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( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $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 lowest-level subpage name, i.e. the rightmost part after /
 689          * @return string Subpage name
 690          */
 691         public function getSubpageText() {
 692                 global $wgNamespacesWithSubpages;
 693                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 694                         $parts = explode( '/', $this->mTextform );
 695                         return( $parts[ count( $parts ) - 1 ] );
 696                 } else {
 697                         return( $this->mTextform );
 698                 }
 699         }
 700
 701         /**
 702          * Get a URL-encoded form of the subpage text
 703          * @return string URL-encoded subpage name
 704          */
 705         public function getSubpageUrlForm() {
 706                 $text = $this->getSubpageText();
 707                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 708                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 709                 return( $text );
 710         }
 711
 712         /**
 713          * Get a URL-encoded title (not an actual URL) including interwiki
 714          * @return string the URL-encoded form
 715          */
 716         public function getPrefixedURL() {
 717                 $s = $this->prefix( $this->mDbkeyform );
 718                 $s = str_replace( ' ', '_', $s );
 719
 720                 $s = wfUrlencode ( $s ) ;
 721
 722                 # Cleaning up URL to make it look nice -- is this safe?
 723                 $s = str_replace( '%28', '(', $s );
 724                 $s = str_replace( '%29', ')', $s );
 725
 726                 return $s;
 727         }
 728
 729         /**
 730          * Get a real URL referring to this title, with interwiki link and
 731          * fragment
 732          *
 733          * @param string $query an optional query string, not used
 734          *      for interwiki links
 735          * @param string $variant language variant of url (for sr, zh..)
 736          * @return string the URL
 737          */
 738         public function getFullURL( $query = '', $variant = false ) {
 739                 global $wgContLang, $wgServer, $wgRequest;
 740
 741                 if ( '' == $this->mInterwiki ) {
 742                         $url = $this->getLocalUrl( $query, $variant );
 743
 744                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 745                         // Correct fix would be to move the prepending elsewhere.
 746                         if ($wgRequest->getVal('action') != 'render') {
 747                                 $url = $wgServer . $url;
 748                         }
 749                 } else {
 750                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 751
 752                         $namespace = wfUrlencode( $this->getNsText() );
 753                         if ( '' != $namespace ) {
 754                                 # Can this actually happen? Interwikis shouldn't be parsed.
 755                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 756                                 $namespace .= ':';
 757                         }
 758                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 759                         $url = wfAppendQuery( $url, $query );
 760                 }
 761
 762                 # Finally, add the fragment.
 763                 $url .= $this->getFragmentForURL();
 764
 765                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 766                 return $url;
 767         }
 768
 769         /**
 770          * Get a URL with no fragment or server name.  If this page is generated
 771          * with action=render, $wgServer is prepended.
 772          * @param string $query an optional query string; if not specified,
 773          *      $wgArticlePath will be used.
 774          * @param string $variant language variant of url (for sr, zh..)
 775          * @return string the URL
 776          */
 777         public function getLocalURL( $query = '', $variant = false ) {
 778                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 779                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 780
 781                 // internal links should point to same variant as current page (only anonymous users)
 782                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 783                         $pref = $wgContLang->getPreferredVariant(false);
 784                         if($pref != $wgContLang->getCode())
 785                                 $variant = $pref;
 786                 }
 787
 788                 if ( $this->isExternal() ) {
 789                         $url = $this->getFullURL();
 790                         if ( $query ) {
 791                                 // This is currently only used for edit section links in the
 792                                 // context of interwiki transclusion. In theory we should
 793                                 // append the query to the end of any existing query string,
 794                                 // but interwiki transclusion is already broken in that case.
 795                                 $url .= "?$query";
 796                         }
 797                 } else {
 798                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 799                         if ( $query == '' ) {
 800                                 if($variant!=false && $wgContLang->hasVariants()){
 801                                         if($wgVariantArticlePath==false) {
 802                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 803                                         } else {
 804                                                 $variantArticlePath = $wgVariantArticlePath;
 805                                         }
 806                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 807                                         $url = str_replace( '$1', $dbkey, $url  );
 808                                 }
 809                                 else {
 810                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 811                                 }
 812                         } else {
 813                                 global $wgActionPaths;
 814                                 $url = false;
 815                                 $matches = array();
 816                                 if( !empty( $wgActionPaths ) &&
 817                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 818                                 {
 819                                         $action = urldecode( $matches[2] );
 820                                         if( isset( $wgActionPaths[$action] ) ) {
 821                                                 $query = $matches[1];
 822                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 823                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 824                                                 if( $query != '' ) $url .= '?' . $query;
 825                                         }
 826                                 }
 827                                 if ( $url === false ) {
 828                                         if ( $query == '-' ) {
 829                                                 $query = '';
 830                                         }
 831                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 832                                 }
 833                         }
 834
 835                         // FIXME: this causes breakage in various places when we
 836                         // actually expected a local URL and end up with dupe prefixes.
 837                         if ($wgRequest->getVal('action') == 'render') {
 838                                 $url = $wgServer . $url;
 839                         }
 840                 }
 841                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 842                 return $url;
 843         }
 844
 845         /**
 846          * Get an HTML-escaped version of the URL form, suitable for
 847          * using in a link, without a server name or fragment
 848          * @param string $query an optional query string
 849          * @return string the URL
 850          */
 851         public function escapeLocalURL( $query = '' ) {
 852                 return htmlspecialchars( $this->getLocalURL( $query ) );
 853         }
 854
 855         /**
 856          * Get an HTML-escaped version of the URL form, suitable for
 857          * using in a link, including the server name and fragment
 858          *
 859          * @return string the URL
 860          * @param string $query an optional query string
 861          */
 862         public function escapeFullURL( $query = '' ) {
 863                 return htmlspecialchars( $this->getFullURL( $query ) );
 864         }
 865
 866         /**
 867          * Get the URL form for an internal link.
 868          * - Used in various Squid-related code, in case we have a different
 869          * internal hostname for the server from the exposed one.
 870          *
 871          * @param string $query an optional query string
 872          * @param string $variant language variant of url (for sr, zh..)
 873          * @return string the URL
 874          */
 875         public function getInternalURL( $query = '', $variant = false ) {
 876                 global $wgInternalServer;
 877                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 878                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 879                 return $url;
 880         }
 881
 882         /**
 883          * Get the edit URL for this Title
 884          * @return string the URL, or a null string if this is an
 885          *      interwiki link
 886          */
 887         public function getEditURL() {
 888                 if ( '' != $this->mInterwiki ) { return ''; }
 889                 $s = $this->getLocalURL( 'action=edit' );
 890
 891                 return $s;
 892         }
 893
 894         /**
 895          * Get the HTML-escaped displayable text form.
 896          * Used for the title field in <a> tags.
 897          * @return string the text, including any prefixes
 898          */
 899         public function getEscapedText() {
 900                 return htmlspecialchars( $this->getPrefixedText() );
 901         }
 902
 903         /**
 904          * Is this Title interwiki?
 905          * @return boolean
 906          */
 907         public function isExternal() { return ( '' != $this->mInterwiki ); }
 908
 909         /**
 910          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 911          *
 912          * @param string Action to check (default: edit)
 913          * @return bool
 914          */
 915         public function isSemiProtected( $action = 'edit' ) {
 916                 if( $this->exists() ) {
 917                         $restrictions = $this->getRestrictions( $action );
 918                         if( count( $restrictions ) > 0 ) {
 919                                 foreach( $restrictions as $restriction ) {
 920                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 921                                                 return false;
 922                                 }
 923                         } else {
 924                                 # Not protected
 925                                 return false;
 926                         }
 927                         return true;
 928                 } else {
 929                         # If it doesn't exist, it can't be protected
 930                         return false;
 931                 }
 932         }
 933
 934         /**
 935          * Does the title correspond to a protected article?
 936          * @param string $what the action the page is protected from,
 937          * by default checks move and edit
 938          * @return boolean
 939          */
 940         public function isProtected( $action = '' ) {
 941                 global $wgRestrictionLevels;
 942
 943                 # Special pages have inherent protection
 944                 if( $this->getNamespace() == NS_SPECIAL )
 945                         return true;
 946
 947                 # Check regular protection levels
 948                 if( $action == 'edit' || $action == '' ) {
 949                         $r = $this->getRestrictions( 'edit' );
 950                         foreach( $wgRestrictionLevels as $level ) {
 951                                 if( in_array( $level, $r ) && $level != '' ) {
 952                                         return( true );
 953                                 }
 954                         }
 955                 }
 956
 957                 if( $action == 'move' || $action == '' ) {
 958                         $r = $this->getRestrictions( 'move' );
 959                         foreach( $wgRestrictionLevels as $level ) {
 960                                 if( in_array( $level, $r ) && $level != '' ) {
 961                                         return( true );
 962                                 }
 963                         }
 964                 }
 965
 966                 return false;
 967         }
 968
 969         /**
 970          * Is $wgUser is watching this page?
