includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 if ( !class_exists( 'UtfNormal' ) ) {
   9         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  10 }
  11
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 # Constants for pr_cascade bitfield
  22 define( 'CASCADE', 1 );
  23
  24 /**
  25  * Title class
  26  * - Represents a title, which may contain an interwiki designation or namespace
  27  * - Can fetch various kinds of data from the database, albeit inefficiently.
  28  *
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43         /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;                 # Text form (spaces not underscores) of the main part
  48         var $mUrlform;                  # URL-encoded form of the main part
  49         var $mDbkeyform;                # Main part with underscores
  50         var $mUserCaseDBKey;        # DB key with the initial letter in the case specified by the user
  51         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki;                # Interwiki prefix (or null string)
  53         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  54         var $mArticleID;                # Article ID, fetched from the link cache on demand
  55         var $mLatestID;                 # ID of most recent revision
  56         var $mRestrictions;             # Array of groups allowed to edit this article
  57         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  58         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  59         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  60         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  61         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  62         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  63         var $mDefaultNamespace;         # Namespace index when there is no namespace
  64                                         # Zero except in {{transclusion}} tags
  65         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  66         /**#@-*/
  67
  68
  69         /**
  70          * Constructor
  71          * @private
  72          */
  73         /* private */ function __construct() {
  74                 $this->mInterwiki = $this->mUrlform =
  75                 $this->mTextform = $this->mDbkeyform = '';
  76                 $this->mArticleID = -1;
  77                 $this->mNamespace = NS_MAIN;
  78                 $this->mRestrictionsLoaded = false;
  79                 $this->mRestrictions = array();
  80                 # Dont change the following, NS_MAIN is hardcoded in several place
  81                 # See bug #696
  82                 $this->mDefaultNamespace = NS_MAIN;
  83                 $this->mWatched = NULL;
  84                 $this->mLatestID = false;
  85                 $this->mOldRestrictions = false;
  86         }
  87
  88         /**
  89          * Create a new Title from a prefixed DB key
  90          * @param string $key The database key, which has underscores
  91          *      instead of spaces, possibly including namespace and
  92          *      interwiki prefixes
  93          * @return Title the new object, or NULL on an error
  94          */
  95         public static function newFromDBkey( $key ) {
  96                 $t = new Title();
  97                 $t->mDbkeyform = $key;
  98                 if( $t->secureAndSplit() )
  99                         return $t;
 100                 else
 101                         return NULL;
 102         }
 103
 104         /**
 105          * Create a new Title from text, such as what one would
 106          * find in a link. Decodes any HTML entities in the text.
 107          *
 108          * @param string $text the link text; spaces, prefixes,
 109          *      and an initial ':' indicating the main namespace
 110          *      are accepted
 111          * @param int $defaultNamespace the namespace to use if
 112          *      none is specified by a prefix
 113          * @return Title the new object, or NULL on an error
 114          */
 115         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 116                 if( is_object( $text ) ) {
 117                         throw new MWException( 'Title::newFromText given an object' );
 118                 }
 119
 120                 /**
 121                  * Wiki pages often contain multiple links to the same page.
 122                  * Title normalization and parsing can become expensive on
 123                  * pages with many links, so we can save a little time by
 124                  * caching them.
 125                  *
 126                  * In theory these are value objects and won't get changed...
 127                  */
 128                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 129                         return Title::$titleCache[$text];
 130                 }
 131
 132                 /**
 133                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 134                  */
 135                 $filteredText = Sanitizer::decodeCharReferences( $text );
 136
 137                 $t = new Title();
 138                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 139                 $t->mDefaultNamespace = $defaultNamespace;
 140
 141                 static $cachedcount = 0 ;
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         Title::$titleCache = array();
 147                                         $cachedcount=0;
 148                                 }
 149                                 $cachedcount++;
 150                                 Title::$titleCache[$text] =& $t;
 151                         }
 152                         return $t;
 153                 } else {
 154                         $ret = NULL;
 155                         return $ret;
 156                 }
 157         }
 158
 159         /**
 160          * Create a new Title from URL-encoded text. Ensures that
 161          * the given title's length does not exceed the maximum.
 162          * @param string $url the title, as might be taken from a URL
 163          * @return Title the new object, or NULL on an error
 164          */
 165         public static function newFromURL( $url ) {
 166                 global $wgLegalTitleChars;
 167                 $t = new Title();
 168
 169                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 170                 # but some URLs used it as a space replacement and they still come
 171                 # from some external search tools.
 172                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 173                         $url = str_replace( '+', ' ', $url );
 174                 }
 175
 176                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 177                 if( $t->secureAndSplit() ) {
 178                         return $t;
 179                 } else {
 180                         return NULL;
 181                 }
 182         }
 183
 184         /**
 185          * Create a new Title from an article ID
 186          *
 187          * @todo This is inefficiently implemented, the page row is requested
 188          *       but not used for anything else
 189          *
 190          * @param int $id the page_id corresponding to the Title to create
 191          * @return Title the new object, or NULL on an error
 192          */
 193         public static function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr = wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          */
 209         public static function newFromIDs( $ids ) {
 210                 if ( !count( $ids ) ) {
 211                         return array();
 212                 }
 213                 $dbr = wfGetDB( DB_SLAVE );
 214                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 215                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 216
 217                 $titles = array();
 218                 while ( $row = $dbr->fetchObject( $res ) ) {
 219                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 220                 }
 221                 return $titles;
 222         }
 223
 224         /**
 225          * Create a new Title from a namespace index and a DB key.
 226          * It's assumed that $ns and $title are *valid*, for instance when
 227          * they came directly from the database or a special page name.
 228          * For convenience, spaces are converted to underscores so that
 229          * eg user_text fields can be used directly.
 230          *
 231          * @param int $ns the namespace of the article
 232          * @param string $title the unprefixed database key form
 233          * @return Title the new object
 234          */
 235         public static function &makeTitle( $ns, $title ) {
 236                 $t = new Title();
 237                 $t->mInterwiki = '';
 238                 $t->mFragment = '';
 239                 $t->mNamespace = $ns = intval( $ns );
 240                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 241                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 242                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 243                 $t->mTextform = str_replace( '_', ' ', $title );
 244                 return $t;
 245         }
 246
 247         /**
 248          * Create a new Title from a namespace index and a DB key.
 249          * The parameters will be checked for validity, which is a bit slower
 250          * than makeTitle() but safer for user-provided data.
 251          *
 252          * @param int $ns the namespace of the article
 253          * @param string $title the database key form
 254          * @return Title the new object, or NULL on an error
 255          */
 256         public static function makeTitleSafe( $ns, $title ) {
 257                 $t = new Title();
 258                 $t->mDbkeyform = Title::makeName( $ns, $title );
 259                 if( $t->secureAndSplit() ) {
 260                         return $t;
 261                 } else {
 262                         return NULL;
 263                 }
 264         }
 265
 266         /**
 267          * Create a new Title for the Main Page
 268          * @return Title the new object
 269          */
 270         public static function newMainPage() {
 271                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 272                 // Don't give fatal errors if the message is broken
 273                 if ( !$title ) {
 274                         $title = Title::newFromText( 'Main Page' );
 275                 }
 276                 return $title;
 277         }
 278
 279         /**
 280          * Extract a redirect destination from a string and return the
 281          * Title, or null if the text doesn't contain a valid redirect
 282          *
 283          * @param string $text Text with possible redirect
 284          * @return Title
 285          */
 286         public static function newFromRedirect( $text ) {
 287                 $redir = MagicWord::get( 'redirect' );
 288                 if( $redir->matchStart( trim($text) ) ) {
 289                         // Extract the first link and see if it's usable
 290                         $m = array();
 291                         if( preg_match( '!\[{2}(.*?)(?:\||\]{2})!', $text, $m ) ) {
 292                                 // Strip preceding colon used to "escape" categories, etc.
 293                                 // and URL-decode links
 294                                 if( strpos( $m[1], '%' ) !== false ) {
 295                                         // Match behavior of inline link parsing here;
 296                                         // don't interpret + as " " most of the time!
 297                                         // It might be safe to just use rawurldecode instead, though.
 298                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 299                                 }
 300                                 $title = Title::newFromText( $m[1] );
 301                                 // Redirects to Special:Userlogout are not permitted
 302                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 303                                         return $title;
 304                         }
 305                 }
 306                 return null;
 307         }
 308
 309 #----------------------------------------------------------------------------
 310 #       Static functions
 311 #----------------------------------------------------------------------------
 312
 313         /**
 314          * Get the prefixed DB key associated with an ID
 315          * @param int $id the page_id of the article
 316          * @return Title an object representing the article, or NULL
 317          *      if no such article was found
 318          * @static
 319          * @access public
 320          */
 321         function nameOf( $id ) {
 322                 $fname = 'Title::nameOf';
 323                 $dbr = wfGetDB( DB_SLAVE );
 324
 325                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 326                 if ( $s === false ) { return NULL; }
 327
 328                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 329                 return $n;
 330         }
 331
 332         /**
 333          * Get a regex character class describing the legal characters in a link
 334          * @return string the list of characters, not delimited
 335          */
 336         public static function legalChars() {
 337                 global $wgLegalTitleChars;
 338                 return $wgLegalTitleChars;
 339         }
 340
 341         /**
 342          * Get a string representation of a title suitable for
 343          * including in a search index
 344          *
 345          * @param int $ns a namespace index
 346          * @param string $title text-form main part
 347          * @return string a stripped-down title string ready for the
 348          *      search index
 349          */
 350         public static function indexTitle( $ns, $title ) {
 351                 global $wgContLang;
 352
 353                 $lc = SearchEngine::legalSearchChars() . '&#;';
 354                 $t = $wgContLang->stripForSearch( $title );
 355                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 356                 $t = $wgContLang->lc( $t );
 357
 358                 # Handle 's, s'
 359                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 360                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 361
 362                 $t = preg_replace( "/\\s+/", ' ', $t );
 363
 364                 if ( $ns == NS_IMAGE ) {
 365                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 366                 }
 367                 return trim( $t );
 368         }
 369
 370         /*
 371          * Make a prefixed DB key from a DB key and a namespace index
 372          * @param int $ns numerical representation of the namespace
 373          * @param string $title the DB key form the title
 374          * @return string the prefixed form of the title
 375          */
 376         public static function makeName( $ns, $title ) {
 377                 global $wgContLang;
 378
 379                 $n = $wgContLang->getNsText( $ns );
 380                 return $n == '' ? $title : "$n:$title";
 381         }
 382
 383         /**
 384          * Returns the URL associated with an interwiki prefix
 385          * @param string $key the interwiki prefix (e.g. "MeatBall")
 386          * @return the associated URL, containing "$1", which should be
 387          *      replaced by an article title
 388          * @static (arguably)
 389          */
 390         public function getInterwikiLink( $key )  {
 391                 global $wgMemc, $wgInterwikiExpiry;
 392                 global $wgInterwikiCache, $wgContLang;
 393                 $fname = 'Title::getInterwikiLink';
 394
 395                 $key = $wgContLang->lc( $key );
 396
 397                 $k = wfMemcKey( 'interwiki', $key );
 398                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 399                         return Title::$interwikiCache[$k]->iw_url;
 400                 }
 401
 402                 if ($wgInterwikiCache) {
 403                         return Title::getInterwikiCached( $key );
 404                 }
 405
 406                 $s = $wgMemc->get( $k );
 407                 # Ignore old keys with no iw_local
 408                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 409                         Title::$interwikiCache[$k] = $s;
 410                         return $s->iw_url;
 411                 }
 412
 413                 $dbr = wfGetDB( DB_SLAVE );
 414                 $res = $dbr->select( 'interwiki',
 415                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 416                         array( 'iw_prefix' => $key ), $fname );
 417                 if( !$res ) {
 418                         return '';
 419                 }
 420
 421                 $s = $dbr->fetchObject( $res );
 422                 if( !$s ) {
 423                         # Cache non-existence: create a blank object and save it to memcached
 424                         $s = (object)false;
 425                         $s->iw_url = '';
 426                         $s->iw_local = 0;
 427                         $s->iw_trans = 0;
 428                 }
 429                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 430                 Title::$interwikiCache[$k] = $s;
 431
 432                 return $s->iw_url;
 433         }
 434
 435         /**
 436          * Fetch interwiki prefix data from local cache in constant database
 437          *
 438          * More logic is explained in DefaultSettings
 439          *
 440          * @return string URL of interwiki site
 441          */
 442         public static function getInterwikiCached( $key ) {
 443                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 444                 static $db, $site;
 445
 446                 if (!$db)
 447                         $db=dba_open($wgInterwikiCache,'r','cdb');
 448                 /* Resolve site name */
 449                 if ($wgInterwikiScopes>=3 and !$site) {
 450                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 451                         if ($site=="")
 452                                 $site = $wgInterwikiFallbackSite;
 453                 }
 454                 $value = dba_fetch( wfMemcKey( $key ), $db);
 455                 if ($value=='' and $wgInterwikiScopes>=3) {
 456                         /* try site-level */
 457                         $value = dba_fetch("_{$site}:{$key}", $db);
 458                 }
 459                 if ($value=='' and $wgInterwikiScopes>=2) {
 460                         /* try globals */
 461                         $value = dba_fetch("__global:{$key}", $db);
 462                 }
 463                 if ($value=='undef')
 464                         $value='';
 465                 $s = (object)false;
 466                 $s->iw_url = '';
 467                 $s->iw_local = 0;
 468                 $s->iw_trans = 0;
 469                 if ($value!='') {
 470                         list($local,$url)=explode(' ',$value,2);
 471                         $s->iw_url=$url;
 472                         $s->iw_local=(int)$local;
 473                 }
 474                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 475                 return $s->iw_url;
 476         }
 477         /**
 478          * Determine whether the object refers to a page within
 479          * this project.
