includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 if ( !class_exists( 'UtfNormal' ) ) {
   8         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9 }
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13
  14 /**
  15  * Constants for pr_cascade bitfield
  16  */
  17 define( 'CASCADE', 1 );
  18
  19 /**
  20  * Represents a title within MediaWiki.
  21  * Optionally may contain an interwiki designation or namespace.
  22  * @note This class can fetch various kinds of data from the database;
  23  *       however, it does so inefficiently.
  24  */
  25 class Title {
  26         /** @name Static cache variables */
  27         //@{
  28         static private $titleCache=array();
  29         static private $interwikiCache=array();
  30         //@}
  31
  32         /**
  33          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  34          * commonly used titles. On a batch operation this can become a memory leak
  35          * if not bounded. After hitting this many titles reset the cache.
  36          */
  37         const CACHE_MAX = 1000;
  38
  39
  40         /**
  41          * @name Private member variables
  42          * Please use the accessor functions instead.
  43          * @private
  44          */
  45         //@{
  46
  47         var $mTextform = '';              ///< Text form (spaces not underscores) of the main part
  48         var $mUrlform = '';               ///< URL-encoded form of the main part
  49         var $mDbkeyform = '';             ///< Main part with underscores
  50         var $mUserCaseDBKey;              ///< DB key with the initial letter in the case specified by the user
  51         var $mNamespace = NS_MAIN;        ///< Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki = '';             ///< Interwiki prefix (or null string)
  53         var $mFragment;                   ///< Title fragment (i.e. the bit after the #)
  54         var $mArticleID = -1;             ///< Article ID, fetched from the link cache on demand
  55         var $mLatestID = false;           ///< ID of most recent revision
  56         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  57         var $mOldRestrictions = false;
  58         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  59         var $mRestrictionsExpiry = array();       ///< When do the restrictions on this page expire?
  60         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  61         var $mCascadeSources;  ///< Where are the cascading restrictions coming from on this page?
  62         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  63         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  64         # Don't change the following default, NS_MAIN is hardcoded in several
  65         # places.  See bug 696.
  66         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  67                                           # Zero except in {{transclusion}} tags
  68         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  69         var $mLength = -1;                ///< The page length, 0 for special pages
  70         var $mRedirect = null;            ///< Is the article at this title a redirect?
  71         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  72         var $mBacklinkCache = null; ///< Cache of links to this title
  73         //@}
  74
  75
  76         /**
  77          * Constructor
  78          * @private
  79          */
  80         /* private */ function __construct() {}
  81
  82         /**
  83          * Create a new Title from a prefixed DB key
  84          * @param $key \type{\string} The database key, which has underscores
  85          *      instead of spaces, possibly including namespace and
  86          *      interwiki prefixes
  87          * @return \type{Title} the new object, or NULL on an error
  88          */
  89         public static function newFromDBkey( $key ) {
  90                 $t = new Title();
  91                 $t->mDbkeyform = $key;
  92                 if( $t->secureAndSplit() )
  93                         return $t;
  94                 else
  95                         return NULL;
  96         }
  97
  98         /**
  99          * Create a new Title from text, such as what one would find in a link. De-
 100          * codes any HTML entities in the text.
 101          *
 102          * @param $text             string  The link text; spaces, prefixes, and an
 103          *   initial ':' indicating the main namespace are accepted.
 104          * @param $defaultNamespace int     The namespace to use if none is speci-
 105          *   fied by a prefix.  If you want to force a specific namespace even if
 106          *   $text might begin with a namespace prefix, use makeTitle() or
 107          *   makeTitleSafe().
 108          * @return Title  The new object, or null on an error.
 109          */
 110         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 111                 if( is_object( $text ) ) {
 112                         throw new MWException( 'Title::newFromText given an object' );
 113                 }
 114
 115                 /**
 116                  * Wiki pages often contain multiple links to the same page.
 117                  * Title normalization and parsing can become expensive on
 118                  * pages with many links, so we can save a little time by
 119                  * caching them.
 120                  *
 121                  * In theory these are value objects and won't get changed...
 122                  */
 123                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 124                         return Title::$titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t = new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 static $cachedcount = 0 ;
 137                 if( $t->secureAndSplit() ) {
 138                         if( $defaultNamespace == NS_MAIN ) {
 139                                 if( $cachedcount >= self::CACHE_MAX ) {
 140                                         # Avoid memory leaks on mass operations...
 141                                         Title::$titleCache = array();
 142                                         $cachedcount=0;
 143                                 }
 144                                 $cachedcount++;
 145                                 Title::$titleCache[$text] =& $t;
 146                         }
 147                         return $t;
 148                 } else {
 149                         $ret = NULL;
 150                         return $ret;
 151                 }
 152         }
 153
 154         /**
 155          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 156          *
 157          * Example of wrong and broken code:
 158          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 159          *
 160          * Example of right code:
 161          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 162          *
 163          * Create a new Title from URL-encoded text. Ensures that
 164          * the given title's length does not exceed the maximum.
 165          * @param $url \type{\string} the title, as might be taken from a URL
 166          * @return \type{Title} the new object, or NULL on an error
 167          */
 168         public static function newFromURL( $url ) {
 169                 global $wgLegalTitleChars;
 170                 $t = new Title();
 171
 172                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 173                 # but some URLs used it as a space replacement and they still come
 174                 # from some external search tools.
 175                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 176                         $url = str_replace( '+', ' ', $url );
 177                 }
 178
 179                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 180                 if( $t->secureAndSplit() ) {
 181                         return $t;
 182                 } else {
 183                         return NULL;
 184                 }
 185         }
 186
 187         /**
 188          * Create a new Title from an article ID
 189          *
 190          * @param $id \type{\int} the page_id corresponding to the Title to create
 191          * @param $flags \type{\int} use GAID_FOR_UPDATE to use master
 192          * @return \type{Title} the new object, or NULL on an error
 193          */
 194         public static function newFromID( $id, $flags = 0 ) {
 195                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 196                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 197                 if( $row !== false ) {
 198                         $title = Title::newFromRow( $row );
 199                 } else {
 200                         $title = NULL;
 201                 }
 202                 return $title;
 203         }
 204
 205         /**
 206          * Make an array of titles from an array of IDs
 207          * @param $ids \type{\arrayof{\int}} Array of IDs
 208          * @return \type{\arrayof{Title}} Array of Titles
 209          */
 210         public static function newFromIDs( $ids ) {
 211                 if ( !count( $ids ) ) {
 212                         return array();
 213                 }
 214                 $dbr = wfGetDB( DB_SLAVE );
 215                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 216                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 217
 218                 $titles = array();
 219                 foreach( $res as $row ) {
 220                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 221                 }
 222                 return $titles;
 223         }
 224
 225         /**
 226          * Make a Title object from a DB row
 227          * @param $row \type{Row} (needs at least page_title,page_namespace)
 228          * @return \type{Title} corresponding Title
 229          */
 230         public static function newFromRow( $row ) {
 231                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 232
 233                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 234                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 235                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 236                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 237
 238                 return $t;
 239         }
 240
 241         /**
 242          * Create a new Title from a namespace index and a DB key.
 243          * It's assumed that $ns and $title are *valid*, for instance when
 244          * they came directly from the database or a special page name.
 245          * For convenience, spaces are converted to underscores so that
 246          * eg user_text fields can be used directly.
 247          *
 248          * @param $ns \type{\int} the namespace of the article
 249          * @param $title \type{\string} the unprefixed database key form
 250          * @param $fragment \type{\string} The link fragment (after the "#")
 251          * @return \type{Title} the new object
 252          */
 253         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 254                 $t = new Title();
 255                 $t->mInterwiki = '';
 256                 $t->mFragment = $fragment;
 257                 $t->mNamespace = $ns = intval( $ns );
 258                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 259                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 260                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 261                 $t->mTextform = str_replace( '_', ' ', $title );
 262                 return $t;
 263         }
 264
 265         /**
 266          * Create a new Title from a namespace index and a DB key.
 267          * The parameters will be checked for validity, which is a bit slower
 268          * than makeTitle() but safer for user-provided data.
 269          *
 270          * @param $ns \type{\int} the namespace of the article
 271          * @param $title \type{\string} the database key form
 272          * @param $fragment \type{\string} The link fragment (after the "#")
 273          * @return \type{Title} the new object, or NULL on an error
 274          */
 275         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 276                 $t = new Title();
 277                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 278                 if( $t->secureAndSplit() ) {
 279                         return $t;
 280                 } else {
 281                         return NULL;
 282                 }
 283         }
 284
 285         /**
 286          * Create a new Title for the Main Page
 287          * @return \type{Title} the new object
 288          */
 289         public static function newMainPage() {
 290                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 291                 // Don't give fatal errors if the message is broken
 292                 if ( !$title ) {
 293                         $title = Title::newFromText( 'Main Page' );
 294                 }
 295                 return $title;
 296         }
 297
 298         /**
 299          * Extract a redirect destination from a string and return the
 300          * Title, or null if the text doesn't contain a valid redirect
 301          * This will only return the very next target, useful for
 302          * the redirect table and other checks that don't need full recursion
 303          *
 304          * @param $text \type{\string} Text with possible redirect
 305          * @return \type{Title} The corresponding Title
 306          */
 307         public static function newFromRedirect( $text ) {
 308                 return self::newFromRedirectInternal( $text );
 309         }
 310
 311         /**
 312          * Extract a redirect destination from a string and return the
 313          * Title, or null if the text doesn't contain a valid redirect
 314          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 315          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 316          *
 317          * @param $text \type{\string} Text with possible redirect
 318          * @return \type{Title} The corresponding Title
 319          */
 320         public static function newFromRedirectRecurse( $text ) {
 321                 $titles = self::newFromRedirectArray( $text );
 322                 return $titles ? array_pop( $titles ) : null;
 323         }
 324
 325         /**
 326          * Extract a redirect destination from a string and return an
 327          * array of Titles, or null if the text doesn't contain a valid redirect
 328          * The last element in the array is the final destination after all redirects
 329          * have been resolved (up to $wgMaxRedirects times)
 330          *
 331          * @param $text \type{\string} Text with possible redirect
 332          * @return \type{\array} Array of Titles, with the destination last
 333          */
 334         public static function newFromRedirectArray( $text ) {
 335                 global $wgMaxRedirects;
 336                 // are redirects disabled?
 337                 if( $wgMaxRedirects < 1 )
 338                         return null;
 339                 $title = self::newFromRedirectInternal( $text );
 340                 if( is_null( $title ) )
 341                         return null;
 342                 // recursive check to follow double redirects
 343                 $recurse = $wgMaxRedirects;
 344                 $titles = array( $title );
 345                 while( --$recurse > 0 ) {
 346                         if( $title->isRedirect() ) {
 347                                 $article = new Article( $title, 0 );
 348                                 $newtitle = $article->getRedirectTarget();
 349                         } else {
 350                                 break;
 351                         }
 352                         // Redirects to some special pages are not permitted
 353                         if( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 354                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 355                                 $title = $newtitle;
 356                                 $titles[] = $newtitle;
 357                         } else {
 358                                 break;
 359                         }
 360                 }
 361                 return $titles;
 362         }
 363
 364         /**
 365          * Really extract the redirect destination
 366          * Do not call this function directly, use one of the newFromRedirect* functions above
 367          *
 368          * @param $text \type{\string} Text with possible redirect
 369          * @return \type{Title} The corresponding Title
 370          */
 371         protected static function newFromRedirectInternal( $text ) {
 372                 $redir = MagicWord::get( 'redirect' );
 373                 $text = trim($text);
 374                 if( $redir->matchStartAndRemove( $text ) ) {
 375                         // Extract the first link and see if it's usable
 376                         // Ensure that it really does come directly after #REDIRECT
 377                         // Some older redirects included a colon, so don't freak about that!
 378                         $m = array();
 379                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 380                                 // Strip preceding colon used to "escape" categories, etc.
 381                                 // and URL-decode links
 382                                 if( strpos( $m[1], '%' ) !== false ) {
 383                                         // Match behavior of inline link parsing here;
 384                                         // don't interpret + as " " most of the time!
 385                                         // It might be safe to just use rawurldecode instead, though.
 386                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 387                                 }
 388                                 $title = Title::newFromText( $m[1] );
 389                                 // If the title is a redirect to bad special pages or is invalid, return null
 390                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 391                                         return null;
 392                                 }
 393                                 return $title;
 394                         }
 395                 }
 396                 return null;
 397         }
 398
 399 #----------------------------------------------------------------------------
 400 #       Static functions
 401 #----------------------------------------------------------------------------
 402
 403         /**
 404          * Get the prefixed DB key associated with an ID
 405          * @param $id \type{\int} the page_id of the article
 406          * @return \type{Title} an object representing the article, or NULL
 407          *      if no such article was found
 408          */
 409         public static function nameOf( $id ) {
 410                 $dbr = wfGetDB( DB_SLAVE );
 411
 412                 $s = $dbr->selectRow( 'page',
 413                         array( 'page_namespace','page_title' ),
 414                         array( 'page_id' => $id ),
 415                         __METHOD__ );
 416                 if ( $s === false ) { return NULL; }
 417
 418                 $n = self::makeName( $s->page_namespace, $s->page_title );
 419                 return $n;
 420         }
 421
 422         /**
 423          * Get a regex character class describing the legal characters in a link
 424          * @return \type{\string} the list of characters, not delimited
 425          */
 426         public static function legalChars() {
 427                 global $wgLegalTitleChars;
 428                 return $wgLegalTitleChars;
 429         }
 430
 431         /**
 432          * Get a string representation of a title suitable for
 433          * including in a search index
 434          *
 435          * @param $ns \type{\int} a namespace index
 436          * @param $title \type{\string} text-form main part
 437          * @return \type{\string} a stripped-down title string ready for the
 438          *      search index
 439          */
 440         public static function indexTitle( $ns, $title ) {
 441                 global $wgContLang;
 442
 443                 $lc = SearchEngine::legalSearchChars() . '&#;';
 444                 $t = $wgContLang->stripForSearch( $title );
 445                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 446                 $t = $wgContLang->lc( $t );
 447
 448                 # Handle 's, s'
 449                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 450                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 451
 452                 $t = preg_replace( "/\\s+/", ' ', $t );
 453
 454                 if ( $ns == NS_FILE ) {
 455                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 456                 }
 457                 return trim( $t );
 458         }
 459
 460         /**
 461          * Make a prefixed DB key from a DB key and a namespace index
 462          * @param $ns \type{\int} numerical representation of the namespace
 463          * @param $title \type{\string} the DB key form the title
 464          * @param $fragment \type{\string} The link fragment (after the "#")
 465          * @return \type{\string} the prefixed form of the title
 466          */
 467         public static function makeName( $ns, $title, $fragment = '' ) {
 468                 global $wgContLang;
 469
 470                 $namespace = $wgContLang->getNsText( $ns );
 471                 $name = $namespace == '' ? $title : "$namespace:$title";
 472                 if ( strval( $fragment ) != '' ) {
 473                         $name .= '#' . $fragment;
 474                 }
 475                 return $name;
 476         }
 477
 478         /**
 479          * Determine whether the object refers to a page within
 480          * this project.
