includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 if ( !class_exists( 'UtfNormal' ) ) {
   8         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9 }
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13
  14 /**
  15  * Constants for pr_cascade bitfield
  16  */
  17 define( 'CASCADE', 1 );
  18
  19 /**
  20  * Represents a title within MediaWiki.
  21  * Optionally may contain an interwiki designation or namespace.
  22  * @note This class can fetch various kinds of data from the database;
  23  *       however, it does so inefficiently.
  24  */
  25 class Title {
  26         /** @name Static cache variables */
  27         //@{
  28         static private $titleCache=array();
  29         static private $interwikiCache=array();
  30         //@}
  31
  32         /**
  33          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  34          * commonly used titles. On a batch operation this can become a memory leak
  35          * if not bounded. After hitting this many titles reset the cache.
  36          */
  37         const CACHE_MAX = 1000;
  38
  39
  40         /**
  41          * @name Private member variables
  42          * Please use the accessor functions instead.
  43          * @private
  44          */
  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 = NS_MAIN;        ///< 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 = -1;             ///< Article ID, fetched from the link cache on demand
  55         var $mLatestID = false;           ///< ID of most recent revision
  56         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  57         var $mOldRestrictions = false;
  58         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  59         var $mRestrictionsExpiry = array();       ///< When do the restrictions on this page expire?
  60         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  61         var $mCascadeSources;  ///< Where are the cascading restrictions coming from on this page?
  62         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  63         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  64         # Don't change the following default, NS_MAIN is hardcoded in several
  65         # places.  See bug 696.
  66         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  67                                           # Zero except in {{transclusion}} tags
  68         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  69         var $mLength = -1;                ///< The page length, 0 for special pages
  70         var $mRedirect = null;            ///< Is the article at this title a redirect?
  71         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  72         var $mBacklinkCache = null; ///< Cache of links to this title
  73         //@}
  74
  75
  76         /**
  77          * Constructor
  78          * @private
  79          */
  80         /* private */ function __construct() {}
  81
  82         /**
  83          * Create a new Title from a prefixed DB key
  84          * @param $key \type{\string} The database key, which has underscores
  85          *      instead of spaces, possibly including namespace and
  86          *      interwiki prefixes
  87          * @return \type{Title} the new object, or NULL on an error
  88          */
  89         public static function newFromDBkey( $key ) {
  90                 $t = new Title();
  91                 $t->mDbkeyform = $key;
  92                 if( $t->secureAndSplit() )
  93                         return $t;
  94                 else
  95                         return NULL;
  96         }
  97
  98         /**
  99          * Create a new Title from text, such as what one would find in a link. De-
 100          * codes any HTML entities in the text.
 101          *
 102          * @param $text             string  The link text; spaces, prefixes, and an
 103          *   initial ':' indicating the main namespace are accepted.
 104          * @param $defaultNamespace int     The namespace to use if none is speci-
 105          *   fied by a prefix.  If you want to force a specific namespace even if
 106          *   $text might begin with a namespace prefix, use makeTitle() or
 107          *   makeTitleSafe().
 108          * @return Title  The new object, or null on an error.
 109          */
 110         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 111                 if( is_object( $text ) ) {
 112                         throw new MWException( 'Title::newFromText given an object' );
 113                 }
 114
 115                 /**
 116                  * Wiki pages often contain multiple links to the same page.
 117                  * Title normalization and parsing can become expensive on
 118                  * pages with many links, so we can save a little time by
 119                  * caching them.
 120                  *
 121                  * In theory these are value objects and won't get changed...
 122                  */
 123                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 124                         return Title::$titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t = new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 static $cachedcount = 0 ;
 137                 if( $t->secureAndSplit() ) {
 138                         if( $defaultNamespace == NS_MAIN ) {
 139                                 if( $cachedcount >= self::CACHE_MAX ) {
 140                                         # Avoid memory leaks on mass operations...
 141                                         Title::$titleCache = array();
 142                                         $cachedcount=0;
 143                                 }
 144                                 $cachedcount++;
 145                                 Title::$titleCache[$text] =& $t;
 146                         }
 147                         return $t;
 148                 } else {
 149                         $ret = NULL;
 150                         return $ret;
 151                 }
 152         }
 153
 154         /**
 155          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 156          *
 157          * Example of wrong and broken code:
 158          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 159          *
 160          * Example of right code:
 161          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 162          *
 163          * Create a new Title from URL-encoded text. Ensures that
 164          * the given title's length does not exceed the maximum.
 165          * @param $url \type{\string} the title, as might be taken from a URL
 166          * @return \type{Title} the new object, or NULL on an error
 167          */
 168         public static function newFromURL( $url ) {
 169                 global $wgLegalTitleChars;
 170                 $t = new Title();
 171
 172                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 173                 # but some URLs used it as a space replacement and they still come
 174                 # from some external search tools.
 175                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 176                         $url = str_replace( '+', ' ', $url );
 177                 }
 178
 179                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 180                 if( $t->secureAndSplit() ) {
 181                         return $t;
 182                 } else {
 183                         return NULL;
 184                 }
 185         }
 186
 187         /**
 188          * Create a new Title from an article ID
 189          *
 190          * @param $id \type{\int} the page_id corresponding to the Title to create
 191          * @param $flags \type{\int} use GAID_FOR_UPDATE to use master
 192          * @return \type{Title} the new object, or NULL on an error
 193          */
 194         public static function newFromID( $id, $flags = 0 ) {
 195                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 196                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 197                 if( $row !== false ) {
 198                         $title = Title::newFromRow( $row );
 199                 } else {
 200                         $title = NULL;
 201                 }
 202                 return $title;
 203         }
 204
 205         /**
 206          * Make an array of titles from an array of IDs
 207          * @param $ids \type{\arrayof{\int}} Array of IDs
 208          * @return \type{\arrayof{Title}} Array of Titles
 209          */
 210         public static function newFromIDs( $ids ) {
 211                 if ( !count( $ids ) ) {
 212                         return array();
 213                 }
 214                 $dbr = wfGetDB( DB_SLAVE );
 215                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 216                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 217
 218                 $titles = array();
 219                 foreach( $res as $row ) {
 220                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 221                 }
 222                 return $titles;
 223         }
 224
 225         /**
 226          * Make a Title object from a DB row
 227          * @param $row \type{Row} (needs at least page_title,page_namespace)
 228          * @return \type{Title} corresponding Title
 229          */
 230         public static function newFromRow( $row ) {
 231                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 232
 233                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 234                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 235                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 236                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 237
 238                 return $t;
 239         }
 240
 241         /**
 242          * Create a new Title from a namespace index and a DB key.
 243          * It's assumed that $ns and $title are *valid*, for instance when
 244          * they came directly from the database or a special page name.
 245          * For convenience, spaces are converted to underscores so that
 246          * eg user_text fields can be used directly.
 247          *
 248          * @param $ns \type{\int} the namespace of the article
 249          * @param $title \type{\string} the unprefixed database key form
 250          * @param $fragment \type{\string} The link fragment (after the "#")
 251          * @return \type{Title} the new object
 252          */
 253         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 254                 $t = new Title();
 255                 $t->mInterwiki = '';
 256                 $t->mFragment = $fragment;
 257                 $t->mNamespace = $ns = intval( $ns );
 258                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 259                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 260                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 261                 $t->mTextform = str_replace( '_', ' ', $title );
 262                 return $t;
 263         }
 264
 265         /**
 266          * Create a new Title from a namespace index and a DB key.
 267          * The parameters will be checked for validity, which is a bit slower
 268          * than makeTitle() but safer for user-provided data.
 269          *
 270          * @param $ns \type{\int} the namespace of the article
 271          * @param $title \type{\string} the database key form
 272          * @param $fragment \type{\string} The link fragment (after the "#")
 273          * @return \type{Title} the new object, or NULL on an error
 274          */
 275         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 276                 $t = new Title();
 277                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 278                 if( $t->secureAndSplit() ) {
 279                         return $t;
 280                 } else {
 281                         return NULL;
 282                 }
 283         }
 284
 285         /**
 286          * Create a new Title for the Main Page
 287          * @return \type{Title} the new object
 288          */
 289         public static function newMainPage() {
 290                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 291                 // Don't give fatal errors if the message is broken
 292                 if ( !$title ) {
 293                         $title = Title::newFromText( 'Main Page' );
 294                 }
 295                 return $title;
 296         }
 297
 298         /**
 299          * Extract a redirect destination from a string and return the
 300          * Title, or null if the text doesn't contain a valid redirect
 301          * This will only return the very next target, useful for
 302          * the redirect table and other checks that don't need full recursion
 303          *
 304          * @param $text \type{\string} Text with possible redirect
 305          * @return \type{Title} The corresponding Title
 306          */
 307         public static function newFromRedirect( $text ) {
 308                 return self::newFromRedirectInternal( $text );
 309         }
 310
 311         /**
 312          * Extract a redirect destination from a string and return the
 313          * Title, or null if the text doesn't contain a valid redirect
 314          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 315          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 316          *
 317          * @param $text \type{\string} Text with possible redirect
 318          * @return \type{Title} The corresponding Title
 319          */
 320         public static function newFromRedirectRecurse( $text ) {
 321                 $titles = self::newFromRedirectArray( $text );
 322                 return $titles ? array_pop( $titles ) : null;
 323         }
 324
 325         /**
 326          * Extract a redirect destination from a string and return an
 327          * array of Titles, or null if the text doesn't contain a valid redirect
 328          * The last element in the array is the final destination after all redirects
 329          * have been resolved (up to $wgMaxRedirects times)
 330          *
 331          * @param $text \type{\string} Text with possible redirect
 332          * @return \type{\array} Array of Titles, with the destination last
 333          */
 334         public static function newFromRedirectArray( $text ) {
 335                 global $wgMaxRedirects;
 336                 // are redirects disabled?
 337                 if( $wgMaxRedirects < 1 )
 338                         return null;
 339                 $title = self::newFromRedirectInternal( $text );
 340                 if( is_null( $title ) )
 341                         return null;
 342                 // recursive check to follow double redirects
 343                 $recurse = $wgMaxRedirects;
 344                 $titles = array( $title );
 345                 while( --$recurse > 0 ) {
 346                         if( $title->isRedirect() ) {
 347                                 $article = new Article( $title, 0 );
 348                                 $newtitle = $article->getRedirectTarget();
 349                         } else {
 350                                 break;
 351                         }
 352                         // Redirects to some special pages are not permitted
 353                         if( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 354                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 355                                 $title = $newtitle;
 356                                 $titles[] = $newtitle;
 357                         } else {
 358                                 break;
 359                         }
 360                 }
 361                 return $titles;
 362         }
 363
 364         /**
 365          * Really extract the redirect destination
 366          * Do not call this function directly, use one of the newFromRedirect* functions above
 367          *
 368          * @param $text \type{\string} Text with possible redirect
 369          * @return \type{Title} The corresponding Title
 370          */
 371         protected static function newFromRedirectInternal( $text ) {
 372                 $redir = MagicWord::get( 'redirect' );
 373                 $text = trim($text);
 374                 if( $redir->matchStartAndRemove( $text ) ) {
 375                         // Extract the first link and see if it's usable
 376                         // Ensure that it really does come directly after #REDIRECT
 377                         // Some older redirects included a colon, so don't freak about that!
 378                         $m = array();
 379                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 380                                 // Strip preceding colon used to "escape" categories, etc.
 381                                 // and URL-decode links
 382                                 if( strpos( $m[1], '%' ) !== false ) {
 383                                         // Match behavior of inline link parsing here;
 384                                         // don't interpret + as " " most of the time!
 385                                         // It might be safe to just use rawurldecode instead, though.
 386                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 387                                 }
 388                                 $title = Title::newFromText( $m[1] );
 389                                 // If the title is a redirect to bad special pages or is invalid, return null
 390                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 391                                         return null;
 392                                 }
 393                                 return $title;
 394                         }
 395                 }
 396                 return null;
 397         }
 398
 399 #----------------------------------------------------------------------------
 400 #       Static functions
 401 #----------------------------------------------------------------------------
 402
 403         /**
 404          * Get the prefixed DB key associated with an ID
 405          * @param $id \type{\int} the page_id of the article
 406          * @return \type{Title} an object representing the article, or NULL
 407          *      if no such article was found
 408          */
 409         public static function nameOf( $id ) {
 410                 $dbr = wfGetDB( DB_SLAVE );
 411
 412                 $s = $dbr->selectRow( 'page',
 413                         array( 'page_namespace','page_title' ),
 414                         array( 'page_id' => $id ),
 415                         __METHOD__ );
 416                 if ( $s === false ) { return NULL; }
 417
 418                 $n = self::makeName( $s->page_namespace, $s->page_title );
 419                 return $n;
 420         }
 421
 422         /**
 423          * Get a regex character class describing the legal characters in a link
 424          * @return \type{\string} the list of characters, not delimited
 425          */
 426         public static function legalChars() {
 427                 global $wgLegalTitleChars;
 428                 return $wgLegalTitleChars;
 429         }
 430
 431         /**
 432          * Get a string representation of a title suitable for
 433          * including in a search index
 434          *
 435          * @param $ns \type{\int} a namespace index
 436          * @param $title \type{\string} text-form main part
 437          * @return \type{\string} a stripped-down title string ready for the
 438          *      search index
 439          */
 440         public static function indexTitle( $ns, $title ) {
 441                 global $wgContLang;
 442
 443                 $lc = SearchEngine::legalSearchChars() . '&#;';
 444                 $t = $wgContLang->stripForSearch( $title );
 445                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 446                 $t = $wgContLang->lc( $t );
 447
 448                 # Handle 's, s'
 449                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 450                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 451
 452                 $t = preg_replace( "/\\s+/", ' ', $t );
 453
 454                 if ( $ns == NS_FILE ) {
 455                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 456                 }
 457                 return trim( $t );
 458         }
 459
 460         /**
 461          * Make a prefixed DB key from a DB key and a namespace index
 462          * @param $ns \type{\int} numerical representation of the namespace
 463          * @param $title \type{\string} the DB key form the title
 464          * @param $fragment \type{\string} The link fragment (after the "#")
 465          * @return \type{\string} the prefixed form of the title
 466          */
 467         public static function makeName( $ns, $title, $fragment = '' ) {
 468                 global $wgContLang;
 469
 470                 $namespace = $wgContLang->getNsText( $ns );
 471                 $name = $namespace == '' ? $title : "$namespace:$title";
 472                 if ( strval( $fragment ) != '' ) {
 473                         $name .= '#' . $fragment;
 474                 }
 475                 return $name;
 476         }
 477
 478         /**
 479          * Determine whether the object refers to a page within
 480          * this project.
