includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 if ( !class_exists( 'UtfNormal' ) ) {
   9         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  10 }
  11
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 # Constants for pr_cascade bitfield
  22 define( 'CASCADE', 1 );
  23
  24 /**
  25  * Title class
  26  * - Represents a title, which may contain an interwiki designation or namespace
  27  * - Can fetch various kinds of data from the database, albeit inefficiently.
  28  *
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43         /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;                 # Text form (spaces not underscores) of the main part
  48         var $mUrlform;                  # URL-encoded form of the main part
  49         var $mDbkeyform;                # Main part with underscores
  50         var $mUserCaseDBKey;        # DB key with the initial letter in the case specified by the user
  51         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki;                # Interwiki prefix (or null string)
  53         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  54         var $mArticleID;                # Article ID, fetched from the link cache on demand
  55         var $mLatestID;                 # ID of most recent revision
  56         var $mRestrictions;             # Array of groups allowed to edit this article
  57         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  58         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  59         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  60         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  61         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  62         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  63         var $mDefaultNamespace;         # Namespace index when there is no namespace
  64                                         # Zero except in {{transclusion}} tags
  65         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  66         /**#@-*/
  67
  68
  69         /**
  70          * Constructor
  71          * @private
  72          */
  73         /* private */ function __construct() {
  74                 $this->mInterwiki = $this->mUrlform =
  75                 $this->mTextform = $this->mDbkeyform = '';
  76                 $this->mArticleID = -1;
  77                 $this->mNamespace = NS_MAIN;
  78                 $this->mRestrictionsLoaded = false;
  79                 $this->mRestrictions = array();
  80                 # Dont change the following, NS_MAIN is hardcoded in several place
  81                 # See bug #696
  82                 $this->mDefaultNamespace = NS_MAIN;
  83                 $this->mWatched = NULL;
  84                 $this->mLatestID = false;
  85                 $this->mOldRestrictions = false;
  86         }
  87
  88         /**
  89          * Create a new Title from a prefixed DB key
  90          * @param string $key The database key, which has underscores
  91          *      instead of spaces, possibly including namespace and
  92          *      interwiki prefixes
  93          * @return Title the new object, or NULL on an error
  94          */
  95         public static function newFromDBkey( $key ) {
  96                 $t = new Title();
  97                 $t->mDbkeyform = $key;
  98                 if( $t->secureAndSplit() )
  99                         return $t;
 100                 else
 101                         return NULL;
 102         }
 103
 104         /**
 105          * Create a new Title from text, such as what one would
 106          * find in a link. Decodes any HTML entities in the text.
 107          *
 108          * @param string $text the link text; spaces, prefixes,
 109          *      and an initial ':' indicating the main namespace
 110          *      are accepted
 111          * @param int $defaultNamespace the namespace to use if
 112          *      none is specified by a prefix
 113          * @return Title the new object, or NULL on an error
 114          */
 115         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 116                 if( is_object( $text ) ) {
 117                         throw new MWException( 'Title::newFromText given an object' );
 118                 }
 119
 120                 /**
 121                  * Wiki pages often contain multiple links to the same page.
 122                  * Title normalization and parsing can become expensive on
 123                  * pages with many links, so we can save a little time by
 124                  * caching them.
 125                  *
 126                  * In theory these are value objects and won't get changed...
 127                  */
 128                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 129                         return Title::$titleCache[$text];
 130                 }
 131
 132                 /**
 133                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 134                  */
 135                 $filteredText = Sanitizer::decodeCharReferences( $text );
 136
 137                 $t = new Title();
 138                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 139                 $t->mDefaultNamespace = $defaultNamespace;
 140
 141                 static $cachedcount = 0 ;
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         Title::$titleCache = array();
 147                                         $cachedcount=0;
 148                                 }
 149                                 $cachedcount++;
 150                                 Title::$titleCache[$text] =& $t;
 151                         }
 152                         return $t;
 153                 } else {
 154                         $ret = NULL;
 155                         return $ret;
 156                 }
 157         }
 158
 159         /**
 160          * Create a new Title from URL-encoded text. Ensures that
 161          * the given title's length does not exceed the maximum.
 162          * @param string $url the title, as might be taken from a URL
 163          * @return Title the new object, or NULL on an error
 164          */
 165         public static function newFromURL( $url ) {
 166                 global $wgLegalTitleChars;
 167                 $t = new Title();
 168
 169                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 170                 # but some URLs used it as a space replacement and they still come
 171                 # from some external search tools.
 172                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 173                         $url = str_replace( '+', ' ', $url );
 174                 }
 175
 176                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 177                 if( $t->secureAndSplit() ) {
 178                         return $t;
 179                 } else {
 180                         return NULL;
 181                 }
 182         }
 183
 184         /**
 185          * Create a new Title from an article ID
 186          *
 187          * @todo This is inefficiently implemented, the page row is requested
 188          *       but not used for anything else
 189          *
 190          * @param int $id the page_id corresponding to the Title to create
 191          * @return Title the new object, or NULL on an error
 192          */
 193         public static function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr = wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          */
 209         public static function newFromIDs( $ids ) {
 210                 if ( !count( $ids ) ) {
 211                         return array();
 212                 }
 213                 $dbr = wfGetDB( DB_SLAVE );
 214                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 215                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 216
 217                 $titles = array();
 218                 while ( $row = $dbr->fetchObject( $res ) ) {
 219                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 220                 }
 221                 return $titles;
 222         }
 223
 224         /**
 225          * Create a new Title from a namespace index and a DB key.
 226          * It's assumed that $ns and $title are *valid*, for instance when
 227          * they came directly from the database or a special page name.
 228          * For convenience, spaces are converted to underscores so that
 229          * eg user_text fields can be used directly.
 230          *
 231          * @param int $ns the namespace of the article
 232          * @param string $title the unprefixed database key form
 233          * @return Title the new object
 234          */
 235         public static function &makeTitle( $ns, $title ) {
 236                 $t = new Title();
 237                 $t->mInterwiki = '';
 238                 $t->mFragment = '';
 239                 $t->mNamespace = $ns = intval( $ns );
 240                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 241                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 242                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 243                 $t->mTextform = str_replace( '_', ' ', $title );
 244                 return $t;
 245         }
 246
 247         /**
 248          * Create a new Title from a namespace index and a DB key.
 249          * The parameters will be checked for validity, which is a bit slower
 250          * than makeTitle() but safer for user-provided data.
 251          *
 252          * @param int $ns the namespace of the article
 253          * @param string $title the database key form
 254          * @return Title the new object, or NULL on an error
 255          */
 256         public static function makeTitleSafe( $ns, $title ) {
 257                 $t = new Title();
 258                 $t->mDbkeyform = Title::makeName( $ns, $title );
 259                 if( $t->secureAndSplit() ) {
 260                         return $t;
 261                 } else {
 262                         return NULL;
 263                 }
 264         }
 265
 266         /**
 267          * Create a new Title for the Main Page
 268          * @return Title the new object
 269          */
 270         public static function newMainPage() {
 271                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 272                 // Don't give fatal errors if the message is broken
 273                 if ( !$title ) {
 274                         $title = Title::newFromText( 'Main Page' );
 275                 }
 276                 return $title;
 277         }
 278
 279         /**
 280          * Extract a redirect destination from a string and return the
 281          * Title, or null if the text doesn't contain a valid redirect
 282          *
 283          * @param string $text Text with possible redirect
 284          * @return Title
 285          */
 286         public static function newFromRedirect( $text ) {
 287                 $redir = MagicWord::get( 'redirect' );
 288                 if( $redir->matchStart( trim($text) ) ) {
 289                         // Extract the first link and see if it's usable
 290                         $m = array();
 291                         if( preg_match( '!\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 292                                 // Strip preceding colon used to "escape" categories, etc.
 293                                 // and URL-decode links
 294                                 if( strpos( $m[1], '%' ) !== false ) {
 295                                         // Match behavior of inline link parsing here;
 296                                         // don't interpret + as " " most of the time!
 297                                         // It might be safe to just use rawurldecode instead, though.
 298                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 299                                 }
 300                                 $title = Title::newFromText( $m[1] );
 301                                 // Redirects to Special:Userlogout are not permitted
 302                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 303                                         return $title;
 304                         }
 305                 }
 306                 return null;
 307         }
 308
 309 #----------------------------------------------------------------------------
 310 #       Static functions
 311 #----------------------------------------------------------------------------
 312
 313         /**
 314          * Get the prefixed DB key associated with an ID
 315          * @param int $id the page_id of the article
 316          * @return Title an object representing the article, or NULL
 317          *      if no such article was found
 318          * @static
 319          * @access public
 320          */
 321         function nameOf( $id ) {
 322                 $fname = 'Title::nameOf';
 323                 $dbr = wfGetDB( DB_SLAVE );
 324
 325                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 326                 if ( $s === false ) { return NULL; }
 327
 328                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 329                 return $n;
 330         }
 331
 332         /**
 333          * Get a regex character class describing the legal characters in a link
 334          * @return string the list of characters, not delimited
 335          */
 336         public static function legalChars() {
 337                 global $wgLegalTitleChars;
 338                 return $wgLegalTitleChars;
 339         }
 340
 341         /**
 342          * Get a string representation of a title suitable for
 343          * including in a search index
 344          *
 345          * @param int $ns a namespace index
 346          * @param string $title text-form main part
 347          * @return string a stripped-down title string ready for the
 348          *      search index
 349          */
 350         public static function indexTitle( $ns, $title ) {
 351                 global $wgContLang;
 352
 353                 $lc = SearchEngine::legalSearchChars() . '&#;';
 354                 $t = $wgContLang->stripForSearch( $title );
 355                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 356                 $t = $wgContLang->lc( $t );
 357
 358                 # Handle 's, s'
 359                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 360                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 361
 362                 $t = preg_replace( "/\\s+/", ' ', $t );
 363
 364                 if ( $ns == NS_IMAGE ) {
 365                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 366                 }
 367                 return trim( $t );
 368         }
 369
 370         /*
 371          * Make a prefixed DB key from a DB key and a namespace index
 372          * @param int $ns numerical representation of the namespace
 373          * @param string $title the DB key form the title
 374          * @return string the prefixed form of the title
 375          */
 376         public static function makeName( $ns, $title ) {
 377                 global $wgContLang;
 378
 379                 $n = $wgContLang->getNsText( $ns );
 380                 return $n == '' ? $title : "$n:$title";
 381         }
 382
 383         /**
 384          * Returns the URL associated with an interwiki prefix
 385          * @param string $key the interwiki prefix (e.g. "MeatBall")
 386          * @return the associated URL, containing "$1", which should be
 387          *      replaced by an article title
 388          * @static (arguably)
 389          */
 390         public function getInterwikiLink( $key )  {
 391                 global $wgMemc, $wgInterwikiExpiry;
 392                 global $wgInterwikiCache, $wgContLang;
 393                 $fname = 'Title::getInterwikiLink';
 394
 395                 $key = $wgContLang->lc( $key );
 396
 397                 $k = wfMemcKey( 'interwiki', $key );
 398                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 399                         return Title::$interwikiCache[$k]->iw_url;
 400                 }
 401
 402                 if ($wgInterwikiCache) {
 403                         return Title::getInterwikiCached( $key );
 404                 }
 405
 406                 $s = $wgMemc->get( $k );
 407                 # Ignore old keys with no iw_local
 408                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 409                         Title::$interwikiCache[$k] = $s;
 410                         return $s->iw_url;
 411                 }
 412
 413                 $dbr = wfGetDB( DB_SLAVE );
 414                 $res = $dbr->select( 'interwiki',
 415                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 416                         array( 'iw_prefix' => $key ), $fname );
 417                 if( !$res ) {
 418                         return '';
 419                 }
 420
 421                 $s = $dbr->fetchObject( $res );
 422                 if( !$s ) {
 423                         # Cache non-existence: create a blank object and save it to memcached
 424                         $s = (object)false;
 425                         $s->iw_url = '';
 426                         $s->iw_local = 0;
 427                         $s->iw_trans = 0;
 428                 }
 429                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 430                 Title::$interwikiCache[$k] = $s;
 431
 432                 return $s->iw_url;
 433         }
 434
 435         /**
 436          * Fetch interwiki prefix data from local cache in constant database
 437          *
 438          * More logic is explained in DefaultSettings
 439          *
 440          * @return string URL of interwiki site
 441          */
 442         public static function getInterwikiCached( $key ) {
 443                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 444                 static $db, $site;
 445
 446                 if (!$db)
 447                         $db=dba_open($wgInterwikiCache,'r','cdb');
 448                 /* Resolve site name */
 449                 if ($wgInterwikiScopes>=3 and !$site) {
 450                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 451                         if ($site=="")
 452                                 $site = $wgInterwikiFallbackSite;
 453                 }
 454                 $value = dba_fetch( wfMemcKey( $key ), $db);
 455                 if ($value=='' and $wgInterwikiScopes>=3) {
 456                         /* try site-level */
 457                         $value = dba_fetch("_{$site}:{$key}", $db);
 458                 }
 459                 if ($value=='' and $wgInterwikiScopes>=2) {
 460                         /* try globals */
 461                         $value = dba_fetch("__global:{$key}", $db);
 462                 }
 463                 if ($value=='undef')
 464                         $value='';
 465                 $s = (object)false;
 466                 $s->iw_url = '';
 467                 $s->iw_local = 0;
 468                 $s->iw_trans = 0;
 469                 if ($value!='') {
 470                         list($local,$url)=explode(' ',$value,2);
 471                         $s->iw_url=$url;
 472                         $s->iw_local=(int)$local;
 473                 }
 474                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 475                 return $s->iw_url;
 476         }
 477         /**
 478          * Determine whether the object refers to a page within
 479          * this project.
