399         public function deleteTitleProtection() {
1400                 $dbw = wfGetDB( DB_MASTER );
1401
1402                 $dbw->delete( 'protected_titles',
1403                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1404         }
1405
1406         /**
1407          * Can $wgUser edit this page?
1408          * @return boolean
1409          * @deprecated use userCan('edit')
1410          */
1411         public function userCanEdit( $doExpensiveQueries = true ) {
1412                 return $this->userCan( 'edit', $doExpensiveQueries );
1413         }
1414
1415         /**
1416          * Can $wgUser create this page?
1417          * @return boolean
1418          * @deprecated use userCan('create')
1419          */
1420         public function userCanCreate( $doExpensiveQueries = true ) {
1421                 return $this->userCan( 'create', $doExpensiveQueries );
1422         }
1423
1424         /**
1425          * Can $wgUser move this page?
1426          * @return boolean
1427          * @deprecated use userCan('move')
1428          */
1429         public function userCanMove( $doExpensiveQueries = true ) {
1430                 return $this->userCan( 'move', $doExpensiveQueries );
1431         }
1432
1433         /**
1434          * Would anybody with sufficient privileges be able to move this page?
1435          * Some pages just aren't movable.
1436          *
1437          * @return boolean
1438          */
1439         public function isMovable() {
1440                 return MWNamespace::isMovable( $this->getNamespace() )
1441                         && $this->getInterwiki() == '';
1442         }
1443
1444         /**
1445          * Can $wgUser read this page?
1446          * @return boolean
1447          * @todo fold these checks into userCan()
1448          */
1449         public function userCanRead() {
1450                 global $wgUser, $wgGroupPermissions;
1451
1452                 $result = null;
1453                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1454                 if ( $result !== null ) {
1455                         return $result;
1456                 }
1457
1458                 # Shortcut for public wikis, allows skipping quite a bit of code
1459                 if ($wgGroupPermissions['*']['read'])
1460                         return true;
1461
1462                 if( $wgUser->isAllowed( 'read' ) ) {
1463                         return true;
1464                 } else {
1465                         global $wgWhitelistRead;
1466
1467                         /**
1468                          * Always grant access to the login page.
1469                          * Even anons need to be able to log in.
1470                         */
1471                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1472                                 return true;
1473                         }
1474
1475                         /**
1476                          * Bail out if there isn't whitelist
1477                          */
1478                         if( !is_array($wgWhitelistRead) ) {
1479                                 return false;
1480                         }
1481
1482                         /**
1483                          * Check for explicit whitelisting
1484                          */
1485                         $name = $this->getPrefixedText();
1486                         $dbName = $this->getPrefixedDBKey();
1487                         // Check with and without underscores
1488                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1489                                 return true;
1490
1491                         /**
1492                          * Old settings might have the title prefixed with
1493                          * a colon for main-namespace pages
1494                          */
1495                         if( $this->getNamespace() == NS_MAIN ) {
1496                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1497                                         return true;
1498                         }
1499
1500                         /**
1501                          * If it's a special page, ditch the subpage bit
1502                          * and check again
1503                          */
1504                         if( $this->getNamespace() == NS_SPECIAL ) {
1505                                 $name = $this->getDBkey();
1506                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1507                                 if ( $name === false ) {
1508                                         # Invalid special page, but we show standard login required message
1509                                         return false;
1510                                 }
1511
1512                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1513                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1514                                         return true;
1515                         }
1516
1517                 }
1518                 return false;
1519         }
1520
1521         /**
1522          * Is this a talk page of some sort?
1523          * @return bool
1524          */
1525         public function isTalkPage() {
1526                 return MWNamespace::isTalk( $this->getNamespace() );
1527         }
1528
1529         /**
1530          * Is this a subpage?
1531          * @return bool
1532          */
1533         public function isSubpage() {
1534                 return MWNamespace::hasSubpages( $this->mNamespace )
1535                         ? strpos( $this->getText(), '/' ) !== false
1536                         : false;
1537         }
1538
1539         /**
1540          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1541          * @return bool
1542          */
1543         public function hasSubpages() {
1544                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1545                         # Duh
1546                         return false;
1547                 }
1548
1549                 # We dynamically add a member variable for the purpose of this method
1550                 # alone to cache the result.  There's no point in having it hanging
1551                 # around uninitialized in every Title object; therefore we only add it
1552                 # if needed and don't declare it statically.
1553                 if( isset( $this->mHasSubpages ) ) {
1554                         return $this->mHasSubpages;
1555                 }
1556
1557                 $db = wfGetDB( DB_SLAVE );
1558                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1559                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1560                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1561                         __METHOD__
1562                 );
1563         }
1564
1565         /**
1566          * Could this page contain custom CSS or JavaScript, based
1567          * on the title?
1568          *
1569          * @return bool
1570          */
1571         public function isCssOrJsPage() {
1572                 return $this->mNamespace == NS_MEDIAWIKI
1573                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1574         }
1575
1576         /**
1577          * Is this a .css or .js subpage of a user page?
1578          * @return bool
1579          */
1580         public function isCssJsSubpage() {
1581                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1582         }
1583         /**
1584          * Is this a *valid* .css or .js subpage of a user page?
1585          * Check that the corresponding skin exists
1586          */
1587         public function isValidCssJsSubpage() {
1588                 if ( $this->isCssJsSubpage() ) {
1589                         $skinNames = Skin::getSkinNames();
1590                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1591                 } else {
1592                         return false;
1593                 }
1594         }
1595         /**
1596          * Trim down a .css or .js subpage title to get the corresponding skin name
1597          */
1598         public function getSkinFromCssJsSubpage() {
1599                 $subpage = explode( '/', $this->mTextform );
1600                 $subpage = $subpage[ count( $subpage ) - 1 ];
1601                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1602         }
1603         /**
1604          * Is this a .css subpage of a user page?
1605          * @return bool
1606          */
1607         public function isCssSubpage() {
1608                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1609         }
1610         /**
1611          * Is this a .js subpage of a user page?
1612          * @return bool
1613          */
1614         public function isJsSubpage() {
1615                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1616         }
1617         /**
1618          * Protect css/js subpages of user pages: can $wgUser edit
1619          * this page?
1620          *
1621          * @return boolean
1622          * @todo XXX: this might be better using restrictions
1623          */
1624         public function userCanEditCssJsSubpage() {
1625                 global $wgUser;
1626                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1627         }
1628
1629         /**
1630          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1631          *
1632          * @return bool If the page is subject to cascading restrictions.
1633          */
1634         public function isCascadeProtected() {
1635                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1636                 return ( $sources > 0 );
1637         }
1638
1639         /**
1640          * Cascading protection: Get the source of any cascading restrictions on this page.
1641          *
1642          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1643          * @return array( mixed title array, restriction array)
1644          * 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.
