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  * Represents a title within MediaWiki.
  15  * Optionally may contain an interwiki designation or namespace.
  16  * @note This class can fetch various kinds of data from the database;
  17  *       however, it does so inefficiently.
  18  */
  19 class Title {
  20         /** @name Static cache variables */
  21         //@{
  22         static private $titleCache=array();
  23         static private $interwikiCache=array();
  24         //@}
  25
  26         /**
  27          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  28          * commonly used titles. On a batch operation this can become a memory leak
  29          * if not bounded. After hitting this many titles reset the cache.
  30          */
  31         const CACHE_MAX = 1000;
  32
  33
  34         /**
  35          * @name Private member variables
  36          * Please use the accessor functions instead.
  37          * @private
  38          */
  39         //@{
  40
  41         var $mTextform = '';              ///< Text form (spaces not underscores) of the main part
  42         var $mUrlform = '';               ///< URL-encoded form of the main part
  43         var $mDbkeyform = '';             ///< Main part with underscores
  44         var $mUserCaseDBKey;              ///< DB key with the initial letter in the case specified by the user
  45         var $mNamespace = NS_MAIN;        ///< Namespace index, i.e. one of the NS_xxxx constants
  46         var $mInterwiki = '';             ///< Interwiki prefix (or null string)
  47         var $mFragment;                   ///< Title fragment (i.e. the bit after the #)
  48         var $mArticleID = -1;             ///< Article ID, fetched from the link cache on demand
  49         var $mLatestID = false;           ///< ID of most recent revision
  50         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  51         var $mOldRestrictions = false;
  52         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  53         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  54         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  55         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  56         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  57         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  58         # Don't change the following default, NS_MAIN is hardcoded in several
  59         # places.  See bug 696.
  60         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  61                                           # Zero except in {{transclusion}} tags
  62         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  63         var $mLength = -1;                ///< The page length, 0 for special pages
  64         var $mRedirect = null;            ///< Is the article at this title a redirect?
  65         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  66         var $mBacklinkCache = null;       ///< Cache of links to this title
  67         //@}
  68
  69
  70         /**
  71          * Constructor
  72          * @private
  73          */
  74         /* private */ function __construct() {}
  75
  76         /**
  77          * Create a new Title from a prefixed DB key
  78          * @param $key \type{\string} The database key, which has underscores
  79          *      instead of spaces, possibly including namespace and
  80          *      interwiki prefixes
  81          * @return \type{Title} the new object, or NULL on an error
  82          */
  83         public static function newFromDBkey( $key ) {
  84                 $t = new Title();
  85                 $t->mDbkeyform = $key;
  86                 if( $t->secureAndSplit() )
  87                         return $t;
  88                 else
  89                         return null;
  90         }
  91
  92         /**
  93          * Create a new Title from text, such as what one would find in a link. De-
  94          * codes any HTML entities in the text.
  95          *
  96          * @param $text             string  The link text; spaces, prefixes, and an
  97          *   initial ':' indicating the main namespace are accepted.
  98          * @param $defaultNamespace int     The namespace to use if none is speci-
  99          *   fied by a prefix.  If you want to force a specific namespace even if
 100          *   $text might begin with a namespace prefix, use makeTitle() or
 101          *   makeTitleSafe().
 102          * @return Title  The new object, or null on an error.
 103          */
 104         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 105                 if( is_object( $text ) ) {
 106                         throw new MWException( 'Title::newFromText given an object' );
 107                 }
 108
 109                 /**
 110                  * Wiki pages often contain multiple links to the same page.
 111                  * Title normalization and parsing can become expensive on
 112                  * pages with many links, so we can save a little time by
 113                  * caching them.
 114                  *
 115                  * In theory these are value objects and won't get changed...
 116                  */
 117                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 118                         return Title::$titleCache[$text];
 119                 }
 120
 121                 /**
 122                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 123                  */
 124                 $filteredText = Sanitizer::decodeCharReferences( $text );
 125
 126                 $t = new Title();
 127                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 128                 $t->mDefaultNamespace = $defaultNamespace;
 129
 130                 static $cachedcount = 0 ;
 131                 if( $t->secureAndSplit() ) {
 132                         if( $defaultNamespace == NS_MAIN ) {
 133                                 if( $cachedcount >= self::CACHE_MAX ) {
 134                                         # Avoid memory leaks on mass operations...
 135                                         Title::$titleCache = array();
 136                                         $cachedcount=0;
 137                                 }
 138                                 $cachedcount++;
 139                                 Title::$titleCache[$text] =& $t;
 140                         }
 141                         return $t;
 142                 } else {
 143                         $ret = null;
 144                         return $ret;
 145                 }
 146         }
 147
 148         /**
 149          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 150          *
 151          * Example of wrong and broken code:
 152          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 153          *
 154          * Example of right code:
 155          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 156          *
 157          * Create a new Title from URL-encoded text. Ensures that
 158          * the given title's length does not exceed the maximum.
 159          * @param $url \type{\string} the title, as might be taken from a URL
 160          * @return \type{Title} the new object, or NULL on an error
 161          */
 162         public static function newFromURL( $url ) {
 163                 global $wgLegalTitleChars;
 164                 $t = new Title();
 165
 166                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 167                 # but some URLs used it as a space replacement and they still come
 168                 # from some external search tools.