 480          *
 481          * @return bool TRUE if this is an in-project interwiki link
 482          *      or a wikilink, FALSE otherwise
 483          */
 484         public function isLocal() {
 485                 if ( $this->mInterwiki != '' ) {
 486                         # Make sure key is loaded into cache
 487                         $this->getInterwikiLink( $this->mInterwiki );
 488                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 489                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 490                 } else {
 491                         return true;
 492                 }
 493         }
 494
 495         /**
 496          * Determine whether the object refers to a page within
 497          * this project and is transcludable.
 498          *
 499          * @return bool TRUE if this is transcludable
 500          */
 501         public function isTrans() {
 502                 if ($this->mInterwiki == '')
 503                         return false;
 504                 # Make sure key is loaded into cache
 505                 $this->getInterwikiLink( $this->mInterwiki );
 506                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 507                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 508         }
 509
 510         /**
 511          * Escape a text fragment, say from a link, for a URL
 512          */
 513         static function escapeFragmentForURL( $fragment ) {
 514                 $fragment = str_replace( ' ', '_', $fragment );
 515                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 516                 $replaceArray = array(
 517                         '%3A' => ':',
 518                         '%' => '.'
 519                 );
 520                 return strtr( $fragment, $replaceArray );
 521         }
 522
 523 #----------------------------------------------------------------------------
 524 #       Other stuff
 525 #----------------------------------------------------------------------------
 526
 527         /** Simple accessors */
 528         /**
 529          * Get the text form (spaces not underscores) of the main part
 530          * @return string
 531          */
 532         public function getText() { return $this->mTextform; }
 533         /**
 534          * Get the URL-encoded form of the main part
 535          * @return string
 536          */
 537         public function getPartialURL() { return $this->mUrlform; }
 538         /**
 539          * Get the main part with underscores
 540          * @return string
 541          */
 542         public function getDBkey() { return $this->mDbkeyform; }
 543         /**
 544          * Get the namespace index, i.e. one of the NS_xxxx constants
 545          * @return int
 546          */
 547         public function getNamespace() { return $this->mNamespace; }
 548         /**
 549          * Get the namespace text
 550          * @return string
 551          */
 552         public function getNsText() {
 553                 global $wgContLang, $wgCanonicalNamespaceNames;
 554
 555                 if ( '' != $this->mInterwiki ) {
 556                         // This probably shouldn't even happen. ohh man, oh yuck.
 557                         // But for interwiki transclusion it sometimes does.
 558                         // Shit. Shit shit shit.
 559                         //
 560                         // Use the canonical namespaces if possible to try to
 561                         // resolve a foreign namespace.
 562                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 563                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 564                         }
 565                 }
 566                 return $wgContLang->getNsText( $this->mNamespace );
 567         }
 568         /**
 569          * Get the DB key with the initial letter case as specified by the user
 570          */
 571         function getUserCaseDBKey() {
 572                 return $this->mUserCaseDBKey;
 573         }
 574         /**
 575          * Get the namespace text of the subject (rather than talk) page
 576          * @return string
 577          */
 578         public function getSubjectNsText() {
 579                 global $wgContLang;
 580                 return $wgContLang->getNsText( MWNamespace::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( MWNamespace::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( MWNamespace::canTalk( $this->mNamespace ) );
 598         }
 599
 600         /**
 601          * Get the interwiki prefix (or null string)
 602          * @return string
 603          */
 604         public function getInterwiki() { return $this->mInterwiki; }
 605         /**
 606          * Get the Title fragment (i.e. the bit after the #) in text form
 607          * @return string
 608          */
 609         public function getFragment() { return $this->mFragment; }
 610         /**
 611          * Get the fragment in URL form, including the "#" character if there is one
 612          * @return string
 613          */
 614         public function getFragmentForURL() {
 615                 if ( $this->mFragment == '' ) {
 616                         return '';
 617                 } else {
 618                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 619                 }
 620         }
 621         /**
 622          * Get the default namespace index, for when there is no namespace
 623          * @return int
 624          */
 625         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 626
 627         /**
 628          * Get title for search index
 629          * @return string a stripped-down title string ready for the
 630          *      search index
 631          */
 632         public function getIndexTitle() {
 633                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 634         }
 635
 636         /**
 637          * Get the prefixed database key form
 638          * @return string the prefixed title, with underscores and
 639          *      any interwiki and namespace prefixes
 640          */
 641         public function getPrefixedDBkey() {
 642                 $s = $this->prefix( $this->mDbkeyform );
 643                 $s = str_replace( ' ', '_', $s );
 644                 return $s;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces.
 649          * This is the form usually used for display
 650          * @return string the prefixed title, with spaces
 651          */
 652         public function getPrefixedText() {
 653                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 654                         $s = $this->prefix( $this->mTextform );
 655                         $s = str_replace( '_', ' ', $s );
 656                         $this->mPrefixedText = $s;
 657                 }
 658                 return $this->mPrefixedText;
 659         }
 660
 661         /**
 662          * Get the prefixed title with spaces, plus any fragment
 663          * (part beginning with '#')
 664          * @return string the prefixed title, with spaces and
 665          *      the fragment, including '#'
 666          */
 667         public function getFullText() {
 668                 $text = $this->getPrefixedText();
 669                 if( '' != $this->mFragment ) {
 670                         $text .= '#' . $this->mFragment;
 671                 }
 672                 return $text;
 673         }
 674
 675         /**
 676          * Get the base name, i.e. the leftmost parts before the /
 677          * @return string Base name
 678          */
 679         public function getBaseText() {
 680                 global $wgNamespacesWithSubpages;
 681                 if( !empty( $wgNamespacesWithSubpages[$this->mNamespace] ) ) {
 682                         $parts = explode( '/', $this->getText() );
 683                         # Don't discard the real title if there's no subpage involved
 684                         if( count( $parts ) > 1 )
 685                                 unset( $parts[ count( $parts ) - 1 ] );
 686                         return implode( '/', $parts );
 687                 } else {
 688                         return $this->getText();
 689                 }
 690         }
 691
 692         /**
 693          * Get the lowest-level subpage name, i.e. the rightmost part after /
 694          * @return string Subpage name
 695          */
 696         public function getSubpageText() {
 697                 global $wgNamespacesWithSubpages;
 698                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 699                         $parts = explode( '/', $this->mTextform );
 700                         return( $parts[ count( $parts ) - 1 ] );
 701                 } else {
 702                         return( $this->mTextform );
 703                 }
 704         }
 705
 706         /**
 707          * Get a URL-encoded form of the subpage text
 708          * @return string URL-encoded subpage name
 709          */
 710         public function getSubpageUrlForm() {
 711                 $text = $this->getSubpageText();
 712                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 713                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 714                 return( $text );
 715         }
 716
 717         /**
 718          * Get a URL-encoded title (not an actual URL) including interwiki
 719          * @return string the URL-encoded form
 720          */
 721         public function getPrefixedURL() {
 722                 $s = $this->prefix( $this->mDbkeyform );
 723                 $s = str_replace( ' ', '_', $s );
 724
 725                 $s = wfUrlencode ( $s ) ;
 726
 727                 # Cleaning up URL to make it look nice -- is this safe?
 728                 $s = str_replace( '%28', '(', $s );
 729                 $s = str_replace( '%29', ')', $s );
 730
 731                 return $s;
 732         }
 733
 734         /**
 735          * Get a real URL referring to this title, with interwiki link and
 736          * fragment
 737          *
 738          * @param string $query an optional query string, not used
 739          *      for interwiki links
 740          * @param string $variant language variant of url (for sr, zh..)
 741          * @return string the URL
 742          */
 743         public function getFullURL( $query = '', $variant = false ) {
 744                 global $wgContLang, $wgServer, $wgRequest;
 745
 746                 if ( '' == $this->mInterwiki ) {
 747                         $url = $this->getLocalUrl( $query, $variant );
 748
 749                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 750                         // Correct fix would be to move the prepending elsewhere.
 751                         if ($wgRequest->getVal('action') != 'render') {
 752                                 $url = $wgServer . $url;
 753                         }
 754                 } else {
 755                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 756
 757                         $namespace = wfUrlencode( $this->getNsText() );
 758                         if ( '' != $namespace ) {
 759                                 # Can this actually happen? Interwikis shouldn't be parsed.
 760                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 761                                 $namespace .= ':';
 762                         }
 763                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 764                         $url = wfAppendQuery( $url, $query );
 765                 }
 766
 767                 # Finally, add the fragment.
 768                 $url .= $this->getFragmentForURL();
 769
 770                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 771                 return $url;
 772         }
 773
 774         /**
 775          * Get a URL with no fragment or server name.  If this page is generated
 776          * with action=render, $wgServer is prepended.
 777          * @param string $query an optional query string; if not specified,
 778          *      $wgArticlePath will be used.
 779          * @param string $variant language variant of url (for sr, zh..)