1645          * The restriction array is an array of each type, each of which contains an array of unique groups
1646          */
1647         public function getCascadeProtectionSources( $get_pages = true ) {
1648                 global $wgRestrictionTypes;
1649
1650                 # Define our dimension of restrictions types
1651                 $pagerestrictions = array();
1652                 foreach( $wgRestrictionTypes as $action )
1653                         $pagerestrictions[$action] = array();
1654
1655                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1656                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1657                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1658                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1659                 }
1660
1661                 wfProfileIn( __METHOD__ );
1662
1663                 $dbr = wfGetDb( DB_SLAVE );
1664
1665                 if ( $this->getNamespace() == NS_IMAGE ) {
1666                         $tables = array ('imagelinks', 'page_restrictions');
1667                         $where_clauses = array(
1668                                 'il_to' => $this->getDBkey(),
1669                                 'il_from=pr_page',
1670                                 'pr_cascade' => 1 );
1671                 } else {
1672                         $tables = array ('templatelinks', 'page_restrictions');
1673                         $where_clauses = array(
1674                                 'tl_namespace' => $this->getNamespace(),
1675                                 'tl_title' => $this->getDBkey(),
1676                                 'tl_from=pr_page',
1677                                 'pr_cascade' => 1 );
1678                 }
1679
1680                 if ( $get_pages ) {
1681                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1682                         $where_clauses[] = 'page_id=pr_page';
1683                         $tables[] = 'page';
1684                 } else {
1685                         $cols = array( 'pr_expiry' );
1686                 }
1687
1688                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1689
1690                 $sources = $get_pages ? array() : false;
1691                 $now = wfTimestampNow();
1692                 $purgeExpired = false;
1693
1694                 foreach( $res as $row ) {
1695                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1696                         if( $expiry > $now ) {
1697                                 if ($get_pages) {
1698                                         $page_id = $row->pr_page;
1699                                         $page_ns = $row->page_namespace;
1700                                         $page_title = $row->page_title;
1701                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1702                                         # Add groups needed for each restriction type if its not already there
1703                                         # Make sure this restriction type still exists
1704                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1705                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1706                                         }
1707                                 } else {
1708                                         $sources = true;
1709                                 }
1710                         } else {
1711                                 // Trigger lazy purge of expired restrictions from the db
1712                                 $purgeExpired = true;
1713                         }
1714                 }
1715                 if( $purgeExpired ) {
1716                         Title::purgeExpiredRestrictions();
1717                 }
1718
1719                 wfProfileOut( __METHOD__ );
1720
1721                 if ( $get_pages ) {
1722                         $this->mCascadeSources = $sources;
1723                         $this->mCascadingRestrictions = $pagerestrictions;
1724                 } else {
1725                         $this->mHasCascadingRestrictions = $sources;
1726                 }
1727
1728                 return array( $sources, $pagerestrictions );
1729         }
1730
1731         function areRestrictionsCascading() {
1732                 if (!$this->mRestrictionsLoaded) {
1733                         $this->loadRestrictions();
1734                 }
1735
1736                 return $this->mCascadeRestriction;
1737         }
1738
1739         /**
1740          * Loads a string into mRestrictions array
1741          * @param resource $res restrictions as an SQL result.
1742          */
1743         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1744                 global $wgRestrictionTypes;
1745                 $dbr = wfGetDB( DB_SLAVE );
1746
1747                 foreach( $wgRestrictionTypes as $type ){
1748                         $this->mRestrictions[$type] = array();
1749                 }
1750
1751                 $this->mCascadeRestriction = false;
1752                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1753
1754                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1755
1756                 if ( $oldFashionedRestrictions === NULL ) {
1757                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1758                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1759                 }
1760
1761                 if ($oldFashionedRestrictions != '') {
1762
1763                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1764                                 $temp = explode( '=', trim( $restrict ) );
1765                                 if(count($temp) == 1) {
1766                                         // old old format should be treated as edit/move restriction
1767                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1768                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1769                                 } else {
1770                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1771                                 }
1772                         }
1773
1774                         $this->mOldRestrictions = true;
1775
1776                 }
1777
1778                 if( $dbr->numRows( $res ) ) {
1779                         # Current system - load second to make them override.
1780                         $now = wfTimestampNow();
1781                         $purgeExpired = false;
1782
1783                         foreach( $res as $row ) {
1784                                 # Cycle through all the restrictions.
1785
1786                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1787                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1788                                         continue;
1789
1790                                 // This code should be refactored, now that it's being used more generally,
1791                                 // But I don't really see any harm in leaving it in Block for now -werdna
1792                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1793
1794                                 // Only apply the restrictions if they haven't expired!
1795                                 if ( !$expiry || $expiry > $now ) {
1796                                         $this->mRestrictionsExpiry = $expiry;
1797                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1798
1799                                         $this->mCascadeRestriction |= $row->pr_cascade;
1800                                 } else {
1801                                         // Trigger a lazy purge of expired restrictions
1802                                         $purgeExpired = true;
1803                                 }
1804                         }
1805
1806                         if( $purgeExpired ) {
1807                                 Title::purgeExpiredRestrictions();
1808                         }
1809                 }
1810
1811                 $this->mRestrictionsLoaded = true;
1812         }
1813
1814         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1815                 if( !$this->mRestrictionsLoaded ) {
1816                         if ($this->exists()) {
1817                                 $dbr = wfGetDB( DB_SLAVE );
1818
1819                                 $res = $dbr->select( 'page_restrictions', '*',
1820                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1821
1822                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1823                         } else {
1824                                 $title_protection = $this->getTitleProtection();
1825
1826                                 if (is_array($title_protection)) {
1827                                         extract($title_protection);
1828
1829                                         $now = wfTimestampNow();
1830                                         $expiry = Block::decodeExpiry($pt_expiry);
1831
1832                                         if (!$expiry || $expiry > $now) {
1833                                                 // Apply the restrictions
1834                                                 $this->mRestrictionsExpiry = $expiry;
1835                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1836                                         } else { // Get rid of the old restrictions
1837                                                 Title::purgeExpiredRestrictions();
1838                                         }
1839                                 } else {
1840                                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1841                                 }
1842                                 $this->mRestrictionsLoaded = true;
1843                         }
1844                 }
1845         }
1846
1847         /**
1848          * Purge expired restrictions from the page_restrictions table
1849          */
1850         static function purgeExpiredRestrictions() {
1851                 $dbw = wfGetDB( DB_MASTER );
1852                 $dbw->delete( 'page_restrictions',
1853                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1854                         __METHOD__ );
1855
1856                 $dbw->delete( 'protected_titles',
1857                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1858                         __METHOD__ );
1859         }
1860
1861         /**
1862          * Accessor/initialisation for mRestrictions
1863          *
1864          * @param string $action action that permission needs to be checked for
1865          * @return array the array of groups allowed to edit this article
1866          */
1867         public function getRestrictions( $action ) {
1868                 if( !$this->mRestrictionsLoaded ) {
1869                         $this->loadRestrictions();
1870                 }
1871                 return isset( $this->mRestrictions[$action] )
1872                                 ? $this->mRestrictions[$action]
1873                                 : array();
1874         }
1875
1876         /**
1877          * Is there a version of this page in the deletion archive?
