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( $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;
 946
 947                 # Special pages have inherent protection
 948                 if( $this->getNamespace() == NS_SPECIAL )
 949                         return true;
 950
 951                 # Check regular protection levels
 952                 if( $action == 'edit' || $action == '' ) {
 953                         $r = $this->getRestrictions( 'edit' );
 954                         foreach( $wgRestrictionLevels as $level ) {
 955                                 if( in_array( $level, $r ) && $level != '' ) {
 956                                         return( true );
 957                                 }
 958                         }
 959                 }
 960
 961                 if( $action == 'move' || $action == '' ) {
 962                         $r = $this->getRestrictions( 'move' );
 963                         foreach( $wgRestrictionLevels as $level ) {
 964                                 if( in_array( $level, $r ) && $level != '' ) {
 965                                         return( true );
 966                                 }
 967                         }
 968                 }
 969
 970                 return false;
 971         }
 972
 973         /**
 974          * Is $wgUser is watching this page?
 975          * @return boolean
 976          */
 977         public function userIsWatching() {
 978                 global $wgUser;
 979
 980                 if ( is_null( $this->mWatched ) ) {
 981                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 982                                 $this->mWatched = false;
 983                         } else {
 984                                 $this->mWatched = $wgUser->isWatched( $this );
 985                         }
 986                 }
 987                 return $this->mWatched;
 988         }
 989
 990         /**
 991          * Can $wgUser perform $action on this page?
 992          * This skips potentially expensive cascading permission checks.
 993          *
 994          * Suitable for use for nonessential UI controls in common cases, but
 995          * _not_ for functional access control.
 996          *
 997          * May provide false positives, but should never provide a false negative.
 998          *
 999          * @param string $action action that permission needs to be checked for
1000          * @return boolean
1001          */
1002         public function quickUserCan( $action ) {
1003                 return $this->userCan( $action, false );
1004         }
1005
1006         /**
1007          * Determines if $wgUser is unable to edit this page because it has been protected
1008          * by $wgNamespaceProtection.
1009          *
1010          * @return boolean
1011          */
1012         public function isNamespaceProtected() {
1013                 global $wgNamespaceProtection, $wgUser;
1014                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1015                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1016                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1017                                         return true;
1018                         }
1019                 }
1020                 return false;
1021         }
1022
1023         /**
1024          * Can $wgUser perform $action on this page?
1025          * @param string $action action that permission needs to be checked for
1026          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1027          * @return boolean
1028          */
1029         public function userCan( $action, $doExpensiveQueries = true ) {
1030                 global $wgUser;
1031                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1032         }
1033
1034         /**
1035          * Can $user perform $action on this page?
1036          *
1037          * FIXME: This *does not* check throttles (User::pingLimiter()).
1038          *
1039          * @param string $action action that permission needs to be checked for
1040          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1041          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1042          */
1043         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1044                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1045
1046                 global $wgContLang;
1047                 global $wgLang;
1048                 global $wgEmailConfirmToEdit, $wgUser;
1049
1050                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1051                         $errors[] = array( 'confirmedittext' );
1052                 }
1053
1054                 if ( $user->isBlockedFrom( $this ) ) {
1055                         $block = $user->mBlock;
1056
1057                         // This is from OutputPage::blockedPage
1058                         // Copied at r23888 by werdna
1059
1060                         $id = $user->blockedBy();
1061                         $reason = $user->blockedFor();
1062                         if( $reason == '' ) {
1063                                 $reason = wfMsg( 'blockednoreason' );
1064                         }
1065                         $ip = wfGetIP();
1066
1067                         if ( is_numeric( $id ) ) {
1068                                 $name = User::whoIs( $id );
1069                         } else {
1070                                 $name = $id;
1071                         }
1072
1073                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1074                         $blockid = $block->mId;
1075                         $blockExpiry = $user->mBlock->mExpiry;
1076                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1077
1078                         if ( $blockExpiry == 'infinity' ) {
1079                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1080                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1081
1082                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1083                                         if ( strpos( $option, ':' ) == false )
1084                                                 continue;
1085
1086                                         list ($show, $value) = explode( ":", $option );
1087
1088                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1089                                                 $blockExpiry = $show;
1090                                                 break;
1091                                         }
1092                                 }
1093                         } else {
1094                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1095                         }
1096
1097                         $intended = $user->mBlock->mAddress;
1098
1099                         $errors[] = array ( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1100                 }
1101
1102                 return $errors;
1103         }
1104
1105         /**
1106          * Can $user perform $action on this page? This is an internal function,
1107          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1108          * checks on wfReadOnly() and blocks)
1109          *
1110          * @param string $action action that permission needs to be checked for
1111          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1112          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1113          */
1114         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1115                 wfProfileIn( __METHOD__ );
1116
1117                 $errors = array();
1118
1119                 // Use getUserPermissionsErrors instead
1120                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1121                         return $result ? array() : array( array( 'badaccess-group0' ) );
1122                 }
1123
1124                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1125                         if ($result != array() && is_array($result) && !is_array($result[0]))
1126                                 $errors[] = $result; # A single array representing an error
1127                         else if (is_array($result) && is_array($result[0]))
1128                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1129                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1130                                 $errors[] = array($result); # A string representing a message-id
1131                         else if ($result === false )
1132                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1133                 }
1134                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1135                         if ($result != array() && is_array($result) && !is_array($result[0]))
1136                                 $errors[] = $result; # A single array representing an error
1137                         else if (is_array($result) && is_array($result[0]))
1138                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1139                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1140                                 $errors[] = array($result); # A string representing a message-id
1141                         else if ($result === false )
1142                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1143                 }
1144
1145                 if( NS_SPECIAL == $this->mNamespace ) {
1146                         $errors[] = array('ns-specialprotected');
1147                 }
1148
1149                 if ( $this->isNamespaceProtected() ) {
1150                         $ns = $this->getNamespace() == NS_MAIN
1151                                 ? wfMsg( 'nstab-main' )
1152                                 : $this->getNsText();
1153                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1154                                 ? array('protectedinterface')
1155                                 : array( 'namespaceprotected',  $ns ) );
1156                 }
1157
1158                 if( $this->mDbkeyform == '_' ) {
1159                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1160                         $errors[] = array('badaccess-group0');
1161                 }
1162
1163                 # protect css/js subpages of user pages
1164                 # XXX: this might be better using restrictions
1165                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1166                 if( $this->isCssJsSubpage()
1167                         && !$user->isAllowed('editusercssjs')
1168                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1169                         $errors[] = array('customcssjsprotected');
1170                 }
1171
1172                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1173                         # We /could/ use the protection level on the source page, but it's fairly ugly
1174                         #  as we have to establish a precedence hierarchy for pages included by multiple
1175                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1176                         #  as they could remove the protection anyway.
1177                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1178                         # Cascading protection depends on more than this page...
1179                         # Several cascading protected pages may include this page...
