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;
 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( MWNamespace::exists( $this->mNamespace ) ) {
 559                                 return MWNamespace::getCanonicalName( $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( $this->isExternal() ) {
 866                         $ret = $this->getFullURL( $query );
 867                 } elseif( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
 868                         $ret = $this->getFragmentForURL();
 869                 } else {
 870                         $ret = $this->getLocalURL( $query, $variant ) . $this->getFragmentForURL();
 871                 }
 872                 wfProfileOut( __METHOD__ );
 873                 return $ret;
 874         }
 875
 876         /**
 877          * Get an HTML-escaped version of the URL form, suitable for
 878          * using in a link, without a server name or fragment
 879          * @param $query \type{\string} an optional query string
 880          * @return \type{\string} the URL
 881          */
 882         public function escapeLocalURL( $query = '' ) {
 883                 return htmlspecialchars( $this->getLocalURL( $query ) );
 884         }
 885
 886         /**
 887          * Get an HTML-escaped version of the URL form, suitable for
 888          * using in a link, including the server name and fragment
 889          *
 890          * @param $query \type{\string} an optional query string
 891          * @return \type{\string} the URL
 892          */
 893         public function escapeFullURL( $query = '' ) {
 894                 return htmlspecialchars( $this->getFullURL( $query ) );
 895         }
 896
 897         /**
 898          * Get the URL form for an internal link.
 899          * - Used in various Squid-related code, in case we have a different
 900          * internal hostname for the server from the exposed one.
 901          *
 902          * @param $query \type{\string} an optional query string
 903          * @param $variant \type{\string} language variant of url (for sr, zh..)
 904          * @return \type{\string} the URL
 905          */
 906         public function getInternalURL( $query = '', $variant = false ) {
 907                 global $wgInternalServer;
 908                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 909                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 910                 return $url;
 911         }
 912
 913         /**
 914          * Get the edit URL for this Title
 915          * @return \type{\string} the URL, or a null string if this is an
 916          *      interwiki link
 917          */
 918         public function getEditURL() {
 919                 if ( '' != $this->mInterwiki ) { return ''; }
 920                 $s = $this->getLocalURL( 'action=edit' );
 921
 922                 return $s;
 923         }
 924
 925         /**
 926          * Get the HTML-escaped displayable text form.
 927          * Used for the title field in <a> tags.
 928          * @return \type{\string} the text, including any prefixes
 929          */
 930         public function getEscapedText() {
 931                 return htmlspecialchars( $this->getPrefixedText() );
 932         }
 933
 934         /**
 935          * Is this Title interwiki?
 936          * @return \type{\bool}
 937          */
 938         public function isExternal() { return ( '' != $this->mInterwiki ); }
 939
 940         /**
 941          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 942          *
 943          * @param @action \type{\string} Action to check (default: edit)
 944          * @return \type{\bool}
 945          */
 946         public function isSemiProtected( $action = 'edit' ) {
 947                 if( $this->exists() ) {
 948                         $restrictions = $this->getRestrictions( $action );
 949                         if( count( $restrictions ) > 0 ) {
 950                                 foreach( $restrictions as $restriction ) {
 951                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 952                                                 return false;
 953                                 }
 954                         } else {
 955                                 # Not protected
 956                                 return false;
 957                         }
 958                         return true;
 959                 } else {
 960                         # If it doesn't exist, it can't be protected
 961                         return false;
 962                 }
 963         }
 964
 965         /**
 966          * Does the title correspond to a protected article?
 967          * @param $what \type{\string} the action the page is protected from,
 968          * by default checks all actions.
 969          * @return \type{\bool}
 970          */
 971         public function isProtected( $action = '' ) {
 972                 global $wgRestrictionLevels;
 973
 974                 $restrictionTypes = $this->getRestrictionTypes();
 975
 976                 # Special pages have inherent protection
 977                 if( $this->getNamespace() == NS_SPECIAL )
 978                         return true;
 979
 980                 # Check regular protection levels
 981                 foreach( $restrictionTypes as $type ){
 982                         if( $action == $type || $action == '' ) {
 983                                 $r = $this->getRestrictions( $type );
 984                                 foreach( $wgRestrictionLevels as $level ) {
 985                                         if( in_array( $level, $r ) && $level != '' ) {
 986                                                 return true;
 987                                         }
 988                                 }
 989                         }
 990                 }
 991
 992                 return false;
 993         }
 994
 995         /**
 996          * Is $wgUser watching this page?
 997          * @return \type{\bool}
 998          */
 999         public function userIsWatching() {
1000                 global $wgUser;
1001
1002                 if ( is_null( $this->mWatched ) ) {
1003                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1004                                 $this->mWatched = false;
1005                         } else {
1006                                 $this->mWatched = $wgUser->isWatched( $this );
1007                         }
1008                 }
1009                 return $this->mWatched;
1010         }
1011
1012         /**
1013          * Can $wgUser perform $action on this page?
1014          * This skips potentially expensive cascading permission checks
1015          * as well as avoids expensive error formatting
1016          *
1017          * Suitable for use for nonessential UI controls in common cases, but
1018          * _not_ for functional access control.
1019          *
1020          * May provide false positives, but should never provide a false negative.
1021          *
1022          * @param $action \type{\string} action that permission needs to be checked for
1023          * @return \type{\bool}
1024          */
1025         public function quickUserCan( $action ) {
1026                 return $this->userCan( $action, false );
1027         }
1028
1029         /**
1030          * Determines if $wgUser is unable to edit this page because it has been protected
1031          * by $wgNamespaceProtection.
1032          *
1033          * @return \type{\bool}
1034          */
1035         public function isNamespaceProtected() {
1036                 global $wgNamespaceProtection, $wgUser;
1037                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1038                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1039                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1040                                         return true;
1041                         }
1042                 }
1043                 return false;
1044         }
1045
1046         /**
1047          * Can $wgUser perform $action on this page?
1048          * @param $action \type{\string} action that permission needs to be checked for
1049          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1050          * @return \type{\bool}
1051          */
1052         public function userCan( $action, $doExpensiveQueries = true ) {
1053                 global $wgUser;
1054                 return ($this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries, true ) === array());
1055         }
1056
1057         /**
1058          * Can $user perform $action on this page?
1059          *
1060          * FIXME: This *does not* check throttles (User::pingLimiter()).
1061          *
1062          * @param $action \type{\string}action that permission needs to be checked for
1063          * @param $user \type{User} user to check
1064          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1065          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1066          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1067          */
1068         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1069                 if( !StubObject::isRealObject( $user ) ) {
1070                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1071                         global $wgUser;
1072                         $wgUser->_unstub( '', 5 );
1073                         $user = $wgUser;
1074                 }
1075                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1076
1077                 global $wgContLang;
1078                 global $wgLang;
1079                 global $wgEmailConfirmToEdit;
1080
1081                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1082                         $errors[] = array( 'confirmedittext' );
1083                 }
1084
1085                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1086                 if ( $action != 'read' && $action != 'createaccount' && $user->isBlockedFrom( $this ) ) {
1087                         $block = $user->mBlock;
1088
1089                         // This is from OutputPage::blockedPage
1090                         // Copied at r23888 by werdna
1091
1092                         $id = $user->blockedBy();
1093                         $reason = $user->blockedFor();
1094                         if( $reason == '' ) {
1095                                 $reason = wfMsg( 'blockednoreason' );
1096                         }
1097                         $ip = wfGetIP();
1098
1099                         if ( is_numeric( $id ) ) {
1100                                 $name = User::whoIs( $id );
1101                         } else {
1102                                 $name = $id;
1103                         }
1104
1105                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1106                         $blockid = $block->mId;
1107                         $blockExpiry = $user->mBlock->mExpiry;
1108                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1109
1110                         if ( $blockExpiry == 'infinity' ) {
1111                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1112                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1113
1114                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1115                                         if ( strpos( $option, ':' ) == false )
1116                                                 continue;
1117
1118                                         list ($show, $value) = explode( ":", $option );
1119
1120                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1121                                                 $blockExpiry = $show;
1122                                                 break;
1123                                         }
1124                                 }
1125                         } else {
1126                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1127                         }
1128
1129                         $intended = $user->mBlock->mAddress;
1130
1131                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1132                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1133                 }
1134
1135                 // Remove the errors being ignored.
1136
1137                 foreach( $errors as $index => $error ) {
1138                         $error_key = is_array($error) ? $error[0] : $error;
1139
1140                         if (in_array( $error_key, $ignoreErrors )) {
1141                                 unset($errors[$index]);
1142                         }
1143                 }
1144
1145                 return $errors;
1146         }
1147
1148         /**
1149          * Can $user perform $action on this page? This is an internal function,
1150          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1151          * checks on wfReadOnly() and blocks)
1152          *
1153          * @param $action \type{\string} action that permission needs to be checked for
1154          * @param $user \type{User} user to check
1155          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1156          * @param $short \type{\bool} Set this to true to stop after the first permission error.
1157          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1158          */
1159         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries=true, $short=false ) {
1160                 wfProfileIn( __METHOD__ );
1161
1162                 $errors = array();
1163
1164                 // First stop is permissions checks, which fail most often, and which are easiest to test.
1165                 if ( $action == 'move' ) {
1166                         if( !$user->isAllowed( 'move-rootuserpages' )
1167                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1168                         {
1169                                 // Show user page-specific message only if the user can move other pages
1170                                 $errors[] = array( 'cant-move-user-page' );
1171                         }
1172
1173                         // Check if user is allowed to move files if it's a file
1174                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1175                                 $errors[] = array( 'movenotallowedfile' );
1176                         }
1177
1178                         if( !$user->isAllowed( 'move' ) ) {
1179                                 // User can't move anything
1180                                 global $wgGroupPermissions;
1181                                 $userCanMove = false;
1182                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1183                                         $userCanMove = $wgGroupPermissions['user']['move'];
1184                                 }
1185                                 $autoconfirmedCanMove = false;
1186                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1187                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1188                                 }
1189                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1190                                         // custom message if logged-in users without any special rights can move
1191                                         $errors[] = array ( 'movenologintext' );
1192                                 } else {
1193                                         $errors[] = array ('movenotallowed');
1194                                 }
1195                         }
1196                 } elseif ( $action == 'create' ) {
1197                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1198                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1199                         {
1200                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1201                         }
1202                 } elseif( $action == 'move-target' ) {
1203                         if( !$user->isAllowed( 'move' ) ) {
1204                                 // User can't move anything
1205                                 $errors[] = array ('movenotallowed');
1206                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1207                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1208                         {
1209                                 // Show user page-specific message only if the user can move other pages
1210                                 $errors[] = array( 'cant-move-to-user-page' );
1211                         }
1212                 } elseif( !$user->isAllowed( $action ) ) {
1213                         $return = null;
1214
1215                         // We avoid expensive display logic for quickUserCan's and such
1216                         $groups = false;
1217                         if (!$short) {
1218                                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1219                                         User::getGroupsWithPermission( $action ) );
1220                         }
1221
1222                         if( $groups ) {
1223                                 $return = array( 'badaccess-groups',
1224                                         array( implode( ', ', $groups ), count( $groups ) ) );
1225                         } else {
1226                                 $return = array( "badaccess-group0" );
1227                         }
1228                         $errors[] = $return;
1229                 }
1230
1231                 # Short-circuit point
1232                 if( $short && count($errors) > 0 ) {
1233                         wfProfileOut( __METHOD__ );
1234                         return $errors;
1235                 }
1236
1237                 // Use getUserPermissionsErrors instead
1238                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1239                         wfProfileOut( __METHOD__ );
1240                         return $result ? array() : array( array( 'badaccess-group0' ) );
1241                 }
1242                 // Check getUserPermissionsErrors hook
1243                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1244                         if( is_array($result) && count($result) && !is_array($result[0]) )
1245                                 $errors[] = $result; # A single array representing an error
1246                         else if( is_array($result) && is_array($result[0]) )
1247                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1248                         else if( $result !== '' && is_string($result) )
1249                                 $errors[] = array($result); # A string representing a message-id
1250                         else if( $result === false )
1251                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1252                 }
1253                 # Short-circuit point
1254                 if( $short && count($errors) > 0 ) {
1255                         wfProfileOut( __METHOD__ );
1256                         return $errors;
1257                 }
1258                 // Check getUserPermissionsErrorsExpensive hook
1259                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1260                         if( is_array($result) && count($result) && !is_array($result[0]) )
1261                                 $errors[] = $result; # A single array representing an error
1262                         else if( is_array($result) && is_array($result[0]) )
1263                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1264                         else if( $result !== '' && is_string($result) )
1265                                 $errors[] = array($result); # A string representing a message-id
1266                         else if( $result === false )
1267                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1268                 }
1269                 # Short-circuit point
1270                 if( $short && count($errors) > 0 ) {
1271                         wfProfileOut( __METHOD__ );
1272                         return $errors;
1273                 }
1274
1275                 # Only 'createaccount' and 'execute' can be performed on
1276                 # special pages, which don't actually exist in the DB.