 481          *
 482          * @return \type{\bool} TRUE if this is an in-project interwiki link
 483          *      or a wikilink, FALSE otherwise
 484          */
 485         public function isLocal() {
 486                 if ( $this->mInterwiki != '' ) {
 487                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 488                 } else {
 489                         return true;
 490                 }
 491         }
 492
 493         /**
 494          * Determine whether the object refers to a page within
 495          * this project and is transcludable.
 496          *
 497          * @return \type{\bool} TRUE if this is transcludable
 498          */
 499         public function isTrans() {
 500                 if ($this->mInterwiki == '')
 501                         return false;
 502
 503                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 504         }
 505
 506         /**
 507          * Escape a text fragment, say from a link, for a URL
 508          */
 509         static function escapeFragmentForURL( $fragment ) {
 510                 global $wgEnforceHtmlIds;
 511                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 512                 # fragments appear not to work in IE (at least up to 7) or in at least
 513                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 514                 # to care if they aren't encoded.
 515                 return Sanitizer::escapeId( $fragment,
 516                         $wgEnforceHtmlIds ? 'noninitial' : 'xml' );
 517         }
 518
 519 #----------------------------------------------------------------------------
 520 #       Other stuff
 521 #----------------------------------------------------------------------------
 522
 523         /** Simple accessors */
 524         /**
 525          * Get the text form (spaces not underscores) of the main part
 526          * @return \type{\string} Main part of the title
 527          */
 528         public function getText() { return $this->mTextform; }
 529         /**
 530          * Get the URL-encoded form of the main part
 531          * @return \type{\string} Main part of the title, URL-encoded
 532          */
 533         public function getPartialURL() { return $this->mUrlform; }
 534         /**
 535          * Get the main part with underscores
 536          * @return \type{\string} Main part of the title, with underscores
 537          */
 538         public function getDBkey() { return $this->mDbkeyform; }
 539         /**
 540          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 541          * @return \type{\int} Namespace index
 542          */
 543         public function getNamespace() { return $this->mNamespace; }
 544         /**
 545          * Get the namespace text
 546          * @return \type{\string} Namespace text
 547          */
 548         public function getNsText() {
 549                 global $wgContLang, $wgCanonicalNamespaceNames;
 550
 551                 if ( '' != $this->mInterwiki ) {
 552                         // This probably shouldn't even happen. ohh man, oh yuck.
 553                         // But for interwiki transclusion it sometimes does.
 554                         // Shit. Shit shit shit.
 555                         //
 556                         // Use the canonical namespaces if possible to try to
 557                         // resolve a foreign namespace.
 558                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 559                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 560                         }
 561                 }
 562                 return $wgContLang->getNsText( $this->mNamespace );
 563         }
 564         /**
 565          * Get the DB key with the initial letter case as specified by the user
 566          * @return \type{\string} DB key
 567          */
 568         function getUserCaseDBKey() {
 569                 return $this->mUserCaseDBKey;
 570         }
 571         /**
 572          * Get the namespace text of the subject (rather than talk) page
 573          * @return \type{\string} Namespace text
 574          */
 575         public function getSubjectNsText() {
 576                 global $wgContLang;
 577                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 578         }
 579         /**
 580          * Get the namespace text of the talk page
 581          * @return \type{\string} Namespace text
 582          */
 583         public function getTalkNsText() {
 584                 global $wgContLang;
 585                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 586         }
 587         /**
 588          * Could this title have a corresponding talk page?
 589          * @return \type{\bool} TRUE or FALSE
 590          */
 591         public function canTalk() {
 592                 return( MWNamespace::canTalk( $this->mNamespace ) );
 593         }
 594         /**
 595          * Get the interwiki prefix (or null string)
 596          * @return \type{\string} Interwiki prefix
 597          */
 598         public function getInterwiki() { return $this->mInterwiki; }
 599         /**
 600          * Get the Title fragment (i.e.\ the bit after the #) in text form
 601          * @return \type{\string} Title fragment
 602          */
 603         public function getFragment() { return $this->mFragment; }
 604         /**
 605          * Get the fragment in URL form, including the "#" character if there is one
 606          * @return \type{\string} Fragment in URL form
 607          */
 608         public function getFragmentForURL() {
 609                 if ( $this->mFragment == '' ) {
 610                         return '';
 611                 } else {
 612                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 613                 }
 614         }
 615         /**
 616          * Get the default namespace index, for when there is no namespace
 617          * @return \type{\int} Default namespace index
 618          */
 619         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 620
 621         /**
 622          * Get title for search index
 623          * @return \type{\string} a stripped-down title string ready for the
 624          *      search index
 625          */
 626         public function getIndexTitle() {
 627                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 628         }
 629
 630         /**
 631          * Get the prefixed database key form
 632          * @return \type{\string} the prefixed title, with underscores and
 633          *      any interwiki and namespace prefixes
 634          */
 635         public function getPrefixedDBkey() {
 636                 $s = $this->prefix( $this->mDbkeyform );
 637                 $s = str_replace( ' ', '_', $s );
 638                 return $s;
 639         }
 640
 641         /**
 642          * Get the prefixed title with spaces.
 643          * This is the form usually used for display
 644          * @return \type{\string} the prefixed title, with spaces
 645          */
 646         public function getPrefixedText() {
 647                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 648                         $s = $this->prefix( $this->mTextform );
 649                         $s = str_replace( '_', ' ', $s );
 650                         $this->mPrefixedText = $s;
 651                 }
 652                 return $this->mPrefixedText;
 653         }
 654
 655         /**
 656          * Get the prefixed title with spaces, plus any fragment
 657          * (part beginning with '#')
 658          * @return \type{\string} the prefixed title, with spaces and
 659          *      the fragment, including '#'
 660          */
 661         public function getFullText() {
 662                 $text = $this->getPrefixedText();
 663                 if( '' != $this->mFragment ) {
 664                         $text .= '#' . $this->mFragment;
 665                 }
 666                 return $text;
 667         }
 668
 669         /**
 670          * Get the base name, i.e. the leftmost parts before the /
 671          * @return \type{\string} Base name
 672          */
 673         public function getBaseText() {
 674                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 675                         return $this->getText();
 676                 }
 677
 678                 $parts = explode( '/', $this->getText() );
 679                 # Don't discard the real title if there's no subpage involved
 680                 if( count( $parts ) > 1 )
 681                         unset( $parts[ count( $parts ) - 1 ] );
 682                 return implode( '/', $parts );
 683         }
 684
 685         /**
 686          * Get the lowest-level subpage name, i.e. the rightmost part after /
 687          * @return \type{\string} Subpage name
 688          */
 689         public function getSubpageText() {
 690                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 691                         return( $this->mTextform );
 692                 }
 693                 $parts = explode( '/', $this->mTextform );
 694                 return( $parts[ count( $parts ) - 1 ] );
 695         }
 696
 697         /**
 698          * Get a URL-encoded form of the subpage text
 699          * @return \type{\string} URL-encoded subpage name
 700          */
 701         public function getSubpageUrlForm() {
 702                 $text = $this->getSubpageText();
 703                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 704                 return( $text );
 705         }
 706
 707         /**
 708          * Get a URL-encoded title (not an actual URL) including interwiki
 709          * @return \type{\string} the URL-encoded form
 710          */
 711         public function getPrefixedURL() {
 712                 $s = $this->prefix( $this->mDbkeyform );
 713                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 714                 return $s;
 715         }
 716
 717         /**
 718          * Get a real URL referring to this title, with interwiki link and
 719          * fragment
 720          *
 721          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 722          *   links. Can be specified as an associative array as well, e.g.,
 723          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 724          * @param $variant \type{\string} language variant of url (for sr, zh..)
 725          * @return \type{\string} the URL
 726          */
 727         public function getFullURL( $query = '', $variant = false ) {
 728                 global $wgContLang, $wgServer, $wgRequest;
 729
 730                 if( is_array( $query ) ) {
 731                         $query = wfArrayToCGI( $query );
 732                 }
 733
 734                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 735                 if ( !$interwiki ) {
 736                         $url = $this->getLocalUrl( $query, $variant );
 737
 738                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 739                         // Correct fix would be to move the prepending elsewhere.
 740                         if ($wgRequest->getVal('action') != 'render') {
 741                                 $url = $wgServer . $url;
 742                         }
 743                 } else {
 744                         $baseUrl = $interwiki->getURL( );
 745
 746                         $namespace = wfUrlencode( $this->getNsText() );
 747                         if ( '' != $namespace ) {
 748                                 # Can this actually happen? Interwikis shouldn't be parsed.
 749                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 750                                 $namespace .= ':';
 751                         }
 752                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 753                         $url = wfAppendQuery( $url, $query );
 754                 }
 755
 756                 # Finally, add the fragment.
 757                 $url .= $this->getFragmentForURL();
 758
 759                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 760                 return $url;
 761         }
 762
 763         /**
 764          * Get a URL with no fragment or server name.  If this page is generated
 765          * with action=render, $wgServer is prepended.
 766          * @param mixed $query an optional query string; if not specified,
 767          *       $wgArticlePath will be used.  Can be specified as an associative array
 768          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 769          *   URL-escaped).
 770          * @param $variant \type{\string} language variant of url (for sr, zh..)
 771          * @return \type{\string} the URL
 772          */
 773         public function getLocalURL( $query = '', $variant = false ) {
 774                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 775                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 776
 777                 if( is_array( $query ) ) {
 778                         $query = wfArrayToCGI( $query );
 779                 }
 780
 781                 // internal links should point to same variant as current page (only anonymous users)
 782                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 783                         $pref = $wgContLang->getPreferredVariant(false);
 784                         if($pref != $wgContLang->getCode())
 785                                 $variant = $pref;
 786                 }
 787
 788                 if ( $this->isExternal() ) {
 789                         $url = $this->getFullURL();
 790                         if ( $query ) {
 791                                 // This is currently only used for edit section links in the
 792                                 // context of interwiki transclusion. In theory we should
 793                                 // append the query to the end of any existing query string,
 794                                 // but interwiki transclusion is already broken in that case.
 795                                 $url .= "?$query";
 796                         }
 797                 } else {
 798                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 799                         if ( $query == '' ) {
 800                                 if( $variant != false && $wgContLang->hasVariants() ) {
 801                                         if( $wgVariantArticlePath == false ) {
 802                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 803                                         } else {
 804                                                 $variantArticlePath = $wgVariantArticlePath;
 805                                         }
 806                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 807                                         $url = str_replace( '$1', $dbkey, $url  );
 808                                 } else {
 809                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 810                                 }
 811                         } else {
 812                                 global $wgActionPaths;
 813                                 $url = false;
 814                                 $matches = array();
 815                                 if( !empty( $wgActionPaths ) &&
 816                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 817                                 {
 818                                         $action = urldecode( $matches[2] );
 819                                         if( isset( $wgActionPaths[$action] ) ) {
 820                                                 $query = $matches[1];
 821                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 822                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 823                                                 if( $query != '' ) {
 824                                                         $url = wfAppendQuery( $url, $query );
 825                                                 }
 826                                         }
 827                                 }
 828                                 if ( $url === false ) {
 829                                         if ( $query == '-' ) {
 830                                                 $query = '';
 831                                         }
 832                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 833                                 }
 834                         }
 835
 836                         // FIXME: this causes breakage in various places when we
 837                         // actually expected a local URL and end up with dupe prefixes.
 838                         if ($wgRequest->getVal('action') == 'render') {
 839                                 $url = $wgServer . $url;
 840                         }
 841                 }
 842                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 843                 return $url;
 844         }
 845
 846         /**
 847          * Get a URL that's the simplest URL that will be valid to link, locally,
 848          * to the current Title.  It includes the fragment, but does not include
 849          * the server unless action=render is used (or the link is external).  If
 850          * there's a fragment but the prefixed text is empty, we just return a link
 851          * to the fragment.
 852          *
 853          * The result obviously should not be URL-escaped, but does need to be
 854          * HTML-escaped if it's being output in HTML.
 855          *
 856          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 857          *   query string.  Keys and values will be escaped.
 858          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 859          *   for external links.  Default is "false" (same variant as current page,
 860          *   for anonymous users).
 861          * @return \type{\string} the URL
 862          */
 863         public function getLinkUrl( $query = array(), $variant = false ) {
 864                 wfProfileIn( __METHOD__ );
 865                 if( $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 move and edit
 969          * @return \type{\bool}
 970          */
 971         public function isProtected( $action = '' ) {
 972                 global $wgRestrictionLevels, $wgRestrictionTypes;
 973
 974                 # Special pages have inherent protection
 975                 if( $this->getNamespace() == NS_SPECIAL )
 976                         return true;
 977
 978                 # Check regular protection levels
 979                 foreach( $wgRestrictionTypes as $type ){
 980                         if( $action == $type || $action == '' ) {
 981                                 $r = $this->getRestrictions( $type );
 982                                 foreach( $wgRestrictionLevels as $level ) {
 983                                         if( in_array( $level, $r ) && $level != '' ) {
 984                                                 return true;
 985                                         }
 986                                 }
 987                         }
 988                 }
 989
 990                 return false;
 991         }
 992
 993         /**
 994          * Is $wgUser watching this page?