1878          * @return int the number of archived revisions
1879          */
1880         public function isDeleted() {
1881                 $fname = 'Title::isDeleted';
1882                 if ( $this->getNamespace() < 0 ) {
1883                         $n = 0;
1884                 } else {
1885                         $dbr = wfGetDB( DB_SLAVE );
1886                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1887                                 'ar_title' => $this->getDBkey() ), $fname );
1888                         if( $this->getNamespace() == NS_IMAGE ) {
1889                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1890                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1891                         }
1892                 }
1893                 return (int)$n;
1894         }
1895
1896         /**
1897          * Get the article ID for this Title from the link cache,
1898          * adding it if necessary
1899          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1900          *      for update
1901          * @return int the ID
1902          */
1903         public function getArticleID( $flags = 0 ) {
1904                 $linkCache = LinkCache::singleton();
1905                 if ( $flags & GAID_FOR_UPDATE ) {
1906                         $oldUpdate = $linkCache->forUpdate( true );
1907                         $this->mArticleID = $linkCache->addLinkObj( $this );
1908                         $linkCache->forUpdate( $oldUpdate );
1909                 } else {
1910                         if ( -1 == $this->mArticleID ) {
1911                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1912                         }
1913                 }
1914                 return $this->mArticleID;
1915         }
1916
1917         /**
1918          * Is this an article that is a redirect page?
1919          * Uses link cache, adding it if necessary
1920          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1921          * @return bool
1922          */
1923         public function isRedirect( $flags = 0 ) {
1924                 if( !is_null($this->mRedirect) )
1925                         return $this->mRedirect;
1926                 # Zero for special pages.
1927                 # Also, calling getArticleID() loads the field from cache!
1928                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1929                         return false;
1930                 }
1931                 $linkCache = LinkCache::singleton();
1932                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1933
1934                 return $this->mRedirect;
1935         }
1936
1937         /**
1938          * What is the length of this page?
1939          * Uses link cache, adding it if necessary
1940          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1941          * @return bool
1942          */
1943         public function getLength( $flags = 0 ) {
1944                 if( $this->mLength != -1 )
1945                         return $this->mLength;
1946                 # Zero for special pages.
1947                 # Also, calling getArticleID() loads the field from cache!
1948                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1949                         return 0;
1950                 }
1951                 $linkCache = LinkCache::singleton();
1952                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1953
1954                 return $this->mLength;
1955         }
1956
1957         /**
1958          * What is the page_latest field for this page?
1959          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1960          * @return int
1961          */
1962         public function getLatestRevID( $flags = 0 ) {
1963                 if ($this->mLatestID !== false)
1964                         return $this->mLatestID;
1965
1966                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1967                 return $this->mLatestID = $db->selectField( 'revision',
1968                         "max(rev_id)",
1969                         array('rev_page' => $this->getArticleID($flags)),
1970                         'Title::getLatestRevID' );
1971         }
1972
1973         /**
1974          * This clears some fields in this object, and clears any associated
1975          * keys in the "bad links" section of the link cache.
1976          *
1977          * - This is called from Article::insertNewArticle() to allow
1978          * loading of the new page_id. It's also called from
1979          * Article::doDeleteArticle()
1980          *
1981          * @param int $newid the new Article ID
1982          */
1983         public function resetArticleID( $newid ) {
1984                 $linkCache = LinkCache::singleton();
1985                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1986
1987                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1988                 else { $this->mArticleID = $newid; }
1989                 $this->mRestrictionsLoaded = false;
1990                 $this->mRestrictions = array();
1991         }
1992
1993         /**
1994          * Updates page_touched for this page; called from LinksUpdate.php
1995          * @return bool true if the update succeded
1996          */
1997         public function invalidateCache() {
1998                 global $wgUseFileCache;
1999
2000                 if ( wfReadOnly() ) {
2001                         return;
2002                 }
2003
2004                 $dbw = wfGetDB( DB_MASTER );
2005                 $success = $dbw->update( 'page',
2006                         array( /* SET */
2007                                 'page_touched' => $dbw->timestamp()
2008                         ), array( /* WHERE */
2009                                 'page_namespace' => $this->getNamespace() ,
2010                                 'page_title' => $this->getDBkey()
2011                         ), 'Title::invalidateCache'
2012                 );
2013
2014                 if ($wgUseFileCache) {
2015                         $cache = new HTMLFileCache($this);
2016                         @unlink($cache->fileCacheName());
2017                 }
2018
2019                 return $success;
2020         }
2021
2022         /**
2023          * Prefix some arbitrary text with the namespace or interwiki prefix
2024          * of this object
2025          *
2026          * @param string $name the text
2027          * @return string the prefixed text
2028          * @private
2029          */
2030         /* private */ function prefix( $name ) {
2031                 $p = '';
2032                 if ( '' != $this->mInterwiki ) {
2033                         $p = $this->mInterwiki . ':';
2034                 }
2035                 if ( 0 != $this->mNamespace ) {
2036                         $p .= $this->getNsText() . ':';
2037                 }
2038                 return $p . $name;
2039         }
2040
2041         /**
2042          * Secure and split - main initialisation function for this object
2043          *
2044          * Assumes that mDbkeyform has been set, and is urldecoded
2045          * and uses underscores, but not otherwise munged.  This function
2046          * removes illegal characters, splits off the interwiki and
2047          * namespace prefixes, sets the other forms, and canonicalizes
2048          * everything.
2049          * @return bool true on success
2050          */
2051         private function secureAndSplit() {
2052                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2053
2054                 # Initialisation
2055                 static $rxTc = false;
2056                 if( !$rxTc ) {
2057                         # Matching titles will be held as illegal.
2058                         $rxTc = '/' .
2059                                 # Any character not allowed is forbidden...
2060                                 '[^' . Title::legalChars() . ']' .
2061                                 # URL percent encoding sequences interfere with the ability
2062                                 # to round-trip titles -- you can't link to them consistently.
2063                                 '|%[0-9A-Fa-f]{2}' .
2064                                 # XML/HTML character references produce similar issues.
2065                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2066                                 '|&#[0-9]+;' .
2067                                 '|&#x[0-9A-Fa-f]+;' .
2068                                 '/S';
2069                 }
2070
2071                 $this->mInterwiki = $this->mFragment = '';
2072                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2073
2074                 $dbkey = $this->mDbkeyform;
2075
2076                 # Strip Unicode bidi override characters.
2077                 # Sometimes they slip into cut-n-pasted page titles, where the
2078                 # override chars get included in list displays.
2079                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
2080                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
2081
2082                 # Clean up whitespace
2083                 #
2084                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2085                 $dbkey = trim( $dbkey, '_' );
2086
2087                 if ( '' == $dbkey ) {
2088                         return false;
2089                 }
2090
2091                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2092                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2093                         return false;
2094                 }
2095
2096                 $this->mDbkeyform = $dbkey;
2097
2098                 # Initial colon indicates main namespace rather than specified default
2099                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2100                 if ( ':' == $dbkey{0} ) {
2101                         $this->mNamespace = NS_MAIN;
2102                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2103                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2104                 }
2105
2106                 # Namespace or interwiki prefix
2107                 $firstPass = true;
2108                 do {
2109                         $m = array();
2110                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
2111                                 $p = $m[1];
2112                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
2113                                         # Ordinary namespace
2114                                         $dbkey = $m[2];
2115                                         $this->mNamespace = $ns;
2116                                 } elseif( $this->getInterwikiLink( $p ) ) {
2117                                         if( !$firstPass ) {
2118                                                 # Can't make a local interwiki link to an interwiki link.
2119                                                 # That's just crazy!