 780          * @return string the URL
 781          */
 782         public function getLocalURL( $query = '', $variant = false ) {
 783                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 784                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 785
 786                 // internal links should point to same variant as current page (only anonymous users)
 787                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 788                         $pref = $wgContLang->getPreferredVariant(false);
 789                         if($pref != $wgContLang->getCode())
 790                                 $variant = $pref;
 791                 }
 792
 793                 if ( $this->isExternal() ) {
 794                         $url = $this->getFullURL();
 795                         if ( $query ) {
 796                                 // This is currently only used for edit section links in the
 797                                 // context of interwiki transclusion. In theory we should
 798                                 // append the query to the end of any existing query string,
 799                                 // but interwiki transclusion is already broken in that case.
 800                                 $url .= "?$query";
 801                         }
 802                 } else {
 803                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 804                         if ( $query == '' ) {
 805                                 if( $variant != false && $wgContLang->hasVariants() ) {
 806                                         if( $wgVariantArticlePath == false ) {
 807                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 808                                         } else {
 809                                                 $variantArticlePath = $wgVariantArticlePath;
 810                                         }
 811                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 812                                         $url = str_replace( '$1', $dbkey, $url  );
 813                                 } else {
 814                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 815                                 }
 816                         } else {
 817                                 global $wgActionPaths;
 818                                 $url = false;
 819                                 $matches = array();
 820                                 if( !empty( $wgActionPaths ) &&
 821                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 822                                 {
 823                                         $action = urldecode( $matches[2] );
 824                                         if( isset( $wgActionPaths[$action] ) ) {
 825                                                 $query = $matches[1];
 826                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 827                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 828                                                 if( $query != '' ) $url .= '?' . $query;
 829                                         }
 830                                 }
 831                                 if ( $url === false ) {
 832                                         if ( $query == '-' ) {
 833                                                 $query = '';
 834                                         }
 835                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 836                                 }
 837                         }
 838
 839                         // FIXME: this causes breakage in various places when we
 840                         // actually expected a local URL and end up with dupe prefixes.
 841                         if ($wgRequest->getVal('action') == 'render') {
 842                                 $url = $wgServer . $url;
 843                         }
 844                 }
 845                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 846                 return $url;
 847         }
 848
 849         /**
 850          * Get an HTML-escaped version of the URL form, suitable for
 851          * using in a link, without a server name or fragment
 852          * @param string $query an optional query string
 853          * @return string the URL
 854          */
 855         public function escapeLocalURL( $query = '' ) {
 856                 return htmlspecialchars( $this->getLocalURL( $query ) );
 857         }
 858
 859         /**
 860          * Get an HTML-escaped version of the URL form, suitable for
 861          * using in a link, including the server name and fragment
 862          *
 863          * @return string the URL
 864          * @param string $query an optional query string
 865          */
 866         public function escapeFullURL( $query = '' ) {
 867                 return htmlspecialchars( $this->getFullURL( $query ) );
 868         }
 869
 870         /**
 871          * Get the URL form for an internal link.
 872          * - Used in various Squid-related code, in case we have a different
 873          * internal hostname for the server from the exposed one.
 874          *
 875          * @param string $query an optional query string
 876          * @param string $variant language variant of url (for sr, zh..)
 877          * @return string the URL
 878          */
 879         public function getInternalURL( $query = '', $variant = false ) {
 880                 global $wgInternalServer;
 881                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 882                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 883                 return $url;
 884         }
 885
 886         /**
 887          * Get the edit URL for this Title
 888          * @return string the URL, or a null string if this is an
 889          *      interwiki link
 890          */
 891         public function getEditURL() {
 892                 if ( '' != $this->mInterwiki ) { return ''; }
 893                 $s = $this->getLocalURL( 'action=edit' );
 894
 895                 return $s;
 896         }
 897
 898         /**
 899          * Get the HTML-escaped displayable text form.
 900          * Used for the title field in <a> tags.
 901          * @return string the text, including any prefixes
 902          */
 903         public function getEscapedText() {
 904                 return htmlspecialchars( $this->getPrefixedText() );
 905         }
 906
 907         /**
 908          * Is this Title interwiki?
 909          * @return boolean
 910          */
 911         public function isExternal() { return ( '' != $this->mInterwiki ); }
 912
 913         /**
 914          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 915          *
 916          * @param string Action to check (default: edit)
 917          * @return bool
 918          */
 919         public function isSemiProtected( $action = 'edit' ) {
 920                 if( $this->exists() ) {
 921                         $restrictions = $this->getRestrictions( $action );
 922                         if( count( $restrictions ) > 0 ) {
 923                                 foreach( $restrictions as $restriction ) {
 924                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 925                                                 return false;
 926                                 }
 927                         } else {
 928                                 # Not protected
 929                                 return false;
 930                         }
 931                         return true;
 932                 } else {
 933                         # If it doesn't exist, it can't be protected
 934                         return false;
 935                 }
 936         }
 937
 938         /**
 939          * Does the title correspond to a protected article?
 940          * @param string $what the action the page is protected from,
 941          * by default checks move and edit
 942          * @return boolean
 943          */
 944         public function isProtected( $action = '' ) {
 945                 global $wgRestrictionLevels, $wgRestrictionTypes;
 946
 947                 # Special pages have inherent protection
 948                 if( $this->getNamespace() == NS_SPECIAL )
 949                         return true;
 950
 951                 # Check regular protection levels
 952                 foreach( $wgRestrictionTypes as $type ){
 953                         if( $action == $type || $action == '' ) {
 954                                 $r = $this->getRestrictions( $type );
 955                                 foreach( $wgRestrictionLevels as $level ) {
 956                                         if( in_array( $level, $r ) && $level != '' ) {
 957                                                 return true;
 958                                         }
 959                                 }
 960                         }
 961                 }
 962
 963                 return false;
 964         }
 965
 966         /**
 967          * Is $wgUser watching this page?
 968          * @return boolean
 969          */
 970         public function userIsWatching() {
 971                 global $wgUser;
 972
 973                 if ( is_null( $this->mWatched ) ) {
 974                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 975                                 $this->mWatched = false;
 976                         } else {
 977                                 $this->mWatched = $wgUser->isWatched( $this );
 978                         }
 979                 }
 980                 return $this->mWatched;
 981         }
 982
 983         /**
 984          * Can $wgUser perform $action on this page?
 985          * This skips potentially expensive cascading permission checks.
 986          *
 987          * Suitable for use for nonessential UI controls in common cases, but
 988          * _not_ for functional access control.
 989          *
 990          * May provide false positives, but should never provide a false negative.
 991          *
 992          * @param string $action action that permission needs to be checked for
 993          * @return boolean
 994          */
 995         public function quickUserCan( $action ) {
 996                 return $this->userCan( $action, false );
 997         }
 998
 999         /**
1000          * Determines if $wgUser is unable to edit this page because it has been protected
1001          * by $wgNamespaceProtection.
1002          *
1003          * @return boolean
1004          */
1005         public function isNamespaceProtected() {
1006                 global $wgNamespaceProtection, $wgUser;
1007                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1008                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1009                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1010                                         return true;
1011                         }
1012                 }
1013                 return false;
1014         }
1015
1016         /**
1017          * Can $wgUser perform $action on this page?
1018          * @param string $action action that permission needs to be checked for
1019          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1020          * @return boolean
1021          */
1022         public function userCan( $action, $doExpensiveQueries = true ) {
1023                 global $wgUser;
1024                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1025         }
1026
1027         /**
1028          * Can $user perform $action on this page?
1029          *
1030          * FIXME: This *does not* check throttles (User::pingLimiter()).
1031          *
1032          * @param string $action action that permission needs to be checked for
1033          * @param User $user user to check
1034          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1035          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1036          */
1037         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1038                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1039
1040                 global $wgContLang;
1041                 global $wgLang;
1042                 global $wgEmailConfirmToEdit;
1043
1044                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1045                         $errors[] = array( 'confirmedittext' );
1046                 }
1047
1048                 if ( $user->isBlockedFrom( $this ) ) {
1049                         $block = $user->mBlock;
1050
1051                         // This is from OutputPage::blockedPage
1052                         // Copied at r23888 by werdna
1053
1054                         $id = $user->blockedBy();
1055                         $reason = $user->blockedFor();
1056                         if( $reason == '' ) {
1057                                 $reason = wfMsg( 'blockednoreason' );
1058                         }
1059                         $ip = wfGetIP();
1060
1061                         if ( is_numeric( $id ) ) {
1062                                 $name = User::whoIs( $id );
1063                         } else {
1064                                 $name = $id;
1065                         }
1066
1067                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1068                         $blockid = $block->mId;
1069                         $blockExpiry = $user->mBlock->mExpiry;
1070                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1071
1072                         if ( $blockExpiry == 'infinity' ) {
1073                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1074                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1075
1076                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1077                                         if ( strpos( $option, ':' ) == false )
1078                                                 continue;
1079
1080                                         list ($show, $value) = explode( ":", $option );
1081
1082                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1083                                                 $blockExpiry = $show;
1084                                                 break;
1085                                         }
1086                                 }
1087                         } else {
1088                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1089                         }
1090
1091                         $intended = $user->mBlock->mAddress;
1092
1093                         $errors[] = array ( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1094                 }
1095
1096                 return $errors;
1097         }
1098
1099         /**
1100          * Can $user perform $action on this page? This is an internal function,
1101          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1102          * checks on wfReadOnly() and blocks)
1103          *
1104          * @param string $action action that permission needs to be checked for
1105          * @param User $user user to check
1106          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1107          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1108          */
1109         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1110                 wfProfileIn( __METHOD__ );
1111
1112                 $errors = array();
1113
1114                 // Use getUserPermissionsErrors instead
1115                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1116                         return $result ? array() : array( array( 'badaccess-group0' ) );
1117                 }
1118
1119                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1120                         if ($result != array() && is_array($result) && !is_array($result[0]))
1121                                 $errors[] = $result; # A single array representing an error
1122                         else if (is_array($result) && is_array($result[0]))
1123                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1124                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1125                                 $errors[] = array($result); # A string representing a message-id
1126                         else if ($result === false )
1127                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1128                 }
1129                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1130                         if ($result != array() && is_array($result) && !is_array($result[0]))
1131                                 $errors[] = $result; # A single array representing an error
1132                         else if (is_array($result) && is_array($result[0]))
1133                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1134                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1135                                 $errors[] = array($result); # A string representing a message-id
1136                         else if ($result === false )
1137                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1138                 }
1139
1140                 if( NS_SPECIAL == $this->mNamespace ) {
1141                         $errors[] = array('ns-specialprotected');
1142                 }
1143
1144                 if ( $this->isNamespaceProtected() ) {
1145                         $ns = $this->getNamespace() == NS_MAIN
1146                                 ? wfMsg( 'nstab-main' )
1147                                 : $this->getNsText();
1148                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1149                                 ? array('protectedinterface')
1150                                 : array( 'namespaceprotected',  $ns ) );
1151                 }
1152
1153                 if( $this->mDbkeyform == '_' ) {
1154                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1155                         $errors[] = array('badaccess-group0');
1156                 }
1157
1158                 # protect css/js subpages of user pages
1159                 # XXX: this might be better using restrictions
1160                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1161                 if( $this->isCssJsSubpage()
1162                         && !$user->isAllowed('editusercssjs')
1163                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1164                         $errors[] = array('customcssjsprotected');
1165                 }
1166
1167                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1168                         # We /could/ use the protection level on the source page, but it's fairly ugly
1169                         #  as we have to establish a precedence hierarchy for pages included by multiple
1170                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1171                         #  as they could remove the protection anyway.
