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
  66         # Don't change the following default, NS_MAIN is hardcoded in several
  67         # places.  See bug 696.
  68         var $mDefaultNamespace = NS_MAIN; # Namespace index when there is no namespace
  69                                           # Zero except in {{transclusion}} tags
  70         var $mWatched = null;             # Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  71         var $mLength = -1;                # The page length, 0 for special pages
  72         var $mRedirect = null;            # Is the article at this title a redirect?
  73         /**#@-*/
  74
  75
  76         /**
  77          * Constructor
  78          * @private
  79          */
  80         /* private */ function __construct() {}
  81
  82         /**
  83          * Create a new Title from a prefixed DB key
  84          * @param string $key The database key, which has underscores
  85          *      instead of spaces, possibly including namespace and
  86          *      interwiki prefixes
  87          * @return Title the new object, or NULL on an error
  88          */
  89         public static function newFromDBkey( $key ) {
  90                 $t = new Title();
  91                 $t->mDbkeyform = $key;
  92                 if( $t->secureAndSplit() )
  93                         return $t;
  94                 else
  95                         return NULL;
  96         }
  97
  98         /**
  99          * Create a new Title from text, such as what one would
 100          * find in a link. Decodes any HTML entities in the text.
 101          *
 102          * @param string $text the link text; spaces, prefixes,
 103          *      and an initial ':' indicating the main namespace
 104          *      are accepted
 105          * @param int $defaultNamespace the namespace to use if
 106          *      none is specified by a prefix
 107          * @return Title the new object, or NULL on an error
 108          */
 109         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 110                 if( is_object( $text ) ) {
 111                         throw new MWException( 'Title::newFromText given an object' );
 112                 }
 113
 114                 /**
 115                  * Wiki pages often contain multiple links to the same page.
 116                  * Title normalization and parsing can become expensive on
 117                  * pages with many links, so we can save a little time by
 118                  * caching them.
 119                  *
 120                  * In theory these are value objects and won't get changed...
 121                  */
 122                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 123                         return Title::$titleCache[$text];
 124                 }
 125
 126                 /**
 127                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 128                  */
 129                 $filteredText = Sanitizer::decodeCharReferences( $text );
 130
 131                 $t = new Title();
 132                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 133                 $t->mDefaultNamespace = $defaultNamespace;
 134
 135                 static $cachedcount = 0 ;
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         Title::$titleCache = array();
 141                                         $cachedcount=0;
 142                                 }
 143                                 $cachedcount++;
 144                                 Title::$titleCache[$text] =& $t;
 145                         }
 146                         return $t;
 147                 } else {
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param string $url the title, as might be taken from a URL
 157          * @return Title the new object, or NULL on an error
 158          */
 159         public static function newFromURL( $url ) {
 160                 global $wgLegalTitleChars;
 161                 $t = new Title();
 162
 163                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 164                 # but some URLs used it as a space replacement and they still come
 165                 # from some external search tools.
 166                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 167                         $url = str_replace( '+', ' ', $url );
 168                 }
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param int $id the page_id corresponding to the Title to create
 185          * @param int $flags, use GAID_FOR_UPDATE to use master
 186          * @return Title the new object, or NULL on an error
 187          */
 188         public static function newFromID( $id, $flags = 0 ) {
 189                 $fname = 'Title::newFromID';
 190                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 191                 $row = $db->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 192                         array( 'page_id' => $id ), $fname );
 193                 if ( $row !== false ) {
 194                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 195                 } else {
 196                         $title = NULL;
 197                 }
 198                 return $title;
 199         }
 200
 201         /**
 202          * Make an array of titles from an array of IDs
 203          */
 204         public static function newFromIDs( $ids ) {
 205                 if ( !count( $ids ) ) {
 206                         return array();
 207                 }
 208                 $dbr = wfGetDB( DB_SLAVE );
 209                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 210                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 211
 212                 $titles = array();
 213                 foreach( $res as $row ) {
 214                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 215                 }
 216                 return $titles;
 217         }
 218
 219         /**
 220          * Make a Title object from a DB row
 221          * @param Row $row (needs at least page_title,page_namespace)
 222          */
 223         public static function newFromRow( $row ) {
 224                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 225
 226                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 227                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 228                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 229                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 230
 231                 return $t;
 232         }
 233
 234         /**
 235          * Create a new Title from a namespace index and a DB key.
 236          * It's assumed that $ns and $title are *valid*, for instance when
 237          * they came directly from the database or a special page name.
 238          * For convenience, spaces are converted to underscores so that
 239          * eg user_text fields can be used directly.
 240          *
 241          * @param int $ns the namespace of the article
 242          * @param string $title the unprefixed database key form
 243          * @param string $fragment The link fragment (after the "#")
 244          * @return Title the new object
 245          */
 246         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 247                 $t = new Title();
 248                 $t->mInterwiki = '';
 249                 $t->mFragment = $fragment;
 250                 $t->mNamespace = $ns = intval( $ns );
 251                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 252                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 253                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 254                 $t->mTextform = str_replace( '_', ' ', $title );
 255                 return $t;
 256         }
 257
 258         /**
 259          * Create a new Title from a namespace index and a DB key.
 260          * The parameters will be checked for validity, which is a bit slower
 261          * than makeTitle() but safer for user-provided data.
 262          *
 263          * @param int $ns the namespace of the article
 264          * @param string $title the database key form
 265          * @param string $fragment The link fragment (after the "#")
 266          * @return Title the new object, or NULL on an error
 267          */
 268         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 269                 $t = new Title();
 270                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 271                 if( $t->secureAndSplit() ) {
 272                         return $t;
 273                 } else {
 274                         return NULL;
 275                 }
 276         }
 277
 278         /**
 279          * Create a new Title for the Main Page
 280          * @return Title the new object
 281          */
 282         public static function newMainPage() {
 283                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 284                 // Don't give fatal errors if the message is broken
 285                 if ( !$title ) {
 286                         $title = Title::newFromText( 'Main Page' );
 287                 }
 288                 return $title;
 289         }
 290
 291         /**
 292          * Extract a redirect destination from a string and return the
 293          * Title, or null if the text doesn't contain a valid redirect
 294          *
 295          * @param string $text Text with possible redirect
 296          * @return Title
 297          */
 298         public static function newFromRedirect( $text ) {
 299                 $redir = MagicWord::get( 'redirect' );
 300                 $text = trim($text);
 301                 if( $redir->matchStartAndRemove( $text ) ) {
 302                         // Extract the first link and see if it's usable
 303                         // Ensure that it really does come directly after #REDIRECT
 304                         // Some older redirects included a colon, so don't freak about that!
 305                         $m = array();
 306                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 307                                 // Strip preceding colon used to "escape" categories, etc.
 308                                 // and URL-decode links
 309                                 if( strpos( $m[1], '%' ) !== false ) {
 310                                         // Match behavior of inline link parsing here;
 311                                         // don't interpret + as " " most of the time!
 312                                         // It might be safe to just use rawurldecode instead, though.
 313                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 314                                 }
 315                                 $title = Title::newFromText( $m[1] );
 316                                 // Redirects to Special:Userlogout are not permitted
 317                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 318                                         return $title;
 319                         }
 320                 }
 321                 return null;
 322         }
 323
 324 #----------------------------------------------------------------------------
 325 #       Static functions
 326 #----------------------------------------------------------------------------
 327
 328         /**
 329          * Get the prefixed DB key associated with an ID
 330          * @param int $id the page_id of the article
 331          * @return Title an object representing the article, or NULL
 332          *      if no such article was found
 333          */
 334         public static function nameOf( $id ) {
 335                 $dbr = wfGetDB( DB_SLAVE );
 336
 337                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), __METHOD__ );
 338                 if ( $s === false ) { return NULL; }
 339
 340                 $n = self::makeName( $s->page_namespace, $s->page_title );
 341                 return $n;
 342         }
 343
 344         /**
 345          * Get a regex character class describing the legal characters in a link
 346          * @return string the list of characters, not delimited
 347          */
 348         public static function legalChars() {
 349                 global $wgLegalTitleChars;
 350                 return $wgLegalTitleChars;
 351         }
 352
 353         /**
 354          * Get a string representation of a title suitable for
 355          * including in a search index
 356          *
 357          * @param int $ns a namespace index
 358          * @param string $title text-form main part
 359          * @return string a stripped-down title string ready for the
 360          *      search index
 361          */
 362         public static function indexTitle( $ns, $title ) {
 363                 global $wgContLang;
 364
 365                 $lc = SearchEngine::legalSearchChars() . '&#;';
 366                 $t = $wgContLang->stripForSearch( $title );
 367                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 368                 $t = $wgContLang->lc( $t );
 369
 370                 # Handle 's, s'
 371                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 372                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 373
 374                 $t = preg_replace( "/\\s+/", ' ', $t );
 375
 376                 if ( $ns == NS_IMAGE ) {
 377                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 378                 }
 379                 return trim( $t );
 380         }
 381
 382         /*
 383          * Make a prefixed DB key from a DB key and a namespace index
 384          * @param int $ns numerical representation of the namespace
 385          * @param string $title the DB key form the title
 386          * @param string $fragment The link fragment (after the "#")
 387          * @return string the prefixed form of the title
 388          */
 389         public static function makeName( $ns, $title, $fragment = '' ) {
 390                 global $wgContLang;
 391
 392                 $namespace = $wgContLang->getNsText( $ns );
 393                 $name = $namespace == '' ? $title : "$namespace:$title";
 394                 if ( strval( $fragment ) != '' ) {
 395                         $name .= '#' . $fragment;
 396                 }
 397                 return $name;
 398         }
 399
 400         /**
 401          * Returns the URL associated with an interwiki prefix
 402          * @param string $key the interwiki prefix (e.g. "MeatBall")
 403          * @return the associated URL, containing "$1", which should be
 404          *      replaced by an article title
 405          * @static (arguably)
 406          */
 407         public function getInterwikiLink( $key )  {
 408                 global $wgMemc, $wgInterwikiExpiry;
 409                 global $wgInterwikiCache, $wgContLang;
 410                 $fname = 'Title::getInterwikiLink';
 411
 412                 $key = $wgContLang->lc( $key );
 413
 414                 $k = wfMemcKey( 'interwiki', $key );
 415                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 416                         return Title::$interwikiCache[$k]->iw_url;
 417                 }
 418
 419                 if ($wgInterwikiCache) {
 420                         return Title::getInterwikiCached( $key );
 421                 }
 422
 423                 $s = $wgMemc->get( $k );
 424                 # Ignore old keys with no iw_local
 425                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 426                         Title::$interwikiCache[$k] = $s;
 427                         return $s->iw_url;
 428                 }
 429
 430                 $dbr = wfGetDB( DB_SLAVE );
 431                 $res = $dbr->select( 'interwiki',
 432                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 433                         array( 'iw_prefix' => $key ), $fname );
 434                 if( !$res ) {
 435                         return '';
 436                 }
 437
 438                 $s = $dbr->fetchObject( $res );
 439                 if( !$s ) {
 440                         # Cache non-existence: create a blank object and save it to memcached
 441                         $s = (object)false;
 442                         $s->iw_url = '';
 443                         $s->iw_local = 0;
 444                         $s->iw_trans = 0;
 445                 }
 446                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 447                 Title::$interwikiCache[$k] = $s;
 448
 449                 return $s->iw_url;
 450         }
 451
 452         /**
 453          * Fetch interwiki prefix data from local cache in constant database
 454          *
 455          * More logic is explained in DefaultSettings
 456          *
 457          * @return string URL of interwiki site
 458          */
 459         public static function getInterwikiCached( $key ) {
 460                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 461                 static $db, $site;
 462
 463                 if (!$db)
 464                         $db=dba_open($wgInterwikiCache,'r','cdb');
 465                 /* Resolve site name */
 466                 if ($wgInterwikiScopes>=3 and !$site) {
 467                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 468                         if ($site=="")
 469                                 $site = $wgInterwikiFallbackSite;
 470                 }
 471                 $value = dba_fetch( wfMemcKey( $key ), $db);
 472                 if ($value=='' and $wgInterwikiScopes>=3) {
 473                         /* try site-level */
 474                         $value = dba_fetch("_{$site}:{$key}", $db);
 475                 }
 476                 if ($value=='' and $wgInterwikiScopes>=2) {
 477                         /* try globals */
 478                         $value = dba_fetch("__global:{$key}", $db);
 479                 }
 480                 if ($value=='undef')
 481                         $value='';
 482                 $s = (object)false;
 483                 $s->iw_url = '';
 484                 $s->iw_local = 0;
 485                 $s->iw_trans = 0;
 486                 if ($value!='') {
 487                         list($local,$url)=explode(' ',$value,2);
 488                         $s->iw_url=$url;
 489                         $s->iw_local=(int)$local;
 490                 }
 491                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 492                 return $s->iw_url;
 493         }
 494         /**
 495          * Determine whether the object refers to a page within
 496          * this project.