 995          * @return \type{\bool}
 996          */
 997         public function userIsWatching() {
 998                 global $wgUser;
 999
1000                 if ( is_null( $this->mWatched ) ) {
1001                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1002                                 $this->mWatched = false;
1003                         } else {
1004                                 $this->mWatched = $wgUser->isWatched( $this );
1005                         }
1006                 }
1007                 return $this->mWatched;
1008         }
1009
1010         /**
1011          * Can $wgUser perform $action on this page?
1012          * This skips potentially expensive cascading permission checks
1013          * as well as avoids expensive error formatting
1014          *
1015          * Suitable for use for nonessential UI controls in common cases, but
1016          * _not_ for functional access control.
1017          *
1018          * May provide false positives, but should never provide a false negative.
1019          *
1020          * @param $action \type{\string} action that permission needs to be checked for
1021          * @return \type{\bool}
1022          */
1023         public function quickUserCan( $action ) {
1024                 return $this->userCan( $action, false );
1025         }
1026
1027         /**
1028          * Determines if $wgUser is unable to edit this page because it has been protected
1029          * by $wgNamespaceProtection.
1030          *
1031          * @return \type{\bool}
1032          */
1033         public function isNamespaceProtected() {
1034                 global $wgNamespaceProtection, $wgUser;
1035                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1036                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1037                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1038                                         return true;
1039                         }
1040                 }
1041                 return false;
1042         }
1043
1044         /**
1045          * Can $wgUser perform $action on this page?
1046          * @param $action \type{\string} action that permission needs to be checked for
1047          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1048          * @return \type{\bool}
1049          */
1050         public function userCan( $action, $doExpensiveQueries = true ) {
1051                 global $wgUser;
1052                 return ($this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries, true ) === array());
1053         }
1054
1055         /**
1056          * Can $user perform $action on this page?
1057          *
1058          * FIXME: This *does not* check throttles (User::pingLimiter()).
1059          *
1060          * @param $action \type{\string}action that permission needs to be checked for
1061          * @param $user \type{User} user to check
1062          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1063          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1064          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1065          */
1066         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1067                 if( !StubObject::isRealObject( $user ) ) {
1068                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1069                         global $wgUser;
1070                         $wgUser->_unstub( '', 5 );
1071                         $user = $wgUser;
1072                 }
1073                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1074
1075                 global $wgContLang;
1076                 global $wgLang;
1077                 global $wgEmailConfirmToEdit;
1078
1079                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1080                         $errors[] = array( 'confirmedittext' );
1081                 }
1082
1083                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1084                 if ( $action != 'read' && $action != 'createaccount' && $user->isBlockedFrom( $this ) ) {
1085                         $block = $user->mBlock;
1086
1087                         // This is from OutputPage::blockedPage
1088                         // Copied at r23888 by werdna
1089
1090                         $id = $user->blockedBy();
1091                         $reason = $user->blockedFor();
1092                         if( $reason == '' ) {
1093                                 $reason = wfMsg( 'blockednoreason' );
1094                         }
1095                         $ip = wfGetIP();
1096
1097                         if ( is_numeric( $id ) ) {
1098                                 $name = User::whoIs( $id );
1099                         } else {
1100                                 $name = $id;
1101                         }
1102
1103                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1104                         $blockid = $block->mId;
1105                         $blockExpiry = $user->mBlock->mExpiry;
1106                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1107
1108                         if ( $blockExpiry == 'infinity' ) {
1109                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1110                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1111
1112                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1113                                         if ( strpos( $option, ':' ) == false )
1114                                                 continue;
1115
1116                                         list ($show, $value) = explode( ":", $option );
1117
1118                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1119                                                 $blockExpiry = $show;
1120                                                 break;
1121                                         }
1122                                 }
1123                         } else {
1124                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1125                         }
1126
1127                         $intended = $user->mBlock->mAddress;
1128
1129                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1130                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1131                 }
1132
1133                 // Remove the errors being ignored.
1134
1135                 foreach( $errors as $index => $error ) {
1136                         $error_key = is_array($error) ? $error[0] : $error;
1137
1138                         if (in_array( $error_key, $ignoreErrors )) {
1139                                 unset($errors[$index]);
1140                         }
1141                 }
1142
1143                 return $errors;
1144         }
1145
1146         /**
1147          * Can $user perform $action on this page? This is an internal function,
1148          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1149          * checks on wfReadOnly() and blocks)
1150          *
1151          * @param $action \type{\string} action that permission needs to be checked for
1152          * @param $user \type{User} user to check
1153          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1154          * @param $short \type{\bool} Set this to true to stop after the first permission error.
1155          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1156          */
1157         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries=true, $short=false ) {
1158                 wfProfileIn( __METHOD__ );
1159
1160                 $errors = array();
1161
1162                 // First stop is permissions checks, which fail most often, and which are easiest to test.
1163                 if ( $action == 'move' ) {
1164                         if( !$user->isAllowed( 'move-rootuserpages' )
1165                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1166                         {
1167                                 // Show user page-specific message only if the user can move other pages
1168                                 $errors[] = array( 'cant-move-user-page' );
1169                         }
1170
1171                         // Check if user is allowed to move files if it's a file
1172                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1173                                 $errors[] = array( 'movenotallowedfile' );
1174                         }
1175
1176                         if( !$user->isAllowed( 'move' ) ) {
1177                                 // User can't move anything
1178                                 global $wgGroupPermissions;
1179                                 $userCanMove = false;
1180                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1181                                         $userCanMove = $wgGroupPermissions['user']['move'];
1182                                 }
1183                                 $autoconfirmedCanMove = false;
1184                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1185                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1186                                 }
1187                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1188                                         // custom message if logged-in users without any special rights can move
1189                                         $errors[] = array ( 'movenologintext' );
1190                                 } else {
1191                                         $errors[] = array ('movenotallowed');
1192                                 }
1193                         }
1194                 } elseif ( $action == 'create' ) {
1195                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1196                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1197                         {
1198                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1199                         }
1200                 } elseif( $action == 'move-target' ) {
1201                         if( !$user->isAllowed( 'move' ) ) {
1202                                 // User can't move anything
1203                                 $errors[] = array ('movenotallowed');
1204                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1205                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1206                         {
1207                                 // Show user page-specific message only if the user can move other pages
1208                                 $errors[] = array( 'cant-move-to-user-page' );
1209                         }
1210                 } elseif( !$user->isAllowed( $action ) ) {
1211                         $return = null;
1212
1213                         // We avoid expensive display logic for quickUserCan's and such
1214                         $groups = false;
1215                         if (!$short) {
1216                                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1217                                         User::getGroupsWithPermission( $action ) );
1218                         }
1219
1220                         if( $groups ) {
1221                                 $return = array( 'badaccess-groups',
1222                                         array( implode( ', ', $groups ), count( $groups ) ) );
1223                         } else {
1224                                 $return = array( "badaccess-group0" );
1225                         }
1226                         $errors[] = $return;
1227                 }
1228
1229                 # Short-circuit point
1230                 if( $short && count($errors) > 0 ) {
1231                         wfProfileOut( __METHOD__ );
1232                         return $errors;
1233                 }
1234
1235                 // Use getUserPermissionsErrors instead
1236                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1237                         wfProfileOut( __METHOD__ );
1238                         return $result ? array() : array( array( 'badaccess-group0' ) );
1239                 }
1240                 // Check getUserPermissionsErrors hook
1241                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1242                         if( is_array($result) && count($result) && !is_array($result[0]) )
1243                                 $errors[] = $result; # A single array representing an error
1244                         else if( is_array($result) && is_array($result[0]) )
1245                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1246                         else if( $result !== '' && is_string($result) )
1247                                 $errors[] = array($result); # A string representing a message-id
1248                         else if( $result === false )
1249                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1250                 }
1251                 # Short-circuit point
1252                 if( $short && count($errors) > 0 ) {
1253                         wfProfileOut( __METHOD__ );
1254                         return $errors;
1255                 }
1256                 // Check getUserPermissionsErrorsExpensive hook
1257                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1258                         if( is_array($result) && count($result) && !is_array($result[0]) )
1259                                 $errors[] = $result; # A single array representing an error
1260                         else if( is_array($result) && is_array($result[0]) )
1261                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1262                         else if( $result !== '' && is_string($result) )
1263                                 $errors[] = array($result); # A string representing a message-id
1264                         else if( $result === false )
1265                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1266                 }
1267                 # Short-circuit point
1268                 if( $short && count($errors) > 0 ) {
1269                         wfProfileOut( __METHOD__ );
1270                         return $errors;
1271                 }
1272
1273                 # Only 'createaccount' and 'execute' can be performed on
1274                 # special pages, which don't actually exist in the DB.
1275                 $specialOKActions = array( 'createaccount', 'execute' );
1276                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1277                         $errors[] = array('ns-specialprotected');
1278                 }
1279
1280                 # Check $wgNamespaceProtection for restricted namespaces
1281                 if( $this->isNamespaceProtected() ) {
1282                         $ns = $this->getNamespace() == NS_MAIN ?
1283                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1284                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1285                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1286                 }
1287
1288                 # Protect css/js subpages of user pages
1289                 # XXX: this might be better using restrictions
1290                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssSubpage()
1291                 #      and $this->userCanEditJsSubpage() from working
1292                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1293                 if( $this->isCssSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('editusercss') )
1294                         && $action != 'patrol'
1295                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1296                 {
1297                         $errors[] = array('customcssjsprotected');
1298                 } else if( $this->isJsSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('edituserjs') )
1299                         && $action != 'patrol'
1300                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1301                 {
1302                         $errors[] = array('customcssjsprotected');
1303                 }
1304
1305                 # Check against page_restrictions table requirements on this
1306                 # page. The user must possess all required rights for this action.
1307                 foreach( $this->getRestrictions($action) as $right ) {
1308                         // Backwards compatibility, rewrite sysop -> protect
1309                         if( $right == 'sysop' ) {
1310                                 $right = 'protect';
1311                         }
1312                         if( '' != $right && !$user->isAllowed( $right ) ) {
1313                                 // Users with 'editprotected' permission can edit protected pages
1314                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1315                                         // Users with 'editprotected' permission cannot edit protected pages
1316                                         // with cascading option turned on.
1317                                         if( $this->mCascadeRestriction ) {
1318                                                 $errors[] = array( 'protectedpagetext', $right );
1319                                         }
1320                                 } else {
1321                                         $errors[] = array( 'protectedpagetext', $right );
1322                                 }
1323                         }
1324                 }
1325                 # Short-circuit point
1326                 if( $short && count($errors) > 0 ) {
1327                         wfProfileOut( __METHOD__ );
1328                         return $errors;
1329                 }
1330
1331                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1332                         # We /could/ use the protection level on the source page, but it's fairly ugly
1333                         #  as we have to establish a precedence hierarchy for pages included by multiple
1334                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1335                         #  as they could remove the protection anyway.
1336                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1337                         # Cascading protection depends on more than this page...
1338                         # Several cascading protected pages may include this page...
1339                         # Check each cascading level
1340                         # This is only for protection restrictions, not for all actions
1341                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1342                                 foreach( $restrictions[$action] as $right ) {
1343                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1344                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1345                                                 $pages = '';
1346                                                 foreach( $cascadingSources as $page )
1347                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1348                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1349                                         }
1350                                 }
1351                         }
1352                 }
1353                 # Short-circuit point
1354                 if( $short && count($errors) > 0 ) {
1355                         wfProfileOut( __METHOD__ );
1356                         return $errors;
1357                 }
1358
1359                 if( $action == 'protect' ) {
1360                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1361                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1362                         }
1363                 }
1364
1365                 if( $action == 'create' ) {
1366                         $title_protection = $this->getTitleProtection();
1367                         if( is_array($title_protection) ) {
1368                                 extract($title_protection); // is this extract() really needed?
1369
1370                                 if( $pt_create_perm == 'sysop' ) {
1371                                         $pt_create_perm = 'protect'; // B/C
1372                                 }
1373                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1374                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1375                                 }
1376                         }
1377                 } elseif( $action == 'move' ) {
1378                         // Check for immobile pages
1379                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1380                                 // Specific message for this case
1381                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1382                         } elseif( !$this->isMovable() ) {
1383                                 // Less specific message for rarer cases
1384                                 $errors[] = array( 'immobile-page' );
1385                         }
1386                 } elseif( $action == 'move-target' ) {
1387                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1388                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1389                         } elseif( !$this->isMovable() ) {
1390                                 $errors[] = array( 'immobile-target-page' );
1391                         }
1392                 }
1393
1394                 wfProfileOut( __METHOD__ );
1395                 return $errors;
1396         }
1397
1398         /**
1399          * Is this title subject to title protection?
1400          * @return \type{\mixed} An associative array representing any existent title
1401          *   protection, or false if there's none.
1402          */
1403         private function getTitleProtection() {
1404                 // Can't protect pages in special namespaces
1405                 if ( $this->getNamespace() < 0 ) {
1406                         return false;
1407                 }
1408
1409                 // Can't protect pages that exist.
1410                 if ($this->exists()) {
1411                         return false;
1412                 }
1413
1414                 $dbr = wfGetDB( DB_SLAVE );
1415                 $res = $dbr->select( 'protected_titles', '*',
1416                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1417                         __METHOD__ );
1418
1419                 if ($row = $dbr->fetchRow( $res )) {
1420                         return $row;
1421                 } else {
1422                         return false;
1423                 }
1424         }
1425
1426         /**
1427          * Update the title protection status
1428          * @param $create_perm \type{\string} Permission required for creation
1429          * @param $reason \type{\string} Reason for protection
1430          * @param $expiry \type{\string} Expiry timestamp
1431          */
1432         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1433                 global $wgUser,$wgContLang;
1434
1435                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1436                         && $expiry == $this->mRestrictionsExpiry['create']) {
1437                         // No change
1438                         return true;
1439                 }
1440
1441                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1442
1443                 $dbw = wfGetDB( DB_MASTER );
1444
1445                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1446
1447                 $expiry_description = '';
1448                 if ( $encodedExpiry != 'infinity' ) {
1449                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',$wgContLang->timeanddate( $expiry ),
1450                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1451                 }
1452                 else {
1453                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1454                 }
1455
1456                 # Update protection table
1457                 if ($create_perm != '' ) {
1458                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1459                                 array(
1460                                         'pt_namespace' => $namespace,
1461                                         'pt_title' => $title,
1462                                         'pt_create_perm' => $create_perm,
1463                                         'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw),
1464                                         'pt_expiry' => $encodedExpiry,
1465                                         'pt_user' => $wgUser->getId(),
1466                                         'pt_reason' => $reason,
1467                                 ), __METHOD__
1468                         );
1469                 } else {
1470                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1471                                 'pt_title' => $title ), __METHOD__ );
1472                 }
1473                 # Update the protection log
1474                 if( $dbw->affectedRows() ) {
1475                         $log = new LogPage( 'protect' );
1476
1477                         if( $create_perm ) {
1478                                 $params = array("[create=$create_perm] $expiry_description",'');
1479                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
1480                         } else {
1481                                 $log->addEntry( 'unprotect', $this, $reason );
1482                         }
1483                 }
1484
1485                 return true;
1486         }
1487
1488         /**
1489          * Remove any title protection due to page existing
1490          */
1491         public function deleteTitleProtection() {
1492                 $dbw = wfGetDB( DB_MASTER );
1493
1494                 $dbw->delete( 'protected_titles',
1495                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1496                         __METHOD__ );
1497         }
1498
1499         /**
1500          * Would anybody with sufficient privileges be able to move this page?