2120                                                 return false;
2121                                         }
2122
2123                                         # Interwiki link
2124                                         $dbkey = $m[2];
2125                                         $this->mInterwiki = $wgContLang->lc( $p );
2126
2127                                         # Redundant interwiki prefix to the local wiki
2128                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2129                                                 if( $dbkey == '' ) {
2130                                                         # Can't have an empty self-link
2131                                                         return false;
2132                                                 }
2133                                                 $this->mInterwiki = '';
2134                                                 $firstPass = false;
2135                                                 # Do another namespace split...
2136                                                 continue;
2137                                         }
2138
2139                                         # If there's an initial colon after the interwiki, that also
2140                                         # resets the default namespace
2141                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2142                                                 $this->mNamespace = NS_MAIN;
2143                                                 $dbkey = substr( $dbkey, 1 );
2144                                         }
2145                                 }
2146                                 # If there's no recognized interwiki or namespace,
2147                                 # then let the colon expression be part of the title.
2148                         }
2149                         break;
2150                 } while( true );
2151
2152                 # We already know that some pages won't be in the database!
2153                 #
2154                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2155                         $this->mArticleID = 0;
2156                 }
2157                 $fragment = strstr( $dbkey, '#' );
2158                 if ( false !== $fragment ) {
2159                         $this->setFragment( $fragment );
2160                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2161                         # remove whitespace again: prevents "Foo_bar_#"
2162                         # becoming "Foo_bar_"
2163                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2164                 }
2165
2166                 # Reject illegal characters.
2167                 #
2168                 if( preg_match( $rxTc, $dbkey ) ) {
2169                         return false;
2170                 }
2171
2172                 /**
2173                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2174                  * reachable due to the way web browsers deal with 'relative' URLs.
2175                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2176                  */
2177                 if ( strpos( $dbkey, '.' ) !== false &&
2178                      ( $dbkey === '.' || $dbkey === '..' ||
2179                        strpos( $dbkey, './' ) === 0  ||
2180                        strpos( $dbkey, '../' ) === 0 ||
2181                        strpos( $dbkey, '/./' ) !== false ||
2182                        strpos( $dbkey, '/../' ) !== false  ||
2183                        substr( $dbkey, -2 ) == '/.' ||
2184                        substr( $dbkey, -3 ) == '/..' ) )
2185                 {
2186                         return false;
2187                 }
2188
2189                 /**
2190                  * Magic tilde sequences? Nu-uh!
2191                  */
2192                 if( strpos( $dbkey, '~~~' ) !== false ) {
2193                         return false;
2194                 }
2195
2196                 /**
2197                  * Limit the size of titles to 255 bytes.
2198                  * This is typically the size of the underlying database field.
2199                  * We make an exception for special pages, which don't need to be stored
2200                  * in the database, and may edge over 255 bytes due to subpage syntax
2201                  * for long titles, e.g. [[Special:Block/Long name]]
2202                  */
2203                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2204                   strlen( $dbkey ) > 512 )
2205                 {
2206                         return false;
2207                 }
2208
2209                 /**
2210                  * Normally, all wiki links are forced to have
2211                  * an initial capital letter so [[foo]] and [[Foo]]
2212                  * point to the same place.
2213                  *
2214                  * Don't force it for interwikis, since the other
2215                  * site might be case-sensitive.
2216                  */
2217                 $this->mUserCaseDBKey = $dbkey;
2218                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2219                         $dbkey = $wgContLang->ucfirst( $dbkey );
2220                 }
2221
2222                 /**
2223                  * Can't make a link to a namespace alone...
2224                  * "empty" local links can only be self-links
2225                  * with a fragment identifier.
2226                  */
2227                 if( $dbkey == '' &&
2228                         $this->mInterwiki == '' &&
2229                         $this->mNamespace != NS_MAIN ) {
2230                         return false;
2231                 }
2232                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2233                 // IP names are not allowed for accounts, and can only be referring to
2234                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2235                 // there are numerous ways to present the same IP. Having sp:contribs scan
2236                 // them all is silly and having some show the edits and others not is
2237                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2238                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2239                         IP::sanitizeIP( $dbkey ) : $dbkey;
2240                 // Any remaining initial :s are illegal.
2241                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2242                         return false;
2243                 }
2244
2245                 # Fill fields
2246                 $this->mDbkeyform = $dbkey;
2247                 $this->mUrlform = wfUrlencode( $dbkey );
2248
2249                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2250
2251                 return true;
2252         }
2253
2254         /**
2255          * Set the fragment for this title
2256          * This is kind of bad, since except for this rarely-used function, Title objects
2257          * are immutable. The reason this is here is because it's better than setting the
2258          * members directly, which is what Linker::formatComment was doing previously.
2259          *
2260          * @param string $fragment text
2261          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2262          */
2263         public function setFragment( $fragment ) {
2264                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2265         }
2266
2267         /**
2268          * Get a Title object associated with the talk page of this article
2269          * @return Title the object for the talk page
2270          */
2271         public function getTalkPage() {
2272                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2273         }
2274
2275         /**
2276          * Get a title object associated with the subject page of this
2277          * talk page
2278          *
2279          * @return Title the object for the subject page
2280          */
2281         public function getSubjectPage() {
2282                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2283         }
2284
2285         /**
2286          * Get an array of Title objects linking to this Title
2287          * Also stores the IDs in the link cache.
2288          *
2289          * WARNING: do not use this function on arbitrary user-supplied titles!
2290          * On heavily-used templates it will max out the memory.
2291          *
2292          * @param string $options may be FOR UPDATE
2293          * @return array the Title objects linking here
2294          */
2295         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2296                 $linkCache = LinkCache::singleton();
2297
2298                 if ( $options ) {
2299                         $db = wfGetDB( DB_MASTER );
2300                 } else {
2301                         $db = wfGetDB( DB_SLAVE );
2302                 }
2303
2304                 $res = $db->select( array( 'page', $table ),
2305                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2306                         array(
2307                                 "{$prefix}_from=page_id",
2308                                 "{$prefix}_namespace" => $this->getNamespace(),
2309                                 "{$prefix}_title"     => $this->getDBkey() ),
2310                         __METHOD__,
2311                         $options );
2312
2313                 $retVal = array();
2314                 if ( $db->numRows( $res ) ) {
2315                         foreach( $res as $row ) {
2316                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2317                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2318                                         $retVal[] = $titleObj;
2319                                 }
2320                         }
2321                 }
2322                 $db->freeResult( $res );
2323                 return $retVal;
2324         }
2325
2326         /**
2327          * Get an array of Title objects using this Title as a template
2328          * Also stores the IDs in the link cache.
2329          *
2330          * WARNING: do not use this function on arbitrary user-supplied titles!
2331          * On heavily-used templates it will max out the memory.