 480          *
 481          * @return bool TRUE if this is an in-project interwiki link
 482          *      or a wikilink, FALSE otherwise
 483          */
 484         public function isLocal() {
 485                 if ( $this->mInterwiki != '' ) {
 486                         # Make sure key is loaded into cache
 487                         $this->getInterwikiLink( $this->mInterwiki );
 488                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 489                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 490                 } else {
 491                         return true;
 492                 }
 493         }
 494
 495         /**
 496          * Determine whether the object refers to a page within
 497          * this project and is transcludable.
 498          *
 499          * @return bool TRUE if this is transcludable
 500          */
 501         public function isTrans() {
 502                 if ($this->mInterwiki == '')
 503                         return false;
 504                 # Make sure key is loaded into cache
 505                 $this->getInterwikiLink( $this->mInterwiki );
 506                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 507                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 508         }
 509
 510         /**
 511          * Escape a text fragment, say from a link, for a URL
 512          */
 513         static function escapeFragmentForURL( $fragment ) {
 514                 $fragment = str_replace( ' ', '_', $fragment );
 515                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 516                 $replaceArray = array(
 517                         '%3A' => ':',
 518                         '%' => '.'
 519                 );
 520                 return strtr( $fragment, $replaceArray );
 521         }
 522
 523 #----------------------------------------------------------------------------
 524 #       Other stuff
 525 #----------------------------------------------------------------------------
 526
 527         /** Simple accessors */
 528         /**
 529          * Get the text form (spaces not underscores) of the main part
 530          * @return string
 531          */
 532         public function getText() { return $this->mTextform; }
 533         /**
 534          * Get the URL-encoded form of the main part
 535          * @return string
 536          */
 537         public function getPartialURL() { return $this->mUrlform; }
 538         /**
 539          * Get the main part with underscores
 540          * @return string
 541          */
 542         public function getDBkey() { return $this->mDbkeyform; }
 543         /**
 544          * Get the namespace index, i.e. one of the NS_xxxx constants
 545          * @return int
 546          */
 547         public function getNamespace() { return $this->mNamespace; }
 548         /**
 549          * Get the namespace text
 550          * @return string
 551          */
 552         public function getNsText() {
 553                 global $wgContLang, $wgCanonicalNamespaceNames;
 554
 555                 if ( '' != $this->mInterwiki ) {
 556                         // This probably shouldn't even happen. ohh man, oh yuck.
 557                         // But for interwiki transclusion it sometimes does.
 558                         // Shit. Shit shit shit.
 559                         //
 560                         // Use the canonical namespaces if possible to try to
 561                         // resolve a foreign namespace.
 562                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 563                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 564                         }
 565                 }
 566                 return $wgContLang->getNsText( $this->mNamespace );
 567         }
 568         /**
 569          * Get the DB key with the initial letter case as specified by the user
 570          */
 571         function getUserCaseDBKey() {
 572                 return $this->mUserCaseDBKey;
 573         }
 574         /**
 575          * Get the namespace text of the subject (rather than talk) page
 576          * @return string
 577          */
 578         public function getSubjectNsText() {
 579                 global $wgContLang;
 580                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 581         }
 582
 583         /**
 584          * Get the namespace text of the talk page
 585          * @return string
 586          */
 587         public function getTalkNsText() {
 588                 global $wgContLang;
 589                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 590         }
 591
 592         /**
 593          * Could this title have a corresponding talk page?
 594          * @return bool
 595          */
 596         public function canTalk() {
 597                 return( Namespace::canTalk( $this->mNamespace ) );
 598         }
 599
 600         /**
 601          * Get the interwiki prefix (or null string)
 602          * @return string
 603          */
 604         public function getInterwiki() { return $this->mInterwiki; }
 605         /**
 606          * Get the Title fragment (i.e. the bit after the #) in text form
 607          * @return string
 608          */
 609         public function getFragment() { return $this->mFragment; }
 610         /**
 611          * Get the fragment in URL form, including the "#" character if there is one
 612          * @return string
 613          */
 614         public function getFragmentForURL() {
 615                 if ( $this->mFragment == '' ) {
 616                         return '';
 617                 } else {
 618                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 619                 }
 620         }
 621         /**
 622          * Get the default namespace index, for when there is no namespace
 623          * @return int
 624          */
 625         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 626
 627         /**
 628          * Get title for search index
 629          * @return string a stripped-down title string ready for the
 630          *      search index
 631          */
 632         public function getIndexTitle() {
 633                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 634         }
 635
 636         /**
 637          * Get the prefixed database key form
 638          * @return string the prefixed title, with underscores and
 639          *      any interwiki and namespace prefixes
 640          */
 641         public function getPrefixedDBkey() {
 642                 $s = $this->prefix( $this->mDbkeyform );
 643                 $s = str_replace( ' ', '_', $s );
 644                 return $s;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces.
 649          * This is the form usually used for display
 650          * @return string the prefixed title, with spaces
 651          */
 652         public function getPrefixedText() {
 653                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 654                         $s = $this->prefix( $this->mTextform );
 655                         $s = str_replace( '_', ' ', $s );
 656                         $this->mPrefixedText = $s;
 657                 }
 658                 return $this->mPrefixedText;
 659         }
 660
 661         /**
 662          * Get the prefixed title with spaces, plus any fragment
 663          * (part beginning with '#')
 664          * @return string the prefixed title, with spaces and
 665          *      the fragment, including '#'
 666          */
 667         public function getFullText() {
 668                 $text = $this->getPrefixedText();
 669                 if( '' != $this->mFragment ) {
 670                         $text .= '#' . $this->mFragment;
 671                 }
 672                 return $text;
 673         }
 674
 675         /**
 676          * Get the base name, i.e. the leftmost parts before the /
 677          * @return string Base name
 678          */
 679         public function getBaseText() {
 680                 global $wgNamespacesWithSubpages;
 681                 if( !empty( $wgNamespacesWithSubpages[$this->mNamespace] ) ) {
 682                         $parts = explode( '/', $this->getText() );
 683                         # Don't discard the real title if there's no subpage involved
 684                         if( count( $parts ) > 1 )
 685                                 unset( $parts[ count( $parts ) - 1 ] );
 686                         return implode( '/', $parts );
 687                 } else {
 688                         return $this->getText();
 689                 }
 690         }
 691
 692         /**
 693          * Get the lowest-level subpage name, i.e. the rightmost part after /
 694          * @return string Subpage name
 695          */
 696         public function getSubpageText() {
 697                 global $wgNamespacesWithSubpages;
 698                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 699                         $parts = explode( '/', $this->mTextform );
 700                         return( $parts[ count( $parts ) - 1 ] );
 701                 } else {
 702                         return( $this->mTextform );
 703                 }
 704         }
 705
 706         /**
 707          * Get a URL-encoded form of the subpage text
 708          * @return string URL-encoded subpage name
 709          */
 710         public function getSubpageUrlForm() {
 711                 $text = $this->getSubpageText();
 712                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 713                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 714                 return( $text );
 715         }
 716
 717         /**
 718          * Get a URL-encoded title (not an actual URL) including interwiki
 719          * @return string the URL-encoded form
 720          */
 721         public function getPrefixedURL() {
 722                 $s = $this->prefix( $this->mDbkeyform );
 723                 $s = str_replace( ' ', '_', $s );
 724
 725                 $s = wfUrlencode ( $s ) ;
 726
 727                 # Cleaning up URL to make it look nice -- is this safe?
 728                 $s = str_replace( '%28', '(', $s );
 729                 $s = str_replace( '%29', ')', $s );
 730
 731                 return $s;
 732         }
 733
 734         /**
 735          * Get a real URL referring to this title, with interwiki link and
 736          * fragment
 737          *
 738          * @param string $query an optional query string, not used
 739          *      for interwiki links
 740          * @param string $variant language variant of url (for sr, zh..)
 741          * @return string the URL
 742          */
 743         public function getFullURL( $query = '', $variant = false ) {
 744                 global $wgContLang, $wgServer, $wgRequest;
 745
 746                 if ( '' == $this->mInterwiki ) {
 747                         $url = $this->getLocalUrl( $query, $variant );
 748
 749                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 750                         // Correct fix would be to move the prepending elsewhere.
 751                         if ($wgRequest->getVal('action') != 'render') {
 752                                 $url = $wgServer . $url;
 753                         }
 754                 } else {
 755                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 756
 757                         $namespace = wfUrlencode( $this->getNsText() );
 758                         if ( '' != $namespace ) {
 759                                 # Can this actually happen? Interwikis shouldn't be parsed.
 760                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 761                                 $namespace .= ':';
 762                         }
 763                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 764                         $url = wfAppendQuery( $url, $query );
 765                 }
 766
 767                 # Finally, add the fragment.