1277                 $specialOKActions = array( 'createaccount', 'execute' );
1278                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1279                         $errors[] = array('ns-specialprotected');
1280                 }
1281
1282                 # Check $wgNamespaceProtection for restricted namespaces
1283                 if( $this->isNamespaceProtected() ) {
1284                         $ns = $this->getNamespace() == NS_MAIN ?
1285                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1286                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1287                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1288                 }
1289
1290                 # Protect css/js subpages of user pages
1291                 # XXX: this might be better using restrictions
1292                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssSubpage()
1293                 #      and $this->userCanEditJsSubpage() from working
1294                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1295                 if( $this->isCssSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('editusercss') )
1296                         && $action != 'patrol'
1297                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1298                 {
1299                         $errors[] = array('customcssjsprotected');
1300                 } else if( $this->isJsSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('edituserjs') )
1301                         && $action != 'patrol'
1302                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1303                 {
1304                         $errors[] = array('customcssjsprotected');
1305                 }
1306
1307                 # Check against page_restrictions table requirements on this
1308                 # page. The user must possess all required rights for this action.
1309                 foreach( $this->getRestrictions($action) as $right ) {
1310                         // Backwards compatibility, rewrite sysop -> protect
1311                         if( $right == 'sysop' ) {
1312                                 $right = 'protect';
1313                         }
1314                         if( '' != $right && !$user->isAllowed( $right ) ) {
1315                                 // Users with 'editprotected' permission can edit protected pages
1316                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1317                                         // Users with 'editprotected' permission cannot edit protected pages
1318                                         // with cascading option turned on.
1319                                         if( $this->mCascadeRestriction ) {
1320                                                 $errors[] = array( 'protectedpagetext', $right );
1321                                         }
1322                                 } else {
1323                                         $errors[] = array( 'protectedpagetext', $right );
1324                                 }
1325                         }
1326                 }
1327                 # Short-circuit point
1328                 if( $short && count($errors) > 0 ) {
1329                         wfProfileOut( __METHOD__ );
1330                         return $errors;
1331                 }
1332
1333                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1334                         # We /could/ use the protection level on the source page, but it's fairly ugly
1335                         #  as we have to establish a precedence hierarchy for pages included by multiple
1336                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1337                         #  as they could remove the protection anyway.
1338                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1339                         # Cascading protection depends on more than this page...
1340                         # Several cascading protected pages may include this page...
1341                         # Check each cascading level
1342                         # This is only for protection restrictions, not for all actions
1343                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1344                                 foreach( $restrictions[$action] as $right ) {
1345                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1346                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1347                                                 $pages = '';
1348                                                 foreach( $cascadingSources as $page )
1349                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1350                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1351                                         }
1352                                 }
1353                         }
1354                 }
1355                 # Short-circuit point
1356                 if( $short && count($errors) > 0 ) {
1357                         wfProfileOut( __METHOD__ );
1358                         return $errors;
1359                 }
1360
1361                 if( $action == 'protect' ) {
1362                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1363                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1364                         }
1365                 }
1366
1367                 if( $action == 'create' ) {
1368                         $title_protection = $this->getTitleProtection();
1369                         if( is_array($title_protection) ) {
1370                                 extract($title_protection); // is this extract() really needed?
1371
1372                                 if( $pt_create_perm == 'sysop' ) {
1373                                         $pt_create_perm = 'protect'; // B/C
1374                                 }
1375                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1376                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1377                                 }
1378                         }
1379                 } elseif( $action == 'move' ) {
1380                         // Check for immobile pages
1381                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1382                                 // Specific message for this case
1383                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1384                         } elseif( !$this->isMovable() ) {
1385                                 // Less specific message for rarer cases
1386                                 $errors[] = array( 'immobile-page' );
1387                         }
1388                 } elseif( $action == 'move-target' ) {
1389                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1390                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1391                         } elseif( !$this->isMovable() ) {
1392                                 $errors[] = array( 'immobile-target-page' );
1393                         }
1394                 }
1395
1396                 wfProfileOut( __METHOD__ );
1397                 return $errors;
1398         }
1399
1400         /**
1401          * Is this title subject to title protection?
1402          * @return \type{\mixed} An associative array representing any existent title
1403          *   protection, or false if there's none.
1404          */
1405         private function getTitleProtection() {
1406                 // Can't protect pages in special namespaces
1407                 if ( $this->getNamespace() < 0 ) {
1408                         return false;
1409                 }
1410
1411                 // Can't protect pages that exist.
1412                 if ($this->exists()) {
1413                         return false;
1414                 }
1415
1416                 $dbr = wfGetDB( DB_SLAVE );
1417                 $res = $dbr->select( 'protected_titles', '*',
1418                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1419                         __METHOD__ );
1420
1421                 if ($row = $dbr->fetchRow( $res )) {
1422                         return $row;
1423                 } else {
1424                         return false;
1425                 }
1426         }
1427
1428         /**
1429          * Update the title protection status
1430          * @param $create_perm \type{\string} Permission required for creation
1431          * @param $reason \type{\string} Reason for protection
1432          * @param $expiry \type{\string} Expiry timestamp
1433          */
1434         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1435                 global $wgUser,$wgContLang;
1436
1437                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1438                         && $expiry == $this->mRestrictionsExpiry['create']) {
1439                         // No change
1440                         return true;
1441                 }
1442
1443                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1444
1445                 $dbw = wfGetDB( DB_MASTER );
1446
1447                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1448
1449                 $expiry_description = '';
1450                 if ( $encodedExpiry != 'infinity' ) {
1451                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',$wgContLang->timeanddate( $expiry ),
1452                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1453                 }
1454                 else {
1455                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1456                 }
1457
1458                 # Update protection table
1459                 if ($create_perm != '' ) {
1460                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1461                                 array(
1462                                         'pt_namespace' => $namespace,
1463                                         'pt_title' => $title,
1464                                         'pt_create_perm' => $create_perm,
1465                                         'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw),
1466                                         'pt_expiry' => $encodedExpiry,
1467                                         'pt_user' => $wgUser->getId(),
1468                                         'pt_reason' => $reason,
1469                                 ), __METHOD__
1470                         );
1471                 } else {
1472                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1473                                 'pt_title' => $title ), __METHOD__ );
1474                 }
1475                 # Update the protection log
1476                 if( $dbw->affectedRows() ) {
1477                         $log = new LogPage( 'protect' );
1478
1479                         if( $create_perm ) {
1480                                 $params = array("[create=$create_perm] $expiry_description",'');
1481                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
1482                         } else {
1483                                 $log->addEntry( 'unprotect', $this, $reason );
1484                         }
1485                 }
1486
1487                 return true;
1488         }
1489
1490         /**
1491          * Remove any title protection due to page existing
1492          */
1493         public function deleteTitleProtection() {
1494                 $dbw = wfGetDB( DB_MASTER );
1495
1496                 $dbw->delete( 'protected_titles',
1497                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1498                         __METHOD__ );
1499         }
1500
1501         /**
1502          * Would anybody with sufficient privileges be able to move this page?
1503          * Some pages just aren't movable.
1504          *
1505          * @return \type{\bool} TRUE or FALSE
1506          */
1507         public function isMovable() {
1508                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1509         }
1510
1511         /**
1512          * Can $wgUser read this page?
1513          * @return \type{\bool} TRUE or FALSE
1514          * @todo fold these checks into userCan()
1515          */
1516         public function userCanRead() {
1517                 global $wgUser, $wgGroupPermissions;
1518
1519                 static $useShortcut = null;
1520
1521                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1522                 if( is_null( $useShortcut ) ) {
1523                         global $wgRevokePermissions;
1524                         $useShortcut = true;
1525                         if( empty( $wgGroupPermissions['*']['read'] ) ) {
1526                                 # Not a public wiki, so no shortcut
1527                                 $useShortcut = false;
1528                         } elseif( !empty( $wgRevokePermissions ) ) {
1529                                 /*
1530                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1531                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1532                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1533                                  * reading is allowed.
1534                                  */
1535                                 foreach( $wgRevokePermissions as $perms ) {
1536                                         if( !empty( $perms['read'] ) ) {
1537                                                 # We might be removing the read right from the user, so no shortcut
1538                                                 $useShortcut = false;
1539                                                 break;
1540                                         }
1541                                 }
1542                         }
1543                 }
1544
1545                 $result = null;
1546                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1547                 if ( $result !== null ) {
1548                         return $result;
1549                 }
1550
1551                 # Shortcut for public wikis, allows skipping quite a bit of code
1552                 if ( $useShortcut )
1553                         return true;
1554
1555                 if( $wgUser->isAllowed( 'read' ) ) {
1556                         return true;
1557                 } else {
1558                         global $wgWhitelistRead;
1559
1560                         /**
1561                          * Always grant access to the login page.
1562                          * Even anons need to be able to log in.
1563                         */
1564                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1565                                 return true;
1566                         }
1567
1568                         /**
1569                          * Bail out if there isn't whitelist
1570                          */
1571                         if( !is_array($wgWhitelistRead) ) {
1572                                 return false;
1573                         }
1574
1575                         /**
1576                          * Check for explicit whitelisting
1577                          */
1578                         $name = $this->getPrefixedText();
1579                         $dbName = $this->getPrefixedDBKey();
1580                         // Check with and without underscores
1581                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1582                                 return true;
1583
1584                         /**
1585                          * Old settings might have the title prefixed with
1586                          * a colon for main-namespace pages
1587                          */
1588                         if( $this->getNamespace() == NS_MAIN ) {
1589                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1590                                         return true;
1591                         }
1592
1593                         /**
1594                          * If it's a special page, ditch the subpage bit
1595                          * and check again
1596                          */
1597                         if( $this->getNamespace() == NS_SPECIAL ) {
1598                                 $name = $this->getDBkey();
1599                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1600                                 if ( $name === false ) {
1601                                         # Invalid special page, but we show standard login required message
1602                                         return false;
1603                                 }
1604
1605                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1606                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1607                                         return true;
1608                         }
1609
1610                 }
1611                 return false;
1612         }
1613
1614         /**
1615          * Is this a talk page of some sort?