 169                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 170                         $url = str_replace( '+', ' ', $url );
 171                 }
 172
 173                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 174                 if( $t->secureAndSplit() ) {
 175                         return $t;
 176                 } else {
 177                         return null;
 178                 }
 179         }
 180
 181         /**
 182          * Create a new Title from an article ID
 183          *
 184          * @param $id \type{\int} the page_id corresponding to the Title to create
 185          * @param $flags \type{\int} use GAID_FOR_UPDATE to use master
 186          * @return \type{Title} the new object, or NULL on an error
 187          */
 188         public static function newFromID( $id, $flags = 0 ) {
 189                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 190                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 191                 if( $row !== false ) {
 192                         $title = Title::newFromRow( $row );
 193                 } else {
 194                         $title = null;
 195                 }
 196                 return $title;
 197         }
 198
 199         /**
 200          * Make an array of titles from an array of IDs
 201          * @param $ids \type{\arrayof{\int}} Array of IDs
 202          * @return \type{\arrayof{Title}} Array of Titles
 203          */
 204         public static function newFromIDs( $ids ) {
 205                 if ( !count( $ids ) ) {
 206                         return array();
 207                 }
 208                 $dbr = wfGetDB( DB_SLAVE );
 209                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 210                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 211
 212                 $titles = array();
 213                 foreach( $res as $row ) {
 214                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 215                 }
 216                 return $titles;
 217         }
 218
 219         /**
 220          * Make a Title object from a DB row
 221          * @param $row \type{Row} (needs at least page_title,page_namespace)
 222          * @return \type{Title} corresponding Title
 223          */
 224         public static function newFromRow( $row ) {
 225                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 226
 227                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 228                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 229                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : null;
 230                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 231
 232                 return $t;
 233         }
 234
 235         /**
 236          * Create a new Title from a namespace index and a DB key.
 237          * It's assumed that $ns and $title are *valid*, for instance when
 238          * they came directly from the database or a special page name.
 239          * For convenience, spaces are converted to underscores so that
 240          * eg user_text fields can be used directly.
 241          *
 242          * @param $ns \type{\int} the namespace of the article
 243          * @param $title \type{\string} the unprefixed database key form
 244          * @param $fragment \type{\string} The link fragment (after the "#")
 245          * @return \type{Title} the new object
 246          */
 247         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 248                 $t = new Title();
 249                 $t->mInterwiki = '';
 250                 $t->mFragment = $fragment;
 251                 $t->mNamespace = $ns = intval( $ns );
 252                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 253                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 254                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 255                 $t->mTextform = str_replace( '_', ' ', $title );
 256                 return $t;
 257         }
 258
 259         /**
 260          * Create a new Title from a namespace index and a DB key.
 261          * The parameters will be checked for validity, which is a bit slower
 262          * than makeTitle() but safer for user-provided data.
 263          *
 264          * @param $ns \type{\int} the namespace of the article
 265          * @param $title \type{\string} the database key form
 266          * @param $fragment \type{\string} The link fragment (after the "#")
 267          * @return \type{Title} the new object, or NULL on an error
 268          */
 269         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 270                 $t = new Title();
 271                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 272                 if( $t->secureAndSplit() ) {
 273                         return $t;
 274                 } else {
 275                         return null;
 276                 }
 277         }
 278
 279         /**
 280          * Create a new Title for the Main Page
 281          * @return \type{Title} the new object
 282          */
 283         public static function newMainPage() {
 284                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 285                 // Don't give fatal errors if the message is broken
 286                 if ( !$title ) {
 287                         $title = Title::newFromText( 'Main Page' );
 288                 }
 289                 return $title;
 290         }
 291
 292         /**
 293          * Extract a redirect destination from a string and return the
 294          * Title, or null if the text doesn't contain a valid redirect
 295          * This will only return the very next target, useful for
 296          * the redirect table and other checks that don't need full recursion
 297          *
 298          * @param $text \type{\string} Text with possible redirect
 299          * @return \type{Title} The corresponding Title
 300          */
 301         public static function newFromRedirect( $text ) {
 302                 return self::newFromRedirectInternal( $text );
 303         }
 304
 305         /**
 306          * Extract a redirect destination from a string and return the
 307          * Title, or null if the text doesn't contain a valid redirect
 308          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 309          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 310          *
 311          * @param $text \type{\string} Text with possible redirect
 312          * @return \type{Title} The corresponding Title
 313          */
 314         public static function newFromRedirectRecurse( $text ) {
 315                 $titles = self::newFromRedirectArray( $text );
 316                 return $titles ? array_pop( $titles ) : null;
 317         }
 318
 319         /**
 320          * Extract a redirect destination from a string and return an
 321          * array of Titles, or null if the text doesn't contain a valid redirect
 322          * The last element in the array is the final destination after all redirects
 323          * have been resolved (up to $wgMaxRedirects times)
 324          *
 325          * @param $text \type{\string} Text with possible redirect
 326          * @return \type{\array} Array of Titles, with the destination last
 327          */
 328         public static function newFromRedirectArray( $text ) {
 329                 global $wgMaxRedirects;
 330                 // are redirects disabled?