 497          *
 498          * @return bool TRUE if this is an in-project interwiki link
 499          *      or a wikilink, FALSE otherwise
 500          */
 501         public function isLocal() {
 502                 if ( $this->mInterwiki != '' ) {
 503                         # Make sure key is loaded into cache
 504                         $this->getInterwikiLink( $this->mInterwiki );
 505                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 506                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 507                 } else {
 508                         return true;
 509                 }
 510         }
 511
 512         /**
 513          * Determine whether the object refers to a page within
 514          * this project and is transcludable.
 515          *
 516          * @return bool TRUE if this is transcludable
 517          */
 518         public function isTrans() {
 519                 if ($this->mInterwiki == '')
 520                         return false;
 521                 # Make sure key is loaded into cache
 522                 $this->getInterwikiLink( $this->mInterwiki );
 523                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 524                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 525         }
 526
 527         /**
 528          * Escape a text fragment, say from a link, for a URL
 529          */
 530         static function escapeFragmentForURL( $fragment ) {
 531                 $fragment = str_replace( ' ', '_', $fragment );
 532                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 533                 $replaceArray = array(
 534                         '%3A' => ':',
 535                         '%' => '.'
 536                 );
 537                 return strtr( $fragment, $replaceArray );
 538         }
 539
 540 #----------------------------------------------------------------------------
 541 #       Other stuff
 542 #----------------------------------------------------------------------------
 543
 544         /** Simple accessors */
 545         /**
 546          * Get the text form (spaces not underscores) of the main part
 547          * @return string
 548          */
 549         public function getText() { return $this->mTextform; }
 550         /**
 551          * Get the URL-encoded form of the main part
 552          * @return string
 553          */
 554         public function getPartialURL() { return $this->mUrlform; }
 555         /**
 556          * Get the main part with underscores
 557          * @return string
 558          */
 559         public function getDBkey() { return $this->mDbkeyform; }
 560         /**
 561          * Get the namespace index, i.e. one of the NS_xxxx constants
 562          * @return int
 563          */
 564         public function getNamespace() { return $this->mNamespace; }
 565         /**
 566          * Get the namespace text
 567          * @return string
 568          */
 569         public function getNsText() {
 570                 global $wgContLang, $wgCanonicalNamespaceNames;
 571
 572                 if ( '' != $this->mInterwiki ) {
 573                         // This probably shouldn't even happen. ohh man, oh yuck.
 574                         // But for interwiki transclusion it sometimes does.
 575                         // Shit. Shit shit shit.
 576                         //
 577                         // Use the canonical namespaces if possible to try to
 578                         // resolve a foreign namespace.
 579                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 580                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 581                         }
 582                 }
 583                 return $wgContLang->getNsText( $this->mNamespace );
 584         }
 585         /**
 586          * Get the DB key with the initial letter case as specified by the user
 587          */
 588         function getUserCaseDBKey() {
 589                 return $this->mUserCaseDBKey;
 590         }
 591         /**
 592          * Get the namespace text of the subject (rather than talk) page
 593          * @return string
 594          */
 595         public function getSubjectNsText() {
 596                 global $wgContLang;
 597                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 598         }
 599
 600         /**
 601          * Get the namespace text of the talk page
 602          * @return string
 603          */
 604         public function getTalkNsText() {
 605                 global $wgContLang;
 606                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 607         }
 608
 609         /**
 610          * Could this title have a corresponding talk page?
 611          * @return bool
 612          */
 613         public function canTalk() {
 614                 return( MWNamespace::canTalk( $this->mNamespace ) );
 615         }
 616
 617         /**
 618          * Get the interwiki prefix (or null string)
 619          * @return string
 620          */
 621         public function getInterwiki() { return $this->mInterwiki; }
 622         /**
 623          * Get the Title fragment (i.e. the bit after the #) in text form
 624          * @return string
 625          */
 626         public function getFragment() { return $this->mFragment; }
 627         /**
 628          * Get the fragment in URL form, including the "#" character if there is one
 629          * @return string
 630          */
 631         public function getFragmentForURL() {
 632                 if ( $this->mFragment == '' ) {
 633                         return '';
 634                 } else {
 635                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 636                 }
 637         }
 638         /**
 639          * Get the default namespace index, for when there is no namespace
 640          * @return int
 641          */
 642         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 643
 644         /**
 645          * Get title for search index
 646          * @return string a stripped-down title string ready for the
 647          *      search index
 648          */
 649         public function getIndexTitle() {
 650                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 651         }
 652
 653         /**
 654          * Get the prefixed database key form
 655          * @return string the prefixed title, with underscores and
 656          *      any interwiki and namespace prefixes
 657          */
 658         public function getPrefixedDBkey() {
 659                 $s = $this->prefix( $this->mDbkeyform );
 660                 $s = str_replace( ' ', '_', $s );
 661                 return $s;
 662         }
 663
 664         /**
 665          * Get the prefixed title with spaces.
 666          * This is the form usually used for display
 667          * @return string the prefixed title, with spaces
 668          */
 669         public function getPrefixedText() {
 670                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 671                         $s = $this->prefix( $this->mTextform );
 672                         $s = str_replace( '_', ' ', $s );
 673                         $this->mPrefixedText = $s;
 674                 }
 675                 return $this->mPrefixedText;
 676         }
 677
 678         /**
 679          * Get the prefixed title with spaces, plus any fragment
 680          * (part beginning with '#')
 681          * @return string the prefixed title, with spaces and
 682          *      the fragment, including '#'
 683          */
 684         public function getFullText() {
 685                 $text = $this->getPrefixedText();
 686                 if( '' != $this->mFragment ) {
 687                         $text .= '#' . $this->mFragment;
 688                 }
 689                 return $text;
 690         }
 691
 692         /**
 693          * Get the base name, i.e. the leftmost parts before the /
 694          * @return string Base name
 695          */
 696         public function getBaseText() {
 697                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 698                         return $this->getText();
 699                 }
 700
 701                 $parts = explode( '/', $this->getText() );
 702                 # Don't discard the real title if there's no subpage involved
 703                 if( count( $parts ) > 1 )
 704                         unset( $parts[ count( $parts ) - 1 ] );
 705                 return implode( '/', $parts );
 706         }
 707
 708         /**
 709          * Get the lowest-level subpage name, i.e. the rightmost part after /
 710          * @return string Subpage name
 711          */
 712         public function getSubpageText() {
 713                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 714                         return( $this->mTextform );
 715                 }
 716                 $parts = explode( '/', $this->mTextform );
 717                 return( $parts[ count( $parts ) - 1 ] );
 718         }
 719
 720         /**
 721          * Get a URL-encoded form of the subpage text
 722          * @return string URL-encoded subpage name
 723          */
 724         public function getSubpageUrlForm() {
 725                 $text = $this->getSubpageText();
 726                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 727                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 728                 return( $text );
 729         }
 730
 731         /**
 732          * Get a URL-encoded title (not an actual URL) including interwiki
 733          * @return string the URL-encoded form
 734          */
 735         public function getPrefixedURL() {
 736                 $s = $this->prefix( $this->mDbkeyform );
 737                 $s = str_replace( ' ', '_', $s );
 738
 739                 $s = wfUrlencode ( $s ) ;
 740
 741                 # Cleaning up URL to make it look nice -- is this safe?
 742                 $s = str_replace( '%28', '(', $s );
 743                 $s = str_replace( '%29', ')', $s );
 744
 745                 return $s;
 746         }
 747
 748         /**
 749          * Get a real URL referring to this title, with interwiki link and
 750          * fragment
 751          *
 752          * @param array $query an optional query string, not used for interwiki
 753          *   links. Can be specified as an associative array as well, e.g.,
 754          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 755          * @param string $variant language variant of url (for sr, zh..)
 756          * @return string the URL
 757          */
 758         public function getFullURL( $query = '', $variant = false ) {
 759                 global $wgContLang, $wgServer, $wgRequest;
 760
 761                 if( is_array( $query ) ) {
 762                         $query = wfArrayToCGI( $query );
 763                 }
 764
 765                 if ( '' == $this->mInterwiki ) {
 766                         $url = $this->getLocalUrl( $query, $variant );
 767
 768                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 769                         // Correct fix would be to move the prepending elsewhere.
 770                         if ($wgRequest->getVal('action') != 'render') {
 771                                 $url = $wgServer . $url;
 772                         }
 773                 } else {
 774                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 775
 776                         $namespace = wfUrlencode( $this->getNsText() );
 777                         if ( '' != $namespace ) {
 778                                 # Can this actually happen? Interwikis shouldn't be parsed.
 779                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 780                                 $namespace .= ':';
 781                         }
 782                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 783                         $url = wfAppendQuery( $url, $query );
 784                 }
 785
 786                 # Finally, add the fragment.
 787                 $url .= $this->getFragmentForURL();
 788
 789                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 790                 return $url;
 791         }
 792
 793         /**
 794          * Get a URL with no fragment or server name.  If this page is generated
 795          * with action=render, $wgServer is prepended.
 796          * @param mixed $query an optional query string; if not specified,
 797          *       $wgArticlePath will be used.  Can be specified as an associative array
 798          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 799          *   URL-escaped).
 800          * @param string $variant language variant of url (for sr, zh..)
 801          * @return string the URL
 802          */
 803         public function getLocalURL( $query = '', $variant = false ) {
 804                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 805                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 806
 807                 if( is_array( $query ) ) {
 808                         $query = wfArrayToCGI( $query );
 809                 }
 810
 811                 // internal links should point to same variant as current page (only anonymous users)
 812                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 813                         $pref = $wgContLang->getPreferredVariant(false);
 814                         if($pref != $wgContLang->getCode())
 815                                 $variant = $pref;
 816                 }
 817
 818                 if ( $this->isExternal() ) {
 819                         $url = $this->getFullURL();
 820                         if ( $query ) {
 821                                 // This is currently only used for edit section links in the
 822                                 // context of interwiki transclusion. In theory we should
 823                                 // append the query to the end of any existing query string,
 824                                 // but interwiki transclusion is already broken in that case.
 825                                 $url .= "?$query";
 826                         }
 827                 } else {
 828                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 829                         if ( $query == '' ) {
 830                                 if( $variant != false && $wgContLang->hasVariants() ) {
 831                                         if( $wgVariantArticlePath == false ) {
 832                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 833                                         } else {
 834                                                 $variantArticlePath = $wgVariantArticlePath;
 835                                         }
 836                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 837                                         $url = str_replace( '$1', $dbkey, $url  );
 838                                 } else {
 839                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 840                                 }
 841                         } else {
 842                                 global $wgActionPaths;
 843                                 $url = false;
 844                                 $matches = array();
 845                                 if( !empty( $wgActionPaths ) &&
 846                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 847                                 {
 848                                         $action = urldecode( $matches[2] );
 849                                         if( isset( $wgActionPaths[$action] ) ) {
 850                                                 $query = $matches[1];
 851                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 852                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 853                                                 if( $query != '' ) $url .= '?' . $query;
 854                                         }
 855                                 }
 856                                 if ( $url === false ) {
 857                                         if ( $query == '-' ) {
 858                                                 $query = '';
 859                                         }
 860                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 861                                 }
 862                         }
 863
 864                         // FIXME: this causes breakage in various places when we
 865                         // actually expected a local URL and end up with dupe prefixes.
 866                         if ($wgRequest->getVal('action') == 'render') {
 867                                 $url = $wgServer . $url;
 868                         }
 869                 }
 870                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 871                 return $url;
 872         }
 873
 874         /**
 875          * Get a URL that's the simplest URL that will be valid to link, locally,
 876          * to the current Title.  It includes the fragment, but does not include
 877          * the server unless action=render is used (or the link is external).  If
 878          * there's a fragment but the prefixed text is empty, we just return a link
 879          * to the fragment.