1616          * @return \type{\bool} TRUE or FALSE
1617          */
1618         public function isTalkPage() {
1619                 return MWNamespace::isTalk( $this->getNamespace() );
1620         }
1621
1622         /**
1623          * Is this a subpage?
1624          * @return \type{\bool} TRUE or FALSE
1625          */
1626         public function isSubpage() {
1627                 return MWNamespace::hasSubpages( $this->mNamespace )
1628                         ? strpos( $this->getText(), '/' ) !== false
1629                         : false;
1630         }
1631
1632         /**
1633          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1634          * @return \type{\bool} TRUE or FALSE
1635          */
1636         public function hasSubpages() {
1637                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1638                         # Duh
1639                         return false;
1640                 }
1641
1642                 # We dynamically add a member variable for the purpose of this method
1643                 # alone to cache the result.  There's no point in having it hanging
1644                 # around uninitialized in every Title object; therefore we only add it
1645                 # if needed and don't declare it statically.
1646                 if( isset( $this->mHasSubpages ) ) {
1647                         return $this->mHasSubpages;
1648                 }
1649
1650                 $subpages = $this->getSubpages( 1 );
1651                 if( $subpages instanceof TitleArray )
1652                         return $this->mHasSubpages = (bool)$subpages->count();
1653                 return $this->mHasSubpages = false;
1654         }
1655
1656         /**
1657          * Get all subpages of this page.
1658          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1659          * @return mixed TitleArray, or empty array if this page's namespace
1660          *  doesn't allow subpages
1661          */
1662         public function getSubpages( $limit = -1 ) {
1663                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1664                         return array();
1665
1666                 $dbr = wfGetDB( DB_SLAVE );
1667                 $conds['page_namespace'] = $this->getNamespace();
1668                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
1669                 $options = array();
1670                 if( $limit > -1 )
1671                         $options['LIMIT'] = $limit;
1672                 return $this->mSubpages = TitleArray::newFromResult(
1673                         $dbr->select( 'page',
1674                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1675                                 $conds,
1676                                 __METHOD__,
1677                                 $options
1678                         )
1679                 );
1680         }
1681
1682         /**
1683          * Could this page contain custom CSS or JavaScript, based
1684          * on the title?
1685          *
1686          * @return \type{\bool} TRUE or FALSE
1687          */
1688         public function isCssOrJsPage() {
1689                 return $this->mNamespace == NS_MEDIAWIKI
1690                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1691         }
1692
1693         /**
1694          * Is this a .css or .js subpage of a user page?
1695          * @return \type{\bool} TRUE or FALSE
1696          */
1697         public function isCssJsSubpage() {
1698                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1699         }
1700         /**
1701          * Is this a *valid* .css or .js subpage of a user page?
1702          * Check that the corresponding skin exists
1703          * @return \type{\bool} TRUE or FALSE
1704          */
1705         public function isValidCssJsSubpage() {
1706                 if ( $this->isCssJsSubpage() ) {
1707                         $skinNames = Skin::getSkinNames();
1708                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1709                 } else {
1710                         return false;
1711                 }
1712         }
1713         /**
1714          * Trim down a .css or .js subpage title to get the corresponding skin name
1715          */
1716         public function getSkinFromCssJsSubpage() {
1717                 $subpage = explode( '/', $this->mTextform );
1718                 $subpage = $subpage[ count( $subpage ) - 1 ];
1719                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1720         }
1721         /**
1722          * Is this a .css subpage of a user page?
1723          * @return \type{\bool} TRUE or FALSE
1724          */
1725         public function isCssSubpage() {
1726                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1727         }
1728         /**
1729          * Is this a .js subpage of a user page?
1730          * @return \type{\bool} TRUE or FALSE
1731          */
1732         public function isJsSubpage() {
1733                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1734         }
1735         /**
1736          * Protect css subpages of user pages: can $wgUser edit
1737          * this page?
1738          *
1739          * @return \type{\bool} TRUE or FALSE
1740          * @todo XXX: this might be better using restrictions
1741          */
1742         public function userCanEditCssSubpage() {
1743                 global $wgUser;
1744                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('editusercss') )
1745                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1746         }
1747         /**
1748          * Protect js subpages of user pages: can $wgUser edit
1749          * this page?
1750          *
1751          * @return \type{\bool} TRUE or FALSE
1752          * @todo XXX: this might be better using restrictions
1753          */
1754         public function userCanEditJsSubpage() {
1755                 global $wgUser;
1756                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('edituserjs') )
1757                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1758         }
1759
1760         /**
1761          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1762          *
1763          * @return \type{\bool} If the page is subject to cascading restrictions.
1764          */
1765         public function isCascadeProtected() {
1766                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1767                 return ( $sources > 0 );
1768         }
1769
1770         /**
1771          * Cascading protection: Get the source of any cascading restrictions on this page.
1772          *
1773          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1774          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1775          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1776          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1777          */
1778         public function getCascadeProtectionSources( $get_pages = true ) {
1779                 $pagerestrictions = array();
1780
1781                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1782                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1783                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1784                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1785                 }
1786
1787                 wfProfileIn( __METHOD__ );
1788
1789                 $dbr = wfGetDB( DB_SLAVE );
1790
1791                 if ( $this->getNamespace() == NS_FILE ) {
1792                         $tables = array ('imagelinks', 'page_restrictions');
1793                         $where_clauses = array(
1794                                 'il_to' => $this->getDBkey(),
1795                                 'il_from=pr_page',
1796                                 'pr_cascade' => 1 );
1797                 } else {
1798                         $tables = array ('templatelinks', 'page_restrictions');
1799                         $where_clauses = array(
1800                                 'tl_namespace' => $this->getNamespace(),
1801                                 'tl_title' => $this->getDBkey(),
1802                                 'tl_from=pr_page',
1803                                 'pr_cascade' => 1 );
1804                 }
1805
1806                 if ( $get_pages ) {
1807                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1808                         $where_clauses[] = 'page_id=pr_page';
1809                         $tables[] = 'page';
1810                 } else {
1811                         $cols = array( 'pr_expiry' );
1812                 }
1813
1814                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1815
1816                 $sources = $get_pages ? array() : false;
1817                 $now = wfTimestampNow();
1818                 $purgeExpired = false;
1819
1820                 foreach( $res as $row ) {
1821                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1822                         if( $expiry > $now ) {
1823                                 if ($get_pages) {
1824                                         $page_id = $row->pr_page;
1825                                         $page_ns = $row->page_namespace;
1826                                         $page_title = $row->page_title;
1827                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1828                                         # Add groups needed for each restriction type if its not already there
1829                                         # Make sure this restriction type still exists
1830
1831                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
1832                                                 $pagerestrictions[$row->pr_type] = array();
1833                                         }
1834
1835                                         if ( isset($pagerestrictions[$row->pr_type]) &&
1836                                                         !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1837                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1838                                         }
1839                                 } else {
1840                                         $sources = true;
1841                                 }
1842                         } else {
1843                                 // Trigger lazy purge of expired restrictions from the db
1844                                 $purgeExpired = true;
1845                         }
1846                 }
1847                 if( $purgeExpired ) {
1848                         Title::purgeExpiredRestrictions();
1849                 }
1850
1851                 wfProfileOut( __METHOD__ );
1852
1853                 if ( $get_pages ) {
1854                         $this->mCascadeSources = $sources;
1855                         $this->mCascadingRestrictions = $pagerestrictions;
1856                 } else {
1857                         $this->mHasCascadingRestrictions = $sources;
1858                 }
1859                 return array( $sources, $pagerestrictions );
1860         }
1861
1862         function areRestrictionsCascading() {
1863                 if (!$this->mRestrictionsLoaded) {
1864                         $this->loadRestrictions();
1865                 }
1866
1867                 return $this->mCascadeRestriction;
1868         }
1869
1870         /**
1871          * Loads a string into mRestrictions array
1872          * @param $res \type{Resource} restrictions as an SQL result.
1873          */
1874         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
1875                 $rows = array();
1876                 $dbr = wfGetDB( DB_SLAVE );
1877
1878                 while( $row = $dbr->fetchObject( $res ) ) {
1879                         $rows[] = $row;
1880                 }
1881
1882                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
1883         }
1884
1885         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
1886                 $dbr = wfGetDB( DB_SLAVE );
1887
1888                 $restrictionTypes = $this->getRestrictionTypes();
1889
1890                 foreach( $restrictionTypes as $type ){
1891                         $this->mRestrictions[$type] = array();
1892                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1893                 }
1894
1895                 $this->mCascadeRestriction = false;
1896
1897                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1898
1899                 if ( $oldFashionedRestrictions === null ) {
1900                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1901                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1902                 }
1903
1904                 if ($oldFashionedRestrictions != '') {
1905
1906                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1907                                 $temp = explode( '=', trim( $restrict ) );
1908                                 if(count($temp) == 1) {
1909                                         // old old format should be treated as edit/move restriction
1910                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1911                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1912                                 } else {
1913                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1914                                 }
1915                         }
1916
1917                         $this->mOldRestrictions = true;
1918
1919                 }
1920
1921                 if( count($rows) ) {
1922                         # Current system - load second to make them override.
1923                         $now = wfTimestampNow();
1924                         $purgeExpired = false;
1925
1926                         foreach( $rows as $row ) {
1927                                 # Cycle through all the restrictions.
1928
1929                                 // Don't take care of restrictions types that aren't allowed
1930
1931                                 if( !in_array( $row->pr_type, $restrictionTypes ) )
1932                                         continue;
1933
1934                                 // This code should be refactored, now that it's being used more generally,
1935                                 // But I don't really see any harm in leaving it in Block for now -werdna
1936                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1937
1938                                 // Only apply the restrictions if they haven't expired!