1501          * Some pages just aren't movable.
1502          *
1503          * @return \type{\bool} TRUE or FALSE
1504          */
1505         public function isMovable() {
1506                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1507         }
1508
1509         /**
1510          * Can $wgUser read this page?
1511          * @return \type{\bool} TRUE or FALSE
1512          * @todo fold these checks into userCan()
1513          */
1514         public function userCanRead() {
1515                 global $wgUser, $wgGroupPermissions;
1516
1517                 static $useShortcut = null;
1518
1519                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1520                 if( is_null( $useShortcut ) ) {
1521                         global $wgRevokePermissions;
1522                         $useShortcut = true;
1523                         if( empty( $wgGroupPermissions['*']['read'] ) ) {
1524                                 # Not a public wiki, so no shortcut
1525                                 $useShortcut = false;
1526                         } elseif( !empty( $wgRevokePermissions ) ) {
1527                                 /*
1528                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1529                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1530                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1531                                  * reading is allowed.
1532                                  */
1533                                 foreach( $wgRevokePermissions as $perms ) {
1534                                         if( !empty( $perms['read'] ) ) {
1535                                                 # We might be removing the read right from the user, so no shortcut
1536                                                 $useShortcut = false;
1537                                                 break;
1538                                         }
1539                                 }
1540                         }
1541                 }
1542
1543                 $result = null;
1544                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1545                 if ( $result !== null ) {
1546                         return $result;
1547                 }
1548
1549                 # Shortcut for public wikis, allows skipping quite a bit of code
1550                 if ( $useShortcut )
1551                         return true;
1552
1553                 if( $wgUser->isAllowed( 'read' ) ) {
1554                         return true;
1555                 } else {
1556                         global $wgWhitelistRead;
1557
1558                         /**
1559                          * Always grant access to the login page.
1560                          * Even anons need to be able to log in.
1561                         */
1562                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1563                                 return true;
1564                         }
1565
1566                         /**
1567                          * Bail out if there isn't whitelist
1568                          */
1569                         if( !is_array($wgWhitelistRead) ) {
1570                                 return false;
1571                         }
1572
1573                         /**
1574                          * Check for explicit whitelisting
1575                          */
1576                         $name = $this->getPrefixedText();
1577                         $dbName = $this->getPrefixedDBKey();
1578                         // Check with and without underscores
1579                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1580                                 return true;
1581
1582                         /**
1583                          * Old settings might have the title prefixed with
1584                          * a colon for main-namespace pages
1585                          */
1586                         if( $this->getNamespace() == NS_MAIN ) {
1587                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1588                                         return true;
1589                         }
1590
1591                         /**
1592                          * If it's a special page, ditch the subpage bit
1593                          * and check again
1594                          */
1595                         if( $this->getNamespace() == NS_SPECIAL ) {
1596                                 $name = $this->getDBkey();
1597                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1598                                 if ( $name === false ) {
1599                                         # Invalid special page, but we show standard login required message
1600                                         return false;
1601                                 }
1602
1603                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1604                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1605                                         return true;
1606                         }
1607
1608                 }
1609                 return false;
1610         }
1611
1612         /**
1613          * Is this a talk page of some sort?
1614          * @return \type{\bool} TRUE or FALSE
1615          */
1616         public function isTalkPage() {
1617                 return MWNamespace::isTalk( $this->getNamespace() );
1618         }
1619
1620         /**
1621          * Is this a subpage?
1622          * @return \type{\bool} TRUE or FALSE
1623          */
1624         public function isSubpage() {
1625                 return MWNamespace::hasSubpages( $this->mNamespace )
1626                         ? strpos( $this->getText(), '/' ) !== false
1627                         : false;
1628         }
1629
1630         /**
1631          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1632          * @return \type{\bool} TRUE or FALSE
1633          */
1634         public function hasSubpages() {
1635                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1636                         # Duh
1637                         return false;
1638                 }
1639
1640                 # We dynamically add a member variable for the purpose of this method
1641                 # alone to cache the result.  There's no point in having it hanging
1642                 # around uninitialized in every Title object; therefore we only add it
1643                 # if needed and don't declare it statically.
1644                 if( isset( $this->mHasSubpages ) ) {
1645                         return $this->mHasSubpages;
1646                 }
1647
1648                 $subpages = $this->getSubpages( 1 );
1649                 if( $subpages instanceof TitleArray )
1650                         return $this->mHasSubpages = (bool)$subpages->count();
1651                 return $this->mHasSubpages = false;
1652         }
1653
1654         /**
1655          * Get all subpages of this page.
1656          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1657          * @return mixed TitleArray, or empty array if this page's namespace
1658          *  doesn't allow subpages
1659          */
1660         public function getSubpages( $limit = -1 ) {
1661                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1662                         return array();
1663
1664                 $dbr = wfGetDB( DB_SLAVE );
1665                 $conds['page_namespace'] = $this->getNamespace();
1666                 $conds[] = 'page_title LIKE ' . $dbr->addQuotes(
1667                                 $dbr->escapeLike( $this->getDBkey() ) . '/%' );
1668                 $options = array();
1669                 if( $limit > -1 )
1670                         $options['LIMIT'] = $limit;
1671                 return $this->mSubpages = TitleArray::newFromResult(
1672                         $dbr->select( 'page',
1673                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1674                                 $conds,
1675                                 __METHOD__,
1676                                 $options
1677                         )
1678                 );
1679         }
1680
1681         /**
1682          * Could this page contain custom CSS or JavaScript, based
1683          * on the title?
1684          *
1685          * @return \type{\bool} TRUE or FALSE
1686          */
1687         public function isCssOrJsPage() {
1688                 return $this->mNamespace == NS_MEDIAWIKI
1689                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1690         }
1691
1692         /**
1693          * Is this a .css or .js subpage of a user page?
1694          * @return \type{\bool} TRUE or FALSE
1695          */
1696         public function isCssJsSubpage() {
1697                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1698         }
1699         /**
1700          * Is this a *valid* .css or .js subpage of a user page?
1701          * Check that the corresponding skin exists
1702          * @return \type{\bool} TRUE or FALSE
1703          */
1704         public function isValidCssJsSubpage() {
1705                 if ( $this->isCssJsSubpage() ) {
1706                         $skinNames = Skin::getSkinNames();
1707                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1708                 } else {
1709                         return false;
1710                 }
1711         }
1712         /**
1713          * Trim down a .css or .js subpage title to get the corresponding skin name
1714          */
1715         public function getSkinFromCssJsSubpage() {
1716                 $subpage = explode( '/', $this->mTextform );
1717                 $subpage = $subpage[ count( $subpage ) - 1 ];
1718                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1719         }
1720         /**
1721          * Is this a .css subpage of a user page?
1722          * @return \type{\bool} TRUE or FALSE
1723          */
1724         public function isCssSubpage() {
1725                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1726         }
1727         /**
1728          * Is this a .js subpage of a user page?
1729          * @return \type{\bool} TRUE or FALSE
1730          */
1731         public function isJsSubpage() {
1732                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1733         }
1734         /**
1735          * Protect css subpages of user pages: can $wgUser edit
1736          * this page?
1737          *
1738          * @return \type{\bool} TRUE or FALSE
1739          * @todo XXX: this might be better using restrictions
1740          */
1741         public function userCanEditCssSubpage() {
1742                 global $wgUser;
1743                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('editusercss') )
1744                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1745         }
1746         /**
1747          * Protect js subpages of user pages: can $wgUser edit
1748          * this page?
1749          *
1750          * @return \type{\bool} TRUE or FALSE
1751          * @todo XXX: this might be better using restrictions
1752          */
1753         public function userCanEditJsSubpage() {
1754                 global $wgUser;
1755                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('edituserjs') )
1756                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1757         }
1758
1759         /**
1760          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1761          *
1762          * @return \type{\bool} If the page is subject to cascading restrictions.
1763          */
1764         public function isCascadeProtected() {
1765                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1766                 return ( $sources > 0 );
1767         }
1768
1769         /**
1770          * Cascading protection: Get the source of any cascading restrictions on this page.
1771          *
1772          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1773          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1774          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1775          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1776          */
1777         public function getCascadeProtectionSources( $get_pages = true ) {
1778                 global $wgRestrictionTypes;
1779
1780                 # Define our dimension of restrictions types
1781                 $pagerestrictions = array();
1782                 foreach( $wgRestrictionTypes as $action )
1783                         $pagerestrictions[$action] = array();
1784
1785                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1786                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1787                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1788                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1789                 }
1790
1791                 wfProfileIn( __METHOD__ );
1792
1793                 $dbr = wfGetDB( DB_SLAVE );
1794
1795                 if ( $this->getNamespace() == NS_FILE ) {
1796                         $tables = array ('imagelinks', 'page_restrictions');
1797                         $where_clauses = array(
1798                                 'il_to' => $this->getDBkey(),
1799                                 'il_from=pr_page',
1800                                 'pr_cascade' => 1 );
1801                 } else {
1802                         $tables = array ('templatelinks', 'page_restrictions');
1803                         $where_clauses = array(
1804                                 'tl_namespace' => $this->getNamespace(),
1805                                 'tl_title' => $this->getDBkey(),
1806                                 'tl_from=pr_page',
1807                                 'pr_cascade' => 1 );
1808                 }
1809
1810                 if ( $get_pages ) {
1811                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1812                         $where_clauses[] = 'page_id=pr_page';
1813                         $tables[] = 'page';
1814                 } else {
1815                         $cols = array( 'pr_expiry' );
1816                 }
1817
1818                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1819
1820                 $sources = $get_pages ? array() : false;
1821                 $now = wfTimestampNow();
1822                 $purgeExpired = false;
1823
1824                 foreach( $res as $row ) {
1825                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1826                         if( $expiry > $now ) {
1827                                 if ($get_pages) {
1828                                         $page_id = $row->pr_page;
1829                                         $page_ns = $row->page_namespace;
1830                                         $page_title = $row->page_title;
1831                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1832                                         # Add groups needed for each restriction type if its not already there
1833                                         # Make sure this restriction type still exists
1834                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1835                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1836                                         }
1837                                 } else {
1838                                         $sources = true;
1839                                 }
1840                         } else {
1841                                 // Trigger lazy purge of expired restrictions from the db
1842                                 $purgeExpired = true;
1843                         }
1844                 }
1845                 if( $purgeExpired ) {
1846                         Title::purgeExpiredRestrictions();
1847                 }
1848
1849                 wfProfileOut( __METHOD__ );
1850
1851                 if ( $get_pages ) {
1852                         $this->mCascadeSources = $sources;
1853                         $this->mCascadingRestrictions = $pagerestrictions;
1854                 } else {
1855                         $this->mHasCascadingRestrictions = $sources;
1856                 }
1857                 return array( $sources, $pagerestrictions );
1858         }
1859
1860         function areRestrictionsCascading() {
1861                 if (!$this->mRestrictionsLoaded) {
1862                         $this->loadRestrictions();
1863                 }
1864
1865                 return $this->mCascadeRestriction;
1866         }
1867
1868         /**
1869          * Loads a string into mRestrictions array
1870          * @param $res \type{Resource} restrictions as an SQL result.
1871          */
1872         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = NULL ) {
1873                 $rows = array();
1874                 $dbr = wfGetDB( DB_SLAVE );
1875
1876                 while( $row = $dbr->fetchObject( $res ) ) {
1877                         $rows[] = $row;
1878                 }
1879
1880                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
1881         }
1882
1883         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = NULL ) {
1884                 global $wgRestrictionTypes;
1885                 $dbr = wfGetDB( DB_SLAVE );
1886
1887                 foreach( $wgRestrictionTypes as $type ){
1888                         $this->mRestrictions[$type] = array();
1889                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1890                 }
1891
1892                 $this->mCascadeRestriction = false;
1893
1894                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1895
1896                 if ( $oldFashionedRestrictions === NULL ) {
1897                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1898                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1899                 }
1900
1901                 if ($oldFashionedRestrictions != '') {
1902
1903                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1904                                 $temp = explode( '=', trim( $restrict ) );
1905                                 if(count($temp) == 1) {
1906                                         // old old format should be treated as edit/move restriction
1907                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1908                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1909                                 } else {
1910                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1911                                 }
1912                         }
1913
1914                         $this->mOldRestrictions = true;
1915
1916                 }
1917
1918                 if( count($rows) ) {
1919                         # Current system - load second to make them override.
1920                         $now = wfTimestampNow();
1921                         $purgeExpired = false;
1922
1923                         foreach( $rows as $row ) {
1924                                 # Cycle through all the restrictions.
1925
1926                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1927                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1928                                         continue;
1929
1930                                 // This code should be refactored, now that it's being used more generally,
1931                                 // But I don't really see any harm in leaving it in Block for now -werdna
1932                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1933
1934                                 // Only apply the restrictions if they haven't expired!