 971          * @return boolean
 972          */
 973         public function userIsWatching() {
 974                 global $wgUser;
 975
 976                 if ( is_null( $this->mWatched ) ) {
 977                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 978                                 $this->mWatched = false;
 979                         } else {
 980                                 $this->mWatched = $wgUser->isWatched( $this );
 981                         }
 982                 }
 983                 return $this->mWatched;
 984         }
 985
 986         /**
 987          * Can $wgUser perform $action on this page?
 988          * This skips potentially expensive cascading permission checks.
 989          *
 990          * Suitable for use for nonessential UI controls in common cases, but
 991          * _not_ for functional access control.
 992          *
 993          * May provide false positives, but should never provide a false negative.
 994          *
 995          * @param string $action action that permission needs to be checked for
 996          * @return boolean
 997          */
 998         public function quickUserCan( $action ) {
 999                 return $this->userCan( $action, false );
1000         }
1001
1002         /**
1003          * Determines if $wgUser is unable to edit this page because it has been protected
1004          * by $wgNamespaceProtection.
1005          *
1006          * @return boolean
1007          */
1008         public function isNamespaceProtected() {
1009                 global $wgNamespaceProtection, $wgUser;
1010                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1011                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1012                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1013                                         return true;
1014                         }
1015                 }
1016                 return false;
1017         }
1018
1019         /**
1020          * Can $wgUser perform $action on this page?
1021          * @param string $action action that permission needs to be checked for
1022          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1023          * @return boolean
1024          */
1025         public function userCan( $action, $doExpensiveQueries = true ) {
1026                 global $wgUser;
1027                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1028         }
1029
1030         /**
1031          * Can $user perform $action on this page?
1032          *
1033          * FIXME: This *does not* check throttles (User::pingLimiter()).
1034          *
1035          * @param string $action action that permission needs to be checked for
1036          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1037          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1038          */
1039         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1040                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1041
1042                 global $wgContLang;
1043                 global $wgLang;
1044                 global $wgEmailConfirmToEdit, $wgUser;
1045
1046                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1047                         $errors[] = array( 'confirmedittext' );
1048                 }
1049
1050                 if ( $user->isBlockedFrom( $this ) ) {
1051                         $block = $user->mBlock;
1052
1053                         // This is from OutputPage::blockedPage
1054                         // Copied at r23888 by werdna
1055
1056                         $id = $user->blockedBy();
1057                         $reason = $user->blockedFor();
1058                         if( $reason == '' ) {
1059                                 $reason = wfMsg( 'blockednoreason' );
1060                         }
1061                         $ip = wfGetIP();
1062
1063                         if ( is_numeric( $id ) ) {
1064                                 $name = User::whoIs( $id );
1065                         } else {
1066                                 $name = $id;
1067                         }
1068
1069                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1070                         $blockid = $block->mId;
1071                         $blockExpiry = $user->mBlock->mExpiry;
1072                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1073
1074                         if ( $blockExpiry == 'infinity' ) {
1075                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1076                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1077
1078                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1079                                         if ( strpos( $option, ':' ) == false )
1080                                                 continue;
1081
1082                                         list ($show, $value) = explode( ":", $option );
1083
1084                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1085                                                 $blockExpiry = $show;
1086                                                 break;
1087                                         }
1088                                 }
1089                         } else {
1090                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1091                         }
1092
1093                         $intended = $user->mBlock->mAddress;
1094
1095                         $errors[] = array ( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
1096                 }
1097
1098                 return $errors;
1099         }
1100
1101         /**
1102          * Can $user perform $action on this page? This is an internal function,
1103          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1104          * checks on wfReadOnly() and blocks)
1105          *
1106          * @param string $action action that permission needs to be checked for
1107          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1108          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1109          */
1110         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1111                 wfProfileIn( __METHOD__ );
1112
1113                 $errors = array();
1114
1115                 // Use getUserPermissionsErrors instead
1116                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1117                         return $result ? array() : array( array( 'badaccess-group0' ) );
1118                 }
1119
1120                 if (!wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1121                         if ($result != array() && is_array($result) && !is_array($result[0]))
1122                                 $errors[] = $result; # A single array representing an error
1123                         else if (is_array($result) && is_array($result[0]))
1124                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1125                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1126                                 $errors[] = array($result); # A string representing a message-id
1127                         else if ($result === false )
1128                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1129                 }
1130                 if ($doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1131                         if ($result != array() && is_array($result) && !is_array($result[0]))
1132                                 $errors[] = $result; # A single array representing an error
1133                         else if (is_array($result) && is_array($result[0]))
1134                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1135                         else if ($result != '' && $result != null && $result !== true && $result !== false)
1136                                 $errors[] = array($result); # A string representing a message-id
1137                         else if ($result === false )
1138                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1139                 }
1140
1141                 if( NS_SPECIAL == $this->mNamespace ) {
1142                         $errors[] = array('ns-specialprotected');
1143                 }
1144
1145                 if ( $this->isNamespaceProtected() ) {
1146                         $ns = $this->getNamespace() == NS_MAIN
1147                                 ? wfMsg( 'nstab-main' )
1148                                 : $this->getNsText();
1149                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1150                                 ? array('protectedinterface')
1151                                 : array( 'namespaceprotected',  $ns ) );
1152                 }
1153
1154                 if( $this->mDbkeyform == '_' ) {
1155                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1156                         $errors[] = array('badaccess-group0');
1157                 }
1158
1159                 # protect css/js subpages of user pages
1160                 # XXX: this might be better using restrictions
1161                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1162                 if( $this->isCssJsSubpage()
1163                         && !$user->isAllowed('editusercssjs')
1164                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1165                         $errors[] = array('customcssjsprotected');
1166                 }
1167
1168                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1169                         # We /could/ use the protection level on the source page, but it's fairly ugly
1170                         #  as we have to establish a precedence hierarchy for pages included by multiple
1171                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1172                         #  as they could remove the protection anyway.
1173                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1174                         # Cascading protection depends on more than this page...
1175                         # Several cascading protected pages may include this page...
1176                         # Check each cascading level
1177                         # This is only for protection restrictions, not for all actions
1178                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1179                                 foreach( $restrictions[$action] as $right ) {
1180                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1181                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1182                                                 $pages = '';
1183                                                 foreach( $cascadingSources as $page )
1184                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1185                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1186                                         }
1187                                 }
1188                         }
1189                 }
1190
1191                 foreach( $this->getRestrictions($action) as $right ) {
1192                         // Backwards compatibility, rewrite sysop -> protect
1193                         if ( $right == 'sysop' ) {
1194                                 $right = 'protect';
1195                         }
1196                         if( '' != $right && !$user->isAllowed( $right ) ) {
1197                                 $errors[] = array( 'protectedpagetext', $right );
1198                         }
1199                 }
1200
1201                 if ($action == 'protect') {
1202                         if ($this->getUserPermissionsErrors('edit', $user) != array()) {
1203                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1204                         }
1205                 }
1206
1207                 if ($action == 'create') {
1208                         $title_protection = $this->getTitleProtection();
1209
1210                         if (is_array($title_protection)) {
1211                                 extract($title_protection);
1212
1213                                 if ($pt_create_perm == 'sysop')
1214                                         $pt_create_perm = 'protect';
1215
1216                                 if ($pt_create_perm == '' || !$user->isAllowed($pt_create_perm)) {
1217                                         $errors[] = array ( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1218                                 }
1219                         }
1220
1221                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1222                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1223                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1224                         }
1225                 } elseif( $action == 'move' && !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1226                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1227                 } elseif ( !$user->isAllowed( $action ) ) {
1228                         $return = null;
1229                         $groups = array();
1230                         global $wgGroupPermissions;
1231                         foreach( $wgGroupPermissions as $key => $value ) {
1232                                 if( isset( $value[$action] ) && $value[$action] == true ) {
1233                                         $groupName = User::getGroupName( $key );
1234                                         $groupPage = User::getGroupPage( $key );
1235                                         if( $groupPage ) {
1236                                                 $groups[] = '[['.$groupPage->getPrefixedText().'|'.$groupName.']]';
1237                                         } else {
1238                                                 $groups[] = $groupName;
1239                                         }
1240                                 }
1241                         }
1242                         $n = count( $groups );
1243                         $groups = implode( ', ', $groups );
1244                         switch( $n ) {
1245                                 case 0:
1246                                 case 1:
1247                                 case 2:
1248                                         $return = array( "badaccess-group$n", $groups );
1249                                         break;
1250                                 default:
1251                                         $return = array( 'badaccess-groups', $groups );
1252                         }
1253                         $errors[] = $return;
1254                 }
1255
1256                 wfProfileOut( __METHOD__ );
1257                 return $errors;
1258         }
1259
1260         /**
1261          * Is this title subject to title protection?
1262          * @return mixed An associative array representing any existent title
1263          *   protection, or false if there's none.