 768                 $url .= $this->getFragmentForURL();
 769
 770                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 771                 return $url;
 772         }
 773
 774         /**
 775          * Get a URL with no fragment or server name.  If this page is generated
 776          * with action=render, $wgServer is prepended.
 777          * @param string $query an optional query string; if not specified,
 778          *      $wgArticlePath will be used.
 779          * @param string $variant language variant of url (for sr, zh..)
 780          * @return string the URL
 781          */
 782         public function getLocalURL( $query = '', $variant = false ) {
 783                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 784                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 785
 786                 // internal links should point to same variant as current page (only anonymous users)
 787                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 788                         $pref = $wgContLang->getPreferredVariant(false);
 789                         if($pref != $wgContLang->getCode())
 790                                 $variant = $pref;
 791                 }
 792
 793                 if ( $this->isExternal() ) {
 794                         $url = $this->getFullURL();
 795                         if ( $query ) {
 796                                 // This is currently only used for edit section links in the
 797                                 // context of interwiki transclusion. In theory we should
 798                                 // append the query to the end of any existing query string,
 799                                 // but interwiki transclusion is already broken in that case.
 800                                 $url .= "?$query";
 801                         }
 802                 } else {
 803                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 804                         if ( $query == '' ) {
 805                                 if( $variant != false && $wgContLang->hasVariants() ) {
 806                                         if( $wgVariantArticlePath == false ) {
 807                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 808                                         } else {
 809                                                 $variantArticlePath = $wgVariantArticlePath;
 810                                         }
 811                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 812                                         $url = str_replace( '$1', $dbkey, $url  );
 813                                 } else {
 814                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 815                                 }
 816                         } else {
 817                                 global $wgActionPaths;
 818                                 $url = false;
 819                                 $matches = array();
 820                                 if( !empty( $wgActionPaths ) &&
 821                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 822                                 {
 823                                         $action = urldecode( $matches[2] );
 824                                         if( isset( $wgActionPaths[$action] ) ) {
 825                                                 $query = $matches[1];
 826                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 827                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 828                                                 if( $query != '' ) $url .= '?' . $query;
 829                                         }
 830                                 }
 831                                 if ( $url === false ) {
 832                                         if ( $query == '-' ) {
 833                                                 $query = '';
 834                                         }
 835                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 836                                 }
 837                         }
 838
 839                         // FIXME: this causes breakage in various places when we
 840                         // actually expected a local URL and end up with dupe prefixes.
 841                         if ($wgRequest->getVal('action') == 'render') {
 842                                 $url = $wgServer . $url;
 843                         }
 844                 }
 845                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 846                 return $url;
 847         }
 848
 849         /**
 850          * Get an HTML-escaped version of the URL form, suitable for
 851          * using in a link, without a server name or fragment
 852          * @param string $query an optional query string
 853          * @return string the URL
 854          */
 855         public function escapeLocalURL( $query = '' ) {
 856                 return htmlspecialchars( $this->getLocalURL( $query ) );
 857         }
 858
 859         /**
 860          * Get an HTML-escaped version of the URL form, suitable for
 861          * using in a link, including the server name and fragment
 862          *
 863          * @return string the URL
 864          * @param string $query an optional query string
 865          */
 866         public function escapeFullURL( $query = '' ) {
 867                 return htmlspecialchars( $this->getFullURL( $query ) );
 868         }
 869
 870         /**
 871          * Get the URL form for an internal link.
 872          * - Used in various Squid-related code, in case we have a different
 873          * internal hostname for the server from the exposed one.
 874          *
 875          * @param string $query an optional query string
 876          * @param string $variant language variant of url (for sr, zh..)
 877          * @return string the URL
 878          */
 879         public function getInternalURL( $query = '', $variant = false ) {
 880                 global $wgInternalServer;
 881                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 882                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 883                 return $url;
 884         }
 885
 886         /**
 887          * Get the edit URL for this Title
 888          * @return string the URL, or a null string if this is an
 889          *      interwiki link
 890          */
 891         public function getEditURL() {
 892                 if ( '' != $this->mInterwiki ) { return ''; }
 893                 $s = $this->getLocalURL( 'action=edit' );
 894
 895                 return $s;
 896         }
 897
 898         /**
 899          * Get the HTML-escaped displayable text form.
 900          * Used for the title field in <a> tags.
 901          * @return string the text, including any prefixes
 902          */
 903         public function getEscapedText() {
 904                 return htmlspecialchars( $this->getPrefixedText() );
 905         }
 906
 907         /**
 908          * Is this Title interwiki?
 909          * @return boolean
 910          */
 911         public function isExternal() { return ( '' != $this->mInterwiki ); }
 912
 913         /**
 914          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 915          *
 916          * @param string Action to check (default: edit)
 917          * @return bool
 918          */
 919         public function isSemiProtected( $action = 'edit' ) {
 920                 if( $this->exists() ) {
 921                         $restrictions = $this->getRestrictions( $action );
 922                         if( count( $restrictions ) > 0 ) {
 923                                 foreach( $restrictions as $restriction ) {
 924                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 925                                                 return false;
 926                                 }
 927                         } else {
 928                                 # Not protected
 929                                 return false;
 930                         }
 931                         return true;
 932                 } else {
 933                         # If it doesn't exist, it can't be protected
 934                         return false;
 935                 }
 936         }
 937
 938         /**
 939          * Does the title correspond to a protected article?
 940          * @param string $what the action the page is protected from,
 941          * by default checks move and edit
 942          * @return boolean
 943          */
 944         public function isProtected( $action = '' ) {
 945                 global $wgRestrictionLevels, $wgRestrictionTypes;
 946
 947                 # Special pages have inherent protection
 948                 if( $this->getNamespace() == NS_SPECIAL )
 949                         return true;
 950
 951                 # Check regular protection levels
 952                 foreach( $wgRestrictionTypes as $type ){
 953                         if( $action == $type || $action == '' ) {
 954                                 $r = $this->getRestrictions( $type );
 955                                 foreach( $wgRestrictionLevels as $level ) {
 956                                         if( in_array( $level, $r ) && $level != '' ) {
 957                                                 return true;
 958                                         }
 959                                 }
 960                         }
 961                 }
 962
 963                 return false;
 964         }
 965
 966         /**
 967          * Is $wgUser watching this page?
 968          * @return boolean
 969          */
 970         public function userIsWatching() {
 971                 global $wgUser;
 972
 973                 if ( is_null( $this->mWatched ) ) {
 974                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 975                                 $this->mWatched = false;
 976                         } else {
 977                                 $this->mWatched = $wgUser->isWatched( $this );
 978                         }
 979                 }
 980                 return $this->mWatched;
 981         }
 982
 983         /**
 984          * Can $wgUser perform $action on this page?
 985          * This skips potentially expensive cascading permission checks.
 986          *
 987          * Suitable for use for nonessential UI controls in common cases, but
 988          * _not_ for functional access control.
 989          *
 990          * May provide false positives, but should never provide a false negative.
 991          *
 992          * @param string $action action that permission needs to be checked for
 993          * @return boolean
 994          */
 995         public function quickUserCan( $action ) {
 996                 return $this->userCan( $action, false );
 997         }
 998
 999         /**
1000          * Determines if $wgUser is unable to edit this page because it has been protected
1001          * by $wgNamespaceProtection.
1002          *
1003          * @return boolean
1004          */
1005         public function isNamespaceProtected() {
1006                 global $wgNamespaceProtection, $wgUser;
1007                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1008                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1009                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1010                                         return true;
1011                         }
1012                 }
1013                 return false;
1014         }
1015
1016         /**
1017          * Can $wgUser perform $action on this page?
1018          * @param string $action action that permission needs to be checked for
1019          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1020          * @return boolean
1021          */
1022         public function userCan( $action, $doExpensiveQueries = true ) {
1023                 global $wgUser;
1024                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1025         }
1026
1027         /**
1028          * Can $user perform $action on this page?
1029          *
1030          * FIXME: This *does not* check throttles (User::pingLimiter()).
1031          *
1032          * @param string $action action that permission needs to be checked for
1033          * @param User $user user to check
1034          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1035          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1036          */
1037         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1038                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1039
1040                 global $wgContLang;
1041                 global $wgLang;
1042                 global $wgEmailConfirmToEdit;
1043
1044                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1045                         $errors[] = array( 'confirmedittext' );
1046                 }
1047
1048                 if ( $user->isBlockedFrom( $this ) ) {
1049                         $block = $user->mBlock;
1050
1051                         // This is from OutputPage::blockedPage
1052                         // Copied at r23888 by werdna
1053
1054                         $id = $user->blockedBy();
1055                         $reason = $user->blockedFor();
1056                         if( $reason == '' ) {
1057                                 $reason = wfMsg( 'blockednoreason' );
1058                         }
1059                         $ip = wfGetIP();
1060
1061                         if ( is_numeric( $id ) ) {
1062                                 $name = User::whoIs( $id );
1063                         } else {
1064                                 $name = $id;
1065                         }
1066
1067                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1068                         $blockid = $block->mId;
1069                         $blockExpiry = $user->mBlock->mExpiry;
1070                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1071
1072                         if ( $blockExpiry == 'infinity' ) {
1073                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1074                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1075
1076                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1077                                         if ( strpos( $option, ':' ) == false )
1078                                                 continue;
1079
1080                                         list ($show, $value) = explode( ":", $option );
1081
1082                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1083                                                 $blockExpiry = $show;
1084                                                 break;
1085                                         }
1086                                 }
1087                         } else {
1088                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1089                         }
1090
1091                         $intended = $user->mBlock->mAddress;
1092
1093                         $errors[] = array ( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1094                 }
1095
1096                 return $errors;
1097         }
1098
1099         /**
1100          * Can $user perform $action on this page? This is an internal function,
1101          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1102          * checks on wfReadOnly() and blocks)
1103          *
1104          * @param string $action action that permission needs to be checked for
1105          * @param User $user user to check
1106          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1107          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1108          */
1109         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1110                 wfProfileIn( __METHOD__ );
1111
1112                 $errors = array();
1113
1114                 // Use getUserPermissionsErrors instead
1115                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1116                         return $result ? array() : array( array( 'badaccess-group0' ) );
1117                 }
1118
1119                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1120                         if ($result != array() && is_array($result) && !is_array($result[0]))
1121                                 $errors[] = $result; # A single array representing an error
1122                         else if (is_array($result) && is_array($result[0]))
1123                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1124                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1125                                 $errors[] = array($result); # A string representing a message-id
1126                         else if ($result === false )
1127                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1128                 }
1129                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1130                         if ($result != array() && is_array($result) && !is_array($result[0]))
1131                                 $errors[] = $result; # A single array representing an error
1132                         else if (is_array($result) && is_array($result[0]))
1133                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1134                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1135                                 $errors[] = array($result); # A string representing a message-id
1136                         else if ($result === false )
1137                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1138                 }
1139
1140                 if( NS_SPECIAL == $this->mNamespace ) {
1141                         $errors[] = array('ns-specialprotected');
1142                 }
1143
1144                 if ( $this->isNamespaceProtected() ) {
1145                         $ns = $this->getNamespace() == NS_MAIN
1146                                 ? wfMsg( 'nstab-main' )
1147                                 : $this->getNsText();
1148                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1149                                 ? array('protectedinterface')
1150                                 : array( 'namespaceprotected',  $ns ) );
1151                 }
1152
1153                 if( $this->mDbkeyform == '_' ) {
1154                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1155                         $errors[] = array('badaccess-group0');
1156                 }
1157
1158                 # protect css/js subpages of user pages
1159                 # XXX: this might be better using restrictions
1160                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1161                 if( $this->isCssJsSubpage()
1162                         && !$user->isAllowed('editusercssjs')
1163                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1164                         $errors[] = array('customcssjsprotected');
1165                 }
1166
1167                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1168                         # We /could/ use the protection level on the source page, but it's fairly ugly
1169                         #  as we have to establish a precedence hierarchy for pages included by multiple
1170                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1171                         #  as they could remove the protection anyway.