1939                                 if ( !$expiry || $expiry > $now ) {
1940                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1941                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1942
1943                                         $this->mCascadeRestriction |= $row->pr_cascade;
1944                                 } else {
1945                                         // Trigger a lazy purge of expired restrictions
1946                                         $purgeExpired = true;
1947                                 }
1948                         }
1949
1950                         if( $purgeExpired ) {
1951                                 Title::purgeExpiredRestrictions();
1952                         }
1953                 }
1954
1955                 $this->mRestrictionsLoaded = true;
1956         }
1957
1958         /**
1959          * Load restrictions from the page_restrictions table
1960          */
1961         public function loadRestrictions( $oldFashionedRestrictions = null ) {
1962                 if( !$this->mRestrictionsLoaded ) {
1963                         if ($this->exists()) {
1964                                 $dbr = wfGetDB( DB_SLAVE );
1965
1966                                 $res = $dbr->select( 'page_restrictions', '*',
1967                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1968
1969                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
1970                         } else {
1971                                 $title_protection = $this->getTitleProtection();
1972
1973                                 if (is_array($title_protection)) {
1974                                         extract($title_protection);
1975
1976                                         $now = wfTimestampNow();
1977                                         $expiry = Block::decodeExpiry($pt_expiry);
1978
1979                                         if (!$expiry || $expiry > $now) {
1980                                                 // Apply the restrictions
1981                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1982                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1983                                         } else { // Get rid of the old restrictions
1984                                                 Title::purgeExpiredRestrictions();
1985                                         }
1986                                 } else {
1987                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1988                                 }
1989                                 $this->mRestrictionsLoaded = true;
1990                         }
1991                 }
1992         }
1993
1994         /**
1995          * Purge expired restrictions from the page_restrictions table
1996          */
1997         static function purgeExpiredRestrictions() {
1998                 $dbw = wfGetDB( DB_MASTER );
1999                 $dbw->delete( 'page_restrictions',
2000                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2001                         __METHOD__ );
2002
2003                 $dbw->delete( 'protected_titles',
2004                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2005                         __METHOD__ );
2006         }
2007
2008         /**
2009          * Accessor/initialisation for mRestrictions
2010          *
2011          * @param $action \type{\string} action that permission needs to be checked for
2012          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
2013          */
2014         public function getRestrictions( $action ) {
2015                 if( !$this->mRestrictionsLoaded ) {
2016                         $this->loadRestrictions();
2017                 }
2018                 return isset( $this->mRestrictions[$action] )
2019                                 ? $this->mRestrictions[$action]
2020                                 : array();
2021         }
2022
2023         /**
2024          * Get the expiry time for the restriction against a given action
2025          * @return 14-char timestamp, or 'infinity' if the page is protected forever
2026          * or not protected at all, or false if the action is not recognised.
2027          */
2028         public function getRestrictionExpiry( $action ) {
2029                 if( !$this->mRestrictionsLoaded ) {
2030                         $this->loadRestrictions();
2031                 }
2032                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2033         }
2034
2035         /**
2036          * Is there a version of this page in the deletion archive?
2037          * @return \type{\int} the number of archived revisions
2038          */
2039         public function isDeleted() {
2040                 if( $this->getNamespace() < 0 ) {
2041                         $n = 0;
2042                 } else {
2043                         $dbr = wfGetDB( DB_SLAVE );
2044                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2045                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2046                                 __METHOD__
2047                         );
2048                         if( $this->getNamespace() == NS_FILE ) {
2049                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2050                                         array( 'fa_name' => $this->getDBkey() ),
2051                                         __METHOD__
2052                                 );
2053                         }
2054                 }
2055                 return (int)$n;
2056         }
2057
2058         /**
2059          * Is there a version of this page in the deletion archive?
2060          * @return bool
2061          */
2062         public function isDeletedQuick() {
2063                 if( $this->getNamespace() < 0 ) {
2064                         return false;
2065                 }
2066                 $dbr = wfGetDB( DB_SLAVE );
2067                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2068                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2069                         __METHOD__
2070                 );
2071                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
2072                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2073                                 array( 'fa_name' => $this->getDBkey() ),
2074                                 __METHOD__
2075                         );
2076                 }
2077                 return $deleted;
2078         }
2079
2080         /**
2081          * Get the article ID for this Title from the link cache,
2082          * adding it if necessary
2083          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2084          *      for update
2085          * @return \type{\int} the ID
2086          */
2087         public function getArticleID( $flags = 0 ) {
2088                 if( $this->getNamespace() < 0 ) {
2089                         return $this->mArticleID = 0;
2090                 }
2091                 $linkCache = LinkCache::singleton();
2092                 if( $flags & GAID_FOR_UPDATE ) {
2093                         $oldUpdate = $linkCache->forUpdate( true );
2094                         $linkCache->clearLink( $this );
2095                         $this->mArticleID = $linkCache->addLinkObj( $this );
2096                         $linkCache->forUpdate( $oldUpdate );
2097                 } else {
2098                         if( -1 == $this->mArticleID ) {
2099                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2100                         }
2101                 }
2102                 return $this->mArticleID;
2103         }
2104
2105         /**
2106          * Is this an article that is a redirect page?
2107          * Uses link cache, adding it if necessary
2108          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2109          * @return \type{\bool}
2110          */
2111         public function isRedirect( $flags = 0 ) {
2112                 if( !is_null($this->mRedirect) )
2113                         return $this->mRedirect;
2114                 # Calling getArticleID() loads the field from cache as needed
2115                 if( !$this->getArticleID($flags) ) {
2116                         return $this->mRedirect = false;
2117                 }
2118                 $linkCache = LinkCache::singleton();
2119                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2120
2121                 return $this->mRedirect;
2122         }
2123
2124         /**
2125          * What is the length of this page?
2126          * Uses link cache, adding it if necessary
2127          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2128          * @return \type{\bool}
2129          */
2130         public function getLength( $flags = 0 ) {
2131                 if( $this->mLength != -1 )
2132                         return $this->mLength;
2133                 # Calling getArticleID() loads the field from cache as needed
2134                 if( !$this->getArticleID($flags) ) {
2135                         return $this->mLength = 0;
2136                 }
2137                 $linkCache = LinkCache::singleton();
2138                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2139
2140                 return $this->mLength;
2141         }
2142
2143         /**
2144          * What is the page_latest field for this page?
2145          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2146          * @return \type{\int} or false if the page doesn't exist
2147          */
2148         public function getLatestRevID( $flags = 0 ) {
2149                 if( $this->mLatestID !== false )
2150                         return $this->mLatestID;
2151
2152                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2153                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
2154                 return $this->mLatestID;
2155         }
2156
2157         /**
2158          * This clears some fields in this object, and clears any associated
2159          * keys in the "bad links" section of the link cache.
2160          *
2161          * - This is called from Article::insertNewArticle() to allow
2162          * loading of the new page_id. It's also called from
2163          * Article::doDeleteArticle()
2164          *
2165          * @param $newid \type{\int} the new Article ID
2166          */
2167         public function resetArticleID( $newid ) {
2168                 $linkCache = LinkCache::singleton();
2169                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2170
2171                 if ( $newid === false ) { $this->mArticleID = -1; }
2172                 else { $this->mArticleID = intval( $newid ); }
2173                 $this->mRestrictionsLoaded = false;
2174                 $this->mRestrictions = array();
2175         }
2176
2177         /**
2178          * Updates page_touched for this page; called from LinksUpdate.php
2179          * @return \type{\bool} true if the update succeded
2180          */
2181         public function invalidateCache() {
2182                 if( wfReadOnly() ) {
2183                         return;
2184                 }
2185                 $dbw = wfGetDB( DB_MASTER );
2186                 $success = $dbw->update( 'page',
2187                         array( 'page_touched' => $dbw->timestamp() ),
2188                         $this->pageCond(),
2189                         __METHOD__
2190                 );
2191                 HTMLFileCache::clearFileCache( $this );
2192                 return $success;
2193         }
2194
2195         /**
2196          * Prefix some arbitrary text with the namespace or interwiki prefix
2197          * of this object
2198          *
2199          * @param $name \type{\string} the text
2200          * @return \type{\string} the prefixed text
2201          * @private
2202          */
2203         /* private */ function prefix( $name ) {
2204                 $p = '';
2205                 if ( '' != $this->mInterwiki ) {
2206                         $p = $this->mInterwiki . ':';
2207                 }
2208                 if ( 0 != $this->mNamespace ) {
2209                         $p .= $this->getNsText() . ':';
2210                 }
2211                 return $p . $name;
2212         }
2213
2214         // Returns a simple regex that will match on characters and sequences invalid in titles.
2215         //  Note that this doesn't pick up many things that could be wrong with titles, but that
2216         //  replacing this regex with something valid will make many titles valid.
2217         static function getTitleInvalidRegex() {
2218                 static $rxTc = false;
2219                 if( !$rxTc ) {
2220                         # Matching titles will be held as illegal.
2221                         $rxTc = '/' .
2222                                 # Any character not allowed is forbidden...
2223                                 '[^' . Title::legalChars() . ']' .
2224                                 # URL percent encoding sequences interfere with the ability
2225                                 # to round-trip titles -- you can't link to them consistently.
2226                                 '|%[0-9A-Fa-f]{2}' .
2227                                 # XML/HTML character references produce similar issues.
2228                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2229                                 '|&#[0-9]+;' .
2230                                 '|&#x[0-9A-Fa-f]+;' .
2231                                 '/S';
2232                 }
2233
2234                 return $rxTc;
2235         }
2236
2237         /**
2238          * Capitalize a text if it belongs to a namespace that capitalizes
2239          */
2240         public static function capitalize( $text, $ns = NS_MAIN ) {
2241                 global $wgContLang;
2242
2243                 if ( MWNamespace::isCapitalized( $ns ) )
2244                         return $wgContLang->ucfirst( $text );
2245                 else
2246                         return $text;
2247         }
2248
2249         /**
2250          * Secure and split - main initialisation function for this object
2251          *
2252          * Assumes that mDbkeyform has been set, and is urldecoded
2253          * and uses underscores, but not otherwise munged.  This function
2254          * removes illegal characters, splits off the interwiki and
2255          * namespace prefixes, sets the other forms, and canonicalizes
2256          * everything.
2257          * @return \type{\bool} true on success
2258          */
2259         private function secureAndSplit() {
2260                 global $wgContLang, $wgLocalInterwiki;
2261
2262                 # Initialisation
2263                 $rxTc = self::getTitleInvalidRegex();
2264
2265                 $this->mInterwiki = $this->mFragment = '';
2266                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2267
2268                 $dbkey = $this->mDbkeyform;
2269
2270                 # Strip Unicode bidi override characters.
2271                 # Sometimes they slip into cut-n-pasted page titles, where the
2272                 # override chars get included in list displays.
2273                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2274
2275                 # Clean up whitespace
2276                 # Note: use of the /u option on preg_replace here will cause
2277                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2278                 # conveniently disabling them.
2279                 #
2280                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2281                 $dbkey = trim( $dbkey, '_' );
2282
2283                 if ( '' == $dbkey ) {
2284                         return false;
2285                 }
2286
2287                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2288                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2289                         return false;
2290                 }
2291
2292                 $this->mDbkeyform = $dbkey;
2293
2294                 # Initial colon indicates main namespace rather than specified default
2295                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2296                 if ( ':' == $dbkey{0} ) {
2297                         $this->mNamespace = NS_MAIN;
2298                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2299                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2300                 }
2301
2302                 # Namespace or interwiki prefix
2303                 $firstPass = true;
2304                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2305                 do {
2306                         $m = array();
2307                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2308                                 $p = $m[1];
2309                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2310                                         # Ordinary namespace
2311                                         $dbkey = $m[2];
2312                                         $this->mNamespace = $ns;
2313                                         # For Talk:X pages, check if X has a "namespace" prefix
2314                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2315                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2316                                                         return false; # Disallow Talk:File:x type titles...
2317                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2318                                                         return false; # Disallow Talk:Interwiki:x type titles...
2319                                         }
2320                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2321                                         if( !$firstPass ) {
2322                                                 # Can't make a local interwiki link to an interwiki link.
2323                                                 # That's just crazy!
2324                                                 return false;
2325                                         }
2326
2327                                         # Interwiki link
2328                                         $dbkey = $m[2];
2329                                         $this->mInterwiki = $wgContLang->lc( $p );
2330
2331                                         # Redundant interwiki prefix to the local wiki
2332                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2333                                                 if( $dbkey == '' ) {
2334                                                         # Can't have an empty self-link
2335                                                         return false;
2336                                                 }
2337                                                 $this->mInterwiki = '';
2338                                                 $firstPass = false;
2339                                                 # Do another namespace split...