 331                 if( $wgMaxRedirects < 1 )
 332                         return null;
 333                 $title = self::newFromRedirectInternal( $text );
 334                 if( is_null( $title ) )
 335                         return null;
 336                 // recursive check to follow double redirects
 337                 $recurse = $wgMaxRedirects;
 338                 $titles = array( $title );
 339                 while( --$recurse > 0 ) {
 340                         if( $title->isRedirect() ) {
 341                                 $article = new Article( $title, 0 );
 342                                 $newtitle = $article->getRedirectTarget();
 343                         } else {
 344                                 break;
 345                         }
 346                         // Redirects to some special pages are not permitted
 347                         if( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 348                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 349                                 $title = $newtitle;
 350                                 $titles[] = $newtitle;
 351                         } else {
 352                                 break;
 353                         }
 354                 }
 355                 return $titles;
 356         }
 357
 358         /**
 359          * Really extract the redirect destination
 360          * Do not call this function directly, use one of the newFromRedirect* functions above
 361          *
 362          * @param $text \type{\string} Text with possible redirect
 363          * @return \type{Title} The corresponding Title
 364          */
 365         protected static function newFromRedirectInternal( $text ) {
 366                 $redir = MagicWord::get( 'redirect' );
 367                 $text = trim($text);
 368                 if( $redir->matchStartAndRemove( $text ) ) {
 369                         // Extract the first link and see if it's usable
 370                         // Ensure that it really does come directly after #REDIRECT
 371                         // Some older redirects included a colon, so don't freak about that!
 372                         $m = array();
 373                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 374                                 // Strip preceding colon used to "escape" categories, etc.
 375                                 // and URL-decode links
 376                                 if( strpos( $m[1], '%' ) !== false ) {
 377                                         // Match behavior of inline link parsing here;
 378                                         // don't interpret + as " " most of the time!
 379                                         // It might be safe to just use rawurldecode instead, though.
 380                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 381                                 }
 382                                 $title = Title::newFromText( $m[1] );
 383                                 // If the title is a redirect to bad special pages or is invalid, return null
 384                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 385                                         return null;
 386                                 }
 387                                 return $title;
 388                         }
 389                 }
 390                 return null;
 391         }
 392
 393 #----------------------------------------------------------------------------
 394 #       Static functions
 395 #----------------------------------------------------------------------------
 396
 397         /**
 398          * Get the prefixed DB key associated with an ID
 399          * @param $id \type{\int} the page_id of the article
 400          * @return \type{Title} an object representing the article, or NULL
 401          *  if no such article was found
 402          */
 403         public static function nameOf( $id ) {
 404                 $dbr = wfGetDB( DB_SLAVE );
 405
 406                 $s = $dbr->selectRow( 'page',
 407                         array( 'page_namespace','page_title' ),
 408                         array( 'page_id' => $id ),
 409                         __METHOD__ );
 410                 if ( $s === false ) { return null; }
 411
 412                 $n = self::makeName( $s->page_namespace, $s->page_title );
 413                 return $n;
 414         }
 415
 416         /**
 417          * Get a regex character class describing the legal characters in a link
 418          * @return \type{\string} the list of characters, not delimited
 419          */
 420         public static function legalChars() {
 421                 global $wgLegalTitleChars;
 422                 return $wgLegalTitleChars;
 423         }
 424
 425         /**
 426          * Get a string representation of a title suitable for
 427          * including in a search index
 428          *
 429          * @param $ns \type{\int} a namespace index
 430          * @param $title \type{\string} text-form main part
 431          * @return \type{\string} a stripped-down title string ready for the
 432          *  search index
 433          */
 434         public static function indexTitle( $ns, $title ) {
 435                 global $wgContLang;
 436
 437                 $lc = SearchEngine::legalSearchChars() . '&#;';
 438                 $t = $wgContLang->normalizeForSearch( $title );
 439                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 440                 $t = $wgContLang->lc( $t );
 441
 442                 # Handle 's, s'
 443                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 444                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 445
 446                 $t = preg_replace( "/\\s+/", ' ', $t );
 447
 448                 if ( $ns == NS_FILE ) {
 449                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 450                 }
 451                 return trim( $t );
 452         }
 453
 454         /**
 455          * Make a prefixed DB key from a DB key and a namespace index
 456          * @param $ns \type{\int} numerical representation of the namespace
 457          * @param $title \type{\string} the DB key form the title
 458          * @param $fragment \type{\string} The link fragment (after the "#")
 459          * @return \type{\string} the prefixed form of the title
 460          */
 461         public static function makeName( $ns, $title, $fragment = '' ) {
 462                 global $wgContLang;
 463
 464                 $namespace = $wgContLang->getNsText( $ns );
 465                 $name = $namespace == '' ? $title : "$namespace:$title";
 466                 if ( strval( $fragment ) != '' ) {
 467                         $name .= '#' . $fragment;
 468                 }
 469                 return $name;
 470         }
 471
 472         /**
 473          * Determine whether the object refers to a page within
 474          * this project.
 475          *
 476          * @return \type{\bool} TRUE if this is an in-project interwiki link
 477          *      or a wikilink, FALSE otherwise
 478          */
 479         public function isLocal() {
 480                 if ( $this->mInterwiki != '' ) {
 481                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 482                 } else {
 483                         return true;
 484                 }
 485         }
 486
 487         /**
 488          * Determine whether the object refers to a page within
 489          * this project and is transcludable.