 880          *
 881          * @param array $query An associative array of key => value pairs for the
 882          *   query string.  Keys and values will be escaped.
 883          * @param string $variant Language variant of URL (for sr, zh..).  Ignored
 884          *   for external links.  Default is "false" (same variant as current page,
 885          *   for anonymous users).
 886          * @return string the URL
 887          */
 888         public function getLinkUrl( $query = array(), $variant = false ) {
 889                 if( !is_array( $query ) ) {
 890                         throw new MWException( 'Title::getLinkUrl passed a non-array for '.
 891                         '$query' );
 892                 }
 893                 if( $this->isExternal() ) {
 894                         return $this->getFullURL( $query );
 895                 } elseif( $this->getPrefixedText() === ''
 896                 and $this->getFragment() !== '' ) {
 897                         return $this->getFragmentForURL();
 898                 } else {
 899                         return $this->getLocalURL( $query, $variant )
 900                                 . $this->getFragmentForURL();
 901                 }
 902         }
 903
 904         /**
 905          * Get an HTML-escaped version of the URL form, suitable for
 906          * using in a link, without a server name or fragment
 907          * @param string $query an optional query string
 908          * @return string the URL
 909          */
 910         public function escapeLocalURL( $query = '' ) {
 911                 return htmlspecialchars( $this->getLocalURL( $query ) );
 912         }
 913
 914         /**
 915          * Get an HTML-escaped version of the URL form, suitable for
 916          * using in a link, including the server name and fragment
 917          *
 918          * @return string the URL
 919          * @param string $query an optional query string
 920          */
 921         public function escapeFullURL( $query = '' ) {
 922                 return htmlspecialchars( $this->getFullURL( $query ) );
 923         }
 924
 925         /**
 926          * Get the URL form for an internal link.
 927          * - Used in various Squid-related code, in case we have a different
 928          * internal hostname for the server from the exposed one.
 929          *
 930          * @param string $query an optional query string
 931          * @param string $variant language variant of url (for sr, zh..)
 932          * @return string the URL
 933          */
 934         public function getInternalURL( $query = '', $variant = false ) {
 935                 global $wgInternalServer;
 936                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 937                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 938                 return $url;
 939         }
 940
 941         /**
 942          * Get the edit URL for this Title
 943          * @return string the URL, or a null string if this is an
 944          *      interwiki link
 945          */
 946         public function getEditURL() {
 947                 if ( '' != $this->mInterwiki ) { return ''; }
 948                 $s = $this->getLocalURL( 'action=edit' );
 949
 950                 return $s;
 951         }
 952
 953         /**
 954          * Get the HTML-escaped displayable text form.
 955          * Used for the title field in <a> tags.
 956          * @return string the text, including any prefixes
 957          */
 958         public function getEscapedText() {
 959                 return htmlspecialchars( $this->getPrefixedText() );
 960         }
 961
 962         /**
 963          * Is this Title interwiki?
 964          * @return boolean
 965          */
 966         public function isExternal() { return ( '' != $this->mInterwiki ); }
 967
 968         /**
 969          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 970          *
 971          * @param string Action to check (default: edit)
 972          * @return bool
 973          */
 974         public function isSemiProtected( $action = 'edit' ) {
 975                 if( $this->exists() ) {
 976                         $restrictions = $this->getRestrictions( $action );
 977                         if( count( $restrictions ) > 0 ) {
 978                                 foreach( $restrictions as $restriction ) {
 979                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 980                                                 return false;
 981                                 }
 982                         } else {
 983                                 # Not protected
 984                                 return false;
 985                         }
 986                         return true;
 987                 } else {
 988                         # If it doesn't exist, it can't be protected
 989                         return false;
 990                 }
 991         }
 992
 993         /**
 994          * Does the title correspond to a protected article?
 995          * @param string $what the action the page is protected from,
 996          * by default checks move and edit
 997          * @return boolean
 998          */
 999         public function isProtected( $action = '' ) {
1000                 global $wgRestrictionLevels, $wgRestrictionTypes;
1001
1002                 # Special pages have inherent protection
1003                 if( $this->getNamespace() == NS_SPECIAL )
1004                         return true;
1005
1006                 # Check regular protection levels
1007                 foreach( $wgRestrictionTypes as $type ){
1008                         if( $action == $type || $action == '' ) {
1009                                 $r = $this->getRestrictions( $type );
1010                                 foreach( $wgRestrictionLevels as $level ) {
1011                                         if( in_array( $level, $r ) && $level != '' ) {
1012                                                 return true;
1013                                         }
1014                                 }
1015                         }
1016                 }
1017
1018                 return false;
1019         }
1020
1021         /**
1022          * Is $wgUser watching this page?
1023          * @return boolean
1024          */
1025         public function userIsWatching() {
1026                 global $wgUser;
1027
1028                 if ( is_null( $this->mWatched ) ) {
1029                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1030                                 $this->mWatched = false;
1031                         } else {
1032                                 $this->mWatched = $wgUser->isWatched( $this );
1033                         }
1034                 }
1035                 return $this->mWatched;
1036         }
1037
1038         /**
1039          * Can $wgUser perform $action on this page?
1040          * This skips potentially expensive cascading permission checks.
1041          *
1042          * Suitable for use for nonessential UI controls in common cases, but
1043          * _not_ for functional access control.
1044          *
1045          * May provide false positives, but should never provide a false negative.
1046          *
1047          * @param string $action action that permission needs to be checked for
1048          * @return boolean
1049          */
1050         public function quickUserCan( $action ) {
1051                 return $this->userCan( $action, false );
1052         }
1053
1054         /**
1055          * Determines if $wgUser is unable to edit this page because it has been protected
1056          * by $wgNamespaceProtection.
1057          *
1058          * @return boolean
1059          */
1060         public function isNamespaceProtected() {
1061                 global $wgNamespaceProtection, $wgUser;
1062                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1063                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1064                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1065                                         return true;
1066                         }
1067                 }
1068                 return false;
1069         }
1070
1071         /**
1072          * Can $wgUser perform $action on this page?
1073          * @param string $action action that permission needs to be checked for
1074          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1075          * @return boolean
1076          */
1077         public function userCan( $action, $doExpensiveQueries = true ) {
1078                 global $wgUser;
1079                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1080         }
1081
1082         /**
1083          * Can $user perform $action on this page?
1084          *
1085          * FIXME: This *does not* check throttles (User::pingLimiter()).
1086          *
1087          * @param string $action action that permission needs to be checked for
1088          * @param User $user user to check
1089          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1090          * @param array $ignoreErrors Set this to a list of message keys whose corresponding errors may be ignored.
1091          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1092          */
1093         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1094                 if( !StubObject::isRealObject( $user ) ) {
1095                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1096                         global $wgUser;
1097                         $wgUser->_unstub( '', 5 );
1098                         $user = $wgUser;
1099                 }
1100                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1101
1102                 global $wgContLang;
1103                 global $wgLang;
1104                 global $wgEmailConfirmToEdit;
1105
1106                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1107                         $errors[] = array( 'confirmedittext' );
1108                 }
1109
1110                 if ( $user->isBlockedFrom( $this ) && $action != 'createaccount' ) {
1111                         $block = $user->mBlock;
1112
1113                         // This is from OutputPage::blockedPage
1114                         // Copied at r23888 by werdna
1115
1116                         $id = $user->blockedBy();
1117                         $reason = $user->blockedFor();
1118                         if( $reason == '' ) {
1119                                 $reason = wfMsg( 'blockednoreason' );
1120                         }
1121                         $ip = wfGetIP();
1122
1123                         if ( is_numeric( $id ) ) {
1124                                 $name = User::whoIs( $id );
1125                         } else {
1126                                 $name = $id;
1127                         }
1128
1129                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1130                         $blockid = $block->mId;
1131                         $blockExpiry = $user->mBlock->mExpiry;
1132                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1133
1134                         if ( $blockExpiry == 'infinity' ) {
1135                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1136                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1137
1138                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1139                                         if ( strpos( $option, ':' ) == false )
1140                                                 continue;
1141
1142                                         list ($show, $value) = explode( ":", $option );
1143
1144                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1145                                                 $blockExpiry = $show;
1146                                                 break;
1147                                         }
1148                                 }
1149                         } else {
1150                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1151                         }
1152
1153                         $intended = $user->mBlock->mAddress;
1154
1155                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1156                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1157                 }
1158
1159                 // Remove the errors being ignored.
1160
1161                 foreach( $errors as $index => $error ) {
1162                         $error_key = is_array($error) ? $error[0] : $error;
1163
1164                         if (in_array( $error_key, $ignoreErrors )) {
1165                                 unset($errors[$index]);
1166                         }
1167                 }
1168
1169                 return $errors;
1170         }
1171
1172         /**
1173          * Can $user perform $action on this page? This is an internal function,
1174          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1175          * checks on wfReadOnly() and blocks)
1176          *
1177          * @param string $action action that permission needs to be checked for
1178          * @param User $user user to check
1179          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1180          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1181          */
1182         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1183                 wfProfileIn( __METHOD__ );
1184
1185                 $errors = array();
1186
1187                 // Use getUserPermissionsErrors instead
1188                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1189                         wfProfileOut( __METHOD__ );
1190                         return $result ? array() : array( array( 'badaccess-group0' ) );
1191                 }
1192
1193                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1194                         if ($result != array() && is_array($result) && !is_array($result[0]))
1195                                 $errors[] = $result; # A single array representing an error
1196                         else if (is_array($result) && is_array($result[0]))
1197                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1198                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1199                                 $errors[] = array($result); # A string representing a message-id
1200                         else if ($result === false )
1201                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1202                 }
1203                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1204                         if ($result != array() && is_array($result) && !is_array($result[0]))
1205                                 $errors[] = $result; # A single array representing an error
1206                         else if (is_array($result) && is_array($result[0]))
1207                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1208                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1209                                 $errors[] = array($result); # A string representing a message-id
1210                         else if ($result === false )
1211                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1212                 }
1213
1214                 $specialOKActions = array( 'createaccount', 'execute' );
1215                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1216                         $errors[] = array('ns-specialprotected');
1217                 }
1218
1219                 if ( $this->isNamespaceProtected() ) {
1220                         $ns = $this->getNamespace() == NS_MAIN
1221                                 ? wfMsg( 'nstab-main' )
1222                                 : $this->getNsText();
1223                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1224                                 ? array('protectedinterface')
1225                                 : array( 'namespaceprotected',  $ns ) );
1226                 }
1227
1228                 if( $this->mDbkeyform == '_' ) {
1229                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1230                         $errors[] = array('badaccess-group0');
1231                 }
1232
1233                 # protect css/js subpages of user pages
1234                 # XXX: this might be better using restrictions
1235                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1236                 if( $this->isCssJsSubpage()
1237                         && !$user->isAllowed('editusercssjs')
1238                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1239                         $errors[] = array('customcssjsprotected');
1240                 }
1241
1242                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1243                         # We /could/ use the protection level on the source page, but it's fairly ugly
1244                         #  as we have to establish a precedence hierarchy for pages included by multiple
1245                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1246                         #  as they could remove the protection anyway.
1247                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1248                         # Cascading protection depends on more than this page...
1249                         # Several cascading protected pages may include this page...
1250                         # Check each cascading level
1251                         # This is only for protection restrictions, not for all actions
1252                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1253                                 foreach( $restrictions[$action] as $right ) {
1254                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1255                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1256                                                 $pages = '';
1257                                                 foreach( $cascadingSources as $page )
1258                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1259                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1260                                         }
1261                                 }
1262                         }
1263                 }
1264
1265                 foreach( $this->getRestrictions($action) as $right ) {
1266                         // Backwards compatibility, rewrite sysop -> protect
1267                         if ( $right == 'sysop' ) {
1268                                 $right = 'protect';
1269                         }
1270                         if( '' != $right && !$user->isAllowed( $right ) ) {
1271                                 //Users with 'editprotected' permission can edit protected pages
1272                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1273                                         //Users with 'editprotected' permission cannot edit protected pages
1274                                         //with cascading option turned on.
1275                                         if($this->mCascadeRestriction) {
1276                                                 $errors[] = array( 'protectedpagetext', $right );
1277                                         } else {
1278                                                 //Nothing, user can edit!