 481          *
 482          * @return \type{\bool} TRUE if this is an in-project interwiki link
 483          *      or a wikilink, FALSE otherwise
 484          */
 485         public function isLocal() {
 486                 if ( $this->mInterwiki != '' ) {
 487                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 488                 } else {
 489                         return true;
 490                 }
 491         }
 492
 493         /**
 494          * Determine whether the object refers to a page within
 495          * this project and is transcludable.
 496          *
 497          * @return \type{\bool} TRUE if this is transcludable
 498          */
 499         public function isTrans() {
 500                 if ($this->mInterwiki == '')
 501                         return false;
 502
 503                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 504         }
 505
 506         /**
 507          * Escape a text fragment, say from a link, for a URL
 508          */
 509         static function escapeFragmentForURL( $fragment ) {
 510                 global $wgEnforceHtmlIds;
 511                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 512                 # fragments appear not to work in IE (at least up to 7) or in at least
 513                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 514                 # to care if they aren't encoded.
 515                 return Sanitizer::escapeId( $fragment,
 516                         $wgEnforceHtmlIds ? 'noninitial' : 'xml' );
 517         }
 518
 519 #----------------------------------------------------------------------------
 520 #       Other stuff
 521 #----------------------------------------------------------------------------
 522
 523         /** Simple accessors */
 524         /**
 525          * Get the text form (spaces not underscores) of the main part
 526          * @return \type{\string} Main part of the title
 527          */
 528         public function getText() { return $this->mTextform; }
 529         /**
 530          * Get the URL-encoded form of the main part
 531          * @return \type{\string} Main part of the title, URL-encoded
 532          */
 533         public function getPartialURL() { return $this->mUrlform; }
 534         /**
 535          * Get the main part with underscores
 536          * @return \type{\string} Main part of the title, with underscores
 537          */
 538         public function getDBkey() { return $this->mDbkeyform; }
 539         /**
 540          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 541          * @return \type{\int} Namespace index
 542          */
 543         public function getNamespace() { return $this->mNamespace; }
 544         /**
 545          * Get the namespace text
 546          * @return \type{\string} Namespace text
 547          */
 548         public function getNsText() {
 549                 global $wgContLang, $wgCanonicalNamespaceNames;
 550
 551                 if ( '' != $this->mInterwiki ) {
 552                         // This probably shouldn't even happen. ohh man, oh yuck.
 553                         // But for interwiki transclusion it sometimes does.
 554                         // Shit. Shit shit shit.
 555                         //
 556                         // Use the canonical namespaces if possible to try to
 557                         // resolve a foreign namespace.
 558                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 559                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 560                         }
 561                 }
 562                 return $wgContLang->getNsText( $this->mNamespace );
 563         }
 564         /**
 565          * Get the DB key with the initial letter case as specified by the user
 566          * @return \type{\string} DB key
 567          */
 568         function getUserCaseDBKey() {
 569                 return $this->mUserCaseDBKey;
 570         }
 571         /**
 572          * Get the namespace text of the subject (rather than talk) page
 573          * @return \type{\string} Namespace text
 574          */
 575         public function getSubjectNsText() {
 576                 global $wgContLang;
 577                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 578         }
 579         /**
 580          * Get the namespace text of the talk page
 581          * @return \type{\string} Namespace text
 582          */
 583         public function getTalkNsText() {
 584                 global $wgContLang;
 585                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 586         }
 587         /**
 588          * Could this title have a corresponding talk page?
 589          * @return \type{\bool} TRUE or FALSE
 590          */
 591         public function canTalk() {
 592                 return( MWNamespace::canTalk( $this->mNamespace ) );
 593         }
 594         /**
 595          * Get the interwiki prefix (or null string)
 596          * @return \type{\string} Interwiki prefix
 597          */
 598         public function getInterwiki() { return $this->mInterwiki; }
 599         /**
 600          * Get the Title fragment (i.e.\ the bit after the #) in text form
 601          * @return \type{\string} Title fragment
 602          */
 603         public function getFragment() { return $this->mFragment; }
 604         /**
 605          * Get the fragment in URL form, including the "#" character if there is one
 606          * @return \type{\string} Fragment in URL form
 607          */
 608         public function getFragmentForURL() {
 609                 if ( $this->mFragment == '' ) {
 610                         return '';
 611                 } else {
 612                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 613                 }
 614         }
 615         /**
 616          * Get the default namespace index, for when there is no namespace
 617          * @return \type{\int} Default namespace index
 618          */
 619         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 620
 621         /**
 622          * Get title for search index
 623          * @return \type{\string} a stripped-down title string ready for the
 624          *      search index
 625          */
 626         public function getIndexTitle() {
 627                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 628         }
 629
 630         /**
 631          * Get the prefixed database key form
 632          * @return \type{\string} the prefixed title, with underscores and
 633          *      any interwiki and namespace prefixes
 634          */
 635         public function getPrefixedDBkey() {
 636                 $s = $this->prefix( $this->mDbkeyform );
 637                 $s = str_replace( ' ', '_', $s );
 638                 return $s;
 639         }
 640
 641         /**
 642          * Get the prefixed title with spaces.
 643          * This is the form usually used for display
 644          * @return \type{\string} the prefixed title, with spaces
 645          */
 646         public function getPrefixedText() {
 647                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 648                         $s = $this->prefix( $this->mTextform );
 649                         $s = str_replace( '_', ' ', $s );
 650                         $this->mPrefixedText = $s;
 651                 }
 652                 return $this->mPrefixedText;
 653         }
 654
 655         /**
 656          * Get the prefixed title with spaces, plus any fragment
 657          * (part beginning with '#')
 658          * @return \type{\string} the prefixed title, with spaces and
 659          *      the fragment, including '#'
 660          */
 661         public function getFullText() {
 662                 $text = $this->getPrefixedText();
 663                 if( '' != $this->mFragment ) {
 664                         $text .= '#' . $this->mFragment;
 665                 }
 666                 return $text;
 667         }
 668
 669         /**
 670          * Get the base name, i.e. the leftmost parts before the /
 671          * @return \type{\string} Base name
 672          */
 673         public function getBaseText() {
 674                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 675                         return $this->getText();
 676                 }
 677
 678                 $parts = explode( '/', $this->getText() );
 679                 # Don't discard the real title if there's no subpage involved
 680                 if( count( $parts ) > 1 )
 681                         unset( $parts[ count( $parts ) - 1 ] );
 682                 return implode( '/', $parts );
 683         }
 684
 685         /**
 686          * Get the lowest-level subpage name, i.e. the rightmost part after /
 687          * @return \type{\string} Subpage name
 688          */
 689         public function getSubpageText() {
 690                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 691                         return( $this->mTextform );
 692                 }
 693                 $parts = explode( '/', $this->mTextform );
 694                 return( $parts[ count( $parts ) - 1 ] );
 695         }
 696
 697         /**
 698          * Get a URL-encoded form of the subpage text
 699          * @return \type{\string} URL-encoded subpage name
 700          */
 701         public function getSubpageUrlForm() {
 702                 $text = $this->getSubpageText();
 703                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 704                 return( $text );
 705         }
 706
 707         /**
 708          * Get a URL-encoded title (not an actual URL) including interwiki
 709          * @return \type{\string} the URL-encoded form
 710          */
 711         public function getPrefixedURL() {
 712                 $s = $this->prefix( $this->mDbkeyform );
 713                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 714                 return $s;
 715         }
 716
 717         /**
 718          * Get a real URL referring to this title, with interwiki link and
 719          * fragment
 720          *
 721          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 722          *   links. Can be specified as an associative array as well, e.g.,
 723          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 724          * @param $variant \type{\string} language variant of url (for sr, zh..)
 725          * @return \type{\string} the URL
 726          */
 727         public function getFullURL( $query = '', $variant = false ) {
 728                 global $wgContLang, $wgServer, $wgRequest;
 729
 730                 if( is_array( $query ) ) {
 731                         $query = wfArrayToCGI( $query );
 732                 }
 733
 734                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 735                 if ( !$interwiki ) {
 736                         $url = $this->getLocalUrl( $query, $variant );
 737
 738                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 739                         // Correct fix would be to move the prepending elsewhere.
 740                         if ($wgRequest->getVal('action') != 'render') {
 741                                 $url = $wgServer . $url;
 742                         }
 743                 } else {
 744                         $baseUrl = $interwiki->getURL( );
 745
 746                         $namespace = wfUrlencode( $this->getNsText() );
 747                         if ( '' != $namespace ) {
 748                                 # Can this actually happen? Interwikis shouldn't be parsed.
 749                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 750                                 $namespace .= ':';
 751                         }
 752                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 753                         $url = wfAppendQuery( $url, $query );
 754                 }
 755
 756                 # Finally, add the fragment.
 757                 $url .= $this->getFragmentForURL();
 758
 759                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 760                 return $url;
 761         }
 762
 763         /**
 764          * Get a URL with no fragment or server name.  If this page is generated
 765          * with action=render, $wgServer is prepended.
 766          * @param mixed $query an optional query string; if not specified,
 767          *       $wgArticlePath will be used.  Can be specified as an associative array
 768          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 769          *   URL-escaped).
 770          * @param $variant \type{\string} language variant of url (for sr, zh..)
 771          * @return \type{\string} the URL
 772          */
 773         public function getLocalURL( $query = '', $variant = false ) {
 774                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 775                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 776
 777                 if( is_array( $query ) ) {
 778                         $query = wfArrayToCGI( $query );
 779                 }
 780
 781                 // internal links should point to same variant as current page (only anonymous users)
 782                 if($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                                 } else {
 809                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 810                                 }
 811                         } else {
 812                                 global $wgActionPaths;
 813                                 $url = false;
 814                                 $matches = array();
 815                                 if( !empty( $wgActionPaths ) &&
 816                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 817                                 {
 818                                         $action = urldecode( $matches[2] );
 819                                         if( isset( $wgActionPaths[$action] ) ) {
 820                                                 $query = $matches[1];
 821                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 822                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 823                                                 if( $query != '' ) {
 824                                                         $url = wfAppendQuery( $url, $query );
 825                                                 }
 826                                         }
 827                                 }
 828                                 if ( $url === false ) {
 829                                         if ( $query == '-' ) {
 830                                                 $query = '';
 831                                         }
 832                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 833                                 }
 834                         }
 835
 836                         // FIXME: this causes breakage in various places when we
 837                         // actually expected a local URL and end up with dupe prefixes.
 838                         if ($wgRequest->getVal('action') == 'render') {
 839                                 $url = $wgServer . $url;
 840                         }
 841                 }
 842                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 843                 return $url;
 844         }
 845
 846         /**
 847          * Get a URL that's the simplest URL that will be valid to link, locally,
 848          * to the current Title.  It includes the fragment, but does not include
 849          * the server unless action=render is used (or the link is external).  If
 850          * there's a fragment but the prefixed text is empty, we just return a link
 851          * to the fragment.
 852          *
 853          * The result obviously should not be URL-escaped, but does need to be
 854          * HTML-escaped if it's being output in HTML.
 855          *
 856          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 857          *   query string.  Keys and values will be escaped.
 858          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 859          *   for external links.  Default is "false" (same variant as current page,
 860          *   for anonymous users).
 861          * @return \type{\string} the URL
 862          */
 863         public function getLinkUrl( $query = array(), $variant = false ) {
 864                 wfProfileIn( __METHOD__ );
 865                 if( !is_array( $query ) ) {
 866                         wfProfileOut( __METHOD__ );
 867                         throw new MWException( 'Title::getLinkUrl passed a non-array for '.
 868                         '$query' );
 869                 }
 870                 if( $this->isExternal() ) {
 871                         $ret = $this->getFullURL( $query );
 872                 } elseif( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
 873                         $ret = $this->getFragmentForURL();
 874                 } else {
 875                         $ret = $this->getLocalURL( $query, $variant ) . $this->getFragmentForURL();
 876                 }
 877                 wfProfileOut( __METHOD__ );
 878                 return $ret;
 879         }
 880
 881         /**
 882          * Get an HTML-escaped version of the URL form, suitable for
 883          * using in a link, without a server name or fragment
 884          * @param $query \type{\string} an optional query string
 885          * @return \type{\string} the URL
 886          */
 887         public function escapeLocalURL( $query = '' ) {
 888                 return htmlspecialchars( $this->getLocalURL( $query ) );
 889         }
 890
 891         /**
 892          * Get an HTML-escaped version of the URL form, suitable for
 893          * using in a link, including the server name and fragment
 894          *
 895          * @param $query \type{\string} an optional query string
 896          * @return \type{\string} the URL
 897          */
 898         public function escapeFullURL( $query = '' ) {
 899                 return htmlspecialchars( $this->getFullURL( $query ) );
 900         }
 901
 902         /**
 903          * Get the URL form for an internal link.
 904          * - Used in various Squid-related code, in case we have a different
 905          * internal hostname for the server from the exposed one.
 906          *
 907          * @param $query \type{\string} an optional query string
 908          * @param $variant \type{\string} language variant of url (for sr, zh..)
 909          * @return \type{\string} the URL
 910          */
 911         public function getInternalURL( $query = '', $variant = false ) {
 912                 global $wgInternalServer;
 913                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 914                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 915                 return $url;
 916         }
 917
 918         /**
 919          * Get the edit URL for this Title
 920          * @return \type{\string} the URL, or a null string if this is an
 921          *      interwiki link
 922          */
 923         public function getEditURL() {
 924                 if ( '' != $this->mInterwiki ) { return ''; }
 925                 $s = $this->getLocalURL( 'action=edit' );
 926
 927                 return $s;
 928         }
 929
 930         /**
 931          * Get the HTML-escaped displayable text form.