1264          */
1265         private function getTitleProtection() {
1266                 // Can't protect pages in special namespaces
1267                 if ( $this->getNamespace() < 0 ) {
1268                         return false;
1269                 }
1270
1271                 $dbr = wfGetDB( DB_SLAVE );
1272                 $res = $dbr->select( 'protected_titles', '*',
1273                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()) );
1274
1275                 if ($row = $dbr->fetchRow( $res )) {
1276                         return $row;
1277                 } else {
1278                         return false;
1279                 }
1280         }
1281
1282         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1283                 global $wgGroupPermissions,$wgUser,$wgContLang;
1284
1285                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1286                         && $expiry == $this->mRestrictionsExpiry) {
1287                         // No change
1288                         return true;
1289                 }
1290
1291                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1292
1293                 $dbw = wfGetDB( DB_MASTER );
1294
1295                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1296
1297                 $expiry_description = '';
1298                 if ( $encodedExpiry != 'infinity' ) {
1299                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) ).')';
1300                 }
1301
1302                 # Update protection table
1303                 if ($create_perm != '' ) {
1304                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1305                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1306                                         , 'pt_create_perm' => $create_perm
1307                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1308                                         , 'pt_expiry' => $encodedExpiry
1309                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1310                 } else {
1311                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1312                                 'pt_title' => $title ), __METHOD__ );
1313                 }
1314                 # Update the protection log
1315                 $log = new LogPage( 'protect' );
1316
1317                 if( $create_perm ) {
1318                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason . " [create=$create_perm] $expiry_description" ) );
1319                 } else {
1320                         $log->addEntry( 'unprotect', $this, $reason );
1321                 }
1322
1323                 return true;
1324         }
1325
1326         /**
1327          * Remove any title protection (due to page existing
1328          */
1329         public function deleteTitleProtection() {
1330                 $dbw = wfGetDB( DB_MASTER );
1331
1332                 $dbw->delete( 'protected_titles',
1333                         array ('pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey()), __METHOD__ );
1334         }
1335
1336         /**
1337          * Can $wgUser edit this page?
1338          * @return boolean
1339          * @deprecated use userCan('edit')
1340          */
1341         public function userCanEdit( $doExpensiveQueries = true ) {
1342                 return $this->userCan( 'edit', $doExpensiveQueries );
1343         }
1344
1345         /**
1346          * Can $wgUser create this page?
1347          * @return boolean
1348          * @deprecated use userCan('create')
1349          */
1350         public function userCanCreate( $doExpensiveQueries = true ) {
1351                 return $this->userCan( 'create', $doExpensiveQueries );
1352         }
1353
1354         /**
1355          * Can $wgUser move this page?
1356          * @return boolean
1357          * @deprecated use userCan('move')
1358          */
1359         public function userCanMove( $doExpensiveQueries = true ) {
1360                 return $this->userCan( 'move', $doExpensiveQueries );
1361         }
1362
1363         /**
1364          * Would anybody with sufficient privileges be able to move this page?
1365          * Some pages just aren't movable.
1366          *
1367          * @return boolean
1368          */
1369         public function isMovable() {
1370                 return Namespace::isMovable( $this->getNamespace() )
1371                         && $this->getInterwiki() == '';
1372         }
1373
1374         /**
1375          * Can $wgUser read this page?
1376          * @return boolean
1377          * @todo fold these checks into userCan()
1378          */
1379         public function userCanRead() {
1380                 global $wgUser, $wgGroupPermissions;
1381
1382                 # Shortcut for public wikis, allows skipping quite a bit of code path
1383                 if ($wgGroupPermissions['*']['read'])
1384                         return true;
1385
1386                 $result = null;
1387                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1388                 if ( $result !== null ) {
1389                         return $result;
1390                 }
1391
1392                 if( $wgUser->isAllowed( 'read' ) ) {
1393                         return true;
1394                 } else {
1395                         global $wgWhitelistRead;
1396
1397                         /**
1398                          * Always grant access to the login page.
1399                          * Even anons need to be able to log in.
1400                         */
1401                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1402                                 return true;
1403                         }
1404
1405                         /**
1406                          * Bail out if there isn't whitelist
1407                          */
1408                         if( !is_array($wgWhitelistRead) ) {
1409                                 return false;
1410                         }
1411
1412                         /**
1413                          * Check for explicit whitelisting
1414                          */
1415                         $name = $this->getPrefixedText();
1416                         if( in_array( $name, $wgWhitelistRead, true ) )
1417                                 return true;
1418
1419                         /**
1420                          * Old settings might have the title prefixed with
1421                          * a colon for main-namespace pages
1422                          */
1423                         if( $this->getNamespace() == NS_MAIN ) {
1424                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1425                                         return true;
1426                         }
1427
1428                         /**
1429                          * If it's a special page, ditch the subpage bit
1430                          * and check again
1431                          */
1432                         if( $this->getNamespace() == NS_SPECIAL ) {
1433                                 $name = $this->getDBkey();
1434                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1435                                 if ( $name === false ) {
1436                                         # Invalid special page, but we show standard login required message
1437                                         return false;
1438                                 }
1439
1440                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1441                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1442                                         return true;
1443                         }
1444
1445                 }
1446                 return false;
1447         }
1448
1449         /**
1450          * Is this a talk page of some sort?
1451          * @return bool
1452          */
1453         public function isTalkPage() {
1454                 return Namespace::isTalk( $this->getNamespace() );
1455         }
1456
1457         /**
1458          * Is this a subpage?
1459          * @return bool
1460          */
1461         public function isSubpage() {
1462                 global $wgNamespacesWithSubpages;
1463
1464                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1465                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1466                 } else {
1467                         return false;
1468                 }
1469         }
1470
1471         /**
1472          * Could this page contain custom CSS or JavaScript, based
1473          * on the title?
1474          *
1475          * @return bool
1476          */
1477         public function isCssOrJsPage() {
1478                 return $this->mNamespace == NS_MEDIAWIKI
1479                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1480         }
1481
1482         /**
1483          * Is this a .css or .js subpage of a user page?
1484          * @return bool
1485          */
1486         public function isCssJsSubpage() {
1487                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1488         }
1489         /**
1490          * Is this a *valid* .css or .js subpage of a user page?
1491          * Check that the corresponding skin exists
1492          */
1493         public function isValidCssJsSubpage() {
1494                 if ( $this->isCssJsSubpage() ) {
1495                         $skinNames = Skin::getSkinNames();
1496                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1497                 } else {
1498                         return false;
1499                 }
1500         }
1501         /**
1502          * Trim down a .css or .js subpage title to get the corresponding skin name
1503          */
1504         public function getSkinFromCssJsSubpage() {
1505                 $subpage = explode( '/', $this->mTextform );
1506                 $subpage = $subpage[ count( $subpage ) - 1 ];
1507                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1508         }
1509         /**
1510          * Is this a .css subpage of a user page?
1511          * @return bool
1512          */
1513         public function isCssSubpage() {
1514                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1515         }
1516         /**
1517          * Is this a .js subpage of a user page?
1518          * @return bool
1519          */
1520         public function isJsSubpage() {
1521                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1522         }
1523         /**
1524          * Protect css/js subpages of user pages: can $wgUser edit
1525          * this page?
1526          *
1527          * @return boolean
1528          * @todo XXX: this might be better using restrictions
1529          */
1530         public function userCanEditCssJsSubpage() {
1531                 global $wgUser;
1532                 return ( $wgUser->isAllowed('editusercssjs') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1533         }
1534
1535         /**
1536          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1537          *
1538          * @return bool If the page is subject to cascading restrictions.
1539          */
1540         public function isCascadeProtected() {
1541                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1542                 return ( $sources > 0 );
1543         }
1544
1545         /**
1546          * Cascading protection: Get the source of any cascading restrictions on this page.
1547          *
1548          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1549          * @return array( mixed title array, restriction array)
1550          * 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.