1279                                         }
1280                                 } else {
1281                                         $errors[] = array( 'protectedpagetext', $right );
1282                                 }
1283                         }
1284                 }
1285
1286                 if ($action == 'protect') {
1287                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1288                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1289                         }
1290                 }
1291
1292                 if ($action == 'create') {
1293                         $title_protection = $this->getTitleProtection();
1294
1295                         if (is_array($title_protection)) {
1296                                 extract($title_protection);
1297
1298                                 if ($pt_create_perm == 'sysop')
1299                                         $pt_create_perm = 'protect';
1300
1301                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1302                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1303                                 }
1304                         }
1305
1306                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1307                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1308                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1309                         }
1310                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1311                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1312                 } elseif ( !$user->isAllowed( $action ) ) {
1313                         $return = null;
1314                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1315                                 User::getGroupsWithPermission( $action ) );
1316                         if ( $groups ) {
1317                                 $return = array( 'badaccess-groups',
1318                                         array(
1319                                                 implode( ', ', $groups ),
1320                                                 count( $groups ) ) );
1321                         }
1322                         else {
1323                                 $return = array( "badaccess-group0" );
1324                         }
1325                         $errors[] = $return;
1326                 }
1327
1328                 wfProfileOut( __METHOD__ );
1329                 return $errors;
1330         }
1331
1332         /**
1333          * Is this title subject to title protection?
1334          * @return mixed An associative array representing any existent title
1335          *   protection, or false if there's none.
1336          */
1337         private function getTitleProtection() {
1338                 // Can't protect pages in special namespaces
1339                 if ( $this->getNamespace() < 0 ) {
1340                         return false;
1341                 }
1342
1343                 wfDebug( wfBacktrace() );
1344
1345                 // Cache to avoid multiple database queries for the same title
1346                 if ( isset($this->mProtections) ) {
1347                         return $this->mProtections;
1348                 }
1349
1350                 $conds = array(
1351                         'pt_namespace' => $this->getNamespace(),
1352                         'pt_title' => $this->getDBkey()
1353                 );
1354
1355                 $dbr = wfGetDB( DB_SLAVE );
1356                 $res = $dbr->select( 'protected_titles', '*', $conds, __METHOD__ );
1357
1358                 if ($row = $dbr->fetchRow( $res )) {
1359                         $this->mProtections = $row;
1360                 } else {
1361                         $this->mProtections = false;
1362                 }
1363
1364                 return $this->mProtections;
1365         }
1366
1367         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1368                 global $wgUser,$wgContLang;
1369
1370                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1371                         && $expiry == $this->mRestrictionsExpiry) {
1372                         // No change
1373                         return true;
1374                 }
1375
1376                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1377
1378                 $dbw = wfGetDB( DB_MASTER );
1379
1380                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1381
1382                 $expiry_description = '';
1383                 if ( $encodedExpiry != 'infinity' ) {
1384                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1385                 }
1386
1387                 # Update protection table
1388                 if ($create_perm != '' ) {
1389                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1390                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1391                                         , 'pt_create_perm' => $create_perm
1392                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1393                                         , 'pt_expiry' => $encodedExpiry
1394                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1395                 } else {
1396                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1397                                 'pt_title' => $title ), __METHOD__ );
1398                 }
1399                 # Update the protection log
1400                 $log = new LogPage( 'protect' );
1401
1402                 if( $create_perm ) {
1403                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1404                 } else {
1405                         $log->addEntry( 'unprotect', $this, $reason );
1406                 }
1407
1408                 return true;
1409         }
1410
1411         /**
1412          * Remove any title protection (due to page existing
1413          */
1414         public function deleteTitleProtection() {
1415                 $dbw = wfGetDB( DB_MASTER );
1416
1417                 $dbw->delete( 'protected_titles',
1418                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1419         }
1420
1421         /**
1422          * Can $wgUser edit this page?
1423          * @return boolean
1424          * @deprecated use userCan('edit')
1425          */
1426         public function userCanEdit( $doExpensiveQueries = true ) {
1427                 return $this->userCan( 'edit', $doExpensiveQueries );
1428         }
1429
1430         /**
1431          * Can $wgUser create this page?
1432          * @return boolean
1433          * @deprecated use userCan('create')
1434          */
1435         public function userCanCreate( $doExpensiveQueries = true ) {
1436                 return $this->userCan( 'create', $doExpensiveQueries );
1437         }
1438
1439         /**
1440          * Can $wgUser move this page?
1441          * @return boolean
1442          * @deprecated use userCan('move')
1443          */
1444         public function userCanMove( $doExpensiveQueries = true ) {
1445                 return $this->userCan( 'move', $doExpensiveQueries );
1446         }
1447
1448         /**
1449          * Would anybody with sufficient privileges be able to move this page?
1450          * Some pages just aren't movable.
1451          *
1452          * @return boolean
1453          */
1454         public function isMovable() {
1455                 return MWNamespace::isMovable( $this->getNamespace() )
1456                         && $this->getInterwiki() == '';
1457         }
1458
1459         /**
1460          * Can $wgUser read this page?
1461          * @return boolean
1462          * @todo fold these checks into userCan()
1463          */
1464         public function userCanRead() {
1465                 global $wgUser, $wgGroupPermissions;
1466
1467                 $result = null;
1468                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1469                 if ( $result !== null ) {
1470                         return $result;
1471                 }
1472
1473                 # Shortcut for public wikis, allows skipping quite a bit of code
1474                 if ($wgGroupPermissions['*']['read'])
1475                         return true;
1476
1477                 if( $wgUser->isAllowed( 'read' ) ) {
1478                         return true;
1479                 } else {
1480                         global $wgWhitelistRead;
1481
1482                         /**
1483                          * Always grant access to the login page.
1484                          * Even anons need to be able to log in.
1485                         */
1486                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1487                                 return true;
1488                         }
1489
1490                         /**
1491                          * Bail out if there isn't whitelist
1492                          */
1493                         if( !is_array($wgWhitelistRead) ) {
1494                                 return false;
1495                         }
1496
1497                         /**
1498                          * Check for explicit whitelisting
1499                          */
1500                         $name = $this->getPrefixedText();
1501                         $dbName = $this->getPrefixedDBKey();
1502                         // Check with and without underscores
1503                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1504                                 return true;
1505
1506                         /**
1507                          * Old settings might have the title prefixed with
1508                          * a colon for main-namespace pages
1509                          */
1510                         if( $this->getNamespace() == NS_MAIN ) {
1511                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1512                                         return true;
1513                         }
1514
1515                         /**
1516                          * If it's a special page, ditch the subpage bit
1517                          * and check again
1518                          */
1519                         if( $this->getNamespace() == NS_SPECIAL ) {
1520                                 $name = $this->getDBkey();
1521                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1522                                 if ( $name === false ) {
1523                                         # Invalid special page, but we show standard login required message
1524                                         return false;
1525                                 }
1526
1527                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1528                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1529                                         return true;
1530                         }
1531
1532                 }
1533                 return false;
1534         }
1535
1536         /**
1537          * Is this a talk page of some sort?
1538          * @return bool
1539          */
1540         public function isTalkPage() {
1541                 return MWNamespace::isTalk( $this->getNamespace() );
1542         }
1543
1544         /**
1545          * Is this a subpage?
1546          * @return bool
1547          */
1548         public function isSubpage() {
1549                 return MWNamespace::hasSubpages( $this->mNamespace )
1550                         ? strpos( $this->getText(), '/' ) !== false
1551                         : false;
1552         }
1553
1554         /**
1555          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1556          * @return bool
1557          */
1558         public function hasSubpages() {
1559                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1560                         # Duh
1561                         return false;
1562                 }
1563
1564                 # We dynamically add a member variable for the purpose of this method
1565                 # alone to cache the result.  There's no point in having it hanging
1566                 # around uninitialized in every Title object; therefore we only add it
1567                 # if needed and don't declare it statically.
1568                 if( isset( $this->mHasSubpages ) ) {
1569                         return $this->mHasSubpages;
1570                 }
1571
1572                 $db = wfGetDB( DB_SLAVE );
1573                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1574                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1575                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1576                         __METHOD__
1577                 );
1578         }
1579
1580         /**
1581          * Could this page contain custom CSS or JavaScript, based
1582          * on the title?
1583          *
1584          * @return bool
1585          */
1586         public function isCssOrJsPage() {
1587                 return $this->mNamespace == NS_MEDIAWIKI
1588                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1589         }
1590
1591         /**
1592          * Is this a .css or .js subpage of a user page?
1593          * @return bool
1594          */
1595         public function isCssJsSubpage() {
1596                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1597         }
1598         /**
1599          * Is this a *valid* .css or .js subpage of a user page?
1600          * Check that the corresponding skin exists
1601          */
1602         public function isValidCssJsSubpage() {
1603                 if ( $this->isCssJsSubpage() ) {
1604                         $skinNames = Skin::getSkinNames();
1605                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1606                 } else {
1607                         return false;
1608                 }
1609         }
1610         /**
1611          * Trim down a .css or .js subpage title to get the corresponding skin name
1612          */
1613         public function getSkinFromCssJsSubpage() {
1614                 $subpage = explode( '/', $this->mTextform );
1615                 $subpage = $subpage[ count( $subpage ) - 1 ];
1616                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1617         }
1618         /**
1619          * Is this a .css subpage of a user page?
1620          * @return bool
1621          */
1622         public function isCssSubpage() {
1623                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1624         }
1625         /**
1626          * Is this a .js subpage of a user page?
1627          * @return bool
1628          */
1629         public function isJsSubpage() {
1630                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1631         }
1632         /**
1633          * Protect css/js subpages of user pages: can $wgUser edit
1634          * this page?
1635          *
1636          * @return boolean
1637          * @todo XXX: this might be better using restrictions
1638          */
1639         public function userCanEditCssJsSubpage() {
1640                 global $wgUser;
1641                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1642         }
1643
1644         /**
1645          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1646          *
1647          * @return bool If the page is subject to cascading restrictions.
1648          */
1649         public function isCascadeProtected() {
1650                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1651                 return ( $sources > 0 );
1652         }
1653
1654         /**
1655          * Cascading protection: Get the source of any cascading restrictions on this page.
1656          *
1657          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1658          * @return array( mixed title array, restriction array)
1659          * 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.
1660          * The restriction array is an array of each type, each of which contains an array of unique groups
1661          */
1662         public function getCascadeProtectionSources( $get_pages = true ) {
1663                 global $wgRestrictionTypes;
1664
1665                 # Define our dimension of restrictions types
1666                 $pagerestrictions = array();
1667                 foreach( $wgRestrictionTypes as $action )
1668                         $pagerestrictions[$action] = array();
1669
1670                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1671                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1672                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1673                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1674                 }
1675
1676                 wfProfileIn( __METHOD__ );
1677
1678                 $dbr = wfGetDb( DB_SLAVE );
1679
1680                 if ( $this->getNamespace() == NS_IMAGE ) {
1681                         $tables = array ('imagelinks', 'page_restrictions');
1682                         $where_clauses = array(
1683                                 'il_to' => $this->getDBkey(),
1684                                 'il_from=pr_page',
1685                                 'pr_cascade' => 1 );
1686                 } else {
1687                         $tables = array ('templatelinks', 'page_restrictions');
1688                         $where_clauses = array(
1689                                 'tl_namespace' => $this->getNamespace(),
1690                                 'tl_title' => $this->getDBkey(),
1691                                 'tl_from=pr_page',
1692                                 'pr_cascade' => 1 );
1693                 }
1694
1695                 if ( $get_pages ) {
1696                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1697                         $where_clauses[] = 'page_id=pr_page';
1698                         $tables[] = 'page';
1699                 } else {
1700                         $cols = array( 'pr_expiry' );
1701                 }
1702
1703                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1704
1705                 $sources = $get_pages ? array() : false;
1706                 $now = wfTimestampNow();
1707                 $purgeExpired = false;
1708
1709                 foreach( $res as $row ) {
1710                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1711                         if( $expiry > $now ) {
1712                                 if ($get_pages) {
1713                                         $page_id = $row->pr_page;
1714                                         $page_ns = $row->page_namespace;
1715                                         $page_title = $row->page_title;
1716                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1717                                         # Add groups needed for each restriction type if its not already there
1718                                         # Make sure this restriction type still exists
1719                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1720                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1721                                         }
1722                                 } else {
1723                                         $sources = true;
1724                                 }
1725                         } else {
1726                                 // Trigger lazy purge of expired restrictions from the db
1727                                 $purgeExpired = true;
1728                         }
1729                 }
1730                 if( $purgeExpired ) {
1731                         Title::purgeExpiredRestrictions();
1732                 }
1733
1734                 wfProfileOut( __METHOD__ );
1735
1736                 if ( $get_pages ) {
1737                         $this->mCascadeSources = $sources;
1738                         $this->mCascadingRestrictions = $pagerestrictions;
1739                 } else {
1740                         $this->mHasCascadingRestrictions = $sources;
1741                 }
1742
1743                 return array( $sources, $pagerestrictions );
1744         }
1745
1746         function areRestrictionsCascading() {
1747                 if (!$this->mRestrictionsLoaded) {
1748                         $this->loadRestrictions();
1749                 }
1750
1751                 return $this->mCascadeRestriction;
1752         }
1753
1754         /**
1755          * Loads a string into mRestrictions array
1756          * @param resource $res restrictions as an SQL result.
