includes/Title.php

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