2340                                                 continue;
2341                                         }
2342
2343                                         # If there's an initial colon after the interwiki, that also
2344                                         # resets the default namespace
2345                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2346                                                 $this->mNamespace = NS_MAIN;
2347                                                 $dbkey = substr( $dbkey, 1 );
2348                                         }
2349                                 }
2350                                 # If there's no recognized interwiki or namespace,
2351                                 # then let the colon expression be part of the title.
2352                         }
2353                         break;
2354                 } while( true );
2355
2356                 # We already know that some pages won't be in the database!
2357                 #
2358                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2359                         $this->mArticleID = 0;
2360                 }
2361                 $fragment = strstr( $dbkey, '#' );
2362                 if ( false !== $fragment ) {
2363                         $this->setFragment( $fragment );
2364                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2365                         # remove whitespace again: prevents "Foo_bar_#"
2366                         # becoming "Foo_bar_"
2367                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2368                 }
2369
2370                 # Reject illegal characters.
2371                 #
2372                 if( preg_match( $rxTc, $dbkey ) ) {
2373                         return false;
2374                 }
2375
2376                 /**
2377                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2378                  * reachable due to the way web browsers deal with 'relative' URLs.
2379                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2380                  */
2381                 if ( strpos( $dbkey, '.' ) !== false &&
2382                      ( $dbkey === '.' || $dbkey === '..' ||
2383                        strpos( $dbkey, './' ) === 0  ||
2384                        strpos( $dbkey, '../' ) === 0 ||
2385                        strpos( $dbkey, '/./' ) !== false ||
2386                        strpos( $dbkey, '/../' ) !== false  ||
2387                        substr( $dbkey, -2 ) == '/.' ||
2388                        substr( $dbkey, -3 ) == '/..' ) )
2389                 {
2390                         return false;
2391                 }
2392
2393                 /**
2394                  * Magic tilde sequences? Nu-uh!
2395                  */
2396                 if( strpos( $dbkey, '~~~' ) !== false ) {
2397                         return false;
2398                 }
2399
2400                 /**
2401                  * Limit the size of titles to 255 bytes.
2402                  * This is typically the size of the underlying database field.
2403                  * We make an exception for special pages, which don't need to be stored
2404                  * in the database, and may edge over 255 bytes due to subpage syntax
2405                  * for long titles, e.g. [[Special:Block/Long name]]
2406                  */
2407                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2408                   strlen( $dbkey ) > 512 )
2409                 {
2410                         return false;
2411                 }
2412
2413                 /**
2414                  * Normally, all wiki links are forced to have
2415                  * an initial capital letter so [[foo]] and [[Foo]]
2416                  * point to the same place.
2417                  *
2418                  * Don't force it for interwikis, since the other
2419                  * site might be case-sensitive.
2420                  */
2421                 $this->mUserCaseDBKey = $dbkey;
2422                 if(  $this->mInterwiki == '') {
2423                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
2424                 }
2425
2426                 /**
2427                  * Can't make a link to a namespace alone...
2428                  * "empty" local links can only be self-links
2429                  * with a fragment identifier.
2430                  */
2431                 if( $dbkey == '' &&
2432                         $this->mInterwiki == '' &&
2433                         $this->mNamespace != NS_MAIN ) {
2434                         return false;
2435                 }
2436                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2437                 // IP names are not allowed for accounts, and can only be referring to
2438                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2439                 // there are numerous ways to present the same IP. Having sp:contribs scan
2440                 // them all is silly and having some show the edits and others not is
2441                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2442                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2443                         IP::sanitizeIP( $dbkey ) : $dbkey;
2444                 // Any remaining initial :s are illegal.
2445                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2446                         return false;
2447                 }
2448
2449                 # Fill fields
2450                 $this->mDbkeyform = $dbkey;
2451                 $this->mUrlform = wfUrlencode( $dbkey );
2452
2453                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2454
2455                 return true;
2456         }
2457
2458         /**
2459          * Set the fragment for this title. Removes the first character from the
2460          * specified fragment before setting, so it assumes you're passing it with
2461          * an initial "#".
2462          *
2463          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2464          * Still in active use privately.
2465          *
2466          * @param $fragment \type{\string} text
2467          */
2468         public function setFragment( $fragment ) {
2469                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2470         }
2471
2472         /**
2473          * Get a Title object associated with the talk page of this article
2474          * @return \type{Title} the object for the talk page
2475          */
2476         public function getTalkPage() {
2477                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2478         }
2479
2480         /**
2481          * Get a title object associated with the subject page of this
2482          * talk page
2483          *
2484          * @return \type{Title} the object for the subject page
2485          */
2486         public function getSubjectPage() {
2487                 // Is this the same title?
2488                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2489                 if( $this->getNamespace() == $subjectNS ) {
2490                         return $this;
2491                 }
2492                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2493         }
2494
2495         /**
2496          * Get an array of Title objects linking to this Title
2497          * Also stores the IDs in the link cache.
2498          *
2499          * WARNING: do not use this function on arbitrary user-supplied titles!
2500          * On heavily-used templates it will max out the memory.
2501          *
2502          * @param array $options may be FOR UPDATE
2503          * @return \type{\arrayof{Title}} the Title objects linking here
2504          */
2505         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2506                 $linkCache = LinkCache::singleton();
2507
2508                 if ( count( $options ) > 0 ) {
2509                         $db = wfGetDB( DB_MASTER );
2510                 } else {
2511                         $db = wfGetDB( DB_SLAVE );
2512                 }
2513
2514                 $res = $db->select( array( 'page', $table ),
2515                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2516                         array(
2517                                 "{$prefix}_from=page_id",
2518                                 "{$prefix}_namespace" => $this->getNamespace(),
2519                                 "{$prefix}_title"     => $this->getDBkey() ),
2520                         __METHOD__,
2521                         $options );
2522
2523                 $retVal = array();
2524                 if ( $db->numRows( $res ) ) {
2525                         foreach( $res as $row ) {
2526                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2527                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2528                                         $retVal[] = $titleObj;
2529                                 }
2530                         }
2531                 }
2532                 $db->freeResult( $res );
2533                 return $retVal;
2534         }
2535
2536         /**
2537          * Get an array of Title objects using this Title as a template
2538          * Also stores the IDs in the link cache.
2539          *
2540          * WARNING: do not use this function on arbitrary user-supplied titles!
2541          * On heavily-used templates it will max out the memory.
2542          *
2543          * @param array $options may be FOR UPDATE
2544          * @return \type{\arrayof{Title}} the Title objects linking here
2545          */
2546         public function getTemplateLinksTo( $options = array() ) {
2547                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2548         }
2549
2550         /**
2551          * Get an array of Title objects referring to non-existent articles linked from this page
2552          *
2553          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2554          * @return \type{\arrayof{Title}} the Title objects
2555          */
2556         public function getBrokenLinksFrom() {
2557                 if ( $this->getArticleId() == 0 ) {
2558                         # All links from article ID 0 are false positives
2559                         return array();
2560                 }
2561
2562                 $dbr = wfGetDB( DB_SLAVE );
2563                 $res = $dbr->select(
2564                         array( 'page', 'pagelinks' ),
2565                         array( 'pl_namespace', 'pl_title' ),
2566                         array(
2567                                 'pl_from' => $this->getArticleId(),
2568                                 'page_namespace IS NULL'
2569                         ),
2570                         __METHOD__, array(),
2571                         array(
2572                                 'page' => array(
2573                                         'LEFT JOIN',
2574                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2575                                 )
2576                         )
2577                 );
2578
2579                 $retVal = array();
2580                 foreach( $res as $row ) {
2581                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2582                 }
2583                 return $retVal;
2584         }
2585
2586
2587         /**
2588          * Get a list of URLs to purge from the Squid cache when this
2589          * page changes
2590          *
2591          * @return \type{\arrayof{\string}} the URLs
2592          */
2593         public function getSquidURLs() {
2594                 global $wgContLang;
2595
2596                 $urls = array(
2597                         $this->getInternalURL(),
2598                         $this->getInternalURL( 'action=history' )
2599                 );
2600
2601                 // purge variant urls as well
2602                 if($wgContLang->hasVariants()){
2603                         $variants = $wgContLang->getVariants();
2604                         foreach($variants as $vCode){
2605                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2606                                 $urls[] = $this->getInternalURL('',$vCode);
2607                         }
2608                 }
2609
2610                 return $urls;
2611         }
2612
2613         /**
2614          * Purge all applicable Squid URLs
2615          */
2616         public function purgeSquid() {
2617                 global $wgUseSquid;
2618                 if ( $wgUseSquid ) {
2619                         $urls = $this->getSquidURLs();
2620                         $u = new SquidUpdate( $urls );
2621                         $u->doUpdate();
2622                 }
2623         }
2624
2625         /**
2626          * Move this page without authentication
2627          * @param &$nt \type{Title} the new page Title
2628          */
2629         public function moveNoAuth( &$nt ) {
2630                 return $this->moveTo( $nt, false );
2631         }
2632
2633         /**
2634          * Check whether a given move operation would be valid.
2635          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2636          * @param &$nt \type{Title} the new title
2637          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2638          *      should be checked
2639          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2640          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2641          */
2642         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2643                 global $wgUser;
2644
2645                 $errors = array();
2646                 if( !$nt ) {
2647                         // Normally we'd add this to $errors, but we'll get
2648                         // lots of syntax errors if $nt is not an object
2649                         return array(array('badtitletext'));
2650                 }
2651                 if( $this->equals( $nt ) ) {
2652                         $errors[] = array('selfmove');
2653                 }
2654                 if( !$this->isMovable() ) {
2655                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2656                 }
2657                 if ( $nt->getInterwiki() != '' ) {
2658                         $errors[] = array( 'immobile-target-namespace-iw' );
2659                 }
2660                 if ( !$nt->isMovable() ) {
2661                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2662                 }
2663
2664                 $oldid = $this->getArticleID();
2665                 $newid = $nt->getArticleID();
2666
2667                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2668                         $errors[] = array('articleexists');
2669                 }
2670                 if ( ( '' == $this->getDBkey() ) ||
2671                          ( !$oldid ) ||
2672                      ( '' == $nt->getDBkey() ) ) {
2673                         $errors[] = array('badarticleerror');
2674                 }
2675
2676                 // Image-specific checks
2677                 if( $this->getNamespace() == NS_FILE ) {
2678                         $file = wfLocalFile( $this );
2679                         if( $file->exists() ) {
2680                                 if( $nt->getNamespace() != NS_FILE ) {
2681                                         $errors[] = array('imagenocrossnamespace');
2682                                 }
2683                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2684                                         $errors[] = array('imageinvalidfilename');
2685                                 }
2686                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2687                                         $errors[] = array('imagetypemismatch');
2688                                 }
2689                         }
2690                 }
2691
2692                 if ( $auth ) {
2693                         $errors = wfMergeErrorArrays( $errors,
2694                                 $this->getUserPermissionsErrors('move', $wgUser),
2695                                 $this->getUserPermissionsErrors('edit', $wgUser),
2696                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2697                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2698                 }
2699
2700                 $match = EditPage::matchSummarySpamRegex( $reason );
2701                 if( $match !== false ) {
2702                         // This is kind of lame, won't display nice
2703                         $errors[] = array('spamprotectiontext');
2704                 }
2705
2706                 $err = null;
2707                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2708                         $errors[] = array('hookaborted', $err);
2709                 }
2710
2711                 # The move is allowed only if (1) the target doesn't exist, or
2712                 # (2) the target is a redirect to the source, and has no history
2713                 # (so we can undo bad moves right after they're done).