2332          *
2333          * @param string $options may be FOR UPDATE
2334          * @return array the Title objects linking here
2335          */
2336         public function getTemplateLinksTo( $options = '' ) {
2337                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2338         }
2339
2340         /**
2341          * Get an array of Title objects referring to non-existent articles linked from this page
2342          *
2343          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2344          * @param string $options may be FOR UPDATE
2345          * @return array the Title objects
2346          */
2347         public function getBrokenLinksFrom( $options = '' ) {
2348                 if ( $this->getArticleId() == 0 ) {
2349                         # All links from article ID 0 are false positives
2350                         return array();
2351                 }
2352
2353                 if ( $options ) {
2354                         $db = wfGetDB( DB_MASTER );
2355                 } else {
2356                         $db = wfGetDB( DB_SLAVE );
2357                 }
2358
2359                 $res = $db->safeQuery(
2360                           "SELECT pl_namespace, pl_title
2361                              FROM !
2362                         LEFT JOIN !
2363                                ON pl_namespace=page_namespace
2364                               AND pl_title=page_title
2365                             WHERE pl_from=?
2366                               AND page_namespace IS NULL
2367                                   !",
2368                         $db->tableName( 'pagelinks' ),
2369                         $db->tableName( 'page' ),
2370                         $this->getArticleId(),
2371                         $options );
2372
2373                 $retVal = array();
2374                 if ( $db->numRows( $res ) ) {
2375                         foreach( $res as $row ) {
2376                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2377                         }
2378                 }
2379                 $db->freeResult( $res );
2380                 return $retVal;
2381         }
2382
2383
2384         /**
2385          * Get a list of URLs to purge from the Squid cache when this
2386          * page changes
2387          *
2388          * @return array the URLs
2389          */
2390         public function getSquidURLs() {
2391                 global $wgContLang;
2392
2393                 $urls = array(
2394                         $this->getInternalURL(),
2395                         $this->getInternalURL( 'action=history' )
2396                 );
2397
2398                 // purge variant urls as well
2399                 if($wgContLang->hasVariants()){
2400                         $variants = $wgContLang->getVariants();
2401                         foreach($variants as $vCode){
2402                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2403                                 $urls[] = $this->getInternalURL('',$vCode);
2404                         }
2405                 }
2406
2407                 return $urls;
2408         }
2409
2410         public function purgeSquid() {
2411                 global $wgUseSquid;
2412                 if ( $wgUseSquid ) {
2413                         $urls = $this->getSquidURLs();
2414                         $u = new SquidUpdate( $urls );
2415                         $u->doUpdate();
2416                 }
2417         }
2418
2419         /**
2420          * Move this page without authentication
2421          * @param Title &$nt the new page Title
2422          */
2423         public function moveNoAuth( &$nt ) {
2424                 return $this->moveTo( $nt, false );
2425         }
2426
2427         /**
2428          * Check whether a given move operation would be valid.
2429          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2430          * @param Title &$nt the new title
2431          * @param bool $auth indicates whether $wgUser's permissions
2432          *      should be checked
2433          * @param string $reason is the log summary of the move, used for spam checking
2434          * @return mixed True on success, getUserPermissionsErrors()-like array on failure
2435          */
2436         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2437                 $errors = array();
2438                 if( !$nt ) {
2439                         // Normally we'd add this to $errors, but we'll get
2440                         // lots of syntax errors if $nt is not an object
2441                         return array(array('badtitletext'));
2442                 }
2443                 if( $this->equals( $nt ) ) {
2444                         $errors[] = array('selfmove');
2445                 }
2446                 if( !$this->isMovable() || !$nt->isMovable() ) {
2447                         $errors[] = array('immobile_namespace');
2448                 }
2449
2450                 $oldid = $this->getArticleID();
2451                 $newid = $nt->getArticleID();
2452
2453                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2454                         $errors[] = array('articleexists');
2455                 }
2456                 if ( ( '' == $this->getDBkey() ) ||
2457                          ( !$oldid ) ||
2458                      ( '' == $nt->getDBkey() ) ) {
2459                         $errors[] = array('badarticleerror');
2460                 }
2461
2462                 // Image-specific checks
2463                 if( $this->getNamespace() == NS_IMAGE ) {
2464                         $file = wfLocalFile( $this );
2465                         if( $file->exists() ) {
2466                                 if( $nt->getNamespace() != NS_IMAGE ) {
2467                                         $errors[] = array('imagenocrossnamespace');
2468                                 }
2469                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2470                                         $errors[] = array('imageinvalidfilename');
2471                                 }
2472                                 if( !File::checkExtensionCompatibility( $file, $nt->getDbKey() ) ) {
2473                                         $errors[] = array('imagetypemismatch');
2474                                 }
2475                         }
2476                 }
2477
2478                 if ( $auth ) {
2479                         global $wgUser;
2480                         $errors = array_merge($errors,
2481                                         $this->getUserPermissionsErrors('move', $wgUser),
2482                                         $this->getUserPermissionsErrors('edit', $wgUser),
2483                                         $nt->getUserPermissionsErrors('move', $wgUser),
2484                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2485                 }
2486
2487                 global $wgUser;
2488                 $err = null;
2489                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2490                         $errors[] = array('hookaborted', $err);
2491                 }
2492
2493                 # The move is allowed only if (1) the target doesn't exist, or
2494                 # (2) the target is a redirect to the source, and has no history
2495                 # (so we can undo bad moves right after they're done).
2496
2497                 if ( 0 != $newid ) { # Target exists; check for validity
2498                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2499                                 $errors[] = array('articleexists');
2500                         }
2501                 } else {
2502                         $tp = $nt->getTitleProtection();
2503                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2504                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2505                                 $errors[] = array('cantmove-titleprotected');
2506                         }
2507                 }
2508                 if(empty($errors))
2509                         return true;
2510                 return $errors;
2511         }
2512
2513         /**
2514          * Move a title to a new location
2515          * @param Title &$nt the new title
2516          * @param bool $auth indicates whether $wgUser's permissions
2517          *      should be checked
2518          * @param string $reason The reason for the move
2519          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2520          *  Ignored if the user doesn't have the suppressredirect right.
2521          * @return mixed true on success, getUserPermissionsErrors()-like array on failure
2522          */
2523         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2524                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2525                 if( is_array( $err ) ) {
2526                         return $err;
2527                 }
2528
2529                 $pageid = $this->getArticleID();
2530                 if( $nt->exists() ) {
2531                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2532                         $pageCountChange = ($createRedirect ? 0 : -1);
2533                 } else { # Target didn't exist, do normal move.
2534                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2535                         $pageCountChange = ($createRedirect ? 1 : 0);
2536                 }
2537
2538                 if( is_array( $err ) ) {
2539                         return $err;
2540                 }
2541                 $redirid = $this->getArticleID();
2542
2543                 // Category memberships include a sort key which may be customized.
2544                 // If it's left as the default (the page title), we need to update
2545                 // the sort key to match the new title.
2546                 //
2547                 // Be careful to avoid resetting cl_timestamp, which may disturb
2548                 // time-based lists on some sites.
2549                 //
2550                 // Warning -- if the sort key is *explicitly* set to the old title,
2551                 // we can't actually distinguish it from a default here, and it'll
2552                 // be set to the new title even though it really shouldn't.