1172                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1173                         # Cascading protection depends on more than this page...
1174                         # Several cascading protected pages may include this page...
1175                         # Check each cascading level
1176                         # This is only for protection restrictions, not for all actions
1177                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1178                                 foreach( $restrictions[$action] as $right ) {
1179                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1180                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1181                                                 $pages = '';
1182                                                 foreach( $cascadingSources as $page )
1183                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1184                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1185                                         }
1186                                 }
1187                         }
1188                 }
1189
1190                 foreach( $this->getRestrictions($action) as $right ) {
1191                         // Backwards compatibility, rewrite sysop -> protect
1192                         if ( $right == 'sysop' ) {
1193                                 $right = 'protect';
1194                         }
1195                         if( '' != $right && !$user->isAllowed( $right ) ) {
1196                                 //Users with 'editprotected' permission can edit protected pages
1197                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1198                                         //Users with 'editprotected' permission cannot edit protected pages
1199                                         //with cascading option turned on.
1200                                         if($this->mCascadeRestriction) {
1201                                                 $errors[] = array( 'protectedpagetext', $right );
1202                                         } else {
1203                                                 //Nothing, user can edit!
1204                                         }
1205                                 } else {
1206                                         $errors[] = array( 'protectedpagetext', $right );
1207                                 }
1208                         }
1209                 }
1210
1211                 if ($action == 'protect') {
1212                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1213                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1214                         }
1215                 }
1216
1217                 if ($action == 'create') {
1218                         $title_protection = $this->getTitleProtection();
1219
1220                         if (is_array($title_protection)) {
1221                                 extract($title_protection);
1222
1223                                 if ($pt_create_perm == 'sysop')
1224                                         $pt_create_perm = 'protect';
1225
1226                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1227                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1228                                 }
1229                         }
1230
1231                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1232                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1233                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1234                         }
1235                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1236                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1237                 } elseif ( !$user->isAllowed( $action ) ) {
1238                         $return = null;
1239                         $groups = array();
1240                         global $wgGroupPermissions;
1241                         foreach( $wgGroupPermissions as $key => $value ) {
1242                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1243                                         $groupName = User::getGroupName( $key );
1244                                         $groupPage = User::getGroupPage( $key );
1245                                         if( $groupPage ) {
1246                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1247                                         } else {
1248                                                 $groups[] = $groupName;
1249                                         }
1250                                 }
1251                         }
1252                         $n = count( $groups );
1253                         $groups = implode( ', ', $groups );
1254                         switch( $n ) {
1255                                 case 0:
1256                                 case 1:
1257                                 case 2:
1258                                         $return = array( "badaccess-group$n", $groups );
1259                                         break;
1260                                 default:
1261                                         $return = array( 'badaccess-groups', $groups );
1262                         }
1263                         $errors[] = $return;
1264                 }
1265
1266                 wfProfileOut( __METHOD__ );
1267                 return $errors;
1268         }
1269
1270         /**
1271          * Is this title subject to title protection?
1272          * @return mixed An associative array representing any existent title
1273          *   protection, or false if there's none.
1274          */
1275         private function getTitleProtection() {
1276                 // Can't protect pages in special namespaces
1277                 if ( $this->getNamespace() < 0 ) {
1278                         return false;
1279                 }
1280
1281                 $dbr = wfGetDB( DB_SLAVE );
1282                 $res = $dbr->select( 'protected_titles', '*',
1283                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1284
1285                 if ($row = $dbr->fetchRow( $res )) {
1286                         return $row;
1287                 } else {
1288                         return false;
1289                 }
1290         }
1291
1292         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1293                 global $wgGroupPermissions,$wgUser,$wgContLang;
1294
1295                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1296                         && $expiry == $this->mRestrictionsExpiry) {
1297                         // No change
1298                         return true;
1299                 }
1300
1301                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1302
1303                 $dbw = wfGetDB( DB_MASTER );
1304
1305                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1306
1307                 $expiry_description = '';
1308                 if ( $encodedExpiry != 'infinity' ) {
1309                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1310                 }
1311
1312                 # Update protection table
1313                 if ($create_perm != '' ) {
1314                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1315                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1316                                         , 'pt_create_perm' => $create_perm
1317                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1318                                         , 'pt_expiry' => $encodedExpiry
1319                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1320                 } else {
1321                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1322                                 'pt_title' => $title ), __METHOD__ );
1323                 }
1324                 # Update the protection log
1325                 $log = new LogPage( 'protect' );
1326
1327                 if( $create_perm ) {
1328                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1329                 } else {
1330                         $log->addEntry( 'unprotect', $this, $reason );
1331                 }
1332
1333                 return true;
1334         }
1335
1336         /**
1337          * Remove any title protection (due to page existing
1338          */
1339         public function deleteTitleProtection() {
1340                 $dbw = wfGetDB( DB_MASTER );
1341
1342                 $dbw->delete( 'protected_titles',
1343                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1344         }
1345
1346         /**
1347          * Can $wgUser edit this page?
1348          * @return boolean
1349          * @deprecated use userCan('edit')
1350          */
1351         public function userCanEdit( $doExpensiveQueries = true ) {
1352                 return $this->userCan( 'edit', $doExpensiveQueries );
1353         }
1354
1355         /**
1356          * Can $wgUser create this page?
1357          * @return boolean
1358          * @deprecated use userCan('create')
1359          */
1360         public function userCanCreate( $doExpensiveQueries = true ) {
1361                 return $this->userCan( 'create', $doExpensiveQueries );
1362         }
1363
1364         /**
1365          * Can $wgUser move this page?
1366          * @return boolean
1367          * @deprecated use userCan('move')
1368          */
1369         public function userCanMove( $doExpensiveQueries = true ) {
1370                 return $this->userCan( 'move', $doExpensiveQueries );
1371         }
1372
1373         /**
1374          * Would anybody with sufficient privileges be able to move this page?
1375          * Some pages just aren't movable.
1376          *
1377          * @return boolean
1378          */
1379         public function isMovable() {
1380                 return MWNamespace::isMovable( $this->getNamespace() )
1381                         && $this->getInterwiki() == '';
1382         }
1383
1384         /**
1385          * Can $wgUser read this page?
1386          * @return boolean
1387          * @todo fold these checks into userCan()
1388          */
1389         public function userCanRead() {
1390                 global $wgUser, $wgGroupPermissions;
1391
1392                 $result = null;
1393                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1394                 if ( $result !== null ) {
1395                         return $result;
1396                 }
1397
1398                 # Shortcut for public wikis, allows skipping quite a bit of code
1399                 if ($wgGroupPermissions['*']['read'])
1400                         return true;
1401
1402                 if( $wgUser->isAllowed( 'read' ) ) {
1403                         return true;
1404                 } else {
1405                         global $wgWhitelistRead;
1406
1407                         /**
1408                          * Always grant access to the login page.
1409                          * Even anons need to be able to log in.
1410                         */
1411                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1412                                 return true;
1413                         }
1414
1415                         /**
1416                          * Bail out if there isn't whitelist
1417                          */
1418                         if( !is_array($wgWhitelistRead) ) {
1419                                 return false;
1420                         }
1421
1422                         /**
1423                          * Check for explicit whitelisting
1424                          */
1425                         $name = $this->getPrefixedText();
1426                         if( in_array( $name, $wgWhitelistRead, true ) )
1427                                 return true;
1428
1429                         /**
1430                          * Old settings might have the title prefixed with
1431                          * a colon for main-namespace pages
1432                          */
1433                         if( $this->getNamespace() == NS_MAIN ) {
1434                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1435                                         return true;
1436                         }
1437
1438                         /**
1439                          * If it's a special page, ditch the subpage bit
1440                          * and check again
1441                          */
1442                         if( $this->getNamespace() == NS_SPECIAL ) {
1443                                 $name = $this->getDBkey();
1444                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1445                                 if ( $name === false ) {
1446                                         # Invalid special page, but we show standard login required message
1447                                         return false;
1448                                 }
1449
1450                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1451                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1452                                         return true;
1453                         }
1454
1455                 }
1456                 return false;
1457         }
1458
1459         /**
1460          * Is this a talk page of some sort?
1461          * @return bool
1462          */
1463         public function isTalkPage() {
1464                 return MWNamespace::isTalk( $this->getNamespace() );
1465         }
1466
1467         /**
1468          * Is this a subpage?
1469          * @return bool
1470          */
1471         public function isSubpage() {
1472                 global $wgNamespacesWithSubpages;
1473
1474                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1475                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1476                 } else {
1477                         return false;
1478                 }
1479         }
1480
1481         /**
1482          * Could this page contain custom CSS or JavaScript, based
1483          * on the title?
1484          *
1485          * @return bool
1486          */
1487         public function isCssOrJsPage() {
1488                 return $this->mNamespace == NS_MEDIAWIKI
1489                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1490         }
1491
1492         /**
1493          * Is this a .css or .js subpage of a user page?
1494          * @return bool
1495          */
1496         public function isCssJsSubpage() {
1497                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1498         }
1499         /**
1500          * Is this a *valid* .css or .js subpage of a user page?
1501          * Check that the corresponding skin exists
1502          */
1503         public function isValidCssJsSubpage() {
1504                 if ( $this->isCssJsSubpage() ) {
1505                         $skinNames = Skin::getSkinNames();
1506                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1507                 } else {
1508                         return false;
1509                 }
1510         }
1511         /**
1512          * Trim down a .css or .js subpage title to get the corresponding skin name
1513          */
1514         public function getSkinFromCssJsSubpage() {
1515                 $subpage = explode( '/', $this->mTextform );
1516                 $subpage = $subpage[ count( $subpage ) - 1 ];
1517                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1518         }
1519         /**
1520          * Is this a .css subpage of a user page?
1521          * @return bool
1522          */
1523         public function isCssSubpage() {
1524                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1525         }
1526         /**
1527          * Is this a .js subpage of a user page?
1528          * @return bool
1529          */
1530         public function isJsSubpage() {
1531                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1532         }
1533         /**
1534          * Protect css/js subpages of user pages: can $wgUser edit
1535          * this page?
1536          *
1537          * @return boolean
1538          * @todo XXX: this might be better using restrictions
1539          */
1540         public function userCanEditCssJsSubpage() {
1541                 global $wgUser;
1542                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1543         }
1544
1545         /**
1546          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1547          *
1548          * @return bool If the page is subject to cascading restrictions.
1549          */
1550         public function isCascadeProtected() {
1551                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1552                 return ( $sources > 0 );
1553         }
1554
1555         /**
1556          * Cascading protection: Get the source of any cascading restrictions on this page.
1557          *
1558          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1559          * @return array( mixed title array, restriction array)
1560          * 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.