1180                         # Check each cascading level
1181                         # This is only for protection restrictions, not for all actions
1182                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1183                                 foreach( $restrictions[$action] as $right ) {
1184                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1185                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1186                                                 $pages = '';
1187                                                 foreach( $cascadingSources as $page )
1188                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1189                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1190                                         }
1191                                 }
1192                         }
1193                 }
1194
1195                 foreach( $this->getRestrictions($action) as $right ) {
1196                         // Backwards compatibility, rewrite sysop -> protect
1197                         if ( $right == 'sysop' ) {
1198                                 $right = 'editprotected';
1199                         }
1200                         if( '' != $right && !$user->isAllowed( $right ) ) {
1201                                 $errors[] = array( 'protectedpagetext', $right );
1202                         }
1203                 }
1204
1205                 if ($action == 'protect') {
1206                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1207                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1208                         }
1209                 }
1210
1211                 if ($action == 'create') {
1212                         $title_protection = $this->getTitleProtection();
1213
1214                         if (is_array($title_protection)) {
1215                                 extract($title_protection);
1216
1217                                 if ($pt_create_perm == 'sysop')
1218                                         $pt_create_perm = 'protect';
1219
1220                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1221                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1222                                 }
1223                         }
1224
1225                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1226                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1227                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1228                         }
1229                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1230                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1231                 } elseif ( !$user->isAllowed( $action ) ) {
1232                         $return = null;
1233                         $groups = array();
1234                         global $wgGroupPermissions;
1235                         foreach( $wgGroupPermissions as $key => $value ) {
1236                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1237                                         $groupName = User::getGroupName( $key );
1238                                         $groupPage = User::getGroupPage( $key );
1239                                         if( $groupPage ) {
1240                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1241                                         } else {
1242                                                 $groups[] = $groupName;
1243                                         }
1244                                 }
1245                         }
1246                         $n = count( $groups );
1247                         $groups = implode( ', ', $groups );
1248                         switch( $n ) {
1249                                 case 0:
1250                                 case 1:
1251                                 case 2:
1252                                         $return = array( "badaccess-group$n", $groups );
1253                                         break;
1254                                 default:
1255                                         $return = array( 'badaccess-groups', $groups );
1256                         }
1257                         $errors[] = $return;
1258                 }
1259
1260                 wfProfileOut( __METHOD__ );
1261                 return $errors;
1262         }
1263
1264         /**
1265          * Is this title subject to title protection?
1266          * @return mixed An associative array representing any existent title
1267          *   protection, or false if there's none.
1268          */
1269         private function getTitleProtection() {
1270                 // Can't protect pages in special namespaces
1271                 if ( $this->getNamespace() < 0 ) {
1272                         return false;
1273                 }
1274
1275                 $dbr = wfGetDB( DB_SLAVE );
1276                 $res = $dbr->select( 'protected_titles', '*',
1277                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1278
1279                 if ($row = $dbr->fetchRow( $res )) {
1280                         return $row;
1281                 } else {
1282                         return false;
1283                 }
1284         }
1285
1286         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1287                 global $wgGroupPermissions,$wgUser,$wgContLang;
1288
1289                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1290                         && $expiry == $this->mRestrictionsExpiry) {
1291                         // No change
1292                         return true;
1293                 }
1294
1295                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1296
1297                 $dbw = wfGetDB( DB_MASTER );
1298
1299                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1300
1301                 $expiry_description = '';
1302                 if ( $encodedExpiry != 'infinity' ) {
1303                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1304                 }
1305
1306                 # Update protection table
1307                 if ($create_perm != '' ) {
1308                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1309                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1310                                         , 'pt_create_perm' => $create_perm
1311                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1312                                         , 'pt_expiry' => $encodedExpiry
1313                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1314                 } else {
1315                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1316                                 'pt_title' => $title ), __METHOD__ );
1317                 }
1318                 # Update the protection log
1319                 $log = new LogPage( 'protect' );
1320
1321                 if( $create_perm ) {
1322                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1323                 } else {
1324                         $log->addEntry( 'unprotect', $this, $reason );
1325                 }
1326
1327                 return true;
1328         }
1329
1330         /**
1331          * Remove any title protection (due to page existing
1332          */
1333         public function deleteTitleProtection() {
1334                 $dbw = wfGetDB( DB_MASTER );
1335
1336                 $dbw->delete( 'protected_titles',
1337                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1338         }
1339
1340         /**
1341          * Can $wgUser edit this page?
1342          * @return boolean
1343          * @deprecated use userCan('edit')
1344          */
1345         public function userCanEdit( $doExpensiveQueries = true ) {
1346                 return $this->userCan( 'edit', $doExpensiveQueries );
1347         }
1348
1349         /**
1350          * Can $wgUser create this page?
1351          * @return boolean
1352          * @deprecated use userCan('create')
1353          */
1354         public function userCanCreate( $doExpensiveQueries = true ) {
1355                 return $this->userCan( 'create', $doExpensiveQueries );
1356         }
1357
1358         /**
1359          * Can $wgUser move this page?
1360          * @return boolean
1361          * @deprecated use userCan('move')
1362          */
1363         public function userCanMove( $doExpensiveQueries = true ) {
1364                 return $this->userCan( 'move', $doExpensiveQueries );
1365         }
1366
1367         /**
1368          * Would anybody with sufficient privileges be able to move this page?
1369          * Some pages just aren't movable.
1370          *
1371          * @return boolean
1372          */
1373         public function isMovable() {
1374                 return Namespace::isMovable( $this->getNamespace() )
1375                         && $this->getInterwiki() == '';
1376         }
1377
1378         /**
1379          * Can $wgUser read this page?
1380          * @return boolean
1381          * @todo fold these checks into userCan()
1382          */
1383         public function userCanRead() {
1384                 global $wgUser, $wgGroupPermissions;
1385
1386                 # Shortcut for public wikis, allows skipping quite a bit of code path
1387                 if ($wgGroupPermissions['*']['read'])
1388                         return true;
1389
1390                 $result = null;
1391                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1392                 if ( $result !== null ) {
1393                         return $result;
1394                 }
1395
1396                 if( $wgUser->isAllowed( 'read' ) ) {
1397                         return true;
1398                 } else {
1399                         global $wgWhitelistRead;
1400
1401                         /**
1402                          * Always grant access to the login page.
1403                          * Even anons need to be able to log in.
1404                         */
1405                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1406                                 return true;
1407                         }
1408
1409                         /**
1410                          * Bail out if there isn't whitelist
1411                          */
1412                         if( !is_array($wgWhitelistRead) ) {
1413                                 return false;
1414                         }
1415
1416                         /**
1417                          * Check for explicit whitelisting
1418                          */
1419                         $name = $this->getPrefixedText();
1420                         if( in_array( $name, $wgWhitelistRead, true ) )
1421                                 return true;
1422
1423                         /**
1424                          * Old settings might have the title prefixed with
1425                          * a colon for main-namespace pages
1426                          */
1427                         if( $this->getNamespace() == NS_MAIN ) {
1428                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1429                                         return true;
1430                         }
1431
1432                         /**
1433                          * If it's a special page, ditch the subpage bit
1434                          * and check again
1435                          */
1436                         if( $this->getNamespace() == NS_SPECIAL ) {
1437                                 $name = $this->getDBkey();
1438                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1439                                 if ( $name === false ) {
1440                                         # Invalid special page, but we show standard login required message
1441                                         return false;
1442                                 }
1443
1444                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1445                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1446                                         return true;
1447                         }
1448
1449                 }
1450                 return false;
1451         }
1452
1453         /**
1454          * Is this a talk page of some sort?
1455          * @return bool
1456          */
1457         public function isTalkPage() {
1458                 return Namespace::isTalk( $this->getNamespace() );
1459         }
1460
1461         /**
1462          * Is this a subpage?
1463          * @return bool
1464          */
1465         public function isSubpage() {
1466                 global $wgNamespacesWithSubpages;
1467
1468                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1469                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1470                 } else {
1471                         return false;
1472                 }
1473         }
1474
1475         /**
1476          * Could this page contain custom CSS or JavaScript, based
1477          * on the title?
1478          *
1479          * @return bool
1480          */
1481         public function isCssOrJsPage() {
1482                 return $this->mNamespace == NS_MEDIAWIKI
1483                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1484         }
1485
1486         /**
1487          * Is this a .css or .js subpage of a user page?
1488          * @return bool
1489          */
1490         public function isCssJsSubpage() {
1491                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1492         }
1493         /**
1494          * Is this a *valid* .css or .js subpage of a user page?