1757          */
1758         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1759                 global $wgRestrictionTypes;
1760                 $dbr = wfGetDB( DB_SLAVE );
1761
1762                 foreach( $wgRestrictionTypes as $type ){
1763                         $this->mRestrictions[$type] = array();
1764                 }
1765
1766                 $this->mCascadeRestriction = false;
1767                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1768
1769                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1770
1771                 if ( $oldFashionedRestrictions === NULL ) {
1772                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1773                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1774                 }
1775
1776                 if ($oldFashionedRestrictions != '') {
1777
1778                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1779                                 $temp = explode( '=', trim( $restrict ) );
1780                                 if(count($temp) == 1) {
1781                                         // old old format should be treated as edit/move restriction
1782                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1783                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1784                                 } else {
1785                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1786                                 }
1787                         }
1788
1789                         $this->mOldRestrictions = true;
1790
1791                 }
1792
1793                 if( $dbr->numRows( $res ) ) {
1794                         # Current system - load second to make them override.
1795                         $now = wfTimestampNow();
1796                         $purgeExpired = false;
1797
1798                         foreach( $res as $row ) {
1799                                 # Cycle through all the restrictions.
1800
1801                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1802                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1803                                         continue;
1804
1805                                 // This code should be refactored, now that it's being used more generally,
1806                                 // But I don't really see any harm in leaving it in Block for now -werdna
1807                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1808
1809                                 // Only apply the restrictions if they haven't expired!
1810                                 if ( !$expiry || $expiry > $now ) {
1811                                         $this->mRestrictionsExpiry = $expiry;
1812                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1813
1814                                         $this->mCascadeRestriction |= $row->pr_cascade;
1815                                 } else {
1816                                         // Trigger a lazy purge of expired restrictions
1817                                         $purgeExpired = true;
1818                                 }
1819                         }
1820
1821                         if( $purgeExpired ) {
1822                                 Title::purgeExpiredRestrictions();
1823                         }
1824                 }
1825
1826                 $this->mRestrictionsLoaded = true;
1827         }
1828
1829         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1830                 if( !$this->mRestrictionsLoaded ) {
1831                         if ($this->exists()) {
1832                                 $dbr = wfGetDB( DB_SLAVE );
1833
1834                                 $res = $dbr->select( 'page_restrictions', '*',
1835                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1836
1837                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1838                         } else {
1839                                 $title_protection = $this->getTitleProtection();
1840
1841                                 if (is_array($title_protection)) {
1842                                         extract($title_protection);
1843
1844                                         $now = wfTimestampNow();
1845                                         $expiry = Block::decodeExpiry($pt_expiry);
1846
1847                                         if (!$expiry || $expiry > $now) {
1848                                                 // Apply the restrictions
1849                                                 $this->mRestrictionsExpiry = $expiry;
1850                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1851                                         } else { // Get rid of the old restrictions
1852                                                 Title::purgeExpiredRestrictions();
1853                                         }
1854                                 } else {
1855                                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1856                                 }
1857                                 $this->mRestrictionsLoaded = true;
1858                         }
1859                 }
1860         }
1861
1862         /**
1863          * Purge expired restrictions from the page_restrictions table
1864          */
1865         static function purgeExpiredRestrictions() {
1866                 $dbw = wfGetDB( DB_MASTER );
1867                 $dbw->delete( 'page_restrictions',
1868                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1869                         __METHOD__ );
1870
1871                 $dbw->delete( 'protected_titles',
1872                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1873                         __METHOD__ );
1874         }
1875
1876         /**
1877          * Accessor/initialisation for mRestrictions
1878          *
1879          * @param string $action action that permission needs to be checked for
1880          * @return array the array of groups allowed to edit this article
1881          */
1882         public function getRestrictions( $action ) {
1883                 if( !$this->mRestrictionsLoaded ) {
1884                         $this->loadRestrictions();
1885                 }
1886                 return isset( $this->mRestrictions[$action] )
1887                                 ? $this->mRestrictions[$action]
1888                                 : array();
1889         }
1890
1891         /**
1892          * Is there a version of this page in the deletion archive?
1893          * @return int the number of archived revisions
1894          */
1895         public function isDeleted() {
1896                 if ( $this->getNamespace() < 0 ) {
1897                         return 0;
1898                 }
1899
1900                 // Cache to avoid multiple queries for the same title
1901                 if ( isset($this->mIsDeleted) ) {
1902                         return $this->mIsDeleted;
1903                 }
1904
1905                 $dbr = wfGetDB( DB_SLAVE );
1906                 $aConds = array(
1907                         'ar_namespace' => $this->getNamespace(),
1908                         'ar_title' => $this->getDBkey()
1909                 );
1910                 $n = $dbr->selectField( 'archive', 'COUNT(*)', $aConds, __METHOD__ );
1911
1912                 if ( $this->getNamespace() == NS_IMAGE ) {
1913                         $faConds = array( 'fa_name' => $this->getDBkey() );
1914                         $n += $dbr->selectField( 'filearchive', 'COUNT(*)', $faConds , __METHOD__ );
1915                 }
1916
1917                 $this->mIsDeleted = (int) $n;
1918
1919                 return $this->mIsDeleted;
1920         }
1921
1922         /**
1923          * Get the article ID for this Title from the link cache,
1924          * adding it if necessary
1925          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1926          *      for update
1927          * @return int the ID
1928          */
1929         public function getArticleID( $flags = 0 ) {
1930                 $linkCache = LinkCache::singleton();
1931                 if ( $flags & GAID_FOR_UPDATE ) {
1932                         $oldUpdate = $linkCache->forUpdate( true );
1933                         $this->mArticleID = $linkCache->addLinkObj( $this );
1934                         $linkCache->forUpdate( $oldUpdate );
1935                 } else {
1936                         if ( -1 == $this->mArticleID ) {
1937                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1938                         }
1939                 }
1940                 return $this->mArticleID;
1941         }
1942
1943         /**
1944          * Is this an article that is a redirect page?
1945          * Uses link cache, adding it if necessary
1946          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1947          * @return bool
1948          */
1949         public function isRedirect( $flags = 0 ) {
1950                 if( !is_null($this->mRedirect) )
1951                         return $this->mRedirect;
1952                 # Zero for special pages.
1953                 # Also, calling getArticleID() loads the field from cache!
1954                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1955                         return false;
1956                 }
1957                 $linkCache = LinkCache::singleton();
1958                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1959
1960                 return $this->mRedirect;
1961         }
1962
1963         /**
1964          * What is the length of this page?
1965          * Uses link cache, adding it if necessary
1966          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1967          * @return bool
1968          */
1969         public function getLength( $flags = 0 ) {
1970                 if( $this->mLength != -1 )
1971                         return $this->mLength;
1972                 # Zero for special pages.
1973                 # Also, calling getArticleID() loads the field from cache!
1974                 if( !$this->getArticleID($flags) || $this->getNamespace() == NS_SPECIAL ) {
1975                         return 0;
1976                 }
1977                 $linkCache = LinkCache::singleton();
1978                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1979
1980                 return $this->mLength;
1981         }
1982
1983         /**
1984          * What is the page_latest field for this page?
1985          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select for update
1986          * @return int
1987          */
1988         public function getLatestRevID( $flags = 0 ) {
1989                 if ($this->mLatestID !== false)
1990                         return $this->mLatestID;
1991
1992                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
1993                 return $this->mLatestID = $db->selectField( 'revision',
1994                         "max(rev_id)",
1995                         array('rev_page' => $this->getArticleID($flags)),
1996                         'Title::getLatestRevID' );
1997         }
1998
1999         /**
2000          * This clears some fields in this object, and clears any associated
2001          * keys in the "bad links" section of the link cache.
2002          *
2003          * - This is called from Article::insertNewArticle() to allow
2004          * loading of the new page_id. It's also called from
2005          * Article::doDeleteArticle()
2006          *
2007          * @param int $newid the new Article ID
2008          */
2009         public function resetArticleID( $newid ) {
2010                 $linkCache = LinkCache::singleton();
2011                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2012
2013                 if ( 0 == $newid ) { $this->mArticleID = -1; }
2014                 else { $this->mArticleID = $newid; }
2015                 $this->mRestrictionsLoaded = false;
2016                 $this->mRestrictions = array();
2017         }
2018
2019         /**
2020          * Updates page_touched for this page; called from LinksUpdate.php
2021          * @return bool true if the update succeded
2022          */
2023         public function invalidateCache() {
2024                 global $wgUseFileCache;
2025
2026                 if ( wfReadOnly() ) {
2027                         return;
2028                 }
2029
2030                 $dbw = wfGetDB( DB_MASTER );
2031                 $success = $dbw->update( 'page',
2032                         array( /* SET */
2033                                 'page_touched' => $dbw->timestamp()
2034                         ), array( /* WHERE */
2035                                 'page_namespace' => $this->getNamespace() ,
2036                                 'page_title' => $this->getDBkey()
2037                         ), 'Title::invalidateCache'
2038                 );
2039
2040                 if ($wgUseFileCache) {
2041                         $cache = new HTMLFileCache($this);
2042                         @unlink($cache->fileCacheName());
2043                 }
2044
2045                 return $success;
2046         }
2047
2048         /**
2049          * Prefix some arbitrary text with the namespace or interwiki prefix
2050          * of this object
2051          *
2052          * @param string $name the text
2053          * @return string the prefixed text
2054          * @private
2055          */
2056         /* private */ function prefix( $name ) {
2057                 $p = '';
2058                 if ( '' != $this->mInterwiki ) {
2059                         $p = $this->mInterwiki . ':';
2060                 }
2061                 if ( 0 != $this->mNamespace ) {
2062                         $p .= $this->getNsText() . ':';
2063                 }
2064                 return $p . $name;
2065         }
2066
2067         /**
2068          * Secure and split - main initialisation function for this object
2069          *
2070          * Assumes that mDbkeyform has been set, and is urldecoded
2071          * and uses underscores, but not otherwise munged.  This function
2072          * removes illegal characters, splits off the interwiki and
2073          * namespace prefixes, sets the other forms, and canonicalizes
2074          * everything.
2075          * @return bool true on success
2076          */
2077         private function secureAndSplit() {
2078                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2079
2080                 # Initialisation
2081                 static $rxTc = false;
2082                 if( !$rxTc ) {
2083                         # Matching titles will be held as illegal.
2084                         $rxTc = '/' .
2085                                 # Any character not allowed is forbidden...
2086                                 '[^' . Title::legalChars() . ']' .
2087                                 # URL percent encoding sequences interfere with the ability
2088                                 # to round-trip titles -- you can't link to them consistently.
2089                                 '|%[0-9A-Fa-f]{2}' .
2090                                 # XML/HTML character references produce similar issues.
2091                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2092                                 '|&#[0-9]+;' .
2093                                 '|&#x[0-9A-Fa-f]+;' .
2094                                 '/S';
2095                 }
2096
2097                 $this->mInterwiki = $this->mFragment = '';
2098                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2099
2100                 $dbkey = $this->mDbkeyform;
2101
2102                 # Strip Unicode bidi override characters.
2103                 # Sometimes they slip into cut-n-pasted page titles, where the
2104                 # override chars get included in list displays.
