includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13 # Title::newFromTitle maintains a cache to avoid
  14 # expensive re-normalization of commonly used titles.
  15 # On a batch operation this can become a memory leak
  16 # if not bounded. After hitting this many titles,
  17 # reset the cache.
  18 define( 'MW_TITLECACHE_MAX', 1000 );
  19
  20 # Constants for pr_cascade bitfield
  21 define( 'CASCADE', 1 );
  22
  23 /**
  24  * Title class
  25  * - Represents a title, which may contain an interwiki designation or namespace
  26  * - Can fetch various kinds of data from the database, albeit inefficiently.
  27  *
  28  * @package MediaWiki
  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 $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  51         var $mInterwiki;                # Interwiki prefix (or null string)
  52         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  53         var $mArticleID;                # Article ID, fetched from the link cache on demand
  54         var $mLatestID;                 # ID of most recent revision
  55         var $mRestrictions;             # Array of groups allowed to edit this article
  56         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  57         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  58         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  59         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  60         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  61         var $mDefaultNamespace;         # Namespace index when there is no namespace
  62                                         # Zero except in {{transclusion}} tags
  63         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  64         /**#@-*/
  65
  66
  67         /**
  68          * Constructor
  69          * @private
  70          */
  71         /* private */ function Title() {
  72                 $this->mInterwiki = $this->mUrlform =
  73                 $this->mTextform = $this->mDbkeyform = '';
  74                 $this->mArticleID = -1;
  75                 $this->mNamespace = NS_MAIN;
  76                 $this->mRestrictionsLoaded = false;
  77                 $this->mRestrictions = array();
  78                 # Dont change the following, NS_MAIN is hardcoded in several place
  79                 # See bug #696
  80                 $this->mDefaultNamespace = NS_MAIN;
  81                 $this->mWatched = NULL;
  82                 $this->mLatestID = false;
  83                 $this->mOldRestrictions = false;
  84         }
  85
  86         /**
  87          * Create a new Title from a prefixed DB key
  88          * @param string $key The database key, which has underscores
  89          *      instead of spaces, possibly including namespace and
  90          *      interwiki prefixes
  91          * @return Title the new object, or NULL on an error
  92          * @static
  93          * @access public
  94          */
  95         /* 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          * @static
 115          * @access public
 116          */
 117         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 118                 if( is_object( $text ) ) {
 119                         throw new MWException( 'Title::newFromText given an object' );
 120                 }
 121
 122                 /**
 123                  * Wiki pages often contain multiple links to the same page.
 124                  * Title normalization and parsing can become expensive on
 125                  * pages with many links, so we can save a little time by
 126                  * caching them.
 127                  *
 128                  * In theory these are value objects and won't get changed...
 129                  */
 130                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 131                         return Title::$titleCache[$text];
 132                 }
 133
 134                 /**
 135                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 136                  */
 137                 $filteredText = Sanitizer::decodeCharReferences( $text );
 138
 139                 $t = new Title();
 140                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 141                 $t->mDefaultNamespace = $defaultNamespace;
 142
 143                 static $cachedcount = 0 ;
 144                 if( $t->secureAndSplit() ) {
 145                         if( $defaultNamespace == NS_MAIN ) {
 146                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 147                                         # Avoid memory leaks on mass operations...
 148                                         Title::$titleCache = array();
 149                                         $cachedcount=0;
 150                                 }
 151                                 $cachedcount++;
 152                                 Title::$titleCache[$text] =& $t;
 153                         }
 154                         return $t;
 155                 } else {
 156                         $ret = NULL;
 157                         return $ret;
 158                 }
 159         }
 160
 161         /**
 162          * Create a new Title from URL-encoded text. Ensures that
 163          * the given title's length does not exceed the maximum.
 164          * @param string $url the title, as might be taken from a URL
 165          * @return Title the new object, or NULL on an error
 166          * @static
 167          * @access public
 168          */
 169         public static function newFromURL( $url ) {
 170                 global $wgLegalTitleChars;
 171                 $t = new Title();
 172
 173                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 174                 # but some URLs used it as a space replacement and they still come
 175                 # from some external search tools.
 176                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 177                         $url = str_replace( '+', ' ', $url );
 178                 }
 179
 180                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 181                 if( $t->secureAndSplit() ) {
 182                         return $t;
 183                 } else {
 184                         return NULL;
 185                 }
 186         }
 187
 188         /**
 189          * Create a new Title from an article ID
 190          *
 191          * @todo This is inefficiently implemented, the page row is requested
 192          *       but not used for anything else
 193          *
 194          * @param int $id the page_id corresponding to the Title to create
 195          * @return Title the new object, or NULL on an error
 196          * @access public
 197          * @static
 198          */
 199         public static function newFromID( $id ) {
 200                 $fname = 'Title::newFromID';
 201                 $dbr =& wfGetDB( DB_SLAVE );
 202                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 203                         array( 'page_id' => $id ), $fname );
 204                 if ( $row !== false ) {
 205                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 206                 } else {
 207                         $title = NULL;
 208                 }
 209                 return $title;
 210         }
 211
 212         /**
 213          * Make an array of titles from an array of IDs
 214          */
 215         function newFromIDs( $ids ) {
 216                 $dbr =& wfGetDB( DB_SLAVE );
 217                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 218                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 219
 220                 $titles = array();
 221                 while ( $row = $dbr->fetchObject( $res ) ) {
 222                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 223                 }
 224                 return $titles;
 225         }
 226
 227         /**
 228          * Create a new Title from a namespace index and a DB key.
 229          * It's assumed that $ns and $title are *valid*, for instance when
 230          * they came directly from the database or a special page name.
 231          * For convenience, spaces are converted to underscores so that
 232          * eg user_text fields can be used directly.
 233          *
 234          * @param int $ns the namespace of the article
 235          * @param string $title the unprefixed database key form
 236          * @return Title the new object
 237          * @static
 238          * @access public
 239          */
 240         public static function &makeTitle( $ns, $title ) {
 241                 $t = new Title();
 242                 $t->mInterwiki = '';
 243                 $t->mFragment = '';
 244                 $t->mNamespace = intval( $ns );
 245                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 246                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 247                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 248                 $t->mTextform = str_replace( '_', ' ', $title );
 249                 return $t;
 250         }
 251
 252         /**
 253          * Create a new Title from a namespace index and a DB key.
 254          * The parameters will be checked for validity, which is a bit slower
 255          * than makeTitle() but safer for user-provided data.
 256          *
 257          * @param int $ns the namespace of the article
 258          * @param string $title the database key form
 259          * @return Title the new object, or NULL on an error
 260          * @static
 261          * @access public
 262          */
 263         public static function makeTitleSafe( $ns, $title ) {
 264                 $t = new Title();
 265                 $t->mDbkeyform = Title::makeName( $ns, $title );
 266                 if( $t->secureAndSplit() ) {
 267                         return $t;
 268                 } else {
 269                         return NULL;
 270                 }
 271         }
 272
 273         /**
 274          * Create a new Title for the Main Page
 275          *
 276          * @static
 277          * @return Title the new object
 278          * @access public
 279          */
 280         public static function newMainPage() {
 281                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 282         }
 283
 284         /**
 285          * Create a new Title for a redirect
 286          * @param string $text the redirect title text
 287          * @return Title the new object, or NULL if the text is not a
 288          *      valid redirect
 289          */
 290         public static function newFromRedirect( $text ) {
 291                 $mwRedir = MagicWord::get( 'redirect' );
 292                 $rt = NULL;
 293                 if ( $mwRedir->matchStart( $text ) ) {
 294                         $m = array();
 295                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 296                                 # categories are escaped using : for example one can enter:
 297                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 298                                 if ( substr($m[1],0,1) == ':') {
 299                                         # We don't want to keep the ':'
 300                                         $m[1] = substr( $m[1], 1 );
 301                                 }
 302
 303                                 $rt = Title::newFromText( $m[1] );
 304                                 # Disallow redirects to Special:Userlogout
 305                                 if ( !is_null($rt) && $rt->isSpecial( 'Userlogout' ) ) {
 306                                         $rt = NULL;
 307                                 }
 308                         }
 309                 }
 310                 return $rt;
 311         }
 312
 313 #----------------------------------------------------------------------------
 314 #       Static functions
 315 #----------------------------------------------------------------------------
 316
 317         /**
 318          * Get the prefixed DB key associated with an ID
 319          * @param int $id the page_id of the article
 320          * @return Title an object representing the article, or NULL
 321          *      if no such article was found
 322          * @static
 323          * @access public
 324          */
 325         function nameOf( $id ) {
 326                 $fname = 'Title::nameOf';
 327                 $dbr =& wfGetDB( DB_SLAVE );
 328
 329                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 330                 if ( $s === false ) { return NULL; }
 331
 332                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 333                 return $n;
 334         }
 335
 336         /**
 337          * Get a regex character class describing the legal characters in a link
 338          * @return string the list of characters, not delimited
 339          * @static
 340          * @access public
 341          */
 342         public static function legalChars() {
 343                 global $wgLegalTitleChars;
 344                 return $wgLegalTitleChars;
 345         }
 346
 347         /**
 348          * Get a string representation of a title suitable for
 349          * including in a search index
 350          *
 351          * @param int $ns a namespace index
 352          * @param string $title text-form main part
 353          * @return string a stripped-down title string ready for the
 354          *      search index
 355          */
 356         public static function indexTitle( $ns, $title ) {
 357                 global $wgContLang;
 358
 359                 $lc = SearchEngine::legalSearchChars() . '&#;';
 360                 $t = $wgContLang->stripForSearch( $title );
 361                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 362                 $t = $wgContLang->lc( $t );
 363
 364                 # Handle 's, s'
 365                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 366                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 367
 368                 $t = preg_replace( "/\\s+/", ' ', $t );
 369
 370                 if ( $ns == NS_IMAGE ) {
 371                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 372                 }