2714
2715                 if ( 0 != $newid ) { # Target exists; check for validity
2716                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2717                                 $errors[] = array('articleexists');
2718                         }
2719                 } else {
2720                         $tp = $nt->getTitleProtection();
2721                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2722                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2723                                 $errors[] = array('cantmove-titleprotected');
2724                         }
2725                 }
2726                 if(empty($errors))
2727                         return true;
2728                 return $errors;
2729         }
2730
2731         /**
2732          * Move a title to a new location
2733          * @param &$nt \type{Title} the new title
2734          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2735          *      should be checked
2736          * @param $reason \type{\string} The reason for the move
2737          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2738          *  Ignored if the user doesn't have the suppressredirect right.
2739          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2740          */
2741         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2742                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2743                 if( is_array( $err ) ) {
2744                         return $err;
2745                 }
2746
2747                 // If it is a file, more it first. It is done before all other moving stuff is done because it's hard to revert
2748                 $dbw = wfGetDB( DB_MASTER );
2749                 if( $this->getNamespace() == NS_FILE ) {
2750                         $file = wfLocalFile( $this );
2751                         if( $file->exists() ) {
2752                                 $status = $file->move( $nt );
2753                                 if( !$status->isOk() ) {
2754                                         return $status->getErrorsArray();
2755                                 }
2756                         }
2757                 }
2758
2759                 $pageid = $this->getArticleID();
2760                 $protected = $this->isProtected();
2761                 if( $nt->exists() ) {
2762                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2763                         $pageCountChange = ($createRedirect ? 0 : -1);
2764                 } else { # Target didn't exist, do normal move.
2765                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2766                         $pageCountChange = ($createRedirect ? 1 : 0);
2767                 }
2768
2769                 if( is_array( $err ) ) {
2770                         return $err;
2771                 }
2772                 $redirid = $this->getArticleID();
2773
2774                 // Category memberships include a sort key which may be customized.
2775                 // If it's left as the default (the page title), we need to update
2776                 // the sort key to match the new title.
2777                 //
2778                 // Be careful to avoid resetting cl_timestamp, which may disturb
2779                 // time-based lists on some sites.
2780                 //
2781                 // Warning -- if the sort key is *explicitly* set to the old title,
2782                 // we can't actually distinguish it from a default here, and it'll
2783                 // be set to the new title even though it really shouldn't.
2784                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2785                 $dbw->update( 'categorylinks',
2786                         array(
2787                                 'cl_sortkey' => $nt->getPrefixedText(),
2788                                 'cl_timestamp=cl_timestamp' ),
2789                         array(
2790                                 'cl_from' => $pageid,
2791                                 'cl_sortkey' => $this->getPrefixedText() ),
2792                         __METHOD__ );
2793
2794                 if( $protected ) {
2795                         # Protect the redirect title as the title used to be...
2796                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2797                                 array(
2798                                         'pr_page'    => $redirid,
2799                                         'pr_type'    => 'pr_type',
2800                                         'pr_level'   => 'pr_level',
2801                                         'pr_cascade' => 'pr_cascade',
2802                                         'pr_user'    => 'pr_user',
2803                                         'pr_expiry'  => 'pr_expiry'
2804                                 ),
2805                                 array( 'pr_page' => $pageid ),
2806                                 __METHOD__,
2807                                 array( 'IGNORE' )
2808                         );
2809                         # Update the protection log
2810                         $log = new LogPage( 'protect' );
2811                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2812                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2813                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2814                 }
2815
2816                 # Update watchlists
2817                 $oldnamespace = $this->getNamespace() & ~1;
2818                 $newnamespace = $nt->getNamespace() & ~1;
2819                 $oldtitle = $this->getDBkey();
2820                 $newtitle = $nt->getDBkey();
2821
2822                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2823                         WatchedItem::duplicateEntries( $this, $nt );
2824                 }
2825
2826                 # Update search engine
2827                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2828                 $u->doUpdate();
2829                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2830                 $u->doUpdate();
2831
2832                 # Update site_stats
2833                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2834                         # No longer a content page
2835                         # Not viewed, edited, removing
2836                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2837                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2838                         # Now a content page
2839                         # Not viewed, edited, adding
2840                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2841                 } elseif( $pageCountChange ) {
2842                         # Redirect added
2843                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2844                 } else {
2845                         # Nothing special
2846                         $u = false;
2847                 }
2848                 if( $u )
2849                         $u->doUpdate();
2850                 # Update message cache for interface messages
2851                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2852                         global $wgMessageCache;
2853
2854                         # @bug 17860: old article can be deleted, if this the case,
2855                         # delete it from message cache
2856                         if ( $this->getArticleID() === 0 ) {
2857                                 $wgMessageCache->replace( $this->getDBkey(), false );
2858                         } else {
2859                                 $oldarticle = new Article( $this );
2860                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2861                         }
2862
2863                         $newarticle = new Article( $nt );
2864                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2865                 }
2866
2867                 global $wgUser;
2868                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2869                 return true;
2870         }
2871
2872         /**
2873          * Move page to a title which is at present a redirect to the
2874          * source page
2875          *
2876          * @param &$nt \type{Title} the page to move to, which should currently
2877          *      be a redirect
2878          * @param $reason \type{\string} The reason for the move
2879          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2880          *  Ignored if the user doesn't have the suppressredirect right
2881          */
2882         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2883                 global $wgUseSquid, $wgUser;
2884
2885                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2886
2887                 if ( $reason ) {
2888                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2889                 }
2890
2891                 $now = wfTimestampNow();
2892                 $newid = $nt->getArticleID();
2893                 $oldid = $this->getArticleID();
2894                 $latest = $this->getLatestRevID();
2895
2896                 $dbw = wfGetDB( DB_MASTER );
2897
2898                 $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
2899                 $newns = $nt->getNamespace();
2900                 $newdbk = $nt->getDBkey();
2901
2902                 # Delete the old redirect. We don't save it to history since
2903                 # by definition if we've got here it's rather uninteresting.
2904                 # We have to remove it so that the next step doesn't trigger
2905                 # a conflict on the unique namespace+title index...
2906                 $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
2907                 if ( !$dbw->cascadingDeletes() ) {
2908                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2909                         global $wgUseTrackbacks;
2910                         if ($wgUseTrackbacks)
2911                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2912                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2913                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2914                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2915                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2916                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2917                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2918                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2919                 }
2920                 // If the redirect was recently created, it may have an entry in recentchanges still
2921                 $dbw->delete( 'recentchanges',
2922                         array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
2923                         __METHOD__
2924                 );
2925
2926                 # Save a null revision in the page's history notifying of the move
2927                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2928                 $nullRevId = $nullRevision->insertOn( $dbw );
2929
2930                 $article = new Article( $this );
2931                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2932
2933                 # Change the name of the target page:
2934                 $dbw->update( 'page',
2935                         /* SET */ array(
2936                                 'page_touched'   => $dbw->timestamp($now),
2937                                 'page_namespace' => $nt->getNamespace(),
2938                                 'page_title'     => $nt->getDBkey(),
2939                                 'page_latest'    => $nullRevId,
2940                         ),
2941                         /* WHERE */ array( 'page_id' => $oldid ),
2942                         __METHOD__
2943                 );
2944                 $nt->resetArticleID( $oldid );
2945
2946                 # Recreate the redirect, this time in the other direction.
2947                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2948                         $mwRedir = MagicWord::get( 'redirect' );
2949                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2950                         $redirectArticle = new Article( $this );
2951                         $newid = $redirectArticle->insertOn( $dbw );
2952                         $redirectRevision = new Revision( array(
2953                                 'page'    => $newid,
2954                                 'comment' => $comment,
2955                                 'text'    => $redirectText ) );
2956                         $redirectRevision->insertOn( $dbw );
2957                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2958
2959                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2960
2961                         # Now, we record the link from the redirect to the new title.
2962                         # It should have no other outgoing links...
2963                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2964                         $dbw->insert( 'pagelinks',
2965                                 array(
2966                                         'pl_from'      => $newid,
2967                                         'pl_namespace' => $nt->getNamespace(),
2968                                         'pl_title'     => $nt->getDBkey() ),
2969                                 __METHOD__ );
2970                         $redirectSuppressed = false;
2971                 } else {
2972                         $this->resetArticleID( 0 );
2973                         $redirectSuppressed = true;
2974                 }
2975
2976                 # Log the move
2977                 $log = new LogPage( 'move' );
2978                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2979
2980                 # Purge squid
2981                 if ( $wgUseSquid ) {
2982                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2983                         $u = new SquidUpdate( $urls );
2984                         $u->doUpdate();
2985                 }
2986
2987         }
2988
2989         /**
2990          * Move page to non-existing title.
2991          * @param &$nt \type{Title} the new Title
2992          * @param $reason \type{\string} The reason for the move
2993          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2994          *  Ignored if the user doesn't have the suppressredirect right
2995          */
2996         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2997                 global $wgUseSquid, $wgUser;
2998
2999                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3000                 if ( $reason ) {
3001                         $comment .= wfMsgExt( 'colon-separator',
3002                                 array( 'escapenoentities', 'content' ) );
3003                         $comment .= $reason;
3004                 }
3005
3006                 $newid = $nt->getArticleID();
3007                 $oldid = $this->getArticleID();
3008                 $latest = $this->getLatestRevId();
3009
3010                 $dbw = wfGetDB( DB_MASTER );
3011                 $now = $dbw->timestamp();
3012
3013                 # Save a null revision in the page's history notifying of the move
3014                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3015                 if ( !is_object( $nullRevision ) ) {
3016                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3017                 }
3018                 $nullRevId = $nullRevision->insertOn( $dbw );
3019
3020                 $article = new Article( $this );
3021                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
3022
3023                 # Rename page entry
3024                 $dbw->update( 'page',
3025                         /* SET */ array(
3026                                 'page_touched'   => $now,
3027                                 'page_namespace' => $nt->getNamespace(),
3028                                 'page_title'     => $nt->getDBkey(),
3029                                 'page_latest'    => $nullRevId,
3030                         ),
3031                         /* WHERE */ array( 'page_id' => $oldid ),
3032                         __METHOD__
3033                 );
3034                 $nt->resetArticleID( $oldid );
3035
3036                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3037                         # Insert redirect
3038                         $mwRedir = MagicWord::get( 'redirect' );
3039                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3040                         $redirectArticle = new Article( $this );
3041                         $newid = $redirectArticle->insertOn( $dbw );
3042                         $redirectRevision = new Revision( array(
3043                                 'page'    => $newid,
3044                                 'comment' => $comment,
3045                                 'text'    => $redirectText ) );
3046                         $redirectRevision->insertOn( $dbw );
3047                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3048
3049                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3050
3051                         # Record the just-created redirect's linking to the page
3052                         $dbw->insert( 'pagelinks',
3053                                 array(
3054                                         'pl_from'      => $newid,
3055                                         'pl_namespace' => $nt->getNamespace(),
3056                                         'pl_title'     => $nt->getDBkey() ),
3057                                 __METHOD__ );
3058                         $redirectSuppressed = false;
3059                 } else {
3060                         $this->resetArticleID( 0 );
3061                         $redirectSuppressed = true;
3062                 }
3063
3064                 # Log the move
3065                 $log = new LogPage( 'move' );
3066                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3067
3068                 # Purge caches as per article creation
3069                 Article::onArticleCreate( $nt );
3070
3071                 # Purge old title from squid
3072                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
3073                 $this->purgeSquid();
3074
3075         }
3076
3077         /**
3078          * Move this page's subpages to be subpages of $nt
3079          * @param $nt Title Move target
3080          * @param $auth bool Whether $wgUser's permissions should be checked
3081          * @param $reason string The reason for the move
3082          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
3083          *  Ignored if the user doesn't have the 'suppressredirect' right
3084          * @return mixed array with old page titles as keys, and strings (new page titles) or
3085          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
3086          */
3087         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3088                 global $wgMaximumMovedPages;
3089                 // Check permissions
3090                 if( !$this->userCan( 'move-subpages' ) )
3091                         return array( 'cant-move-subpages' );
3092                 // Do the source and target namespaces support subpages?