2105                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
2106                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
2107
2108                 # Clean up whitespace
2109                 #
2110                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2111                 $dbkey = trim( $dbkey, '_' );
2112
2113                 if ( '' == $dbkey ) {
2114                         return false;
2115                 }
2116
2117                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2118                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2119                         return false;
2120                 }
2121
2122                 $this->mDbkeyform = $dbkey;
2123
2124                 # Initial colon indicates main namespace rather than specified default
2125                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2126                 if ( ':' == $dbkey{0} ) {
2127                         $this->mNamespace = NS_MAIN;
2128                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2129                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2130                 }
2131
2132                 # Namespace or interwiki prefix
2133                 $firstPass = true;
2134                 do {
2135                         $m = array();
2136                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
2137                                 $p = $m[1];
2138                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
2139                                         # Ordinary namespace
2140                                         $dbkey = $m[2];
2141                                         $this->mNamespace = $ns;
2142                                 } elseif( $this->getInterwikiLink( $p ) ) {
2143                                         if( !$firstPass ) {
2144                                                 # Can't make a local interwiki link to an interwiki link.
2145                                                 # That's just crazy!
2146                                                 return false;
2147                                         }
2148
2149                                         # Interwiki link
2150                                         $dbkey = $m[2];
2151                                         $this->mInterwiki = $wgContLang->lc( $p );
2152
2153                                         # Redundant interwiki prefix to the local wiki
2154                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2155                                                 if( $dbkey == '' ) {
2156                                                         # Can't have an empty self-link
2157                                                         return false;
2158                                                 }
2159                                                 $this->mInterwiki = '';
2160                                                 $firstPass = false;
2161                                                 # Do another namespace split...
2162                                                 continue;
2163                                         }
2164
2165                                         # If there's an initial colon after the interwiki, that also
2166                                         # resets the default namespace
2167                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2168                                                 $this->mNamespace = NS_MAIN;
2169                                                 $dbkey = substr( $dbkey, 1 );
2170                                         }
2171                                 }
2172                                 # If there's no recognized interwiki or namespace,
2173                                 # then let the colon expression be part of the title.
2174                         }
2175                         break;
2176                 } while( true );
2177
2178                 # We already know that some pages won't be in the database!
2179                 #
2180                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2181                         $this->mArticleID = 0;
2182                 }
2183                 $fragment = strstr( $dbkey, '#' );
2184                 if ( false !== $fragment ) {
2185                         $this->setFragment( $fragment );
2186                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2187                         # remove whitespace again: prevents "Foo_bar_#"
2188                         # becoming "Foo_bar_"
2189                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2190                 }
2191
2192                 # Reject illegal characters.
2193                 #
2194                 if( preg_match( $rxTc, $dbkey ) ) {
2195                         return false;
2196                 }
2197
2198                 /**
2199                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2200                  * reachable due to the way web browsers deal with 'relative' URLs.
2201                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2202                  */
2203                 if ( strpos( $dbkey, '.' ) !== false &&
2204                      ( $dbkey === '.' || $dbkey === '..' ||
2205                        strpos( $dbkey, './' ) === 0  ||
2206                        strpos( $dbkey, '../' ) === 0 ||
2207                        strpos( $dbkey, '/./' ) !== false ||
2208                        strpos( $dbkey, '/../' ) !== false  ||
2209                        substr( $dbkey, -2 ) == '/.' ||
2210                        substr( $dbkey, -3 ) == '/..' ) )
2211                 {
2212                         return false;
2213                 }
2214
2215                 /**
2216                  * Magic tilde sequences? Nu-uh!
2217                  */
2218                 if( strpos( $dbkey, '~~~' ) !== false ) {
2219                         return false;
2220                 }
2221
2222                 /**
2223                  * Limit the size of titles to 255 bytes.
2224                  * This is typically the size of the underlying database field.
2225                  * We make an exception for special pages, which don't need to be stored
2226                  * in the database, and may edge over 255 bytes due to subpage syntax
2227                  * for long titles, e.g. [[Special:Block/Long name]]
2228                  */
2229                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2230                   strlen( $dbkey ) > 512 )
2231                 {
2232                         return false;
2233                 }
2234
2235                 /**
2236                  * Normally, all wiki links are forced to have
2237                  * an initial capital letter so [[foo]] and [[Foo]]
2238                  * point to the same place.
2239                  *
2240                  * Don't force it for interwikis, since the other
2241                  * site might be case-sensitive.
2242                  */
2243                 $this->mUserCaseDBKey = $dbkey;
2244                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2245                         $dbkey = $wgContLang->ucfirst( $dbkey );
2246                 }
2247
2248                 /**
2249                  * Can't make a link to a namespace alone...
2250                  * "empty" local links can only be self-links
2251                  * with a fragment identifier.
2252                  */
2253                 if( $dbkey == '' &&
2254                         $this->mInterwiki == '' &&
2255                         $this->mNamespace != NS_MAIN ) {
2256                         return false;
2257                 }
2258                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2259                 // IP names are not allowed for accounts, and can only be referring to
2260                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2261                 // there are numerous ways to present the same IP. Having sp:contribs scan
2262                 // them all is silly and having some show the edits and others not is
2263                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2264                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2265                         IP::sanitizeIP( $dbkey ) : $dbkey;
2266                 // Any remaining initial :s are illegal.
2267                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2268                         return false;
2269                 }
2270
2271                 # Fill fields
2272                 $this->mDbkeyform = $dbkey;
2273                 $this->mUrlform = wfUrlencode( $dbkey );
2274
2275                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2276
2277                 return true;
2278         }
2279
2280         /**
2281          * Set the fragment for this title
2282          * This is kind of bad, since except for this rarely-used function, Title objects
2283          * are immutable. The reason this is here is because it's better than setting the
2284          * members directly, which is what Linker::formatComment was doing previously.
2285          *
2286          * @param string $fragment text
2287          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2288          */
2289         public function setFragment( $fragment ) {
2290                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2291         }
2292
2293         /**
2294          * Get a Title object associated with the talk page of this article
2295          * @return Title the object for the talk page
2296          */
2297         public function getTalkPage() {
2298                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2299         }
2300
2301         /**
2302          * Get a title object associated with the subject page of this
2303          * talk page
2304          *
2305          * @return Title the object for the subject page
2306          */
2307         public function getSubjectPage() {
2308                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2309         }
2310
2311         /**
2312          * Get an array of Title objects linking to this Title
2313          * Also stores the IDs in the link cache.
2314          *
2315          * WARNING: do not use this function on arbitrary user-supplied titles!
2316          * On heavily-used templates it will max out the memory.
2317          *
2318          * @param string $options may be FOR UPDATE
2319          * @return array the Title objects linking here
2320          */
2321         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2322                 $linkCache = LinkCache::singleton();
2323
2324                 if ( $options ) {
2325                         $db = wfGetDB( DB_MASTER );
2326                 } else {
2327                         $db = wfGetDB( DB_SLAVE );
2328                 }
2329
2330                 $res = $db->select( array( 'page', $table ),
2331                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2332                         array(
2333                                 "{$prefix}_from=page_id",
2334                                 "{$prefix}_namespace" => $this->getNamespace(),
2335                                 "{$prefix}_title"     => $this->getDBkey() ),
2336                         __METHOD__,
2337                         $options );
2338
2339                 $retVal = array();
2340                 if ( $db->numRows( $res ) ) {
2341                         foreach( $res as $row ) {
2342                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2343                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2344                                         $retVal[] = $titleObj;
2345                                 }
2346                         }
2347                 }
2348                 $db->freeResult( $res );
2349                 return $retVal;
2350         }
2351
2352         /**
2353          * Get an array of Title objects using this Title as a template
2354          * Also stores the IDs in the link cache.
2355          *
2356          * WARNING: do not use this function on arbitrary user-supplied titles!
2357          * On heavily-used templates it will max out the memory.
2358          *
2359          * @param string $options may be FOR UPDATE
2360          * @return array the Title objects linking here
2361          */
2362         public function getTemplateLinksTo( $options = '' ) {
2363                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2364         }
2365
2366         /**
2367          * Get an array of Title objects referring to non-existent articles linked from this page
2368          *
2369          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2370          * @param string $options may be FOR UPDATE
2371          * @return array the Title objects
2372          */
2373         public function getBrokenLinksFrom( $options = '' ) {
2374                 if ( $this->getArticleId() == 0 ) {
2375                         # All links from article ID 0 are false positives
2376                         return array();
2377                 }
2378
2379                 if ( $options ) {
2380                         $db = wfGetDB( DB_MASTER );
2381                 } else {
2382                         $db = wfGetDB( DB_SLAVE );
2383                 }
2384
2385                 $res = $db->safeQuery(
2386                           "SELECT pl_namespace, pl_title
2387                              FROM !
2388                         LEFT JOIN !
2389                                ON pl_namespace=page_namespace
2390                               AND pl_title=page_title
2391                             WHERE pl_from=?
2392                               AND page_namespace IS NULL
2393                                   !",
2394                         $db->tableName( 'pagelinks' ),
2395                         $db->tableName( 'page' ),
2396                         $this->getArticleId(),
2397                         $options );
2398
2399                 $retVal = array();
2400                 if ( $db->numRows( $res ) ) {
2401                         foreach( $res as $row ) {
2402                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2403                         }
2404                 }
2405                 $db->freeResult( $res );
2406                 return $retVal;
2407         }
2408
2409
2410         /**
2411          * Get a list of URLs to purge from the Squid cache when this
2412          * page changes
2413          *
2414          * @return array the URLs
2415          */
2416         public function getSquidURLs() {
2417                 global $wgContLang;
2418
2419                 $urls = array(
2420                         $this->getInternalURL(),
2421                         $this->getInternalURL( 'action=history' )
2422                 );
2423
2424                 // purge variant urls as well
2425                 if($wgContLang->hasVariants()){
2426                         $variants = $wgContLang->getVariants();
2427                         foreach($variants as $vCode){
2428                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2429                                 $urls[] = $this->getInternalURL('',$vCode);
2430                         }
2431                 }
2432
2433                 return $urls;
2434         }
2435
2436         public function purgeSquid() {
2437                 global $wgUseSquid;
2438                 if ( $wgUseSquid ) {
2439                         $urls = $this->getSquidURLs();
2440                         $u = new SquidUpdate( $urls );
2441                         $u->doUpdate();
2442                 }
2443         }
2444
2445         /**
2446          * Move this page without authentication
2447          * @param Title &$nt the new page Title
2448          */
2449         public function moveNoAuth( &$nt ) {
2450                 return $this->moveTo( $nt, false );
2451         }
2452
2453         /**
2454          * Check whether a given move operation would be valid.
2455          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2456          * @param Title &$nt the new title
2457          * @param bool $auth indicates whether $wgUser's permissions
2458          *      should be checked
2459          * @param string $reason is the log summary of the move, used for spam checking
2460          * @return mixed True on success, getUserPermissionsErrors()-like array on failure
2461          */
2462         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2463                 $errors = array();
2464                 if( !$nt ) {
2465                         // Normally we'd add this to $errors, but we'll get
2466                         // lots of syntax errors if $nt is not an object
2467                         return array(array('badtitletext'));
2468                 }
2469                 if( $this->equals( $nt ) ) {
2470                         $errors[] = array('selfmove');
2471                 }
2472                 if( !$this->isMovable() || !$nt->isMovable() ) {
2473                         $errors[] = array('immobile_namespace');
2474                 }
2475
2476                 $oldid = $this->getArticleID();
2477                 $newid = $nt->getArticleID();
2478
2479                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2480                         $errors[] = array('articleexists');
2481                 }
2482                 if ( ( '' == $this->getDBkey() ) ||
2483                          ( !$oldid ) ||
2484                      ( '' == $nt->getDBkey() ) ) {
2485                         $errors[] = array('badarticleerror');
2486                 }
2487
2488                 // Image-specific checks
2489                 if( $this->getNamespace() == NS_IMAGE ) {
2490                         $file = wfLocalFile( $this );
2491                         if( $file->exists() ) {
2492                                 if( $nt->getNamespace() != NS_IMAGE ) {
2493                                         $errors[] = array('imagenocrossnamespace');
2494                                 }
2495                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2496                                         $errors[] = array('imageinvalidfilename');
2497                                 }
2498                                 if( !File::checkExtensionCompatibility( $file, $nt->getDbKey() ) ) {
2499                                         $errors[] = array('imagetypemismatch');
2500                                 }
2501                         }
2502                 }
2503
2504                 if ( $auth ) {
2505                         global $wgUser;
2506                         $errors = array_merge($errors,
2507                                         $this->getUserPermissionsErrors('move', $wgUser),
2508                                         $this->getUserPermissionsErrors('edit', $wgUser),
2509                                         $nt->getUserPermissionsErrors('move', $wgUser),
2510                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2511                 }
2512
2513                 global $wgUser;
2514                 $err = null;
2515                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2516                         $errors[] = array('hookaborted', $err);
2517                 }
2518
2519                 # The move is allowed only if (1) the target doesn't exist, or
2520                 # (2) the target is a redirect to the source, and has no history
2521                 # (so we can undo bad moves right after they're done).