 490          *
 491          * @return \type{\bool} TRUE if this is transcludable
 492          */
 493         public function isTrans() {
 494                 if ($this->mInterwiki == '')
 495                         return false;
 496
 497                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 498         }
 499
 500         /**
 501          * Escape a text fragment, say from a link, for a URL
 502          */
 503         static function escapeFragmentForURL( $fragment ) {
 504                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 505                 # fragments appear not to work in IE (at least up to 7) or in at least
 506                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 507                 # to care if they aren't encoded.
 508                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 509         }
 510
 511 #----------------------------------------------------------------------------
 512 #       Other stuff
 513 #----------------------------------------------------------------------------
 514
 515         /** Simple accessors */
 516         /**
 517          * Get the text form (spaces not underscores) of the main part
 518          * @return \type{\string} Main part of the title
 519          */
 520         public function getText() { return $this->mTextform; }
 521         /**
 522          * Get the URL-encoded form of the main part
 523          * @return \type{\string} Main part of the title, URL-encoded
 524          */
 525         public function getPartialURL() { return $this->mUrlform; }
 526         /**
 527          * Get the main part with underscores
 528          * @return \type{\string} Main part of the title, with underscores
 529          */
 530         public function getDBkey() { return $this->mDbkeyform; }
 531         /**
 532          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 533          * @return \type{\int} Namespace index
 534          */
 535         public function getNamespace() { return $this->mNamespace; }
 536         /**
 537          * Get the namespace text
 538          * @return \type{\string} Namespace text
 539          */
 540         public function getNsText() {
 541                 global $wgContLang;
 542
 543                 if ( $this->mInterwiki != '' ) {
 544                         // This probably shouldn't even happen. ohh man, oh yuck.
 545                         // But for interwiki transclusion it sometimes does.
 546                         // Shit. Shit shit shit.
 547                         //
 548                         // Use the canonical namespaces if possible to try to
 549                         // resolve a foreign namespace.
 550                         if( MWNamespace::exists( $this->mNamespace ) ) {
 551                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 552                         }
 553                 }
 554                 return $wgContLang->getNsText( $this->mNamespace );
 555         }
 556         /**
 557          * Get the DB key with the initial letter case as specified by the user
 558          * @return \type{\string} DB key
 559          */
 560         function getUserCaseDBKey() {
 561                 return $this->mUserCaseDBKey;
 562         }
 563         /**
 564          * Get the namespace text of the subject (rather than talk) page
 565          * @return \type{\string} Namespace text
 566          */
 567         public function getSubjectNsText() {
 568                 global $wgContLang;
 569                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 570         }
 571         /**
 572          * Get the namespace text of the talk page
 573          * @return \type{\string} Namespace text
 574          */
 575         public function getTalkNsText() {
 576                 global $wgContLang;
 577                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 578         }
 579         /**
 580          * Could this title have a corresponding talk page?
 581          * @return \type{\bool} TRUE or FALSE
 582          */
 583         public function canTalk() {
 584                 return( MWNamespace::canTalk( $this->mNamespace ) );
 585         }
 586         /**
 587          * Get the interwiki prefix (or null string)
 588          * @return \type{\string} Interwiki prefix
 589          */
 590         public function getInterwiki() { return $this->mInterwiki; }
 591         /**
 592          * Get the Title fragment (i.e.\ the bit after the #) in text form
 593          * @return \type{\string} Title fragment
 594          */
 595         public function getFragment() { return $this->mFragment; }
 596         /**
 597          * Get the fragment in URL form, including the "#" character if there is one
 598          * @return \type{\string} Fragment in URL form
 599          */
 600         public function getFragmentForURL() {
 601                 if ( $this->mFragment == '' ) {
 602                         return '';
 603                 } else {
 604                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 605                 }
 606         }
 607         /**
 608          * Get the default namespace index, for when there is no namespace
 609          * @return \type{\int} Default namespace index
 610          */
 611         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 612
 613         /**
 614          * Get title for search index
 615          * @return \type{\string} a stripped-down title string ready for the
 616          *  search index
 617          */
 618         public function getIndexTitle() {
 619                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 620         }
 621
 622         /**
 623          * Get the prefixed database key form
 624          * @return \type{\string} the prefixed title, with underscores and
 625          *  any interwiki and namespace prefixes
 626          */
 627         public function getPrefixedDBkey() {
 628                 $s = $this->prefix( $this->mDbkeyform );
 629                 $s = str_replace( ' ', '_', $s );
 630                 return $s;
 631         }
 632
 633         /**
 634          * Get the prefixed title with spaces.