1172                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1173                         # Cascading protection depends on more than this page...
1174                         # Several cascading protected pages may include this page...
1175                         # Check each cascading level
1176                         # This is only for protection restrictions, not for all actions
1177                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1178                                 foreach( $restrictions[$action] as $right ) {
1179                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1180                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1181                                                 $pages = '';
1182                                                 foreach( $cascadingSources as $page )
1183                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1184                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1185                                         }
1186                                 }
1187                         }
1188                 }
1189
1190                 foreach( $this->getRestrictions($action) as $right ) {
1191                         // Backwards compatibility, rewrite sysop -> protect
1192                         if ( $right == 'sysop' ) {
1193                                 $right = 'protect';
1194                         }
1195                         if( '' != $right && !$user->isAllowed( $right ) ) {
1196                                 $errors[] = array( 'protectedpagetext', $right );
1197                         }
1198                 }
1199
1200                 if ($action == 'protect') {
1201                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1202                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1203                         }
1204                 }
1205
1206                 if ($action == 'create') {
1207                         $title_protection = $this->getTitleProtection();
1208
1209                         if (is_array($title_protection)) {
1210                                 extract($title_protection);
1211
1212                                 if ($pt_create_perm == 'sysop')
1213                                         $pt_create_perm = 'protect';
1214
1215                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1216                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1217                                 }
1218                         }
1219
1220                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1221                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1222                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1223                         }
1224                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1225                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1226                 } elseif ( !$user->isAllowed( $action ) ) {
1227                         $return = null;
1228                         $groups = array();
1229                         global $wgGroupPermissions;
1230                         foreach( $wgGroupPermissions as $key => $value ) {
1231                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1232                                         $groupName = User::getGroupName( $key );
1233                                         $groupPage = User::getGroupPage( $key );
1234                                         if( $groupPage ) {
1235                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1236                                         } else {
1237                                                 $groups[] = $groupName;
1238                                         }
1239                                 }
1240                         }
1241                         $n = count( $groups );
1242                         $groups = implode( ', ', $groups );
1243                         switch( $n ) {
1244                                 case 0:
1245                                 case 1:
1246                                 case 2:
1247                                         $return = array( "badaccess-group$n", $groups );
1248                                         break;
1249                                 default:
1250                                         $return = array( 'badaccess-groups', $groups );
1251                         }
1252                         $errors[] = $return;
1253                 }
1254
1255                 wfProfileOut( __METHOD__ );
1256                 return $errors;
1257         }
1258
1259         /**
1260          * Is this title subject to title protection?
1261          * @return mixed An associative array representing any existent title
1262          *   protection, or false if there's none.
1263          */
1264         private function getTitleProtection() {
1265                 // Can't protect pages in special namespaces
1266                 if ( $this->getNamespace() < 0 ) {
1267                         return false;
1268                 }
1269
1270                 $dbr = wfGetDB( DB_SLAVE );
1271                 $res = $dbr->select( 'protected_titles', '*',
1272                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1273
1274                 if ($row = $dbr->fetchRow( $res )) {
1275                         return $row;
1276                 } else {
1277                         return false;
1278                 }
1279         }
1280
1281         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1282                 global $wgGroupPermissions,$wgUser,$wgContLang;
1283
1284                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1285                         && $expiry == $this->mRestrictionsExpiry) {
1286                         // No change
1287                         return true;
1288                 }
1289
1290                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1291
1292                 $dbw = wfGetDB( DB_MASTER );
1293
1294                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1295
1296                 $expiry_description = '';
1297                 if ( $encodedExpiry != 'infinity' ) {
1298                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1299                 }
1300
1301                 # Update protection table
1302                 if ($create_perm != '' ) {
1303                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1304                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1305                                         , 'pt_create_perm' => $create_perm
1306                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1307                                         , 'pt_expiry' => $encodedExpiry
1308                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1309                 } else {
1310                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1311                                 'pt_title' => $title ), __METHOD__ );
1312                 }
1313                 # Update the protection log
1314                 $log = new LogPage( 'protect' );
1315
1316                 if( $create_perm ) {
1317                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1318                 } else {
1319                         $log->addEntry( 'unprotect', $this, $reason );
1320                 }
1321
1322                 return true;
1323         }
1324
1325         /**
1326          * Remove any title protection (due to page existing
1327          */
1328         public function deleteTitleProtection() {
1329                 $dbw = wfGetDB( DB_MASTER );
1330
1331                 $dbw->delete( 'protected_titles',
1332                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1333         }
1334
1335         /**
1336          * Can $wgUser edit this page?
1337          * @return boolean
1338          * @deprecated use userCan('edit')
1339          */
1340         public function userCanEdit( $doExpensiveQueries = true ) {
1341                 return $this->userCan( 'edit', $doExpensiveQueries );
1342         }
1343
1344         /**
1345          * Can $wgUser create this page?
1346          * @return boolean
1347          * @deprecated use userCan('create')
1348          */
1349         public function userCanCreate( $doExpensiveQueries = true ) {
1350                 return $this->userCan( 'create', $doExpensiveQueries );
1351         }
1352
1353         /**
1354          * Can $wgUser move this page?
1355          * @return boolean
1356          * @deprecated use userCan('move')
1357          */
1358         public function userCanMove( $doExpensiveQueries = true ) {
1359                 return $this->userCan( 'move', $doExpensiveQueries );
1360         }
1361
1362         /**
1363          * Would anybody with sufficient privileges be able to move this page?
1364          * Some pages just aren't movable.
1365          *
1366          * @return boolean
1367          */
1368         public function isMovable() {
1369                 return Namespace::isMovable( $this->getNamespace() )
1370                         && $this->getInterwiki() == '';
1371         }
1372
1373         /**
1374          * Can $wgUser read this page?
1375          * @return boolean
1376          * @todo fold these checks into userCan()
1377          */
1378         public function userCanRead() {
1379                 global $wgUser, $wgGroupPermissions;
1380
1381                 # Shortcut for public wikis, allows skipping quite a bit of code path
1382                 if ($wgGroupPermissions['*']['read'])
1383                         return true;
1384
1385                 $result = null;
1386                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1387                 if ( $result !== null ) {
1388                         return $result;
1389                 }
1390
1391                 if( $wgUser->isAllowed( 'read' ) ) {
1392                         return true;
1393                 } else {
1394                         global $wgWhitelistRead;
1395
1396                         /**
1397                          * Always grant access to the login page.
1398                          * Even anons need to be able to log in.
1399                         */
1400                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1401                                 return true;
1402                         }
1403
1404                         /**
1405                          * Bail out if there isn't whitelist
1406                          */
1407                         if( !is_array($wgWhitelistRead) ) {
1408                                 return false;
1409                         }
1410
1411                         /**
1412                          * Check for explicit whitelisting
1413                          */
1414                         $name = $this->getPrefixedText();
1415                         if( in_array( $name, $wgWhitelistRead, true ) )
1416                                 return true;
1417
1418                         /**
1419                          * Old settings might have the title prefixed with
1420                          * a colon for main-namespace pages
1421                          */
1422                         if( $this->getNamespace() == NS_MAIN ) {
1423                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1424                                         return true;
1425                         }
1426
1427                         /**
1428                          * If it's a special page, ditch the subpage bit
1429                          * and check again
1430                          */
1431                         if( $this->getNamespace() == NS_SPECIAL ) {
1432                                 $name = $this->getDBkey();
1433                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1434                                 if ( $name === false ) {
1435                                         # Invalid special page, but we show standard login required message
1436                                         return false;
1437                                 }
1438
1439                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1440                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1441                                         return true;
1442                         }
1443
1444                 }
1445                 return false;
1446         }
1447
1448         /**
1449          * Is this a talk page of some sort?
1450          * @return bool
1451          */
1452         public function isTalkPage() {
1453                 return Namespace::isTalk( $this->getNamespace() );
1454         }
1455
1456         /**
1457          * Is this a subpage?
1458          * @return bool
1459          */
1460         public function isSubpage() {
1461                 global $wgNamespacesWithSubpages;
1462
1463                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1464                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1465                 } else {
1466                         return false;
1467                 }
1468         }
1469
1470         /**
1471          * Could this page contain custom CSS or JavaScript, based
1472          * on the title?
1473          *
1474          * @return bool
1475          */
1476         public function isCssOrJsPage() {
1477                 return $this->mNamespace == NS_MEDIAWIKI
1478                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1479         }
1480
1481         /**
1482          * Is this a .css or .js subpage of a user page?
1483          * @return bool
1484          */
1485         public function isCssJsSubpage() {
1486                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1487         }
1488         /**
1489          * Is this a *valid* .css or .js subpage of a user page?
1490          * Check that the corresponding skin exists
1491          */
1492         public function isValidCssJsSubpage() {
1493                 if ( $this->isCssJsSubpage() ) {
1494                         $skinNames = Skin::getSkinNames();
1495                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1496                 } else {
1497                         return false;
1498                 }
1499         }
1500         /**
1501          * Trim down a .css or .js subpage title to get the corresponding skin name
1502          */
1503         public function getSkinFromCssJsSubpage() {
1504                 $subpage = explode( '/', $this->mTextform );
1505                 $subpage = $subpage[ count( $subpage ) - 1 ];
1506                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1507         }
1508         /**
1509          * Is this a .css subpage of a user page?
1510          * @return bool
1511          */
1512         public function isCssSubpage() {
1513                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1514         }
1515         /**
1516          * Is this a .js subpage of a user page?
1517          * @return bool
1518          */
1519         public function isJsSubpage() {
1520                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1521         }
1522         /**
1523          * Protect css/js subpages of user pages: can $wgUser edit
1524          * this page?
1525          *
1526          * @return boolean
1527          * @todo XXX: this might be better using restrictions
1528          */
1529         public function userCanEditCssJsSubpage() {
1530                 global $wgUser;
1531                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1532         }
1533
1534         /**
1535          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1536          *
1537          * @return bool If the page is subject to cascading restrictions.
1538          */
1539         public function isCascadeProtected() {
1540                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1541                 return ( $sources > 0 );
1542         }
1543
1544         /**
1545          * Cascading protection: Get the source of any cascading restrictions on this page.