2522
2523                 if ( 0 != $newid ) { # Target exists; check for validity
2524                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2525                                 $errors[] = array('articleexists');
2526                         }
2527                 } else {
2528                         $tp = $nt->getTitleProtection();
2529                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2530                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2531                                 $errors[] = array('cantmove-titleprotected');
2532                         }
2533                 }
2534                 if(empty($errors))
2535                         return true;
2536                 return $errors;
2537         }
2538
2539         /**
2540          * Move a title to a new location
2541          * @param Title &$nt the new title
2542          * @param bool $auth indicates whether $wgUser's permissions
2543          *      should be checked
2544          * @param string $reason The reason for the move
2545          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2546          *  Ignored if the user doesn't have the suppressredirect right.
2547          * @return mixed true on success, getUserPermissionsErrors()-like array on failure
2548          */
2549         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2550                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2551                 if( is_array( $err ) ) {
2552                         return $err;
2553                 }
2554
2555                 $pageid = $this->getArticleID();
2556                 if( $nt->exists() ) {
2557                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2558                         $pageCountChange = ($createRedirect ? 0 : -1);
2559                 } else { # Target didn't exist, do normal move.
2560                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2561                         $pageCountChange = ($createRedirect ? 1 : 0);
2562                 }
2563
2564                 if( is_array( $err ) ) {
2565                         return $err;
2566                 }
2567                 $redirid = $this->getArticleID();
2568
2569                 // Category memberships include a sort key which may be customized.
2570                 // If it's left as the default (the page title), we need to update
2571                 // the sort key to match the new title.
2572                 //
2573                 // Be careful to avoid resetting cl_timestamp, which may disturb
2574                 // time-based lists on some sites.
2575                 //
2576                 // Warning -- if the sort key is *explicitly* set to the old title,
2577                 // we can't actually distinguish it from a default here, and it'll
2578                 // be set to the new title even though it really shouldn't.
2579                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2580                 $dbw = wfGetDB( DB_MASTER );
2581                 $dbw->update( 'categorylinks',
2582                         array(
2583                                 'cl_sortkey' => $nt->getPrefixedText(),
2584                                 'cl_timestamp=cl_timestamp' ),
2585                         array(
2586                                 'cl_from' => $pageid,
2587                                 'cl_sortkey' => $this->getPrefixedText() ),
2588                         __METHOD__ );
2589
2590                 # Update watchlists
2591
2592                 $oldnamespace = $this->getNamespace() & ~1;
2593                 $newnamespace = $nt->getNamespace() & ~1;
2594                 $oldtitle = $this->getDBkey();
2595                 $newtitle = $nt->getDBkey();
2596
2597                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2598                         WatchedItem::duplicateEntries( $this, $nt );
2599                 }
2600
2601                 # Update search engine
2602                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2603                 $u->doUpdate();
2604                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2605                 $u->doUpdate();
2606
2607                 # Update site_stats
2608                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2609                         # No longer a content page
2610                         # Not viewed, edited, removing
2611                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2612                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2613                         # Now a content page
2614                         # Not viewed, edited, adding
2615                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2616                 } elseif( $pageCountChange ) {
2617                         # Redirect added
2618                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2619                 } else {
2620                         # Nothing special
2621                         $u = false;
2622                 }
2623                 if( $u )
2624                         $u->doUpdate();
2625                 # Update message cache for interface messages
2626                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2627                         global $wgMessageCache;
2628                         $oldarticle = new Article( $this );
2629                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2630                         $newarticle = new Article( $nt );
2631                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2632                 }
2633
2634                 global $wgUser;
2635                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2636                 return true;
2637         }
2638
2639         /**
2640          * Move page to a title which is at present a redirect to the
2641          * source page
2642          *
2643          * @param Title &$nt the page to move to, which should currently
2644          *      be a redirect
2645          * @param string $reason The reason for the move
2646          * @param bool $createRedirect Whether to leave a redirect at the old title.
2647          *  Ignored if the user doesn't have the suppressredirect right
2648          */
2649         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2650                 global $wgUseSquid, $wgUser;
2651                 $fname = 'Title::moveOverExistingRedirect';
2652                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2653
2654                 if ( $reason ) {
2655                         $comment .= ": $reason";
2656                 }
2657
2658                 $now = wfTimestampNow();
2659                 $newid = $nt->getArticleID();
2660                 $oldid = $this->getArticleID();
2661                 $latest = $this->getLatestRevID();
2662
2663                 $dbw = wfGetDB( DB_MASTER );
2664                 $dbw->begin();
2665
2666                 # Delete the old redirect. We don't save it to history since
2667                 # by definition if we've got here it's rather uninteresting.
2668                 # We have to remove it so that the next step doesn't trigger
2669                 # a conflict on the unique namespace+title index...
2670                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2671                 if ( !$dbw->cascadingDeletes() ) {
2672                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2673                         global $wgUseTrackbacks;
2674                         if ($wgUseTrackbacks)
2675                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2676                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2677                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2678                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2679                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2680                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2681                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2682                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2683                 }
2684
2685                 # Save a null revision in the page's history notifying of the move
2686                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2687                 $nullRevId = $nullRevision->insertOn( $dbw );
2688
2689                 $article = new Article( $this );
2690                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2691
2692                 # Change the name of the target page:
2693                 $dbw->update( 'page',
2694                         /* SET */ array(
2695                                 'page_touched'   => $dbw->timestamp($now),
2696                                 'page_namespace' => $nt->getNamespace(),
2697                                 'page_title'     => $nt->getDBkey(),
2698                                 'page_latest'    => $nullRevId,
2699                         ),
2700                         /* WHERE */ array( 'page_id' => $oldid ),
2701                         $fname
2702                 );
2703                 $nt->resetArticleID( $oldid );
2704
2705                 # Recreate the redirect, this time in the other direction.
2706                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2707                         $mwRedir = MagicWord::get( 'redirect' );
2708                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2709                         $redirectArticle = new Article( $this );
2710                         $newid = $redirectArticle->insertOn( $dbw );
2711                         $redirectRevision = new Revision( array(
2712                                 'page'    => $newid,
2713                                 'comment' => $comment,
2714                                 'text'    => $redirectText ) );
2715                         $redirectRevision->insertOn( $dbw );
2716                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2717
2718                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2719
2720                         # Now, we record the link from the redirect to the new title.
2721                         # It should have no other outgoing links...
2722                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2723                         $dbw->insert( 'pagelinks',
2724                                 array(
2725                                         'pl_from'      => $newid,
2726                                         'pl_namespace' => $nt->getNamespace(),
2727                                         'pl_title'     => $nt->getDBkey() ),
2728                                 $fname );
2729                 } else {
2730                         $this->resetArticleID( 0 );
2731                 }
2732
2733                 # Move an image if this is a file
2734                 if( $this->getNamespace() == NS_IMAGE ) {
2735                         $file = wfLocalFile( $this );
2736                         if( $file->exists() ) {
2737                                 $status = $file->move( $nt );
2738                                 if( !$status->isOk() ) {
2739                                         $dbw->rollback();
2740                                         return $status->getErrorsArray();
2741                                 }
2742                         }
2743                 }
2744                 $dbw->commit();
2745
2746                 # Log the move
2747                 $log = new LogPage( 'move' );
2748                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2749
2750                 # Purge squid
2751                 if ( $wgUseSquid ) {
2752                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2753                         $u = new SquidUpdate( $urls );
2754                         $u->doUpdate();
2755                 }
2756
2757         }
2758
2759         /**
2760          * Move page to non-existing title.
2761          * @param Title &$nt the new Title
2762          * @param string $reason The reason for the move
2763          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2764          *  Ignored if the user doesn't have the suppressredirect right
2765          */
2766         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2767                 global $wgUseSquid, $wgUser;
2768                 $fname = 'MovePageForm::moveToNewTitle';
2769                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2770                 if ( $reason ) {
2771                         $comment .= ": $reason";
2772                 }
2773
2774                 $newid = $nt->getArticleID();
2775                 $oldid = $this->getArticleID();
2776                 $latest = $this->getLatestRevId();
2777
2778                 $dbw = wfGetDB( DB_MASTER );
2779                 $dbw->begin();
2780                 $now = $dbw->timestamp();
2781
2782                 # Save a null revision in the page's history notifying of the move
2783                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2784                 $nullRevId = $nullRevision->insertOn( $dbw );
2785
2786                 $article = new Article( $this );
2787                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest) );
2788
2789                 # Rename page entry
2790                 $dbw->update( 'page',
2791                         /* SET */ array(
2792                                 'page_touched'   => $now,
2793                                 'page_namespace' => $nt->getNamespace(),
2794                                 'page_title'     => $nt->getDBkey(),
2795                                 'page_latest'    => $nullRevId,
2796                         ),
2797                         /* WHERE */ array( 'page_id' => $oldid ),
2798                         $fname
2799                 );
2800                 $nt->resetArticleID( $oldid );
2801
2802                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2803                         # Insert redirect
2804                         $mwRedir = MagicWord::get( 'redirect' );
2805                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2806                         $redirectArticle = new Article( $this );
2807                         $newid = $redirectArticle->insertOn( $dbw );
2808                         $redirectRevision = new Revision( array(
2809                                 'page'    => $newid,
2810                                 'comment' => $comment,
2811                                 'text'    => $redirectText ) );
2812                         $redirectRevision->insertOn( $dbw );
2813                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2814
2815                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false) );
2816
2817                         # Record the just-created redirect's linking to the page
2818                         $dbw->insert( 'pagelinks',
2819                                 array(
2820                                         'pl_from'      => $newid,
2821                                         'pl_namespace' => $nt->getNamespace(),
2822                                         'pl_title'     => $nt->getDBkey() ),
2823                                 $fname );
2824                 } else {
2825                         $this->resetArticleID( 0 );
2826                 }
2827
2828                 # Move an image if this is a file
2829                 if( $this->getNamespace() == NS_IMAGE ) {
2830                         $file = wfLocalFile( $this );
2831                         if( $file->exists() ) {
2832                                 $status = $file->move( $nt );
2833                                 if( !$status->isOk() ) {
2834                                         $dbw->rollback();
2835                                         return $status->getErrorsArray();
2836                                 }
2837                         }
2838                 }
2839                 $dbw->commit();
2840
2841                 # Log the move
2842                 $log = new LogPage( 'move' );
2843                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2844
2845                 # Purge caches as per article creation
2846                 Article::onArticleCreate( $nt );
2847
2848                 # Purge old title from squid
2849                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2850                 $this->purgeSquid();
2851
2852         }
2853
2854         /**
2855          * Checks if $this can be moved to a given Title
2856          * - Selects for update, so don't call it unless you mean business
2857          *
2858          * @param Title &$nt the new title to check
2859          */
2860         public function isValidMoveTarget( $nt ) {
2861
2862                 $fname = 'Title::isValidMoveTarget';
2863                 $dbw = wfGetDB( DB_MASTER );
2864
2865                 # Is it an existsing file?
2866                 if( $nt->getNamespace() == NS_IMAGE ) {
2867                         $file = wfLocalFile( $nt );
2868                         if( $file->exists() ) {
2869                                 wfDebug( __METHOD__ . ": file exists\n" );
2870                                 return false;
2871                         }
2872                 }
2873
2874                 # Is it a redirect?
2875                 $id  = $nt->getArticleID();
2876                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2877                         array( 'page_is_redirect','old_text','old_flags' ),
2878                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2879                         $fname, 'FOR UPDATE' );
2880
2881                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2882                         # Not a redirect
2883                         wfDebug( __METHOD__ . ": not a redirect\n" );
2884                         return false;
2885                 }
2886                 $text = Revision::getRevisionText( $obj );
2887
2888                 # Does the redirect point to the source?