1551          * The restriction array is an array of each type, each of which contains an array of unique groups
1552          */
1553         public function getCascadeProtectionSources( $get_pages = true ) {
1554                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1555
1556                 # Define our dimension of restrictions types
1557                 $pagerestrictions = array();
1558                 foreach( $wgRestrictionTypes as $action )
1559                         $pagerestrictions[$action] = array();
1560
1561                 if (!$wgEnableCascadingProtection)
1562                         return array( false, $pagerestrictions );
1563
1564                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1565                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1566                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1567                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1568                 }
1569
1570                 wfProfileIn( __METHOD__ );
1571
1572                 $dbr = wfGetDb( DB_SLAVE );
1573
1574                 if ( $this->getNamespace() == NS_IMAGE ) {
1575                         $tables = array ('imagelinks', 'page_restrictions');
1576                         $where_clauses = array(
1577                                 'il_to' => $this->getDBkey(),
1578                                 'il_from=pr_page',
1579                                 'pr_cascade' => 1 );
1580                 } else {
1581                         $tables = array ('templatelinks', 'page_restrictions');
1582                         $where_clauses = array(
1583                                 'tl_namespace' => $this->getNamespace(),
1584                                 'tl_title' => $this->getDBkey(),
1585                                 'tl_from=pr_page',
1586                                 'pr_cascade' => 1 );
1587                 }
1588
1589                 if ( $get_pages ) {
1590                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1591                         $where_clauses[] = 'page_id=pr_page';
1592                         $tables[] = 'page';
1593                 } else {
1594                         $cols = array( 'pr_expiry' );
1595                 }
1596
1597                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1598
1599                 $sources = $get_pages ? array() : false;
1600                 $now = wfTimestampNow();
1601                 $purgeExpired = false;
1602
1603                 while( $row = $dbr->fetchObject( $res ) ) {
1604                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1605                         if( $expiry > $now ) {
1606                                 if ($get_pages) {
1607                                         $page_id = $row->pr_page;
1608                                         $page_ns = $row->page_namespace;
1609                                         $page_title = $row->page_title;
1610                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1611                                         # Add groups needed for each restriction type if its not already there
1612                                         # Make sure this restriction type still exists
1613                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1614                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1615                                         }
1616                                 } else {
1617                                         $sources = true;
1618                                 }
1619                         } else {
1620                                 // Trigger lazy purge of expired restrictions from the db
1621                                 $purgeExpired = true;
1622                         }
1623                 }
1624                 if( $purgeExpired ) {
1625                         Title::purgeExpiredRestrictions();
1626                 }
1627
1628                 wfProfileOut( __METHOD__ );
1629
1630                 if ( $get_pages ) {
1631                         $this->mCascadeSources = $sources;
1632                         $this->mCascadingRestrictions = $pagerestrictions;
1633                 } else {
1634                         $this->mHasCascadingRestrictions = $sources;
1635                 }
1636
1637                 return array( $sources, $pagerestrictions );
1638         }
1639
1640         function areRestrictionsCascading() {
1641                 if (!$this->mRestrictionsLoaded) {
1642                         $this->loadRestrictions();
1643                 }
1644
1645                 return $this->mCascadeRestriction;
1646         }
1647
1648         /**
1649          * Loads a string into mRestrictions array
1650          * @param resource $res restrictions as an SQL result.
1651          */
1652         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1653                 $dbr = wfGetDb( DB_SLAVE );
1654
1655                 $this->mRestrictions['edit'] = array();
1656                 $this->mRestrictions['move'] = array();
1657
1658                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1659
1660                 if ( $oldFashionedRestrictions == NULL ) {
1661                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1662                 }
1663
1664                 if ($oldFashionedRestrictions != '') {
1665
1666                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1667                                 $temp = explode( '=', trim( $restrict ) );
1668                                 if(count($temp) == 1) {
1669                                         // old old format should be treated as edit/move restriction
1670                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1671                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1672                                 } else {
1673                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1674                                 }
1675                         }
1676
1677                         $this->mOldRestrictions = true;
1678                         $this->mCascadeRestriction = false;
1679                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1680
1681                 }
1682
1683                 if( $dbr->numRows( $res ) ) {
1684                         # Current system - load second to make them override.
1685                         $now = wfTimestampNow();
1686                         $purgeExpired = false;
1687
1688                         while ($row = $dbr->fetchObject( $res ) ) {
1689                                 # Cycle through all the restrictions.
1690
1691                                 // This code should be refactored, now that it's being used more generally,
1692                                 // But I don't really see any harm in leaving it in Block for now -werdna
1693                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1694
1695                                 // Only apply the restrictions if they haven't expired!
1696                                 if ( !$expiry || $expiry > $now ) {
1697                                         $this->mRestrictionsExpiry = $expiry;
1698                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1699
1700                                         $this->mCascadeRestriction |= $row->pr_cascade;
1701                                 } else {
1702                                         // Trigger a lazy purge of expired restrictions
1703                                         $purgeExpired = true;
1704                                 }
1705                         }
1706
1707                         if( $purgeExpired ) {
1708                                 Title::purgeExpiredRestrictions();
1709                         }
1710                 }
1711
1712                 $this->mRestrictionsLoaded = true;
1713         }
1714
1715         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1716                 if( !$this->mRestrictionsLoaded ) {
1717                         if ($this->exists()) {
1718                                 $dbr = wfGetDB( DB_SLAVE );
1719
1720                                 $res = $dbr->select( 'page_restrictions', '*',
1721                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1722
1723                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1724                         } else {
1725                                 $title_protection = $this->getTitleProtection();
1726
1727                                 if (is_array($title_protection)) {
1728                                         extract($title_protection);
1729
1730                                         $now = wfTimestampNow();
1731                                         $expiry = Block::decodeExpiry($pt_expiry);
1732
1733                                         if (!$expiry || $expiry > $now) {
1734                                                 // Apply the restrictions
1735                                                 $this->mRestrictionsExpiry = $expiry;
1736                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1737                                         } else { // Get rid of the old restrictions
1738                                                 Title::purgeExpiredRestrictions();
1739                                         }
1740                                 }
1741                                 $this->mRestrictionsLoaded = true;
1742                         }
1743                 }
1744         }
1745
1746         /**
1747          * Purge expired restrictions from the page_restrictions table
1748          */
1749         static function purgeExpiredRestrictions() {
1750                 $dbw = wfGetDB( DB_MASTER );
1751                 $dbw->delete( 'page_restrictions',
1752                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1753                         __METHOD__ );
1754
1755                 $dbw->delete( 'protected_titles',
1756                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1757                         __METHOD__ );
1758         }
1759
1760         /**
1761          * Accessor/initialisation for mRestrictions
1762          *
1763          * @param string $action action that permission needs to be checked for
1764          * @return array the array of groups allowed to edit this article
1765          */
1766         public function getRestrictions( $action ) {
1767                 if( !$this->mRestrictionsLoaded ) {
1768                         $this->loadRestrictions();
1769                 }
1770                 return isset( $this->mRestrictions[$action] )
1771                                 ? $this->mRestrictions[$action]
1772                                 : array();
1773         }
1774
1775         /**
1776          * Is there a version of this page in the deletion archive?
1777          * @return int the number of archived revisions
1778          */
1779         public function isDeleted() {
1780                 $fname = 'Title::isDeleted';
1781                 if ( $this->getNamespace() < 0 ) {
1782                         $n = 0;
1783                 } else {
1784                         $dbr = wfGetDB( DB_SLAVE );
1785                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1786                                 'ar_title' => $this->getDBkey() ), $fname );
1787                         if( $this->getNamespace() == NS_IMAGE ) {
1788                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1789                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1790                         }
1791                 }
1792                 return (int)$n;
1793         }
1794
1795         /**
1796          * Get the article ID for this Title from the link cache,
1797          * adding it if necessary
1798          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1799          *      for update
1800          * @return int the ID
1801          */
1802         public function getArticleID( $flags = 0 ) {
1803                 $linkCache =& LinkCache::singleton();
1804                 if ( $flags & GAID_FOR_UPDATE ) {
1805                         $oldUpdate = $linkCache->forUpdate( true );
1806                         $this->mArticleID = $linkCache->addLinkObj( $this );
1807                         $linkCache->forUpdate( $oldUpdate );
1808                 } else {
1809                         if ( -1 == $this->mArticleID ) {
1810                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1811                         }
1812                 }
1813                 return $this->mArticleID;
1814         }
1815
1816         public function getLatestRevID() {
1817                 if ($this->mLatestID !== false)
1818                         return $this->mLatestID;
1819
1820                 $db = wfGetDB(DB_SLAVE);
1821                 return $this->mLatestID = $db->selectField( 'revision',
1822                         "max(rev_id)",
1823                         array('rev_page' => $this->getArticleID()),
1824                         'Title::getLatestRevID' );
1825         }
1826
1827         /**
1828          * This clears some fields in this object, and clears any associated
1829          * keys in the "bad links" section of the link cache.