1561          * The restriction array is an array of each type, each of which contains an array of unique groups
1562          */
1563         public function getCascadeProtectionSources( $get_pages = true ) {
1564                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1565
1566                 # Define our dimension of restrictions types
1567                 $pagerestrictions = array();
1568                 foreach( $wgRestrictionTypes as $action )
1569                         $pagerestrictions[$action] = array();
1570
1571                 if (!$wgEnableCascadingProtection)
1572                         return array( false, $pagerestrictions );
1573
1574                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1575                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1576                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1577                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1578                 }
1579
1580                 wfProfileIn( __METHOD__ );
1581
1582                 $dbr = wfGetDb( DB_SLAVE );
1583
1584                 if ( $this->getNamespace() == NS_IMAGE ) {
1585                         $tables = array ('imagelinks', 'page_restrictions');
1586                         $where_clauses = array(
1587                                 'il_to' => $this->getDBkey(),
1588                                 'il_from=pr_page',
1589                                 'pr_cascade' => 1 );
1590                 } else {
1591                         $tables = array ('templatelinks', 'page_restrictions');
1592                         $where_clauses = array(
1593                                 'tl_namespace' => $this->getNamespace(),
1594                                 'tl_title' => $this->getDBkey(),
1595                                 'tl_from=pr_page',
1596                                 'pr_cascade' => 1 );
1597                 }
1598
1599                 if ( $get_pages ) {
1600                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1601                         $where_clauses[] = 'page_id=pr_page';
1602                         $tables[] = 'page';
1603                 } else {
1604                         $cols = array( 'pr_expiry' );
1605                 }
1606
1607                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1608
1609                 $sources = $get_pages ? array() : false;
1610                 $now = wfTimestampNow();
1611                 $purgeExpired = false;
1612
1613                 while( $row = $dbr->fetchObject( $res ) ) {
1614                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1615                         if( $expiry > $now ) {
1616                                 if ($get_pages) {
1617                                         $page_id = $row->pr_page;
1618                                         $page_ns = $row->page_namespace;
1619                                         $page_title = $row->page_title;
1620                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1621                                         # Add groups needed for each restriction type if its not already there
1622                                         # Make sure this restriction type still exists
1623                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1624                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1625                                         }
1626                                 } else {
1627                                         $sources = true;
1628                                 }
1629                         } else {
1630                                 // Trigger lazy purge of expired restrictions from the db
1631                                 $purgeExpired = true;
1632                         }
1633                 }
1634                 if( $purgeExpired ) {
1635                         Title::purgeExpiredRestrictions();
1636                 }
1637
1638                 wfProfileOut( __METHOD__ );
1639
1640                 if ( $get_pages ) {
1641                         $this->mCascadeSources = $sources;
1642                         $this->mCascadingRestrictions = $pagerestrictions;
1643                 } else {
1644                         $this->mHasCascadingRestrictions = $sources;
1645                 }
1646
1647                 return array( $sources, $pagerestrictions );
1648         }
1649
1650         function areRestrictionsCascading() {
1651                 if (!$this->mRestrictionsLoaded) {
1652                         $this->loadRestrictions();
1653                 }
1654
1655                 return $this->mCascadeRestriction;
1656         }
1657
1658         /**
1659          * Loads a string into mRestrictions array
1660          * @param resource $res restrictions as an SQL result.
1661          */
1662         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1663                 global $wgRestrictionTypes;
1664                 $dbr = wfGetDB( DB_SLAVE );
1665
1666                 foreach( $wgRestrictionTypes as $type ){
1667                         $this->mRestrictions[$type] = array();
1668                 }
1669
1670                 $this->mCascadeRestriction = false;
1671                 $this->mRestrictionsExpiry = Block::decodeExpiry('');
1672
1673                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1674
1675                 if ( $oldFashionedRestrictions == NULL ) {
1676                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1677                 }
1678
1679                 if ($oldFashionedRestrictions != '') {
1680
1681                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1682                                 $temp = explode( '=', trim( $restrict ) );
1683                                 if(count($temp) == 1) {
1684                                         // old old format should be treated as edit/move restriction
1685                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1686                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1687                                 } else {
1688                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1689                                 }
1690                         }
1691
1692                         $this->mOldRestrictions = true;
1693
1694                 }
1695
1696                 if( $dbr->numRows( $res ) ) {
1697                         # Current system - load second to make them override.
1698                         $now = wfTimestampNow();
1699                         $purgeExpired = false;
1700
1701                         while ($row = $dbr->fetchObject( $res ) ) {
1702                                 # Cycle through all the restrictions.
1703
1704                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1705                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1706                                         continue;
1707
1708                                 // This code should be refactored, now that it's being used more generally,
1709                                 // But I don't really see any harm in leaving it in Block for now -werdna
1710                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1711
1712                                 // Only apply the restrictions if they haven't expired!
1713                                 if ( !$expiry || $expiry > $now ) {
1714                                         $this->mRestrictionsExpiry = $expiry;
1715                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1716
1717                                         $this->mCascadeRestriction |= $row->pr_cascade;
1718                                 } else {
1719                                         // Trigger a lazy purge of expired restrictions
1720                                         $purgeExpired = true;
1721                                 }
1722                         }
1723
1724                         if( $purgeExpired ) {
1725                                 Title::purgeExpiredRestrictions();
1726                         }
1727                 }
1728
1729                 $this->mRestrictionsLoaded = true;
1730         }
1731
1732         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1733                 if( !$this->mRestrictionsLoaded ) {
1734                         if ($this->exists()) {
1735                                 $dbr = wfGetDB( DB_SLAVE );
1736
1737                                 $res = $dbr->select( 'page_restrictions', '*',
1738                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1739
1740                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1741                         } else {
1742                                 $title_protection = $this->getTitleProtection();
1743
1744                                 if (is_array($title_protection)) {
1745                                         extract($title_protection);
1746
1747                                         $now = wfTimestampNow();
1748                                         $expiry = Block::decodeExpiry($pt_expiry);
1749
1750                                         if (!$expiry || $expiry > $now) {
1751                                                 // Apply the restrictions
1752                                                 $this->mRestrictionsExpiry = $expiry;
1753                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1754                                         } else { // Get rid of the old restrictions
1755                                                 Title::purgeExpiredRestrictions();
1756                                         }
1757                                 }
1758                                 $this->mRestrictionsLoaded = true;
1759                         }
1760                 }
1761         }
1762
1763         /**
1764          * Purge expired restrictions from the page_restrictions table
1765          */
1766         static function purgeExpiredRestrictions() {
1767                 $dbw = wfGetDB( DB_MASTER );
1768                 $dbw->delete( 'page_restrictions',
1769                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1770                         __METHOD__ );
1771
1772                 $dbw->delete( 'protected_titles',
1773                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1774                         __METHOD__ );
1775         }
1776
1777         /**
1778          * Accessor/initialisation for mRestrictions
1779          *
1780          * @param string $action action that permission needs to be checked for
1781          * @return array the array of groups allowed to edit this article
1782          */
1783         public function getRestrictions( $action ) {
1784                 if( !$this->mRestrictionsLoaded ) {
1785                         $this->loadRestrictions();
1786                 }
1787                 return isset( $this->mRestrictions[$action] )
1788                                 ? $this->mRestrictions[$action]
1789                                 : array();
1790         }
1791
1792         /**
1793          * Is there a version of this page in the deletion archive?
1794          * @return int the number of archived revisions
1795          */
1796         public function isDeleted() {
1797                 $fname = 'Title::isDeleted';
1798                 if ( $this->getNamespace() < 0 ) {
1799                         $n = 0;
1800                 } else {
1801                         $dbr = wfGetDB( DB_SLAVE );
1802                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1803                                 'ar_title' => $this->getDBkey() ), $fname );
1804                         if( $this->getNamespace() == NS_IMAGE ) {
1805                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1806                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1807                         }
1808                 }
1809                 return (int)$n;
1810         }
1811
1812         /**
1813          * Get the article ID for this Title from the link cache,
1814          * adding it if necessary
1815          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1816          *      for update
1817          * @return int the ID
1818          */
1819         public function getArticleID( $flags = 0 ) {
1820                 $linkCache =& LinkCache::singleton();
1821                 if ( $flags & GAID_FOR_UPDATE ) {
1822                         $oldUpdate = $linkCache->forUpdate( true );
1823                         $this->mArticleID = $linkCache->addLinkObj( $this );
1824                         $linkCache->forUpdate( $oldUpdate );
1825                 } else {
1826                         if ( -1 == $this->mArticleID ) {
1827                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1828                         }
1829                 }
1830                 return $this->mArticleID;
1831         }
1832
1833         public function getLatestRevID() {
1834                 if ($this->mLatestID !== false)
1835                         return $this->mLatestID;
1836
1837                 $db = wfGetDB(DB_SLAVE);
1838                 return $this->mLatestID = $db->selectField( 'revision',
1839                         "max(rev_id)",
1840                         array('rev_page' => $this->getArticleID()),
1841                         'Title::getLatestRevID' );
1842         }
1843
1844         /**
1845          * This clears some fields in this object, and clears any associated
1846          * keys in the "bad links" section of the link cache.
1847          *
1848          * - This is called from Article::insertNewArticle() to allow
1849          * loading of the new page_id. It's also called from
1850          * Article::doDeleteArticle()
1851          *
1852          * @param int $newid the new Article ID
1853          */
1854         public function resetArticleID( $newid ) {
1855                 $linkCache =& LinkCache::singleton();
1856                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1857
1858                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1859                 else { $this->mArticleID = $newid; }
1860                 $this->mRestrictionsLoaded = false;
1861                 $this->mRestrictions = array();
1862         }
1863
1864         /**
1865          * Updates page_touched for this page; called from LinksUpdate.php
1866          * @return bool true if the update succeded
1867          */
1868         public function invalidateCache() {
1869                 global $wgUseFileCache;
1870
1871                 if ( wfReadOnly() ) {
1872                         return;
1873                 }
1874
1875                 $dbw = wfGetDB( DB_MASTER );
1876                 $success = $dbw->update( 'page',
1877                         array( /* SET */
1878                                 'page_touched' => $dbw->timestamp()
1879                         ), array( /* WHERE */
1880                                 'page_namespace' => $this->getNamespace() ,
1881                                 'page_title' => $this->getDBkey()
1882                         ), 'Title::invalidateCache'
1883                 );
1884
1885                 if ($wgUseFileCache) {
1886                         $cache = new HTMLFileCache($this);
1887                         @unlink($cache->fileCacheName());
1888                 }
1889
1890                 return $success;
1891         }
1892
1893         /**
1894          * Prefix some arbitrary text with the namespace or interwiki prefix
1895          * of this object
1896          *
1897          * @param string $name the text
1898          * @return string the prefixed text
1899          * @private
1900          */
1901         /* private */ function prefix( $name ) {
1902                 $p = '';
1903                 if ( '' != $this->mInterwiki ) {
1904                         $p = $this->mInterwiki . ':';
1905                 }
1906                 if ( 0 != $this->mNamespace ) {
1907                         $p .= $this->getNsText() . ':';
1908                 }
1909                 return $p . $name;
1910         }
1911
1912         /**
1913          * Secure and split - main initialisation function for this object
1914          *
1915          * Assumes that mDbkeyform has been set, and is urldecoded
1916          * and uses underscores, but not otherwise munged.  This function
1917          * removes illegal characters, splits off the interwiki and
1918          * namespace prefixes, sets the other forms, and canonicalizes
1919          * everything.
1920          * @return bool true on success
1921          */
1922         private function secureAndSplit() {
1923                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1924
1925                 # Initialisation
1926                 static $rxTc = false;
1927                 if( !$rxTc ) {
1928                         # Matching titles will be held as illegal.
1929                         $rxTc = '/' .
1930                                 # Any character not allowed is forbidden...
1931                                 '[^' . Title::legalChars() . ']' .
1932                                 # URL percent encoding sequences interfere with the ability
1933                                 # to round-trip titles -- you can't link to them consistently.