1935                                 if ( !$expiry || $expiry > $now ) {
1936                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1937                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1938
1939                                         $this->mCascadeRestriction |= $row->pr_cascade;
1940                                 } else {
1941                                         // Trigger a lazy purge of expired restrictions
1942                                         $purgeExpired = true;
1943                                 }
1944                         }
1945
1946                         if( $purgeExpired ) {
1947                                 Title::purgeExpiredRestrictions();
1948                         }
1949                 }
1950
1951                 $this->mRestrictionsLoaded = true;
1952         }
1953
1954         /**
1955          * Load restrictions from the page_restrictions table
1956          */
1957         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1958                 if( !$this->mRestrictionsLoaded ) {
1959                         if ($this->exists()) {
1960                                 $dbr = wfGetDB( DB_SLAVE );
1961
1962                                 $res = $dbr->select( 'page_restrictions', '*',
1963                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1964
1965                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
1966                         } else {
1967                                 $title_protection = $this->getTitleProtection();
1968
1969                                 if (is_array($title_protection)) {
1970                                         extract($title_protection);
1971
1972                                         $now = wfTimestampNow();
1973                                         $expiry = Block::decodeExpiry($pt_expiry);
1974
1975                                         if (!$expiry || $expiry > $now) {
1976                                                 // Apply the restrictions
1977                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1978                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1979                                         } else { // Get rid of the old restrictions
1980                                                 Title::purgeExpiredRestrictions();
1981                                         }
1982                                 } else {
1983                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1984                                 }
1985                                 $this->mRestrictionsLoaded = true;
1986                         }
1987                 }
1988         }
1989
1990         /**
1991          * Purge expired restrictions from the page_restrictions table
1992          */
1993         static function purgeExpiredRestrictions() {
1994                 $dbw = wfGetDB( DB_MASTER );
1995                 $dbw->delete( 'page_restrictions',
1996                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1997                         __METHOD__ );
1998
1999                 $dbw->delete( 'protected_titles',
2000                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2001                         __METHOD__ );
2002         }
2003
2004         /**
2005          * Accessor/initialisation for mRestrictions
2006          *
2007          * @param $action \type{\string} action that permission needs to be checked for
2008          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
2009          */
2010         public function getRestrictions( $action ) {
2011                 if( !$this->mRestrictionsLoaded ) {
2012                         $this->loadRestrictions();
2013                 }
2014                 return isset( $this->mRestrictions[$action] )
2015                                 ? $this->mRestrictions[$action]
2016                                 : array();
2017         }
2018
2019         /**
2020          * Get the expiry time for the restriction against a given action
2021          * @return 14-char timestamp, or 'infinity' if the page is protected forever
2022          * or not protected at all, or false if the action is not recognised.
2023          */
2024         public function getRestrictionExpiry( $action ) {
2025                 if( !$this->mRestrictionsLoaded ) {
2026                         $this->loadRestrictions();
2027                 }
2028                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2029         }
2030
2031         /**
2032          * Is there a version of this page in the deletion archive?
2033          * @return \type{\int} the number of archived revisions
2034          */
2035         public function isDeleted() {
2036                 if( $this->getNamespace() < 0 ) {
2037                         $n = 0;
2038                 } else {
2039                         $dbr = wfGetDB( DB_SLAVE );
2040                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2041                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2042                                 __METHOD__
2043                         );
2044                         if( $this->getNamespace() == NS_FILE ) {
2045                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2046                                         array( 'fa_name' => $this->getDBkey() ),
2047                                         __METHOD__
2048                                 );
2049                         }
2050                 }
2051                 return (int)$n;
2052         }
2053
2054         /**
2055          * Is there a version of this page in the deletion archive?
2056          * @return bool
2057          */
2058         public function isDeletedQuick() {
2059                 if( $this->getNamespace() < 0 ) {
2060                         return false;
2061                 }
2062                 $dbr = wfGetDB( DB_SLAVE );
2063                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2064                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2065                         __METHOD__
2066                 );
2067                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
2068                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2069                                 array( 'fa_name' => $this->getDBkey() ),
2070                                 __METHOD__
2071                         );
2072                 }
2073                 return $deleted;
2074         }
2075
2076         /**
2077          * Get the article ID for this Title from the link cache,
2078          * adding it if necessary
2079          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2080          *      for update
2081          * @return \type{\int} the ID
2082          */
2083         public function getArticleID( $flags = 0 ) {
2084                 if( $this->getNamespace() < 0 ) {
2085                         return $this->mArticleID = 0;
2086                 }
2087                 $linkCache = LinkCache::singleton();
2088                 if( $flags & GAID_FOR_UPDATE ) {
2089                         $oldUpdate = $linkCache->forUpdate( true );
2090                         $linkCache->clearLink( $this );
2091                         $this->mArticleID = $linkCache->addLinkObj( $this );
2092                         $linkCache->forUpdate( $oldUpdate );
2093                 } else {
2094                         if( -1 == $this->mArticleID ) {
2095                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2096                         }
2097                 }
2098                 return $this->mArticleID;
2099         }
2100
2101         /**
2102          * Is this an article that is a redirect page?
2103          * Uses link cache, adding it if necessary
2104          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2105          * @return \type{\bool}
2106          */
2107         public function isRedirect( $flags = 0 ) {
2108                 if( !is_null($this->mRedirect) )
2109                         return $this->mRedirect;
2110                 # Calling getArticleID() loads the field from cache as needed
2111                 if( !$this->getArticleID($flags) ) {
2112                         return $this->mRedirect = false;
2113                 }
2114                 $linkCache = LinkCache::singleton();
2115                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2116
2117                 return $this->mRedirect;
2118         }
2119
2120         /**
2121          * What is the length of this page?
2122          * Uses link cache, adding it if necessary
2123          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2124          * @return \type{\bool}
2125          */
2126         public function getLength( $flags = 0 ) {
2127                 if( $this->mLength != -1 )
2128                         return $this->mLength;
2129                 # Calling getArticleID() loads the field from cache as needed
2130                 if( !$this->getArticleID($flags) ) {
2131                         return $this->mLength = 0;
2132                 }
2133                 $linkCache = LinkCache::singleton();
2134                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2135
2136                 return $this->mLength;
2137         }
2138
2139         /**
2140          * What is the page_latest field for this page?
2141          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2142          * @return \type{\int} or false if the page doesn't exist
2143          */
2144         public function getLatestRevID( $flags = 0 ) {
2145                 if( $this->mLatestID !== false )
2146                         return $this->mLatestID;
2147
2148                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2149                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
2150                 return $this->mLatestID;
2151         }
2152
2153         /**
2154          * This clears some fields in this object, and clears any associated
2155          * keys in the "bad links" section of the link cache.
2156          *
2157          * - This is called from Article::insertNewArticle() to allow
2158          * loading of the new page_id. It's also called from
2159          * Article::doDeleteArticle()
2160          *
2161          * @param $newid \type{\int} the new Article ID
2162          */
2163         public function resetArticleID( $newid ) {
2164                 $linkCache = LinkCache::singleton();
2165                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2166
2167                 if ( $newid === false ) { $this->mArticleID = -1; }
2168                 else { $this->mArticleID = intval( $newid ); }
2169                 $this->mRestrictionsLoaded = false;
2170                 $this->mRestrictions = array();
2171         }
2172
2173         /**
2174          * Updates page_touched for this page; called from LinksUpdate.php
2175          * @return \type{\bool} true if the update succeded
2176          */
2177         public function invalidateCache() {
2178                 if( wfReadOnly() ) {
2179                         return;
2180                 }
2181                 $dbw = wfGetDB( DB_MASTER );
2182                 $success = $dbw->update( 'page',
2183                         array( 'page_touched' => $dbw->timestamp() ),
2184                         $this->pageCond(),
2185                         __METHOD__
2186                 );
2187                 HTMLFileCache::clearFileCache( $this );
2188                 return $success;
2189         }
2190
2191         /**
2192          * Prefix some arbitrary text with the namespace or interwiki prefix
2193          * of this object
2194          *
2195          * @param $name \type{\string} the text
2196          * @return \type{\string} the prefixed text
2197          * @private
2198          */
2199         /* private */ function prefix( $name ) {
2200                 $p = '';
2201                 if ( '' != $this->mInterwiki ) {
2202                         $p = $this->mInterwiki . ':';
2203                 }
2204                 if ( 0 != $this->mNamespace ) {
2205                         $p .= $this->getNsText() . ':';
2206                 }
2207                 return $p . $name;
2208         }
2209
2210         // Returns a simple regex that will match on characters and sequences invalid in titles.
2211         //  Note that this doesn't pick up many things that could be wrong with titles, but that
2212         //  replacing this regex with something valid will make many titles valid.
2213         static function getTitleInvalidRegex() {
2214                 static $rxTc = false;
2215                 if( !$rxTc ) {
2216                         # Matching titles will be held as illegal.
2217                         $rxTc = '/' .
2218                                 # Any character not allowed is forbidden...
2219                                 '[^' . Title::legalChars() . ']' .
2220                                 # URL percent encoding sequences interfere with the ability
2221                                 # to round-trip titles -- you can't link to them consistently.
2222                                 '|%[0-9A-Fa-f]{2}' .
2223                                 # XML/HTML character references produce similar issues.
2224                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2225                                 '|&#[0-9]+;' .
2226                                 '|&#x[0-9A-Fa-f]+;' .
2227                                 '/S';
2228                 }
2229
2230                 return $rxTc;
2231         }
2232
2233         /**
2234          * Secure and split - main initialisation function for this object
2235          *
2236          * Assumes that mDbkeyform has been set, and is urldecoded
2237          * and uses underscores, but not otherwise munged.  This function
2238          * removes illegal characters, splits off the interwiki and
2239          * namespace prefixes, sets the other forms, and canonicalizes
2240          * everything.
2241          * @return \type{\bool} true on success
2242          */
2243         private function secureAndSplit() {
2244                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2245
2246                 # Initialisation
2247                 $rxTc = self::getTitleInvalidRegex();
2248
2249                 $this->mInterwiki = $this->mFragment = '';
2250                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2251
2252                 $dbkey = $this->mDbkeyform;
2253
2254                 # Strip Unicode bidi override characters.
2255                 # Sometimes they slip into cut-n-pasted page titles, where the
2256                 # override chars get included in list displays.
2257                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2258
2259                 # Clean up whitespace
2260                 # Note: use of the /u option on preg_replace here will cause
2261                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2262                 # conveniently disabling them.
2263                 #
2264                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2265                 $dbkey = trim( $dbkey, '_' );
2266
2267                 if ( '' == $dbkey ) {
2268                         return false;
2269                 }
2270
2271                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2272                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2273                         return false;
2274                 }
2275
2276                 $this->mDbkeyform = $dbkey;
2277
2278                 # Initial colon indicates main namespace rather than specified default
2279                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2280                 if ( ':' == $dbkey{0} ) {
2281                         $this->mNamespace = NS_MAIN;
2282                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2283                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2284                 }
2285
2286                 # Namespace or interwiki prefix
2287                 $firstPass = true;
2288                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2289                 do {
2290                         $m = array();
2291                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2292                                 $p = $m[1];
2293                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2294                                         # Ordinary namespace
2295                                         $dbkey = $m[2];
2296                                         $this->mNamespace = $ns;
2297                                         # For Talk:X pages, check if X has a "namespace" prefix
2298                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2299                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2300                                                         return false; # Disallow Talk:File:x type titles...
2301                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2302                                                         return false; # Disallow Talk:Interwiki:x type titles...
2303                                         }
2304                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2305                                         if( !$firstPass ) {
2306                                                 # Can't make a local interwiki link to an interwiki link.
2307                                                 # That's just crazy!
2308                                                 return false;
2309                                         }
2310
2311                                         # Interwiki link
2312                                         $dbkey = $m[2];
2313                                         $this->mInterwiki = $wgContLang->lc( $p );
2314
2315                                         # Redundant interwiki prefix to the local wiki
2316                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2317                                                 if( $dbkey == '' ) {
2318                                                         # Can't have an empty self-link
2319                                                         return false;
2320                                                 }
2321                                                 $this->mInterwiki = '';
2322                                                 $firstPass = false;
2323                                                 # Do another namespace split...
2324                                                 continue;
2325                                         }
2326
2327                                         # If there's an initial colon after the interwiki, that also
2328                                         # resets the default namespace
2329                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2330                                                 $this->mNamespace = NS_MAIN;
2331                                                 $dbkey = substr( $dbkey, 1 );
2332                                         }
2333                                 }
2334                                 # If there's no recognized interwiki or namespace,
2335                                 # then let the colon expression be part of the title.
2336                         }
2337                         break;
2338                 } while( true );
2339
2340                 # We already know that some pages won't be in the database!
2341                 #
2342                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2343                         $this->mArticleID = 0;
2344                 }
2345                 $fragment = strstr( $dbkey, '#' );
2346                 if ( false !== $fragment ) {
2347                         $this->setFragment( $fragment );
2348                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2349                         # remove whitespace again: prevents "Foo_bar_#"
2350                         # becoming "Foo_bar_"
2351                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2352                 }
2353
2354                 # Reject illegal characters.
2355                 #
2356                 if( preg_match( $rxTc, $dbkey ) ) {
2357                         return false;
2358                 }
2359
2360                 /**
2361                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2362                  * reachable due to the way web browsers deal with 'relative' URLs.
2363                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2364                  */
2365                 if ( strpos( $dbkey, '.' ) !== false &&
2366                      ( $dbkey === '.' || $dbkey === '..' ||
2367                        strpos( $dbkey, './' ) === 0  ||
2368                        strpos( $dbkey, '../' ) === 0 ||
2369                        strpos( $dbkey, '/./' ) !== false ||
2370                        strpos( $dbkey, '/../' ) !== false  ||
2371                        substr( $dbkey, -2 ) == '/.' ||
2372                        substr( $dbkey, -3 ) == '/..' ) )
2373                 {
2374                         return false;
2375                 }
2376
2377                 /**
2378                  * Magic tilde sequences? Nu-uh!
2379                  */
2380                 if( strpos( $dbkey, '~~~' ) !== false ) {
2381                         return false;
2382                 }
2383
2384                 /**
2385                  * Limit the size of titles to 255 bytes.
2386                  * This is typically the size of the underlying database field.
2387                  * We make an exception for special pages, which don't need to be stored
2388                  * in the database, and may edge over 255 bytes due to subpage syntax
2389                  * for long titles, e.g. [[Special:Block/Long name]]
2390                  */
2391                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2392                   strlen( $dbkey ) > 512 )
2393                 {
2394                         return false;
2395                 }
2396
2397                 /**
2398                  * Normally, all wiki links are forced to have
2399                  * an initial capital letter so [[foo]] and [[Foo]]
2400                  * point to the same place.