2553                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2554                 $dbw = wfGetDB( DB_MASTER );
2555                 $dbw->update( 'categorylinks',
2556                         array(
2557                                 'cl_sortkey' => $nt->getPrefixedText(),
2558                                 'cl_timestamp=cl_timestamp' ),
2559                         array(
2560                                 'cl_from' => $pageid,
2561                                 'cl_sortkey' => $this->getPrefixedText() ),
2562                         __METHOD__ );
2563
2564                 # Update watchlists
2565
2566                 $oldnamespace = $this->getNamespace() & ~1;
2567                 $newnamespace = $nt->getNamespace() & ~1;
2568                 $oldtitle = $this->getDBkey();
2569                 $newtitle = $nt->getDBkey();
2570
2571                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2572                         WatchedItem::duplicateEntries( $this, $nt );
2573                 }
2574
2575                 # Update search engine
2576                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2577                 $u->doUpdate();
2578                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2579                 $u->doUpdate();
2580
2581                 # Update site_stats
2582                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2583                         # No longer a content page
2584                         # Not viewed, edited, removing
2585                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2586                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2587                         # Now a content page
2588                         # Not viewed, edited, adding
2589                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2590                 } elseif( $pageCountChange ) {
2591                         # Redirect added
2592                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2593                 } else {
2594                         # Nothing special
2595                         $u = false;
2596                 }
2597                 if( $u )
2598                         $u->doUpdate();
2599                 # Update message cache for interface messages
2600                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2601                         global $wgMessageCache;
2602                         $oldarticle = new Article( $this );
2603                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2604                         $newarticle = new Article( $nt );
2605                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2606                 }
2607
2608                 global $wgUser;
2609                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2610                 return true;
2611         }
2612
2613         /**
2614          * Move page to a title which is at present a redirect to the
2615          * source page
2616          *
2617          * @param Title &$nt the page to move to, which should currently
2618          *      be a redirect
2619          * @param string $reason The reason for the move
2620          * @param bool $createRedirect Whether to leave a redirect at the old title.
2621          *  Ignored if the user doesn't have the suppressredirect right
2622          */
2623         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2624                 global $wgUseSquid, $wgUser;
2625                 $fname = 'Title::moveOverExistingRedirect';
2626                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2627
2628                 if ( $reason ) {
2629                         $comment .= ": $reason";
2630                 }
2631
2632                 $now = wfTimestampNow();
2633                 $newid = $nt->getArticleID();
2634                 $oldid = $this->getArticleID();
2635                 $latest = $this->getLatestRevID();
2636
2637                 $dbw = wfGetDB( DB_MASTER );
2638                 $dbw->begin();
2639
2640                 # Delete the old redirect. We don't save it to history since
2641                 # by definition if we've got here it's rather uninteresting.
2642                 # We have to remove it so that the next step doesn't trigger
2643                 # a conflict on the unique namespace+title index...
2644                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2645                 if ( !$dbw->cascadingDeletes() ) {
2646                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2647                         global $wgUseTrackbacks;
2648                         if ($wgUseTrackbacks)
2649                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2650                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2651                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2652                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2653                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2654                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2655                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2656                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2657                 }
2658
2659                 # Save a null revision in the page's history notifying of the move
2660                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2661                 $nullRevId = $nullRevision->insertOn( $dbw );
2662
2663                 $article = new Article( $this );
2664                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2665
2666                 # Change the name of the target page:
2667                 $dbw->update( 'page',
2668                         /* SET */ array(
2669                                 'page_touched'   => $dbw->timestamp($now),
2670                                 'page_namespace' => $nt->getNamespace(),
2671                                 'page_title'     => $nt->getDBkey(),
2672                                 'page_latest'    => $nullRevId,
2673                         ),
2674                         /* WHERE */ array( 'page_id' => $oldid ),
2675                         $fname
2676                 );
2677                 $nt->resetArticleID( $oldid );
2678
2679                 # Recreate the redirect, this time in the other direction.
2680                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2681                         $mwRedir = MagicWord::get( 'redirect' );
2682                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2683                         $redirectArticle = new Article( $this );
2684                         $newid = $redirectArticle->insertOn( $dbw );
2685                         $redirectRevision = new Revision( array(
2686                                 'page'    => $newid,
2687                                 'comment' => $comment,
2688                                 'text'    => $redirectText ) );
2689                         $redirectRevision->insertOn( $dbw );
2690                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2691
2692                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2693
2694                         # Now, we record the link from the redirect to the new title.
2695                         # It should have no other outgoing links...
2696                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2697                         $dbw->insert( 'pagelinks',
2698                                 array(
2699                                         'pl_from'      => $newid,
2700                                         'pl_namespace' => $nt->getNamespace(),
2701                                         'pl_title'     => $nt->getDBkey() ),
2702                                 $fname );
2703                 } else {
2704                         $this->resetArticleID( 0 );
2705                 }
2706
2707                 # Move an image if this is a file
2708                 if( $this->getNamespace() == NS_IMAGE ) {
2709                         $file = wfLocalFile( $this );
2710                         if( $file->exists() ) {
2711                                 $status = $file->move( $nt );
2712                                 if( !$status->isOk() ) {
2713                                         $dbw->rollback();
2714                                         return $status->getErrorsArray();
2715                                 }
2716                         }
2717                 }
2718                 $dbw->commit();
2719
2720                 # Log the move
2721                 $log = new LogPage( 'move' );
2722                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2723
2724                 # Purge squid
2725                 if ( $wgUseSquid ) {
2726                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2727                         $u = new SquidUpdate( $urls );
2728                         $u->doUpdate();
2729                 }
2730
2731         }
2732
2733         /**
2734          * Move page to non-existing title.
2735          * @param Title &$nt the new Title
2736          * @param string $reason The reason for the move
2737          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2738          *  Ignored if the user doesn't have the suppressredirect right
2739          */
2740         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2741                 global $wgUseSquid, $wgUser;
2742                 $fname = 'MovePageForm::moveToNewTitle';
2743                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2744                 if ( $reason ) {
2745                         $comment .= ": $reason";
2746                 }
2747
2748                 $newid = $nt->getArticleID();
2749                 $oldid = $this->getArticleID();
2750                 $latest = $this->getLatestRevId();
2751
2752                 $dbw = wfGetDB( DB_MASTER );
2753                 $dbw->begin();
2754                 $now = $dbw->timestamp();
2755
2756                 # Save a null revision in the page's history notifying of the move
2757                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2758                 $nullRevId = $nullRevision->insertOn( $dbw );
2759
2760                 $article = new Article( $this );
2761                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2762
2763                 # Rename page entry
2764                 $dbw->update( 'page',
2765                         /* SET */ array(
2766                                 'page_touched'   => $now,
2767                                 'page_namespace' => $nt->getNamespace(),
2768                                 'page_title'     => $nt->getDBkey(),
2769                                 'page_latest'    => $nullRevId,
2770                         ),
2771                         /* WHERE */ array( 'page_id' => $oldid ),
2772                         $fname
2773                 );
2774                 $nt->resetArticleID( $oldid );
2775
2776                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2777                         # Insert redirect
2778                         $mwRedir = MagicWord::get( 'redirect' );
2779                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2780                         $redirectArticle = new Article( $this );
2781                         $newid = $redirectArticle->insertOn( $dbw );
2782                         $redirectRevision = new Revision( array(
2783                                 'page'    => $newid,
2784                                 'comment' => $comment,
2785                                 'text'    => $redirectText ) );
2786                         $redirectRevision->insertOn( $dbw );
2787                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2788
2789                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2790
2791                         # Record the just-created redirect's linking to the page
2792                         $dbw->insert( 'pagelinks',
2793                                 array(
2794                                         'pl_from'      => $newid,
2795                                         'pl_namespace' => $nt->getNamespace(),
2796                                         'pl_title'     => $nt->getDBkey() ),
2797                                 $fname );
2798                 } else {
2799                         $this->resetArticleID( 0 );
2800                 }
2801
2802                 # Move an image if this is a file
2803                 if( $this->getNamespace() == NS_IMAGE ) {
2804                         $file = wfLocalFile( $this );
2805                         if( $file->exists() ) {
2806                                 $status = $file->move( $nt );
2807                                 if( !$status->isOk() ) {
2808                                         $dbw->rollback();
2809                                         return $status->getErrorsArray();
2810                                 }
2811                         }
2812                 }
2813                 $dbw->commit();
2814
2815                 # Log the move
2816                 $log = new LogPage( 'move' );
2817                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2818
2819                 # Purge caches as per article creation
2820                 Article::onArticleCreate( $nt );
2821
2822                 # Purge old title from squid
2823                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2824                 $this->purgeSquid();
2825
2826         }
2827
2828         /**
2829          * Checks if $this can be moved to a given Title
2830          * - Selects for update, so don't call it unless you mean business
2831          *
2832          * @param Title &$nt the new title to check
2833          */
2834         public function isValidMoveTarget( $nt ) {
2835
2836                 $fname = 'Title::isValidMoveTarget';
2837                 $dbw = wfGetDB( DB_MASTER );
2838
2839                 # Is it an existsing file?