 373                 return trim( $t );
 374         }
 375
 376         /*
 377          * Make a prefixed DB key from a DB key and a namespace index
 378          * @param int $ns numerical representation of the namespace
 379          * @param string $title the DB key form the title
 380          * @return string the prefixed form of the title
 381          */
 382         public static function makeName( $ns, $title ) {
 383                 global $wgContLang;
 384
 385                 $n = $wgContLang->getNsText( $ns );
 386                 return $n == '' ? $title : "$n:$title";
 387         }
 388
 389         /**
 390          * Returns the URL associated with an interwiki prefix
 391          * @param string $key the interwiki prefix (e.g. "MeatBall")
 392          * @return the associated URL, containing "$1", which should be
 393          *      replaced by an article title
 394          * @static (arguably)
 395          * @access public
 396          */
 397         function getInterwikiLink( $key )  {
 398                 global $wgMemc, $wgInterwikiExpiry;
 399                 global $wgInterwikiCache, $wgContLang;
 400                 $fname = 'Title::getInterwikiLink';
 401
 402                 $key = $wgContLang->lc( $key );
 403
 404                 $k = wfMemcKey( 'interwiki', $key );
 405                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 406                         return Title::$interwikiCache[$k]->iw_url;
 407                 }
 408
 409                 if ($wgInterwikiCache) {
 410                         return Title::getInterwikiCached( $key );
 411                 }
 412
 413                 $s = $wgMemc->get( $k );
 414                 # Ignore old keys with no iw_local
 415                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 416                         Title::$interwikiCache[$k] = $s;
 417                         return $s->iw_url;
 418                 }
 419
 420                 $dbr =& wfGetDB( DB_SLAVE );
 421                 $res = $dbr->select( 'interwiki',
 422                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 423                         array( 'iw_prefix' => $key ), $fname );
 424                 if( !$res ) {
 425                         return '';
 426                 }
 427
 428                 $s = $dbr->fetchObject( $res );
 429                 if( !$s ) {
 430                         # Cache non-existence: create a blank object and save it to memcached
 431                         $s = (object)false;
 432                         $s->iw_url = '';
 433                         $s->iw_local = 0;
 434                         $s->iw_trans = 0;
 435                 }
 436                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 437                 Title::$interwikiCache[$k] = $s;
 438
 439                 return $s->iw_url;
 440         }
 441
 442         /**
 443          * Fetch interwiki prefix data from local cache in constant database
 444          *
 445          * More logic is explained in DefaultSettings
 446          *
 447          * @return string URL of interwiki site
 448          * @access public
 449          */
 450         function getInterwikiCached( $key ) {
 451                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 452                 static $db, $site;
 453
 454                 if (!$db)
 455                         $db=dba_open($wgInterwikiCache,'r','cdb');
 456                 /* Resolve site name */
 457                 if ($wgInterwikiScopes>=3 and !$site) {
 458                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 459                         if ($site=="")
 460                                 $site = $wgInterwikiFallbackSite;
 461                 }
 462                 $value = dba_fetch( wfMemcKey( $key ), $db);
 463                 if ($value=='' and $wgInterwikiScopes>=3) {
 464                         /* try site-level */
 465                         $value = dba_fetch("_{$site}:{$key}", $db);
 466                 }
 467                 if ($value=='' and $wgInterwikiScopes>=2) {
 468                         /* try globals */
 469                         $value = dba_fetch("__global:{$key}", $db);
 470                 }
 471                 if ($value=='undef')
 472                         $value='';
 473                 $s = (object)false;
 474                 $s->iw_url = '';
 475                 $s->iw_local = 0;
 476                 $s->iw_trans = 0;
 477                 if ($value!='') {
 478                         list($local,$url)=explode(' ',$value,2);
 479                         $s->iw_url=$url;
 480                         $s->iw_local=(int)$local;
 481                 }
 482                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 483                 return $s->iw_url;
 484         }
 485         /**
 486          * Determine whether the object refers to a page within
 487          * this project.
 488          *
 489          * @return bool TRUE if this is an in-project interwiki link
 490          *      or a wikilink, FALSE otherwise
 491          * @access public
 492          */
 493         function isLocal() {
 494                 if ( $this->mInterwiki != '' ) {
 495                         # Make sure key is loaded into cache
 496                         $this->getInterwikiLink( $this->mInterwiki );
 497                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 498                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 499                 } else {
 500                         return true;
 501                 }
 502         }
 503
 504         /**
 505          * Determine whether the object refers to a page within
 506          * this project and is transcludable.
 507          *
 508          * @return bool TRUE if this is transcludable
 509          * @access public
 510          */
 511         function isTrans() {
 512                 if ($this->mInterwiki == '')
 513                         return false;
 514                 # Make sure key is loaded into cache
 515                 $this->getInterwikiLink( $this->mInterwiki );
 516                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 517                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 518         }
 519
 520         /**
 521          * Update the page_touched field for an array of title objects
 522          * @todo Inefficient unless the IDs are already loaded into the
 523          *      link cache
 524          * @param array $titles an array of Title objects to be touched
 525          * @param string $timestamp the timestamp to use instead of the
 526          *      default current time
 527          * @static
 528          * @access public
 529          */
 530         function touchArray( $titles, $timestamp = '' ) {
 531
 532                 if ( count( $titles ) == 0 ) {
 533                         return;
 534                 }
 535                 $dbw =& wfGetDB( DB_MASTER );
 536                 if ( $timestamp == '' ) {
 537                         $timestamp = $dbw->timestamp();
 538                 }
 539                 /*
 540                 $page = $dbw->tableName( 'page' );
 541                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 542                 $first = true;
 543
 544                 foreach ( $titles as $title ) {
 545                         if ( $wgUseFileCache ) {
 546                                 $cm = new HTMLFileCache($title);
 547                                 @unlink($cm->fileCacheName());
 548                         }
 549
 550                         if ( ! $first ) {
 551                                 $sql .= ',';
 552                         }
 553                         $first = false;
 554                         $sql .= $title->getArticleID();
 555                 }
 556                 $sql .= ')';
 557                 if ( ! $first ) {
 558                         $dbw->query( $sql, 'Title::touchArray' );
 559                 }
 560                 */
 561                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 562                 // do them in small chunks:
 563                 $fname = 'Title::touchArray';
 564                 foreach( $titles as $title ) {
 565                         $dbw->update( 'page',
 566                                 array( 'page_touched' => $timestamp ),
 567                                 array(
 568                                         'page_namespace' => $title->getNamespace(),
 569                                         'page_title'     => $title->getDBkey() ),
 570                                 $fname );
 571                 }
 572         }
 573
 574         /**
 575          * Escape a text fragment, say from a link, for a URL
 576          */
 577         static function escapeFragmentForURL( $fragment ) {
 578                 $fragment = str_replace( ' ', '_', $fragment );
 579                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 580                 $replaceArray = array(
 581                         '%3A' => ':',
 582                         '%' => '.'
 583                 );
 584                 return strtr( $fragment, $replaceArray );
 585         }
 586
 587 #----------------------------------------------------------------------------
 588 #       Other stuff
 589 #----------------------------------------------------------------------------
 590
 591         /** Simple accessors */
 592         /**
 593          * Get the text form (spaces not underscores) of the main part
 594          * @return string
 595          * @access public
 596          */
 597         function getText() { return $this->mTextform; }
 598         /**
 599          * Get the URL-encoded form of the main part
 600          * @return string
 601          * @access public
 602          */
 603         function getPartialURL() { return $this->mUrlform; }
 604         /**
 605          * Get the main part with underscores
 606          * @return string
 607          * @access public
 608          */
 609         function getDBkey() { return $this->mDbkeyform; }
 610         /**
 611          * Get the namespace index, i.e. one of the NS_xxxx constants
 612          * @return int
 613          * @access public
 614          */
 615         function getNamespace() { return $this->mNamespace; }
 616         /**
 617          * Get the namespace text
 618          * @return string
 619          * @access public
 620          */
 621         function getNsText() {
 622                 global $wgContLang, $wgCanonicalNamespaceNames;
 623
 624                 if ( '' != $this->mInterwiki ) {
 625                         // This probably shouldn't even happen. ohh man, oh yuck.
 626                         // But for interwiki transclusion it sometimes does.
 627                         // Shit. Shit shit shit.
 628                         //
 629                         // Use the canonical namespaces if possible to try to
 630                         // resolve a foreign namespace.
 631                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 632                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 633                         }
 634                 }
 635                 return $wgContLang->getNsText( $this->mNamespace );
 636         }
 637         /**
 638          * Get the namespace text of the subject (rather than talk) page
 639          * @return string
 640          * @access public
 641          */
 642         function getSubjectNsText() {
 643                 global $wgContLang;
 644                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 645         }
 646
 647         /**
 648          * Get the namespace text of the talk page
 649          * @return string
 650          */
 651         function getTalkNsText() {
 652                 global $wgContLang;
 653                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 654         }
 655
 656         /**
 657          * Could this title have a corresponding talk page?
 658          * @return bool
 659          */
 660         function canTalk() {
 661                 return( Namespace::canTalk( $this->mNamespace ) );
 662         }
 663
 664         /**
 665          * Get the interwiki prefix (or null string)
 666          * @return string
 667          * @access public
 668          */
 669         function getInterwiki() { return $this->mInterwiki; }
 670         /**
 671          * Get the Title fragment (i.e. the bit after the #) in text form
 672          * @return string
 673          * @access public
 674          */
 675         function getFragment() { return $this->mFragment; }
 676         /**
 677          * Get the fragment in URL form, including the "#" character if there is one
 678          *
 679          * @return string
 680          * @access public
 681          */
 682         function getFragmentForURL() {
 683                 if ( $this->mFragment == '' ) {
 684                         return '';
 685                 } else {
 686                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 687                 }
 688         }
 689         /**
 690          * Get the default namespace index, for when there is no namespace
 691          * @return int
 692          * @access public
 693          */
 694         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 695
 696         /**
 697          * Get title for search index
 698          * @return string a stripped-down title string ready for the
 699          *      search index
 700          */
 701         function getIndexTitle() {
 702                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 703         }
 704
 705         /**
 706          * Get the prefixed database key form
 707          * @return string the prefixed title, with underscores and
 708          *      any interwiki and namespace prefixes
 709          * @access public
 710          */
 711         function getPrefixedDBkey() {
 712                 $s = $this->prefix( $this->mDbkeyform );
 713                 $s = str_replace( ' ', '_', $s );
 714                 return $s;
 715         }
 716
 717         /**
 718          * Get the prefixed title with spaces.