1934                                 '|%[0-9A-Fa-f]{2}' .
1935                                 # XML/HTML character references produce similar issues.
1936                                 '|&[A-Za-z0-9\x80-\xff]+;' .
1937                                 '|&#[0-9]+;' .
1938                                 '|&#x[0-9A-Fa-f]+;' .
1939                                 '/S';
1940                 }
1941
1942                 $this->mInterwiki = $this->mFragment = '';
1943                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1944
1945                 $dbkey = $this->mDbkeyform;
1946
1947                 # Strip Unicode bidi override characters.
1948                 # Sometimes they slip into cut-n-pasted page titles, where the
1949                 # override chars get included in list displays.
1950                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1951                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1952
1953                 # Clean up whitespace
1954                 #
1955                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1956                 $dbkey = trim( $dbkey, '_' );
1957
1958                 if ( '' == $dbkey ) {
1959                         return false;
1960                 }
1961
1962                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1963                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1964                         return false;
1965                 }
1966
1967                 $this->mDbkeyform = $dbkey;
1968
1969                 # Initial colon indicates main namespace rather than specified default
1970                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1971                 if ( ':' == $dbkey{0} ) {
1972                         $this->mNamespace = NS_MAIN;
1973                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1974                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
1975                 }
1976
1977                 # Namespace or interwiki prefix
1978                 $firstPass = true;
1979                 do {
1980                         $m = array();
1981                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1982                                 $p = $m[1];
1983                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
1984                                         # Ordinary namespace
1985                                         $dbkey = $m[2];
1986                                         $this->mNamespace = $ns;
1987                                 } elseif( $this->getInterwikiLink( $p ) ) {
1988                                         if( !$firstPass ) {
1989                                                 # Can't make a local interwiki link to an interwiki link.
1990                                                 # That's just crazy!
1991                                                 return false;
1992                                         }
1993
1994                                         # Interwiki link
1995                                         $dbkey = $m[2];
1996                                         $this->mInterwiki = $wgContLang->lc( $p );
1997
1998                                         # Redundant interwiki prefix to the local wiki
1999                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2000                                                 if( $dbkey == '' ) {
2001                                                         # Can't have an empty self-link
2002                                                         return false;
2003                                                 }
2004                                                 $this->mInterwiki = '';
2005                                                 $firstPass = false;
2006                                                 # Do another namespace split...
2007                                                 continue;
2008                                         }
2009
2010                                         # If there's an initial colon after the interwiki, that also
2011                                         # resets the default namespace
2012                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2013                                                 $this->mNamespace = NS_MAIN;
2014                                                 $dbkey = substr( $dbkey, 1 );
2015                                         }
2016                                 }
2017                                 # If there's no recognized interwiki or namespace,
2018                                 # then let the colon expression be part of the title.
2019                         }
2020                         break;
2021                 } while( true );
2022
2023                 # We already know that some pages won't be in the database!
2024                 #
2025                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2026                         $this->mArticleID = 0;
2027                 }
2028                 $fragment = strstr( $dbkey, '#' );
2029                 if ( false !== $fragment ) {
2030                         $this->setFragment( $fragment );
2031                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2032                         # remove whitespace again: prevents "Foo_bar_#"
2033                         # becoming "Foo_bar_"
2034                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2035                 }
2036
2037                 # Reject illegal characters.
2038                 #
2039                 if( preg_match( $rxTc, $dbkey ) ) {
2040                         return false;
2041                 }
2042
2043                 /**
2044                  * Pages with "/./" or "/../" appearing in the URLs will
2045                  * often be unreachable due to the way web browsers deal
2046                  * with 'relative' URLs. Forbid them explicitly.
2047                  */
2048                 if ( strpos( $dbkey, '.' ) !== false &&
2049                      ( $dbkey === '.' || $dbkey === '..' ||
2050                        strpos( $dbkey, './' ) === 0  ||
2051                        strpos( $dbkey, '../' ) === 0 ||
2052                        strpos( $dbkey, '/./' ) !== false ||
2053                        strpos( $dbkey, '/../' ) !== false  ||
2054                        substr( $dbkey, -2 ) == '/.' ||
2055                        substr( $dbkey, -3 ) == '/..' ) )
2056                 {
2057                         return false;
2058                 }
2059
2060                 /**
2061                  * Magic tilde sequences? Nu-uh!
2062                  */
2063                 if( strpos( $dbkey, '~~~' ) !== false ) {
2064                         return false;
2065                 }
2066
2067                 /**
2068                  * Limit the size of titles to 255 bytes.
2069                  * This is typically the size of the underlying database field.
2070                  * We make an exception for special pages, which don't need to be stored
2071                  * in the database, and may edge over 255 bytes due to subpage syntax
2072                  * for long titles, e.g. [[Special:Block/Long name]]
2073                  */
2074                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2075                   strlen( $dbkey ) > 512 )
2076                 {
2077                         return false;
2078                 }
2079
2080                 /**
2081                  * Normally, all wiki links are forced to have
2082                  * an initial capital letter so [[foo]] and [[Foo]]
2083                  * point to the same place.
2084                  *
2085                  * Don't force it for interwikis, since the other
2086                  * site might be case-sensitive.
2087                  */
2088                 $this->mUserCaseDBKey = $dbkey;
2089                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2090                         $dbkey = $wgContLang->ucfirst( $dbkey );
2091                 }
2092
2093                 /**
2094                  * Can't make a link to a namespace alone...
2095                  * "empty" local links can only be self-links
2096                  * with a fragment identifier.
2097                  */
2098                 if( $dbkey == '' &&
2099                         $this->mInterwiki == '' &&
2100                         $this->mNamespace != NS_MAIN ) {
2101                         return false;
2102                 }
2103                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2104                 // IP names are not allowed for accounts, and can only be referring to
2105                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2106                 // there are numerous ways to present the same IP. Having sp:contribs scan
2107                 // them all is silly and having some show the edits and others not is
2108                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2109                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2110                         IP::sanitizeIP( $dbkey ) : $dbkey;
2111                 // Any remaining initial :s are illegal.
2112                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2113                         return false;
2114                 }
2115
2116                 # Fill fields
2117                 $this->mDbkeyform = $dbkey;
2118                 $this->mUrlform = wfUrlencode( $dbkey );
2119
2120                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2121
2122                 return true;
2123         }
2124
2125         /**
2126          * Set the fragment for this title
2127          * This is kind of bad, since except for this rarely-used function, Title objects
2128          * are immutable. The reason this is here is because it's better than setting the
2129          * members directly, which is what Linker::formatComment was doing previously.
2130          *
2131          * @param string $fragment text
2132          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2133          */
2134         public function setFragment( $fragment ) {
2135                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2136         }
2137
2138         /**
2139          * Get a Title object associated with the talk page of this article
2140          * @return Title the object for the talk page
2141          */
2142         public function getTalkPage() {
2143                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2144         }
2145
2146         /**
2147          * Get a title object associated with the subject page of this
2148          * talk page
2149          *
2150          * @return Title the object for the subject page
2151          */
2152         public function getSubjectPage() {
2153                 return Title::makeTitle( MWNamespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2154         }
2155
2156         /**
2157          * Get an array of Title objects linking to this Title
2158          * Also stores the IDs in the link cache.
2159          *
2160          * WARNING: do not use this function on arbitrary user-supplied titles!
2161          * On heavily-used templates it will max out the memory.
2162          *
2163          * @param string $options may be FOR UPDATE
2164          * @return array the Title objects linking here
2165          */
2166         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2167                 $linkCache =& LinkCache::singleton();
2168
2169                 if ( $options ) {
2170                         $db = wfGetDB( DB_MASTER );
2171                 } else {
2172                         $db = wfGetDB( DB_SLAVE );
2173                 }
2174
2175                 $res = $db->select( array( 'page', $table ),
2176                         array( 'page_namespace', 'page_title', 'page_id' ),
2177                         array(
2178                                 "{$prefix}_from=page_id",
2179                                 "{$prefix}_namespace" => $this->getNamespace(),
2180                                 "{$prefix}_title"     => $this->getDBkey() ),
2181                         'Title::getLinksTo',
2182                         $options );
2183
2184                 $retVal = array();
2185                 if ( $db->numRows( $res ) ) {
2186                         while ( $row = $db->fetchObject( $res ) ) {
2187                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2188                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
2189                                         $retVal[] = $titleObj;
2190                                 }
2191                         }
2192                 }
2193                 $db->freeResult( $res );
2194                 return $retVal;
2195         }
2196
2197         /**
2198          * Get an array of Title objects using this Title as a template
2199          * Also stores the IDs in the link cache.
2200          *
2201          * WARNING: do not use this function on arbitrary user-supplied titles!
2202          * On heavily-used templates it will max out the memory.
2203          *
2204          * @param string $options may be FOR UPDATE
2205          * @return array the Title objects linking here
2206          */
2207         public function getTemplateLinksTo( $options = '' ) {
2208                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2209         }
2210
2211         /**
2212          * Get an array of Title objects referring to non-existent articles linked from this page
2213          *
2214          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2215          * @param string $options may be FOR UPDATE
2216          * @return array the Title objects
2217          */
2218         public function getBrokenLinksFrom( $options = '' ) {
2219                 if ( $this->getArticleId() == 0 ) {
2220                         # All links from article ID 0 are false positives
2221                         return array();
2222                 }
2223
2224                 if ( $options ) {
2225                         $db = wfGetDB( DB_MASTER );
2226                 } else {
2227                         $db = wfGetDB( DB_SLAVE );
2228                 }
2229
2230                 $res = $db->safeQuery(
2231                           "SELECT pl_namespace, pl_title
2232                              FROM !
2233                         LEFT JOIN !
2234                                ON pl_namespace=page_namespace
2235                               AND pl_title=page_title
2236                             WHERE pl_from=?
2237                               AND page_namespace IS NULL
2238                                   !",
2239                         $db->tableName( 'pagelinks' ),
2240                         $db->tableName( 'page' ),
2241                         $this->getArticleId(),
2242                         $options );
2243
2244                 $retVal = array();
2245                 if ( $db->numRows( $res ) ) {
2246                         while ( $row = $db->fetchObject( $res ) ) {
2247                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2248                         }
2249                 }
2250                 $db->freeResult( $res );
2251                 return $retVal;
2252         }
2253
2254
2255         /**
2256          * Get a list of URLs to purge from the Squid cache when this
2257          * page changes
2258          *
2259          * @return array the URLs
2260          */
2261         public function getSquidURLs() {
2262                 global $wgContLang;
2263
2264                 $urls = array(
2265                         $this->getInternalURL(),
2266                         $this->getInternalURL( 'action=history' )
2267                 );
2268
2269                 // purge variant urls as well
2270                 if($wgContLang->hasVariants()){
2271                         $variants = $wgContLang->getVariants();
2272                         foreach($variants as $vCode){
2273                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2274                                 $urls[] = $this->getInternalURL('',$vCode);
2275                         }
2276                 }
2277
2278                 return $urls;
2279         }
2280
2281         public function purgeSquid() {
2282                 global $wgUseSquid;
2283                 if ( $wgUseSquid ) {
2284                         $urls = $this->getSquidURLs();
2285                         $u = new SquidUpdate( $urls );
2286                         $u->doUpdate();
2287                 }
2288         }
2289
2290         /**
2291          * Move this page without authentication
2292          * @param Title &$nt the new page Title
2293          */
2294         public function moveNoAuth( &$nt ) {
2295                 return $this->moveTo( $nt, false );
2296         }
2297
2298         /**
2299          * Check whether a given move operation would be valid.