1830          *
1831          * - This is called from Article::insertNewArticle() to allow
1832          * loading of the new page_id. It's also called from
1833          * Article::doDeleteArticle()
1834          *
1835          * @param int $newid the new Article ID
1836          */
1837         public function resetArticleID( $newid ) {
1838                 $linkCache =& LinkCache::singleton();
1839                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1840
1841                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1842                 else { $this->mArticleID = $newid; }
1843                 $this->mRestrictionsLoaded = false;
1844                 $this->mRestrictions = array();
1845         }
1846
1847         /**
1848          * Updates page_touched for this page; called from LinksUpdate.php
1849          * @return bool true if the update succeded
1850          */
1851         public function invalidateCache() {
1852                 global $wgUseFileCache;
1853
1854                 if ( wfReadOnly() ) {
1855                         return;
1856                 }
1857
1858                 $dbw = wfGetDB( DB_MASTER );
1859                 $success = $dbw->update( 'page',
1860                         array( /* SET */
1861                                 'page_touched' => $dbw->timestamp()
1862                         ), array( /* WHERE */
1863                                 'page_namespace' => $this->getNamespace() ,
1864                                 'page_title' => $this->getDBkey()
1865                         ), 'Title::invalidateCache'
1866                 );
1867
1868                 if ($wgUseFileCache) {
1869                         $cache = new HTMLFileCache($this);
1870                         @unlink($cache->fileCacheName());
1871                 }
1872
1873                 return $success;
1874         }
1875
1876         /**
1877          * Prefix some arbitrary text with the namespace or interwiki prefix
1878          * of this object
1879          *
1880          * @param string $name the text
1881          * @return string the prefixed text
1882          * @private
1883          */
1884         /* private */ function prefix( $name ) {
1885                 $p = '';
1886                 if ( '' != $this->mInterwiki ) {
1887                         $p = $this->mInterwiki . ':';
1888                 }
1889                 if ( 0 != $this->mNamespace ) {
1890                         $p .= $this->getNsText() . ':';
1891                 }
1892                 return $p . $name;
1893         }
1894
1895         /**
1896          * Secure and split - main initialisation function for this object
1897          *
1898          * Assumes that mDbkeyform has been set, and is urldecoded
1899          * and uses underscores, but not otherwise munged.  This function
1900          * removes illegal characters, splits off the interwiki and
1901          * namespace prefixes, sets the other forms, and canonicalizes
1902          * everything.
1903          * @return bool true on success
1904          */
1905         private function secureAndSplit() {
1906                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1907
1908                 # Initialisation
1909                 static $rxTc = false;
1910                 if( !$rxTc ) {
1911                         # Matching titles will be held as illegal.
1912                         $rxTc = '/' .
1913                                 # Any character not allowed is forbidden...
1914                                 '[^' . Title::legalChars() . ']' .
1915                                 # URL percent encoding sequences interfere with the ability
1916                                 # to round-trip titles -- you can't link to them consistently.
1917                                 '|%[0-9A-Fa-f]{2}' .
1918                                 # XML/HTML character references produce similar issues.
1919                                 '|&[A-Za-z0-9\x80-\xff]+;' .
1920                                 '|&#[0-9]+;' .
1921                                 '|&#x[0-9A-Fa-f]+;' .
1922                                 '/S';
1923                 }
1924
1925                 $this->mInterwiki = $this->mFragment = '';
1926                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1927
1928                 $dbkey = $this->mDbkeyform;
1929
1930                 # Strip Unicode bidi override characters.
1931                 # Sometimes they slip into cut-n-pasted page titles, where the
1932                 # override chars get included in list displays.
1933                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1934                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1935
1936                 # Clean up whitespace
1937                 #
1938                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1939                 $dbkey = trim( $dbkey, '_' );
1940
1941                 if ( '' == $dbkey ) {
1942                         return false;
1943                 }
1944
1945                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1946                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1947                         return false;
1948                 }
1949
1950                 $this->mDbkeyform = $dbkey;
1951
1952                 # Initial colon indicates main namespace rather than specified default
1953                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1954                 if ( ':' == $dbkey{0} ) {
1955                         $this->mNamespace = NS_MAIN;
1956                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1957                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
1958                 }
1959
1960                 # Namespace or interwiki prefix
1961                 $firstPass = true;
1962                 do {
1963                         $m = array();
1964                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1965                                 $p = $m[1];
1966                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
1967                                         # Ordinary namespace
1968                                         $dbkey = $m[2];
1969                                         $this->mNamespace = $ns;
1970                                 } elseif( $this->getInterwikiLink( $p ) ) {
1971                                         if( !$firstPass ) {
1972                                                 # Can't make a local interwiki link to an interwiki link.
1973                                                 # That's just crazy!
1974                                                 return false;
1975                                         }
1976
1977                                         # Interwiki link
1978                                         $dbkey = $m[2];
1979                                         $this->mInterwiki = $wgContLang->lc( $p );
1980
1981                                         # Redundant interwiki prefix to the local wiki
1982                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1983                                                 if( $dbkey == '' ) {
1984                                                         # Can't have an empty self-link
1985                                                         return false;
1986                                                 }
1987                                                 $this->mInterwiki = '';
1988                                                 $firstPass = false;
1989                                                 # Do another namespace split...
1990                                                 continue;
1991                                         }
1992
1993                                         # If there's an initial colon after the interwiki, that also
1994                                         # resets the default namespace
1995                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1996                                                 $this->mNamespace = NS_MAIN;
1997                                                 $dbkey = substr( $dbkey, 1 );
1998                                         }
1999                                 }
2000                                 # If there's no recognized interwiki or namespace,
2001                                 # then let the colon expression be part of the title.
2002                         }
2003                         break;
2004                 } while( true );
2005
2006                 # We already know that some pages won't be in the database!
2007                 #
2008                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2009                         $this->mArticleID = 0;
2010                 }
2011                 $fragment = strstr( $dbkey, '#' );
2012                 if ( false !== $fragment ) {
2013                         $this->setFragment( $fragment );
2014                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2015                         # remove whitespace again: prevents "Foo_bar_#"
2016                         # becoming "Foo_bar_"
2017                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2018                 }
2019
2020                 # Reject illegal characters.
2021                 #
2022                 if( preg_match( $rxTc, $dbkey ) ) {
2023                         return false;
2024                 }
2025
2026                 /**
2027                  * Pages with "/./" or "/../" appearing in the URLs will
2028                  * often be unreachable due to the way web browsers deal
2029                  * with 'relative' URLs. Forbid them explicitly.
2030                  */
2031                 if ( strpos( $dbkey, '.' ) !== false &&
2032                      ( $dbkey === '.' || $dbkey === '..' ||
2033                        strpos( $dbkey, './' ) === 0  ||
2034                        strpos( $dbkey, '../' ) === 0 ||
2035                        strpos( $dbkey, '/./' ) !== false ||
2036                        strpos( $dbkey, '/../' ) !== false ) )
2037                 {
2038                         return false;
2039                 }
2040
2041                 /**
2042                  * Magic tilde sequences? Nu-uh!
2043                  */
2044                 if( strpos( $dbkey, '~~~' ) !== false ) {
2045                         return false;
2046                 }
2047
2048                 /**
2049                  * Limit the size of titles to 255 bytes.
2050                  * This is typically the size of the underlying database field.
2051                  * We make an exception for special pages, which don't need to be stored
2052                  * in the database, and may edge over 255 bytes due to subpage syntax
2053                  * for long titles, e.g. [[Special:Block/Long name]]
2054                  */
2055                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2056                   strlen( $dbkey ) > 512 )
2057                 {
2058                         return false;
2059                 }
2060
2061                 /**
2062                  * Normally, all wiki links are forced to have
2063                  * an initial capital letter so [[foo]] and [[Foo]]
2064                  * point to the same place.
2065                  *
2066                  * Don't force it for interwikis, since the other
2067                  * site might be case-sensitive.
2068                  */
2069                 $this->mUserCaseDBKey = $dbkey;
2070                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2071                         $dbkey = $wgContLang->ucfirst( $dbkey );
2072                 }
2073
2074                 /**
2075                  * Can't make a link to a namespace alone...
2076                  * "empty" local links can only be self-links
2077                  * with a fragment identifier.
2078                  */
2079                 if( $dbkey == '' &&
2080                         $this->mInterwiki == '' &&
2081                         $this->mNamespace != NS_MAIN ) {
2082                         return false;
2083                 }
2084                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2085                 // IP names are not allowed for accounts, and can only be referring to
2086                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2087                 // there are numerous ways to present the same IP. Having sp:contribs scan
2088                 // them all is silly and having some show the edits and others not is
2089                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2090                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2091                         IP::sanitizeIP( $dbkey ) : $dbkey;
2092                 // Any remaining initial :s are illegal.
2093                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2094                         return false;
2095                 }
2096
2097                 # Fill fields
2098                 $this->mDbkeyform = $dbkey;
2099                 $this->mUrlform = wfUrlencode( $dbkey );
2100
2101                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2102
2103                 return true;
2104         }
2105
2106         /**
2107          * Set the fragment for this title
2108          * This is kind of bad, since except for this rarely-used function, Title objects
2109          * are immutable. The reason this is here is because it's better than setting the
2110          * members directly, which is what Linker::formatComment was doing previously.
2111          *
2112          * @param string $fragment text
2113          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
2114          */
2115         public function setFragment( $fragment ) {
2116                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2117         }
2118
2119         /**
2120          * Get a Title object associated with the talk page of this article
2121          * @return Title the object for the talk page
2122          */
2123         public function getTalkPage() {
2124                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2125         }
2126
2127         /**
2128          * Get a title object associated with the subject page of this
2129          * talk page
2130          *
2131          * @return Title the object for the subject page
2132          */
2133         public function getSubjectPage() {
2134                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
2135         }
2136
2137         /**
2138          * Get an array of Title objects linking to this Title
2139          * Also stores the IDs in the link cache.