 932          * Used for the title field in <a> tags.
 933          * @return \type{\string} the text, including any prefixes
 934          */
 935         public function getEscapedText() {
 936                 return htmlspecialchars( $this->getPrefixedText() );
 937         }
 938
 939         /**
 940          * Is this Title interwiki?
 941          * @return \type{\bool}
 942          */
 943         public function isExternal() { return ( '' != $this->mInterwiki ); }
 944
 945         /**
 946          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 947          *
 948          * @param @action \type{\string} Action to check (default: edit)
 949          * @return \type{\bool}
 950          */
 951         public function isSemiProtected( $action = 'edit' ) {
 952                 if( $this->exists() ) {
 953                         $restrictions = $this->getRestrictions( $action );
 954                         if( count( $restrictions ) > 0 ) {
 955                                 foreach( $restrictions as $restriction ) {
 956                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 957                                                 return false;
 958                                 }
 959                         } else {
 960                                 # Not protected
 961                                 return false;
 962                         }
 963                         return true;
 964                 } else {
 965                         # If it doesn't exist, it can't be protected
 966                         return false;
 967                 }
 968         }
 969
 970         /**
 971          * Does the title correspond to a protected article?
 972          * @param $what \type{\string} the action the page is protected from,
 973          * by default checks move and edit
 974          * @return \type{\bool}
 975          */
 976         public function isProtected( $action = '' ) {
 977                 global $wgRestrictionLevels, $wgRestrictionTypes;
 978
 979                 # Special pages have inherent protection
 980                 if( $this->getNamespace() == NS_SPECIAL )
 981                         return true;
 982
 983                 # Check regular protection levels
 984                 foreach( $wgRestrictionTypes as $type ){
 985                         if( $action == $type || $action == '' ) {
 986                                 $r = $this->getRestrictions( $type );
 987                                 foreach( $wgRestrictionLevels as $level ) {
 988                                         if( in_array( $level, $r ) && $level != '' ) {
 989                                                 return true;
 990                                         }
 991                                 }
 992                         }
 993                 }
 994
 995                 return false;
 996         }
 997
 998         /**
 999          * Is $wgUser watching this page?
1000          * @return \type{\bool}
1001          */
1002         public function userIsWatching() {
1003                 global $wgUser;
1004
1005                 if ( is_null( $this->mWatched ) ) {
1006                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1007                                 $this->mWatched = false;
1008                         } else {
1009                                 $this->mWatched = $wgUser->isWatched( $this );
1010                         }
1011                 }
1012                 return $this->mWatched;
1013         }
1014
1015         /**
1016          * Can $wgUser perform $action on this page?
1017          * This skips potentially expensive cascading permission checks.
1018          *
1019          * Suitable for use for nonessential UI controls in common cases, but
1020          * _not_ for functional access control.
1021          *
1022          * May provide false positives, but should never provide a false negative.
1023          *
1024          * @param $action \type{\string} action that permission needs to be checked for
1025          * @return \type{\bool}
1026          */
1027         public function quickUserCan( $action ) {
1028                 return $this->userCan( $action, false );
1029         }
1030
1031         /**
1032          * Determines if $wgUser is unable to edit this page because it has been protected
1033          * by $wgNamespaceProtection.
1034          *
1035          * @return \type{\bool}
1036          */
1037         public function isNamespaceProtected() {
1038                 global $wgNamespaceProtection, $wgUser;
1039                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1040                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1041                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1042                                         return true;
1043                         }
1044                 }
1045                 return false;
1046         }
1047
1048         /**
1049          * Can $wgUser perform $action on this page?
1050          * @param $action \type{\string} action that permission needs to be checked for
1051          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1052          * @return \type{\bool}
1053          */
1054         public function userCan( $action, $doExpensiveQueries = true ) {
1055                 global $wgUser;
1056                 return ($this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries, true ) === array());
1057         }
1058
1059         /**
1060          * Can $user perform $action on this page?
1061          *
1062          * FIXME: This *does not* check throttles (User::pingLimiter()).
1063          *
1064          * @param $action \type{\string}action that permission needs to be checked for
1065          * @param $user \type{User} user to check
1066          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1067          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1068          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1069          */
1070         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1071                 if( !StubObject::isRealObject( $user ) ) {
1072                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1073                         global $wgUser;
1074                         $wgUser->_unstub( '', 5 );
1075                         $user = $wgUser;
1076                 }
1077                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1078
1079                 global $wgContLang;
1080                 global $wgLang;
1081                 global $wgEmailConfirmToEdit;
1082
1083                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1084                         $errors[] = array( 'confirmedittext' );
1085                 }
1086
1087                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1088                 if ( $action != 'read' && $action != 'createaccount' && $user->isBlockedFrom( $this ) ) {
1089                         $block = $user->mBlock;
1090
1091                         // This is from OutputPage::blockedPage
1092                         // Copied at r23888 by werdna
1093
1094                         $id = $user->blockedBy();
1095                         $reason = $user->blockedFor();
1096                         if( $reason == '' ) {
1097                                 $reason = wfMsg( 'blockednoreason' );
1098                         }
1099                         $ip = wfGetIP();
1100
1101                         if ( is_numeric( $id ) ) {
1102                                 $name = User::whoIs( $id );
1103                         } else {
1104                                 $name = $id;
1105                         }
1106
1107                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1108                         $blockid = $block->mId;
1109                         $blockExpiry = $user->mBlock->mExpiry;
1110                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1111
1112                         if ( $blockExpiry == 'infinity' ) {
1113                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1114                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1115
1116                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1117                                         if ( strpos( $option, ':' ) == false )
1118                                                 continue;
1119
1120                                         list ($show, $value) = explode( ":", $option );
1121
1122                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1123                                                 $blockExpiry = $show;
1124                                                 break;
1125                                         }
1126                                 }
1127                         } else {
1128                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1129                         }
1130
1131                         $intended = $user->mBlock->mAddress;
1132
1133                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1134                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1135                 }
1136
1137                 // Remove the errors being ignored.
1138
1139                 foreach( $errors as $index => $error ) {
1140                         $error_key = is_array($error) ? $error[0] : $error;
1141
1142                         if (in_array( $error_key, $ignoreErrors )) {
1143                                 unset($errors[$index]);
1144                         }
1145                 }
1146
1147                 return $errors;
1148         }
1149
1150         /**
1151          * Can $user perform $action on this page? This is an internal function,
1152          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1153          * checks on wfReadOnly() and blocks)
1154          *
1155          * @param $action \type{\string} action that permission needs to be checked for
1156          * @param $user \type{User} user to check
1157          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1158          * @param $short \type{\bool} Set this to true to stop after the first permission error.
1159          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1160          */
1161         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries=true, $short=false ) {
1162                 wfProfileIn( __METHOD__ );
1163
1164                 $errors = array();
1165
1166                 // First stop is permissions checks, which fail most often, and which are easiest to test.
1167                 if ( $action == 'move' ) {
1168                         if( !$user->isAllowed( 'move-rootuserpages' )
1169                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1170                         {
1171                                 // Show user page-specific message only if the user can move other pages
1172                                 $errors[] = array( 'cant-move-user-page' );
1173                         }
1174
1175                         // Check if user is allowed to move files if it's a file
1176                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1177                                 $errors[] = array( 'movenotallowedfile' );
1178                         }
1179
1180                         if( !$user->isAllowed( 'move' ) ) {
1181                                 // User can't move anything
1182                                 global $wgGroupPermissions;
1183                                 if( $user->isAnon() && ( $wgGroupPermissions['user']['move']
1184                                 || $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1185                                         // custom message if logged-in users without any special rights can move
1186                                         $errors[] = array ( 'movenologintext' );
1187                                 } else {
1188                                         $errors[] = array ('movenotallowed');
1189                                 }
1190                         }
1191                 } elseif ( $action == 'create' ) {
1192                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1193                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1194                         {
1195                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1196                         }
1197                 } elseif( $action == 'move-target' ) {
1198                         if( !$user->isAllowed( 'move' ) ) {
1199                                 // User can't move anything
1200                                 $errors[] = array ('movenotallowed');
1201                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1202                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1203                         {
1204                                 // Show user page-specific message only if the user can move other pages
1205                                 $errors[] = array( 'cant-move-to-user-page' );
1206                         }
1207                 } elseif( !$user->isAllowed( $action ) ) {
1208                         $return = null;
1209                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1210                                 User::getGroupsWithPermission( $action ) );
1211                         if( $groups ) {
1212                                 $return = array( 'badaccess-groups',
1213                                         array( implode( ', ', $groups ), count( $groups ) ) );
1214                         } else {
1215                                 $return = array( "badaccess-group0" );
1216                         }
1217                         $errors[] = $return;
1218                 }
1219
1220                 # Short-circuit point
1221                 if( $short && count($errors) > 0 ) {
1222                         wfProfileOut( __METHOD__ );
1223                         return $errors;
1224                 }
1225
1226                 // Use getUserPermissionsErrors instead
1227                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1228                         wfProfileOut( __METHOD__ );
1229                         return $result ? array() : array( array( 'badaccess-group0' ) );
1230                 }
1231                 // Check getUserPermissionsErrors hook
1232                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1233                         if( is_array($result) && count($result) && !is_array($result[0]) )
1234                                 $errors[] = $result; # A single array representing an error
1235                         else if( is_array($result) && is_array($result[0]) )
1236                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1237                         else if( $result !== '' && is_string($result) )
1238                                 $errors[] = array($result); # A string representing a message-id
1239                         else if( $result === false )
1240                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1241                 }
1242                 # Short-circuit point
1243                 if( $short && count($errors) > 0 ) {
1244                         wfProfileOut( __METHOD__ );
1245                         return $errors;
1246                 }
1247                 // Check getUserPermissionsErrorsExpensive hook
1248                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1249                         if( is_array($result) && count($result) && !is_array($result[0]) )
1250                                 $errors[] = $result; # A single array representing an error
1251                         else if( is_array($result) && is_array($result[0]) )
1252                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1253                         else if( $result !== '' && is_string($result) )
1254                                 $errors[] = array($result); # A string representing a message-id
1255                         else if( $result === false )
1256                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1257                 }
1258                 # Short-circuit point
1259                 if( $short && count($errors) > 0 ) {
1260                         wfProfileOut( __METHOD__ );
1261                         return $errors;
1262                 }
1263
1264                 # Only 'createaccount' and 'execute' can be performed on
1265                 # special pages, which don't actually exist in the DB.
1266                 $specialOKActions = array( 'createaccount', 'execute' );
1267                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1268                         $errors[] = array('ns-specialprotected');
1269                 }
1270
1271                 # Check $wgNamespaceProtection for restricted namespaces
1272                 if( $this->isNamespaceProtected() ) {
1273                         $ns = $this->getNamespace() == NS_MAIN ?
1274                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1275                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1276                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1277                 }
1278
1279                 # Protect css/js subpages of user pages
1280                 # XXX: this might be better using restrictions
1281                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1282                 if( $this->isCssJsSubpage() && !$user->isAllowed('editusercssjs')
1283                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1284                 {
1285                         $errors[] = array('customcssjsprotected');
1286                 }
1287
1288                 # Check against page_restrictions table requirements on this
1289                 # page. The user must possess all required rights for this action.
1290                 foreach( $this->getRestrictions($action) as $right ) {
1291                         // Backwards compatibility, rewrite sysop -> protect
1292                         if( $right == 'sysop' ) {
1293                                 $right = 'protect';
1294                         }
1295                         if( '' != $right && !$user->isAllowed( $right ) ) {
1296                                 // Users with 'editprotected' permission can edit protected pages
1297                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1298                                         // Users with 'editprotected' permission cannot edit protected pages
1299                                         // with cascading option turned on.
1300                                         if( $this->mCascadeRestriction ) {
1301                                                 $errors[] = array( 'protectedpagetext', $right );
1302                                         }
1303                                 } else {
1304                                         $errors[] = array( 'protectedpagetext', $right );
1305                                 }
1306                         }
1307                 }
1308                 # Short-circuit point
1309                 if( $short && count($errors) > 0 ) {
1310                         wfProfileOut( __METHOD__ );
1311                         return $errors;
1312                 }
1313
1314                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1315                         # We /could/ use the protection level on the source page, but it's fairly ugly
1316                         #  as we have to establish a precedence hierarchy for pages included by multiple
1317                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1318                         #  as they could remove the protection anyway.
1319                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1320                         # Cascading protection depends on more than this page...
1321                         # Several cascading protected pages may include this page...
1322                         # Check each cascading level
1323                         # This is only for protection restrictions, not for all actions
1324                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1325                                 foreach( $restrictions[$action] as $right ) {
1326                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1327                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1328                                                 $pages = '';
1329                                                 foreach( $cascadingSources as $page )
1330                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1331                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1332                                         }
1333                                 }
1334                         }
1335                 }
1336                 # Short-circuit point
1337                 if( $short && count($errors) > 0 ) {
1338                         wfProfileOut( __METHOD__ );
1339                         return $errors;
1340                 }
1341
1342                 if( $action == 'protect' ) {
1343                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1344                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1345                         }
1346                 }
1347
1348                 if( $action == 'create' ) {
1349                         $title_protection = $this->getTitleProtection();
1350                         if( is_array($title_protection) ) {
1351                                 extract($title_protection); // is this extract() really needed?
1352
1353                                 if( $pt_create_perm == 'sysop' ) {
1354                                         $pt_create_perm = 'protect'; // B/C
1355                                 }
1356                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1357                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1358                                 }
1359                         }
1360                 } elseif( $action == 'move' ) {
1361                         // Check for immobile pages
1362                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1363                                 // Specific message for this case
1364                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1365                         } elseif( !$this->isMovable() ) {
1366                                 // Less specific message for rarer cases
1367                                 $errors[] = array( 'immobile-page' );
1368                         }
1369                 } elseif( $action == 'move-target' ) {
1370                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1371                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1372                         } elseif( !$this->isMovable() ) {
1373                                 $errors[] = array( 'immobile-target-page' );
1374                         }
1375                 }
1376
1377                 wfProfileOut( __METHOD__ );
1378                 return $errors;
1379         }
1380
1381         /**
1382          * Is this title subject to title protection?