3093                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
3094                         return array( 'namespace-nosubpages',
3095                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3096                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
3097                         return array( 'namespace-nosubpages',
3098                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3099
3100                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
3101                 $retval = array();
3102                 $count = 0;
3103                 foreach( $subpages as $oldSubpage ) {
3104                         $count++;
3105                         if( $count > $wgMaximumMovedPages ) {
3106                                 $retval[$oldSubpage->getPrefixedTitle()] =
3107                                                 array( 'movepage-max-pages',
3108                                                         $wgMaximumMovedPages );
3109                                 break;
3110                         }
3111
3112                         // We don't know whether this function was called before
3113                         // or after moving the root page, so check both
3114                         // $this and $nt
3115                         if( $oldSubpage->getArticleId() == $this->getArticleId() ||
3116                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3117                                 // When moving a page to a subpage of itself,
3118                                 // don't move it twice
3119                                 continue;
3120                         $newPageName = preg_replace(
3121                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
3122                                         str_replace( '\\', '\\\\', $nt->getDBkey() ), # bug 21234
3123                                         $oldSubpage->getDBkey() );
3124                         if( $oldSubpage->isTalkPage() ) {
3125                                 $newNs = $nt->getTalkPage()->getNamespace();
3126                         } else {
3127                                 $newNs = $nt->getSubjectPage()->getNamespace();
3128                         }
3129                         # Bug 14385: we need makeTitleSafe because the new page names may
3130                         # be longer than 255 characters.
3131                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3132
3133                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3134                         if( $success === true ) {
3135                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3136                         } else {
3137                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3138                         }
3139                 }
3140                 return $retval;
3141         }
3142
3143         /**
3144          * Checks if this page is just a one-rev redirect.
3145          * Adds lock, so don't use just for light purposes.
3146          *
3147          * @return \type{\bool} TRUE or FALSE
3148          */
3149         public function isSingleRevRedirect() {
3150                 $dbw = wfGetDB( DB_MASTER );
3151                 # Is it a redirect?
3152                 $row = $dbw->selectRow( 'page',
3153                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3154                         $this->pageCond(),
3155                         __METHOD__,
3156                         array( 'FOR UPDATE' )
3157                 );
3158                 # Cache some fields we may want
3159                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3160                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3161                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3162                 if( !$this->mRedirect ) {
3163                         return false;
3164                 }
3165                 # Does the article have a history?
3166                 $row = $dbw->selectField( array( 'page', 'revision'),
3167                         'rev_id',
3168                         array( 'page_namespace' => $this->getNamespace(),
3169                                 'page_title' => $this->getDBkey(),
3170                                 'page_id=rev_page',
3171                                 'page_latest != rev_id'
3172                         ),
3173                         __METHOD__,
3174                         array( 'FOR UPDATE' )
3175                 );
3176                 # Return true if there was no history
3177                 return ($row === false);
3178         }
3179
3180         /**
3181          * Checks if $this can be moved to a given Title
3182          * - Selects for update, so don't call it unless you mean business
3183          *
3184          * @param &$nt \type{Title} the new title to check
3185          * @return \type{\bool} TRUE or FALSE
3186          */
3187         public function isValidMoveTarget( $nt ) {
3188                 $dbw = wfGetDB( DB_MASTER );
3189                 # Is it an existsing file?
3190                 if( $nt->getNamespace() == NS_FILE ) {
3191                         $file = wfLocalFile( $nt );
3192                         if( $file->exists() ) {
3193                                 wfDebug( __METHOD__ . ": file exists\n" );
3194                                 return false;
3195                         }
3196                 }
3197                 # Is it a redirect with no history?
3198                 if( !$nt->isSingleRevRedirect() ) {
3199                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3200                         return false;
3201                 }
3202                 # Get the article text
3203                 $rev = Revision::newFromTitle( $nt );
3204                 $text = $rev->getText();
3205                 # Does the redirect point to the source?
3206                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3207                 $m = array();
3208                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3209                         $redirTitle = Title::newFromText( $m[1] );
3210                         if( !is_object( $redirTitle ) ||
3211                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3212                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3213                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3214                                 return false;
3215                         }
3216                 } else {
3217                         # Fail safe
3218                         wfDebug( __METHOD__ . ": failsafe\n" );
3219                         return false;
3220                 }
3221                 return true;
3222         }
3223
3224         /**
3225          * Can this title be added to a user's watchlist?
3226          *
3227          * @return \type{\bool} TRUE or FALSE
3228          */
3229         public function isWatchable() {
3230                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3231         }
3232
3233         /**
3234          * Get categories to which this Title belongs and return an array of
3235          * categories' names.
3236          *
3237          * @return \type{\array} array an array of parents in the form:
3238          *      $parent => $currentarticle
3239          */
3240         public function getParentCategories() {
3241                 global $wgContLang;
3242
3243                 $titlekey = $this->getArticleId();
3244                 $dbr = wfGetDB( DB_SLAVE );
3245                 $categorylinks = $dbr->tableName( 'categorylinks' );
3246
3247                 # NEW SQL
3248                 $sql = "SELECT * FROM $categorylinks"
3249                      ." WHERE cl_from='$titlekey'"
3250                          ." AND cl_from <> '0'"
3251                          ." ORDER BY cl_sortkey";
3252
3253                 $res = $dbr->query( $sql );
3254
3255                 if( $dbr->numRows( $res ) > 0 ) {
3256                         foreach( $res as $row )
3257                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3258                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3259                         $dbr->freeResult( $res );
3260                 } else {
3261                         $data = array();
3262                 }
3263                 return $data;
3264         }
3265
3266         /**
3267          * Get a tree of parent categories
3268          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3269          * @return \type{\array} Tree of parent categories
3270          */
3271         public function getParentCategoryTree( $children = array() ) {
3272                 $stack = array();
3273                 $parents = $this->getParentCategories();
3274
3275                 if( $parents ) {
3276                         foreach( $parents as $parent => $current ) {
3277                                 if ( array_key_exists( $parent, $children ) ) {
3278                                         # Circular reference
3279                                         $stack[$parent] = array();
3280                                 } else {
3281                                         $nt = Title::newFromText($parent);
3282                                         if ( $nt ) {
3283                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3284                                         }
3285                                 }
3286                         }
3287                         return $stack;
3288                 } else {
3289                         return array();
3290                 }
3291         }
3292
3293
3294         /**
3295          * Get an associative array for selecting this title from
3296          * the "page" table
3297          *
3298          * @return \type{\array} Selection array
3299          */
3300         public function pageCond() {
3301                 if( $this->mArticleID > 0 ) {
3302                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3303                         return array( 'page_id' => $this->mArticleID );
3304                 } else {
3305                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3306                 }
3307         }
3308
3309         /**
3310          * Get the revision ID of the previous revision
3311          *
3312          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3313          * @param $flags \type{\int} GAID_FOR_UPDATE
3314          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3315          */
3316         public function getPreviousRevisionID( $revId, $flags=0 ) {
3317                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3318                 return $db->selectField( 'revision', 'rev_id',
3319                         array(
3320                                 'rev_page' => $this->getArticleId($flags),
3321                                 'rev_id < ' . intval( $revId )
3322                         ),
3323                         __METHOD__,
3324                         array( 'ORDER BY' => 'rev_id DESC' )
3325                 );
3326         }
3327
3328         /**
3329          * Get the revision ID of the next revision
3330          *
3331          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3332          * @param $flags \type{\int} GAID_FOR_UPDATE
3333          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3334          */
3335         public function getNextRevisionID( $revId, $flags=0 ) {
3336                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3337                 return $db->selectField( 'revision', 'rev_id',
3338                         array(
3339                                 'rev_page' => $this->getArticleId($flags),
3340                                 'rev_id > ' . intval( $revId )
3341                         ),
3342                         __METHOD__,
3343                         array( 'ORDER BY' => 'rev_id' )
3344                 );
3345         }
3346
3347         /**
3348          * Get the first revision of the page
3349          *
3350          * @param $flags \type{\int} GAID_FOR_UPDATE
3351          * @return Revision (or NULL if page doesn't exist)
3352          */
3353         public function getFirstRevision( $flags=0 ) {
3354                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3355                 $pageId = $this->getArticleId($flags);
3356                 if( !$pageId ) return null;
3357                 $row = $db->selectRow( 'revision', '*',
3358                         array( 'rev_page' => $pageId ),
3359                         __METHOD__,
3360                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3361                 );
3362                 if( !$row ) {
3363                         return null;
3364                 } else {
3365                         return new Revision( $row );
3366                 }
3367         }
3368
3369         /**
3370          * Check if this is a new page
3371          *
3372          * @return bool
3373          */
3374         public function isNewPage() {
3375                 $dbr = wfGetDB( DB_SLAVE );
3376                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3377         }
3378
3379         /**
3380          * Get the oldest revision timestamp of this page
3381          *
3382          * @return string, MW timestamp
3383          */
3384         public function getEarliestRevTime() {
3385                 $dbr = wfGetDB( DB_SLAVE );
3386                 if( $this->exists() ) {
3387                         $min = $dbr->selectField( 'revision',
3388                                 'MIN(rev_timestamp)',
3389                                 array( 'rev_page' => $this->getArticleId() ),
3390                                 __METHOD__ );
3391                         return wfTimestampOrNull( TS_MW, $min );
3392                 }
3393                 return null;
3394         }
3395
3396         /**
3397          * Get the number of revisions between the given revision IDs.
3398          * Used for diffs and other things that really need it.
3399          *
3400          * @param $old \type{\int} Revision ID.
3401          * @param $new \type{\int} Revision ID.
3402          * @return \type{\int} Number of revisions between these IDs.
3403          */
3404         public function countRevisionsBetween( $old, $new ) {
3405                 $dbr = wfGetDB( DB_SLAVE );
3406                 return (int)$dbr->selectField( 'revision', 'count(*)',
3407                         'rev_page = ' . intval( $this->getArticleId() ) .
3408                         ' AND rev_id > ' . intval( $old ) .
3409                         ' AND rev_id < ' . intval( $new ),
3410                         __METHOD__
3411                 );
3412         }
3413
3414         /**
3415          * Compare with another title.
3416          *
3417          * @param \type{Title} $title
3418          * @return \type{\bool} TRUE or FALSE
3419          */
3420         public function equals( Title $title ) {
3421                 // Note: === is necessary for proper matching of number-like titles.