2140          *
2141          * WARNING: do not use this function on arbitrary user-supplied titles!
2142          * On heavily-used templates it will max out the memory.
2143          *
2144          * @param string $options may be FOR UPDATE
2145          * @return array the Title objects linking here
2146          */
2147         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2148                 $linkCache =& LinkCache::singleton();
2149
2150                 if ( $options ) {
2151                         $db = wfGetDB( DB_MASTER );
2152                 } else {
2153                         $db = wfGetDB( DB_SLAVE );
2154                 }
2155
2156                 $res = $db->select( array( 'page', $table ),
2157                         array( 'page_namespace', 'page_title', 'page_id' ),
2158                         array(
2159                                 "{$prefix}_from=page_id",
2160                                 "{$prefix}_namespace" => $this->getNamespace(),
2161                                 "{$prefix}_title"     => $this->getDBkey() ),
2162                         'Title::getLinksTo',
2163                         $options );
2164
2165                 $retVal = array();
2166                 if ( $db->numRows( $res ) ) {
2167                         while ( $row = $db->fetchObject( $res ) ) {
2168                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2169                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
2170                                         $retVal[] = $titleObj;
2171                                 }
2172                         }
2173                 }
2174                 $db->freeResult( $res );
2175                 return $retVal;
2176         }
2177
2178         /**
2179          * Get an array of Title objects using this Title as a template
2180          * Also stores the IDs in the link cache.
2181          *
2182          * WARNING: do not use this function on arbitrary user-supplied titles!
2183          * On heavily-used templates it will max out the memory.
2184          *
2185          * @param string $options may be FOR UPDATE
2186          * @return array the Title objects linking here
2187          */
2188         public function getTemplateLinksTo( $options = '' ) {
2189                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2190         }
2191
2192         /**
2193          * Get an array of Title objects referring to non-existent articles linked from this page
2194          *
2195          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2196          * @param string $options may be FOR UPDATE
2197          * @return array the Title objects
2198          */
2199         public function getBrokenLinksFrom( $options = '' ) {
2200                 if ( $this->getArticleId() == 0 ) {
2201                         # All links from article ID 0 are false positives
2202                         return array();
2203                 }
2204
2205                 if ( $options ) {
2206                         $db = wfGetDB( DB_MASTER );
2207                 } else {
2208                         $db = wfGetDB( DB_SLAVE );
2209                 }
2210
2211                 $res = $db->safeQuery(
2212                           "SELECT pl_namespace, pl_title
2213                              FROM !
2214                         LEFT JOIN !
2215                                ON pl_namespace=page_namespace
2216                               AND pl_title=page_title
2217                             WHERE pl_from=?
2218                               AND page_namespace IS NULL
2219                                   !",
2220                         $db->tableName( 'pagelinks' ),
2221                         $db->tableName( 'page' ),
2222                         $this->getArticleId(),
2223                         $options );
2224
2225                 $retVal = array();
2226                 if ( $db->numRows( $res ) ) {
2227                         while ( $row = $db->fetchObject( $res ) ) {
2228                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2229                         }
2230                 }
2231                 $db->freeResult( $res );
2232                 return $retVal;
2233         }
2234
2235
2236         /**
2237          * Get a list of URLs to purge from the Squid cache when this
2238          * page changes
2239          *
2240          * @return array the URLs
2241          */
2242         public function getSquidURLs() {
2243                 global $wgContLang;
2244
2245                 $urls = array(
2246                         $this->getInternalURL(),
2247                         $this->getInternalURL( 'action=history' )
2248                 );
2249
2250                 // purge variant urls as well
2251                 if($wgContLang->hasVariants()){
2252                         $variants = $wgContLang->getVariants();
2253                         foreach($variants as $vCode){
2254                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2255                                 $urls[] = $this->getInternalURL('',$vCode);
2256                         }
2257                 }
2258
2259                 return $urls;
2260         }
2261
2262         public function purgeSquid() {
2263                 global $wgUseSquid;
2264                 if ( $wgUseSquid ) {
2265                         $urls = $this->getSquidURLs();
2266                         $u = new SquidUpdate( $urls );
2267                         $u->doUpdate();
2268                 }
2269         }
2270
2271         /**
2272          * Move this page without authentication
2273          * @param Title &$nt the new page Title
2274          */
2275         public function moveNoAuth( &$nt ) {
2276                 return $this->moveTo( $nt, false );
2277         }
2278
2279         /**
2280          * Check whether a given move operation would be valid.
2281          * Returns true if ok, or a message key string for an error message
2282          * if invalid. (Scarrrrry ugly interface this.)
2283          * @param Title &$nt the new title
2284          * @param bool $auth indicates whether $wgUser's permissions
2285          *      should be checked
2286          * @return mixed true on success, message name on failure
2287          */
2288         public function isValidMoveOperation( &$nt, $auth = true ) {
2289                 if( !$this or !$nt ) {
2290                         return 'badtitletext';
2291                 }
2292                 if( $this->equals( $nt ) ) {
2293                         return 'selfmove';
2294                 }
2295                 if( !$this->isMovable() || !$nt->isMovable() ) {
2296                         return 'immobile_namespace';
2297                 }
2298
2299                 $oldid = $this->getArticleID();
2300                 $newid = $nt->getArticleID();
2301
2302                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2303                         return 'articleexists';
2304                 }
2305                 if ( ( '' == $this->getDBkey() ) ||
2306                          ( !$oldid ) ||
2307                      ( '' == $nt->getDBkey() ) ) {
2308                         return 'badarticleerror';
2309                 }
2310
2311                 if ( $auth ) {
2312                         global $wgUser;
2313                         $errors = $this->getUserPermissionsErrors('move', $wgUser);
2314                         if($errors !== array())
2315                                 return $errors[0][0];
2316                 }
2317
2318                 global $wgUser;
2319                 $err = null;
2320                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err ) ) ) {
2321                         return 'hookaborted';
2322                 }
2323
2324                 # The move is allowed only if (1) the target doesn't exist, or
2325                 # (2) the target is a redirect to the source, and has no history
2326                 # (so we can undo bad moves right after they're done).
2327
2328                 if ( 0 != $newid ) { # Target exists; check for validity
2329                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2330                                 return 'articleexists';
2331                         }
2332                 } else {
2333                         $tp = $nt->getTitleProtection();
2334                         if ( $tp and !$wgUser->isAllowed( $tp['pt_create_perm'] ) ) {
2335                                 return 'cantmove-titleprotected';
2336                         }
2337                 }
2338                 return true;
2339         }
2340
2341         /**
2342          * Move a title to a new location
2343          * @param Title &$nt the new title
2344          * @param bool $auth indicates whether $wgUser's permissions
2345          *      should be checked
2346          * @param string $reason The reason for the move
2347          * @param bool $createRedirect Whether to create a redirect from the old title to the new title.
2348          *  Ignored if the user doesn't have the suppressredirect right.
2349          * @return mixed true on success, message name on failure
2350          */
2351         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2352                 $err = $this->isValidMoveOperation( $nt, $auth );
2353                 if( is_string( $err ) ) {
2354                         return $err;
2355                 }
2356
2357                 $pageid = $this->getArticleID();
2358                 if( $nt->exists() ) {
2359                         $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2360                         $pageCountChange = ($createRedirect ? 0 : -1);
2361                 } else { # Target didn't exist, do normal move.
2362                         $this->moveToNewTitle( $nt, $reason, $createRedirect );
2363                         $pageCountChange = ($createRedirect ? 1 : 0);
2364                 }
2365                 $redirid = $this->getArticleID();
2366
2367                 // Category memberships include a sort key which may be customized.
2368                 // If it's left as the default (the page title), we need to update
2369                 // the sort key to match the new title.
2370                 //
2371                 // Be careful to avoid resetting cl_timestamp, which may disturb
2372                 // time-based lists on some sites.
2373                 //
2374                 // Warning -- if the sort key is *explicitly* set to the old title,
2375                 // we can't actually distinguish it from a default here, and it'll
2376                 // be set to the new title even though it really shouldn't.