1383          * @return \type{\mixed} An associative array representing any existent title
1384          *   protection, or false if there's none.
1385          */
1386         private function getTitleProtection() {
1387                 // Can't protect pages in special namespaces
1388                 if ( $this->getNamespace() < 0 ) {
1389                         return false;
1390                 }
1391
1392                 $dbr = wfGetDB( DB_SLAVE );
1393                 $res = $dbr->select( 'protected_titles', '*',
1394                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1395                         __METHOD__ );
1396
1397                 if ($row = $dbr->fetchRow( $res )) {
1398                         return $row;
1399                 } else {
1400                         return false;
1401                 }
1402         }
1403
1404         /**
1405          * Update the title protection status
1406          * @param $create_perm \type{\string} Permission required for creation
1407          * @param $reason \type{\string} Reason for protection
1408          * @param $expiry \type{\string} Expiry timestamp
1409          */
1410         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1411                 global $wgUser,$wgContLang;
1412
1413                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1414                         && $expiry == $this->mRestrictionsExpiry['create']) {
1415                         // No change
1416                         return true;
1417                 }
1418
1419                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1420
1421                 $dbw = wfGetDB( DB_MASTER );
1422
1423                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1424
1425                 $expiry_description = '';
1426                 if ( $encodedExpiry != 'infinity' ) {
1427                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) , $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1428                 }
1429                 else {
1430                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1431                 }
1432
1433                 # Update protection table
1434                 if ($create_perm != '' ) {
1435                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1436                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1437                                         , 'pt_create_perm' => $create_perm
1438                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1439                                         , 'pt_expiry' => $encodedExpiry
1440                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1441                 } else {
1442                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1443                                 'pt_title' => $title ), __METHOD__ );
1444                 }
1445                 # Update the protection log
1446                 $log = new LogPage( 'protect' );
1447
1448                 if( $create_perm ) {
1449                         $params = array("[create=$create_perm] $expiry_description",'');
1450                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason ), $params );
1451                 } else {
1452                         $log->addEntry( 'unprotect', $this, $reason );
1453                 }
1454
1455                 return true;
1456         }
1457
1458         /**
1459          * Remove any title protection due to page existing
1460          */
1461         public function deleteTitleProtection() {
1462                 $dbw = wfGetDB( DB_MASTER );
1463
1464                 $dbw->delete( 'protected_titles',
1465                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1466                         __METHOD__ );
1467         }
1468
1469         /**
1470          * Would anybody with sufficient privileges be able to move this page?
1471          * Some pages just aren't movable.
1472          *
1473          * @return \type{\bool} TRUE or FALSE
1474          */
1475         public function isMovable() {
1476                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1477         }
1478
1479         /**
1480          * Can $wgUser read this page?
1481          * @return \type{\bool} TRUE or FALSE
1482          * @todo fold these checks into userCan()
1483          */
1484         public function userCanRead() {
1485                 global $wgUser, $wgGroupPermissions;
1486
1487                 $result = null;
1488                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1489                 if ( $result !== null ) {
1490                         return $result;
1491                 }
1492
1493                 # Shortcut for public wikis, allows skipping quite a bit of code
1494                 if ( !empty( $wgGroupPermissions['*']['read'] ) )
1495                         return true;
1496
1497                 if( $wgUser->isAllowed( 'read' ) ) {
1498                         return true;
1499                 } else {
1500                         global $wgWhitelistRead;
1501
1502                         /**
1503                          * Always grant access to the login page.
1504                          * Even anons need to be able to log in.
1505                         */
1506                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1507                                 return true;
1508                         }
1509
1510                         /**
1511                          * Bail out if there isn't whitelist
1512                          */
1513                         if( !is_array($wgWhitelistRead) ) {
1514                                 return false;
1515                         }
1516
1517                         /**
1518                          * Check for explicit whitelisting
1519                          */
1520                         $name = $this->getPrefixedText();
1521                         $dbName = $this->getPrefixedDBKey();
1522                         // Check with and without underscores
1523                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1524                                 return true;
1525
1526                         /**
1527                          * Old settings might have the title prefixed with
1528                          * a colon for main-namespace pages
1529                          */
1530                         if( $this->getNamespace() == NS_MAIN ) {
1531                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1532                                         return true;
1533                         }
1534
1535                         /**
1536                          * If it's a special page, ditch the subpage bit
1537                          * and check again
1538                          */
1539                         if( $this->getNamespace() == NS_SPECIAL ) {
1540                                 $name = $this->getDBkey();
1541                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1542                                 if ( $name === false ) {
1543                                         # Invalid special page, but we show standard login required message
1544                                         return false;
1545                                 }
1546
1547                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1548                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1549                                         return true;
1550                         }
1551
1552                 }
1553                 return false;
1554         }
1555
1556         /**
1557          * Is this a talk page of some sort?
1558          * @return \type{\bool} TRUE or FALSE
1559          */
1560         public function isTalkPage() {
1561                 return MWNamespace::isTalk( $this->getNamespace() );
1562         }
1563
1564         /**
1565          * Is this a subpage?
1566          * @return \type{\bool} TRUE or FALSE
1567          */
1568         public function isSubpage() {
1569                 return MWNamespace::hasSubpages( $this->mNamespace )
1570                         ? strpos( $this->getText(), '/' ) !== false
1571                         : false;
1572         }
1573
1574         /**
1575          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1576          * @return \type{\bool} TRUE or FALSE
1577          */
1578         public function hasSubpages() {
1579                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1580                         # Duh
1581                         return false;
1582                 }
1583
1584                 # We dynamically add a member variable for the purpose of this method
1585                 # alone to cache the result.  There's no point in having it hanging
1586                 # around uninitialized in every Title object; therefore we only add it
1587                 # if needed and don't declare it statically.
1588                 if( isset( $this->mHasSubpages ) ) {
1589                         return $this->mHasSubpages;
1590                 }
1591
1592                 $subpages = $this->getSubpages( 1 );
1593                 if( $subpages instanceof TitleArray )
1594                         return $this->mHasSubpages = (bool)$subpages->count();
1595                 return $this->mHasSubpages = false;
1596         }
1597
1598         /**
1599          * Get all subpages of this page.
1600          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1601          * @return mixed TitleArray, or empty array if this page's namespace
1602          *  doesn't allow subpages
1603          */
1604         public function getSubpages( $limit = -1 ) {
1605                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1606                         return array();
1607
1608                 $dbr = wfGetDB( DB_SLAVE );
1609                 $conds['page_namespace'] = $this->getNamespace();
1610                 $conds[] = 'page_title LIKE ' . $dbr->addQuotes(
1611                                 $dbr->escapeLike( $this->getDBkey() ) . '/%' );
1612                 $options = array();
1613                 if( $limit > -1 )
1614                         $options['LIMIT'] = $limit;
1615                 return $this->mSubpages = TitleArray::newFromResult(
1616                         $dbr->select( 'page',
1617                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1618                                 $conds,
1619                                 __METHOD__,
1620                                 $options
1621                         )
1622                 );
1623         }
1624
1625         /**
1626          * Could this page contain custom CSS or JavaScript, based
1627          * on the title?
1628          *
1629          * @return \type{\bool} TRUE or FALSE
1630          */
1631         public function isCssOrJsPage() {
1632                 return $this->mNamespace == NS_MEDIAWIKI
1633                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1634         }
1635
1636         /**
1637          * Is this a .css or .js subpage of a user page?
1638          * @return \type{\bool} TRUE or FALSE
1639          */
1640         public function isCssJsSubpage() {
1641                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1642         }
1643         /**
1644          * Is this a *valid* .css or .js subpage of a user page?
1645          * Check that the corresponding skin exists
1646          * @return \type{\bool} TRUE or FALSE
1647          */
1648         public function isValidCssJsSubpage() {
1649                 if ( $this->isCssJsSubpage() ) {
1650                         $skinNames = Skin::getSkinNames();
1651                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1652                 } else {
1653                         return false;
1654                 }
1655         }
1656         /**
1657          * Trim down a .css or .js subpage title to get the corresponding skin name
1658          */
1659         public function getSkinFromCssJsSubpage() {
1660                 $subpage = explode( '/', $this->mTextform );
1661                 $subpage = $subpage[ count( $subpage ) - 1 ];
1662                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1663         }
1664         /**
1665          * Is this a .css subpage of a user page?
1666          * @return \type{\bool} TRUE or FALSE
1667          */
1668         public function isCssSubpage() {
1669                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1670         }
1671         /**
1672          * Is this a .js subpage of a user page?
1673          * @return \type{\bool} TRUE or FALSE
1674          */
1675         public function isJsSubpage() {
1676                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1677         }
1678         /**
1679          * Protect css/js subpages of user pages: can $wgUser edit
1680          * this page?
1681          *
1682          * @return \type{\bool} TRUE or FALSE
1683          * @todo XXX: this might be better using restrictions
1684          */
1685         public function userCanEditCssJsSubpage() {
1686                 global $wgUser;
1687                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1688         }
1689
1690         /**
1691          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1692          *
1693          * @return \type{\bool} If the page is subject to cascading restrictions.
1694          */
1695         public function isCascadeProtected() {
1696                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1697                 return ( $sources > 0 );
1698         }
1699
1700         /**
1701          * Cascading protection: Get the source of any cascading restrictions on this page.
1702          *
1703          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1704          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1705          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1706          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1707          */
1708         public function getCascadeProtectionSources( $get_pages = true ) {
1709                 global $wgRestrictionTypes;
1710
1711                 # Define our dimension of restrictions types
1712                 $pagerestrictions = array();
1713                 foreach( $wgRestrictionTypes as $action )
1714                         $pagerestrictions[$action] = array();
1715
1716                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1717                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1718                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1719                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1720                 }
1721
1722                 wfProfileIn( __METHOD__ );
1723
1724                 $dbr = wfGetDB( DB_SLAVE );
1725
1726                 if ( $this->getNamespace() == NS_FILE ) {
1727                         $tables = array ('imagelinks', 'page_restrictions');
1728                         $where_clauses = array(
1729                                 'il_to' => $this->getDBkey(),
1730                                 'il_from=pr_page',
1731                                 'pr_cascade' => 1 );
1732                 } else {
1733                         $tables = array ('templatelinks', 'page_restrictions');
1734                         $where_clauses = array(
1735                                 'tl_namespace' => $this->getNamespace(),
1736                                 'tl_title' => $this->getDBkey(),
1737                                 'tl_from=pr_page',
1738                                 'pr_cascade' => 1 );
1739                 }
1740
1741                 if ( $get_pages ) {
1742                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1743                         $where_clauses[] = 'page_id=pr_page';
1744                         $tables[] = 'page';
1745                 } else {
1746                         $cols = array( 'pr_expiry' );
1747                 }
1748
1749                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1750
1751                 $sources = $get_pages ? array() : false;
1752                 $now = wfTimestampNow();
1753                 $purgeExpired = false;
1754
1755                 foreach( $res as $row ) {
1756                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1757                         if( $expiry > $now ) {
1758                                 if ($get_pages) {
1759                                         $page_id = $row->pr_page;
1760                                         $page_ns = $row->page_namespace;
1761                                         $page_title = $row->page_title;
1762                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1763                                         # Add groups needed for each restriction type if its not already there
1764                                         # Make sure this restriction type still exists
1765                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1766                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1767                                         }
1768                                 } else {
1769                                         $sources = true;
1770                                 }
1771                         } else {
1772                                 // Trigger lazy purge of expired restrictions from the db
1773                                 $purgeExpired = true;
1774                         }
1775                 }
1776                 if( $purgeExpired ) {
1777                         Title::purgeExpiredRestrictions();
1778                 }
1779
1780                 wfProfileOut( __METHOD__ );
1781
1782                 if ( $get_pages ) {
1783                         $this->mCascadeSources = $sources;
1784                         $this->mCascadingRestrictions = $pagerestrictions;
1785                 } else {
1786                         $this->mHasCascadingRestrictions = $sources;
1787                 }
1788                 return array( $sources, $pagerestrictions );
1789         }
1790
1791         function areRestrictionsCascading() {
1792                 if (!$this->mRestrictionsLoaded) {
1793                         $this->loadRestrictions();
1794                 }
1795
1796                 return $this->mCascadeRestriction;
1797         }
1798
1799         /**
1800          * Loads a string into mRestrictions array
1801          * @param $res \type{Resource} restrictions as an SQL result.
1802          */
1803         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1804                 global $wgRestrictionTypes;
1805                 $dbr = wfGetDB( DB_SLAVE );
1806
1807                 foreach( $wgRestrictionTypes as $type ){
1808                         $this->mRestrictions[$type] = array();
1809                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1810                 }
1811
1812                 $this->mCascadeRestriction = false;
1813
1814                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1815
1816                 if ( $oldFashionedRestrictions === NULL ) {
1817                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1818                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1819                 }
1820
1821                 if ($oldFashionedRestrictions != '') {
1822
1823                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1824                                 $temp = explode( '=', trim( $restrict ) );
1825                                 if(count($temp) == 1) {
1826                                         // old old format should be treated as edit/move restriction
1827                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1828                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1829                                 } else {
1830                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1831                                 }
1832                         }
1833
1834                         $this->mOldRestrictions = true;
1835
1836                 }
1837
1838                 if( $dbr->numRows( $res ) ) {
1839                         # Current system - load second to make them override.
1840                         $now = wfTimestampNow();
1841                         $purgeExpired = false;
1842
1843                         foreach( $res as $row ) {
1844                                 # Cycle through all the restrictions.
1845
1846                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1847                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1848                                         continue;
1849
1850                                 // This code should be refactored, now that it's being used more generally,
1851                                 // But I don't really see any harm in leaving it in Block for now -werdna
1852                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1853
1854                                 // Only apply the restrictions if they haven't expired!