1495          * Check that the corresponding skin exists
1496          */
1497         public function isValidCssJsSubpage() {
1498                 if ( $this->isCssJsSubpage() ) {
1499                         $skinNames = Skin::getSkinNames();
1500                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1501                 } else {
1502                         return false;
1503                 }
1504         }
1505         /**
1506          * Trim down a .css or .js subpage title to get the corresponding skin name
1507          */
1508         public function getSkinFromCssJsSubpage() {
1509                 $subpage = explode( '/', $this->mTextform );
1510                 $subpage = $subpage[ count( $subpage ) - 1 ];
1511                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1512         }
1513         /**
1514          * Is this a .css subpage of a user page?
1515          * @return bool
1516          */
1517         public function isCssSubpage() {
1518                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1519         }
1520         /**
1521          * Is this a .js subpage of a user page?
1522          * @return bool
1523          */
1524         public function isJsSubpage() {
1525                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1526         }
1527         /**
1528          * Protect css/js subpages of user pages: can $wgUser edit
1529          * this page?
1530          *
1531          * @return boolean
1532          * @todo XXX: this might be better using restrictions
1533          */
1534         public function userCanEditCssJsSubpage() {
1535                 global $wgUser;
1536                 return ( $wgUser->isAllowed('editusercssjs') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1537         }
1538
1539         /**
1540          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1541          *
1542          * @return bool If the page is subject to cascading restrictions.
1543          */
1544         public function isCascadeProtected() {
1545                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1546                 return ( $sources > 0 );
1547         }
1548
1549         /**
1550          * Cascading protection: Get the source of any cascading restrictions on this page.
1551          *
1552          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1553          * @return array( mixed title array, restriction array)
1554          * 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.
1555          * The restriction array is an array of each type, each of which contains an array of unique groups
1556          */
1557         public function getCascadeProtectionSources( $get_pages = true ) {
1558                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1559
1560                 # Define our dimension of restrictions types
1561                 $pagerestrictions = array();
1562                 foreach( $wgRestrictionTypes as $action )
1563                         $pagerestrictions[$action] = array();
1564
1565                 if (!$wgEnableCascadingProtection)
1566                         return array( false, $pagerestrictions );
1567
1568                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1569                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1570                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1571                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1572                 }
1573
1574                 wfProfileIn( __METHOD__ );
1575
1576                 $dbr = wfGetDb( DB_SLAVE );
1577
1578                 if ( $this->getNamespace() == NS_IMAGE ) {
1579                         $tables = array ('imagelinks', 'page_restrictions');
1580                         $where_clauses = array(
1581                                 'il_to' => $this->getDBkey(),
1582                                 'il_from=pr_page',
1583                                 'pr_cascade' => 1 );
1584                 } else {
1585                         $tables = array ('templatelinks', 'page_restrictions');
1586                         $where_clauses = array(
1587                                 'tl_namespace' => $this->getNamespace(),
1588                                 'tl_title' => $this->getDBkey(),
1589                                 'tl_from=pr_page',
1590                                 'pr_cascade' => 1 );
1591                 }
1592
1593                 if ( $get_pages ) {
1594                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1595                         $where_clauses[] = 'page_id=pr_page';
1596                         $tables[] = 'page';
1597                 } else {
1598                         $cols = array( 'pr_expiry' );
1599                 }
1600
1601                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1602
1603                 $sources = $get_pages ? array() : false;
1604                 $now = wfTimestampNow();
1605                 $purgeExpired = false;
1606
1607                 while( $row = $dbr->fetchObject( $res ) ) {
1608                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1609                         if( $expiry > $now ) {
1610                                 if ($get_pages) {
1611                                         $page_id = $row->pr_page;
1612                                         $page_ns = $row->page_namespace;
1613                                         $page_title = $row->page_title;
1614                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1615                                         # Add groups needed for each restriction type if its not already there
1616                                         # Make sure this restriction type still exists
1617                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1618                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1619                                         }
1620                                 } else {
1621                                         $sources = true;
1622                                 }
1623                         } else {
1624                                 // Trigger lazy purge of expired restrictions from the db
1625                                 $purgeExpired = true;
1626                         }
1627                 }
1628                 if( $purgeExpired ) {
1629                         Title::purgeExpiredRestrictions();
1630                 }
1631
1632                 wfProfileOut( __METHOD__ );
1633
1634                 if ( $get_pages ) {
1635                         $this->mCascadeSources = $sources;
1636                         $this->mCascadingRestrictions = $pagerestrictions;
1637                 } else {
1638                         $this->mHasCascadingRestrictions = $sources;
1639                 }
1640
1641                 return array( $sources, $pagerestrictions );
1642         }
1643
1644         function areRestrictionsCascading() {
1645                 if (!$this->mRestrictionsLoaded) {
1646                         $this->loadRestrictions();
1647                 }
1648
1649                 return $this->mCascadeRestriction;
1650         }
1651
1652         /**
1653          * Loads a string into mRestrictions array
1654          * @param resource $res restrictions as an SQL result.
1655          */
1656         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1657                 $dbr = wfGetDb( DB_SLAVE );
1658
1659                 $this->mRestrictions['edit'] = array();
1660                 $this->mRestrictions['move'] = array();
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                         $this->mCascadeRestriction = false;
1683                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1684
1685                 }
1686
1687                 if( $dbr->numRows( $res ) ) {
1688                         # Current system - load second to make them override.
1689                         $now = wfTimestampNow();
1690                         $purgeExpired = false;
1691
1692                         while ($row = $dbr->fetchObject( $res ) ) {
1693                                 # Cycle through all the restrictions.
1694
1695                                 // This code should be refactored, now that it's being used more generally,
1696                                 // But I don't really see any harm in leaving it in Block for now -werdna
1697                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1698
1699                                 // Only apply the restrictions if they haven't expired!
1700                                 if ( !$expiry || $expiry > $now ) {
1701                                         $this->mRestrictionsExpiry = $expiry;
1702                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1703
1704                                         $this->mCascadeRestriction |= $row->pr_cascade;
1705                                 } else {
1706                                         // Trigger a lazy purge of expired restrictions
1707                                         $purgeExpired = true;
1708                                 }
1709                         }
1710
1711                         if( $purgeExpired ) {
1712                                 Title::purgeExpiredRestrictions();
1713                         }
1714                 }
1715
1716                 $this->mRestrictionsLoaded = true;
1717         }
1718
1719         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1720                 if( !$this->mRestrictionsLoaded ) {
1721                         if ($this->exists()) {
1722                                 $dbr = wfGetDB( DB_SLAVE );
1723
1724                                 $res = $dbr->select( 'page_restrictions', '*',
1725                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1726
1727                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1728                         } else {
1729                                 $title_protection = $this->getTitleProtection();
1730
1731                                 if (is_array($title_protection)) {
1732                                         extract($title_protection);
1733
1734                                         $now = wfTimestampNow();
1735                                         $expiry = Block::decodeExpiry($pt_expiry);
1736
1737                                         if (!$expiry || $expiry > $now) {
1738                                                 // Apply the restrictions
1739                                                 $this->mRestrictionsExpiry = $expiry;
1740                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1741                                         } else { // Get rid of the old restrictions
1742                                                 Title::purgeExpiredRestrictions();
1743                                         }
1744                                 }
1745                                 $this->mRestrictionsLoaded = true;
1746                         }
1747                 }
1748         }
1749
1750         /**
1751          * Purge expired restrictions from the page_restrictions table
1752          */
1753         static function purgeExpiredRestrictions() {
1754                 $dbw = wfGetDB( DB_MASTER );
1755                 $dbw->delete( 'page_restrictions',
1756                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1757                         __METHOD__ );
1758
1759                 $dbw->delete( 'protected_titles',
1760                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1761                         __METHOD__ );
1762         }
1763
1764         /**
1765          * Accessor/initialisation for mRestrictions
1766          *
1767          * @param string $action action that permission needs to be checked for
1768          * @return array the array of groups allowed to edit this article
1769          */
1770         public function getRestrictions( $action ) {
1771                 if( !$this->mRestrictionsLoaded ) {
1772                         $this->loadRestrictions();
1773                 }
1774                 return isset( $this->mRestrictions[$action] )
1775                                 ? $this->mRestrictions[$action]
1776                                 : array();
1777         }
1778
1779         /**
1780          * Is there a version of this page in the deletion archive?