 719          * This is the form usually used for display
 720          * @return string the prefixed title, with spaces
 721          * @access public
 722          */
 723         function getPrefixedText() {
 724                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 725                         $s = $this->prefix( $this->mTextform );
 726                         $s = str_replace( '_', ' ', $s );
 727                         $this->mPrefixedText = $s;
 728                 }
 729                 return $this->mPrefixedText;
 730         }
 731
 732         /**
 733          * Get the prefixed title with spaces, plus any fragment
 734          * (part beginning with '#')
 735          * @return string the prefixed title, with spaces and
 736          *      the fragment, including '#'
 737          * @access public
 738          */
 739         function getFullText() {
 740                 $text = $this->getPrefixedText();
 741                 if( '' != $this->mFragment ) {
 742                         $text .= '#' . $this->mFragment;
 743                 }
 744                 return $text;
 745         }
 746
 747         /**
 748          * Get the base name, i.e. the leftmost parts before the /
 749          * @return string Base name
 750          */
 751         function getBaseText() {
 752                 global $wgNamespacesWithSubpages;
 753                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 754                         $parts = explode( '/', $this->getText() );
 755                         # Don't discard the real title if there's no subpage involved
 756                         if( count( $parts ) > 1 )
 757                                 unset( $parts[ count( $parts ) - 1 ] );
 758                         return implode( '/', $parts );
 759                 } else {
 760                         return $this->getText();
 761                 }
 762         }
 763
 764         /**
 765          * Get the lowest-level subpage name, i.e. the rightmost part after /
 766          * @return string Subpage name
 767          */
 768         function getSubpageText() {
 769                 global $wgNamespacesWithSubpages;
 770                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 771                         $parts = explode( '/', $this->mTextform );
 772                         return( $parts[ count( $parts ) - 1 ] );
 773                 } else {
 774                         return( $this->mTextform );
 775                 }
 776         }
 777
 778         /**
 779          * Get a URL-encoded form of the subpage text
 780          * @return string URL-encoded subpage name
 781          */
 782         function getSubpageUrlForm() {
 783                 $text = $this->getSubpageText();
 784                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 785                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 786                 return( $text );
 787         }
 788
 789         /**
 790          * Get a URL-encoded title (not an actual URL) including interwiki
 791          * @return string the URL-encoded form
 792          * @access public
 793          */
 794         function getPrefixedURL() {
 795                 $s = $this->prefix( $this->mDbkeyform );
 796                 $s = str_replace( ' ', '_', $s );
 797
 798                 $s = wfUrlencode ( $s ) ;
 799
 800                 # Cleaning up URL to make it look nice -- is this safe?
 801                 $s = str_replace( '%28', '(', $s );
 802                 $s = str_replace( '%29', ')', $s );
 803
 804                 return $s;
 805         }
 806
 807         /**
 808          * Get a real URL referring to this title, with interwiki link and
 809          * fragment
 810          *
 811          * @param string $query an optional query string, not used
 812          *      for interwiki links
 813          * @param string $variant language variant of url (for sr, zh..)
 814          * @return string the URL
 815          * @access public
 816          */
 817         function getFullURL( $query = '', $variant = false ) {
 818                 global $wgContLang, $wgServer, $wgRequest;
 819
 820                 if ( '' == $this->mInterwiki ) {
 821                         $url = $this->getLocalUrl( $query, $variant );
 822
 823                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 824                         // Correct fix would be to move the prepending elsewhere.
 825                         if ($wgRequest->getVal('action') != 'render') {
 826                                 $url = $wgServer . $url;
 827                         }
 828                 } else {
 829                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 830
 831                         $namespace = wfUrlencode( $this->getNsText() );
 832                         if ( '' != $namespace ) {
 833                                 # Can this actually happen? Interwikis shouldn't be parsed.
 834                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 835                                 $namespace .= ':';
 836                         }
 837                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 838                         if( $query != '' ) {
 839                                 if( false === strpos( $url, '?' ) ) {
 840                                         $url .= '?';
 841                                 } else {
 842                                         $url .= '&';
 843                                 }
 844                                 $url .= $query;
 845                         }
 846                 }
 847
 848                 # Finally, add the fragment.
 849                 $url .= $this->getFragmentForURL();
 850
 851                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 852                 return $url;
 853         }
 854
 855         /**
 856          * Get a URL with no fragment or server name.  If this page is generated
 857          * with action=render, $wgServer is prepended.
 858          * @param string $query an optional query string; if not specified,
 859          *      $wgArticlePath will be used.
 860          * @param string $variant language variant of url (for sr, zh..)
 861          * @return string the URL
 862          * @access public
 863          */
 864         function getLocalURL( $query = '', $variant = false ) {
 865                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 866                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 867
 868                 // internal links should point to same variant as current page (only anonymous users)
 869                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 870                         $pref = $wgContLang->getPreferredVariant(false);
 871                         if($pref != $wgContLang->getCode())
 872                                 $variant = $pref;
 873                 }
 874
 875                 if ( $this->isExternal() ) {
 876                         $url = $this->getFullURL();
 877                         if ( $query ) {
 878                                 // This is currently only used for edit section links in the
 879                                 // context of interwiki transclusion. In theory we should
 880                                 // append the query to the end of any existing query string,
 881                                 // but interwiki transclusion is already broken in that case.
 882                                 $url .= "?$query";
 883                         }
 884                 } else {
 885                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 886                         if ( $query == '' ) {
 887                                 if($variant!=false && $wgContLang->hasVariants()){
 888                                         if($wgVariantArticlePath==false)
 889                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 890                                         else
 891                                                 $variantArticlePath = $wgVariantArticlePath;
 892
 893                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 894                                         $url = str_replace( '$1', $dbkey, $url  );
 895
 896                                 }
 897                                 else
 898                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 899                         } else {
 900                                 global $wgActionPaths;
 901                                 $url = false;
 902                                 $matches = array();
 903                                 if( !empty( $wgActionPaths ) &&
 904                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 905                                 {
 906                                         $action = urldecode( $matches[2] );
 907                                         if( isset( $wgActionPaths[$action] ) ) {
 908                                                 $query = $matches[1];
 909                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 910                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 911                                                 if( $query != '' ) $url .= '?' . $query;
 912                                         }
 913                                 }
 914                                 if ( $url === false ) {
 915                                         if ( $query == '-' ) {
 916                                                 $query = '';
 917                                         }
 918                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 919                                 }
 920                         }
 921
 922                         // FIXME: this causes breakage in various places when we
 923                         // actually expected a local URL and end up with dupe prefixes.
 924                         if ($wgRequest->getVal('action') == 'render') {
 925                                 $url = $wgServer . $url;
 926                         }
 927                 }
 928                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 929                 return $url;
 930         }
 931
 932         /**
 933          * Get an HTML-escaped version of the URL form, suitable for
 934          * using in a link, without a server name or fragment
 935          * @param string $query an optional query string
 936          * @return string the URL
 937          * @access public
 938          */
 939         function escapeLocalURL( $query = '' ) {
 940                 return htmlspecialchars( $this->getLocalURL( $query ) );
 941         }
 942
 943         /**
 944          * Get an HTML-escaped version of the URL form, suitable for
 945          * using in a link, including the server name and fragment
 946          *
 947          * @return string the URL
 948          * @param string $query an optional query string
 949          * @access public
 950          */
 951         function escapeFullURL( $query = '' ) {
 952                 return htmlspecialchars( $this->getFullURL( $query ) );
 953         }
 954
 955         /**
 956          * Get the URL form for an internal link.
 957          * - Used in various Squid-related code, in case we have a different
 958          * internal hostname for the server from the exposed one.
 959          *
 960          * @param string $query an optional query string
 961          * @param string $variant language variant of url (for sr, zh..)
 962          * @return string the URL
 963          * @access public
 964          */
 965         function getInternalURL( $query = '', $variant = false ) {
 966                 global $wgInternalServer;
 967                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 968                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 969                 return $url;
 970         }
 971
 972         /**
 973          * Get the edit URL for this Title
 974          * @return string the URL, or a null string if this is an
 975          *      interwiki link
 976          * @access public
 977          */
 978         function getEditURL() {
 979                 if ( '' != $this->mInterwiki ) { return ''; }
 980                 $s = $this->getLocalURL( 'action=edit' );
 981
 982                 return $s;
 983         }
 984
 985         /**
 986          * Get the HTML-escaped displayable text form.
 987          * Used for the title field in <a> tags.
 988          * @return string the text, including any prefixes
 989          * @access public
 990          */
 991         function getEscapedText() {
 992                 return htmlspecialchars( $this->getPrefixedText() );
 993         }
 994
 995         /**
 996          * Is this Title interwiki?
 997          * @return boolean
 998          * @access public
 999          */
1000         function isExternal() { return ( '' != $this->mInterwiki ); }
1001
1002         /**
1003          * Is this page "semi-protected" - the *only* protection is autoconfirm?
1004          *
1005          * @param string Action to check (default: edit)
1006          * @return bool
1007          */
1008         function isSemiProtected( $action = 'edit' ) {
1009                 if( $this->exists() ) {
1010                         $restrictions = $this->getRestrictions( $action );
1011                         if( count( $restrictions ) > 0 ) {
1012                                 foreach( $restrictions as $restriction ) {
1013                                         if( strtolower( $restriction ) != 'autoconfirmed' )
1014                                                 return false;
1015                                 }
1016                         } else {
1017                                 # Not protected
1018                                 return false;
1019                         }
1020                         return true;
1021                 } else {
1022                         # If it doesn't exist, it can't be protected
1023                         return false;
1024                 }
1025         }
1026
1027         /**
1028          * Does the title correspond to a protected article?