1855                                 if ( !$expiry || $expiry > $now ) {
1856                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1857                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1858
1859                                         $this->mCascadeRestriction |= $row->pr_cascade;
1860                                 } else {
1861                                         // Trigger a lazy purge of expired restrictions
1862                                         $purgeExpired = true;
1863                                 }
1864                         }
1865
1866                         if( $purgeExpired ) {
1867                                 Title::purgeExpiredRestrictions();
1868                         }
1869                 }
1870
1871                 $this->mRestrictionsLoaded = true;
1872         }
1873
1874         /**
1875          * Load restrictions from the page_restrictions table
1876          */
1877         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1878                 if( !$this->mRestrictionsLoaded ) {
1879                         if ($this->exists()) {
1880                                 $dbr = wfGetDB( DB_SLAVE );
1881
1882                                 $res = $dbr->select( 'page_restrictions', '*',
1883                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1884
1885                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1886                         } else {
1887                                 $title_protection = $this->getTitleProtection();
1888
1889                                 if (is_array($title_protection)) {
1890                                         extract($title_protection);
1891
1892                                         $now = wfTimestampNow();
1893                                         $expiry = Block::decodeExpiry($pt_expiry);
1894
1895                                         if (!$expiry || $expiry > $now) {
1896                                                 // Apply the restrictions
1897                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1898                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1899                                         } else { // Get rid of the old restrictions
1900                                                 Title::purgeExpiredRestrictions();
1901                                         }
1902                                 } else {
1903                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1904                                 }
1905                                 $this->mRestrictionsLoaded = true;
1906                         }
1907                 }
1908         }
1909
1910         /**
1911          * Purge expired restrictions from the page_restrictions table
1912          */
1913         static function purgeExpiredRestrictions() {
1914                 $dbw = wfGetDB( DB_MASTER );
1915                 $dbw->delete( 'page_restrictions',
1916                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1917                         __METHOD__ );
1918
1919                 $dbw->delete( 'protected_titles',
1920                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1921                         __METHOD__ );
1922         }
1923
1924         /**
1925          * Accessor/initialisation for mRestrictions
1926          *
1927          * @param $action \type{\string} action that permission needs to be checked for
1928          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
1929          */
1930         public function getRestrictions( $action ) {
1931                 if( !$this->mRestrictionsLoaded ) {
1932                         $this->loadRestrictions();
1933                 }
1934                 return isset( $this->mRestrictions[$action] )
1935                                 ? $this->mRestrictions[$action]
1936                                 : array();
1937         }
1938
1939         /**
1940          * Get the expiry time for the restriction against a given action
1941          * @return 14-char timestamp, or 'infinity' if the page is protected forever
1942          * or not protected at all, or false if the action is not recognised.
1943          */
1944         public function getRestrictionExpiry( $action ) {
1945                 if( !$this->mRestrictionsLoaded ) {
1946                         $this->loadRestrictions();
1947                 }
1948                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
1949         }
1950
1951         /**
1952          * Is there a version of this page in the deletion archive?
1953          * @return \type{\int} the number of archived revisions
1954          */
1955         public function isDeleted() {
1956                 if( $this->getNamespace() < 0 ) {
1957                         $n = 0;
1958                 } else {
1959                         $dbr = wfGetDB( DB_SLAVE );
1960                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
1961                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
1962                                 __METHOD__
1963                         );
1964                         if( $this->getNamespace() == NS_FILE ) {
1965                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1966                                         array( 'fa_name' => $this->getDBkey() ),
1967                                         __METHOD__
1968                                 );
1969                         }
1970                 }
1971                 return (int)$n;
1972         }
1973
1974         /**
1975          * Is there a version of this page in the deletion archive?
1976          * @return bool
1977          */
1978         public function isDeletedQuick() {
1979                 if( $this->getNamespace() < 0 ) {
1980                         return false;
1981                 }
1982                 $dbr = wfGetDB( DB_SLAVE );
1983                 $deleted = (bool)$dbr->selectField( 'archive', '1',
1984                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
1985                         __METHOD__
1986                 );
1987                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
1988                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
1989                                 array( 'fa_name' => $this->getDBkey() ),
1990                                 __METHOD__
1991                         );
1992                 }
1993                 return $deleted;
1994         }
1995
1996         /**
1997          * Get the article ID for this Title from the link cache,
1998          * adding it if necessary
1999          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2000          *      for update
2001          * @return \type{\int} the ID
2002          */
2003         public function getArticleID( $flags = 0 ) {
2004                 if( $this->getNamespace() < 0 ) {
2005                         return $this->mArticleID = 0;
2006                 }
2007                 $linkCache = LinkCache::singleton();
2008                 if( $flags & GAID_FOR_UPDATE ) {
2009                         $oldUpdate = $linkCache->forUpdate( true );
2010                         $linkCache->clearLink( $this );
2011                         $this->mArticleID = $linkCache->addLinkObj( $this );
2012                         $linkCache->forUpdate( $oldUpdate );
2013                 } else {
2014                         if( -1 == $this->mArticleID ) {
2015                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2016                         }
2017                 }
2018                 return $this->mArticleID;
2019         }
2020
2021         /**
2022          * Is this an article that is a redirect page?
2023          * Uses link cache, adding it if necessary
2024          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2025          * @return \type{\bool}
2026          */
2027         public function isRedirect( $flags = 0 ) {
2028                 if( !is_null($this->mRedirect) )
2029                         return $this->mRedirect;
2030                 # Calling getArticleID() loads the field from cache as needed
2031                 if( !$this->getArticleID($flags) ) {
2032                         return $this->mRedirect = false;
2033                 }
2034                 $linkCache = LinkCache::singleton();
2035                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2036
2037                 return $this->mRedirect;
2038         }
2039
2040         /**
2041          * What is the length of this page?
2042          * Uses link cache, adding it if necessary
2043          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2044          * @return \type{\bool}
2045          */
2046         public function getLength( $flags = 0 ) {
2047                 if( $this->mLength != -1 )
2048                         return $this->mLength;
2049                 # Calling getArticleID() loads the field from cache as needed
2050                 if( !$this->getArticleID($flags) ) {
2051                         return $this->mLength = 0;
2052                 }
2053                 $linkCache = LinkCache::singleton();
2054                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2055
2056                 return $this->mLength;
2057         }
2058
2059         /**
2060          * What is the page_latest field for this page?
2061          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2062          * @return \type{\int}
2063          */
2064         public function getLatestRevID( $flags = 0 ) {
2065                 if( $this->mLatestID !== false )
2066                         return $this->mLatestID;
2067
2068                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2069                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
2070                 return $this->mLatestID;
2071         }
2072
2073         /**
2074          * This clears some fields in this object, and clears any associated
2075          * keys in the "bad links" section of the link cache.
2076          *
2077          * - This is called from Article::insertNewArticle() to allow
2078          * loading of the new page_id. It's also called from
2079          * Article::doDeleteArticle()
2080          *
2081          * @param $newid \type{\int} the new Article ID
2082          */
2083         public function resetArticleID( $newid ) {
2084                 $linkCache = LinkCache::singleton();
2085                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2086
2087                 if ( $newid === false ) { $this->mArticleID = -1; }
2088                 else { $this->mArticleID = $newid; }
2089                 $this->mRestrictionsLoaded = false;
2090                 $this->mRestrictions = array();
2091         }
2092
2093         /**
2094          * Updates page_touched for this page; called from LinksUpdate.php
2095          * @return \type{\bool} true if the update succeded
2096          */
2097         public function invalidateCache() {
2098                 if( wfReadOnly() ) {
2099                         return;
2100                 }
2101                 $dbw = wfGetDB( DB_MASTER );
2102                 $success = $dbw->update( 'page',
2103                         array( 'page_touched' => $dbw->timestamp() ),
2104                         $this->pageCond(),
2105                         __METHOD__
2106                 );
2107                 HTMLFileCache::clearFileCache( $this );
2108                 return $success;
2109         }
2110
2111         /**
2112          * Prefix some arbitrary text with the namespace or interwiki prefix
2113          * of this object
2114          *
2115          * @param $name \type{\string} the text
2116          * @return \type{\string} the prefixed text
2117          * @private
2118          */
2119         /* private */ function prefix( $name ) {
2120                 $p = '';
2121                 if ( '' != $this->mInterwiki ) {
2122                         $p = $this->mInterwiki . ':';
2123                 }
2124                 if ( 0 != $this->mNamespace ) {
2125                         $p .= $this->getNsText() . ':';
2126                 }
2127                 return $p . $name;
2128         }
2129
2130         /**
2131          * Secure and split - main initialisation function for this object
2132          *
2133          * Assumes that mDbkeyform has been set, and is urldecoded
2134          * and uses underscores, but not otherwise munged.  This function
2135          * removes illegal characters, splits off the interwiki and
2136          * namespace prefixes, sets the other forms, and canonicalizes
2137          * everything.
2138          * @return \type{\bool} true on success
2139          */
2140         private function secureAndSplit() {
2141                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2142
2143                 # Initialisation
2144                 static $rxTc = false;
2145                 if( !$rxTc ) {
2146                         # Matching titles will be held as illegal.
2147                         $rxTc = '/' .
2148                                 # Any character not allowed is forbidden...
2149                                 '[^' . Title::legalChars() . ']' .
2150                                 # URL percent encoding sequences interfere with the ability
2151                                 # to round-trip titles -- you can't link to them consistently.
2152                                 '|%[0-9A-Fa-f]{2}' .
2153                                 # XML/HTML character references produce similar issues.
2154                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2155                                 '|&#[0-9]+;' .
2156                                 '|&#x[0-9A-Fa-f]+;' .
2157                                 '/S';
2158                 }
2159
2160                 $this->mInterwiki = $this->mFragment = '';
2161                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2162
2163                 $dbkey = $this->mDbkeyform;
2164
2165                 # Strip Unicode bidi override characters.
2166                 # Sometimes they slip into cut-n-pasted page titles, where the
2167                 # override chars get included in list displays.
2168                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2169
2170                 # Clean up whitespace
2171                 #
2172                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2173                 $dbkey = trim( $dbkey, '_' );
2174
2175                 if ( '' == $dbkey ) {
2176                         return false;
2177                 }
2178
2179                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2180                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2181                         return false;
2182                 }
2183
2184                 $this->mDbkeyform = $dbkey;
2185
2186                 # Initial colon indicates main namespace rather than specified default
2187                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2188                 if ( ':' == $dbkey{0} ) {
2189                         $this->mNamespace = NS_MAIN;
2190                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2191                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2192                 }
2193
2194                 # Namespace or interwiki prefix
2195                 $firstPass = true;
2196                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2197                 do {
2198                         $m = array();
2199                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2200                                 $p = $m[1];
2201                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2202                                         # Ordinary namespace
2203                                         $dbkey = $m[2];
2204                                         $this->mNamespace = $ns;
2205                                         # For Talk:X pages, check if X has a "namespace" prefix
2206                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2207                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2208                                                         return false; # Disallow Talk:File:x type titles...
2209                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2210                                                         return false; # Disallow Talk:Interwiki:x type titles...
2211                                         }
2212                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2213                                         if( !$firstPass ) {
2214                                                 # Can't make a local interwiki link to an interwiki link.
2215                                                 # That's just crazy!
2216                                                 return false;
2217                                         }
2218
2219                                         # Interwiki link
2220                                         $dbkey = $m[2];
2221                                         $this->mInterwiki = $wgContLang->lc( $p );
2222
2223                                         # Redundant interwiki prefix to the local wiki
2224                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2225                                                 if( $dbkey == '' ) {
2226                                                         # Can't have an empty self-link
2227                                                         return false;
2228                                                 }
2229                                                 $this->mInterwiki = '';
2230                                                 $firstPass = false;
2231                                                 # Do another namespace split...
2232                                                 continue;
2233                                         }
2234
2235                                         # If there's an initial colon after the interwiki, that also
2236                                         # resets the default namespace
2237                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2238                                                 $this->mNamespace = NS_MAIN;
2239                                                 $dbkey = substr( $dbkey, 1 );
2240                                         }
2241                                 }
2242                                 # If there's no recognized interwiki or namespace,
2243                                 # then let the colon expression be part of the title.
2244                         }
2245                         break;
2246                 } while( true );
2247
2248                 # We already know that some pages won't be in the database!
2249                 #
2250                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2251                         $this->mArticleID = 0;
2252                 }
2253                 $fragment = strstr( $dbkey, '#' );
2254                 if ( false !== $fragment ) {
2255                         $this->setFragment( $fragment );
2256                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2257                         # remove whitespace again: prevents "Foo_bar_#"
2258                         # becoming "Foo_bar_"
2259                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2260                 }
2261
2262                 # Reject illegal characters.
2263                 #
2264                 if( preg_match( $rxTc, $dbkey ) ) {
2265                         return false;
2266                 }
2267
2268                 /**
2269                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2270                  * reachable due to the way web browsers deal with 'relative' URLs.
2271                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2272                  */
2273                 if ( strpos( $dbkey, '.' ) !== false &&
2274                      ( $dbkey === '.' || $dbkey === '..' ||
2275                        strpos( $dbkey, './' ) === 0  ||
2276                        strpos( $dbkey, '../' ) === 0 ||
2277                        strpos( $dbkey, '/./' ) !== false ||
2278                        strpos( $dbkey, '/../' ) !== false  ||
2279                        substr( $dbkey, -2 ) == '/.' ||
2280                        substr( $dbkey, -3 ) == '/..' ) )
2281                 {
2282                         return false;
2283                 }
2284
2285                 /**
2286                  * Magic tilde sequences? Nu-uh!
2287                  */
2288                 if( strpos( $dbkey, '~~~' ) !== false ) {
2289                         return false;
2290                 }
2291
2292                 /**
2293                  * Limit the size of titles to 255 bytes.
2294                  * This is typically the size of the underlying database field.