2377                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2378                 $dbw = wfGetDB( DB_MASTER );
2379                 $dbw->update( 'categorylinks',
2380                         array(
2381                                 'cl_sortkey' => $nt->getPrefixedText(),
2382                                 'cl_timestamp=cl_timestamp' ),
2383                         array(
2384                                 'cl_from' => $pageid,
2385                                 'cl_sortkey' => $this->getPrefixedText() ),
2386                         __METHOD__ );
2387
2388                 # Update watchlists
2389
2390                 $oldnamespace = $this->getNamespace() & ~1;
2391                 $newnamespace = $nt->getNamespace() & ~1;
2392                 $oldtitle = $this->getDBkey();
2393                 $newtitle = $nt->getDBkey();
2394
2395                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2396                         WatchedItem::duplicateEntries( $this, $nt );
2397                 }
2398
2399                 # Update search engine
2400                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2401                 $u->doUpdate();
2402                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2403                 $u->doUpdate();
2404
2405                 # Update site_stats
2406                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2407                         # No longer a content page
2408                         # Not viewed, edited, removing
2409                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2410                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2411                         # Now a content page
2412                         # Not viewed, edited, adding
2413                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2414                 } elseif( $pageCountChange ) {
2415                         # Redirect added
2416                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2417                 } else {
2418                         # Nothing special
2419                         $u = false;
2420                 }
2421                 if( $u )
2422                         $u->doUpdate();
2423                 # Update message cache for interface messages
2424                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2425                         global $wgMessageCache;
2426                         $newarticle = new Article( $nt );
2427                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2428                 }
2429
2430                 global $wgUser;
2431                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2432                 return true;
2433         }
2434
2435         /**
2436          * Move page to a title which is at present a redirect to the
2437          * source page
2438          *
2439          * @param Title &$nt the page to move to, which should currently
2440          *      be a redirect
2441          * @param string $reason The reason for the move
2442          * @param bool $createRedirect Whether to leave a redirect at the old title.
2443          *  Ignored if the user doesn't have the suppressredirect right
2444          */
2445         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2446                 global $wgUseSquid, $wgUser;
2447                 $fname = 'Title::moveOverExistingRedirect';
2448                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2449
2450                 if ( $reason ) {
2451                         $comment .= ": $reason";
2452                 }
2453
2454                 $now = wfTimestampNow();
2455                 $newid = $nt->getArticleID();
2456                 $oldid = $this->getArticleID();
2457                 $dbw = wfGetDB( DB_MASTER );
2458                 $linkCache =& LinkCache::singleton();
2459
2460                 # Delete the old redirect. We don't save it to history since
2461                 # by definition if we've got here it's rather uninteresting.
2462                 # We have to remove it so that the next step doesn't trigger
2463                 # a conflict on the unique namespace+title index...
2464                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2465
2466                 # Save a null revision in the page's history notifying of the move
2467                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2468                 $nullRevId = $nullRevision->insertOn( $dbw );
2469
2470                 # Change the name of the target page:
2471                 $dbw->update( 'page',
2472                         /* SET */ array(
2473                                 'page_touched'   => $dbw->timestamp($now),
2474                                 'page_namespace' => $nt->getNamespace(),
2475                                 'page_title'     => $nt->getDBkey(),
2476                                 'page_latest'    => $nullRevId,
2477                         ),
2478                         /* WHERE */ array( 'page_id' => $oldid ),
2479                         $fname
2480                 );
2481                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2482
2483                 # Recreate the redirect, this time in the other direction.
2484                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2485                 {
2486                         $mwRedir = MagicWord::get( 'redirect' );
2487                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2488                         $redirectArticle = new Article( $this );
2489                         $newid = $redirectArticle->insertOn( $dbw );
2490                         $redirectRevision = new Revision( array(
2491                                 'page'    => $newid,
2492                                 'comment' => $comment,
2493                                 'text'    => $redirectText ) );
2494                         $redirectRevision->insertOn( $dbw );
2495                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2496                         $linkCache->clearLink( $this->getPrefixedDBkey() );
2497
2498                         # Now, we record the link from the redirect to the new title.
2499                         # It should have no other outgoing links...
2500                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2501                         $dbw->insert( 'pagelinks',
2502                                 array(
2503                                         'pl_from'      => $newid,
2504                                         'pl_namespace' => $nt->getNamespace(),
2505                                         'pl_title'     => $nt->getDBkey() ),
2506                                 $fname );
2507                 }
2508
2509                 # Log the move
2510                 $log = new LogPage( 'move' );
2511                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2512
2513                 # Purge squid
2514                 if ( $wgUseSquid ) {
2515                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2516                         $u = new SquidUpdate( $urls );
2517                         $u->doUpdate();
2518                 }
2519         }
2520
2521         /**
2522          * Move page to non-existing title.
2523          * @param Title &$nt the new Title
2524          * @param string $reason The reason for the move
2525          * @param bool $createRedirect Whether to create a redirect from the old title to the new title
2526          *  Ignored if the user doesn't have the suppressredirect right
2527          */
2528         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2529                 global $wgUseSquid, $wgUser;
2530                 $fname = 'MovePageForm::moveToNewTitle';
2531                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2532                 if ( $reason ) {
2533                         $comment .= ": $reason";
2534                 }
2535
2536                 $newid = $nt->getArticleID();
2537                 $oldid = $this->getArticleID();
2538                 $dbw = wfGetDB( DB_MASTER );
2539                 $now = $dbw->timestamp();
2540                 $linkCache =& LinkCache::singleton();
2541
2542                 # Save a null revision in the page's history notifying of the move
2543                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2544                 $nullRevId = $nullRevision->insertOn( $dbw );
2545
2546                 # Rename cur entry
2547                 $dbw->update( 'page',
2548                         /* SET */ array(
2549                                 'page_touched'   => $now,
2550                                 'page_namespace' => $nt->getNamespace(),
2551                                 'page_title'     => $nt->getDBkey(),
2552                                 'page_latest'    => $nullRevId,
2553                         ),
2554                         /* WHERE */ array( 'page_id' => $oldid ),
2555                         $fname
2556                 );
2557
2558                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2559
2560                 if($createRedirect || !$wgUser->isAllowed('suppressredirect'))
2561                 {
2562                         # Insert redirect
2563                         $mwRedir = MagicWord::get( 'redirect' );
2564                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2565                         $redirectArticle = new Article( $this );
2566                         $newid = $redirectArticle->insertOn( $dbw );
2567                         $redirectRevision = new Revision( array(
2568                                 'page'    => $newid,
2569                                 'comment' => $comment,
2570                                 'text'    => $redirectText ) );
2571                         $redirectRevision->insertOn( $dbw );
2572                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2573                         $linkCache->clearLink( $this->getPrefixedDBkey() );
2574                         # Record the just-created redirect's linking to the page
2575                         $dbw->insert( 'pagelinks',
2576                                 array(
2577                                         'pl_from'      => $newid,
2578                                         'pl_namespace' => $nt->getNamespace(),
2579                                         'pl_title'     => $nt->getDBkey() ),
2580                                 $fname );
2581                 }
2582
2583                 # Log the move
2584                 $log = new LogPage( 'move' );
2585                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2586
2587                 # Purge caches as per article creation
2588                 Article::onArticleCreate( $nt );
2589
2590                 # Purge old title from squid
2591                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2592                 $this->purgeSquid();
2593         }
2594
2595         /**
2596          * Checks if $this can be moved to a given Title
2597          * - Selects for update, so don't call it unless you mean business
2598          *
2599          * @param Title &$nt the new title to check
2600          */
2601         public function isValidMoveTarget( $nt ) {
2602
2603                 $fname = 'Title::isValidMoveTarget';
2604                 $dbw = wfGetDB( DB_MASTER );
2605
2606                 # Is it a redirect?
2607                 $id  = $nt->getArticleID();
2608                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2609                         array( 'page_is_redirect','old_text','old_flags' ),
2610                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2611                         $fname, 'FOR UPDATE' );
2612
2613                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2614                         # Not a redirect
2615                         wfDebug( __METHOD__ . ": not a redirect\n" );
2616                         return false;
2617                 }
2618                 $text = Revision::getRevisionText( $obj );
2619
2620                 # Does the redirect point to the source?
2621                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2622                 $m = array();
2623                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2624                         $redirTitle = Title::newFromText( $m[1] );
2625                         if( !is_object( $redirTitle ) ||
2626                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2627                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2628                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2629                                 return false;
2630                         }
2631                 } else {
2632                         # Fail safe
2633                         wfDebug( __METHOD__ . ": failsafe\n" );
2634                         return false;
2635                 }
2636
2637                 # Does the article have a history?
2638                 $row = $dbw->selectRow( array( 'page', 'revision'),
2639                         array( 'rev_id' ),
2640                         array( 'page_namespace' => $nt->getNamespace(),
2641                                 'page_title' => $nt->getDBkey(),
2642                                 'page_id=rev_page AND page_latest != rev_id'
2643                         ), $fname, 'FOR UPDATE'
2644                 );
2645
2646                 # Return true if there was no history
2647                 return $row === false;
2648         }
2649
2650         /**
2651          * Can this title be added to a user's watchlist?
2652          *
2653          * @return bool
2654          */
2655         public function isWatchable() {
2656                 return !$this->isExternal()
2657                         && Namespace::isWatchable( $this->getNamespace() );
2658         }
2659
2660         /**
2661          * Get categories to which this Title belongs and return an array of
2662          * categories' names.