1029          * @param string $what the action the page is protected from,
1030          *      by default checks move and edit
1031          * @return boolean
1032          * @access public
1033          */
1034         function isProtected( $action = '' ) {
1035                 global $wgRestrictionLevels;
1036
1037                 if ( NS_SPECIAL == $this->mNamespace ) { return true; }
1038
1039                 if ( $this->isCascadeProtected() ) { return true; }
1040
1041                 if( $action == 'edit' || $action == '' ) {
1042                         $r = $this->getRestrictions( 'edit' );
1043                         foreach( $wgRestrictionLevels as $level ) {
1044                                 if( in_array( $level, $r ) && $level != '' ) {
1045                                         return( true );
1046                                 }
1047                         }
1048                 }
1049
1050                 if( $action == 'move' || $action == '' ) {
1051                         $r = $this->getRestrictions( 'move' );
1052                         foreach( $wgRestrictionLevels as $level ) {
1053                                 if( in_array( $level, $r ) && $level != '' ) {
1054                                         return( true );
1055                                 }
1056                         }
1057                 }
1058
1059                 return false;
1060         }
1061
1062         /**
1063          * Is $wgUser is watching this page?
1064          * @return boolean
1065          * @access public
1066          */
1067         function userIsWatching() {
1068                 global $wgUser;
1069
1070                 if ( is_null( $this->mWatched ) ) {
1071                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1072                                 $this->mWatched = false;
1073                         } else {
1074                                 $this->mWatched = $wgUser->isWatched( $this );
1075                         }
1076                 }
1077                 return $this->mWatched;
1078         }
1079
1080         /**
1081          * Can $wgUser perform $action this page?
1082          * @param string $action action that permission needs to be checked for
1083          * @return boolean
1084          * @private
1085          */
1086         function userCan($action) {
1087                 $fname = 'Title::userCan';
1088                 wfProfileIn( $fname );
1089
1090                 global $wgUser, $wgNamespaceProtection;
1091
1092                 $result = null;
1093                 wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) );
1094                 if ( $result !== null ) {
1095                         wfProfileOut( $fname );
1096                         return $result;
1097                 }
1098
1099                 if( NS_SPECIAL == $this->mNamespace ) {
1100                         wfProfileOut( $fname );
1101                         return false;
1102                 }
1103                 if ( array_key_exists( $this->mNamespace, $wgNamespaceProtection ) ) {
1104                         $nsProt = $wgNamespaceProtection[ $this->mNamespace ];
1105                         if ( !is_array($nsProt) ) $nsProt = array($nsProt);
1106                         foreach( $nsProt as $right ) {
1107                                 if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1108                                         wfProfileOut( $fname );
1109                                         return false;
1110                                 }
1111                         }
1112                 }
1113
1114                 if( $this->mDbkeyform == '_' ) {
1115                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1116                         wfProfileOut( $fname );
1117                         return false;
1118                 }
1119
1120                 # protect css/js subpages of user pages
1121                 # XXX: this might be better using restrictions
1122                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1123                 if( $this->isCssJsSubpage()
1124                         && !$wgUser->isAllowed('editinterface')
1125                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
1126                         wfProfileOut( $fname );
1127                         return false;
1128                 }
1129
1130                 if ( $this->isCascadeProtected() ) {
1131                         # We /could/ use the protection level on the source page, but it's fairly ugly
1132                         #  as we have to establish a precedence hierarchy for pages included by multiple
1133                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1134                         #  as they could remove the protection anyway.
1135                         if ( !$wgUser->isAllowed('protect') ) {
1136                                 wfProfileOut( $fname );
1137                                 return false;
1138                         }
1139                 }
1140
1141                 foreach( $this->getRestrictions($action) as $right ) {
1142                         // Backwards compatibility, rewrite sysop -> protect
1143                         if ( $right == 'sysop' ) {
1144                                 $right = 'protect';
1145                         }
1146                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
1147                                 wfProfileOut( $fname );
1148                                 return false;
1149                         }
1150                 }
1151
1152                 if( $action == 'move' &&
1153                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
1154                         wfProfileOut( $fname );
1155                         return false;
1156                 }
1157
1158                 if( $action == 'create' ) {
1159                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
1160                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
1161                                 wfProfileOut( $fname );
1162                                 return false;
1163                         }
1164                 }
1165
1166                 wfProfileOut( $fname );
1167                 return true;
1168         }
1169
1170         /**
1171          * Can $wgUser edit this page?
1172          * @return boolean
1173          * @access public
1174          */
1175         function userCanEdit() {
1176                 return $this->userCan('edit');
1177         }
1178
1179         /**
1180          * Can $wgUser create this page?
1181          * @return boolean
1182          * @access public
1183          */
1184         function userCanCreate() {
1185                 return $this->userCan('create');
1186         }
1187
1188         /**
1189          * Can $wgUser move this page?
1190          * @return boolean
1191          * @access public
1192          */
1193         function userCanMove() {
1194                 return $this->userCan('move');
1195         }
1196
1197         /**
1198          * Would anybody with sufficient privileges be able to move this page?
1199          * Some pages just aren't movable.
1200          *
1201          * @return boolean
1202          * @access public
1203          */
1204         function isMovable() {
1205                 return Namespace::isMovable( $this->getNamespace() )
1206                         && $this->getInterwiki() == '';
1207         }
1208
1209         /**
1210          * Can $wgUser read this page?
1211          * @return boolean
1212          * @access public
1213          */
1214         function userCanRead() {
1215                 global $wgUser;
1216
1217                 $result = null;
1218                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1219                 if ( $result !== null ) {
1220                         return $result;
1221                 }
1222
1223                 if( $wgUser->isAllowed('read') ) {
1224                         return true;
1225                 } else {
1226                         global $wgWhitelistRead;
1227
1228                         /**
1229                          * Always grant access to the login page.
1230                          * Even anons need to be able to log in.
1231                         */
1232                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1233                                 return true;
1234                         }
1235
1236                         /** some pages are explicitly allowed */
1237                         $name = $this->getPrefixedText();
1238                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1239                                 return true;
1240                         }
1241
1242                         # Compatibility with old settings
1243                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1244                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1245                                         return true;
1246                                 }
1247                         }
1248                 }
1249                 return false;
1250         }
1251
1252         /**
1253          * Is this a talk page of some sort?
1254          * @return bool
1255          * @access public
1256          */
1257         function isTalkPage() {
1258                 return Namespace::isTalk( $this->getNamespace() );
1259         }
1260
1261         /**
1262          * Is this a subpage?
1263          * @return bool
1264          * @access public
1265          */
1266         function isSubpage() {
1267                 global $wgNamespacesWithSubpages;
1268
1269                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1270                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1271                 } else {
1272                         return false;
1273                 }
1274         }
1275
1276         /**
1277          * Is this a .css or .js subpage of a user page?
1278          * @return bool
1279          * @access public
1280          */
1281         function isCssJsSubpage() {
1282                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(css|js)$/", $this->mTextform ) );
1283         }
1284         /**
1285          * Is this a *valid* .css or .js subpage of a user page?
1286          * Check that the corresponding skin exists
1287          */
1288         function isValidCssJsSubpage() {
1289                 if ( $this->isCssJsSubpage() ) {
1290                         $skinNames = Skin::getSkinNames();
1291                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1292                 } else {
1293                         return false;
1294                 }
1295         }
1296         /**
1297          * Trim down a .css or .js subpage title to get the corresponding skin name
1298          */
1299         function getSkinFromCssJsSubpage() {
1300                 $subpage = explode( '/', $this->mTextform );
1301                 $subpage = $subpage[ count( $subpage ) - 1 ];
1302                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1303         }
1304         /**
1305          * Is this a .css subpage of a user page?
1306          * @return bool
1307          * @access public
1308          */
1309         function isCssSubpage() {
1310                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1311         }
1312         /**
1313          * Is this a .js subpage of a user page?
1314          * @return bool
1315          * @access public
1316          */
1317         function isJsSubpage() {
1318                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1319         }
1320         /**
1321          * Protect css/js subpages of user pages: can $wgUser edit
1322          * this page?
1323          *
1324          * @return boolean
1325          * @todo XXX: this might be better using restrictions
1326          * @access public
1327          */
1328         function userCanEditCssJsSubpage() {
1329                 global $wgUser;
1330                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1331         }
1332
1333         /**
1334          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1335          *
1336          * @return bool If the page is subject to cascading restrictions.
1337          * @access public.
1338          */
1339         function isCascadeProtected() {
1340                 return ( $this->getCascadeProtectionSources( false ) );
1341         }
1342
1343         /**
1344          * Cascading protection: Get the source of any cascading restrictions on this page.
1345          *
1346          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1347          * @return mixed 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.