2295                  * We make an exception for special pages, which don't need to be stored
2296                  * in the database, and may edge over 255 bytes due to subpage syntax
2297                  * for long titles, e.g. [[Special:Block/Long name]]
2298                  */
2299                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2300                   strlen( $dbkey ) > 512 )
2301                 {
2302                         return false;
2303                 }
2304
2305                 /**
2306                  * Normally, all wiki links are forced to have
2307                  * an initial capital letter so [[foo]] and [[Foo]]
2308                  * point to the same place.
2309                  *
2310                  * Don't force it for interwikis, since the other
2311                  * site might be case-sensitive.
2312                  */
2313                 $this->mUserCaseDBKey = $dbkey;
2314                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2315                         $dbkey = $wgContLang->ucfirst( $dbkey );
2316                 }
2317
2318                 /**
2319                  * Can't make a link to a namespace alone...
2320                  * "empty" local links can only be self-links
2321                  * with a fragment identifier.
2322                  */
2323                 if( $dbkey == '' &&
2324                         $this->mInterwiki == '' &&
2325                         $this->mNamespace != NS_MAIN ) {
2326                         return false;
2327                 }
2328                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2329                 // IP names are not allowed for accounts, and can only be referring to
2330                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2331                 // there are numerous ways to present the same IP. Having sp:contribs scan
2332                 // them all is silly and having some show the edits and others not is
2333                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2334                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2335                         IP::sanitizeIP( $dbkey ) : $dbkey;
2336                 // Any remaining initial :s are illegal.
2337                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2338                         return false;
2339                 }
2340
2341                 # Fill fields
2342                 $this->mDbkeyform = $dbkey;
2343                 $this->mUrlform = wfUrlencode( $dbkey );
2344
2345                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2346
2347                 return true;
2348         }
2349
2350         /**
2351          * Set the fragment for this title. Removes the first character from the
2352          * specified fragment before setting, so it assumes you're passing it with
2353          * an initial "#".
2354          *
2355          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2356          * Still in active use privately.
2357          *
2358          * @param $fragment \type{\string} text
2359          */
2360         public function setFragment( $fragment ) {
2361                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2362         }
2363
2364         /**
2365          * Get a Title object associated with the talk page of this article
2366          * @return \type{Title} the object for the talk page
2367          */
2368         public function getTalkPage() {
2369                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2370         }
2371
2372         /**
2373          * Get a title object associated with the subject page of this
2374          * talk page
2375          *
2376          * @return \type{Title} the object for the subject page
2377          */
2378         public function getSubjectPage() {
2379                 // Is this the same title?
2380                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2381                 if( $this->getNamespace() == $subjectNS ) {
2382                         return $this;
2383                 }
2384                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2385         }
2386
2387         /**
2388          * Get an array of Title objects linking to this Title
2389          * Also stores the IDs in the link cache.
2390          *
2391          * WARNING: do not use this function on arbitrary user-supplied titles!
2392          * On heavily-used templates it will max out the memory.
2393          *
2394          * @param array $options may be FOR UPDATE
2395          * @return \type{\arrayof{Title}} the Title objects linking here
2396          */
2397         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2398                 $linkCache = LinkCache::singleton();
2399
2400                 if ( count( $options ) > 0 ) {
2401                         $db = wfGetDB( DB_MASTER );
2402                 } else {
2403                         $db = wfGetDB( DB_SLAVE );
2404                 }
2405
2406                 $res = $db->select( array( 'page', $table ),
2407                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2408                         array(
2409                                 "{$prefix}_from=page_id",
2410                                 "{$prefix}_namespace" => $this->getNamespace(),
2411                                 "{$prefix}_title"     => $this->getDBkey() ),
2412                         __METHOD__,
2413                         $options );
2414
2415                 $retVal = array();
2416                 if ( $db->numRows( $res ) ) {
2417                         foreach( $res as $row ) {
2418                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2419                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2420                                         $retVal[] = $titleObj;
2421                                 }
2422                         }
2423                 }
2424                 $db->freeResult( $res );
2425                 return $retVal;
2426         }
2427
2428         /**
2429          * Get an array of Title objects using this Title as a template
2430          * Also stores the IDs in the link cache.
2431          *
2432          * WARNING: do not use this function on arbitrary user-supplied titles!
2433          * On heavily-used templates it will max out the memory.
2434          *
2435          * @param array $options may be FOR UPDATE
2436          * @return \type{\arrayof{Title}} the Title objects linking here
2437          */
2438         public function getTemplateLinksTo( $options = array() ) {
2439                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2440         }
2441
2442         /**
2443          * Get an array of Title objects referring to non-existent articles linked from this page
2444          *
2445          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2446          * @return \type{\arrayof{Title}} the Title objects
2447          */
2448         public function getBrokenLinksFrom() {
2449                 if ( $this->getArticleId() == 0 ) {
2450                         # All links from article ID 0 are false positives
2451                         return array();
2452                 }
2453
2454                 $dbr = wfGetDB( DB_SLAVE );
2455                 $res = $dbr->select(
2456                         array( 'page', 'pagelinks' ),
2457                         array( 'pl_namespace', 'pl_title' ),
2458                         array(
2459                                 'pl_from' => $this->getArticleId(),
2460                                 'page_namespace IS NULL'
2461                         ),
2462                         __METHOD__, array(),
2463                         array(
2464                                 'page' => array(
2465                                         'LEFT JOIN',
2466                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2467                                 )
2468                         )
2469                 );
2470
2471                 $retVal = array();
2472                 foreach( $res as $row ) {
2473                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2474                 }
2475                 return $retVal;
2476         }
2477
2478
2479         /**
2480          * Get a list of URLs to purge from the Squid cache when this
2481          * page changes
2482          *
2483          * @return \type{\arrayof{\string}} the URLs
2484          */
2485         public function getSquidURLs() {
2486                 global $wgContLang;
2487
2488                 $urls = array(
2489                         $this->getInternalURL(),
2490                         $this->getInternalURL( 'action=history' )
2491                 );
2492
2493                 // purge variant urls as well
2494                 if($wgContLang->hasVariants()){
2495                         $variants = $wgContLang->getVariants();
2496                         foreach($variants as $vCode){
2497                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2498                                 $urls[] = $this->getInternalURL('',$vCode);
2499                         }
2500                 }
2501
2502                 return $urls;
2503         }
2504
2505         /**
2506          * Purge all applicable Squid URLs
2507          */
2508         public function purgeSquid() {
2509                 global $wgUseSquid;
2510                 if ( $wgUseSquid ) {
2511                         $urls = $this->getSquidURLs();
2512                         $u = new SquidUpdate( $urls );
2513                         $u->doUpdate();
2514                 }
2515         }
2516
2517         /**
2518          * Move this page without authentication
2519          * @param &$nt \type{Title} the new page Title
2520          */
2521         public function moveNoAuth( &$nt ) {
2522                 return $this->moveTo( $nt, false );
2523         }
2524
2525         /**
2526          * Check whether a given move operation would be valid.
2527          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2528          * @param &$nt \type{Title} the new title
2529          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2530          *      should be checked
2531          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2532          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2533          */
2534         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2535                 global $wgUser;
2536
2537                 $errors = array();
2538                 if( !$nt ) {
2539                         // Normally we'd add this to $errors, but we'll get
2540                         // lots of syntax errors if $nt is not an object
2541                         return array(array('badtitletext'));
2542                 }
2543                 if( $this->equals( $nt ) ) {
2544                         $errors[] = array('selfmove');
2545                 }
2546                 if( !$this->isMovable() ) {
2547                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2548                 }
2549                 if ( $nt->getInterwiki() != '' ) {
2550                         $errors[] = array( 'immobile-target-namespace-iw' );
2551                 }
2552                 if ( !$nt->isMovable() ) {
2553                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2554                 }
2555
2556                 $oldid = $this->getArticleID();
2557                 $newid = $nt->getArticleID();
2558
2559                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2560                         $errors[] = array('articleexists');
2561                 }
2562                 if ( ( '' == $this->getDBkey() ) ||
2563                          ( !$oldid ) ||
2564                      ( '' == $nt->getDBkey() ) ) {
2565                         $errors[] = array('badarticleerror');
2566                 }
2567
2568                 // Image-specific checks
2569                 if( $this->getNamespace() == NS_FILE ) {
2570                         $file = wfLocalFile( $this );
2571                         if( $file->exists() ) {
2572                                 if( $nt->getNamespace() != NS_FILE ) {
2573                                         $errors[] = array('imagenocrossnamespace');
2574                                 }
2575                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2576                                         $errors[] = array('imageinvalidfilename');
2577                                 }
2578                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2579                                         $errors[] = array('imagetypemismatch');
2580                                 }
2581                         }
2582                 }
2583
2584                 if ( $auth ) {
2585                         $errors = wfMergeErrorArrays( $errors,
2586                                 $this->getUserPermissionsErrors('move', $wgUser),
2587                                 $this->getUserPermissionsErrors('edit', $wgUser),
2588                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2589                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2590                 }
2591
2592                 $match = EditPage::matchSummarySpamRegex( $reason );
2593                 if( $match !== false ) {
2594                         // This is kind of lame, won't display nice
2595                         $errors[] = array('spamprotectiontext');
2596                 }
2597
2598                 $err = null;
2599                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2600                         $errors[] = array('hookaborted', $err);
2601                 }
2602
2603                 # The move is allowed only if (1) the target doesn't exist, or
2604                 # (2) the target is a redirect to the source, and has no history
2605                 # (so we can undo bad moves right after they're done).
2606
2607                 if ( 0 != $newid ) { # Target exists; check for validity
2608                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2609                                 $errors[] = array('articleexists');
2610                         }
2611                 } else {
2612                         $tp = $nt->getTitleProtection();
2613                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2614                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2615                                 $errors[] = array('cantmove-titleprotected');
2616                         }
2617                 }
2618                 if(empty($errors))
2619                         return true;
2620                 return $errors;
2621         }
2622
2623         /**
2624          * Move a title to a new location
2625          * @param &$nt \type{Title} the new title
2626          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2627          *      should be checked
2628          * @param $reason \type{\string} The reason for the move
2629          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2630          *  Ignored if the user doesn't have the suppressredirect right.
2631          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2632          */
2633         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2634                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2635                 if( is_array( $err ) ) {
2636                         return $err;
2637                 }
2638
2639                 // If it is a file, more it first. It is done before all other moving stuff is done because it's hard to revert
2640                 $dbw = wfGetDB( DB_MASTER );
2641                 if( $this->getNamespace() == NS_FILE ) {
2642                         $file = wfLocalFile( $this );
2643                         if( $file->exists() ) {
2644                                 $status = $file->move( $nt );
2645                                 if( !$status->isOk() ) {
2646                                         return $status->getErrorsArray();
2647                                 }
2648                         }
2649                 }
2650
2651                 $pageid = $this->getArticleID();
2652                 $protected = $this->isProtected();
2653                 if( $nt->exists() ) {
2654                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2655                         $pageCountChange = ($createRedirect ? 0 : -1);
2656                 } else { # Target didn't exist, do normal move.
2657                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2658                         $pageCountChange = ($createRedirect ? 1 : 0);
2659                 }
2660
2661                 if( is_array( $err ) ) {
2662                         return $err;
2663                 }
2664                 $redirid = $this->getArticleID();
2665
2666                 // Category memberships include a sort key which may be customized.
2667                 // If it's left as the default (the page title), we need to update
2668                 // the sort key to match the new title.
2669                 //
2670                 // Be careful to avoid resetting cl_timestamp, which may disturb
2671                 // time-based lists on some sites.
2672                 //
2673                 // Warning -- if the sort key is *explicitly* set to the old title,
2674                 // we can't actually distinguish it from a default here, and it'll
2675                 // be set to the new title even though it really shouldn't.
2676                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2677                 $dbw->update( 'categorylinks',
2678                         array(
2679                                 'cl_sortkey' => $nt->getPrefixedText(),
2680                                 'cl_timestamp=cl_timestamp' ),
2681                         array(
2682                                 'cl_from' => $pageid,
2683                                 'cl_sortkey' => $this->getPrefixedText() ),
2684                         __METHOD__ );
2685
2686                 if( $protected ) {
2687                         # Protect the redirect title as the title used to be...
2688                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2689                                 array(
2690                                         'pr_page'    => $redirid,
2691                                         'pr_type'    => 'pr_type',
2692                                         'pr_level'   => 'pr_level',
2693                                         'pr_cascade' => 'pr_cascade',
2694                                         'pr_user'    => 'pr_user',
2695                                         'pr_expiry'  => 'pr_expiry'
2696                                 ),
2697                                 array( 'pr_page' => $pageid ),
2698                                 __METHOD__,
2699                                 array( 'IGNORE' )
2700                         );
2701                         # Update the protection log
2702                         $log = new LogPage( 'protect' );
2703                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2704                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2705                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2706                 }
2707
2708                 # Update watchlists
2709                 $oldnamespace = $this->getNamespace() & ~1;
2710                 $newnamespace = $nt->getNamespace() & ~1;
2711                 $oldtitle = $this->getDBkey();
2712                 $newtitle = $nt->getDBkey();
2713
2714                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2715                         WatchedItem::duplicateEntries( $this, $nt );
2716                 }
2717
2718                 # Update search engine
2719                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2720                 $u->doUpdate();
2721                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2722                 $u->doUpdate();
2723
2724                 # Update site_stats
2725                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2726                         # No longer a content page
2727                         # Not viewed, edited, removing
2728                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2729                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2730                         # Now a content page
2731                         # Not viewed, edited, adding
2732                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2733                 } elseif( $pageCountChange ) {
2734                         # Redirect added
2735                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2736                 } else {
2737                         # Nothing special
2738                         $u = false;
2739                 }
2740                 if( $u )
2741                         $u->doUpdate();
2742                 # Update message cache for interface messages
2743                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2744                         global $wgMessageCache;
2745
2746                         # @bug 17860: old article can be deleted, if this the case,
2747                         # delete it from message cache
2748                         if ( $this->getArticleID() === 0 ) {
2749                                 $wgMessageCache->replace( $this->getDBkey(), false );
2750                         } else {
2751                                 $oldarticle = new Article( $this );
2752                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2753                         }
2754
2755                         $newarticle = new Article( $nt );
2756                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2757                 }
2758
2759                 global $wgUser;
2760                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2761                 return true;
2762         }
2763
2764         /**
2765          * Move page to a title which is at present a redirect to the
2766          * source page
2767          *
2768          * @param &$nt \type{Title} the page to move to, which should currently
2769          *      be a redirect
2770          * @param $reason \type{\string} The reason for the move
2771          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2772          *  Ignored if the user doesn't have the suppressredirect right
2773          */
2774         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2775                 global $wgUseSquid, $wgUser;
2776                 $fname = 'Title::moveOverExistingRedirect';
2777                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2778
2779                 if ( $reason ) {
2780                         $comment .= ": $reason";
2781                 }
2782
2783                 $now = wfTimestampNow();
2784                 $newid = $nt->getArticleID();
2785                 $oldid = $this->getArticleID();
2786                 $latest = $this->getLatestRevID();
2787
2788                 $dbw = wfGetDB( DB_MASTER );
2789
2790                 # Delete the old redirect. We don't save it to history since
2791                 # by definition if we've got here it's rather uninteresting.