2663          *
2664          * @return array an array of parents in the form:
2665          *      $parent => $currentarticle
2666          */
2667         public function getParentCategories() {
2668                 global $wgContLang;
2669
2670                 $titlekey = $this->getArticleId();
2671                 $dbr = wfGetDB( DB_SLAVE );
2672                 $categorylinks = $dbr->tableName( 'categorylinks' );
2673
2674                 # NEW SQL
2675                 $sql = "SELECT * FROM $categorylinks"
2676                      ." WHERE cl_from='$titlekey'"
2677                          ." AND cl_from <> '0'"
2678                          ." ORDER BY cl_sortkey";
2679
2680                 $res = $dbr->query ( $sql ) ;
2681
2682                 if($dbr->numRows($res) > 0) {
2683                         while ( $x = $dbr->fetchObject ( $res ) )
2684                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2685                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2686                         $dbr->freeResult ( $res ) ;
2687                 } else {
2688                         $data = array();
2689                 }
2690                 return $data;
2691         }
2692
2693         /**
2694          * Get a tree of parent categories
2695          * @param array $children an array with the children in the keys, to check for circular refs
2696          * @return array
2697          */
2698         public function getParentCategoryTree( $children = array() ) {
2699                 $parents = $this->getParentCategories();
2700
2701                 if($parents != '') {
2702                         foreach($parents as $parent => $current) {
2703                                 if ( array_key_exists( $parent, $children ) ) {
2704                                         # Circular reference
2705                                         $stack[$parent] = array();
2706                                 } else {
2707                                         $nt = Title::newFromText($parent);
2708                                         if ( $nt ) {
2709                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2710                                         }
2711                                 }
2712                         }
2713                         return $stack;
2714                 } else {
2715                         return array();
2716                 }
2717         }
2718
2719
2720         /**
2721          * Get an associative array for selecting this title from
2722          * the "page" table
2723          *
2724          * @return array
2725          */
2726         public function pageCond() {
2727                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2728         }
2729
2730         /**
2731          * Get the revision ID of the previous revision
2732          *
2733          * @param integer $revision  Revision ID. Get the revision that was before this one.
2734          * @return integer $oldrevision|false
2735          */
2736         public function getPreviousRevisionID( $revision ) {
2737                 $dbr = wfGetDB( DB_SLAVE );
2738                 return $dbr->selectField( 'revision', 'rev_id',
2739                         'rev_page=' . intval( $this->getArticleId() ) .
2740                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2741         }
2742
2743         /**
2744          * Get the revision ID of the next revision
2745          *
2746          * @param integer $revision  Revision ID. Get the revision that was after this one.
2747          * @return integer $oldrevision|false
2748          */
2749         public function getNextRevisionID( $revision ) {
2750                 $dbr = wfGetDB( DB_SLAVE );
2751                 return $dbr->selectField( 'revision', 'rev_id',
2752                         'rev_page=' . intval( $this->getArticleId() ) .
2753                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2754         }
2755
2756         /**
2757          * Get the number of revisions between the given revision IDs.
2758          *
2759          * @param integer $old  Revision ID.
2760          * @param integer $new  Revision ID.
2761          * @return integer  Number of revisions between these IDs.
2762          */
2763         public function countRevisionsBetween( $old, $new ) {
2764                 $dbr = wfGetDB( DB_SLAVE );
2765                 return $dbr->selectField( 'revision', 'count(*)',
2766                         'rev_page = ' . intval( $this->getArticleId() ) .
2767                         ' AND rev_id > ' . intval( $old ) .
2768                         ' AND rev_id < ' . intval( $new ) );
2769         }
2770
2771         /**
2772          * Compare with another title.
2773          *
2774          * @param Title $title
2775          * @return bool
2776          */
2777         public function equals( $title ) {
2778                 // Note: === is necessary for proper matching of number-like titles.
2779                 return $this->getInterwiki() === $title->getInterwiki()
2780                         && $this->getNamespace() == $title->getNamespace()
2781                         && $this->getDBkey() === $title->getDBkey();
2782         }
2783
2784         /**
2785          * Return a string representation of this title
2786          *
2787          * @return string
2788          */
2789         public function __toString() {
2790                 return $this->getPrefixedText();
2791         }
2792
2793         /**
2794          * Check if page exists
2795          * @return bool
2796          */
2797         public function exists() {
2798                 return $this->getArticleId() != 0;
2799         }
2800
2801         /**
2802          * Do we know that this title definitely exists, or should we otherwise
2803          * consider that it exists?
2804          *
2805          * @return bool
2806          */
2807         public function isAlwaysKnown() {
2808                 // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
2809                 // the full l10n of that language to be loaded. That takes much memory and
2810                 // isn't needed. So we strip the language part away.
2811                 // Also, extension messages which are not loaded, are shown as red, because
2812                 // we don't call MessageCache::loadAllMessages.
2813                 list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
2814                 return $this->isExternal()
2815                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2816                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $basename ) );
2817         }
2818
2819         /**
2820          * Update page_touched timestamps and send squid purge messages for
2821          * pages linking to this title. May be sent to the job queue depending
2822          * on the number of links. Typically called on create and delete.
2823          */
2824         public function touchLinks() {
2825                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2826                 $u->doUpdate();
2827
2828                 if ( $this->getNamespace() == NS_CATEGORY ) {
2829                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2830                         $u->doUpdate();
2831                 }
2832         }
2833
2834         /**
2835          * Get the last touched timestamp
2836          */
2837         public function getTouched() {
2838                 $dbr = wfGetDB( DB_SLAVE );
2839                 $touched = $dbr->selectField( 'page', 'page_touched',
2840                         array(
2841                                 'page_namespace' => $this->getNamespace(),
2842                                 'page_title' => $this->getDBkey()
2843                         ), __METHOD__
2844                 );
2845                 return $touched;
2846         }
2847
2848         public function trackbackURL() {
2849                 global $wgTitle, $wgScriptPath, $wgServer;
2850
2851                 return "$wgServer$wgScriptPath/trackback.php?article="
2852                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2853         }
2854
2855         public function trackbackRDF() {
2856                 $url = htmlspecialchars($this->getFullURL());
2857                 $title = htmlspecialchars($this->getText());
2858                 $tburl = $this->trackbackURL();
2859
2860                 return "
2861 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2862          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2863          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2864 <rdf:Description
2865    rdf:about=\"$url\"
2866    dc:identifier=\"$url\"
2867    dc:title=\"$title\"
2868    trackback:ping=\"$tburl\" />
2869 </rdf:RDF>";
2870         }
2871
2872         /**
2873          * Generate strings used for xml 'id' names in monobook tabs
2874          * @return string
2875          */
2876         public function getNamespaceKey() {
2877                 global $wgContLang;
2878                 switch ($this->getNamespace()) {
2879                         case NS_MAIN:
2880                         case NS_TALK:
2881                                 return 'nstab-main';
2882                         case NS_USER:
2883                         case NS_USER_TALK:
2884                                 return 'nstab-user';
2885                         case NS_MEDIA:
2886                                 return 'nstab-media';
2887                         case NS_SPECIAL:
2888                                 return 'nstab-special';
2889                         case NS_PROJECT:
2890                         case NS_PROJECT_TALK:
2891                                 return 'nstab-project';
2892                         case NS_IMAGE:
2893                         case NS_IMAGE_TALK:
2894                                 return 'nstab-image';
2895                         case NS_MEDIAWIKI:
2896                         case NS_MEDIAWIKI_TALK:
2897                                 return 'nstab-mediawiki';
2898                         case NS_TEMPLATE:
2899                         case NS_TEMPLATE_TALK:
2900                                 return 'nstab-template';
2901                         case NS_HELP:
2902                         case NS_HELP_TALK:
2903                                 return 'nstab-help';
2904                         case NS_CATEGORY:
2905                         case NS_CATEGORY_TALK:
2906                                 return 'nstab-category';
2907                         default:
2908                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2909                 }
2910         }
2911
2912         /**
2913          * Returns true if this title resolves to the named special page
2914          * @param string $name The special page name
2915          */
2916         public function isSpecial( $name ) {
2917                 if ( $this->getNamespace() == NS_SPECIAL ) {
2918                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2919                         if ( $name == $thisName ) {
2920                                 return true;
2921                         }
2922                 }
2923                 return false;
2924         }
2925
2926         /**
2927          * If the Title refers to a special page alias which is not the local default,
2928          * returns a new Title which points to the local default. Otherwise, returns $this.
2929          */
2930         public function fixSpecialName() {
2931                 if ( $this->getNamespace() == NS_SPECIAL ) {
2932                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2933                         if ( $canonicalName ) {
2934                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2935                                 if ( $localName != $this->mDbkeyform ) {
2936                                         return Title::makeTitle( NS_SPECIAL, $localName );
2937                                 }
2938                         }
2939                 }
2940                 return $this;
2941         }
2942
2943         /**
2944          * Is this Title in a namespace which contains content?
2945          * In other words, is this a content page, for the purposes of calculating
2946          * statistics, etc?
2947          *
2948          * @return bool
2949          */
2950         public function isContentPage() {
2951                 return Namespace::isContent( $this->getNamespace() );
2952         }
2953
2954 }