2840                 if( $nt->getNamespace() == NS_IMAGE ) {
2841                         $file = wfLocalFile( $nt );
2842                         if( $file->exists() ) {
2843                                 wfDebug( __METHOD__ . ": file exists\n" );
2844                                 return false;
2845                         }
2846                 }
2847
2848                 # Is it a redirect?
2849                 $id  = $nt->getArticleID();
2850                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2851                         array( 'page_is_redirect','old_text','old_flags' ),
2852                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2853                         $fname, 'FOR UPDATE' );
2854
2855                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2856                         # Not a redirect
2857                         wfDebug( __METHOD__ . ": not a redirect\n" );
2858                         return false;
2859                 }
2860                 $text = Revision::getRevisionText( $obj );
2861
2862                 # Does the redirect point to the source?
2863                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2864                 $m = array();
2865                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2866                         $redirTitle = Title::newFromText( $m[1] );
2867                         if( !is_object( $redirTitle ) ||
2868                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2869                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2870                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2871                                 return false;
2872                         }
2873                 } else {
2874                         # Fail safe
2875                         wfDebug( __METHOD__ . ": failsafe\n" );
2876                         return false;
2877                 }
2878
2879                 # Does the article have a history?
2880                 $row = $dbw->selectRow( array( 'page', 'revision'),
2881                         array( 'rev_id' ),
2882                         array( 'page_namespace' => $nt->getNamespace(),
2883                                 'page_title' => $nt->getDBkey(),
2884                                 'page_id=rev_page AND page_latest != rev_id'
2885                         ), $fname, 'FOR UPDATE'
2886                 );
2887
2888                 # Return true if there was no history
2889                 return $row === false;
2890         }
2891
2892         /**
2893          * Can this title be added to a user's watchlist?
2894          *
2895          * @return bool
2896          */
2897         public function isWatchable() {
2898                 return !$this->isExternal()
2899                         && MWNamespace::isWatchable( $this->getNamespace() );
2900         }
2901
2902         /**
2903          * Get categories to which this Title belongs and return an array of
2904          * categories' names.
2905          *
2906          * @return array an array of parents in the form:
2907          *      $parent => $currentarticle
2908          */
2909         public function getParentCategories() {
2910                 global $wgContLang;
2911
2912                 $titlekey = $this->getArticleId();
2913                 $dbr = wfGetDB( DB_SLAVE );
2914                 $categorylinks = $dbr->tableName( 'categorylinks' );
2915
2916                 # NEW SQL
2917                 $sql = "SELECT * FROM $categorylinks"
2918                      ." WHERE cl_from='$titlekey'"
2919                          ." AND cl_from <> '0'"
2920                          ." ORDER BY cl_sortkey";
2921
2922                 $res = $dbr->query( $sql );
2923
2924                 if( $dbr->numRows( $res ) > 0 ) {
2925                         foreach( $res as $row )
2926                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
2927                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
2928                         $dbr->freeResult( $res );
2929                 } else {
2930                         $data = array();
2931                 }
2932                 return $data;
2933         }
2934
2935         /**
2936          * Get a tree of parent categories
2937          * @param array $children an array with the children in the keys, to check for circular refs
2938          * @return array
2939          */
2940         public function getParentCategoryTree( $children = array() ) {
2941                 $stack = array();
2942                 $parents = $this->getParentCategories();
2943
2944                 if( $parents ) {
2945                         foreach( $parents as $parent => $current ) {
2946                                 if ( array_key_exists( $parent, $children ) ) {
2947                                         # Circular reference
2948                                         $stack[$parent] = array();
2949                                 } else {
2950                                         $nt = Title::newFromText($parent);
2951                                         if ( $nt ) {
2952                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2953                                         }
2954                                 }
2955                         }
2956                         return $stack;
2957                 } else {
2958                         return array();
2959                 }
2960         }
2961
2962
2963         /**
2964          * Get an associative array for selecting this title from
2965          * the "page" table
2966          *
2967          * @return array
2968          */
2969         public function pageCond() {
2970                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2971         }
2972
2973         /**
2974          * Get the revision ID of the previous revision
2975          *
2976          * @param integer $revId Revision ID. Get the revision that was before this one.
2977          * @param integer $flags, GAID_FOR_UPDATE
2978          * @return integer $oldrevision|false
2979          */
2980         public function getPreviousRevisionID( $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 DESC' )
2989                 );
2990         }
2991
2992         /**
2993          * Get the revision ID of the next revision
2994          *
2995          * @param integer $revId Revision ID. Get the revision that was after this one.
2996          * @param integer $flags, GAID_FOR_UPDATE
2997          * @return integer $oldrevision|false
2998          */
2999         public function getNextRevisionID( $revId, $flags=0 ) {
3000                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3001                 return $db->selectField( 'revision', 'rev_id',
3002                         array(
3003                                 'rev_page' => $this->getArticleId($flags),
3004                                 'rev_id > ' . intval( $revId )
3005                         ),
3006                         __METHOD__,
3007                         array( 'ORDER BY' => 'rev_id' )
3008                 );
3009         }
3010
3011         /**
3012          * Get the number of revisions between the given revision IDs.
3013          * Used for diffs and other things that really need it.
3014          *
3015          * @param integer $old  Revision ID.
3016          * @param integer $new  Revision ID.
3017          * @return integer  Number of revisions between these IDs.
3018          */
3019         public function countRevisionsBetween( $old, $new ) {
3020                 $dbr = wfGetDB( DB_SLAVE );
3021                 return $dbr->selectField( 'revision', 'count(*)',
3022                         'rev_page = ' . intval( $this->getArticleId() ) .
3023                         ' AND rev_id > ' . intval( $old ) .
