includes/Title.php

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