1781          * @return int the number of archived revisions
1782          */
1783         public function isDeleted() {
1784                 $fname = 'Title::isDeleted';
1785                 if ( $this->getNamespace() < 0 ) {
1786                         $n = 0;
1787                 } else {
1788                         $dbr = wfGetDB( DB_SLAVE );
1789                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1790                                 'ar_title' => $this->getDBkey() ), $fname );
1791                         if( $this->getNamespace() == NS_IMAGE ) {
1792                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1793                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1794                         }
1795                 }
1796                 return (int)$n;
1797         }
1798
1799         /**
1800          * Get the article ID for this Title from the link cache,
1801          * adding it if necessary
1802          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1803          *      for update
1804          * @return int the ID
1805          */
1806         public function getArticleID( $flags = 0 ) {
1807                 $linkCache =& LinkCache::singleton();
1808                 if ( $flags & GAID_FOR_UPDATE ) {
1809                         $oldUpdate = $linkCache->forUpdate( true );
1810                         $this->mArticleID = $linkCache->addLinkObj( $this );
1811                         $linkCache->forUpdate( $oldUpdate );
1812                 } else {
1813                         if ( -1 == $this->mArticleID ) {
1814                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1815                         }
1816                 }
1817                 return $this->mArticleID;
1818         }
1819
1820         public function getLatestRevID() {
1821                 if ($this->mLatestID !== false)
1822                         return $this->mLatestID;
1823
1824                 $db = wfGetDB(DB_SLAVE);
1825                 return $this->mLatestID = $db->selectField( 'revision',
1826                         "max(rev_id)",
1827                         array('rev_page' => $this->getArticleID()),
1828                         'Title::getLatestRevID' );
1829         }
1830
1831         /**
1832          * This clears some fields in this object, and clears any associated
1833          * keys in the "bad links" section of the link cache.
1834          *
1835          * - This is called from Article::insertNewArticle() to allow
1836          * loading of the new page_id. It's also called from
1837          * Article::doDeleteArticle()
1838          *
1839          * @param int $newid the new Article ID
1840          */
1841         public function resetArticleID( $newid ) {
1842                 $linkCache =& LinkCache::singleton();
1843                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1844
1845                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1846                 else { $this->mArticleID = $newid; }
1847                 $this->mRestrictionsLoaded = false;
1848                 $this->mRestrictions = array();
1849         }
1850
1851         /**
1852          * Updates page_touched for this page; called from LinksUpdate.php
1853          * @return bool true if the update succeded
1854          */
1855         public function invalidateCache() {
1856                 global $wgUseFileCache;
1857
1858                 if ( wfReadOnly() ) {
1859                         return;
1860                 }
1861
1862                 $dbw = wfGetDB( DB_MASTER );
1863                 $success = $dbw->update( 'page',
1864                         array( /* SET */
1865                                 'page_touched' => $dbw->timestamp()
1866                         ), array( /* WHERE */
1867                                 'page_namespace' => $this->getNamespace() ,
1868                                 'page_title' => $this->getDBkey()
1869                         ), 'Title::invalidateCache'
1870                 );
1871
1872                 if ($wgUseFileCache) {
1873                         $cache = new HTMLFileCache($this);
1874                         @unlink($cache->fileCacheName());
1875                 }
1876
1877                 return $success;
1878         }
1879
1880         /**
1881          * Prefix some arbitrary text with the namespace or interwiki prefix
1882          * of this object
1883          *
1884          * @param string $name the text
1885          * @return string the prefixed text
1886          * @private
1887          */
1888         /* private */ function prefix( $name ) {
1889                 $p = '';
1890                 if ( '' != $this->mInterwiki ) {
1891                         $p = $this->mInterwiki . ':';
1892                 }
1893                 if ( 0 != $this->mNamespace ) {
1894                         $p .= $this->getNsText() . ':';
1895                 }
1896                 return $p . $name;
1897         }
1898
1899         /**
1900          * Secure and split - main initialisation function for this object
1901          *
1902          * Assumes that mDbkeyform has been set, and is urldecoded
1903          * and uses underscores, but not otherwise munged.  This function
1904          * removes illegal characters, splits off the interwiki and
1905          * namespace prefixes, sets the other forms, and canonicalizes
1906          * everything.
1907          * @return bool true on success
1908          */
1909         private function secureAndSplit() {
1910                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1911
1912                 # Initialisation
1913                 static $rxTc = false;
1914                 if( !$rxTc ) {
1915                         # Matching titles will be held as illegal.
1916                         $rxTc = '/' .
1917                                 # Any character not allowed is forbidden...
1918                                 '[^' . Title::legalChars() . ']' .
1919                                 # URL percent encoding sequences interfere with the ability
1920                                 # to round-trip titles -- you can't link to them consistently.
1921                                 '|%[0-9A-Fa-f]{2}' .
1922                                 # XML/HTML character references produce similar issues.
1923                                 '|&[A-Za-z0-9\x80-\xff]+;' .
1924                                 '|&#[0-9]+;' .
1925                                 '|&#x[0-9A-Fa-f]+;' .
1926                                 '/S';
1927                 }
1928
1929                 $this->mInterwiki = $this->mFragment = '';
1930                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1931
1932                 $dbkey = $this->mDbkeyform;
1933
1934                 # Strip Unicode bidi override characters.
1935                 # Sometimes they slip into cut-n-pasted page titles, where the
1936                 # override chars get included in list displays.
1937                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1938                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1939
1940                 # Clean up whitespace
1941                 #
1942                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1943                 $dbkey = trim( $dbkey, '_' );
1944
1945                 if ( '' == $dbkey ) {
1946                         return false;
1947                 }
1948
1949                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1950                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1951                         return false;
1952                 }
1953
1954                 $this->mDbkeyform = $dbkey;
1955
1956                 # Initial colon indicates main namespace rather than specified default
1957                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1958                 if ( ':' == $dbkey{0} ) {
1959                         $this->mNamespace = NS_MAIN;
1960                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1961                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
1962                 }
1963
1964                 # Namespace or interwiki prefix
1965                 $firstPass = true;
1966                 do {
1967                         $m = array();
1968                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1969                                 $p = $m[1];
1970                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
1971                                         # Ordinary namespace
1972                                         $dbkey = $m[2];
1973                                         $this->mNamespace = $ns;
1974                                 } elseif( $this->getInterwikiLink( $p ) ) {
1975                                         if( !$firstPass ) {
1976                                                 # Can't make a local interwiki link to an interwiki link.
1977                                                 # That's just crazy!
1978                                                 return false;
1979                                         }
1980
1981                                         # Interwiki link
1982                                         $dbkey = $m[2];
1983                                         $this->mInterwiki = $wgContLang->lc( $p );
1984
1985                                         # Redundant interwiki prefix to the local wiki
1986                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1987                                                 if( $dbkey == '' ) {
1988                                                         # Can't have an empty self-link
1989                                                         return false;
1990                                                 }
1991                                                 $this->mInterwiki = '';
1992                                                 $firstPass = false;
1993                                                 # Do another namespace split...
1994                                                 continue;
1995                                         }
1996
1997                                         # If there's an initial colon after the interwiki, that also
1998                                         # resets the default namespace
1999                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2000                                                 $this->mNamespace = NS_MAIN;
2001                                                 $dbkey = substr( $dbkey, 1 );
2002                                         }
2003                                 }
2004                                 # If there's no recognized interwiki or namespace,
2005                                 # then let the colon expression be part of the title.