1348          * @access public
1349          */
1350         function getCascadeProtectionSources( $get_pages = true ) {
1351                 global $wgEnableCascadingProtection;
1352                 if (!$wgEnableCascadingProtection)
1353                         return false;
1354
1355                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1356                         return $this->mCascadeSources;
1357                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1358                         return $this->mHasCascadingRestrictions;
1359                 }
1360
1361                 wfProfileIn( __METHOD__ );
1362
1363                 $dbr =& wfGetDb( DB_SLAVE );
1364
1365                 if ( $this->getNamespace() == NS_IMAGE ) {
1366                         $cols = $get_pages ? array('pr_page', 'page_namespace', 'page_title') : array( '1' );
1367                         $tables = array ('imagelinks', 'page_restrictions');
1368                         $where_clauses = array( 'il_to' => $this->getDBkey(), 'il_from=pr_page', 'pr_cascade' => 1 );
1369                 } else {
1370                         $cols = $get_pages ? array( 'pr_page', 'page_namespace', 'page_title' ) : array( '1' );
1371                         $tables = array ('templatelinks', 'page_restrictions');
1372                         $where_clauses = array( 'tl_namespace' => $this->getNamespace(), 'tl_title' => $this->getDBkey(), 'tl_from=pr_page', 'pr_cascade' => 1 );
1373                 }
1374
1375                 if ( $get_pages ) {
1376                         $where_clauses[] = 'page_id=pr_page';
1377                         $tables[] = 'page';
1378                 }
1379
1380                 #!$get_pages or die( var_dump( array( $cols, $tables, $where_clauses ) ) );
1381
1382                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__);
1383
1384                 if ($dbr->numRows($res)) {
1385                         if ($get_pages) {
1386                                 $sources = array ();
1387                                 while ($row = $dbr->fetchObject($res)) {
1388                                         $page_id = $row->pr_page;
1389                                         $page_ns = $row->page_namespace;
1390                                         $page_title = $row->page_title;
1391                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1392                                 }
1393                         } else {
1394                                 $sources = true;
1395                         }
1396                 } else {
1397                         $sources = false;
1398                 }
1399
1400                 wfProfileOut( __METHOD__ );
1401
1402                 if ( $get_pages ) {
1403                         $this->mCascadeSources = $sources;
1404                 } else {
1405                         $this->mHasCascadingRestrictions = $sources;
1406                 }
1407
1408                 return $sources;
1409         }
1410
1411         function areRestrictionsCascading() {
1412                 if (!$this->mRestrictionsLoaded) {
1413                         $this->loadRestrictions();
1414                 }
1415
1416                 return $this->mCascadeRestriction;
1417         }
1418
1419         /**
1420          * Loads a string into mRestrictions array
1421          * @param resource $res restrictions as an SQL result.
1422          * @access public
1423          */
1424         function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1425                 $dbr =& wfGetDb( DB_SLAVE );
1426
1427                 $this->mRestrictions['edit'] = array();
1428                 $this->mRestrictions['move'] = array();
1429
1430                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1431
1432                 if ( $oldFashionedRestrictions == NULL ) {
1433                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1434                 }
1435
1436                 if ($oldFashionedRestrictions != '') {
1437
1438                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1439                                 $temp = explode( '=', trim( $restrict ) );
1440                                 if(count($temp) == 1) {
1441                                         // old old format should be treated as edit/move restriction
1442                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1443                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1444                                 } else {
1445                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1446                                 }
1447                         }
1448
1449                         $this->mOldRestrictions = true;
1450                         $this->mCascadeRestriction = false;
1451
1452                 }
1453
1454                 if ($dbr->numRows( $res) ) {
1455                         # Current system - load second to make them override.
1456                         while ($row = $dbr->fetchObject( $res ) ) {
1457                                 # Cycle through all the restrictions.
1458
1459                                 $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1460
1461                                 $this->mCascadeRestriction |= $row->pr_cascade;
1462                         }
1463                 }
1464
1465                 $this->mRestrictionsLoaded = true;
1466         }
1467
1468         function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1469                 if( !$this->mRestrictionsLoaded ) {
1470                         $dbr =& wfGetDB( DB_SLAVE );
1471
1472                         $res = $dbr->select( 'page_restrictions', '*',
1473                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1474
1475                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1476                 }
1477         }
1478
1479         /**
1480          * Accessor/initialisation for mRestrictions
1481          *
1482          * @access public
1483          * @param string $action action that permission needs to be checked for
1484          * @return array the array of groups allowed to edit this article
1485          */
1486         function getRestrictions( $action ) {
1487                 if( $this->exists() ) {
1488                         if( !$this->mRestrictionsLoaded ) {
1489                                 $this->loadRestrictions();
1490                         }
1491                         return isset( $this->mRestrictions[$action] )
1492                                         ? $this->mRestrictions[$action]
1493                                         : array();
1494                 } else {
1495                         return array();
1496                 }
1497         }
1498
1499         /**
1500          * Is there a version of this page in the deletion archive?
1501          * @return int the number of archived revisions
1502          * @access public
1503          */
1504         function isDeleted() {
1505                 $fname = 'Title::isDeleted';
1506                 if ( $this->getNamespace() < 0 ) {
1507                         $n = 0;
1508                 } else {
1509                         $dbr =& wfGetDB( DB_SLAVE );
1510                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1511                                 'ar_title' => $this->getDBkey() ), $fname );
1512                         if( $this->getNamespace() == NS_IMAGE ) {
1513                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1514                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1515                         }
1516                 }
1517                 return (int)$n;
1518         }
1519
1520         /**
1521          * Get the article ID for this Title from the link cache,
1522          * adding it if necessary
1523          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1524          *      for update
1525          * @return int the ID
1526          */
1527         public function getArticleID( $flags = 0 ) {
1528                 $linkCache =& LinkCache::singleton();
1529                 if ( $flags & GAID_FOR_UPDATE ) {
1530                         $oldUpdate = $linkCache->forUpdate( true );
1531                         $this->mArticleID = $linkCache->addLinkObj( $this );
1532                         $linkCache->forUpdate( $oldUpdate );
1533                 } else {
1534                         if ( -1 == $this->mArticleID ) {
1535                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1536                         }
1537                 }
1538                 return $this->mArticleID;
1539         }
1540
1541         function getLatestRevID() {
1542                 if ($this->mLatestID !== false)
1543                         return $this->mLatestID;
1544
1545                 $db =& wfGetDB(DB_SLAVE);
1546                 return $this->mLatestID = $db->selectField( 'revision',
1547                         "max(rev_id)",
1548                         array('rev_page' => $this->getArticleID()),
1549                         'Title::getLatestRevID' );
1550         }
1551
1552         /**
1553          * This clears some fields in this object, and clears any associated
1554          * keys in the "bad links" section of the link cache.
1555          *
1556          * - This is called from Article::insertNewArticle() to allow
1557          * loading of the new page_id. It's also called from
1558          * Article::doDeleteArticle()
1559          *
1560          * @param int $newid the new Article ID
1561          * @access public
1562          */
1563         function resetArticleID( $newid ) {
1564                 $linkCache =& LinkCache::singleton();
1565                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1566
1567                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1568                 else { $this->mArticleID = $newid; }
1569                 $this->mRestrictionsLoaded = false;
1570                 $this->mRestrictions = array();
1571         }
1572
1573         /**
1574          * Updates page_touched for this page; called from LinksUpdate.php
1575          * @return bool true if the update succeded
1576          * @access public
1577          */
1578         function invalidateCache() {
1579                 global $wgUseFileCache;
1580
1581                 if ( wfReadOnly() ) {
1582                         return;
1583                 }
1584
1585                 $dbw =& wfGetDB( DB_MASTER );
1586                 $success = $dbw->update( 'page',
1587                         array( /* SET */
1588                                 'page_touched' => $dbw->timestamp()
1589                         ), array( /* WHERE */
1590                                 'page_namespace' => $this->getNamespace() ,
1591                                 'page_title' => $this->getDBkey()
1592                         ), 'Title::invalidateCache'
1593                 );
1594
1595                 if ($wgUseFileCache) {
1596                         $cache = new HTMLFileCache($this);
1597                         @unlink($cache->fileCacheName());
1598                 }
1599
1600                 return $success;
1601         }
1602
1603         /**
1604          * Prefix some arbitrary text with the namespace or interwiki prefix
1605          * of this object
1606          *
1607          * @param string $name the text
1608          * @return string the prefixed text
1609          * @private
1610          */
1611         /* private */ function prefix( $name ) {
1612                 $p = '';
1613                 if ( '' != $this->mInterwiki ) {
1614                         $p = $this->mInterwiki . ':';
1615                 }
1616                 if ( 0 != $this->mNamespace ) {
1617                         $p .= $this->getNsText() . ':';
1618                 }
1619                 return $p . $name;
1620         }
1621
1622         /**
1623          * Secure and split - main initialisation function for this object
1624          *
1625          * Assumes that mDbkeyform has been set, and is urldecoded
1626          * and uses underscores, but not otherwise munged.  This function
1627          * removes illegal characters, splits off the interwiki and
1628          * namespace prefixes, sets the other forms, and canonicalizes
1629          * everything.
1630          * @return bool true on success
1631          * @private
1632          */
1633         /* private */ function secureAndSplit() {
1634                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1635
1636                 # Initialisation
1637                 static $rxTc = false;
1638                 if( !$rxTc ) {
1639                         # % is needed as well
1640                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1641                 }
1642
1643                 $this->mInterwiki = $this->mFragment = '';
1644                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1645
1646                 $dbkey = $this->mDbkeyform;
1647
1648                 # Strip Unicode bidi override characters.
1649                 # Sometimes they slip into cut-n-pasted page titles, where the
1650                 # override chars get included in list displays.
1651                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1652                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1653
1654                 # Clean up whitespace
1655                 #
1656                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1657                 $dbkey = trim( $dbkey, '_' );
1658
1659                 if ( '' == $dbkey ) {
1660                         return false;
1661                 }
1662
1663                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1664                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1665                         return false;
1666                 }
1667
1668                 $this->mDbkeyform = $dbkey;
1669
1670                 # Initial colon indicates main namespace rather than specified default
1671                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1672                 if ( ':' == $dbkey{0} ) {
1673                         $this->mNamespace = NS_MAIN;
1674                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1675                 }
1676
1677                 # Namespace or interwiki prefix
1678                 $firstPass = true;
1679                 do {
1680                         $m = array();
1681                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1682                                 $p = $m[1];
1683                                 $lowerNs = $wgContLang->lc( $p );
1684                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1685                                         # Canonical namespace
1686                                         $dbkey = $m[2];
1687                                         $this->mNamespace = $ns;
1688                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1689                                         # Ordinary namespace
1690                                         $dbkey = $m[2];
1691                                         $this->mNamespace = $ns;
1692                                 } elseif( $this->getInterwikiLink( $p ) ) {
1693                                         if( !$firstPass ) {
1694                                                 # Can't make a local interwiki link to an interwiki link.
1695                                                 # That's just crazy!
1696                                                 return false;
1697                                         }
1698
1699                                         # Interwiki link
1700                                         $dbkey = $m[2];
1701                                         $this->mInterwiki = $wgContLang->lc( $p );
1702
1703                                         # Redundant interwiki prefix to the local wiki
1704                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1705                                                 if( $dbkey == '' ) {
1706                                                         # Can't have an empty self-link
1707                                                         return false;
1708                                                 }
1709                                                 $this->mInterwiki = '';
1710                                                 $firstPass = false;
1711                                                 # Do another namespace split...