2401                  *
2402                  * Don't force it for interwikis, since the other
2403                  * site might be case-sensitive.
2404                  */
2405                 $this->mUserCaseDBKey = $dbkey;
2406                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2407                         $dbkey = $wgContLang->ucfirst( $dbkey );
2408                 }
2409
2410                 /**
2411                  * Can't make a link to a namespace alone...
2412                  * "empty" local links can only be self-links
2413                  * with a fragment identifier.
2414                  */
2415                 if( $dbkey == '' &&
2416                         $this->mInterwiki == '' &&
2417                         $this->mNamespace != NS_MAIN ) {
2418                         return false;
2419                 }
2420                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2421                 // IP names are not allowed for accounts, and can only be referring to
2422                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2423                 // there are numerous ways to present the same IP. Having sp:contribs scan
2424                 // them all is silly and having some show the edits and others not is
2425                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2426                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2427                         IP::sanitizeIP( $dbkey ) : $dbkey;
2428                 // Any remaining initial :s are illegal.
2429                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2430                         return false;
2431                 }
2432
2433                 # Fill fields
2434                 $this->mDbkeyform = $dbkey;
2435                 $this->mUrlform = wfUrlencode( $dbkey );
2436
2437                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2438
2439                 return true;
2440         }
2441
2442         /**
2443          * Set the fragment for this title. Removes the first character from the
2444          * specified fragment before setting, so it assumes you're passing it with
2445          * an initial "#".
2446          *
2447          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2448          * Still in active use privately.
2449          *
2450          * @param $fragment \type{\string} text
2451          */
2452         public function setFragment( $fragment ) {
2453                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2454         }
2455
2456         /**
2457          * Get a Title object associated with the talk page of this article
2458          * @return \type{Title} the object for the talk page
2459          */
2460         public function getTalkPage() {
2461                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2462         }
2463
2464         /**
2465          * Get a title object associated with the subject page of this
2466          * talk page
2467          *
2468          * @return \type{Title} the object for the subject page
2469          */
2470         public function getSubjectPage() {
2471                 // Is this the same title?
2472                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2473                 if( $this->getNamespace() == $subjectNS ) {
2474                         return $this;
2475                 }
2476                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2477         }
2478
2479         /**
2480          * Get an array of Title objects linking to this Title
2481          * Also stores the IDs in the link cache.
2482          *
2483          * WARNING: do not use this function on arbitrary user-supplied titles!
2484          * On heavily-used templates it will max out the memory.
2485          *
2486          * @param array $options may be FOR UPDATE
2487          * @return \type{\arrayof{Title}} the Title objects linking here
2488          */
2489         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2490                 $linkCache = LinkCache::singleton();
2491
2492                 if ( count( $options ) > 0 ) {
2493                         $db = wfGetDB( DB_MASTER );
2494                 } else {
2495                         $db = wfGetDB( DB_SLAVE );
2496                 }
2497
2498                 $res = $db->select( array( 'page', $table ),
2499                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2500                         array(
2501                                 "{$prefix}_from=page_id",
2502                                 "{$prefix}_namespace" => $this->getNamespace(),
2503                                 "{$prefix}_title"     => $this->getDBkey() ),
2504                         __METHOD__,
2505                         $options );
2506
2507                 $retVal = array();
2508                 if ( $db->numRows( $res ) ) {
2509                         foreach( $res as $row ) {
2510                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2511                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2512                                         $retVal[] = $titleObj;
2513                                 }
2514                         }
2515                 }
2516                 $db->freeResult( $res );
2517                 return $retVal;
2518         }
2519
2520         /**
2521          * Get an array of Title objects using this Title as a template
2522          * Also stores the IDs in the link cache.
2523          *
2524          * WARNING: do not use this function on arbitrary user-supplied titles!
2525          * On heavily-used templates it will max out the memory.
2526          *
2527          * @param array $options may be FOR UPDATE
2528          * @return \type{\arrayof{Title}} the Title objects linking here
2529          */
2530         public function getTemplateLinksTo( $options = array() ) {
2531                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2532         }
2533
2534         /**
2535          * Get an array of Title objects referring to non-existent articles linked from this page
2536          *
2537          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2538          * @return \type{\arrayof{Title}} the Title objects
2539          */
2540         public function getBrokenLinksFrom() {
2541                 if ( $this->getArticleId() == 0 ) {
2542                         # All links from article ID 0 are false positives
2543                         return array();
2544                 }
2545
2546                 $dbr = wfGetDB( DB_SLAVE );
2547                 $res = $dbr->select(
2548                         array( 'page', 'pagelinks' ),
2549                         array( 'pl_namespace', 'pl_title' ),
2550                         array(
2551                                 'pl_from' => $this->getArticleId(),
2552                                 'page_namespace IS NULL'
2553                         ),
2554                         __METHOD__, array(),
2555                         array(
2556                                 'page' => array(
2557                                         'LEFT JOIN',
2558                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2559                                 )
2560                         )
2561                 );
2562
2563                 $retVal = array();
2564                 foreach( $res as $row ) {
2565                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2566                 }
2567                 return $retVal;
2568         }
2569
2570
2571         /**
2572          * Get a list of URLs to purge from the Squid cache when this
2573          * page changes
2574          *
2575          * @return \type{\arrayof{\string}} the URLs
2576          */
2577         public function getSquidURLs() {
2578                 global $wgContLang;
2579
2580                 $urls = array(
2581                         $this->getInternalURL(),
2582                         $this->getInternalURL( 'action=history' )
2583                 );
2584
2585                 // purge variant urls as well
2586                 if($wgContLang->hasVariants()){
2587                         $variants = $wgContLang->getVariants();
2588                         foreach($variants as $vCode){
2589                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2590                                 $urls[] = $this->getInternalURL('',$vCode);
2591                         }
2592                 }
2593
2594                 return $urls;
2595         }
2596
2597         /**
2598          * Purge all applicable Squid URLs
2599          */
2600         public function purgeSquid() {
2601                 global $wgUseSquid;
2602                 if ( $wgUseSquid ) {
2603                         $urls = $this->getSquidURLs();
2604                         $u = new SquidUpdate( $urls );
2605                         $u->doUpdate();
2606                 }
2607         }
2608
2609         /**
2610          * Move this page without authentication
2611          * @param &$nt \type{Title} the new page Title
2612          */
2613         public function moveNoAuth( &$nt ) {
2614                 return $this->moveTo( $nt, false );
2615         }
2616
2617         /**
2618          * Check whether a given move operation would be valid.
2619          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2620          * @param &$nt \type{Title} the new title
2621          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2622          *      should be checked
2623          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2624          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2625          */
2626         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2627                 global $wgUser;
2628
2629                 $errors = array();
2630                 if( !$nt ) {
2631                         // Normally we'd add this to $errors, but we'll get
2632                         // lots of syntax errors if $nt is not an object
2633                         return array(array('badtitletext'));
2634                 }
2635                 if( $this->equals( $nt ) ) {
2636                         $errors[] = array('selfmove');
2637                 }
2638                 if( !$this->isMovable() ) {
2639                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2640                 }
2641                 if ( $nt->getInterwiki() != '' ) {
2642                         $errors[] = array( 'immobile-target-namespace-iw' );
2643                 }
2644                 if ( !$nt->isMovable() ) {
2645                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2646                 }
2647
2648                 $oldid = $this->getArticleID();
2649                 $newid = $nt->getArticleID();
2650
2651                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2652                         $errors[] = array('articleexists');
2653                 }
2654                 if ( ( '' == $this->getDBkey() ) ||
2655                          ( !$oldid ) ||
2656                      ( '' == $nt->getDBkey() ) ) {
2657                         $errors[] = array('badarticleerror');
2658                 }
2659
2660                 // Image-specific checks
2661                 if( $this->getNamespace() == NS_FILE ) {
2662                         $file = wfLocalFile( $this );
2663                         if( $file->exists() ) {
2664                                 if( $nt->getNamespace() != NS_FILE ) {
2665                                         $errors[] = array('imagenocrossnamespace');
2666                                 }
2667                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2668                                         $errors[] = array('imageinvalidfilename');
2669                                 }
2670                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2671                                         $errors[] = array('imagetypemismatch');
2672                                 }
2673                         }
2674                 }
2675
2676                 if ( $auth ) {
2677                         $errors = wfMergeErrorArrays( $errors,
2678                                 $this->getUserPermissionsErrors('move', $wgUser),
2679                                 $this->getUserPermissionsErrors('edit', $wgUser),
2680                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2681                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2682                 }
2683
2684                 $match = EditPage::matchSummarySpamRegex( $reason );
2685                 if( $match !== false ) {
2686                         // This is kind of lame, won't display nice
2687                         $errors[] = array('spamprotectiontext');
2688                 }
2689
2690                 $err = null;
2691                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2692                         $errors[] = array('hookaborted', $err);
2693                 }
2694
2695                 # The move is allowed only if (1) the target doesn't exist, or
2696                 # (2) the target is a redirect to the source, and has no history
2697                 # (so we can undo bad moves right after they're done).
2698
2699                 if ( 0 != $newid ) { # Target exists; check for validity
2700                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2701                                 $errors[] = array('articleexists');
2702                         }
2703                 } else {
2704                         $tp = $nt->getTitleProtection();
2705                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2706                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2707                                 $errors[] = array('cantmove-titleprotected');
2708                         }
2709                 }
2710                 if(empty($errors))
2711                         return true;
2712                 return $errors;
2713         }
2714
2715         /**
2716          * Move a title to a new location
2717          * @param &$nt \type{Title} the new title
2718          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2719          *      should be checked
2720          * @param $reason \type{\string} The reason for the move
2721          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2722          *  Ignored if the user doesn't have the suppressredirect right.
2723          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2724          */
2725         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2726                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2727                 if( is_array( $err ) ) {
2728                         return $err;
2729                 }
2730
2731                 // If it is a file, more it first. It is done before all other moving stuff is done because it's hard to revert
2732                 $dbw = wfGetDB( DB_MASTER );
2733                 if( $this->getNamespace() == NS_FILE ) {
2734                         $file = wfLocalFile( $this );
2735                         if( $file->exists() ) {
2736                                 $status = $file->move( $nt );
2737                                 if( !$status->isOk() ) {
2738                                         return $status->getErrorsArray();
2739                                 }
2740                         }
2741                 }
2742
2743                 $pageid = $this->getArticleID();
2744                 $protected = $this->isProtected();
2745                 if( $nt->exists() ) {
2746                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2747                         $pageCountChange = ($createRedirect ? 0 : -1);
2748                 } else { # Target didn't exist, do normal move.
2749                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2750                         $pageCountChange = ($createRedirect ? 1 : 0);
2751                 }
2752
2753                 if( is_array( $err ) ) {
2754                         return $err;
2755                 }
2756                 $redirid = $this->getArticleID();
2757
2758                 // Category memberships include a sort key which may be customized.
2759                 // If it's left as the default (the page title), we need to update
2760                 // the sort key to match the new title.
2761                 //
2762                 // Be careful to avoid resetting cl_timestamp, which may disturb
2763                 // time-based lists on some sites.
2764                 //
2765                 // Warning -- if the sort key is *explicitly* set to the old title,
2766                 // we can't actually distinguish it from a default here, and it'll
2767                 // be set to the new title even though it really shouldn't.
2768                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2769                 $dbw->update( 'categorylinks',
2770                         array(
2771                                 'cl_sortkey' => $nt->getPrefixedText(),
2772                                 'cl_timestamp=cl_timestamp' ),
2773                         array(
2774                                 'cl_from' => $pageid,
2775                                 'cl_sortkey' => $this->getPrefixedText() ),
2776                         __METHOD__ );
2777
2778                 if( $protected ) {
2779                         # Protect the redirect title as the title used to be...
2780                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2781                                 array(
2782                                         'pr_page'    => $redirid,
2783                                         'pr_type'    => 'pr_type',
2784                                         'pr_level'   => 'pr_level',
2785                                         'pr_cascade' => 'pr_cascade',
2786                                         'pr_user'    => 'pr_user',
2787                                         'pr_expiry'  => 'pr_expiry'
2788                                 ),
2789                                 array( 'pr_page' => $pageid ),
2790                                 __METHOD__,
2791                                 array( 'IGNORE' )
2792                         );
2793                         # Update the protection log
2794                         $log = new LogPage( 'protect' );
2795                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2796                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2797                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2798                 }
2799
2800                 # Update watchlists
2801                 $oldnamespace = $this->getNamespace() & ~1;
2802                 $newnamespace = $nt->getNamespace() & ~1;
2803                 $oldtitle = $this->getDBkey();
2804                 $newtitle = $nt->getDBkey();
2805
2806                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2807                         WatchedItem::duplicateEntries( $this, $nt );
2808                 }
2809
2810                 # Update search engine
2811                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2812                 $u->doUpdate();
2813                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2814                 $u->doUpdate();
2815
2816                 # Update site_stats
2817                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2818                         # No longer a content page
2819                         # Not viewed, edited, removing
2820                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2821                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2822                         # Now a content page
2823                         # Not viewed, edited, adding
2824                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2825                 } elseif( $pageCountChange ) {
2826                         # Redirect added
2827                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2828                 } else {
2829                         # Nothing special
2830                         $u = false;
2831                 }
2832                 if( $u )
2833                         $u->doUpdate();
2834                 # Update message cache for interface messages
2835                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2836                         global $wgMessageCache;
2837
2838                         # @bug 17860: old article can be deleted, if this the case,
2839                         # delete it from message cache
2840                         if ( $this->getArticleID() === 0 ) {
2841                                 $wgMessageCache->replace( $this->getDBkey(), false );
2842                         } else {
2843                                 $oldarticle = new Article( $this );
2844                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2845                         }
2846
2847                         $newarticle = new Article( $nt );
2848                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2849                 }
2850
2851                 global $wgUser;
2852                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2853                 return true;
2854         }
2855
2856         /**
2857          * Move page to a title which is at present a redirect to the
2858          * source page
2859          *
2860          * @param &$nt \type{Title} the page to move to, which should currently
2861          *      be a redirect
2862          * @param $reason \type{\string} The reason for the move
2863          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2864          *  Ignored if the user doesn't have the suppressredirect right
2865          */
2866         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2867                 global $wgUseSquid, $wgUser;
2868
2869                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2870
2871                 if ( $reason ) {
2872                         $comment .= ": $reason";
2873                 }
2874
2875                 $now = wfTimestampNow();
2876                 $newid = $nt->getArticleID();
2877                 $oldid = $this->getArticleID();
2878                 $latest = $this->getLatestRevID();
2879
2880                 $dbw = wfGetDB( DB_MASTER );
2881
2882                 $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
2883                 $newns = $nt->getNamespace();
2884                 $newdbk = $nt->getDBkey();
2885
2886                 # Delete the old redirect. We don't save it to history since
2887                 # by definition if we've got here it's rather uninteresting.