2006                         }
2007                         break;
2008                 } while( true );
2009
2010                 # We already know that some pages won't be in the database!
2011                 #
2012                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2013                         $this->mArticleID = 0;
2014                 }
2015                 $fragment = strstr( $dbkey, '#' );
2016                 if ( false !== $fragment ) {
2017                         $this->setFragment( $fragment );
2018                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2019                         # remove whitespace again: prevents "Foo_bar_#"
2020                         # becoming "Foo_bar_"
2021                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2022                 }
2023
2024                 # Reject illegal characters.
2025                 #
2026                 if( preg_match( $rxTc, $dbkey ) ) {
2027                         return false;
2028                 }
2029
2030                 /**
2031                  * Pages with "/./" or "/../" appearing in the URLs will
2032                  * often be unreachable due to the way web browsers deal
2033                  * with 'relative' URLs. Forbid them explicitly.
2034                  */
2035                 if ( strpos( $dbkey, '.' ) !== false &&
2036                      ( $dbkey === '.' || $dbkey === '..' ||
2037                        strpos( $dbkey, './' ) === 0  ||
2038                        strpos( $dbkey, '../' ) === 0 ||
2039                        strpos( $dbkey, '/./' ) !== false ||
2040                        strpos( $dbkey, '/../' ) !== false  ||
2041                        substr( $dbkey, -2 ) == '/.' ||
2042                        substr( $dbkey, -3 ) == '/..' ) )
2043                 {
2044                         return false;
2045                 }
2046
2047                 /**
2048                  * Magic tilde sequences? Nu-uh!
2049                  */
2050                 if( strpos( $dbkey, '~~~' ) !== false ) {
2051                         return false;
2052                 }
2053
2054                 /**
2055                  * Limit the size of titles to 255 bytes.
2056                  * This is typically the size of the underlying database field.
2057                  * We make an exception for special pages, which don't need to be stored
2058                  * in the database, and may edge over 255 bytes due to subpage syntax
2059                  * for long titles, e.g. [[Special:Block/Long name]]
2060                  */
2061                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2062                   strlen( $dbkey ) > 512 )
2063                 {
2064                         return false;
2065                 }
2066
2067                 /**
2068                  * Normally, all wiki links are forced to have
2069                  * an initial capital letter so [[foo]] and [[Foo]]
2070                  * point to the same place.
2071                  *
2072                  * Don't force it for interwikis, since the other
2073                  * site might be case-sensitive.
2074                  */
2075                 $this->mUserCaseDBKey = $dbkey;
2076                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2077                         $dbkey = $wgContLang->ucfirst( $dbkey );
2078                 }
2079
2080                 /**
2081                  * Can't make a link to a namespace alone...
2082                  * "empty" local links can only be self-links
2083                  * with a fragment identifier.
2084                  */
2085                 if( $dbkey == '' &&
2086                         $this->mInterwiki == '' &&
2087                         $this->mNamespace != NS_MAIN ) {
2088                         return false;
2089                 }
2090                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2091                 // IP names are not allowed for accounts, and can only be referring to
2092                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2093                 // there are numerous ways to present the same IP. Having sp:contribs scan
2094                 // them all is silly and having some show the edits and others not is
2095                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2096                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2097                         IP::sanitizeIP( $dbkey ) : $dbkey;
2098                 // Any remaining initial :s are illegal.
2099                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2100                         return false;
2101                 }
2102
2103                 # Fill fields
2104                 $this->mDbkeyform = $dbkey;
2105                 $this->mUrlform = wfUrlencode( $dbkey );
2106
2107                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2108
2109                 return true;
2110         }
2111
2112         /**
2113          * Set the fragment for this title
2114          * This is kind of bad, since except for this rarely-used function, Title objects
2115          * are immutable. The reason this is here is because it's better than setting the
2116          * members directly, which is what Linker::formatComment was doing previously.
2117          *
2118          * @param string $fragment text
2119          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2120          */
2121         public function setFragment( $fragment ) {
2122                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2123         }
2124
2125         /**
2126          * Get a Title object associated with the talk page of this article
2127          * @return Title the object for the talk page
2128          */
2129         public function getTalkPage() {
2130                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2131         }
2132
2133         /**
2134          * Get a title object associated with the subject page of this
2135          * talk page
2136          *
2137          * @return Title the object for the subject page
2138          */
2139         public function getSubjectPage() {
2140                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2141         }
2142
2143         /**
2144          * Get an array of Title objects linking to this Title
2145          * Also stores the IDs in the link cache.
2146          *
2147          * WARNING: do not use this function on arbitrary user-supplied titles!
2148          * On heavily-used templates it will max out the memory.
2149          *
2150          * @param string $options may be FOR UPDATE
2151          * @return array the Title objects linking here
2152          */
2153         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2154                 $linkCache =& LinkCache::singleton();
2155
2156                 if ( $options ) {
2157                         $db = wfGetDB( DB_MASTER );
2158                 } else {
2159                         $db = wfGetDB( DB_SLAVE );
2160                 }
2161
2162                 $res = $db->select( array( 'page', $table ),
2163                         array( 'page_namespace', 'page_title', 'page_id' ),
2164                         array(
2165                                 "{$prefix}_from=page_id",
2166                                 "{$prefix}_namespace" => $this->getNamespace(),
2167                                 "{$prefix}_title"     => $this->getDBkey() ),
2168                         'Title::getLinksTo',
2169                         $options );
2170
2171                 $retVal = array();
2172                 if ( $db->numRows( $res ) ) {
2173                         while ( $row = $db->fetchObject( $res ) ) {
2174                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2175                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
2176                                         $retVal[] = $titleObj;
2177                                 }
2178                         }
2179                 }
2180                 $db->freeResult( $res );
2181                 return $retVal;
2182         }
2183
2184         /**
2185          * Get an array of Title objects using this Title as a template
2186          * Also stores the IDs in the link cache.
2187          *
2188          * WARNING: do not use this function on arbitrary user-supplied titles!
2189          * On heavily-used templates it will max out the memory.
2190          *
2191          * @param string $options may be FOR UPDATE
2192          * @return array the Title objects linking here
2193          */
2194         public function getTemplateLinksTo( $options = '' ) {
2195                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2196         }
2197
2198         /**
2199          * Get an array of Title objects referring to non-existent articles linked from this page
2200          *
2201          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2202          * @param string $options may be FOR UPDATE
2203          * @return array the Title objects
2204          */
2205         public function getBrokenLinksFrom( $options = '' ) {
2206                 if ( $this->getArticleId() == 0 ) {
2207                         # All links from article ID 0 are false positives
2208                         return array();
2209                 }
2210
2211                 if ( $options ) {
2212                         $db = wfGetDB( DB_MASTER );
2213                 } else {
2214                         $db = wfGetDB( DB_SLAVE );
2215                 }
2216
2217                 $res = $db->safeQuery(
2218                           "SELECT pl_namespace, pl_title
2219                              FROM !
2220                         LEFT JOIN !
2221                                ON pl_namespace=page_namespace
2222                               AND pl_title=page_title
2223                             WHERE pl_from=?
2224                               AND page_namespace IS NULL
2225                                   !",
2226                         $db->tableName( 'pagelinks' ),
2227                         $db->tableName( 'page' ),
2228                         $this->getArticleId(),
2229                         $options );
2230
2231                 $retVal = array();
2232                 if ( $db->numRows( $res ) ) {
2233                         while ( $row = $db->fetchObject( $res ) ) {
2234                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2235                         }
2236                 }
2237                 $db->freeResult( $res );
2238                 return $retVal;
2239         }
2240
2241
2242         /**
2243          * Get a list of URLs to purge from the Squid cache when this
2244          * page changes
2245          *
2246          * @return array the URLs
2247          */
2248         public function getSquidURLs() {
2249                 global $wgContLang;
2250
2251                 $urls = array(
2252                         $this->getInternalURL(),
2253                         $this->getInternalURL( 'action=history' )
2254                 );
2255
2256                 // purge variant urls as well
2257                 if($wgContLang->hasVariants()){
2258                         $variants = $wgContLang->getVariants();
2259                         foreach($variants as $vCode){
2260                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2261                                 $urls[] = $this->getInternalURL('',$vCode);
2262                         }
2263                 }
2264
2265                 return $urls;
2266         }
2267
2268         public function purgeSquid() {
2269                 global $wgUseSquid;
2270                 if ( $wgUseSquid ) {
2271                         $urls = $this->getSquidURLs();
2272                         $u = new SquidUpdate( $urls );
2273                         $u->doUpdate();
2274                 }
2275         }
2276
2277         /**
2278          * Move this page without authentication
2279          * @param Title &$nt the new page Title
2280          */
2281         public function moveNoAuth( &$nt ) {
2282                 return $this->moveTo( $nt, false );
2283         }
2284
2285         /**
2286          * Check whether a given move operation would be valid.