 635          * This is the form usually used for display
 636          * @return \type{\string} the prefixed title, with spaces
 637          */
 638         public function getPrefixedText() {
 639                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 640                         $s = $this->prefix( $this->mTextform );
 641                         $s = str_replace( '_', ' ', $s );
 642                         $this->mPrefixedText = $s;
 643                 }
 644                 return $this->mPrefixedText;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces, plus any fragment
 649          * (part beginning with '#')
 650          * @return \type{\string} the prefixed title, with spaces and
 651          *  the fragment, including '#'
 652          */
 653         public function getFullText() {
 654                 $text = $this->getPrefixedText();
 655                 if( $this->mFragment != '' ) {
 656                         $text .= '#' . $this->mFragment;
 657                 }
 658                 return $text;
 659         }
 660
 661         /**
 662          * Get the base name, i.e. the leftmost parts before the /
 663          * @return \type{\string} Base name
 664          */
 665         public function getBaseText() {
 666                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 667                         return $this->getText();
 668                 }
 669
 670                 $parts = explode( '/', $this->getText() );
 671                 # Don't discard the real title if there's no subpage involved
 672                 if( count( $parts ) > 1 )
 673                         unset( $parts[ count( $parts ) - 1 ] );
 674                 return implode( '/', $parts );
 675         }
 676
 677         /**
 678          * Get the lowest-level subpage name, i.e. the rightmost part after /
 679          * @return \type{\string} Subpage name
 680          */
 681         public function getSubpageText() {
 682                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 683                         return( $this->mTextform );
 684                 }
 685                 $parts = explode( '/', $this->mTextform );
 686                 return( $parts[ count( $parts ) - 1 ] );
 687         }
 688
 689         /**
 690          * Get a URL-encoded form of the subpage text
 691          * @return \type{\string} URL-encoded subpage name
 692          */
 693         public function getSubpageUrlForm() {
 694                 $text = $this->getSubpageText();
 695                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 696                 return( $text );
 697         }
 698
 699         /**
 700          * Get a URL-encoded title (not an actual URL) including interwiki
 701          * @return \type{\string} the URL-encoded form
 702          */
 703         public function getPrefixedURL() {
 704                 $s = $this->prefix( $this->mDbkeyform );
 705                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 706                 return $s;
 707         }
 708
 709         /**
 710          * Get a real URL referring to this title, with interwiki link and
 711          * fragment
 712          *
 713          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 714          *   links. Can be specified as an associative array as well, e.g.,
 715          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 716          * @param $variant \type{\string} language variant of url (for sr, zh..)
 717          * @return \type{\string} the URL
 718          */
 719         public function getFullURL( $query = '', $variant = false ) {
 720                 global $wgContLang, $wgServer, $wgRequest;
 721
 722                 if( is_array( $query ) ) {
 723                         $query = wfArrayToCGI( $query );
 724                 }
 725
 726                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 727                 if ( !$interwiki ) {
 728                         $url = $this->getLocalURL( $query, $variant );
 729
 730                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 731                         // Correct fix would be to move the prepending elsewhere.
 732                         if ($wgRequest->getVal('action') != 'render') {
 733                                 $url = $wgServer . $url;
 734                         }
 735                 } else {
 736                         $baseUrl = $interwiki->getURL( );
 737
 738                         $namespace = wfUrlencode( $this->getNsText() );
 739                         if ( $namespace != '' ) {
 740                                 # Can this actually happen? Interwikis shouldn't be parsed.
 741                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 742                                 $namespace .= ':';
 743                         }
 744                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 745                         $url = wfAppendQuery( $url, $query );
 746                 }
 747
 748                 # Finally, add the fragment.
 749                 $url .= $this->getFragmentForURL();
 750
 751                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 752                 return $url;
 753         }
 754
 755         /**
 756          * Get a URL with no fragment or server name.  If this page is generated
 757          * with action=render, $wgServer is prepended.
 758          * @param mixed $query an optional query string; if not specified,
 759          *   $wgArticlePath will be used.  Can be specified as an associative array
 760          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 761          *   URL-escaped).
 762          * @param $variant \type{\string} language variant of url (for sr, zh..)
 763          * @return \type{\string} the URL
 764          */
 765         public function getLocalURL( $query = '', $variant = false ) {
 766                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 767                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 768
 769                 if( is_array( $query ) ) {
 770                         $query = wfArrayToCGI( $query );
 771                 }
 772
 773                 // internal links should point to same variant as current page (only anonymous users)
 774                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 775                         $pref = $wgContLang->getPreferredVariant(false);
 776                         if($pref != $wgContLang->getCode())
 777                                 $variant = $pref;
 778                 }
 779
 780                 if ( $this->isExternal() ) {
 781                         $url = $this->getFullURL();
 782                         if ( $query ) {
 783                                 // This is currently only used for edit section links in the
 784                                 // context of interwiki transclusion. In theory we should
 785                                 // append the query to the end of any existing query string,
 786                                 // but interwiki transclusion is already broken in that case.
 787                                 $url .= "?$query";
 788                         }
 789                 } else {
 790                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 791                         if ( $query == '' ) {
 792                                 if( $variant != false && $wgContLang->hasVariants() ) {
 793                                         if( $wgVariantArticlePath == false ) {
 794                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 795                                         } else {
 796                                                 $variantArticlePath = $wgVariantArticlePath;
 797                                         }
 798                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 799                                         $url = str_replace( '$1', $dbkey, $url  );
 800                                 } else {
 801                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 802                                 }
 803                         } else {
 804                                 global $wgActionPaths;
 805                                 $url = false;
 806                                 $matches = array();
 807                                 if( !empty( $wgActionPaths ) &&
 808                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 809                                 {
 810                                         $action = urldecode( $matches[2] );
 811                                         if( isset( $wgActionPaths[$action] ) ) {
 812                                                 $query = $matches[1];
 813                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 814                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 815                                                 if( $query != '' ) {
 816                                                         $url = wfAppendQuery( $url, $query );
 817                                                 }
 818                                         }
 819                                 }
 820                                 if ( $url === false ) {
 821                                         if ( $query == '-' ) {
 822                                                 $query = '';
 823                                         }
 824                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 825                                 }
 826                         }
 827
 828                         // FIXME: this causes breakage in various places when we
 829                         // actually expected a local URL and end up with dupe prefixes.