1546          *
1547          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1548          * @return array( mixed title array, restriction array)
1549          * Array of the Title objects of the pages from which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1550          * The restriction array is an array of each type, each of which contains an array of unique groups
1551          */
1552         public function getCascadeProtectionSources( $get_pages = true ) {
1553                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1554
1555                 # Define our dimension of restrictions types
1556                 $pagerestrictions = array();
1557                 foreach( $wgRestrictionTypes as $action )
1558                         $pagerestrictions[$action] = array();
1559
1560                 if (!$wgEnableCascadingProtection)
1561                         return array( false, $pagerestrictions );
1562
1563                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1564                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1565                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1566                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1567                 }
1568
1569                 wfProfileIn( __METHOD__ );
1570
1571                 $dbr = wfGetDb( DB_SLAVE );
1572
1573                 if ( $this->getNamespace() == NS_IMAGE ) {
1574                         $tables = array ('imagelinks', 'page_restrictions');
1575                         $where_clauses = array(
1576                                 'il_to' => $this->getDBkey(),
1577                                 'il_from=pr_page',
1578                                 'pr_cascade' => 1 );
1579                 } else {
1580                         $tables = array ('templatelinks', 'page_restrictions');
1581                         $where_clauses = array(
1582                                 'tl_namespace' => $this->getNamespace(),
1583                                 'tl_title' => $this->getDBkey(),
1584                                 'tl_from=pr_page',
1585                                 'pr_cascade' => 1 );
1586                 }
1587
1588                 if ( $get_pages ) {
1589                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1590                         $where_clauses[] = 'page_id=pr_page';
1591                         $tables[] = 'page';
1592                 } else {
1593                         $cols = array( 'pr_expiry' );
1594                 }
1595
1596                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1597
1598                 $sources = $get_pages ? array() : false;
1599                 $now = wfTimestampNow();
1600                 $purgeExpired = false;
1601
1602                 while( $row = $dbr->fetchObject( $res ) ) {
1603                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1604                         if( $expiry > $now ) {
1605                                 if ($get_pages) {
1606                                         $page_id = $row->pr_page;
1607                                         $page_ns = $row->page_namespace;
1608                                         $page_title = $row->page_title;
1609                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1610                                         # Add groups needed for each restriction type if its not already there
1611                                         # Make sure this restriction type still exists
1612                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1613                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1614                                         }
1615                                 } else {
1616                                         $sources = true;
1617                                 }
1618                         } else {
1619                                 // Trigger lazy purge of expired restrictions from the db
1620                                 $purgeExpired = true;
1621                         }
1622                 }
1623                 if( $purgeExpired ) {
1624                         Title::purgeExpiredRestrictions();
1625                 }
1626
1627                 wfProfileOut( __METHOD__ );
1628
1629                 if ( $get_pages ) {
1630                         $this->mCascadeSources = $sources;
1631                         $this->mCascadingRestrictions = $pagerestrictions;
1632                 } else {
1633                         $this->mHasCascadingRestrictions = $sources;
1634                 }
1635
1636                 return array( $sources, $pagerestrictions );
1637         }
1638
1639         function areRestrictionsCascading() {
1640                 if (!$this->mRestrictionsLoaded) {
1641                         $this->loadRestrictions();
1642                 }
1643
1644                 return $this->mCascadeRestriction;
1645         }
1646
1647         /**
1648          * Loads a string into mRestrictions array
1649          * @param resource $res restrictions as an SQL result.
1650          */
1651         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1652                 global $wgRestrictionTypes;
1653                 $dbr = wfGetDB( DB_SLAVE );
1654
1655                 foreach( $wgRestrictionTypes as $type ){
1656                         $this->mRestrictions[$type] = array();
1657                 }
1658
1659                 $this->mCascadeRestriction = false;
1660                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1661
1662                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1663
1664                 if ( $oldFashionedRestrictions == NULL ) {
1665                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1666                 }
1667
1668                 if ($oldFashionedRestrictions != '') {
1669
1670                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1671                                 $temp = explode( '=', trim( $restrict ) );
1672                                 if(count($temp) == 1) {
1673                                         // old old format should be treated as edit/move restriction
1674                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1675                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1676                                 } else {
1677                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1678                                 }
1679                         }
1680
1681                         $this->mOldRestrictions = true;
1682
1683                 }
1684
1685                 if( $dbr->numRows( $res ) ) {
1686                         # Current system - load second to make them override.
1687                         $now = wfTimestampNow();
1688                         $purgeExpired = false;
1689
1690                         while ($row = $dbr->fetchObject( $res ) ) {
1691                                 # Cycle through all the restrictions.
1692
1693                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1694                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1695                                         continue;
1696
1697                                 // This code should be refactored, now that it's being used more generally,
1698                                 // But I don't really see any harm in leaving it in Block for now -werdna
1699                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1700
1701                                 // Only apply the restrictions if they haven't expired!
1702                                 if ( !$expiry || $expiry > $now ) {
1703                                         $this->mRestrictionsExpiry = $expiry;
1704                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1705
1706                                         $this->mCascadeRestriction |= $row->pr_cascade;
1707                                 } else {
1708                                         // Trigger a lazy purge of expired restrictions
1709                                         $purgeExpired = true;
1710                                 }
1711                         }
1712
1713                         if( $purgeExpired ) {
1714                                 Title::purgeExpiredRestrictions();
1715                         }
1716                 }
1717
1718                 $this->mRestrictionsLoaded = true;
1719         }
1720
1721         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1722                 if( !$this->mRestrictionsLoaded ) {
1723                         if ($this->exists()) {
1724                                 $dbr = wfGetDB( DB_SLAVE );
1725
1726                                 $res = $dbr->select( 'page_restrictions', '*',
1727                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1728
1729                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1730                         } else {
1731                                 $title_protection = $this->getTitleProtection();
1732
1733                                 if (is_array($title_protection)) {
1734                                         extract($title_protection);
1735
1736                                         $now = wfTimestampNow();
1737                                         $expiry = Block::decodeExpiry($pt_expiry);
1738
1739                                         if (!$expiry || $expiry > $now) {
1740                                                 // Apply the restrictions
1741                                                 $this->mRestrictionsExpiry = $expiry;
1742                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1743                                         } else { // Get rid of the old restrictions
1744                                                 Title::purgeExpiredRestrictions();
1745                                         }
1746                                 }
1747                                 $this->mRestrictionsLoaded = true;
1748                         }
1749                 }
1750         }
1751
1752         /**
1753          * Purge expired restrictions from the page_restrictions table
1754          */
1755         static function purgeExpiredRestrictions() {
1756                 $dbw = wfGetDB( DB_MASTER );
1757                 $dbw->delete( 'page_restrictions',
1758                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1759                         __METHOD__ );
1760
1761                 $dbw->delete( 'protected_titles',
1762                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1763                         __METHOD__ );
1764         }
1765
1766         /**
1767          * Accessor/initialisation for mRestrictions
1768          *
1769          * @param string $action action that permission needs to be checked for
1770          * @return array the array of groups allowed to edit this article
1771          */
1772         public function getRestrictions( $action ) {
1773                 if( !$this->mRestrictionsLoaded ) {
1774                         $this->loadRestrictions();
1775                 }
1776                 return isset( $this->mRestrictions[$action] )
1777                                 ? $this->mRestrictions[$action]
1778                                 : array();
1779         }
1780
1781         /**
1782          * Is there a version of this page in the deletion archive?
1783          * @return int the number of archived revisions
1784          */
1785         public function isDeleted() {
1786                 $fname = 'Title::isDeleted';
1787                 if ( $this->getNamespace() < 0 ) {
1788                         $n = 0;
1789                 } else {
1790                         $dbr = wfGetDB( DB_SLAVE );
1791                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1792                                 'ar_title' => $this->getDBkey() ), $fname );
1793                         if( $this->getNamespace() == NS_IMAGE ) {
1794                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1795                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1796                         }
1797                 }
1798                 return (int)$n;
1799         }
1800
1801         /**
1802          * Get the article ID for this Title from the link cache,
1803          * adding it if necessary
1804          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1805          *      for update
1806          * @return int the ID
1807          */
1808         public function getArticleID( $flags = 0 ) {
1809                 $linkCache =& LinkCache::singleton();
1810                 if ( $flags & GAID_FOR_UPDATE ) {
1811                         $oldUpdate = $linkCache->forUpdate( true );
1812                         $this->mArticleID = $linkCache->addLinkObj( $this );
1813                         $linkCache->forUpdate( $oldUpdate );
1814                 } else {
1815                         if ( -1 == $this->mArticleID ) {
1816                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1817                         }
1818                 }
1819                 return $this->mArticleID;
1820         }
1821
1822         public function getLatestRevID() {
1823                 if ($this->mLatestID !== false)
1824                         return $this->mLatestID;
1825
1826                 $db = wfGetDB(DB_SLAVE);
1827                 return $this->mLatestID = $db->selectField( 'revision',
1828                         "max(rev_id)",
1829                         array('rev_page' => $this->getArticleID()),
1830                         'Title::getLatestRevID' );
1831         }
1832
1833         /**
1834          * This clears some fields in this object, and clears any associated
1835          * keys in the "bad links" section of the link cache.
1836          *
1837          * - This is called from Article::insertNewArticle() to allow
1838          * loading of the new page_id. It's also called from
1839          * Article::doDeleteArticle()
1840          *
1841          * @param int $newid the new Article ID
1842          */
1843         public function resetArticleID( $newid ) {
1844                 $linkCache =& LinkCache::singleton();
1845                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1846
1847                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1848                 else { $this->mArticleID = $newid; }
1849                 $this->mRestrictionsLoaded = false;
1850                 $this->mRestrictions = array();
1851         }
1852
1853         /**
1854          * Updates page_touched for this page; called from LinksUpdate.php
1855          * @return bool true if the update succeded
1856          */
1857         public function invalidateCache() {
1858                 global $wgUseFileCache;
1859
1860                 if ( wfReadOnly() ) {
1861                         return;
1862                 }
1863
1864                 $dbw = wfGetDB( DB_MASTER );
1865                 $success = $dbw->update( 'page',
1866                         array( /* SET */
1867                                 'page_touched' => $dbw->timestamp()
1868                         ), array( /* WHERE */
1869                                 'page_namespace' => $this->getNamespace() ,
1870                                 'page_title' => $this->getDBkey()
1871                         ), 'Title::invalidateCache'
1872                 );
1873
1874                 if ($wgUseFileCache) {
1875                         $cache = new HTMLFileCache($this);
1876                         @unlink($cache->fileCacheName());
1877                 }
1878
1879                 return $success;
1880         }
1881
1882         /**
1883          * Prefix some arbitrary text with the namespace or interwiki prefix
1884          * of this object
1885          *
1886          * @param string $name the text
1887          * @return string the prefixed text
1888          * @private
1889          */
1890         /* private */ function prefix( $name ) {
1891                 $p = '';
1892                 if ( '' != $this->mInterwiki ) {
1893                         $p = $this->mInterwiki . ':';
1894                 }
1895                 if ( 0 != $this->mNamespace ) {
1896                         $p .= $this->getNsText() . ':';
1897                 }
1898                 return $p . $name;
1899         }
1900
1901         /**
1902          * Secure and split - main initialisation function for this object
1903          *
1904          * Assumes that mDbkeyform has been set, and is urldecoded
1905          * and uses underscores, but not otherwise munged.  This function
1906          * removes illegal characters, splits off the interwiki and
1907          * namespace prefixes, sets the other forms, and canonicalizes
1908          * everything.
1909          * @return bool true on success
1910          */
1911         private function secureAndSplit() {
1912                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1913
1914                 # Initialisation
1915                 static $rxTc = false;
1916                 if( !$rxTc ) {
1917                         # Matching titles will be held as illegal.
1918                         $rxTc = '/' .
1919                                 # Any character not allowed is forbidden...