2287          * Returns true if ok, or a message key string for an error message
2288          * if invalid. (Scarrrrry ugly interface this.)
2289          * @param Title &$nt the new title
2290          * @param bool $auth indicates whether $wgUser's permissions
2291          *      should be checked
2292          * @return mixed true on success, message name on failure
2293          */
2294         public function isValidMoveOperation( &$nt, $auth = true ) {
2295                 if( !$this or !$nt ) {
2296                         return 'badtitletext';
2297                 }
2298                 if( $this->equals( $nt ) ) {
2299                         return 'selfmove';
2300                 }
2301                 if( !$this->isMovable() || !$nt->isMovable() ) {
2302                         return 'immobile_namespace';
2303                 }
2304
2305                 $oldid = $this->getArticleID();
2306                 $newid = $nt->getArticleID();
2307
2308                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2309                         return 'articleexists';
2310                 }
2311                 if ( ( '' == $this->getDBkey() ) ||
2312                          ( !$oldid ) ||
2313                      ( '' == $nt->getDBkey() ) ) {
2314                         return 'badarticleerror';
2315                 }
2316
2317                 if ( $auth ) {
2318                         global $wgUser;
2319                         $errors = array_merge($this->getUserPermissionsErrors('move', $wgUser),
2320                                         $this->getUserPermissionsErrors('edit', $wgUser),
2321                                         $nt->getUserPermissionsErrors('move', $wgUser),
2322                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2323                         if($errors !== array())
2324                                 return $errors[0][0];
2325                 }
2326
2327                 global $wgUser;
2328                 $err = null;
2329                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2330                         return 'hookaborted';
2331                 }
2332
2333                 # The move is allowed only if (1) the target doesn't exist, or
2334                 # (2) the target is a redirect to the source, and has no history
2335                 # (so we can undo bad moves right after they're done).
2336
2337                 if ( 0 != $newid ) { # Target exists; check for validity
2338                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2339                                 return 'articleexists';
2340                         }
2341                 } else {
2342                         $tp = $nt->getTitleProtection();
2343                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2344                                 return 'cantmove-titleprotected';
2345                         }
2346                 }
2347                 return true;
2348         }
2349
2350         /**
2351          * Move a title to a new location
2352          * @param Title &$nt the new title
2353          * @param bool $auth indicates whether $wgUser's permissions
2354          *      should be checked
2355          * @param string $reason The reason for the move
2356          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2357          *  Ignored if the user doesn't have the suppressredirect right.
2358          * @return mixed true on success, message name on failure
2359          */
2360         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2361                 $err = $this->isValidMoveOperation( $nt, $auth );
2362                 if( is_string( $err ) ) {
2363                         return $err;
2364                 }
2365
2366                 $pageid = $this->getArticleID();
2367                 if( $nt->exists() ) {
2368                         $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2369                         $pageCountChange = ($createRedirect ? 0 : -1);
2370                 } else { # Target didn't exist, do normal move.
2371                         $this->moveToNewTitle( $nt, $reason, $createRedirect );
2372                         $pageCountChange = ($createRedirect ? 1 : 0);
2373                 }
2374                 $redirid = $this->getArticleID();
2375
2376                 // Category memberships include a sort key which may be customized.
2377                 // If it's left as the default (the page title), we need to update
2378                 // the sort key to match the new title.
2379                 //
2380                 // Be careful to avoid resetting cl_timestamp, which may disturb
2381                 // time-based lists on some sites.
2382                 //
2383                 // Warning -- if the sort key is *explicitly* set to the old title,
2384                 // we can't actually distinguish it from a default here, and it'll
2385                 // be set to the new title even though it really shouldn't.
2386                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2387                 $dbw = wfGetDB( DB_MASTER );
2388                 $dbw->update( 'categorylinks',
2389                         array(
2390                                 'cl_sortkey' => $nt->getPrefixedText(),
2391                                 'cl_timestamp=cl_timestamp' ),
2392                         array(
2393                                 'cl_from' => $pageid,
2394                                 'cl_sortkey' => $this->getPrefixedText() ),
2395                         __METHOD__ );
2396
2397                 # Update watchlists
2398
2399                 $oldnamespace = $this->getNamespace() & ~1;
2400                 $newnamespace = $nt->getNamespace() & ~1;
2401                 $oldtitle = $this->getDBkey();
2402                 $newtitle = $nt->getDBkey();
2403
2404                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2405                         WatchedItem::duplicateEntries( $this, $nt );
2406                 }
2407
2408                 # Update search engine
2409                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2410                 $u->doUpdate();
2411                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2412                 $u->doUpdate();
2413
2414                 # Update site_stats
2415                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2416                         # No longer a content page
2417                         # Not viewed, edited, removing
2418                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2419                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2420                         # Now a content page
2421                         # Not viewed, edited, adding
2422                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2423                 } elseif( $pageCountChange ) {
2424                         # Redirect added
2425                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2426                 } else {
2427                         # Nothing special
2428                         $u = false;
2429                 }
2430                 if( $u )
2431                         $u->doUpdate();
2432                 # Update message cache for interface messages
2433                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2434                         global $wgMessageCache;
2435                         $oldarticle = new Article( $this );
2436                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2437                         $newarticle = new Article( $nt );
2438                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2439                 }
2440
2441                 global $wgUser;
2442                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2443                 return true;
2444         }
2445
2446         /**
2447          * Move page to a title which is at present a redirect to the
2448          * source page
2449          *
2450          * @param Title &$nt the page to move to, which should currently
2451          *      be a redirect
2452          * @param string $reason The reason for the move
2453          * @param bool $createRedirect Whether to leave a redirect at the old title.
2454          *  Ignored if the user doesn't have the suppressredirect right
2455          */
2456         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2457                 global $wgUseSquid, $wgUser;
2458                 $fname = 'Title::moveOverExistingRedirect';
2459                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2460
2461                 if ( $reason ) {
2462                         $comment .= ": $reason";
2463                 }
2464
2465                 $now = wfTimestampNow();
2466                 $newid = $nt->getArticleID();
2467                 $oldid = $this->getArticleID();
2468                 $dbw = wfGetDB( DB_MASTER );
2469
2470                 # Delete the old redirect. We don't save it to history since
2471                 # by definition if we've got here it's rather uninteresting.
2472                 # We have to remove it so that the next step doesn't trigger
2473                 # a conflict on the unique namespace+title index...