2888                 # We have to remove it so that the next step doesn't trigger
2889                 # a conflict on the unique namespace+title index...
2890                 $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
2891                 if ( !$dbw->cascadingDeletes() ) {
2892                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2893                         global $wgUseTrackbacks;
2894                         if ($wgUseTrackbacks)
2895                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2896                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2897                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2898                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2899                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2900                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2901                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2902                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2903                 }
2904                 // If the redirect was recently created, it may have an entry in recentchanges still
2905                 $dbw->delete( 'recentchanges',
2906                         array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
2907                         __METHOD__
2908                 );
2909
2910                 # Save a null revision in the page's history notifying of the move
2911                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2912                 $nullRevId = $nullRevision->insertOn( $dbw );
2913
2914                 $article = new Article( $this );
2915                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2916
2917                 # Change the name of the target page:
2918                 $dbw->update( 'page',
2919                         /* SET */ array(
2920                                 'page_touched'   => $dbw->timestamp($now),
2921                                 'page_namespace' => $nt->getNamespace(),
2922                                 'page_title'     => $nt->getDBkey(),
2923                                 'page_latest'    => $nullRevId,
2924                         ),
2925                         /* WHERE */ array( 'page_id' => $oldid ),
2926                         __METHOD__
2927                 );
2928                 $nt->resetArticleID( $oldid );
2929
2930                 # Recreate the redirect, this time in the other direction.
2931                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2932                         $mwRedir = MagicWord::get( 'redirect' );
2933                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2934                         $redirectArticle = new Article( $this );
2935                         $newid = $redirectArticle->insertOn( $dbw );
2936                         $redirectRevision = new Revision( array(
2937                                 'page'    => $newid,
2938                                 'comment' => $comment,
2939                                 'text'    => $redirectText ) );
2940                         $redirectRevision->insertOn( $dbw );
2941                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2942
2943                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2944
2945                         # Now, we record the link from the redirect to the new title.
2946                         # It should have no other outgoing links...
2947                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2948                         $dbw->insert( 'pagelinks',
2949                                 array(
2950                                         'pl_from'      => $newid,
2951                                         'pl_namespace' => $nt->getNamespace(),
2952                                         'pl_title'     => $nt->getDBkey() ),
2953                                 __METHOD__ );
2954                         $redirectSuppressed = false;
2955                 } else {
2956                         $this->resetArticleID( 0 );
2957                         $redirectSuppressed = true;
2958                 }
2959
2960                 # Log the move
2961                 $log = new LogPage( 'move' );
2962                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2963
2964                 # Purge squid
2965                 if ( $wgUseSquid ) {
2966                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2967                         $u = new SquidUpdate( $urls );
2968                         $u->doUpdate();
2969                 }
2970
2971         }
2972
2973         /**
2974          * Move page to non-existing title.
2975          * @param &$nt \type{Title} the new Title
2976          * @param $reason \type{\string} The reason for the move
2977          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2978          *  Ignored if the user doesn't have the suppressredirect right
2979          */
2980         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2981                 global $wgUseSquid, $wgUser;
2982
2983                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2984                 if ( $reason ) {
2985                         $comment .= wfMsgExt( 'colon-separator',
2986                                 array( 'escapenoentities', 'content' ) );
2987                         $comment .= $reason;
2988                 }
2989
2990                 $newid = $nt->getArticleID();
2991                 $oldid = $this->getArticleID();
2992                 $latest = $this->getLatestRevId();
2993
2994                 $dbw = wfGetDB( DB_MASTER );
2995                 $now = $dbw->timestamp();
2996
2997                 # Save a null revision in the page's history notifying of the move
2998                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2999                 if ( !is_object( $nullRevision ) ) {
3000                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3001                 }
3002                 $nullRevId = $nullRevision->insertOn( $dbw );
3003
3004                 $article = new Article( $this );
3005                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
3006
3007                 # Rename page entry
3008                 $dbw->update( 'page',
3009                         /* SET */ array(
3010                                 'page_touched'   => $now,
3011                                 'page_namespace' => $nt->getNamespace(),
3012                                 'page_title'     => $nt->getDBkey(),
3013                                 'page_latest'    => $nullRevId,
3014                         ),
3015                         /* WHERE */ array( 'page_id' => $oldid ),
3016                         __METHOD__
3017                 );
3018                 $nt->resetArticleID( $oldid );
3019
3020                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3021                         # Insert redirect
3022                         $mwRedir = MagicWord::get( 'redirect' );
3023                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3024                         $redirectArticle = new Article( $this );
3025                         $newid = $redirectArticle->insertOn( $dbw );
3026                         $redirectRevision = new Revision( array(
3027                                 'page'    => $newid,
3028                                 'comment' => $comment,
3029                                 'text'    => $redirectText ) );
3030                         $redirectRevision->insertOn( $dbw );
3031                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3032
3033                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3034
3035                         # Record the just-created redirect's linking to the page
3036                         $dbw->insert( 'pagelinks',
3037                                 array(
3038                                         'pl_from'      => $newid,
3039                                         'pl_namespace' => $nt->getNamespace(),
3040                                         'pl_title'     => $nt->getDBkey() ),
3041                                 __METHOD__ );
3042                         $redirectSuppressed = false;
3043                 } else {
3044                         $this->resetArticleID( 0 );
3045                         $redirectSuppressed = true;
3046                 }
3047
3048                 # Log the move
3049                 $log = new LogPage( 'move' );
3050                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3051
3052                 # Purge caches as per article creation
3053                 Article::onArticleCreate( $nt );
3054
3055                 # Purge old title from squid
3056                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
3057                 $this->purgeSquid();
3058
3059         }
3060
3061         /**
3062          * Move this page's subpages to be subpages of $nt
3063          * @param $nt Title Move target
3064          * @param $auth bool Whether $wgUser's permissions should be checked
3065          * @param $reason string The reason for the move
3066          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
3067          *  Ignored if the user doesn't have the 'suppressredirect' right
3068          * @return mixed array with old page titles as keys, and strings (new page titles) or
3069          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
3070          */
3071         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3072                 global $wgMaximumMovedPages;
3073                 // Check permissions
3074                 if( !$this->userCan( 'move-subpages' ) )
3075                         return array( 'cant-move-subpages' );
3076                 // Do the source and target namespaces support subpages?
3077                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
3078                         return array( 'namespace-nosubpages',
3079                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3080                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
3081                         return array( 'namespace-nosubpages',
3082                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3083
3084                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
3085                 $retval = array();
3086                 $count = 0;
3087                 foreach( $subpages as $oldSubpage ) {
3088                         $count++;
3089                         if( $count > $wgMaximumMovedPages ) {
3090                                 $retval[$oldSubpage->getPrefixedTitle()] =
3091                                                 array( 'movepage-max-pages',
3092                                                         $wgMaximumMovedPages );
3093                                 break;
3094                         }
3095
3096                         // We don't know whether this function was called before
3097                         // or after moving the root page, so check both
3098                         // $this and $nt
3099                         if( $oldSubpage->getArticleId() == $this->getArticleId() ||
3100                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3101                                 // When moving a page to a subpage of itself,
3102                                 // don't move it twice
3103                                 continue;
3104                         $newPageName = preg_replace(
3105                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
3106                                         $nt->getDBkey(), $oldSubpage->getDBkey() );
3107                         if( $oldSubpage->isTalkPage() ) {
3108                                 $newNs = $nt->getTalkPage()->getNamespace();
3109                         } else {
3110                                 $newNs = $nt->getSubjectPage()->getNamespace();
3111                         }
3112                         # Bug 14385: we need makeTitleSafe because the new page names may
3113                         # be longer than 255 characters.
3114                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3115
3116                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3117                         if( $success === true ) {
3118                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3119                         } else {
3120                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3121                         }
3122                 }
3123                 return $retval;
3124         }
3125
3126         /**
3127          * Checks if this page is just a one-rev redirect.
3128          * Adds lock, so don't use just for light purposes.
3129          *
3130          * @return \type{\bool} TRUE or FALSE
3131          */
3132         public function isSingleRevRedirect() {
3133                 $dbw = wfGetDB( DB_MASTER );
3134                 # Is it a redirect?
3135                 $row = $dbw->selectRow( 'page',
3136                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3137                         $this->pageCond(),
3138                         __METHOD__,
3139                         array( 'FOR UPDATE' )
3140                 );
3141                 # Cache some fields we may want
3142                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3143                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3144                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3145                 if( !$this->mRedirect ) {
3146                         return false;
3147                 }
3148                 # Does the article have a history?
3149                 $row = $dbw->selectField( array( 'page', 'revision'),
3150                         'rev_id',
3151                         array( 'page_namespace' => $this->getNamespace(),
3152                                 'page_title' => $this->getDBkey(),
3153                                 'page_id=rev_page',
3154                                 'page_latest != rev_id'
3155                         ),
3156                         __METHOD__,
3157                         array( 'FOR UPDATE' )
3158                 );
3159                 # Return true if there was no history
3160                 return ($row === false);
3161         }
3162
3163         /**
3164          * Checks if $this can be moved to a given Title
3165          * - Selects for update, so don't call it unless you mean business
3166          *
3167          * @param &$nt \type{Title} the new title to check
3168          * @return \type{\bool} TRUE or FALSE
3169          */
3170         public function isValidMoveTarget( $nt ) {
3171                 $dbw = wfGetDB( DB_MASTER );
3172                 # Is it an existsing file?
3173                 if( $nt->getNamespace() == NS_FILE ) {
3174                         $file = wfLocalFile( $nt );
3175                         if( $file->exists() ) {
3176                                 wfDebug( __METHOD__ . ": file exists\n" );
3177                                 return false;
3178                         }
3179                 }
3180                 # Is it a redirect with no history?
3181                 if( !$nt->isSingleRevRedirect() ) {
3182                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3183                         return false;
3184                 }
3185                 # Get the article text
3186                 $rev = Revision::newFromTitle( $nt );
3187                 $text = $rev->getText();
3188                 # Does the redirect point to the source?
3189                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3190                 $m = array();
3191                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3192                         $redirTitle = Title::newFromText( $m[1] );
3193                         if( !is_object( $redirTitle ) ||
3194                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3195                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3196                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3197                                 return false;
3198                         }
3199                 } else {
3200                         # Fail safe
3201                         wfDebug( __METHOD__ . ": failsafe\n" );
3202                         return false;
3203                 }
3204                 return true;
3205         }
3206
3207         /**
3208          * Can this title be added to a user's watchlist?
3209          *
3210          * @return \type{\bool} TRUE or FALSE
3211          */
3212         public function isWatchable() {
3213                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3214         }
3215
3216         /**
3217          * Get categories to which this Title belongs and return an array of
3218          * categories' names.
3219          *
3220          * @return \type{\array} array an array of parents in the form:
3221          *      $parent => $currentarticle
3222          */
3223         public function getParentCategories() {
3224                 global $wgContLang;
3225
3226                 $titlekey = $this->getArticleId();
3227                 $dbr = wfGetDB( DB_SLAVE );
3228                 $categorylinks = $dbr->tableName( 'categorylinks' );
3229
3230                 # NEW SQL
3231                 $sql = "SELECT * FROM $categorylinks"
3232                      ." WHERE cl_from='$titlekey'"
3233                          ." AND cl_from <> '0'"
3234                          ." ORDER BY cl_sortkey";
3235
3236                 $res = $dbr->query( $sql );
3237
3238                 if( $dbr->numRows( $res ) > 0 ) {
3239                         foreach( $res as $row )
3240                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3241                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3242                         $dbr->freeResult( $res );
3243                 } else {
3244                         $data = array();
3245                 }
3246                 return $data;
3247         }
3248
3249         /**
3250          * Get a tree of parent categories
3251          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3252          * @return \type{\array} Tree of parent categories
3253          */
3254         public function getParentCategoryTree( $children = array() ) {
3255                 $stack = array();
3256                 $parents = $this->getParentCategories();
3257
3258                 if( $parents ) {
3259                         foreach( $parents as $parent => $current ) {
3260                                 if ( array_key_exists( $parent, $children ) ) {
3261                                         # Circular reference
3262                                         $stack[$parent] = array();
3263                                 } else {
3264                                         $nt = Title::newFromText($parent);
3265                                         if ( $nt ) {
3266                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3267                                         }
3268                                 }
3269                         }
3270                         return $stack;
3271                 } else {
3272                         return array();
3273                 }
3274         }
3275
3276
3277         /**
3278          * Get an associative array for selecting this title from
3279          * the "page" table
3280          *
3281          * @return \type{\array} Selection array
3282          */
3283         public function pageCond() {
3284                 if( $this->mArticleID > 0 ) {
3285                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3286                         return array( 'page_id' => $this->mArticleID );
3287                 } else {
3288                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3289                 }
3290         }
3291
3292         /**
3293          * Get the revision ID of the previous revision
3294          *
3295          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3296          * @param $flags \type{\int} GAID_FOR_UPDATE
3297          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3298          */
3299         public function getPreviousRevisionID( $revId, $flags=0 ) {
3300                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3301                 return $db->selectField( 'revision', 'rev_id',
3302                         array(
3303                                 'rev_page' => $this->getArticleId($flags),
3304                                 'rev_id < ' . intval( $revId )
3305                         ),
3306                         __METHOD__,
3307                         array( 'ORDER BY' => 'rev_id DESC' )
3308                 );
3309         }
3310
3311         /**
3312          * Get the revision ID of the next revision
3313          *
3314          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3315          * @param $flags \type{\int} GAID_FOR_UPDATE
3316          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3317          */
3318         public function getNextRevisionID( $revId, $flags=0 ) {
3319                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3320                 return $db->selectField( 'revision', 'rev_id',
3321                         array(
3322                                 'rev_page' => $this->getArticleId($flags),
3323                                 'rev_id > ' . intval( $revId )
3324                         ),
3325                         __METHOD__,
3326                         array( 'ORDER BY' => 'rev_id' )
3327                 );
3328         }
3329
3330         /**
3331          * Get the first revision of the page
3332          *
3333          * @param $flags \type{\int} GAID_FOR_UPDATE
3334          * @return Revision (or NULL if page doesn't exist)
3335          */
3336         public function getFirstRevision( $flags=0 ) {
3337                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3338                 $pageId = $this->getArticleId($flags);
3339                 if( !$pageId ) return NULL;
3340                 $row = $db->selectRow( 'revision', '*',
3341                         array( 'rev_page' => $pageId ),
3342                         __METHOD__,
3343                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3344                 );
3345                 if( !$row ) {
3346                         return NULL;
3347                 } else {
3348                         return new Revision( $row );
3349                 }
3350         }
3351
3352         /**
3353          * Check if this is a new page
3354          *
3355          * @return bool
3356          */
3357         public function isNewPage() {
3358                 $dbr = wfGetDB( DB_SLAVE );
3359                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3360         }
3361
3362         /**
3363          * Get the oldest revision timestamp of this page
3364          *
3365          * @return string, MW timestamp
3366          */
3367         public function getEarliestRevTime() {
3368                 $dbr = wfGetDB( DB_SLAVE );
3369                 if( $this->exists() ) {
3370                         $min = $dbr->selectField( 'revision',
3371                                 'MIN(rev_timestamp)',
3372                                 array( 'rev_page' => $this->getArticleId() ),
3373                                 __METHOD__ );
3374                         return wfTimestampOrNull( TS_MW, $min );
3375                 }
3376                 return null;
3377         }
3378
3379         /**
3380          * Get the number of revisions between the given revision IDs.