1712                                                 continue;
1713                                         }
1714
1715                                         # If there's an initial colon after the interwiki, that also
1716                                         # resets the default namespace
1717                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1718                                                 $this->mNamespace = NS_MAIN;
1719                                                 $dbkey = substr( $dbkey, 1 );
1720                                         }
1721                                 }
1722                                 # If there's no recognized interwiki or namespace,
1723                                 # then let the colon expression be part of the title.
1724                         }
1725                         break;
1726                 } while( true );
1727
1728                 # We already know that some pages won't be in the database!
1729                 #
1730                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1731                         $this->mArticleID = 0;
1732                 }
1733                 $fragment = strstr( $dbkey, '#' );
1734                 if ( false !== $fragment ) {
1735                         $this->setFragment( $fragment );
1736                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1737                         # remove whitespace again: prevents "Foo_bar_#"
1738                         # becoming "Foo_bar_"
1739                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1740                 }
1741
1742                 # Reject illegal characters.
1743                 #
1744                 if( preg_match( $rxTc, $dbkey ) ) {
1745                         return false;
1746                 }
1747
1748                 /**
1749                  * Pages with "/./" or "/../" appearing in the URLs will
1750                  * often be unreachable due to the way web browsers deal
1751                  * with 'relative' URLs. Forbid them explicitly.
1752                  */
1753                 if ( strpos( $dbkey, '.' ) !== false &&
1754                      ( $dbkey === '.' || $dbkey === '..' ||
1755                        strpos( $dbkey, './' ) === 0  ||
1756                        strpos( $dbkey, '../' ) === 0 ||
1757                        strpos( $dbkey, '/./' ) !== false ||
1758                        strpos( $dbkey, '/../' ) !== false ) )
1759                 {
1760                         return false;
1761                 }
1762
1763                 /**
1764                  * Limit the size of titles to 255 bytes.
1765                  * This is typically the size of the underlying database field.
1766                  * We make an exception for special pages, which don't need to be stored
1767                  * in the database, and may edge over 255 bytes due to subpage syntax
1768                  * for long titles, e.g. [[Special:Block/Long name]]
1769                  */
1770                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1771                   strlen( $dbkey ) > 512 )
1772                 {
1773                         return false;
1774                 }
1775
1776                 /**
1777                  * Normally, all wiki links are forced to have
1778                  * an initial capital letter so [[foo]] and [[Foo]]
1779                  * point to the same place.
1780                  *
1781                  * Don't force it for interwikis, since the other
1782                  * site might be case-sensitive.
1783                  */
1784                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1785                         $dbkey = $wgContLang->ucfirst( $dbkey );
1786                 }
1787
1788                 /**
1789                  * Can't make a link to a namespace alone...
1790                  * "empty" local links can only be self-links
1791                  * with a fragment identifier.
1792                  */
1793                 if( $dbkey == '' &&
1794                         $this->mInterwiki == '' &&
1795                         $this->mNamespace != NS_MAIN ) {
1796                         return false;
1797                 }
1798
1799                 // Any remaining initial :s are illegal.
1800                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1801                         return false;
1802                 }
1803
1804                 # Fill fields
1805                 $this->mDbkeyform = $dbkey;
1806                 $this->mUrlform = wfUrlencode( $dbkey );
1807
1808                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1809
1810                 return true;
1811         }
1812
1813         /**
1814          * Set the fragment for this title
1815          * This is kind of bad, since except for this rarely-used function, Title objects
1816          * are immutable. The reason this is here is because it's better than setting the
1817          * members directly, which is what Linker::formatComment was doing previously.
1818          *
1819          * @param string $fragment text
1820          * @access kind of public
1821          */
1822         function setFragment( $fragment ) {
1823                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1824         }
1825
1826         /**
1827          * Get a Title object associated with the talk page of this article
1828          * @return Title the object for the talk page
1829          * @access public
1830          */
1831         function getTalkPage() {
1832                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1833         }
1834
1835         /**
1836          * Get a title object associated with the subject page of this
1837          * talk page
1838          *
1839          * @return Title the object for the subject page
1840          * @access public
1841          */
1842         function getSubjectPage() {
1843                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1844         }
1845
1846         /**
1847          * Get an array of Title objects linking to this Title
1848          * Also stores the IDs in the link cache.
1849          *
1850          * WARNING: do not use this function on arbitrary user-supplied titles!
1851          * On heavily-used templates it will max out the memory.
1852          *
1853          * @param string $options may be FOR UPDATE
1854          * @return array the Title objects linking here
1855          * @access public
1856          */
1857         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1858                 $linkCache =& LinkCache::singleton();
1859
1860                 if ( $options ) {
1861                         $db =& wfGetDB( DB_MASTER );
1862                 } else {
1863                         $db =& wfGetDB( DB_SLAVE );
1864                 }
1865
1866                 $res = $db->select( array( 'page', $table ),
1867                         array( 'page_namespace', 'page_title', 'page_id' ),
1868                         array(
1869                                 "{$prefix}_from=page_id",
1870                                 "{$prefix}_namespace" => $this->getNamespace(),
1871                                 "{$prefix}_title"     => $this->getDbKey() ),
1872                         'Title::getLinksTo',
1873                         $options );
1874
1875                 $retVal = array();
1876                 if ( $db->numRows( $res ) ) {
1877                         while ( $row = $db->fetchObject( $res ) ) {
1878                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1879                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1880                                         $retVal[] = $titleObj;
1881                                 }
1882                         }
1883                 }
1884                 $db->freeResult( $res );
1885                 return $retVal;
1886         }
1887
1888         /**
1889          * Get an array of Title objects using this Title as a template
1890          * Also stores the IDs in the link cache.
1891          *
1892          * WARNING: do not use this function on arbitrary user-supplied titles!
1893          * On heavily-used templates it will max out the memory.
1894          *
1895          * @param string $options may be FOR UPDATE
1896          * @return array the Title objects linking here
1897          * @access public
1898          */
1899         function getTemplateLinksTo( $options = '' ) {
1900                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1901         }
1902
1903         /**
1904          * Get an array of Title objects referring to non-existent articles linked from this page
1905          *
1906          * @param string $options may be FOR UPDATE
1907          * @return array the Title objects
1908          * @access public
1909          */
1910         function getBrokenLinksFrom( $options = '' ) {
1911                 if ( $options ) {
1912                         $db =& wfGetDB( DB_MASTER );
1913                 } else {
1914                         $db =& wfGetDB( DB_SLAVE );
1915                 }
1916
1917                 $res = $db->safeQuery(
1918                           "SELECT pl_namespace, pl_title
1919                              FROM !
1920                         LEFT JOIN !
1921                                ON pl_namespace=page_namespace
1922                               AND pl_title=page_title
1923                             WHERE pl_from=?
1924                               AND page_namespace IS NULL
1925                                   !",
1926                         $db->tableName( 'pagelinks' ),
1927                         $db->tableName( 'page' ),
1928                         $this->getArticleId(),
1929                         $options );
1930
1931                 $retVal = array();
1932                 if ( $db->numRows( $res ) ) {
1933                         while ( $row = $db->fetchObject( $res ) ) {
1934                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1935                         }
1936                 }
1937                 $db->freeResult( $res );
1938                 return $retVal;
1939         }
1940
1941
1942         /**
1943          * Get a list of URLs to purge from the Squid cache when this
1944          * page changes
1945          *
1946          * @return array the URLs
1947          * @access public
1948          */
1949         function getSquidURLs() {
1950                 global $wgContLang;
1951
1952                 $urls = array(
1953                         $this->getInternalURL(),
1954                         $this->getInternalURL( 'action=history' )
1955                 );
1956
1957                 // purge variant urls as well
1958                 if($wgContLang->hasVariants()){
1959                         $variants = $wgContLang->getVariants();
1960                         foreach($variants as $vCode){
1961                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
1962                                 $urls[] = $this->getInternalURL('',$vCode);
1963                         }
1964                 }
1965
1966                 return $urls;
1967         }
1968
1969         function purgeSquid() {
1970                 global $wgUseSquid;
1971                 if ( $wgUseSquid ) {
1972                         $urls = $this->getSquidURLs();
1973                         $u = new SquidUpdate( $urls );
1974                         $u->doUpdate();
1975                 }
1976         }
1977
1978         /**
1979          * Move this page without authentication
1980          * @param Title &$nt the new page Title
1981          * @access public
1982          */
1983         function moveNoAuth( &$nt ) {
1984                 return $this->moveTo( $nt, false );
1985         }
1986
1987         /**
1988          * Check whether a given move operation would be valid.
1989          * Returns true if ok, or a message key string for an error message
1990          * if invalid. (Scarrrrry ugly interface this.)
1991          * @param Title &$nt the new title
1992          * @param bool $auth indicates whether $wgUser's permissions
1993          *      should be checked
1994          * @return mixed true on success, message name on failure
1995          * @access public
1996          */
1997         function isValidMoveOperation( &$nt, $auth = true ) {
1998                 if( !$this or !$nt ) {
1999                         return 'badtitletext';
2000                 }
2001                 if( $this->equals( $nt ) ) {
2002                         return 'selfmove';
2003                 }
2004                 if( !$this->isMovable() || !$nt->isMovable() ) {
2005                         return 'immobile_namespace';
2006                 }
2007
2008                 $oldid = $this->getArticleID();
2009                 $newid = $nt->getArticleID();
2010
2011                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2012                         return 'articleexists';
2013                 }
2014                 if ( ( '' == $this->getDBkey() ) ||
2015                          ( !$oldid ) ||
2016                      ( '' == $nt->getDBkey() ) ) {
2017                         return 'badarticleerror';
2018                 }
2019
2020                 if ( $auth && (
2021                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
2022                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
2023                         return 'protectedpage';
2024                 }
2025
2026                 # The move is allowed only if (1) the target doesn't exist, or
2027                 # (2) the target is a redirect to the source, and has no history
2028                 # (so we can undo bad moves right after they're done).