2474                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2475                 if ( !$dbw->cascadingDeletes() ) {
2476                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2477                         global $wgUseTrackbacks;
2478                         if ($wgUseTrackbacks)
2479                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2480                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2481                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2482                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2483                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2484                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2485                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2486                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2487                 }
2488
2489                 # Save a null revision in the page's history notifying of the move
2490                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2491                 $nullRevId = $nullRevision->insertOn( $dbw );
2492
2493                 # Change the name of the target page:
2494                 $dbw->update( 'page',
2495                         /* SET */ array(
2496                                 'page_touched'   => $dbw->timestamp($now),
2497                                 'page_namespace' => $nt->getNamespace(),
2498                                 'page_title'     => $nt->getDBkey(),
2499                                 'page_latest'    => $nullRevId,
2500                         ),
2501                         /* WHERE */ array( 'page_id' => $oldid ),
2502                         $fname
2503                 );
2504                 $nt->resetArticleID( $oldid );
2505
2506                 # Recreate the redirect, this time in the other direction.
2507                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2508                 {
2509                         $mwRedir = MagicWord::get( 'redirect' );
2510                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2511                         $redirectArticle = new Article( $this );
2512                         $newid = $redirectArticle->insertOn( $dbw );
2513                         $redirectRevision = new Revision( array(
2514                                 'page'    => $newid,
2515                                 'comment' => $comment,
2516                                 'text'    => $redirectText ) );
2517                         $redirectRevision->insertOn( $dbw );
2518                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2519
2520                         # Now, we record the link from the redirect to the new title.
2521                         # It should have no other outgoing links...
2522                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2523                         $dbw->insert( 'pagelinks',
2524                                 array(
2525                                         'pl_from'      => $newid,
2526                                         'pl_namespace' => $nt->getNamespace(),
2527                                         'pl_title'     => $nt->getDBkey() ),
2528                                 $fname );
2529                 } else {
2530                         $this->resetArticleID( 0 );
2531                 }
2532
2533                 # Log the move
2534                 $log = new LogPage( 'move' );
2535                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2536
2537                 # Purge squid
2538                 if ( $wgUseSquid ) {
2539                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2540                         $u = new SquidUpdate( $urls );
2541                         $u->doUpdate();
2542                 }
2543         }
2544
2545         /**
2546          * Move page to non-existing title.
2547          * @param Title &$nt the new Title
2548          * @param string $reason The reason for the move
2549          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2550          *  Ignored if the user doesn't have the suppressredirect right
2551          */
2552         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2553                 global $wgUseSquid, $wgUser;
2554                 $fname = 'MovePageForm::moveToNewTitle';
2555                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2556                 if ( $reason ) {
2557                         $comment .= ": $reason";
2558                 }
2559
2560                 $newid = $nt->getArticleID();
2561                 $oldid = $this->getArticleID();
2562                 $dbw = wfGetDB( DB_MASTER );
2563                 $now = $dbw->timestamp();
2564
2565                 # Save a null revision in the page's history notifying of the move
2566                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2567                 $nullRevId = $nullRevision->insertOn( $dbw );
2568
2569                 # Rename page entry
2570                 $dbw->update( 'page',
2571                         /* SET */ array(
2572                                 'page_touched'   => $now,
2573                                 'page_namespace' => $nt->getNamespace(),
2574                                 'page_title'     => $nt->getDBkey(),
2575                                 'page_latest'    => $nullRevId,
2576                         ),
2577                         /* WHERE */ array( 'page_id' => $oldid ),
2578                         $fname
2579                 );
2580                 $nt->resetArticleID( $oldid );
2581
2582                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2583                 {
2584                         # Insert redirect
2585                         $mwRedir = MagicWord::get( 'redirect' );
2586                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2587                         $redirectArticle = new Article( $this );
2588                         $newid = $redirectArticle->insertOn( $dbw );
2589                         $redirectRevision = new Revision( array(
2590                                 'page'    => $newid,
2591                                 'comment' => $comment,
2592                                 'text'    => $redirectText ) );
2593                         $redirectRevision->insertOn( $dbw );
2594                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2595
2596                         # Record the just-created redirect's linking to the page
2597                         $dbw->insert( 'pagelinks',
2598                                 array(
2599                                         'pl_from'      => $newid,
2600                                         'pl_namespace' => $nt->getNamespace(),
2601                                         'pl_title'     => $nt->getDBkey() ),
2602                                 $fname );
2603                 } else {
2604                         $this->resetArticleID( 0 );
2605                 }
2606
2607                 # Log the move
2608                 $log = new LogPage( 'move' );
2609                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2610
2611                 # Purge caches as per article creation
2612                 Article::onArticleCreate( $nt );
2613
2614                 # Purge old title from squid
2615                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2616                 $this->purgeSquid();
2617         }
2618
2619         /**
2620          * Checks if $this can be moved to a given Title
2621          * - Selects for update, so don't call it unless you mean business
2622          *
2623          * @param Title &$nt the new title to check
2624          */
2625         public function isValidMoveTarget( $nt ) {
2626
2627                 $fname = 'Title::isValidMoveTarget';
2628                 $dbw = wfGetDB( DB_MASTER );
2629
2630                 # Is it a redirect?
2631                 $id  = $nt->getArticleID();
2632                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2633                         array( 'page_is_redirect','old_text','old_flags' ),
2634                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2635                         $fname, 'FOR UPDATE' );
2636
2637                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2638                         # Not a redirect
2639                         wfDebug( __METHOD__ . ": not a redirect\n" );
2640                         return false;
2641                 }
2642                 $text = Revision::getRevisionText( $obj );
2643
2644                 # Does the redirect point to the source?
2645                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2646                 $m = array();
2647                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2648                         $redirTitle = Title::newFromText( $m[1] );
2649                         if( !is_object( $redirTitle ) ||
2650                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2651                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2652                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2653                                 return false;
2654                         }
2655                 } else {
2656                         # Fail safe
2657                         wfDebug( __METHOD__ . ": failsafe\n" );
2658                         return false;
2659                 }
2660
2661                 # Does the article have a history?
2662                 $row = $dbw->selectRow( array( 'page', 'revision'),
2663                         array( 'rev_id' ),
2664                         array( 'page_namespace' => $nt->getNamespace(),
2665                                 'page_title' => $nt->getDBkey(),
2666                                 'page_id=rev_page AND page_latest != rev_id'
2667                         ), $fname, 'FOR UPDATE'
2668                 );
2669
2670                 # Return true if there was no history
2671                 return $row === false;
2672         }
2673
2674         /**
2675          * Can this title be added to a user's watchlist?
2676          *
2677          * @return bool
2678          */
2679         public function isWatchable() {
2680                 return !$this->isExternal()
2681                         && Namespace::isWatchable( $this->getNamespace() );
2682         }
2683
2684         /**
2685          * Get categories to which this Title belongs and return an array of
2686          * categories' names.
2687          *
2688          * @return array an array of parents in the form:
2689          *      $parent => $currentarticle
2690          */
2691         public function getParentCategories() {
2692                 global $wgContLang;
2693
2694                 $titlekey = $this->getArticleId();
2695                 $dbr = wfGetDB( DB_SLAVE );
2696                 $categorylinks = $dbr->tableName( 'categorylinks' );
2697
2698                 # NEW SQL
2699                 $sql = "SELECT * FROM $categorylinks"
2700                      ." WHERE cl_from='$titlekey'"
2701                          ." AND cl_from <> '0'"
2702                          ." ORDER BY cl_sortkey";
2703
2704                 $res = $dbr->query ( $sql ) ;
2705
2706                 if($dbr->numRows($res) > 0) {
2707                         while ( $x = $dbr->fetchObject ( $res ) )
2708                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2709                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2710                         $dbr->freeResult ( $res ) ;
2711                 } else {
2712                         $data = array();
2713                 }
2714                 return $data;
2715         }
2716
2717         /**
2718          * Get a tree of parent categories
2719          * @param array $children an array with the children in the keys, to check for circular refs
2720          * @return array
2721          */
2722         public function getParentCategoryTree( $children = array() ) {
2723                 $parents = $this->getParentCategories();
2724
2725                 if($parents != '') {
2726                         foreach($parents as $parent => $current) {
2727                                 if ( array_key_exists( $parent, $children ) ) {
2728                                         # Circular reference
2729                                         $stack[$parent] = array();
2730                                 } else {
2731                                         $nt = Title::newFromText($parent);
2732                                         if ( $nt ) {
2733                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2734                                         }
2735                                 }
2736                         }
2737                         return $stack;
2738                 } else {
2739                         return array();
2740                 }
2741         }
2742
2743
2744         /**
2745          * Get an associative array for selecting this title from
2746          * the "page" table
2747          *
2748          * @return array
2749          */
2750         public function pageCond() {
2751                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2752         }
2753
2754         /**
2755          * Get the revision ID of the previous revision
2756          *
2757          * @param integer $revision  Revision ID. Get the revision that was before this one.