3381          * Used for diffs and other things that really need it.
3382          *
3383          * @param $old \type{\int} Revision ID.
3384          * @param $new \type{\int} Revision ID.
3385          * @return \type{\int} Number of revisions between these IDs.
3386          */
3387         public function countRevisionsBetween( $old, $new ) {
3388                 $dbr = wfGetDB( DB_SLAVE );
3389                 return $dbr->selectField( 'revision', 'count(*)',
3390                         'rev_page = ' . intval( $this->getArticleId() ) .
3391                         ' AND rev_id > ' . intval( $old ) .
3392                         ' AND rev_id < ' . intval( $new ),
3393                         __METHOD__
3394                 );
3395         }
3396
3397         /**
3398          * Compare with another title.
3399          *
3400          * @param \type{Title} $title
3401          * @return \type{\bool} TRUE or FALSE
3402          */
3403         public function equals( Title $title ) {
3404                 // Note: === is necessary for proper matching of number-like titles.
3405                 return $this->getInterwiki() === $title->getInterwiki()
3406                         && $this->getNamespace() == $title->getNamespace()
3407                         && $this->getDBkey() === $title->getDBkey();
3408         }
3409
3410         /**
3411          * Callback for usort() to do title sorts by (namespace, title)
3412          */
3413         public static function compare( $a, $b ) {
3414                 if( $a->getNamespace() == $b->getNamespace() ) {
3415                         return strcmp( $a->getText(), $b->getText() );
3416                 } else {
3417                         return $a->getNamespace() - $b->getNamespace();
3418                 }
3419         }
3420
3421         /**
3422          * Return a string representation of this title
3423          *
3424          * @return \type{\string} String representation of this title
3425          */
3426         public function __toString() {
3427                 return $this->getPrefixedText();
3428         }
3429
3430         /**
3431          * Check if page exists.  For historical reasons, this function simply
3432          * checks for the existence of the title in the page table, and will
3433          * thus return false for interwiki links, special pages and the like.
3434          * If you want to know if a title can be meaningfully viewed, you should
3435          * probably call the isKnown() method instead.
3436          *
3437          * @return \type{\bool} TRUE or FALSE
3438          */
3439         public function exists() {
3440                 return $this->getArticleId() != 0;
3441         }
3442
3443         /**
3444          * Should links to this title be shown as potentially viewable (i.e. as
3445          * "bluelinks"), even if there's no record by this title in the page
3446          * table?
3447          *
3448          * This function is semi-deprecated for public use, as well as somewhat
3449          * misleadingly named.  You probably just want to call isKnown(), which
3450          * calls this function internally.
3451          *
3452          * (ISSUE: Most of these checks are cheap, but the file existence check
3453          * can potentially be quite expensive.  Including it here fixes a lot of
3454          * existing code, but we might want to add an optional parameter to skip
3455          * it and any other expensive checks.)
3456          *
3457          * @return \type{\bool} TRUE or FALSE
3458          */
3459         public function isAlwaysKnown() {
3460                 if( $this->mInterwiki != '' ) {
3461                         return true;  // any interwiki link might be viewable, for all we know
3462                 }
3463                 switch( $this->mNamespace ) {
3464                 case NS_MEDIA:
3465                 case NS_FILE:
3466                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3467                 case NS_SPECIAL:
3468                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3469                 case NS_MAIN:
3470                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3471                 case NS_MEDIAWIKI:
3472                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3473                         // the full l10n of that language to be loaded. That takes much memory and
3474                         // isn't needed. So we strip the language part away.
3475                         // Also, extension messages which are not loaded, are shown as red, because
3476                         // we don't call MessageCache::loadAllMessages.
3477                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3478                         return wfMsgWeirdKey( $basename );  // known system message
3479                 default:
3480                         return false;
3481                 }
3482         }
3483
3484         /**
3485          * Does this title refer to a page that can (or might) be meaningfully
3486          * viewed?  In particular, this function may be used to determine if
3487          * links to the title should be rendered as "bluelinks" (as opposed to
3488          * "redlinks" to non-existent pages).
3489          *
3490          * @return \type{\bool} TRUE or FALSE
3491          */
3492         public function isKnown() {
3493                 return $this->exists() || $this->isAlwaysKnown();
3494         }
3495
3496         /**
3497         * Is this in a namespace that allows actual pages?
3498         *
3499         * @return \type{\bool} TRUE or FALSE
3500         */
3501         public function canExist() {
3502                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3503         }
3504
3505         /**
3506          * Update page_touched timestamps and send squid purge messages for
3507          * pages linking to this title. May be sent to the job queue depending
3508          * on the number of links. Typically called on create and delete.
3509          */
3510         public function touchLinks() {
3511                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3512                 $u->doUpdate();
3513
3514                 if ( $this->getNamespace() == NS_CATEGORY ) {
3515                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3516                         $u->doUpdate();
3517                 }
3518         }
3519
3520         /**
3521          * Get the last touched timestamp
3522          * @param Database $db, optional db
3523          * @return \type{\string} Last touched timestamp
3524          */
3525         public function getTouched( $db = NULL ) {
3526                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3527                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3528                 return $touched;
3529         }
3530
3531         /**
3532          * Get the timestamp when this page was updated since the user last saw it.
3533          * @param User $user
3534          * @return mixed string/NULL
3535          */
3536         public function getNotificationTimestamp( $user = NULL ) {
3537                 global $wgUser, $wgShowUpdatedMarker;
3538                 // Assume current user if none given
3539                 if( !$user ) $user = $wgUser;
3540                 // Check cache first
3541                 $uid = $user->getId();
3542                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3543                         return $this->mNotificationTimestamp[$uid];
3544                 }
3545                 if( !$uid || !$wgShowUpdatedMarker ) {
3546                         return $this->mNotificationTimestamp[$uid] = false;
3547                 }
3548                 // Don't cache too much!
3549                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3550                         $this->mNotificationTimestamp = array();
3551                 }
3552                 $dbr = wfGetDB( DB_SLAVE );
3553                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3554                         'wl_notificationtimestamp',
3555                         array( 'wl_namespace' => $this->getNamespace(),
3556                                 'wl_title' => $this->getDBkey(),
3557                                 'wl_user' => $user->getId()
3558                         ),
3559                         __METHOD__
3560                 );
3561                 return $this->mNotificationTimestamp[$uid];
3562         }
3563
3564         /**
3565          * Get the trackback URL for this page
3566          * @return \type{\string} Trackback URL
3567          */
3568         public function trackbackURL() {
3569                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3570
3571                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3572                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3573         }
3574
3575         /**
3576          * Get the trackback RDF for this page
3577          * @return \type{\string} Trackback RDF
3578          */
3579         public function trackbackRDF() {
3580                 $url = htmlspecialchars($this->getFullURL());
3581                 $title = htmlspecialchars($this->getText());
3582                 $tburl = $this->trackbackURL();
3583
3584                 // Autodiscovery RDF is placed in comments so HTML validator
3585                 // won't barf. This is a rather icky workaround, but seems
3586                 // frequently used by this kind of RDF thingy.
3587                 //
3588                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3589                 return "<!--
3590 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3591          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3592          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3593 <rdf:Description
3594    rdf:about=\"$url\"
3595    dc:identifier=\"$url\"
3596    dc:title=\"$title\"
3597    trackback:ping=\"$tburl\" />
3598 </rdf:RDF>
3599 -->";
3600         }
3601
3602         /**
3603          * Generate strings used for xml 'id' names in monobook tabs
3604          * @return \type{\string} XML 'id' name
3605          */
3606         public function getNamespaceKey( $prepend = 'nstab-' ) {
3607                 global $wgContLang, $wgCanonicalNamespaceNames;
3608                 // Gets the subject namespace if this title
3609                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
3610                 // Checks if cononical namespace name exists for namespace
3611                 if ( isset( $wgCanonicalNamespaceNames[$namespace] ) ) {
3612                         // Uses canonical namespace name
3613                         $namespaceKey = $wgCanonicalNamespaceNames[$namespace];
3614                 } else {
3615                         // Uses text of namespace
3616                         $namespaceKey = $this->getSubjectNsText();
3617                 }
3618                 // Makes namespace key lowercase
3619                 $namespaceKey = $wgContLang->lc( $namespaceKey );
3620                 // Uses main
3621                 if ( $namespaceKey == '' ) {
3622                         $namespaceKey = 'main';
3623                 }
3624                 // Changes file to image for backwards compatibility
3625                 if ( $namespaceKey == 'file' ) {
3626                         $namespaceKey = 'image';
3627                 }
3628                 return $prepend . $namespaceKey;
3629         }
3630
3631         /**
3632          * Returns true if this title resolves to the named special page
3633          * @param $name \type{\string} The special page name
3634          */
3635         public function isSpecial( $name ) {
3636                 if ( $this->getNamespace() == NS_SPECIAL ) {
3637                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3638                         if ( $name == $thisName ) {
3639                                 return true;
3640                         }
3641                 }
3642                 return false;
3643         }
3644
3645         /**
3646          * If the Title refers to a special page alias which is not the local default,
3647          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3648          */
3649         public function fixSpecialName() {
3650                 if ( $this->getNamespace() == NS_SPECIAL ) {
3651                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3652                         if ( $canonicalName ) {
3653                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3654                                 if ( $localName != $this->mDbkeyform ) {
3655                                         return Title::makeTitle( NS_SPECIAL, $localName );
3656                                 }
3657                         }
3658                 }
3659                 return $this;
3660         }
3661
3662         /**
3663          * Is this Title in a namespace which contains content?
3664          * In other words, is this a content page, for the purposes of calculating
3665          * statistics, etc?
3666          *
3667          * @return \type{\bool} TRUE or FALSE
3668          */
3669         public function isContentPage() {
3670                 return MWNamespace::isContent( $this->getNamespace() );
3671         }
3672
3673         /**
3674          * Get all extant redirects to this Title
3675          *
3676          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3677          *            NULL to consider all namespaces
3678          * @return \type{\arrayof{Title}} Redirects to this title
3679          */
3680         public function getRedirectsHere( $ns = null ) {
3681                 $redirs = array();
3682
3683                 $dbr = wfGetDB( DB_SLAVE );
3684                 $where = array(
3685                         'rd_namespace' => $this->getNamespace(),
3686                         'rd_title' => $this->getDBkey(),
3687                         'rd_from = page_id'
3688                 );
3689                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3690
3691                 $res = $dbr->select(
3692                         array( 'redirect', 'page' ),
3693                         array( 'page_namespace', 'page_title' ),
3694                         $where,
3695                         __METHOD__
3696                 );
3697
3698
3699                 foreach( $res as $row ) {
3700                         $redirs[] = self::newFromRow( $row );
3701                 }
3702                 return $redirs;
3703         }
3704
3705         /**
3706          * Check if this Title is a valid redirect target
3707          *
3708          * @return \type{\bool} TRUE or FALSE
3709          */
3710         public function isValidRedirectTarget() {
3711                 global $wgInvalidRedirectTargets;
3712
3713                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3714                 if( $this->isSpecial( 'Userlogout' ) ) {
3715                         return false;
3716                 }
3717
3718                 foreach( $wgInvalidRedirectTargets as $target ) {
3719                         if( $this->isSpecial( $target ) ) {
3720                                 return false;
3721                         }
3722                 }
3723
3724                 return true;
3725         }
3726
3727         /**
3728          * Get a backlink cache object
3729          */
3730         function getBacklinkCache() {
3731                 if ( is_null( $this->mBacklinkCache ) ) {
3732                         $this->mBacklinkCache = new BacklinkCache( $this );
3733                 }
3734                 return $this->mBacklinkCache;
3735         }
3736
3737         /**
3738          * Whether the magic words __INDEX__ and __NOINDEX__ function for
3739          * this page.
3740          * @return Bool
3741          */
3742         public function canUseNoindex(){
3743                 global $wgArticleRobotPolicies, $wgContentNamespaces,
3744                        $wgExemptFromUserRobotsControl;
3745
3746                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
3747                         ? $wgContentNamespaces
3748                         : $wgExemptFromUserRobotsControl;
3749
3750                 return !in_array( $this->mNamespace, $bannedNamespaces );
3751
3752         }
3753 }