3024                         ' AND rev_id < ' . intval( $new ),
3025                         __METHOD__,
3026                         array( 'USE INDEX' => 'PRIMARY' ) );
3027         }
3028
3029         /**
3030          * Compare with another title.
3031          *
3032          * @param Title $title
3033          * @return bool
3034          */
3035         public function equals( Title $title ) {
3036                 // Note: === is necessary for proper matching of number-like titles.
3037                 return $this->getInterwiki() === $title->getInterwiki()
3038                         && $this->getNamespace() == $title->getNamespace()
3039                         && $this->getDBkey() === $title->getDBkey();
3040         }
3041
3042         /**
3043          * Callback for usort() to do title sorts by (namespace, title)
3044          */
3045         static function compare( $a, $b ) {
3046                 if( $a->getNamespace() == $b->getNamespace() ) {
3047                         return strcmp( $a->getText(), $b->getText() );
3048                 } else {
3049                         return $a->getNamespace() - $b->getNamespace();
3050                 }
3051         }
3052
3053         /**
3054          * Return a string representation of this title
3055          *
3056          * @return string
3057          */
3058         public function __toString() {
3059                 return $this->getPrefixedText();
3060         }
3061
3062         /**
3063          * Check if page exists
3064          * @return bool
3065          */
3066         public function exists() {
3067                 return $this->getArticleId() != 0;
3068         }
3069
3070         /**
3071          * Do we know that this title definitely exists, or should we otherwise
3072          * consider that it exists?
3073          *
3074          * @return bool
3075          */
3076         public function isAlwaysKnown() {
3077                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3078                 // the full l10n of that language to be loaded. That takes much memory and
3079                 // isn't needed. So we strip the language part away.
3080                 // Also, extension messages which are not loaded, are shown as red, because
3081                 // we don't call MessageCache::loadAllMessages.
3082                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3083                 return $this->isExternal()
3084                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
3085                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
3086         }
3087
3088         /**
3089          * Update page_touched timestamps and send squid purge messages for
3090          * pages linking to this title. May be sent to the job queue depending
3091          * on the number of links. Typically called on create and delete.
3092          */
3093         public function touchLinks() {
3094                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3095                 $u->doUpdate();
3096
3097                 if ( $this->getNamespace() == NS_CATEGORY ) {
3098                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3099                         $u->doUpdate();
3100                 }
3101         }
3102
3103         /**
3104          * Get the last touched timestamp
3105          */
3106         public function getTouched() {
3107                 $dbr = wfGetDB( DB_SLAVE );
3108                 $touched = $dbr->selectField( 'page', 'page_touched',
3109                         array(
3110                                 'page_namespace' => $this->getNamespace(),
3111                                 'page_title' => $this->getDBkey()
3112                         ), __METHOD__
3113                 );
3114                 return $touched;
3115         }
3116
3117         public function trackbackURL() {
3118                 global $wgTitle, $wgScriptPath, $wgServer;
3119
3120                 return "$wgServer$wgScriptPath/trackback.php?article="
3121                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
3122         }
3123
3124         public function trackbackRDF() {
3125                 $url = htmlspecialchars($this->getFullURL());
3126                 $title = htmlspecialchars($this->getText());
3127                 $tburl = $this->trackbackURL();
3128
3129                 // Autodiscovery RDF is placed in comments so HTML validator
3130                 // won't barf. This is a rather icky workaround, but seems
3131                 // frequently used by this kind of RDF thingy.
3132                 //
3133                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3134                 return "<!--
3135 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3136          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3137          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3138 <rdf:Description
3139    rdf:about=\"$url\"
3140    dc:identifier=\"$url\"
3141    dc:title=\"$title\"
3142    trackback:ping=\"$tburl\" />
3143 </rdf:RDF>
3144 -->";
3145         }
3146
3147         /**
3148          * Generate strings used for xml 'id' names in monobook tabs
3149          * @return string
3150          */
3151         public function getNamespaceKey() {
3152                 global $wgContLang;
3153                 switch ($this->getNamespace()) {
3154                         case NS_MAIN:
3155                         case NS_TALK:
3156                                 return 'nstab-main';
3157                         case NS_USER:
3158                         case NS_USER_TALK:
3159                                 return 'nstab-user';
3160                         case NS_MEDIA:
3161                                 return 'nstab-media';
3162                         case NS_SPECIAL:
3163                                 return 'nstab-special';
3164                         case NS_PROJECT:
3165                         case NS_PROJECT_TALK:
3166                                 return 'nstab-project';
3167                         case NS_IMAGE:
3168                         case NS_IMAGE_TALK:
3169                                 return 'nstab-image';
3170                         case NS_MEDIAWIKI:
3171                         case NS_MEDIAWIKI_TALK:
3172                                 return 'nstab-mediawiki';
3173                         case NS_TEMPLATE:
3174                         case NS_TEMPLATE_TALK:
3175                                 return 'nstab-template';
3176                         case NS_HELP:
3177                         case NS_HELP_TALK:
3178                                 return 'nstab-help';
3179                         case NS_CATEGORY:
3180                         case NS_CATEGORY_TALK:
3181                                 return 'nstab-category';
3182                         default:
3183                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3184                 }
3185         }
3186
3187         /**
3188          * Returns true if this title resolves to the named special page
3189          * @param string $name The special page name
3190          */
3191         public function isSpecial( $name ) {
3192                 if ( $this->getNamespace() == NS_SPECIAL ) {
3193                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3194                         if ( $name == $thisName ) {
3195                                 return true;
3196                         }
3197                 }
3198                 return false;
3199         }
3200
3201         /**
3202          * If the Title refers to a special page alias which is not the local default,
3203          * returns a new Title which points to the local default. Otherwise, returns $this.
3204          */
3205         public function fixSpecialName() {
3206                 if ( $this->getNamespace() == NS_SPECIAL ) {
3207                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3208                         if ( $canonicalName ) {
3209                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3210                                 if ( $localName != $this->mDbkeyform ) {
3211                                         return Title::makeTitle( NS_SPECIAL, $localName );
3212                                 }
3213                         }
3214                 }
3215                 return $this;
3216         }
3217
3218         /**
3219          * Is this Title in a namespace which contains content?
3220          * In other words, is this a content page, for the purposes of calculating
3221          * statistics, etc?
3222          *
3223          * @return bool
3224          */
3225         public function isContentPage() {
3226                 return MWNamespace::isContent( $this->getNamespace() );
3227         }
3228
3229         public function getRedirectsHere( $ns = null ) {
3230                 $redirs = array();
3231
3232                 $dbr = wfGetDB( DB_SLAVE );
3233                 $where = array(
3234                         'rd_namespace' => $this->getNamespace(),
3235                         'rd_title' => $this->getDBkey(),
3236                         'rd_from = page_id'
3237                 );
3238                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3239
3240                 $res = $dbr->select(
3241                         array( 'redirect', 'page' ),
3242                         array( 'page_namespace', 'page_title' ),
3243                         $where,
3244                         __METHOD__
3245                 );
3246
3247
3248                 foreach( $res as $row ) {
3249                         $redirs[] = self::newFromRow( $row );
3250                 }
3251                 return $redirs;
3252         }
3253 }