3422                 return $this->getInterwiki() === $title->getInterwiki()
3423                         && $this->getNamespace() == $title->getNamespace()
3424                         && $this->getDBkey() === $title->getDBkey();
3425         }
3426
3427         /**
3428          * Callback for usort() to do title sorts by (namespace, title)
3429          */
3430         public static function compare( $a, $b ) {
3431                 if( $a->getNamespace() == $b->getNamespace() ) {
3432                         return strcmp( $a->getText(), $b->getText() );
3433                 } else {
3434                         return $a->getNamespace() - $b->getNamespace();
3435                 }
3436         }
3437
3438         /**
3439          * Return a string representation of this title
3440          *
3441          * @return \type{\string} String representation of this title
3442          */
3443         public function __toString() {
3444                 return $this->getPrefixedText();
3445         }
3446
3447         /**
3448          * Check if page exists.  For historical reasons, this function simply
3449          * checks for the existence of the title in the page table, and will
3450          * thus return false for interwiki links, special pages and the like.
3451          * If you want to know if a title can be meaningfully viewed, you should
3452          * probably call the isKnown() method instead.
3453          *
3454          * @return \type{\bool} TRUE or FALSE
3455          */
3456         public function exists() {
3457                 return $this->getArticleId() != 0;
3458         }
3459
3460         /**
3461          * Should links to this title be shown as potentially viewable (i.e. as
3462          * "bluelinks"), even if there's no record by this title in the page
3463          * table?
3464          *
3465          * This function is semi-deprecated for public use, as well as somewhat
3466          * misleadingly named.  You probably just want to call isKnown(), which
3467          * calls this function internally.
3468          *
3469          * (ISSUE: Most of these checks are cheap, but the file existence check
3470          * can potentially be quite expensive.  Including it here fixes a lot of
3471          * existing code, but we might want to add an optional parameter to skip
3472          * it and any other expensive checks.)
3473          *
3474          * @return \type{\bool} TRUE or FALSE
3475          */
3476         public function isAlwaysKnown() {
3477                 if( $this->mInterwiki != '' ) {
3478                         return true;  // any interwiki link might be viewable, for all we know
3479                 }
3480                 switch( $this->mNamespace ) {
3481                 case NS_MEDIA:
3482                 case NS_FILE:
3483                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3484                 case NS_SPECIAL:
3485                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3486                 case NS_MAIN:
3487                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3488                 case NS_MEDIAWIKI:
3489                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3490                         // the full l10n of that language to be loaded. That takes much memory and
3491                         // isn't needed. So we strip the language part away.
3492                         // Also, extension messages which are not loaded, are shown as red, because
3493                         // we don't call MessageCache::loadAllMessages.
3494                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3495                         return wfMsgWeirdKey( $basename );  // known system message
3496                 default:
3497                         return false;
3498                 }
3499         }
3500
3501         /**
3502          * Does this title refer to a page that can (or might) be meaningfully
3503          * viewed?  In particular, this function may be used to determine if
3504          * links to the title should be rendered as "bluelinks" (as opposed to
3505          * "redlinks" to non-existent pages).
3506          *
3507          * @return \type{\bool} TRUE or FALSE
3508          */
3509         public function isKnown() {
3510                 return $this->exists() || $this->isAlwaysKnown();
3511         }
3512
3513         /**
3514         * Is this in a namespace that allows actual pages?
3515         *
3516         * @return \type{\bool} TRUE or FALSE
3517         */
3518         public function canExist() {
3519                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3520         }
3521
3522         /**
3523          * Update page_touched timestamps and send squid purge messages for
3524          * pages linking to this title. May be sent to the job queue depending
3525          * on the number of links. Typically called on create and delete.
3526          */
3527         public function touchLinks() {
3528                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3529                 $u->doUpdate();
3530
3531                 if ( $this->getNamespace() == NS_CATEGORY ) {
3532                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3533                         $u->doUpdate();
3534                 }
3535         }
3536
3537         /**
3538          * Get the last touched timestamp
3539          * @param Database $db, optional db
3540          * @return \type{\string} Last touched timestamp
3541          */
3542         public function getTouched( $db = null ) {
3543                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3544                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3545                 return $touched;
3546         }
3547
3548         /**
3549          * Get the timestamp when this page was updated since the user last saw it.
3550          * @param User $user
3551          * @return mixed string/NULL
3552          */
3553         public function getNotificationTimestamp( $user = null ) {
3554                 global $wgUser, $wgShowUpdatedMarker;
3555                 // Assume current user if none given
3556                 if( !$user ) $user = $wgUser;
3557                 // Check cache first
3558                 $uid = $user->getId();
3559                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3560                         return $this->mNotificationTimestamp[$uid];
3561                 }
3562                 if( !$uid || !$wgShowUpdatedMarker ) {
3563                         return $this->mNotificationTimestamp[$uid] = false;
3564                 }
3565                 // Don't cache too much!
3566                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3567                         $this->mNotificationTimestamp = array();
3568                 }
3569                 $dbr = wfGetDB( DB_SLAVE );
3570                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3571                         'wl_notificationtimestamp',
3572                         array( 'wl_namespace' => $this->getNamespace(),
3573                                 'wl_title' => $this->getDBkey(),
3574                                 'wl_user' => $user->getId()
3575                         ),
3576                         __METHOD__
3577                 );
3578                 return $this->mNotificationTimestamp[$uid];
3579         }
3580
3581         /**
3582          * Get the trackback URL for this page
3583          * @return \type{\string} Trackback URL
3584          */
3585         public function trackbackURL() {
3586                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3587
3588                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3589                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3590         }
3591
3592         /**
3593          * Get the trackback RDF for this page
3594          * @return \type{\string} Trackback RDF
3595          */
3596         public function trackbackRDF() {
3597                 $url = htmlspecialchars($this->getFullURL());
3598                 $title = htmlspecialchars($this->getText());
3599                 $tburl = $this->trackbackURL();
3600
3601                 // Autodiscovery RDF is placed in comments so HTML validator
3602                 // won't barf. This is a rather icky workaround, but seems
3603                 // frequently used by this kind of RDF thingy.
3604                 //
3605                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3606                 return "<!--
3607 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3608          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3609          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3610 <rdf:Description
3611    rdf:about=\"$url\"
3612    dc:identifier=\"$url\"
3613    dc:title=\"$title\"
3614    trackback:ping=\"$tburl\" />
3615 </rdf:RDF>
3616 -->";
3617         }
3618
3619         /**
3620          * Generate strings used for xml 'id' names in monobook tabs
3621          * @return \type{\string} XML 'id' name
3622          */
3623         public function getNamespaceKey( $prepend = 'nstab-' ) {
3624                 global $wgContLang;
3625                 // Gets the subject namespace if this title
3626                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
3627                 // Checks if cononical namespace name exists for namespace
3628                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
3629                         // Uses canonical namespace name
3630                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
3631                 } else {
3632                         // Uses text of namespace
3633                         $namespaceKey = $this->getSubjectNsText();
3634                 }
3635                 // Makes namespace key lowercase
3636                 $namespaceKey = $wgContLang->lc( $namespaceKey );
3637                 // Uses main
3638                 if ( $namespaceKey == '' ) {
3639                         $namespaceKey = 'main';
3640                 }
3641                 // Changes file to image for backwards compatibility
3642                 if ( $namespaceKey == 'file' ) {
3643                         $namespaceKey = 'image';
3644                 }
3645                 return $prepend . $namespaceKey;
3646         }
3647
3648         /**
3649          * Returns true if this title resolves to the named special page
3650          * @param $name \type{\string} The special page name
3651          */
3652         public function isSpecial( $name ) {
3653                 if ( $this->getNamespace() == NS_SPECIAL ) {
3654                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3655                         if ( $name == $thisName ) {
3656                                 return true;
3657                         }
3658                 }
3659                 return false;
3660         }
3661
3662         /**
3663          * If the Title refers to a special page alias which is not the local default,
3664          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3665          */
3666         public function fixSpecialName() {
3667                 if ( $this->getNamespace() == NS_SPECIAL ) {
3668                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3669                         if ( $canonicalName ) {
3670                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3671                                 if ( $localName != $this->mDbkeyform ) {
3672                                         return Title::makeTitle( NS_SPECIAL, $localName );
3673                                 }
3674                         }
3675                 }
3676                 return $this;
3677         }
3678
3679         /**
3680          * Is this Title in a namespace which contains content?
3681          * In other words, is this a content page, for the purposes of calculating
3682          * statistics, etc?
3683          *
3684          * @return \type{\bool} TRUE or FALSE
3685          */
3686         public function isContentPage() {
3687                 return MWNamespace::isContent( $this->getNamespace() );
3688         }
3689
3690         /**
3691          * Get all extant redirects to this Title
3692          *
3693          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3694          *            NULL to consider all namespaces
3695          * @return \type{\arrayof{Title}} Redirects to this title
3696          */
3697         public function getRedirectsHere( $ns = null ) {
3698                 $redirs = array();
3699
3700                 $dbr = wfGetDB( DB_SLAVE );
3701                 $where = array(
3702                         'rd_namespace' => $this->getNamespace(),
3703                         'rd_title' => $this->getDBkey(),
3704                         'rd_from = page_id'
3705                 );
3706                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3707
3708                 $res = $dbr->select(
3709                         array( 'redirect', 'page' ),
3710                         array( 'page_namespace', 'page_title' ),
3711                         $where,
3712                         __METHOD__
3713                 );
3714
3715
3716                 foreach( $res as $row ) {
3717                         $redirs[] = self::newFromRow( $row );
3718                 }
3719                 return $redirs;
3720         }
3721
3722         /**
3723          * Check if this Title is a valid redirect target
3724          *
3725          * @return \type{\bool} TRUE or FALSE
3726          */
3727         public function isValidRedirectTarget() {
3728                 global $wgInvalidRedirectTargets;
3729
3730                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3731                 if( $this->isSpecial( 'Userlogout' ) ) {
3732                         return false;
3733                 }
3734
3735                 foreach( $wgInvalidRedirectTargets as $target ) {
3736                         if( $this->isSpecial( $target ) ) {
3737                                 return false;
3738                         }
3739                 }
3740
3741                 return true;
3742         }
3743
3744         /**
3745          * Get a backlink cache object
3746          */
3747         function getBacklinkCache() {
3748                 if ( is_null( $this->mBacklinkCache ) ) {
3749                         $this->mBacklinkCache = new BacklinkCache( $this );
3750                 }
3751                 return $this->mBacklinkCache;
3752         }
3753
3754         /**
3755          * Whether the magic words __INDEX__ and __NOINDEX__ function for
3756          * this page.
3757          * @return Bool
3758          */
3759         public function canUseNoindex(){
3760                 global $wgArticleRobotPolicies, $wgContentNamespaces,
3761                        $wgExemptFromUserRobotsControl;
3762
3763                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
3764                         ? $wgContentNamespaces
3765                         : $wgExemptFromUserRobotsControl;
3766
3767                 return !in_array( $this->mNamespace, $bannedNamespaces );
3768
3769         }
3770
3771         public function getRestrictionTypes() {
3772                 global $wgRestrictionTypes;
3773                 $types = $this->exists() ? $wgRestrictionTypes : array('create');
3774
3775                 if ( $this->getNamespace() == NS_FILE ) {
3776                         $types[] = 'upload';
3777                 }
3778
3779                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
3780
3781                 return $types;
3782         }
3783 }