2792                 # We have to remove it so that the next step doesn't trigger
2793                 # a conflict on the unique namespace+title index...
2794                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2795                 if ( !$dbw->cascadingDeletes() ) {
2796                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2797                         global $wgUseTrackbacks;
2798                         if ($wgUseTrackbacks)
2799                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2800                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2801                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2802                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2803                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2804                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2805                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2806                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2807                 }
2808
2809                 # Save a null revision in the page's history notifying of the move
2810                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2811                 $nullRevId = $nullRevision->insertOn( $dbw );
2812
2813                 $article = new Article( $this );
2814                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2815
2816                 # Change the name of the target page:
2817                 $dbw->update( 'page',
2818                         /* SET */ array(
2819                                 'page_touched'   => $dbw->timestamp($now),
2820                                 'page_namespace' => $nt->getNamespace(),
2821                                 'page_title'     => $nt->getDBkey(),
2822                                 'page_latest'    => $nullRevId,
2823                         ),
2824                         /* WHERE */ array( 'page_id' => $oldid ),
2825                         $fname
2826                 );
2827                 $nt->resetArticleID( $oldid );
2828
2829                 # Recreate the redirect, this time in the other direction.
2830                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2831                         $mwRedir = MagicWord::get( 'redirect' );
2832                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2833                         $redirectArticle = new Article( $this );
2834                         $newid = $redirectArticle->insertOn( $dbw );
2835                         $redirectRevision = new Revision( array(
2836                                 'page'    => $newid,
2837                                 'comment' => $comment,
2838                                 'text'    => $redirectText ) );
2839                         $redirectRevision->insertOn( $dbw );
2840                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2841
2842                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2843
2844                         # Now, we record the link from the redirect to the new title.
2845                         # It should have no other outgoing links...
2846                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2847                         $dbw->insert( 'pagelinks',
2848                                 array(
2849                                         'pl_from'      => $newid,
2850                                         'pl_namespace' => $nt->getNamespace(),
2851                                         'pl_title'     => $nt->getDBkey() ),
2852                                 $fname );
2853                         $redirectSuppressed = false;
2854                 } else {
2855                         $this->resetArticleID( 0 );
2856                         $redirectSuppressed = true;
2857                 }
2858
2859                 # Log the move
2860                 $log = new LogPage( 'move' );
2861                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2862
2863                 # Purge squid
2864                 if ( $wgUseSquid ) {
2865                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2866                         $u = new SquidUpdate( $urls );
2867                         $u->doUpdate();
2868                 }
2869
2870         }
2871
2872         /**
2873          * Move page to non-existing title.
2874          * @param &$nt \type{Title} the new Title
2875          * @param $reason \type{\string} The reason for the move
2876          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2877          *  Ignored if the user doesn't have the suppressredirect right
2878          */
2879         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2880                 global $wgUseSquid, $wgUser;
2881                 $fname = 'MovePageForm::moveToNewTitle';
2882                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2883                 if ( $reason ) {
2884                         $comment .= wfMsgExt( 'colon-separator',
2885                                 array( 'escapenoentities', 'content' ) );
2886                         $comment .= $reason;
2887                 }
2888
2889                 $newid = $nt->getArticleID();
2890                 $oldid = $this->getArticleID();
2891                 $latest = $this->getLatestRevId();
2892
2893                 $dbw = wfGetDB( DB_MASTER );
2894                 $now = $dbw->timestamp();
2895
2896                 # Save a null revision in the page's history notifying of the move
2897                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2898                 $nullRevId = $nullRevision->insertOn( $dbw );
2899
2900                 $article = new Article( $this );
2901                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2902
2903                 # Rename page entry
2904                 $dbw->update( 'page',
2905                         /* SET */ array(
2906                                 'page_touched'   => $now,
2907                                 'page_namespace' => $nt->getNamespace(),
2908                                 'page_title'     => $nt->getDBkey(),
2909                                 'page_latest'    => $nullRevId,
2910                         ),
2911                         /* WHERE */ array( 'page_id' => $oldid ),
2912                         $fname
2913                 );
2914                 $nt->resetArticleID( $oldid );
2915
2916                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2917                         # Insert redirect
2918                         $mwRedir = MagicWord::get( 'redirect' );
2919                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2920                         $redirectArticle = new Article( $this );
2921                         $newid = $redirectArticle->insertOn( $dbw );
2922                         $redirectRevision = new Revision( array(
2923                                 'page'    => $newid,
2924                                 'comment' => $comment,
2925                                 'text'    => $redirectText ) );
2926                         $redirectRevision->insertOn( $dbw );
2927                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2928
2929                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2930
2931                         # Record the just-created redirect's linking to the page
2932                         $dbw->insert( 'pagelinks',
2933                                 array(
2934                                         'pl_from'      => $newid,
2935                                         'pl_namespace' => $nt->getNamespace(),
2936                                         'pl_title'     => $nt->getDBkey() ),
2937                                 $fname );
2938                         $redirectSuppressed = false;
2939                 } else {
2940                         $this->resetArticleID( 0 );
2941                         $redirectSuppressed = true;
2942                 }
2943
2944                 # Log the move
2945                 $log = new LogPage( 'move' );
2946                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2947
2948                 # Purge caches as per article creation
2949                 Article::onArticleCreate( $nt );
2950
2951                 # Purge old title from squid
2952                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2953                 $this->purgeSquid();
2954
2955         }
2956
2957         /**
2958          * Move this page's subpages to be subpages of $nt
2959          * @param $nt Title Move target
2960          * @param $auth bool Whether $wgUser's permissions should be checked
2961          * @param $reason string The reason for the move
2962          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
2963          *  Ignored if the user doesn't have the 'suppressredirect' right
2964          * @return mixed array with old page titles as keys, and strings (new page titles) or
2965          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
2966          */
2967         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
2968                 global $wgMaximumMovedPages;
2969                 // Check permissions
2970                 if( !$this->userCan( 'move-subpages' ) )
2971                         return array( 'cant-move-subpages' );
2972                 // Do the source and target namespaces support subpages?
2973                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
2974                         return array( 'namespace-nosubpages',
2975                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
2976                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
2977                         return array( 'namespace-nosubpages',
2978                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
2979
2980                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
2981                 $retval = array();
2982                 $count = 0;
2983                 foreach( $subpages as $oldSubpage ) {
2984                         $count++;
2985                         if( $count > $wgMaximumMovedPages ) {
2986                                 $retval[$oldSubpage->getPrefixedTitle()] =
2987                                                 array( 'movepage-max-pages',
2988                                                         $wgMaximumMovedPages );
2989                                 break;
2990                         }
2991
2992                         if( $oldSubpage->getArticleId() == $this->getArticleId() )
2993                                 // When moving a page to a subpage of itself,
2994                                 // don't move it twice
2995                                 continue;
2996                         $newPageName = preg_replace(
2997                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
2998                                         $nt->getDBkey(), $oldSubpage->getDBkey() );
2999                         if( $oldSubpage->isTalkPage() ) {
3000                                 $newNs = $nt->getTalkPage()->getNamespace();
3001                         } else {
3002                                 $newNs = $nt->getSubjectPage()->getNamespace();
3003                         }
3004                         # Bug 14385: we need makeTitleSafe because the new page names may
3005                         # be longer than 255 characters.
3006                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3007
3008                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3009                         if( $success === true ) {
3010                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3011                         } else {
3012                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3013                         }
3014                 }
3015                 return $retval;
3016         }
3017
3018         /**
3019          * Checks if this page is just a one-rev redirect.
3020          * Adds lock, so don't use just for light purposes.
3021          *
3022          * @return \type{\bool} TRUE or FALSE
3023          */
3024         public function isSingleRevRedirect() {
3025                 $dbw = wfGetDB( DB_MASTER );
3026                 # Is it a redirect?
3027                 $row = $dbw->selectRow( 'page',
3028                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3029                         $this->pageCond(),
3030                         __METHOD__,
3031                         array( 'FOR UPDATE' )
3032                 );
3033                 # Cache some fields we may want
3034                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3035                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3036                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3037                 if( !$this->mRedirect ) {
3038                         return false;
3039                 }
3040                 # Does the article have a history?
3041                 $row = $dbw->selectField( array( 'page', 'revision'),
3042                         'rev_id',
3043                         array( 'page_namespace' => $this->getNamespace(),
3044                                 'page_title' => $this->getDBkey(),
3045                                 'page_id=rev_page',
3046                                 'page_latest != rev_id'
3047                         ),
3048                         __METHOD__,
3049                         array( 'FOR UPDATE' )
3050                 );
3051                 # Return true if there was no history
3052                 return ($row === false);
3053         }
3054
3055         /**
3056          * Checks if $this can be moved to a given Title
3057          * - Selects for update, so don't call it unless you mean business
3058          *
3059          * @param &$nt \type{Title} the new title to check
3060          * @return \type{\bool} TRUE or FALSE
3061          */
3062         public function isValidMoveTarget( $nt ) {
3063                 $dbw = wfGetDB( DB_MASTER );
3064                 # Is it an existsing file?
3065                 if( $nt->getNamespace() == NS_FILE ) {
3066                         $file = wfLocalFile( $nt );
3067                         if( $file->exists() ) {
3068                                 wfDebug( __METHOD__ . ": file exists\n" );
3069                                 return false;
3070                         }
3071                 }
3072                 # Is it a redirect with no history?
3073                 if( !$nt->isSingleRevRedirect() ) {
3074                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3075                         return false;
3076                 }
3077                 # Get the article text
3078                 $rev = Revision::newFromTitle( $nt );
3079                 $text = $rev->getText();
3080                 # Does the redirect point to the source?
3081                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3082                 $m = array();
3083                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3084                         $redirTitle = Title::newFromText( $m[1] );
3085                         if( !is_object( $redirTitle ) ||
3086                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3087                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3088                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3089                                 return false;
3090                         }
3091                 } else {
3092                         # Fail safe
3093                         wfDebug( __METHOD__ . ": failsafe\n" );
3094                         return false;
3095                 }
3096                 return true;
3097         }
3098
3099         /**
3100          * Can this title be added to a user's watchlist?
3101          *
3102          * @return \type{\bool} TRUE or FALSE
3103          */
3104         public function isWatchable() {
3105                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3106         }
3107
3108         /**
3109          * Get categories to which this Title belongs and return an array of
3110          * categories' names.
3111          *
3112          * @return \type{\array} array an array of parents in the form:
3113          *      $parent => $currentarticle
3114          */
3115         public function getParentCategories() {
3116                 global $wgContLang;
3117
3118                 $titlekey = $this->getArticleId();
3119                 $dbr = wfGetDB( DB_SLAVE );
3120                 $categorylinks = $dbr->tableName( 'categorylinks' );
3121
3122                 # NEW SQL
3123                 $sql = "SELECT * FROM $categorylinks"
3124                      ." WHERE cl_from='$titlekey'"
3125                          ." AND cl_from <> '0'"
3126                          ." ORDER BY cl_sortkey";
3127
3128                 $res = $dbr->query( $sql );
3129
3130                 if( $dbr->numRows( $res ) > 0 ) {
3131                         foreach( $res as $row )
3132                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3133                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3134                         $dbr->freeResult( $res );
3135                 } else {
3136                         $data = array();
3137                 }
3138                 return $data;
3139         }
3140
3141         /**
3142          * Get a tree of parent categories
3143          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3144          * @return \type{\array} Tree of parent categories
3145          */
3146         public function getParentCategoryTree( $children = array() ) {
3147                 $stack = array();
3148                 $parents = $this->getParentCategories();
3149
3150                 if( $parents ) {
3151                         foreach( $parents as $parent => $current ) {
3152                                 if ( array_key_exists( $parent, $children ) ) {
3153                                         # Circular reference
3154                                         $stack[$parent] = array();
3155                                 } else {
3156                                         $nt = Title::newFromText($parent);
3157                                         if ( $nt ) {
3158                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3159                                         }
3160                                 }
3161                         }
3162                         return $stack;
3163                 } else {
3164                         return array();
3165                 }
3166         }
3167
3168
3169         /**
3170          * Get an associative array for selecting this title from
3171          * the "page" table
3172          *
3173          * @return \type{\array} Selection array
3174          */
3175         public function pageCond() {
3176                 if( $this->mArticleID > 0 ) {
3177                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3178                         return array( 'page_id' => $this->mArticleID );
3179                 } else {
3180                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3181                 }
3182         }
3183
3184         /**
3185          * Get the revision ID of the previous revision
3186          *
3187          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3188          * @param $flags \type{\int} GAID_FOR_UPDATE
3189          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3190          */
3191         public function getPreviousRevisionID( $revId, $flags=0 ) {
3192                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3193                 return $db->selectField( 'revision', 'rev_id',
3194                         array(
3195                                 'rev_page' => $this->getArticleId($flags),
3196                                 'rev_id < ' . intval( $revId )
3197                         ),
3198                         __METHOD__,
3199                         array( 'ORDER BY' => 'rev_id DESC' )
3200                 );
3201         }
3202
3203         /**
3204          * Get the revision ID of the next revision
3205          *
3206          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3207          * @param $flags \type{\int} GAID_FOR_UPDATE
3208          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3209          */
3210         public function getNextRevisionID( $revId, $flags=0 ) {
3211                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3212                 return $db->selectField( 'revision', 'rev_id',
3213                         array(
3214                                 'rev_page' => $this->getArticleId($flags),
3215                                 'rev_id > ' . intval( $revId )
3216                         ),
3217                         __METHOD__,
3218                         array( 'ORDER BY' => 'rev_id' )
3219                 );
3220         }
3221
3222         /**
3223          * Get the first revision of the page
3224          *
3225          * @param $flags \type{\int} GAID_FOR_UPDATE
3226          * @return Revision (or NULL if page doesn't exist)
3227          */
3228         public function getFirstRevision( $flags=0 ) {
3229                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3230                 $pageId = $this->getArticleId($flags);
3231                 if( !$pageId ) return NULL;
3232                 $row = $db->selectRow( 'revision', '*',
3233                         array( 'rev_page' => $pageId ),
3234                         __METHOD__,
3235                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3236                 );
3237                 if( !$row ) {
3238                         return NULL;
3239                 } else {
3240                         return new Revision( $row );
3241                 }
3242         }
3243
3244         /**
3245          * Check if this is a new page
3246          *
3247          * @return bool
3248          */
3249         public function isNewPage() {
3250                 $dbr = wfGetDB( DB_SLAVE );
3251                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3252         }
3253
3254         /**
3255          * Get the oldest revision timestamp of this page
3256          *
3257          * @return string, MW timestamp
3258          */
3259         public function getEarliestRevTime() {
3260                 $dbr = wfGetDB( DB_SLAVE );
3261                 if( $this->exists() ) {
3262                         $min = $dbr->selectField( 'revision',
3263                                 'MIN(rev_timestamp)',
3264                                 array( 'rev_page' => $this->getArticleId() ),
3265                                 __METHOD__ );
3266                         return wfTimestampOrNull( TS_MW, $min );
3267                 }
3268                 return null;
3269         }
3270
3271         /**
3272          * Get the number of revisions between the given revision IDs.
