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