1920                                 '[^' . Title::legalChars() . ']' .
1921                                 # URL percent encoding sequences interfere with the ability
1922                                 # to round-trip titles -- you can't link to them consistently.
1923                                 '|%[0-9A-Fa-f]{2}' .
1924                                 # XML/HTML character references produce similar issues.
1925                                 '|&[A-Za-z0-9\x80-\xff]+;' .
1926                                 '|&#[0-9]+;' .
1927                                 '|&#x[0-9A-Fa-f]+;' .
1928                                 '/S';
1929                 }
1930
1931                 $this->mInterwiki = $this->mFragment = '';
1932                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1933
1934                 $dbkey = $this->mDbkeyform;
1935
1936                 # Strip Unicode bidi override characters.
1937                 # Sometimes they slip into cut-n-pasted page titles, where the
1938                 # override chars get included in list displays.
1939                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1940                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1941
1942                 # Clean up whitespace
1943                 #
1944                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1945                 $dbkey = trim( $dbkey, '_' );
1946
1947                 if ( '' == $dbkey ) {
1948                         return false;
1949                 }
1950
1951                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1952                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1953                         return false;
1954                 }
1955
1956                 $this->mDbkeyform = $dbkey;
1957
1958                 # Initial colon indicates main namespace rather than specified default
1959                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1960                 if ( ':' == $dbkey{0} ) {
1961                         $this->mNamespace = NS_MAIN;
1962                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1963                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
1964                 }
1965
1966                 # Namespace or interwiki prefix
1967                 $firstPass = true;
1968                 do {
1969                         $m = array();
1970                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1971                                 $p = $m[1];
1972                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
1973                                         # Ordinary namespace
1974                                         $dbkey = $m[2];
1975                                         $this->mNamespace = $ns;
1976                                 } elseif( $this->getInterwikiLink( $p ) ) {
1977                                         if( !$firstPass ) {
1978                                                 # Can't make a local interwiki link to an interwiki link.
1979                                                 # That's just crazy!
1980                                                 return false;
1981                                         }
1982
1983                                         # Interwiki link
1984                                         $dbkey = $m[2];
1985                                         $this->mInterwiki = $wgContLang->lc( $p );
1986
1987                                         # Redundant interwiki prefix to the local wiki
1988                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1989                                                 if( $dbkey == '' ) {
1990                                                         # Can't have an empty self-link
1991                                                         return false;
1992                                                 }
1993                                                 $this->mInterwiki = '';
1994                                                 $firstPass = false;
1995                                                 # Do another namespace split...
1996                                                 continue;
1997                                         }
1998
1999                                         # If there's an initial colon after the interwiki, that also
2000                                         # resets the default namespace
2001                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2002                                                 $this->mNamespace = NS_MAIN;
2003                                                 $dbkey = substr( $dbkey, 1 );
2004                                         }
2005                                 }
2006                                 # If there's no recognized interwiki or namespace,
2007                                 # then let the colon expression be part of the title.
2008                         }
2009                         break;
2010                 } while( true );
2011
2012                 # We already know that some pages won't be in the database!
2013                 #
2014                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2015                         $this->mArticleID = 0;
2016                 }
2017                 $fragment = strstr( $dbkey, '#' );
2018                 if ( false !== $fragment ) {
2019                         $this->setFragment( $fragment );
2020                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2021                         # remove whitespace again: prevents "Foo_bar_#"
2022                         # becoming "Foo_bar_"
2023                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2024                 }
2025
2026                 # Reject illegal characters.
2027                 #
2028                 if( preg_match( $rxTc, $dbkey ) ) {
2029                         return false;
2030                 }
2031
2032                 /**
2033                  * Pages with "/./" or "/../" appearing in the URLs will
2034                  * often be unreachable due to the way web browsers deal
2035                  * with 'relative' URLs. Forbid them explicitly.
2036                  */
2037                 if ( strpos( $dbkey, '.' ) !== false &&
2038                      ( $dbkey === '.' || $dbkey === '..' ||
2039                        strpos( $dbkey, './' ) === 0  ||
2040                        strpos( $dbkey, '../' ) === 0 ||
2041                        strpos( $dbkey, '/./' ) !== false ||
2042                        strpos( $dbkey, '/../' ) !== false  ||
2043                        substr( $dbkey, -2 ) == '/.' ||
2044                        substr( $dbkey, -3 ) == '/..' ) )
2045                 {
2046                         return false;
2047                 }
2048
2049                 /**
2050                  * Magic tilde sequences? Nu-uh!
2051                  */
2052                 if( strpos( $dbkey, '~~~' ) !== false ) {
2053                         return false;
2054                 }
2055
2056                 /**
2057                  * Limit the size of titles to 255 bytes.
2058                  * This is typically the size of the underlying database field.
2059                  * We make an exception for special pages, which don't need to be stored
2060                  * in the database, and may edge over 255 bytes due to subpage syntax
2061                  * for long titles, e.g. [[Special:Block/Long name]]
2062                  */
2063                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2064                   strlen( $dbkey ) > 512 )
2065                 {
2066                         return false;
2067                 }
2068
2069                 /**
2070                  * Normally, all wiki links are forced to have
2071                  * an initial capital letter so [[foo]] and [[Foo]]
2072                  * point to the same place.
2073                  *
2074                  * Don't force it for interwikis, since the other
2075                  * site might be case-sensitive.
2076                  */
2077                 $this->mUserCaseDBKey = $dbkey;
2078                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2079                         $dbkey = $wgContLang->ucfirst( $dbkey );
2080                 }
2081
2082                 /**
2083                  * Can't make a link to a namespace alone...
2084                  * "empty" local links can only be self-links
2085                  * with a fragment identifier.
2086                  */
2087                 if( $dbkey == '' &&
2088                         $this->mInterwiki == '' &&
2089                         $this->mNamespace != NS_MAIN ) {
2090                         return false;
2091                 }
2092                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2093                 // IP names are not allowed for accounts, and can only be referring to
2094                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2095                 // there are numerous ways to present the same IP. Having sp:contribs scan
2096                 // them all is silly and having some show the edits and others not is
2097                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2098                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2099                         IP::sanitizeIP( $dbkey ) : $dbkey;
2100                 // Any remaining initial :s are illegal.
2101                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2102                         return false;
2103                 }
2104
2105                 # Fill fields
2106                 $this->mDbkeyform = $dbkey;
2107                 $this->mUrlform = wfUrlencode( $dbkey );
2108
2109                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2110
2111                 return true;
2112         }
2113
2114         /**
2115          * Set the fragment for this title
2116          * This is kind of bad, since except for this rarely-used function, Title objects
2117          * are immutable. The reason this is here is because it's better than setting the
2118          * members directly, which is what Linker::formatComment was doing previously.
2119          *
2120          * @param string $fragment text
2121          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2122          */
2123         public function setFragment( $fragment ) {
2124                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2125         }
2126
2127         /**
2128          * Get a Title object associated with the talk page of this article
2129          * @return Title the object for the talk page
2130          */
2131         public function getTalkPage() {
2132                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2133         }
2134
2135         /**
2136          * Get a title object associated with the subject page of this
2137          * talk page
2138          *
2139          * @return Title the object for the subject page
2140          */
2141         public function getSubjectPage() {
2142                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2143         }
2144
2145         /**
2146          * Get an array of Title objects linking to this Title
2147          * Also stores the IDs in the link cache.
2148          *
2149          * WARNING: do not use this function on arbitrary user-supplied titles!
2150          * On heavily-used templates it will max out the memory.
2151          *
2152          * @param string $options may be FOR UPDATE
2153          * @return array the Title objects linking here
2154          */
2155         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2156                 $linkCache =& LinkCache::singleton();
2157
2158                 if ( $options ) {
2159                         $db = wfGetDB( DB_MASTER );
2160                 } else {
2161                         $db = wfGetDB( DB_SLAVE );
2162                 }
2163
2164                 $res = $db->select( array( 'page', $table ),
2165                         array( 'page_namespace', 'page_title', 'page_id' ),
2166                         array(
2167                                 "{$prefix}_from=page_id",
2168                                 "{$prefix}_namespace" => $this->getNamespace(),
2169                                 "{$prefix}_title"     => $this->getDBkey() ),
2170                         'Title::getLinksTo',
2171                         $options );
2172
2173                 $retVal = array();
2174                 if ( $db->numRows( $res ) ) {
2175                         while ( $row = $db->fetchObject( $res ) ) {
2176                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2177                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
2178                                         $retVal[] = $titleObj;
2179                                 }
2180                         }
2181                 }
2182                 $db->freeResult( $res );
2183                 return $retVal;
2184         }
2185
2186         /**
2187          * Get an array of Title objects using this Title as a template
2188          * Also stores the IDs in the link cache.
2189          *
2190          * WARNING: do not use this function on arbitrary user-supplied titles!
2191          * On heavily-used templates it will max out the memory.
2192          *
2193          * @param string $options may be FOR UPDATE
2194          * @return array the Title objects linking here
2195          */
2196         public function getTemplateLinksTo( $options = '' ) {
2197                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2198         }
2199
2200         /**
2201          * Get an array of Title objects referring to non-existent articles linked from this page
2202          *
2203          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2204          * @param string $options may be FOR UPDATE
2205          * @return array the Title objects
2206          */
2207         public function getBrokenLinksFrom( $options = '' ) {
2208                 if ( $this->getArticleId() == 0 ) {
2209                         # All links from article ID 0 are false positives
2210                         return array();
2211                 }
2212
2213                 if ( $options ) {
2214                         $db = wfGetDB( DB_MASTER );
2215                 } else {
2216                         $db = wfGetDB( DB_SLAVE );
2217                 }
2218
2219                 $res = $db->safeQuery(
2220                           "SELECT pl_namespace, pl_title
2221                              FROM !
2222                         LEFT JOIN !
2223                                ON pl_namespace=page_namespace
2224                               AND pl_title=page_title
2225                             WHERE pl_from=?
2226                               AND page_namespace IS NULL
2227                                   !",
2228                         $db->tableName( 'pagelinks' ),
2229                         $db->tableName( 'page' ),
2230                         $this->getArticleId(),
2231                         $options );
2232
2233                 $retVal = array();
2234                 if ( $db->numRows( $res ) ) {
2235                         while ( $row = $db->fetchObject( $res ) ) {
2236                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2237                         }
2238                 }
2239                 $db->freeResult( $res );
2240                 return $retVal;
2241         }
2242
2243
2244         /**
2245          * Get a list of URLs to purge from the Squid cache when this
2246          * page changes
2247          *
2248          * @return array the URLs
2249          */
2250         public function getSquidURLs() {
2251                 global $wgContLang;
2252
2253                 $urls = array(
2254                         $this->getInternalURL(),
2255                         $this->getInternalURL( 'action=history' )
2256                 );
2257
2258                 // purge variant urls as well
2259                 if($wgContLang->hasVariants()){
2260                         $variants = $wgContLang->getVariants();
2261                         foreach($variants as $vCode){
2262                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2263                                 $urls[] = $this->getInternalURL('',$vCode);
2264                         }
2265                 }
2266
2267                 return $urls;
2268         }
2269
2270         public function purgeSquid() {
2271                 global $wgUseSquid;
2272                 if ( $wgUseSquid ) {
2273                         $urls = $this->getSquidURLs();
2274                         $u = new SquidUpdate( $urls );
2275                         $u->doUpdate();
2276                 }
2277         }
2278
2279         /**
2280          * Move this page without authentication
2281          * @param Title &$nt the new page Title
2282          */
2283         public function moveNoAuth( &$nt ) {
2284                 return $this->moveTo( $nt, false );
2285         }
2286
2287         /**
2288          * Check whether a given move operation would be valid.
