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