2029
2030                 if ( 0 != $newid ) { # Target exists; check for validity
2031                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2032                                 return 'articleexists';
2033                         }
2034                 }
2035                 return true;
2036         }
2037
2038         /**
2039          * Move a title to a new location
2040          * @param Title &$nt the new title
2041          * @param bool $auth indicates whether $wgUser's permissions
2042          *      should be checked
2043          * @return mixed true on success, message name on failure
2044          * @access public
2045          */
2046         function moveTo( &$nt, $auth = true, $reason = '' ) {
2047                 $err = $this->isValidMoveOperation( $nt, $auth );
2048                 if( is_string( $err ) ) {
2049                         return $err;
2050                 }
2051
2052                 $pageid = $this->getArticleID();
2053                 if( $nt->exists() ) {
2054                         $this->moveOverExistingRedirect( $nt, $reason );
2055                         $pageCountChange = 0;
2056                 } else { # Target didn't exist, do normal move.
2057                         $this->moveToNewTitle( $nt, $reason );
2058                         $pageCountChange = 1;
2059                 }
2060                 $redirid = $this->getArticleID();
2061
2062                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2063                 $dbw =& wfGetDB( DB_MASTER );
2064                 $categorylinks = $dbw->tableName( 'categorylinks' );
2065                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2066                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2067                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2068                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2069
2070                 # Update watchlists
2071
2072                 $oldnamespace = $this->getNamespace() & ~1;
2073                 $newnamespace = $nt->getNamespace() & ~1;
2074                 $oldtitle = $this->getDBkey();
2075                 $newtitle = $nt->getDBkey();
2076
2077                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2078                         WatchedItem::duplicateEntries( $this, $nt );
2079                 }
2080
2081                 # Update search engine
2082                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2083                 $u->doUpdate();
2084                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2085                 $u->doUpdate();
2086
2087                 # Update site_stats
2088                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2089                         # No longer a content page
2090                         # Not viewed, edited, removing
2091                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2092                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2093                         # Now a content page
2094                         # Not viewed, edited, adding
2095                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2096                 } elseif( $pageCountChange ) {
2097                         # Redirect added
2098                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2099                 } else {
2100                         # Nothing special
2101                         $u = false;
2102                 }
2103                 if( $u )
2104                         $u->doUpdate();
2105
2106                 global $wgUser;
2107                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2108                 return true;
2109         }
2110
2111         /**
2112          * Move page to a title which is at present a redirect to the
2113          * source page
2114          *
2115          * @param Title &$nt the page to move to, which should currently
2116          *      be a redirect
2117          * @private
2118          */
2119         function moveOverExistingRedirect( &$nt, $reason = '' ) {
2120                 global $wgUseSquid;
2121                 $fname = 'Title::moveOverExistingRedirect';
2122                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2123
2124                 if ( $reason ) {
2125                         $comment .= ": $reason";
2126                 }
2127
2128                 $now = wfTimestampNow();
2129                 $newid = $nt->getArticleID();
2130                 $oldid = $this->getArticleID();
2131                 $dbw =& wfGetDB( DB_MASTER );
2132                 $linkCache =& LinkCache::singleton();
2133
2134                 # Delete the old redirect. We don't save it to history since
2135                 # by definition if we've got here it's rather uninteresting.
2136                 # We have to remove it so that the next step doesn't trigger
2137                 # a conflict on the unique namespace+title index...
2138                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2139
2140                 # Save a null revision in the page's history notifying of the move
2141                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2142                 $nullRevId = $nullRevision->insertOn( $dbw );
2143
2144                 # Change the name of the target page:
2145                 $dbw->update( 'page',
2146                         /* SET */ array(
2147                                 'page_touched'   => $dbw->timestamp($now),
2148                                 'page_namespace' => $nt->getNamespace(),
2149                                 'page_title'     => $nt->getDBkey(),
2150                                 'page_latest'    => $nullRevId,
2151                         ),
2152                         /* WHERE */ array( 'page_id' => $oldid ),
2153                         $fname
2154                 );
2155                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2156
2157                 # Recreate the redirect, this time in the other direction.
2158                 $mwRedir = MagicWord::get( 'redirect' );
2159                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2160                 $redirectArticle = new Article( $this );
2161                 $newid = $redirectArticle->insertOn( $dbw );
2162                 $redirectRevision = new Revision( array(
2163                         'page'    => $newid,
2164                         'comment' => $comment,
2165                         'text'    => $redirectText ) );
2166                 $redirectRevision->insertOn( $dbw );
2167                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2168                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2169
2170                 # Log the move
2171                 $log = new LogPage( 'move' );
2172                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2173
2174                 # Now, we record the link from the redirect to the new title.
2175                 # It should have no other outgoing links...
2176                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2177                 $dbw->insert( 'pagelinks',
2178                         array(
2179                                 'pl_from'      => $newid,
2180                                 'pl_namespace' => $nt->getNamespace(),
2181                                 'pl_title'     => $nt->getDbKey() ),
2182                         $fname );
2183
2184                 # Purge squid
2185                 if ( $wgUseSquid ) {
2186                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2187                         $u = new SquidUpdate( $urls );
2188                         $u->doUpdate();
2189                 }
2190         }
2191
2192         /**
2193          * Move page to non-existing title.
2194          * @param Title &$nt the new Title
2195          * @private
2196          */
2197         function moveToNewTitle( &$nt, $reason = '' ) {
2198                 global $wgUseSquid;
2199                 $fname = 'MovePageForm::moveToNewTitle';
2200                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2201                 if ( $reason ) {
2202                         $comment .= ": $reason";
2203                 }
2204
2205                 $newid = $nt->getArticleID();
2206                 $oldid = $this->getArticleID();
2207                 $dbw =& wfGetDB( DB_MASTER );
2208                 $now = $dbw->timestamp();
2209                 $linkCache =& LinkCache::singleton();
2210
2211                 # Save a null revision in the page's history notifying of the move
2212                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2213                 $nullRevId = $nullRevision->insertOn( $dbw );
2214
2215                 # Rename cur entry
2216                 $dbw->update( 'page',
2217                         /* SET */ array(
2218                                 'page_touched'   => $now,
2219                                 'page_namespace' => $nt->getNamespace(),
2220                                 'page_title'     => $nt->getDBkey(),
2221                                 'page_latest'    => $nullRevId,
2222                         ),
2223                         /* WHERE */ array( 'page_id' => $oldid ),
2224                         $fname
2225                 );
2226
2227                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2228
2229                 # Insert redirect
2230                 $mwRedir = MagicWord::get( 'redirect' );
2231                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2232                 $redirectArticle = new Article( $this );
2233                 $newid = $redirectArticle->insertOn( $dbw );
2234                 $redirectRevision = new Revision( array(
2235                         'page'    => $newid,
2236                         'comment' => $comment,
2237                         'text'    => $redirectText ) );
2238                 $redirectRevision->insertOn( $dbw );
2239                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2240                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2241
2242                 # Log the move
2243                 $log = new LogPage( 'move' );
2244                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2245
2246                 # Purge caches as per article creation
2247                 Article::onArticleCreate( $nt );
2248
2249                 # Record the just-created redirect's linking to the page
2250                 $dbw->insert( 'pagelinks',
2251                         array(
2252                                 'pl_from'      => $newid,
2253                                 'pl_namespace' => $nt->getNamespace(),
2254                                 'pl_title'     => $nt->getDBkey() ),
2255                         $fname );
2256
2257                 # Purge old title from squid
2258                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2259                 $this->purgeSquid();
2260         }
2261
2262         /**
2263          * Checks if $this can be moved to a given Title
2264          * - Selects for update, so don't call it unless you mean business
2265          *
2266          * @param Title &$nt the new title to check
2267          * @access public
2268          */
2269         function isValidMoveTarget( $nt ) {
2270
2271                 $fname = 'Title::isValidMoveTarget';
2272                 $dbw =& wfGetDB( DB_MASTER );
2273
2274                 # Is it a redirect?
2275                 $id  = $nt->getArticleID();
2276                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2277                         array( 'page_is_redirect','old_text','old_flags' ),
2278                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2279                         $fname, 'FOR UPDATE' );
2280
2281                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2282                         # Not a redirect
2283                         wfDebug( __METHOD__ . ": not a redirect\n" );
2284                         return false;
2285                 }
2286                 $text = Revision::getRevisionText( $obj );
2287
2288                 # Does the redirect point to the source?
2289                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2290                 $m = array();
2291                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2292                         $redirTitle = Title::newFromText( $m[1] );
2293                         if( !is_object( $redirTitle ) ||
2294                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2295                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2296                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2297                                 return false;
2298                         }
2299                 } else {
2300                         # Fail safe
2301                         wfDebug( __METHOD__ . ": failsafe\n" );
2302                         return false;
2303                 }
2304
2305                 # Does the article have a history?
2306                 $row = $dbw->selectRow( array( 'page', 'revision'),
2307                         array( 'rev_id' ),
2308                         array( 'page_namespace' => $nt->getNamespace(),
2309                                 'page_title' => $nt->getDBkey(),
2310                                 'page_id=rev_page AND page_latest != rev_id'
2311                         ), $fname, 'FOR UPDATE'
2312                 );
2313
2314                 # Return true if there was no history
2315                 return $row === false;
2316         }
2317
2318         /**
2319          * Create a redirect; fails if the title already exists; does
2320          * not notify RC
2321          *
2322          * @param Title $dest the destination of the redirect
2323          * @param string $comment the comment string describing the move
2324          * @return bool true on success
2325          * @access public
2326          */
2327         function createRedirect( $dest, $comment ) {
2328                 if ( $this->getArticleID() ) {
2329                         return false;
2330                 }
2331
2332                 $fname = 'Title::createRedirect';
2333                 $dbw =& wfGetDB( DB_MASTER );
2334
2335                 $article = new Article( $this );
2336                 $newid = $article->insertOn( $dbw );
2337                 $revision = new Revision( array(
2338                         'page'      => $newid,
2339                         'comment'   => $comment,
2340                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
2341                         ) );
2342                 $revision->insertOn( $dbw );
2343                 $article->updateRevisionOn( $dbw, $revision, 0 );
2344
2345                 # Link table
2346                 $dbw->insert( 'pagelinks',
2347                         array(
2348                                 'pl_from'      => $newid,
2349                                 'pl_namespace' => $dest->getNamespace(),
2350                                 'pl_title'     => $dest->getDbKey()
2351                         ), $fname
2352                 );
2353
2354                 Article::onArticleCreate( $this );
2355                 return true;
2356         }
2357
2358         /**
2359          * Get categories to which this Title belongs and return an array of
2360          * categories' names.