2889                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2890                 $m = array();
2891                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2892                         $redirTitle = Title::newFromText( $m[1] );
2893                         if( !is_object( $redirTitle ) ||
2894                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2895                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2896                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2897                                 return false;
2898                         }
2899                 } else {
2900                         # Fail safe
2901                         wfDebug( __METHOD__ . ": failsafe\n" );
2902                         return false;
2903                 }
2904
2905                 # Does the article have a history?
2906                 $row = $dbw->selectRow( array( 'page', 'revision'),
2907                         array( 'rev_id' ),
2908                         array( 'page_namespace' => $nt->getNamespace(),
2909                                 'page_title' => $nt->getDBkey(),
2910                                 'page_id=rev_page AND page_latest != rev_id'
2911                         ), $fname, 'FOR UPDATE'
2912                 );
2913
2914                 # Return true if there was no history
2915                 return $row === false;
2916         }
2917
2918         /**
2919          * Can this title be added to a user's watchlist?
2920          *
2921          * @return bool
2922          */
2923         public function isWatchable() {
2924                 return !$this->isExternal()
2925                         && MWNamespace::isWatchable( $this->getNamespace() );
2926         }
2927
2928         /**
2929          * Get categories to which this Title belongs and return an array of
2930          * categories' names.
2931          *
2932          * @return array an array of parents in the form:
2933          *      $parent => $currentarticle
2934          */
2935         public function getParentCategories() {
2936                 global $wgContLang;
2937
2938                 $titlekey = $this->getArticleId();
2939                 $dbr = wfGetDB( DB_SLAVE );
2940                 $categorylinks = $dbr->tableName( 'categorylinks' );
2941
2942                 # NEW SQL
2943                 $sql = "SELECT * FROM $categorylinks"
2944                      ." WHERE cl_from='$titlekey'"
2945                          ." AND cl_from <> '0'"
2946                          ." ORDER BY cl_sortkey";
2947
2948                 $res = $dbr->query( $sql );
2949
2950                 if( $dbr->numRows( $res ) > 0 ) {
2951                         foreach( $res as $row )
2952                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
2953                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
2954                         $dbr->freeResult( $res );
2955                 } else {
2956                         $data = array();
2957                 }
2958                 return $data;
2959         }
2960
2961         /**
2962          * Get a tree of parent categories
2963          * @param array $children an array with the children in the keys, to check for circular refs
2964          * @return array
2965          */
2966         public function getParentCategoryTree( $children = array() ) {
2967                 $stack = array();
2968                 $parents = $this->getParentCategories();
2969
2970                 if( $parents ) {
2971                         foreach( $parents as $parent => $current ) {
2972                                 if ( array_key_exists( $parent, $children ) ) {
2973                                         # Circular reference
2974                                         $stack[$parent] = array();
2975                                 } else {
2976                                         $nt = Title::newFromText($parent);
2977                                         if ( $nt ) {
2978                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2979                                         }
2980                                 }
2981                         }
2982                         return $stack;
2983                 } else {
2984                         return array();
2985                 }
2986         }
2987
2988
2989         /**
2990          * Get an associative array for selecting this title from
2991          * the "page" table
2992          *
2993          * @return array
2994          */
2995         public function pageCond() {
2996                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2997         }
2998
2999         /**
3000          * Get the revision ID of the previous revision
3001          *
3002          * @param integer $revId Revision ID. Get the revision that was before this one.
3003          * @param integer $flags, GAID_FOR_UPDATE
3004          * @return integer $oldrevision|false
3005          */
3006         public function getPreviousRevisionID( $revId, $flags=0 ) {
3007                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3008                 return $db->selectField( 'revision', 'rev_id',
3009                         array(
3010                                 'rev_page' => $this->getArticleId($flags),
3011                                 'rev_id < ' . intval( $revId )
3012                         ),
3013                         __METHOD__,
3014                         array( 'ORDER BY' => 'rev_id DESC' )
3015                 );
3016         }
3017
3018         /**
3019          * Get the revision ID of the next revision
3020          *
3021          * @param integer $revId Revision ID. Get the revision that was after this one.
3022          * @param integer $flags, GAID_FOR_UPDATE
3023          * @return integer $oldrevision|false
3024          */
3025         public function getNextRevisionID( $revId, $flags=0 ) {
3026                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3027                 return $db->selectField( 'revision', 'rev_id',
3028                         array(
3029                                 'rev_page' => $this->getArticleId($flags),
3030                                 'rev_id > ' . intval( $revId )
3031                         ),
3032                         __METHOD__,
3033                         array( 'ORDER BY' => 'rev_id' )
3034                 );
3035         }
3036
3037         /**
3038          * Get the number of revisions between the given revision IDs.
3039          * Used for diffs and other things that really need it.
3040          *
3041          * @param integer $old  Revision ID.
3042          * @param integer $new  Revision ID.
3043          * @return integer  Number of revisions between these IDs.
3044          */
3045         public function countRevisionsBetween( $old, $new ) {
3046                 $dbr = wfGetDB( DB_SLAVE );
3047                 return $dbr->selectField( 'revision', 'count(*)',
3048                         'rev_page = ' . intval( $this->getArticleId() ) .
3049                         ' AND rev_id > ' . intval( $old ) .
3050                         ' AND rev_id < ' . intval( $new ),
3051                         __METHOD__,
3052                         array( 'USE INDEX' => 'PRIMARY' ) );
3053         }
3054
3055         /**
3056          * Compare with another title.
3057          *
3058          * @param Title $title
3059          * @return bool
3060          */
3061         public function equals( Title $title ) {
3062                 // Note: === is necessary for proper matching of number-like titles.
3063                 return $this->getInterwiki() === $title->getInterwiki()
3064                         && $this->getNamespace() == $title->getNamespace()
3065                         && $this->getDBkey() === $title->getDBkey();
3066         }
3067
3068         /**
3069          * Callback for usort() to do title sorts by (namespace, title)
3070          */
3071         static function compare( $a, $b ) {
3072                 if( $a->getNamespace() == $b->getNamespace() ) {
3073                         return strcmp( $a->getText(), $b->getText() );
3074                 } else {
3075                         return $a->getNamespace() - $b->getNamespace();
3076                 }
3077         }
3078
3079         /**
3080          * Return a string representation of this title
3081          *
3082          * @return string
3083          */
3084         public function __toString() {
3085                 return $this->getPrefixedText();
3086         }
3087
3088         /**
3089          * Check if page exists
3090          * @return bool
3091          */
3092         public function exists() {
3093                 return $this->getArticleId() != 0;
3094         }
3095
3096         /**
3097          * Do we know that this title definitely exists, or should we otherwise
3098          * consider that it exists?
3099          *
3100          * @return bool
3101          */
3102         public function isAlwaysKnown() {
3103                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3104                 // the full l10n of that language to be loaded. That takes much memory and
3105                 // isn't needed. So we strip the language part away.
3106                 // Also, extension messages which are not loaded, are shown as red, because
3107                 // we don't call MessageCache::loadAllMessages.
3108                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3109                 return $this->isExternal()
3110                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
3111                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
3112         }
3113
3114         /**
3115          * Update page_touched timestamps and send squid purge messages for
3116          * pages linking to this title. May be sent to the job queue depending
3117          * on the number of links. Typically called on create and delete.
3118          */
3119         public function touchLinks() {
3120                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3121                 $u->doUpdate();
3122
3123                 if ( $this->getNamespace() == NS_CATEGORY ) {
3124                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3125                         $u->doUpdate();
3126                 }
3127         }
3128
3129         /**
3130          * Get the last touched timestamp
3131          */
3132         public function getTouched() {
3133                 $dbr = wfGetDB( DB_SLAVE );
3134                 $touched = $dbr->selectField( 'page', 'page_touched',
3135                         array(
3136                                 'page_namespace' => $this->getNamespace(),
3137                                 'page_title' => $this->getDBkey()
3138                         ), __METHOD__
3139                 );
3140                 return $touched;
3141         }
3142
3143         public function trackbackURL() {
3144                 global $wgTitle, $wgScriptPath, $wgServer;
3145
3146                 return "$wgServer$wgScriptPath/trackback.php?article="
3147                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
3148         }
3149
3150         public function trackbackRDF() {
3151                 $url = htmlspecialchars($this->getFullURL());
3152                 $title = htmlspecialchars($this->getText());
3153                 $tburl = $this->trackbackURL();
3154
3155                 // Autodiscovery RDF is placed in comments so HTML validator
3156                 // won't barf. This is a rather icky workaround, but seems
3157                 // frequently used by this kind of RDF thingy.
3158                 //
3159                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3160                 return "<!--
3161 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3162          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3163          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3164 <rdf:Description
3165    rdf:about=\"$url\"
3166    dc:identifier=\"$url\"
3167    dc:title=\"$title\"
3168    trackback:ping=\"$tburl\" />
3169 </rdf:RDF>
3170 -->";
3171         }
3172
3173         /**
3174          * Generate strings used for xml 'id' names in monobook tabs
3175          * @return string
3176          */
3177         public function getNamespaceKey() {
3178                 global $wgContLang;
3179                 switch ($this->getNamespace()) {
3180                         case NS_MAIN:
3181                         case NS_TALK:
3182                                 return 'nstab-main';
3183                         case NS_USER:
3184                         case NS_USER_TALK:
3185                                 return 'nstab-user';
3186                         case NS_MEDIA:
3187                                 return 'nstab-media';
3188                         case NS_SPECIAL:
3189                                 return 'nstab-special';
3190                         case NS_PROJECT:
3191                         case NS_PROJECT_TALK:
3192                                 return 'nstab-project';
3193                         case NS_IMAGE:
3194                         case NS_IMAGE_TALK:
3195                                 return 'nstab-image';
3196                         case NS_MEDIAWIKI:
3197                         case NS_MEDIAWIKI_TALK:
3198                                 return 'nstab-mediawiki';
3199                         case NS_TEMPLATE:
3200                         case NS_TEMPLATE_TALK:
3201                                 return 'nstab-template';
3202                         case NS_HELP:
3203                         case NS_HELP_TALK:
3204                                 return 'nstab-help';
3205                         case NS_CATEGORY:
3206                         case NS_CATEGORY_TALK:
3207                                 return 'nstab-category';
3208                         default:
3209                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3210                 }
3211         }
3212
3213         /**
3214          * Returns true if this title resolves to the named special page
3215          * @param string $name The special page name
3216          */
3217         public function isSpecial( $name ) {
3218                 if ( $this->getNamespace() == NS_SPECIAL ) {
3219                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3220                         if ( $name == $thisName ) {
3221                                 return true;
3222                         }
3223                 }
3224                 return false;
3225         }
3226
3227         /**
3228          * If the Title refers to a special page alias which is not the local default,
3229          * returns a new Title which points to the local default. Otherwise, returns $this.
3230          */
3231         public function fixSpecialName() {
3232                 if ( $this->getNamespace() == NS_SPECIAL ) {
3233                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3234                         if ( $canonicalName ) {
3235                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3236                                 if ( $localName != $this->mDbkeyform ) {
3237                                         return Title::makeTitle( NS_SPECIAL, $localName );
3238                                 }
3239                         }
3240                 }
3241                 return $this;
3242         }
3243
3244         /**
3245          * Is this Title in a namespace which contains content?
3246          * In other words, is this a content page, for the purposes of calculating
3247          * statistics, etc?
3248          *
3249          * @return bool
3250          */
3251         public function isContentPage() {
3252                 return MWNamespace::isContent( $this->getNamespace() );
3253         }
3254
3255         public function getRedirectsHere( $ns = null ) {
3256                 $redirs = array();
3257
3258                 $dbr = wfGetDB( DB_SLAVE );
3259                 $where = array(
3260                         'rd_namespace' => $this->getNamespace(),
3261                         'rd_title' => $this->getDBkey(),
3262                         'rd_from = page_id'
3263                 );
3264                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3265
3266                 $res = $dbr->select(
3267                         array( 'redirect', 'page' ),
3268                         array( 'page_namespace', 'page_title' ),
3269                         $where,
3270                         __METHOD__
3271                 );
3272
3273
3274                 foreach( $res as $row ) {
3275                         $redirs[] = self::newFromRow( $row );
3276                 }
3277                 return $redirs;
3278         }
3279 }