2300          * Returns true if ok, or a message key string for an error message
2301          * if invalid. (Scarrrrry ugly interface this.)
2302          * @param Title &$nt the new title
2303          * @param bool $auth indicates whether $wgUser's permissions
2304          *      should be checked
2305          * @return mixed true on success, message name on failure
2306          */
2307         public function isValidMoveOperation( &$nt, $auth = true ) {
2308                 if( !$this or !$nt ) {
2309                         return 'badtitletext';
2310                 }
2311                 if( $this->equals( $nt ) ) {
2312                         return 'selfmove';
2313                 }
2314                 if( !$this->isMovable() || !$nt->isMovable() ) {
2315                         return 'immobile_namespace';
2316                 }
2317
2318                 $oldid = $this->getArticleID();
2319                 $newid = $nt->getArticleID();
2320
2321                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2322                         return 'articleexists';
2323                 }
2324                 if ( ( '' == $this->getDBkey() ) ||
2325                          ( !$oldid ) ||
2326                      ( '' == $nt->getDBkey() ) ) {
2327                         return 'badarticleerror';
2328                 }
2329
2330                 if ( $auth ) {
2331                         global $wgUser;
2332                         $errors = array_merge($this->getUserPermissionsErrors('move', $wgUser),
2333                                         $this->getUserPermissionsErrors('edit', $wgUser),
2334                                         $nt->getUserPermissionsErrors('move', $wgUser),
2335                                         $nt->getUserPermissionsErrors('edit', $wgUser));
2336                         if($errors !== array())
2337                                 return $errors[0][0];
2338                 }
2339
2340                 global $wgUser;
2341                 $err = null;
2342                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2343                         return 'hookaborted';
2344                 }
2345
2346                 # The move is allowed only if (1) the target doesn't exist, or
2347                 # (2) the target is a redirect to the source, and has no history
2348                 # (so we can undo bad moves right after they're done).
2349
2350                 if ( 0 != $newid ) { # Target exists; check for validity
2351                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2352                                 return 'articleexists';
2353                         }
2354                 } else {
2355                         $tp = $nt->getTitleProtection();
2356                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2357                                 return 'cantmove-titleprotected';
2358                         }
2359                 }
2360                 return true;
2361         }
2362
2363         /**
2364          * Move a title to a new location
2365          * @param Title &$nt the new title
2366          * @param bool $auth indicates whether $wgUser's permissions
2367          *      should be checked
2368          * @param string $reason The reason for the move
2369          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2370          *  Ignored if the user doesn't have the suppressredirect right.
2371          * @return mixed true on success, message name on failure
2372          */
2373         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2374                 $err = $this->isValidMoveOperation( $nt, $auth );
2375                 if( is_string( $err ) ) {
2376                         return $err;
2377                 }
2378
2379                 $pageid = $this->getArticleID();
2380                 if( $nt->exists() ) {
2381                         $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2382                         $pageCountChange = ($createRedirect ? 0 : -1);
2383                 } else { # Target didn't exist, do normal move.
2384                         $this->moveToNewTitle( $nt, $reason, $createRedirect );
2385                         $pageCountChange = ($createRedirect ? 1 : 0);
2386                 }
2387                 $redirid = $this->getArticleID();
2388
2389                 // Category memberships include a sort key which may be customized.
2390                 // If it's left as the default (the page title), we need to update
2391                 // the sort key to match the new title.
2392                 //
2393                 // Be careful to avoid resetting cl_timestamp, which may disturb
2394                 // time-based lists on some sites.
2395                 //
2396                 // Warning -- if the sort key is *explicitly* set to the old title,
2397                 // we can't actually distinguish it from a default here, and it'll
2398                 // be set to the new title even though it really shouldn't.
2399                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2400                 $dbw = wfGetDB( DB_MASTER );
2401                 $dbw->update( 'categorylinks',
2402                         array(
2403                                 'cl_sortkey' => $nt->getPrefixedText(),
2404                                 'cl_timestamp=cl_timestamp' ),
2405                         array(
2406                                 'cl_from' => $pageid,
2407                                 'cl_sortkey' => $this->getPrefixedText() ),
2408                         __METHOD__ );
2409
2410                 # Update watchlists
2411
2412                 $oldnamespace = $this->getNamespace() & ~1;
2413                 $newnamespace = $nt->getNamespace() & ~1;
2414                 $oldtitle = $this->getDBkey();
2415                 $newtitle = $nt->getDBkey();
2416
2417                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2418                         WatchedItem::duplicateEntries( $this, $nt );
2419                 }
2420
2421                 # Update search engine
2422                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2423                 $u->doUpdate();
2424                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2425                 $u->doUpdate();
2426
2427                 # Update site_stats
2428                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2429                         # No longer a content page
2430                         # Not viewed, edited, removing
2431                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2432                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2433                         # Now a content page
2434                         # Not viewed, edited, adding
2435                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2436                 } elseif( $pageCountChange ) {
2437                         # Redirect added
2438                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2439                 } else {
2440                         # Nothing special
2441                         $u = false;
2442                 }
2443                 if( $u )
2444                         $u->doUpdate();
2445                 # Update message cache for interface messages
2446                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2447                         global $wgMessageCache;
2448                         $oldarticle = new Article( $this );
2449                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2450                         $newarticle = new Article( $nt );
2451                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2452                 }
2453
2454                 global $wgUser;
2455                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2456                 return true;
2457         }
2458
2459         /**
2460          * Move page to a title which is at present a redirect to the
2461          * source page
2462          *
2463          * @param Title &$nt the page to move to, which should currently
2464          *      be a redirect
2465          * @param string $reason The reason for the move
2466          * @param bool $createRedirect Whether to leave a redirect at the old title.
2467          *  Ignored if the user doesn't have the suppressredirect right
2468          */
2469         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2470                 global $wgUseSquid, $wgUser;
2471                 $fname = 'Title::moveOverExistingRedirect';
2472                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2473
2474                 if ( $reason ) {
2475                         $comment .= ": $reason";
2476                 }
2477
2478                 $now = wfTimestampNow();
2479                 $newid = $nt->getArticleID();
2480                 $oldid = $this->getArticleID();
2481                 $dbw = wfGetDB( DB_MASTER );
2482
2483                 # Delete the old redirect. We don't save it to history since
2484                 # by definition if we've got here it's rather uninteresting.
2485                 # We have to remove it so that the next step doesn't trigger
2486                 # a conflict on the unique namespace+title index...
2487                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2488                 if ( !$dbw->cascadingDeletes() ) {
2489                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2490                         global $wgUseTrackbacks;
2491                         if ($wgUseTrackbacks)
2492                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2493                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2494                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2495                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2496                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2497                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2498                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2499                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2500                 }
2501
2502                 # Save a null revision in the page's history notifying of the move
2503                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2504                 $nullRevId = $nullRevision->insertOn( $dbw );
2505
2506                 # Change the name of the target page:
2507                 $dbw->update( 'page',
2508                         /* SET */ array(
2509                                 'page_touched'   => $dbw->timestamp($now),
2510                                 'page_namespace' => $nt->getNamespace(),
2511                                 'page_title'     => $nt->getDBkey(),
2512                                 'page_latest'    => $nullRevId,
2513                         ),
2514                         /* WHERE */ array( 'page_id' => $oldid ),
2515                         $fname
2516                 );
2517                 $nt->resetArticleID( $oldid );
2518
2519                 # Recreate the redirect, this time in the other direction.
2520                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2521                 {
2522                         $mwRedir = MagicWord::get( 'redirect' );
2523                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2524                         $redirectArticle = new Article( $this );
2525                         $newid = $redirectArticle->insertOn( $dbw );
2526                         $redirectRevision = new Revision( array(
2527                                 'page'    => $newid,
2528                                 'comment' => $comment,
2529                                 'text'    => $redirectText ) );
2530                         $redirectRevision->insertOn( $dbw );
2531                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2532
2533                         # Now, we record the link from the redirect to the new title.
2534                         # It should have no other outgoing links...
2535                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2536                         $dbw->insert( 'pagelinks',
2537                                 array(
2538                                         'pl_from'      => $newid,
2539                                         'pl_namespace' => $nt->getNamespace(),
2540                                         'pl_title'     => $nt->getDBkey() ),
2541                                 $fname );
2542                 } else {
2543                         $this->resetArticleID( 0 );
2544                 }
2545
2546                 # Log the move
2547                 $log = new LogPage( 'move' );
2548                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2549
2550                 # Purge squid
2551                 if ( $wgUseSquid ) {
2552                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2553                         $u = new SquidUpdate( $urls );
2554                         $u->doUpdate();
2555                 }
2556         }
2557
2558         /**
2559          * Move page to non-existing title.
2560          * @param Title &$nt the new Title
2561          * @param string $reason The reason for the move
2562          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2563          *  Ignored if the user doesn't have the suppressredirect right
2564          */
2565         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2566                 global $wgUseSquid, $wgUser;
2567                 $fname = 'MovePageForm::moveToNewTitle';
2568                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2569                 if ( $reason ) {
2570                         $comment .= ": $reason";
2571                 }
2572
2573                 $newid = $nt->getArticleID();
2574                 $oldid = $this->getArticleID();
2575                 $dbw = wfGetDB( DB_MASTER );
2576                 $now = $dbw->timestamp();
2577
2578                 # Save a null revision in the page's history notifying of the move
2579                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2580                 $nullRevId = $nullRevision->insertOn( $dbw );
2581
2582                 # Rename page entry
2583                 $dbw->update( 'page',
2584                         /* SET */ array(
2585                                 'page_touched'   => $now,
2586                                 'page_namespace' => $nt->getNamespace(),
2587                                 'page_title'     => $nt->getDBkey(),
2588                                 'page_latest'    => $nullRevId,
2589                         ),
2590                         /* WHERE */ array( 'page_id' => $oldid ),
2591                         $fname
2592                 );
2593                 $nt->resetArticleID( $oldid );
2594
2595                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2596                 {
2597                         # Insert redirect
2598                         $mwRedir = MagicWord::get( 'redirect' );
2599                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2600                         $redirectArticle = new Article( $this );
2601                         $newid = $redirectArticle->insertOn( $dbw );
2602                         $redirectRevision = new Revision( array(
2603                                 'page'    => $newid,
2604                                 'comment' => $comment,
2605                                 'text'    => $redirectText ) );
2606                         $redirectRevision->insertOn( $dbw );
2607                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2608
2609                         # Record the just-created redirect's linking to the page
2610                         $dbw->insert( 'pagelinks',
2611                                 array(
2612                                         'pl_from'      => $newid,
2613                                         'pl_namespace' => $nt->getNamespace(),
2614                                         'pl_title'     => $nt->getDBkey() ),
2615                                 $fname );
2616                 } else {
2617                         $this->resetArticleID( 0 );
2618                 }
2619
2620                 # Log the move
2621                 $log = new LogPage( 'move' );
2622                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2623
2624                 # Purge caches as per article creation
2625                 Article::onArticleCreate( $nt );
2626
2627                 # Purge old title from squid
2628                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2629                 $this->purgeSquid();
2630         }
2631
2632         /**
2633          * Checks if $this can be moved to a given Title
2634          * - Selects for update, so don't call it unless you mean business
2635          *
2636          * @param Title &$nt the new title to check
2637          */
2638         public function isValidMoveTarget( $nt ) {
2639
2640                 $fname = 'Title::isValidMoveTarget';
2641                 $dbw = wfGetDB( DB_MASTER );
2642
2643                 # Is it a redirect?