 830                         if ($wgRequest->getVal('action') == 'render') {
 831                                 $url = $wgServer . $url;
 832                         }
 833                 }
 834                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 835                 return $url;
 836         }
 837
 838         /**
 839          * Get a URL that's the simplest URL that will be valid to link, locally,
 840          * to the current Title.  It includes the fragment, but does not include
 841          * the server unless action=render is used (or the link is external).  If
 842          * there's a fragment but the prefixed text is empty, we just return a link
 843          * to the fragment.
 844          *
 845          * The result obviously should not be URL-escaped, but does need to be
 846          * HTML-escaped if it's being output in HTML.
 847          *
 848          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 849          *   query string.  Keys and values will be escaped.
 850          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 851          *   for external links.  Default is "false" (same variant as current page,
 852          *   for anonymous users).
 853          * @return \type{\string} the URL
 854          */
 855         public function getLinkUrl( $query = array(), $variant = false ) {
 856                 wfProfileIn( __METHOD__ );
 857                 if( $this->isExternal() ) {
 858                         $ret = $this->getFullURL( $query );
 859                 } elseif( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
 860                         $ret = $this->getFragmentForURL();
 861                 } else {
 862                         $ret = $this->getLocalURL( $query, $variant ) . $this->getFragmentForURL();
 863                 }
 864                 wfProfileOut( __METHOD__ );
 865                 return $ret;
 866         }
 867
 868         /**
 869          * Get an HTML-escaped version of the URL form, suitable for
 870          * using in a link, without a server name or fragment
 871          * @param $query \type{\string} an optional query string
 872          * @return \type{\string} the URL
 873          */
 874         public function escapeLocalURL( $query = '' ) {
 875                 return htmlspecialchars( $this->getLocalURL( $query ) );
 876         }
 877
 878         /**
 879          * Get an HTML-escaped version of the URL form, suitable for
 880          * using in a link, including the server name and fragment
 881          *
 882          * @param $query \type{\string} an optional query string
 883          * @return \type{\string} the URL
 884          */
 885         public function escapeFullURL( $query = '' ) {
 886                 return htmlspecialchars( $this->getFullURL( $query ) );
 887         }
 888
 889         /**
 890          * Get the URL form for an internal link.
 891          * - Used in various Squid-related code, in case we have a different
 892          * internal hostname for the server from the exposed one.
 893          *
 894          * @param $query \type{\string} an optional query string
 895          * @param $variant \type{\string} language variant of url (for sr, zh..)
 896          * @return \type{\string} the URL
 897          */
 898         public function getInternalURL( $query = '', $variant = false ) {
 899                 global $wgInternalServer;
 900                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 901                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 902                 return $url;
 903         }
 904
 905         /**
 906          * Get the edit URL for this Title
 907          * @return \type{\string} the URL, or a null string if this is an
 908          *  interwiki link
 909          */
 910         public function getEditURL() {
 911                 if ( $this->mInterwiki != '' ) { return ''; }
 912                 $s = $this->getLocalURL( 'action=edit' );
 913
 914                 return $s;
 915         }
 916
 917         /**
 918          * Get the HTML-escaped displayable text form.
 919          * Used for the title field in <a> tags.
 920          * @return \type{\string} the text, including any prefixes
 921          */
 922         public function getEscapedText() {
 923                 return htmlspecialchars( $this->getPrefixedText() );
 924         }
 925
 926         /**
 927          * Is this Title interwiki?
 928          * @return \type{\bool}
 929          */
 930         public function isExternal() { return ( $this->mInterwiki != '' ); }
 931
 932         /**
 933          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 934          *
 935          * @param $action \type{\string} Action to check (default: edit)
 936          * @return \type{\bool}
 937          */
 938         public function isSemiProtected( $action = 'edit' ) {
 939                 if( $this->exists() ) {
 940                         $restrictions = $this->getRestrictions( $action );
 941                         if( count( $restrictions ) > 0 ) {
 942                                 foreach( $restrictions as $restriction ) {
 943                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 944                                                 return false;
 945                                 }
 946                         } else {
 947                                 # Not protected
 948                                 return false;
 949                         }
 950                         return true;
 951                 } else {
 952                         # If it doesn't exist, it can't be protected
 953                         return false;
 954                 }
 955         }
 956
 957         /**
 958          * Does the title correspond to a protected article?
 959          * @param $action \type{\string} the action the page is protected from,
 960          * by default checks all actions.
 961          * @return \type{\bool}
 962          */
 963         public function isProtected( $action = '' ) {
 964                 global $wgRestrictionLevels;
 965
 966                 $restrictionTypes = $this->getRestrictionTypes();
 967
 968                 # Special pages have inherent protection
 969                 if( $this->getNamespace() == NS_SPECIAL )
 970                         return true;
 971
 972                 # Check regular protection levels
 973                 foreach( $restrictionTypes as $type ){
 974                         if( $action == $type || $action == '' ) {
 975                                 $r = $this->getRestrictions( $type );
 976                                 foreach( $wgRestrictionLevels as $level ) {
 977                                         if( in_array( $level, $r ) && $level != '' ) {
 978                                                 return true;
 979                                         }
 980                                 }
 981                         }
 982                 }
 983
 984                 return false;
 985         }
 986
 987         /**
 988          * Is this a conversion table for the LanguageConverter?