2361          *
2362          * @return array an array of parents in the form:
2363          *      $parent => $currentarticle
2364          * @access public
2365          */
2366         function getParentCategories() {
2367                 global $wgContLang;
2368
2369                 $titlekey = $this->getArticleId();
2370                 $dbr =& wfGetDB( DB_SLAVE );
2371                 $categorylinks = $dbr->tableName( 'categorylinks' );
2372
2373                 # NEW SQL
2374                 $sql = "SELECT * FROM $categorylinks"
2375                      ." WHERE cl_from='$titlekey'"
2376                          ." AND cl_from <> '0'"
2377                          ." ORDER BY cl_sortkey";
2378
2379                 $res = $dbr->query ( $sql ) ;
2380
2381                 if($dbr->numRows($res) > 0) {
2382                         while ( $x = $dbr->fetchObject ( $res ) )
2383                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2384                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2385                         $dbr->freeResult ( $res ) ;
2386                 } else {
2387                         $data = '';
2388                 }
2389                 return $data;
2390         }
2391
2392         /**
2393          * Get a tree of parent categories
2394          * @param array $children an array with the children in the keys, to check for circular refs
2395          * @return array
2396          * @access public
2397          */
2398         function getParentCategoryTree( $children = array() ) {
2399                 $parents = $this->getParentCategories();
2400
2401                 if($parents != '') {
2402                         foreach($parents as $parent => $current) {
2403                                 if ( array_key_exists( $parent, $children ) ) {
2404                                         # Circular reference
2405                                         $stack[$parent] = array();
2406                                 } else {
2407                                         $nt = Title::newFromText($parent);
2408                                         if ( $nt ) {
2409                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2410                                         }
2411                                 }
2412                         }
2413                         return $stack;
2414                 } else {
2415                         return array();
2416                 }
2417         }
2418
2419
2420         /**
2421          * Get an associative array for selecting this title from
2422          * the "page" table
2423          *
2424          * @return array
2425          * @access public
2426          */
2427         function pageCond() {
2428                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2429         }
2430
2431         /**
2432          * Get the revision ID of the previous revision
2433          *
2434          * @param integer $revision  Revision ID. Get the revision that was before this one.
2435          * @return integer $oldrevision|false
2436          */
2437         function getPreviousRevisionID( $revision ) {
2438                 $dbr =& wfGetDB( DB_SLAVE );
2439                 return $dbr->selectField( 'revision', 'rev_id',
2440                         'rev_page=' . intval( $this->getArticleId() ) .
2441                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2442         }
2443
2444         /**
2445          * Get the revision ID of the next revision
2446          *
2447          * @param integer $revision  Revision ID. Get the revision that was after this one.
2448          * @return integer $oldrevision|false
2449          */
2450         function getNextRevisionID( $revision ) {
2451                 $dbr =& wfGetDB( DB_SLAVE );
2452                 return $dbr->selectField( 'revision', 'rev_id',
2453                         'rev_page=' . intval( $this->getArticleId() ) .
2454                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2455         }
2456
2457         /**
2458          * Get the number of revisions between the given revision IDs.
2459          *
2460          * @param integer $old  Revision ID.
2461          * @param integer $new  Revision ID.
2462          * @return integer  Number of revisions between these IDs.
2463          */
2464         function countRevisionsBetween( $old, $new ) {
2465                 $dbr =& wfGetDB( DB_SLAVE );
2466                 return $dbr->selectField( 'revision', 'count(*)',
2467                         'rev_page = ' . intval( $this->getArticleId() ) .
2468                         ' AND rev_id > ' . intval( $old ) .
2469                         ' AND rev_id < ' . intval( $new ) );
2470         }
2471
2472         /**
2473          * Compare with another title.
2474          *
2475          * @param Title $title
2476          * @return bool
2477          */
2478         function equals( $title ) {
2479                 // Note: === is necessary for proper matching of number-like titles.
2480                 return $this->getInterwiki() === $title->getInterwiki()
2481                         && $this->getNamespace() == $title->getNamespace()
2482                         && $this->getDbkey() === $title->getDbkey();
2483         }
2484
2485         /**
2486          * Check if page exists
2487          * @return bool
2488          */
2489         function exists() {
2490                 return $this->getArticleId() != 0;
2491         }
2492
2493         /**
2494          * Should a link should be displayed as a known link, just based on its title?
2495          *
2496          * Currently, a self-link with a fragment and special pages are in
2497          * this category. Special pages never exist in the database.
2498          */
2499         function isAlwaysKnown() {
2500                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2501                   || NS_SPECIAL == $this->mNamespace;
2502         }
2503
2504         /**
2505          * Update page_touched timestamps and send squid purge messages for
2506          * pages linking to this title. May be sent to the job queue depending
2507          * on the number of links. Typically called on create and delete.
2508          */
2509         function touchLinks() {
2510                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2511                 $u->doUpdate();
2512
2513                 if ( $this->getNamespace() == NS_CATEGORY ) {
2514                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2515                         $u->doUpdate();
2516                 }
2517         }
2518
2519         /**
2520          * Get the last touched timestamp
2521          */
2522         function getTouched() {
2523                 $dbr =& wfGetDB( DB_SLAVE );
2524                 $touched = $dbr->selectField( 'page', 'page_touched',
2525                         array(
2526                                 'page_namespace' => $this->getNamespace(),
2527                                 'page_title' => $this->getDBkey()
2528                         ), __METHOD__
2529                 );
2530                 return $touched;
2531         }
2532
2533         /**
2534          * Get a cached value from a global cache that is invalidated when this page changes
2535          * @param string $key the key
2536          * @param callback $callback A callback function which generates the value on cache miss
2537          *
2538          * @deprecated use DependencyWrapper
2539          */
2540         function getRelatedCache( $memc, $key, $expiry, $callback, $params = array() ) {
2541                 return DependencyWrapper::getValueFromCache( $memc, $key, $expiry, $callback,
2542                         $params, new TitleDependency( $this ) );
2543         }
2544
2545         function trackbackURL() {
2546                 global $wgTitle, $wgScriptPath, $wgServer;
2547
2548                 return "$wgServer$wgScriptPath/trackback.php?article="
2549                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2550         }
2551
2552         function trackbackRDF() {
2553                 $url = htmlspecialchars($this->getFullURL());
2554                 $title = htmlspecialchars($this->getText());
2555                 $tburl = $this->trackbackURL();
2556
2557                 return "
2558 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2559          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2560          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2561 <rdf:Description
2562    rdf:about=\"$url\"
2563    dc:identifier=\"$url\"
2564    dc:title=\"$title\"
2565    trackback:ping=\"$tburl\" />
2566 </rdf:RDF>";
2567         }
2568
2569         /**
2570          * Generate strings used for xml 'id' names in monobook tabs
2571          * @return string
2572          */
2573         function getNamespaceKey() {
2574                 global $wgContLang;
2575                 switch ($this->getNamespace()) {
2576                         case NS_MAIN:
2577                         case NS_TALK:
2578                                 return 'nstab-main';
2579                         case NS_USER:
2580                         case NS_USER_TALK:
2581                                 return 'nstab-user';
2582                         case NS_MEDIA:
2583                                 return 'nstab-media';
2584                         case NS_SPECIAL:
2585                                 return 'nstab-special';
2586                         case NS_PROJECT:
2587                         case NS_PROJECT_TALK:
2588                                 return 'nstab-project';
2589                         case NS_IMAGE:
2590                         case NS_IMAGE_TALK:
2591                                 return 'nstab-image';
2592                         case NS_MEDIAWIKI:
2593                         case NS_MEDIAWIKI_TALK:
2594                                 return 'nstab-mediawiki';
2595                         case NS_TEMPLATE:
2596                         case NS_TEMPLATE_TALK:
2597                                 return 'nstab-template';
2598                         case NS_HELP:
2599                         case NS_HELP_TALK:
2600                                 return 'nstab-help';
2601                         case NS_CATEGORY:
2602                         case NS_CATEGORY_TALK:
2603                                 return 'nstab-category';
2604                         default:
2605                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2606                 }
2607         }
2608
2609         /**
2610          * Returns true if this title resolves to the named special page
2611          * @param string $name The special page name
2612          * @access public
2613          */
2614         function isSpecial( $name ) {
2615                 if ( $this->getNamespace() == NS_SPECIAL ) {
2616                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2617                         if ( $name == $thisName ) {
2618                                 return true;
2619                         }
2620                 }
2621                 return false;
2622         }
2623
2624         /**
2625          * If the Title refers to a special page alias which is not the local default,
2626          * returns a new Title which points to the local default. Otherwise, returns $this.
2627          */
2628         function fixSpecialName() {
2629                 if ( $this->getNamespace() == NS_SPECIAL ) {
2630                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2631                         if ( $canonicalName ) {
2632                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2633                                 if ( $localName != $this->mDbkeyform ) {
2634                                         return Title::makeTitle( NS_SPECIAL, $localName );
2635                                 }
2636                         }
2637                 }
2638                 return $this;
2639         }
2640
2641         /**
2642          * Is this Title in a namespace which contains content?
2643          * In other words, is this a content page, for the purposes of calculating
2644          * statistics, etc?
2645          *
2646          * @return bool
2647          */
2648         public function isContentPage() {
2649                 return Namespace::isContent( $this->getNamespace() );
2650         }
2651
2652 }
2653
2654 ?>