2644                 $id  = $nt->getArticleID();
2645                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2646                         array( 'page_is_redirect','old_text','old_flags' ),
2647                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2648                         $fname, 'FOR UPDATE' );
2649
2650                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2651                         # Not a redirect
2652                         wfDebug( __METHOD__ . ": not a redirect\n" );
2653                         return false;
2654                 }
2655                 $text = Revision::getRevisionText( $obj );
2656
2657                 # Does the redirect point to the source?
2658                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2659                 $m = array();
2660                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2661                         $redirTitle = Title::newFromText( $m[1] );
2662                         if( !is_object( $redirTitle ) ||
2663                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2664                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2665                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2666                                 return false;
2667                         }
2668                 } else {
2669                         # Fail safe
2670                         wfDebug( __METHOD__ . ": failsafe\n" );
2671                         return false;
2672                 }
2673
2674                 # Does the article have a history?
2675                 $row = $dbw->selectRow( array( 'page', 'revision'),
2676                         array( 'rev_id' ),
2677                         array( 'page_namespace' => $nt->getNamespace(),
2678                                 'page_title' => $nt->getDBkey(),
2679                                 'page_id=rev_page AND page_latest != rev_id'
2680                         ), $fname, 'FOR UPDATE'
2681                 );
2682
2683                 # Return true if there was no history
2684                 return $row === false;
2685         }
2686
2687         /**
2688          * Can this title be added to a user's watchlist?
2689          *
2690          * @return bool
2691          */
2692         public function isWatchable() {
2693                 return !$this->isExternal()
2694                         && MWNamespace::isWatchable( $this->getNamespace() );
2695         }
2696
2697         /**
2698          * Get categories to which this Title belongs and return an array of
2699          * categories' names.
2700          *
2701          * @return array an array of parents in the form:
2702          *      $parent => $currentarticle
2703          */
2704         public function getParentCategories() {
2705                 global $wgContLang;
2706
2707                 $titlekey = $this->getArticleId();
2708                 $dbr = wfGetDB( DB_SLAVE );
2709                 $categorylinks = $dbr->tableName( 'categorylinks' );
2710
2711                 # NEW SQL
2712                 $sql = "SELECT * FROM $categorylinks"
2713                      ." WHERE cl_from='$titlekey'"
2714                          ." AND cl_from <> '0'"
2715                          ." ORDER BY cl_sortkey";
2716
2717                 $res = $dbr->query ( $sql ) ;
2718
2719                 if($dbr->numRows($res) > 0) {
2720                         while ( $x = $dbr->fetchObject ( $res ) )
2721                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2722                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2723                         $dbr->freeResult ( $res ) ;
2724                 } else {
2725                         $data = array();
2726                 }
2727                 return $data;
2728         }
2729
2730         /**
2731          * Get a tree of parent categories
2732          * @param array $children an array with the children in the keys, to check for circular refs
2733          * @return array
2734          */
2735         public function getParentCategoryTree( $children = array() ) {
2736                 $stack = array();
2737                 $parents = $this->getParentCategories();
2738
2739                 if($parents != '') {
2740                         foreach($parents as $parent => $current) {
2741                                 if ( array_key_exists( $parent, $children ) ) {
2742                                         # Circular reference
2743                                         $stack[$parent] = array();
2744                                 } else {
2745                                         $nt = Title::newFromText($parent);
2746                                         if ( $nt ) {
2747                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2748                                         }
2749                                 }
2750                         }
2751                         return $stack;
2752                 } else {
2753                         return array();
2754                 }
2755         }
2756
2757
2758         /**
2759          * Get an associative array for selecting this title from
2760          * the "page" table
2761          *
2762          * @return array
2763          */
2764         public function pageCond() {
2765                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2766         }
2767
2768         /**
2769          * Get the revision ID of the previous revision
2770          *
2771          * @param integer $revision  Revision ID. Get the revision that was before this one.
2772          * @return integer $oldrevision|false
2773          */
2774         public function getPreviousRevisionID( $revision ) {
2775                 $dbr = wfGetDB( DB_SLAVE );
2776                 return $dbr->selectField( 'revision', 'rev_id',
2777                         'rev_page=' . intval( $this->getArticleId() ) .
2778                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2779         }
2780
2781         /**
2782          * Get the revision ID of the next revision
2783          *
2784          * @param integer $revision  Revision ID. Get the revision that was after this one.
2785          * @return integer $oldrevision|false
2786          */
2787         public function getNextRevisionID( $revision ) {
2788                 $dbr = wfGetDB( DB_SLAVE );
2789                 return $dbr->selectField( 'revision', 'rev_id',
2790                         'rev_page=' . intval( $this->getArticleId() ) .
2791                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2792         }
2793
2794         /**
2795          * Get the number of revisions between the given revision IDs.
2796          *
2797          * @param integer $old  Revision ID.
2798          * @param integer $new  Revision ID.
2799          * @return integer  Number of revisions between these IDs.
2800          */
2801         public function countRevisionsBetween( $old, $new ) {
2802                 $dbr = wfGetDB( DB_SLAVE );
2803                 return $dbr->selectField( 'revision', 'count(*)',
2804                         'rev_page = ' . intval( $this->getArticleId() ) .
2805                         ' AND rev_id > ' . intval( $old ) .
2806                         ' AND rev_id < ' . intval( $new ) );
2807         }
2808
2809         /**
2810          * Compare with another title.
2811          *
2812          * @param Title $title
2813          * @return bool
2814          */
2815         public function equals( $title ) {
2816                 // Note: === is necessary for proper matching of number-like titles.
2817                 return $this->getInterwiki() === $title->getInterwiki()
2818                         && $this->getNamespace() == $title->getNamespace()
2819                         && $this->getDBkey() === $title->getDBkey();
2820         }
2821
2822         /**
2823          * Return a string representation of this title
2824          *
2825          * @return string
2826          */
2827         public function __toString() {
2828                 return $this->getPrefixedText();
2829         }
2830
2831         /**
2832          * Check if page exists
2833          * @return bool
2834          */
2835         public function exists() {
2836                 return $this->getArticleId() != 0;
2837         }
2838
2839         /**
2840          * Do we know that this title definitely exists, or should we otherwise
2841          * consider that it exists?
2842          *
2843          * @return bool
2844          */
2845         public function isAlwaysKnown() {
2846                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2847                 // the full l10n of that language to be loaded. That takes much memory and
2848                 // isn't needed. So we strip the language part away.
2849                 // Also, extension messages which are not loaded, are shown as red, because
2850                 // we don't call MessageCache::loadAllMessages.
2851                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2852                 return $this->isExternal()
2853                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2854                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2855         }
2856
2857         /**
2858          * Update page_touched timestamps and send squid purge messages for
2859          * pages linking to this title. May be sent to the job queue depending
2860          * on the number of links. Typically called on create and delete.
2861          */
2862         public function touchLinks() {
2863                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2864                 $u->doUpdate();
2865
2866                 if ( $this->getNamespace() == NS_CATEGORY ) {
2867                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2868                         $u->doUpdate();
2869                 }
2870         }
2871
2872         /**
2873          * Get the last touched timestamp
2874          */
2875         public function getTouched() {
2876                 $dbr = wfGetDB( DB_SLAVE );
2877                 $touched = $dbr->selectField( 'page', 'page_touched',
2878                         array(
2879                                 'page_namespace' => $this->getNamespace(),
2880                                 'page_title' => $this->getDBkey()
2881                         ), __METHOD__
2882                 );
2883                 return $touched;
2884         }
2885
2886         public function trackbackURL() {
2887                 global $wgTitle, $wgScriptPath, $wgServer;
2888
2889                 return "$wgServer$wgScriptPath/trackback.php?article="
2890                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2891         }
2892
2893         public function trackbackRDF() {
2894                 $url = htmlspecialchars($this->getFullURL());
2895                 $title = htmlspecialchars($this->getText());
2896                 $tburl = $this->trackbackURL();
2897
2898                 // Autodiscovery RDF is placed in comments so HTML validator
2899                 // won't barf. This is a rather icky workaround, but seems
2900                 // frequently used by this kind of RDF thingy.
2901                 //
2902                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
2903                 return "<!--
2904 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2905          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2906          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2907 <rdf:Description
2908    rdf:about=\"$url\"
2909    dc:identifier=\"$url\"
2910    dc:title=\"$title\"
2911    trackback:ping=\"$tburl\" />
2912 </rdf:RDF>
2913 -->";
2914         }
2915
2916         /**
2917          * Generate strings used for xml 'id' names in monobook tabs
2918          * @return string
2919          */
2920         public function getNamespaceKey() {
2921                 global $wgContLang;
2922                 switch ($this->getNamespace()) {
2923                         case NS_MAIN:
2924                         case NS_TALK:
2925                                 return 'nstab-main';
2926                         case NS_USER:
2927                         case NS_USER_TALK:
2928                                 return 'nstab-user';
2929                         case NS_MEDIA:
2930                                 return 'nstab-media';
2931                         case NS_SPECIAL:
2932                                 return 'nstab-special';
2933                         case NS_PROJECT:
2934                         case NS_PROJECT_TALK:
2935                                 return 'nstab-project';
2936                         case NS_IMAGE:
2937                         case NS_IMAGE_TALK:
2938                                 return 'nstab-image';
2939                         case NS_MEDIAWIKI:
2940                         case NS_MEDIAWIKI_TALK:
2941                                 return 'nstab-mediawiki';
2942                         case NS_TEMPLATE:
2943                         case NS_TEMPLATE_TALK:
2944                                 return 'nstab-template';
2945                         case NS_HELP:
2946                         case NS_HELP_TALK:
2947                                 return 'nstab-help';
2948                         case NS_CATEGORY:
2949                         case NS_CATEGORY_TALK:
2950                                 return 'nstab-category';
2951                         default:
2952                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2953                 }
2954         }
2955
2956         /**
2957          * Returns true if this title resolves to the named special page
2958          * @param string $name The special page name
2959          */
2960         public function isSpecial( $name ) {
2961                 if ( $this->getNamespace() == NS_SPECIAL ) {
2962                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2963                         if ( $name == $thisName ) {
2964                                 return true;
2965                         }
2966                 }
2967                 return false;
2968         }
2969
2970         /**
2971          * If the Title refers to a special page alias which is not the local default,
2972          * returns a new Title which points to the local default. Otherwise, returns $this.
2973          */
2974         public function fixSpecialName() {
2975                 if ( $this->getNamespace() == NS_SPECIAL ) {
2976                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2977                         if ( $canonicalName ) {
2978                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2979                                 if ( $localName != $this->mDbkeyform ) {
2980                                         return Title::makeTitle( NS_SPECIAL, $localName );
2981                                 }
2982                         }
2983                 }
2984                 return $this;
2985         }
2986
2987         /**
2988          * Is this Title in a namespace which contains content?
2989          * In other words, is this a content page, for the purposes of calculating
2990          * statistics, etc?
2991          *
2992          * @return bool
2993          */
2994         public function isContentPage() {
2995                 return MWNamespace::isContent( $this->getNamespace() );
2996         }
2997
2998 }