 989          * @return \type{\bool}
 990          */
 991         public function isConversionTable() {
 992                 if($this->getNamespace() == NS_MEDIAWIKI
 993                    && strpos( $this->getText(), 'Conversiontable' ) !== false ) {
 994                         return true;
 995                 }
 996
 997                 return false;
 998         }
 999
1000         /**
1001          * Is $wgUser watching this page?
1002          * @return \type{\bool}
1003          */
1004         public function userIsWatching() {
1005                 global $wgUser;
1006
1007                 if ( is_null( $this->mWatched ) ) {
1008                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1009                                 $this->mWatched = false;
1010                         } else {
1011                                 $this->mWatched = $wgUser->isWatched( $this );
1012                         }
1013                 }
1014                 return $this->mWatched;
1015         }
1016
1017         /**
1018          * Can $wgUser perform $action on this page?
1019          * This skips potentially expensive cascading permission checks
1020          * as well as avoids expensive error formatting
1021          *
1022          * Suitable for use for nonessential UI controls in common cases, but
1023          * _not_ for functional access control.
1024          *
1025          * May provide false positives, but should never provide a false negative.
1026          *
1027          * @param $action \type{\string} action that permission needs to be checked for
1028          * @return \type{\bool}
1029          */
1030         public function quickUserCan( $action ) {
1031                 return $this->userCan( $action, false );
1032         }
1033
1034         /**
1035          * Determines if $wgUser is unable to edit this page because it has been protected
1036          * by $wgNamespaceProtection.
1037          *
1038          * @return \type{\bool}
1039          */
1040         public function isNamespaceProtected() {
1041                 global $wgNamespaceProtection, $wgUser;
1042                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1043                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1044                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1045                                         return true;
1046                         }
1047                 }
1048                 return false;
1049         }
1050
1051         /**
1052          * Can $wgUser perform $action on this page?
1053          * @param $action \type{\string} action that permission needs to be checked for
1054          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1055          * @return \type{\bool}
1056          */
1057         public function userCan( $action, $doExpensiveQueries = true ) {
1058                 global $wgUser;
1059                 return ($this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries, true ) === array());
1060         }
1061
1062         /**
1063          * Can $user perform $action on this page?
1064          *
1065          * FIXME: This *does not* check throttles (User::pingLimiter()).
1066          *
1067          * @param $action \type{\string}action that permission needs to be checked for
1068          * @param $user \type{User} user to check
1069          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1070          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1071          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1072          */
1073         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1074                 if( !StubObject::isRealObject( $user ) ) {
1075                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1076                         global $wgUser;
1077                         $wgUser->_unstub( '', 5 );
1078                         $user = $wgUser;
1079                 }
1080                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1081
1082                 global $wgContLang;
1083                 global $wgLang;
1084                 global $wgEmailConfirmToEdit;
1085
1086                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1087                         $errors[] = array( 'confirmedittext' );
1088                 }
1089
1090                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1091                 if ( $action != 'read' && $action != 'createaccount' && $user->isBlockedFrom( $this ) ) {
1092                         $block = $user->mBlock;
1093
1094                         // This is from OutputPage::blockedPage
1095                         // Copied at r23888 by werdna
1096
1097                         $id = $user->blockedBy();
1098                         $reason = $user->blockedFor();
1099                         if( $reason == '' ) {
1100                                 $reason = wfMsg( 'blockednoreason' );
1101                         }
1102                         $ip = wfGetIP();
1103
1104                         if ( is_numeric( $id ) ) {
1105                                 $name = User::whoIs( $id );
1106                         } else {
1107                                 $name = $id;
1108                         }
1109
1110                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1111                         $blockid = $block->mId;
1112                         $blockExpiry = $user->mBlock->mExpiry;
1113                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1114
1115                         if ( $blockExpiry == 'infinity' ) {
1116                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1117                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1118
1119                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1120                                         if ( strpos( $option, ':' ) == false )
1121                                                 continue;
1122
1123                                         list ($show, $value) = explode( ":", $option );
1124
1125                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1126                                                 $blockExpiry = $show;
1127                                                 break;
1128                                         }
1129                                 }
1130                         } else {
1131                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1132                         }
1133
1134                         $intended = $user->mBlock->mAddress;
1135
1136                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1137                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1138                 }
1139
1140                 // Remove the errors being ignored.
1141
1142                 foreach( $errors as $index => $error ) {
1143                         $error_key = is_array($error) ? $error[0] : $error;
1144
1145                         if (in_array( $error_key, $ignoreErrors )) {
1146                                 unset($errors[$index]);
1147                         }
1148                 }
1149
1150                 return $errors;
1151         }
1152
1153         /**
1154          * Can $user perform $action on this page? This is an internal function,
1155          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1156          * checks on wfReadOnly() and blocks)
1157          *
1158          * @param $action \type{\string} action that permission needs to be checked for
1159          * @param $user \type{User} user to check
1160          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1161          * @param $short \type{\bool} Set this to true to stop after the first permission error.
1162          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1163          */
1164         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries=true, $short=false ) {
1165                 wfProfileIn( __METHOD__ );
1166
1167                 $errors = array();
1168
1169                 // First stop is permissions checks, which fail most often, and which are easiest to test.