2758          * @return integer $oldrevision|false
2759          */
2760         public function getPreviousRevisionID( $revision ) {
2761                 $dbr = wfGetDB( DB_SLAVE );
2762                 return $dbr->selectField( 'revision', 'rev_id',
2763                         'rev_page=' . intval( $this->getArticleId() ) .
2764                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2765         }
2766
2767         /**
2768          * Get the revision ID of the next revision
2769          *
2770          * @param integer $revision  Revision ID. Get the revision that was after this one.
2771          * @return integer $oldrevision|false
2772          */
2773         public function getNextRevisionID( $revision ) {
2774                 $dbr = wfGetDB( DB_SLAVE );
2775                 return $dbr->selectField( 'revision', 'rev_id',
2776                         'rev_page=' . intval( $this->getArticleId() ) .
2777                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2778         }
2779
2780         /**
2781          * Get the number of revisions between the given revision IDs.
2782          *
2783          * @param integer $old  Revision ID.
2784          * @param integer $new  Revision ID.
2785          * @return integer  Number of revisions between these IDs.
2786          */
2787         public function countRevisionsBetween( $old, $new ) {
2788                 $dbr = wfGetDB( DB_SLAVE );
2789                 return $dbr->selectField( 'revision', 'count(*)',
2790                         'rev_page = ' . intval( $this->getArticleId() ) .
2791                         ' AND rev_id > ' . intval( $old ) .
2792                         ' AND rev_id < ' . intval( $new ) );
2793         }
2794
2795         /**
2796          * Compare with another title.
2797          *
2798          * @param Title $title
2799          * @return bool
2800          */
2801         public function equals( $title ) {
2802                 // Note: === is necessary for proper matching of number-like titles.
2803                 return $this->getInterwiki() === $title->getInterwiki()
2804                         && $this->getNamespace() == $title->getNamespace()
2805                         && $this->getDBkey() === $title->getDBkey();
2806         }
2807
2808         /**
2809          * Return a string representation of this title
2810          *
2811          * @return string
2812          */
2813         public function __toString() {
2814                 return $this->getPrefixedText();
2815         }
2816
2817         /**
2818          * Check if page exists
2819          * @return bool
2820          */
2821         public function exists() {
2822                 return $this->getArticleId() != 0;
2823         }
2824
2825         /**
2826          * Do we know that this title definitely exists, or should we otherwise
2827          * consider that it exists?
2828          *
2829          * @return bool
2830          */
2831         public function isAlwaysKnown() {
2832                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2833                 // the full l10n of that language to be loaded. That takes much memory and
2834                 // isn't needed. So we strip the language part away.
2835                 // Also, extension messages which are not loaded, are shown as red, because
2836                 // we don't call MessageCache::loadAllMessages.
2837                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2838                 return $this->isExternal()
2839                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2840                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2841         }
2842
2843         /**
2844          * Update page_touched timestamps and send squid purge messages for
2845          * pages linking to this title. May be sent to the job queue depending
2846          * on the number of links. Typically called on create and delete.
2847          */
2848         public function touchLinks() {
2849                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2850                 $u->doUpdate();
2851
2852                 if ( $this->getNamespace() == NS_CATEGORY ) {
2853                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2854                         $u->doUpdate();
2855                 }
2856         }
2857
2858         /**
2859          * Get the last touched timestamp
2860          */
2861         public function getTouched() {
2862                 $dbr = wfGetDB( DB_SLAVE );
2863                 $touched = $dbr->selectField( 'page', 'page_touched',
2864                         array(
2865                                 'page_namespace' => $this->getNamespace(),
2866                                 'page_title' => $this->getDBkey()
2867                         ), __METHOD__
2868                 );
2869                 return $touched;
2870         }
2871
2872         public function trackbackURL() {
2873                 global $wgTitle, $wgScriptPath, $wgServer;
2874
2875                 return "$wgServer$wgScriptPath/trackback.php?article="
2876                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2877         }
2878
2879         public function trackbackRDF() {
2880                 $url = htmlspecialchars($this->getFullURL());
2881                 $title = htmlspecialchars($this->getText());
2882                 $tburl = $this->trackbackURL();
2883
2884                 return "
2885 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2886          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2887          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2888 <rdf:Description
2889    rdf:about=\"$url\"
2890    dc:identifier=\"$url\"
2891    dc:title=\"$title\"
2892    trackback:ping=\"$tburl\" />
2893 </rdf:RDF>";
2894         }
2895
2896         /**
2897          * Generate strings used for xml 'id' names in monobook tabs
2898          * @return string
2899          */
2900         public function getNamespaceKey() {
2901                 global $wgContLang;
2902                 switch ($this->getNamespace()) {
2903                         case NS_MAIN:
2904                         case NS_TALK:
2905                                 return 'nstab-main';
2906                         case NS_USER:
2907                         case NS_USER_TALK:
2908                                 return 'nstab-user';
2909                         case NS_MEDIA:
2910                                 return 'nstab-media';
2911                         case NS_SPECIAL:
2912                                 return 'nstab-special';
2913                         case NS_PROJECT:
2914                         case NS_PROJECT_TALK:
2915                                 return 'nstab-project';
2916                         case NS_IMAGE:
2917                         case NS_IMAGE_TALK:
2918                                 return 'nstab-image';
2919                         case NS_MEDIAWIKI:
2920                         case NS_MEDIAWIKI_TALK:
2921                                 return 'nstab-mediawiki';
2922                         case NS_TEMPLATE:
2923                         case NS_TEMPLATE_TALK:
2924                                 return 'nstab-template';
2925                         case NS_HELP:
2926                         case NS_HELP_TALK:
2927                                 return 'nstab-help';
2928                         case NS_CATEGORY:
2929                         case NS_CATEGORY_TALK:
2930                                 return 'nstab-category';
2931                         default:
2932                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2933                 }
2934         }
2935
2936         /**
2937          * Returns true if this title resolves to the named special page
2938          * @param string $name The special page name
2939          */
2940         public function isSpecial( $name ) {
2941                 if ( $this->getNamespace() == NS_SPECIAL ) {
2942                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2943                         if ( $name == $thisName ) {
2944                                 return true;
2945                         }
2946                 }
2947                 return false;
2948         }
2949
2950         /**
2951          * If the Title refers to a special page alias which is not the local default,
2952          * returns a new Title which points to the local default. Otherwise, returns $this.
2953          */
2954         public function fixSpecialName() {
2955                 if ( $this->getNamespace() == NS_SPECIAL ) {
2956                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2957                         if ( $canonicalName ) {
2958                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2959                                 if ( $localName != $this->mDbkeyform ) {
2960                                         return Title::makeTitle( NS_SPECIAL, $localName );
2961                                 }
2962                         }
2963                 }
2964                 return $this;
2965         }
2966
2967         /**
2968          * Is this Title in a namespace which contains content?
2969          * In other words, is this a content page, for the purposes of calculating
2970          * statistics, etc?
2971          *
2972          * @return bool
2973          */
2974         public function isContentPage() {
2975                 return Namespace::isContent( $this->getNamespace() );
2976         }
2977
2978 }