3273          * Used for diffs and other things that really need it.
3274          *
3275          * @param $old \type{\int} Revision ID.
3276          * @param $new \type{\int} Revision ID.
3277          * @return \type{\int} Number of revisions between these IDs.
3278          */
3279         public function countRevisionsBetween( $old, $new ) {
3280                 $dbr = wfGetDB( DB_SLAVE );
3281                 return $dbr->selectField( 'revision', 'count(*)',
3282                         'rev_page = ' . intval( $this->getArticleId() ) .
3283                         ' AND rev_id > ' . intval( $old ) .
3284                         ' AND rev_id < ' . intval( $new ),
3285                         __METHOD__
3286                 );
3287         }
3288
3289         /**
3290          * Compare with another title.
3291          *
3292          * @param \type{Title} $title
3293          * @return \type{\bool} TRUE or FALSE
3294          */
3295         public function equals( Title $title ) {
3296                 // Note: === is necessary for proper matching of number-like titles.
3297                 return $this->getInterwiki() === $title->getInterwiki()
3298                         && $this->getNamespace() == $title->getNamespace()
3299                         && $this->getDBkey() === $title->getDBkey();
3300         }
3301
3302         /**
3303          * Callback for usort() to do title sorts by (namespace, title)
3304          */
3305         public static function compare( $a, $b ) {
3306                 if( $a->getNamespace() == $b->getNamespace() ) {
3307                         return strcmp( $a->getText(), $b->getText() );
3308                 } else {
3309                         return $a->getNamespace() - $b->getNamespace();
3310                 }
3311         }
3312
3313         /**
3314          * Return a string representation of this title
3315          *
3316          * @return \type{\string} String representation of this title
3317          */
3318         public function __toString() {
3319                 return $this->getPrefixedText();
3320         }
3321
3322         /**
3323          * Check if page exists.  For historical reasons, this function simply
3324          * checks for the existence of the title in the page table, and will
3325          * thus return false for interwiki links, special pages and the like.
3326          * If you want to know if a title can be meaningfully viewed, you should
3327          * probably call the isKnown() method instead.
3328          *
3329          * @return \type{\bool} TRUE or FALSE
3330          */
3331         public function exists() {
3332                 return $this->getArticleId() != 0;
3333         }
3334
3335         /**
3336          * Should links to this title be shown as potentially viewable (i.e. as
3337          * "bluelinks"), even if there's no record by this title in the page
3338          * table?
3339          *
3340          * This function is semi-deprecated for public use, as well as somewhat
3341          * misleadingly named.  You probably just want to call isKnown(), which
3342          * calls this function internally.
3343          *
3344          * (ISSUE: Most of these checks are cheap, but the file existence check
3345          * can potentially be quite expensive.  Including it here fixes a lot of
3346          * existing code, but we might want to add an optional parameter to skip
3347          * it and any other expensive checks.)
3348          *
3349          * @return \type{\bool} TRUE or FALSE
3350          */
3351         public function isAlwaysKnown() {
3352                 if( $this->mInterwiki != '' ) {
3353                         return true;  // any interwiki link might be viewable, for all we know
3354                 }
3355                 switch( $this->mNamespace ) {
3356                 case NS_MEDIA:
3357                 case NS_FILE:
3358                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3359                 case NS_SPECIAL:
3360                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3361                 case NS_MAIN:
3362                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3363                 case NS_MEDIAWIKI:
3364                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3365                         // the full l10n of that language to be loaded. That takes much memory and
3366                         // isn't needed. So we strip the language part away.
3367                         // Also, extension messages which are not loaded, are shown as red, because
3368                         // we don't call MessageCache::loadAllMessages.
3369                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3370                         return wfMsgWeirdKey( $basename );  // known system message
3371                 default:
3372                         return false;
3373                 }
3374         }
3375
3376         /**
3377          * Does this title refer to a page that can (or might) be meaningfully
3378          * viewed?  In particular, this function may be used to determine if
3379          * links to the title should be rendered as "bluelinks" (as opposed to
3380          * "redlinks" to non-existent pages).
3381          *
3382          * @return \type{\bool} TRUE or FALSE
3383          */
3384         public function isKnown() {
3385                 return $this->exists() || $this->isAlwaysKnown();
3386         }
3387
3388         /**
3389         * Is this in a namespace that allows actual pages?
3390         *
3391         * @return \type{\bool} TRUE or FALSE
3392         */
3393         public function canExist() {
3394                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3395         }
3396
3397         /**
3398          * Update page_touched timestamps and send squid purge messages for
3399          * pages linking to this title. May be sent to the job queue depending
3400          * on the number of links. Typically called on create and delete.
3401          */
3402         public function touchLinks() {
3403                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3404                 $u->doUpdate();
3405
3406                 if ( $this->getNamespace() == NS_CATEGORY ) {
3407                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3408                         $u->doUpdate();
3409                 }
3410         }
3411
3412         /**
3413          * Get the last touched timestamp
3414          * @param Database $db, optional db
3415          * @return \type{\string} Last touched timestamp
3416          */
3417         public function getTouched( $db = NULL ) {
3418                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3419                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3420                 return $touched;
3421         }
3422
3423         /**
3424          * Get the timestamp when this page was updated since the user last saw it.
3425          * @param User $user
3426          * @return mixed string/NULL
3427          */
3428         public function getNotificationTimestamp( $user = NULL ) {
3429                 global $wgUser, $wgShowUpdatedMarker;
3430                 // Assume current user if none given
3431                 if( !$user ) $user = $wgUser;
3432                 // Check cache first
3433                 $uid = $user->getId();
3434                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3435                         return $this->mNotificationTimestamp[$uid];
3436                 }
3437                 if( !$uid || !$wgShowUpdatedMarker ) {
3438                         return $this->mNotificationTimestamp[$uid] = false;
3439                 }
3440                 // Don't cache too much!
3441                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3442                         $this->mNotificationTimestamp = array();
3443                 }
3444                 $dbr = wfGetDB( DB_SLAVE );
3445                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3446                         'wl_notificationtimestamp',
3447                         array( 'wl_namespace' => $this->getNamespace(),
3448                                 'wl_title' => $this->getDBkey(),
3449                                 'wl_user' => $user->getId()
3450                         ),
3451                         __METHOD__
3452                 );
3453                 return $this->mNotificationTimestamp[$uid];
3454         }
3455
3456         /**
3457          * Get the trackback URL for this page
3458          * @return \type{\string} Trackback URL
3459          */
3460         public function trackbackURL() {
3461                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3462
3463                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3464                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3465         }
3466
3467         /**
3468          * Get the trackback RDF for this page
3469          * @return \type{\string} Trackback RDF
3470          */
3471         public function trackbackRDF() {
3472                 $url = htmlspecialchars($this->getFullURL());
3473                 $title = htmlspecialchars($this->getText());
3474                 $tburl = $this->trackbackURL();
3475
3476                 // Autodiscovery RDF is placed in comments so HTML validator
3477                 // won't barf. This is a rather icky workaround, but seems
3478                 // frequently used by this kind of RDF thingy.
3479                 //
3480                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3481                 return "<!--
3482 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3483          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3484          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3485 <rdf:Description
3486    rdf:about=\"$url\"
3487    dc:identifier=\"$url\"
3488    dc:title=\"$title\"
3489    trackback:ping=\"$tburl\" />
3490 </rdf:RDF>
3491 -->";
3492         }
3493
3494         /**
3495          * Generate strings used for xml 'id' names in monobook tabs
3496          * @return \type{\string} XML 'id' name
3497          */
3498         public function getNamespaceKey() {
3499                 global $wgContLang;
3500                 switch ($this->getNamespace()) {
3501                         case NS_MAIN:
3502                         case NS_TALK:
3503                                 return 'nstab-main';
3504                         case NS_USER:
3505                         case NS_USER_TALK:
3506                                 return 'nstab-user';
3507                         case NS_MEDIA:
3508                                 return 'nstab-media';
3509                         case NS_SPECIAL:
3510                                 return 'nstab-special';
3511                         case NS_PROJECT:
3512                         case NS_PROJECT_TALK:
3513                                 return 'nstab-project';
3514                         case NS_FILE:
3515                         case NS_FILE_TALK:
3516                                 return 'nstab-image';
3517                         case NS_MEDIAWIKI:
3518                         case NS_MEDIAWIKI_TALK:
3519                                 return 'nstab-mediawiki';
3520                         case NS_TEMPLATE:
3521                         case NS_TEMPLATE_TALK:
3522                                 return 'nstab-template';
3523                         case NS_HELP:
3524                         case NS_HELP_TALK:
3525                                 return 'nstab-help';
3526                         case NS_CATEGORY:
3527                         case NS_CATEGORY_TALK:
3528                                 return 'nstab-category';
3529                         default:
3530                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3531                 }
3532         }
3533
3534         /**
3535          * Returns true if this title resolves to the named special page
3536          * @param $name \type{\string} The special page name
3537          */
3538         public function isSpecial( $name ) {
3539                 if ( $this->getNamespace() == NS_SPECIAL ) {
3540                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3541                         if ( $name == $thisName ) {
3542                                 return true;
3543                         }
3544                 }
3545                 return false;
3546         }
3547
3548         /**
3549          * If the Title refers to a special page alias which is not the local default,
3550          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3551          */
3552         public function fixSpecialName() {
3553                 if ( $this->getNamespace() == NS_SPECIAL ) {
3554                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3555                         if ( $canonicalName ) {
3556                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3557                                 if ( $localName != $this->mDbkeyform ) {
3558                                         return Title::makeTitle( NS_SPECIAL, $localName );
3559                                 }
3560                         }
3561                 }
3562                 return $this;
3563         }
3564
3565         /**
3566          * Is this Title in a namespace which contains content?
3567          * In other words, is this a content page, for the purposes of calculating
3568          * statistics, etc?
3569          *
3570          * @return \type{\bool} TRUE or FALSE
3571          */
3572         public function isContentPage() {
3573                 return MWNamespace::isContent( $this->getNamespace() );
3574         }
3575
3576         /**
3577          * Get all extant redirects to this Title
3578          *
3579          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3580          *            NULL to consider all namespaces
3581          * @return \type{\arrayof{Title}} Redirects to this title
3582          */
3583         public function getRedirectsHere( $ns = null ) {
3584                 $redirs = array();
3585
3586                 $dbr = wfGetDB( DB_SLAVE );
3587                 $where = array(
3588                         'rd_namespace' => $this->getNamespace(),
3589                         'rd_title' => $this->getDBkey(),
3590                         'rd_from = page_id'
3591                 );
3592                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3593
3594                 $res = $dbr->select(
3595                         array( 'redirect', 'page' ),
3596                         array( 'page_namespace', 'page_title' ),
3597                         $where,
3598                         __METHOD__
3599                 );
3600
3601
3602                 foreach( $res as $row ) {
3603                         $redirs[] = self::newFromRow( $row );
3604                 }
3605                 return $redirs;
3606         }
3607
3608         /**
3609          * Check if this Title is a valid redirect target
3610          *
3611          * @return \type{\bool} TRUE or FALSE
3612          */
3613         public function isValidRedirectTarget() {
3614                 global $wgInvalidRedirectTargets;
3615
3616                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3617                 if( $this->isSpecial( 'Userlogout' ) ) {
3618                         return false;
3619                 }
3620
3621                 foreach( $wgInvalidRedirectTargets as $target ) {
3622                         if( $this->isSpecial( $target ) ) {
3623                                 return false;
3624                         }
3625                 }
3626
3627                 return true;
3628         }
3629
3630         /**
3631          * Get a backlink cache object
3632          */
3633         function getBacklinkCache() {
3634                 if ( is_null( $this->mBacklinkCache ) ) {
3635                         $this->mBacklinkCache = new BacklinkCache( $this );
3636                 }
3637                 return $this->mBacklinkCache;
3638         }
3639 }