2289          * Returns true if ok, or a message key string for an error message
2290          * if invalid. (Scarrrrry ugly interface this.)
2291          * @param Title &$nt the new title
2292          * @param bool $auth indicates whether $wgUser's permissions
2293          *      should be checked
2294          * @return mixed true on success, message name on failure
2295          */
2296         public function isValidMoveOperation( &$nt, $auth = true ) {
2297                 if( !$this or !$nt ) {
2298                         return 'badtitletext';
2299                 }
2300                 if( $this->equals( $nt ) ) {
2301                         return 'selfmove';
2302                 }
2303                 if( !$this->isMovable() || !$nt->isMovable() ) {
2304                         return 'immobile_namespace';
2305                 }
2306
2307                 $oldid = $this->getArticleID();
2308                 $newid = $nt->getArticleID();
2309
2310                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2311                         return 'articleexists';
2312                 }
2313                 if ( ( '' == $this->getDBkey() ) ||
2314                          ( !$oldid ) ||
2315                      ( '' == $nt->getDBkey() ) ) {
2316                         return 'badarticleerror';
2317                 }
2318
2319                 if ( $auth ) {
2320                         global $wgUser;
2321                         $errors = array_merge($this->getUserPermissionsErrors('move', $wgUser),
2322                                         $this->getUserPermissionsErrors('edit', $wgUser),
2323                                         $nt->getUserPermissionsErrors('move', $wgUser),
2324                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2325                         if($errors !== array())
2326                                 return $errors[0][0];
2327                 }
2328
2329                 global $wgUser;
2330                 $err = null;
2331                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2332                         return 'hookaborted';
2333                 }
2334
2335                 # The move is allowed only if (1) the target doesn't exist, or
2336                 # (2) the target is a redirect to the source, and has no history
2337                 # (so we can undo bad moves right after they're done).
2338
2339                 if ( 0 != $newid ) { # Target exists; check for validity
2340                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2341                                 return 'articleexists';
2342                         }
2343                 } else {
2344                         $tp = $nt->getTitleProtection();
2345                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2346                                 return 'cantmove-titleprotected';
2347                         }
2348                 }
2349                 return true;
2350         }
2351
2352         /**
2353          * Move a title to a new location
2354          * @param Title &$nt the new title
2355          * @param bool $auth indicates whether $wgUser's permissions
2356          *      should be checked
2357          * @param string $reason The reason for the move
2358          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2359          *  Ignored if the user doesn't have the suppressredirect right.
2360          * @return mixed true on success, message name on failure
2361          */
2362         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2363                 $err = $this->isValidMoveOperation( $nt, $auth );
2364                 if( is_string( $err ) ) {
2365                         return $err;
2366                 }
2367
2368                 $pageid = $this->getArticleID();
2369                 if( $nt->exists() ) {
2370                         $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2371                         $pageCountChange = ($createRedirect ? 0 : -1);
2372                 } else { # Target didn't exist, do normal move.
2373                         $this->moveToNewTitle( $nt, $reason, $createRedirect );
2374                         $pageCountChange = ($createRedirect ? 1 : 0);
2375                 }
2376                 $redirid = $this->getArticleID();
2377
2378                 // Category memberships include a sort key which may be customized.
2379                 // If it's left as the default (the page title), we need to update
2380                 // the sort key to match the new title.
2381                 //
2382                 // Be careful to avoid resetting cl_timestamp, which may disturb
2383                 // time-based lists on some sites.
2384                 //
2385                 // Warning -- if the sort key is *explicitly* set to the old title,
2386                 // we can't actually distinguish it from a default here, and it'll
2387                 // be set to the new title even though it really shouldn't.
2388                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2389                 $dbw = wfGetDB( DB_MASTER );
2390                 $dbw->update( 'categorylinks',
2391                         array(
2392                                 'cl_sortkey' => $nt->getPrefixedText(),
2393                                 'cl_timestamp=cl_timestamp' ),
2394                         array(
2395                                 'cl_from' => $pageid,
2396                                 'cl_sortkey' => $this->getPrefixedText() ),
2397                         __METHOD__ );
2398
2399                 # Update watchlists
2400
2401                 $oldnamespace = $this->getNamespace() & ~1;
2402                 $newnamespace = $nt->getNamespace() & ~1;
2403                 $oldtitle = $this->getDBkey();
2404                 $newtitle = $nt->getDBkey();
2405
2406                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2407                         WatchedItem::duplicateEntries( $this, $nt );
2408                 }
2409
2410                 # Update search engine
2411                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2412                 $u->doUpdate();
2413                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2414                 $u->doUpdate();
2415
2416                 # Update site_stats
2417                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2418                         # No longer a content page
2419                         # Not viewed, edited, removing
2420                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2421                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2422                         # Now a content page
2423                         # Not viewed, edited, adding
2424                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2425                 } elseif( $pageCountChange ) {
2426                         # Redirect added
2427                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2428                 } else {
2429                         # Nothing special
2430                         $u = false;
2431                 }
2432                 if( $u )
2433                         $u->doUpdate();
2434                 # Update message cache for interface messages
2435                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2436                         global $wgMessageCache;
2437                         $oldarticle = new Article( $this );
2438                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2439                         $newarticle = new Article( $nt );
2440                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2441                 }
2442
2443                 global $wgUser;
2444                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2445                 return true;
2446         }
2447
2448         /**
2449          * Move page to a title which is at present a redirect to the
2450          * source page
2451          *
2452          * @param Title &$nt the page to move to, which should currently
2453          *      be a redirect
2454          * @param string $reason The reason for the move
2455          * @param bool $createRedirect Whether to leave a redirect at the old title.
2456          *  Ignored if the user doesn't have the suppressredirect right
2457          */
2458         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2459                 global $wgUseSquid, $wgUser;
2460                 $fname = 'Title::moveOverExistingRedirect';
2461                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2462
2463                 if ( $reason ) {
2464                         $comment .= ": $reason";
2465                 }
2466
2467                 $now = wfTimestampNow();
2468                 $newid = $nt->getArticleID();
2469                 $oldid = $this->getArticleID();
2470                 $dbw = wfGetDB( DB_MASTER );
2471
2472                 # Delete the old redirect. We don't save it to history since
2473                 # by definition if we've got here it's rather uninteresting.
2474                 # We have to remove it so that the next step doesn't trigger
2475                 # a conflict on the unique namespace+title index...
2476                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2477                 if ( !$dbw->cascadingDeletes() ) {
2478                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2479                         global $wgUseTrackbacks;
2480                         if ($wgUseTrackbacks)
2481                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2482                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2483                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2484                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2485                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2486                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2487                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2488                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2489                 }
2490
2491                 # Save a null revision in the page's history notifying of the move
2492                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2493                 $nullRevId = $nullRevision->insertOn( $dbw );
2494
2495                 # Change the name of the target page:
2496                 $dbw->update( 'page',
2497                         /* SET */ array(
2498                                 'page_touched'   => $dbw->timestamp($now),
2499                                 'page_namespace' => $nt->getNamespace(),
2500                                 'page_title'     => $nt->getDBkey(),
2501                                 'page_latest'    => $nullRevId,
2502                         ),
2503                         /* WHERE */ array( 'page_id' => $oldid ),
2504                         $fname
2505                 );
2506                 $nt->resetArticleID( $oldid );
2507
2508                 # Recreate the redirect, this time in the other direction.
2509                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2510                 {
2511                         $mwRedir = MagicWord::get( 'redirect' );
2512                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2513                         $redirectArticle = new Article( $this );
2514                         $newid = $redirectArticle->insertOn( $dbw );
2515                         $redirectRevision = new Revision( array(
2516                                 'page'    => $newid,
2517                                 'comment' => $comment,
2518                                 'text'    => $redirectText ) );
2519                         $redirectRevision->insertOn( $dbw );
2520                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2521
2522                         # Now, we record the link from the redirect to the new title.
2523                         # It should have no other outgoing links...
2524                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2525                         $dbw->insert( 'pagelinks',
2526                                 array(
2527                                         'pl_from'      => $newid,
2528                                         'pl_namespace' => $nt->getNamespace(),
2529                                         'pl_title'     => $nt->getDBkey() ),
2530                                 $fname );
2531                 } else {
2532                         $this->resetArticleID( 0 );
2533                 }
2534
2535                 # Log the move
2536                 $log = new LogPage( 'move' );
2537                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2538
2539                 # Purge squid
2540                 if ( $wgUseSquid ) {
2541                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2542                         $u = new SquidUpdate( $urls );
2543                         $u->doUpdate();
2544                 }
2545         }
2546
2547         /**
2548          * Move page to non-existing title.
2549          * @param Title &$nt the new Title
2550          * @param string $reason The reason for the move
2551          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2552          *  Ignored if the user doesn't have the suppressredirect right
2553          */
2554         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2555                 global $wgUseSquid, $wgUser;
2556                 $fname = 'MovePageForm::moveToNewTitle';
2557                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2558                 if ( $reason ) {
2559                         $comment .= ": $reason";
2560                 }
2561
2562                 $newid = $nt->getArticleID();
2563                 $oldid = $this->getArticleID();
2564                 $dbw = wfGetDB( DB_MASTER );
2565                 $now = $dbw->timestamp();
2566
2567                 # Save a null revision in the page's history notifying of the move
2568                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2569                 $nullRevId = $nullRevision->insertOn( $dbw );
2570
2571                 # Rename page entry
2572                 $dbw->update( 'page',
2573                         /* SET */ array(
2574                                 'page_touched'   => $now,
2575                                 'page_namespace' => $nt->getNamespace(),
2576                                 'page_title'     => $nt->getDBkey(),
2577                                 'page_latest'    => $nullRevId,
2578                         ),
2579                         /* WHERE */ array( 'page_id' => $oldid ),
2580                         $fname
2581                 );
2582                 $nt->resetArticleID( $oldid );
2583
2584                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2585                 {
2586                         # Insert redirect
2587                         $mwRedir = MagicWord::get( 'redirect' );
2588                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2589                         $redirectArticle = new Article( $this );
2590                         $newid = $redirectArticle->insertOn( $dbw );
2591                         $redirectRevision = new Revision( array(
2592                                 'page'    => $newid,
2593                                 'comment' => $comment,
2594                                 'text'    => $redirectText ) );
2595                         $redirectRevision->insertOn( $dbw );
2596                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2597
2598                         # Record the just-created redirect's linking to the page
2599                         $dbw->insert( 'pagelinks',
2600                                 array(
2601                                         'pl_from'      => $newid,
2602                                         'pl_namespace' => $nt->getNamespace(),
2603                                         'pl_title'     => $nt->getDBkey() ),
2604                                 $fname );
2605                 } else {
2606                         $this->resetArticleID( 0 );
2607                 }
2608
2609                 # Log the move
2610                 $log = new LogPage( 'move' );
2611                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2612
2613                 # Purge caches as per article creation
2614                 Article::onArticleCreate( $nt );
2615
2616                 # Purge old title from squid
2617                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2618                 $this->purgeSquid();
2619         }
2620
2621         /**
2622          * Checks if $this can be moved to a given Title
2623          * - Selects for update, so don't call it unless you mean business
2624          *
2625          * @param Title &$nt the new title to check
2626          */
2627         public function isValidMoveTarget( $nt ) {
2628
2629                 $fname = 'Title::isValidMoveTarget';
2630                 $dbw = wfGetDB( DB_MASTER );
2631
2632                 # Is it a redirect?
2633                 $id  = $nt->getArticleID();
2634                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2635                         array( 'page_is_redirect','old_text','old_flags' ),
2636                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2637                         $fname, 'FOR UPDATE' );
2638
2639                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2640                         # Not a redirect
2641                         wfDebug( __METHOD__ . ": not a redirect\n" );
2642                         return false;
2643                 }
2644                 $text = Revision::getRevisionText( $obj );
2645
2646                 # Does the redirect point to the source?
2647                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2648                 $m = array();
2649                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2650                         $redirTitle = Title::newFromText( $m[1] );
2651                         if( !is_object( $redirTitle ) ||
2652                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2653                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2654                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2655                                 return false;
2656                         }
2657                 } else {
2658                         # Fail safe
2659                         wfDebug( __METHOD__ . ": failsafe\n" );
2660                         return false;
2661                 }
2662
2663                 # Does the article have a history?
2664                 $row = $dbw->selectRow( array( 'page', 'revision'),
2665                         array( 'rev_id' ),
2666                         array( 'page_namespace' => $nt->getNamespace(),
2667                                 'page_title' => $nt->getDBkey(),
2668                                 'page_id=rev_page AND page_latest != rev_id'
2669                         ), $fname, 'FOR UPDATE'
2670                 );
2671
2672                 # Return true if there was no history
2673                 return $row === false;
2674         }
2675
2676         /**
2677          * Can this title be added to a user's watchlist?
2678          *
2679          * @return bool
2680          */
2681         public function isWatchable() {
2682                 return !$this->isExternal()
2683                         && Namespace::isWatchable( $this->getNamespace() );
2684         }
2685
2686         /**
2687          * Get categories to which this Title belongs and return an array of
2688          * categories' names.
2689          *
2690          * @return array an array of parents in the form:
2691          *      $parent => $currentarticle
2692          */
2693         public function getParentCategories() {
2694                 global $wgContLang;
2695
2696                 $titlekey = $this->getArticleId();
2697                 $dbr = wfGetDB( DB_SLAVE );
2698                 $categorylinks = $dbr->tableName( 'categorylinks' );
2699
2700                 # NEW SQL
2701                 $sql = "SELECT * FROM $categorylinks"
2702                      ." WHERE cl_from='$titlekey'"
2703                          ." AND cl_from <> '0'"
2704                          ." ORDER BY cl_sortkey";
2705
2706                 $res = $dbr->query ( $sql ) ;
2707
2708                 if($dbr->numRows($res) > 0) {
2709                         while ( $x = $dbr->fetchObject ( $res ) )
2710                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2711                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2712                         $dbr->freeResult ( $res ) ;
2713                 } else {
2714                         $data = array();
2715                 }
2716                 return $data;
2717         }
2718
2719         /**
2720          * Get a tree of parent categories
2721          * @param array $children an array with the children in the keys, to check for circular refs
2722          * @return array
2723          */
2724         public function getParentCategoryTree( $children = array() ) {
2725                 $stack = array();
2726                 $parents = $this->getParentCategories();
2727
2728                 if($parents != '') {
2729                         foreach($parents as $parent => $current) {
2730                                 if ( array_key_exists( $parent, $children ) ) {
2731                                         # Circular reference
2732                                         $stack[$parent] = array();
2733                                 } else {
2734                                         $nt = Title::newFromText($parent);
2735                                         if ( $nt ) {
2736                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2737                                         }
2738                                 }
2739                         }
2740                         return $stack;
2741                 } else {
2742                         return array();
2743                 }
2744         }
2745
2746
2747         /**
2748          * Get an associative array for selecting this title from
2749          * the "page" table
2750          *
2751          * @return array
2752          */
2753         public function pageCond() {
2754                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2755         }
2756
2757         /**
2758          * Get the revision ID of the previous revision
2759          *
2760          * @param integer $revision  Revision ID. Get the revision that was before this one.
2761          * @return integer $oldrevision|false
2762          */
2763         public function getPreviousRevisionID( $revision ) {
2764                 $dbr = wfGetDB( DB_SLAVE );
2765                 return $dbr->selectField( 'revision', 'rev_id',
2766                         'rev_page=' . intval( $this->getArticleId() ) .
2767                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2768         }
2769
2770         /**
2771          * Get the revision ID of the next revision
2772          *
2773          * @param integer $revision  Revision ID. Get the revision that was after this one.
2774          * @return integer $oldrevision|false
2775          */
2776         public function getNextRevisionID( $revision ) {
2777                 $dbr = wfGetDB( DB_SLAVE );
2778                 return $dbr->selectField( 'revision', 'rev_id',
2779                         'rev_page=' . intval( $this->getArticleId() ) .
2780                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2781         }
2782
2783         /**
2784          * Get the number of revisions between the given revision IDs.
2785          *
2786          * @param integer $old  Revision ID.
2787          * @param integer $new  Revision ID.
2788          * @return integer  Number of revisions between these IDs.
2789          */
2790         public function countRevisionsBetween( $old, $new ) {
2791                 $dbr = wfGetDB( DB_SLAVE );
2792                 return $dbr->selectField( 'revision', 'count(*)',
2793                         'rev_page = ' . intval( $this->getArticleId() ) .
2794                         ' AND rev_id > ' . intval( $old ) .
2795                         ' AND rev_id < ' . intval( $new ) );
2796         }
2797
2798         /**
2799          * Compare with another title.
2800          *
2801          * @param Title $title
2802          * @return bool
2803          */
2804         public function equals( $title ) {
2805                 // Note: === is necessary for proper matching of number-like titles.
2806                 return $this->getInterwiki() === $title->getInterwiki()
2807                         && $this->getNamespace() == $title->getNamespace()
2808                         && $this->getDBkey() === $title->getDBkey();
2809         }
2810
2811         /**
2812          * Return a string representation of this title
2813          *
2814          * @return string
2815          */
2816         public function __toString() {
2817                 return $this->getPrefixedText();
2818         }
2819
2820         /**
2821          * Check if page exists
2822          * @return bool
2823          */
2824         public function exists() {
2825                 return $this->getArticleId() != 0;
2826         }
2827
2828         /**
2829          * Do we know that this title definitely exists, or should we otherwise
2830          * consider that it exists?
2831          *
2832          * @return bool
2833          */
2834         public function isAlwaysKnown() {
2835                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2836                 // the full l10n of that language to be loaded. That takes much memory and
2837                 // isn't needed. So we strip the language part away.
2838                 // Also, extension messages which are not loaded, are shown as red, because
2839                 // we don't call MessageCache::loadAllMessages.
2840                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2841                 return $this->isExternal()
2842                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2843                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2844         }
2845
2846         /**
2847          * Update page_touched timestamps and send squid purge messages for
2848          * pages linking to this title. May be sent to the job queue depending
2849          * on the number of links. Typically called on create and delete.
2850          */
2851         public function touchLinks() {
2852                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2853                 $u->doUpdate();
2854
2855                 if ( $this->getNamespace() == NS_CATEGORY ) {
2856                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2857                         $u->doUpdate();
2858                 }
2859         }
2860
2861         /**
2862          * Get the last touched timestamp
2863          */
2864         public function getTouched() {
2865                 $dbr = wfGetDB( DB_SLAVE );
2866                 $touched = $dbr->selectField( 'page', 'page_touched',
2867                         array(
2868                                 'page_namespace' => $this->getNamespace(),
2869                                 'page_title' => $this->getDBkey()
2870                         ), __METHOD__
2871                 );
2872                 return $touched;
2873         }
2874
2875         public function trackbackURL() {
2876                 global $wgTitle, $wgScriptPath, $wgServer;
2877
2878                 return "$wgServer$wgScriptPath/trackback.php?article="
2879                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2880         }
2881
2882         public function trackbackRDF() {
2883                 $url = htmlspecialchars($this->getFullURL());
2884                 $title = htmlspecialchars($this->getText());
2885                 $tburl = $this->trackbackURL();
2886
2887                 return "
2888 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2889          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2890          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2891 <rdf:Description
2892    rdf:about=\"$url\"
2893    dc:identifier=\"$url\"
2894    dc:title=\"$title\"
2895    trackback:ping=\"$tburl\" />
2896 </rdf:RDF>";
2897         }
2898
2899         /**
2900          * Generate strings used for xml 'id' names in monobook tabs
2901          * @return string
2902          */
2903         public function getNamespaceKey() {
2904                 global $wgContLang;
2905                 switch ($this->getNamespace()) {
2906                         case NS_MAIN:
2907                         case NS_TALK:
2908                                 return 'nstab-main';
2909                         case NS_USER:
2910                         case NS_USER_TALK:
2911                                 return 'nstab-user';
2912                         case NS_MEDIA:
2913                                 return 'nstab-media';
2914                         case NS_SPECIAL:
2915                                 return 'nstab-special';
2916                         case NS_PROJECT:
2917                         case NS_PROJECT_TALK:
2918                                 return 'nstab-project';
2919                         case NS_IMAGE:
2920                         case NS_IMAGE_TALK:
2921                                 return 'nstab-image';
2922                         case NS_MEDIAWIKI:
2923                         case NS_MEDIAWIKI_TALK:
2924                                 return 'nstab-mediawiki';
2925                         case NS_TEMPLATE:
2926                         case NS_TEMPLATE_TALK:
2927                                 return 'nstab-template';
2928                         case NS_HELP:
2929                         case NS_HELP_TALK:
2930                                 return 'nstab-help';
2931                         case NS_CATEGORY:
2932                         case NS_CATEGORY_TALK:
2933                                 return 'nstab-category';
2934                         default:
2935                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2936                 }
2937         }
2938
2939         /**
2940          * Returns true if this title resolves to the named special page
2941          * @param string $name The special page name
2942          */
2943         public function isSpecial( $name ) {
2944                 if ( $this->getNamespace() == NS_SPECIAL ) {
2945                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2946                         if ( $name == $thisName ) {
2947                                 return true;
2948                         }
2949                 }
2950                 return false;
2951         }
2952
2953         /**
2954          * If the Title refers to a special page alias which is not the local default,
2955          * returns a new Title which points to the local default. Otherwise, returns $this.
2956          */
2957         public function fixSpecialName() {
2958                 if ( $this->getNamespace() == NS_SPECIAL ) {
2959                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2960                         if ( $canonicalName ) {
2961                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2962                                 if ( $localName != $this->mDbkeyform ) {
2963                                         return Title::makeTitle( NS_SPECIAL, $localName );
2964                                 }
2965                         }
2966                 }
2967                 return $this;
2968         }
2969
2970         /**
2971          * Is this Title in a namespace which contains content?
2972          * In other words, is this a content page, for the purposes of calculating
2973          * statistics, etc?
2974          *
2975          * @return bool
2976          */
2977         public function isContentPage() {
2978                 return Namespace::isContent( $this->getNamespace() );
2979         }
2980
2981 }