1170                 if ( $action == 'move' ) {
1171                         if( !$user->isAllowed( 'move-rootuserpages' )
1172                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1173                         {
1174                                 // Show user page-specific message only if the user can move other pages
1175                                 $errors[] = array( 'cant-move-user-page' );
1176                         }
1177
1178                         // Check if user is allowed to move files if it's a file
1179                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1180                                 $errors[] = array( 'movenotallowedfile' );
1181                         }
1182
1183                         if( !$user->isAllowed( 'move' ) ) {
1184                                 // User can't move anything
1185                                 global $wgGroupPermissions;
1186                                 $userCanMove = false;
1187                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1188                                         $userCanMove = $wgGroupPermissions['user']['move'];
1189                                 }
1190                                 $autoconfirmedCanMove = false;
1191                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1192                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1193                                 }
1194                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1195                                         // custom message if logged-in users without any special rights can move
1196                                         $errors[] = array ( 'movenologintext' );
1197                                 } else {
1198                                         $errors[] = array ('movenotallowed');
1199                                 }
1200                         }
1201                 } elseif ( $action == 'create' ) {
1202                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1203                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1204                         {
1205                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1206                         }
1207                 } elseif( $action == 'move-target' ) {
1208                         if( !$user->isAllowed( 'move' ) ) {
1209                                 // User can't move anything
1210                                 $errors[] = array ('movenotallowed');
1211                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1212                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1213                         {
1214                                 // Show user page-specific message only if the user can move other pages
1215                                 $errors[] = array( 'cant-move-to-user-page' );
1216                         }
1217                 } elseif( !$user->isAllowed( $action ) ) {
1218                         $return = null;
1219
1220                         // We avoid expensive display logic for quickUserCan's and such
1221                         $groups = false;
1222                         if (!$short) {
1223                                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1224                                         User::getGroupsWithPermission( $action ) );
1225                         }
1226
1227                         if( $groups ) {
1228                                 $return = array( 'badaccess-groups',
1229                                         array( implode( ', ', $groups ), count( $groups ) ) );
1230                         } else {
1231                                 $return = array( "badaccess-group0" );
1232                         }
1233                         $errors[] = $return;
1234                 }
1235
1236                 # Short-circuit point
1237                 if( $short && count($errors) > 0 ) {
1238                         wfProfileOut( __METHOD__ );
1239                         return $errors;
1240                 }
1241
1242                 // Use getUserPermissionsErrors instead
1243                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1244                         wfProfileOut( __METHOD__ );
1245                         return $result ? array() : array( array( 'badaccess-group0' ) );
1246                 }
1247                 // Check getUserPermissionsErrors hook
1248                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1249                         if( is_array($result) && count($result) && !is_array($result[0]) )
1250                                 $errors[] = $result; # A single array representing an error
1251                         else if( is_array($result) && is_array($result[0]) )
1252                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1253                         else if( $result !== '' && is_string($result) )
1254                                 $errors[] = array($result); # A string representing a message-id
1255                         else if( $result === false )
1256                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1257                 }
1258                 # Short-circuit point
1259                 if( $short && count($errors) > 0 ) {
1260                         wfProfileOut( __METHOD__ );
1261                         return $errors;
1262                 }
1263                 // Check getUserPermissionsErrorsExpensive hook
1264                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1265                         if( is_array($result) && count($result) && !is_array($result[0]) )
1266                                 $errors[] = $result; # A single array representing an error
1267                         else if( is_array($result) && is_array($result[0]) )
1268                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1269                         else if( $result !== '' && is_string($result) )
1270                                 $errors[] = array($result); # A string representing a message-id
1271                         else if( $result === false )
1272                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1273                 }
1274                 # Short-circuit point
1275                 if( $short && count($errors) > 0 ) {
1276                         wfProfileOut( __METHOD__ );
1277                         return $errors;
1278                 }
1279
1280                 # Only 'createaccount' and 'execute' can be performed on
1281                 # special pages, which don't actually exist in the DB.
1282                 $specialOKActions = array( 'createaccount', 'execute' );
1283                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1284                         $errors[] = array('ns-specialprotected');
1285                 }
1286
1287                 # Check $wgNamespaceProtection for restricted namespaces
1288                 if( $this->isNamespaceProtected() ) {
1289                         $ns = $this->getNamespace() == NS_MAIN ?
1290                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1291                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1292                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1293                 }
1294
1295                 # Protect css/js subpages of user pages
1296                 # XXX: this might be better using restrictions
1297                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssSubpage()
1298                 #      and $this->userCanEditJsSubpage() from working
1299                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1300                 if( $this->isCssSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('editusercss') )
1301                         && $action != 'patrol'
1302                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1303                 {
1304                         $errors[] = array('customcssjsprotected');
1305                 } else if( $this->isJsSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('edituserjs') )
1306                         && $action != 'patrol'
1307                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1308                 {
1309                         $errors[] = array('customcssjsprotected');
1310                 }
1311
1312                 # Check against page_restrictions table requirements on this
1313                 # page. The user must possess all required rights for this action.
1314                 foreach( $this->getRestrictions($action) as $right ) {
1315                         // Backwards compatibility, rewrite sysop -> protect
1316                         if( $right == 'sysop' ) {
1317                                 $right = 'protect';
1318                         }
1319                         if( $right != '' && !$user->isAllowed( $right ) ) {
1320                                 // Users with 'editprotected' permission can edit protected pages
1321                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1322                                         // Users with 'editprotected' permission cannot edit protected pages
1323                                         // with cascading option turned on.
1324                                         if( $this->mCascadeRestriction ) {
1325                                                 $errors[] = array( 'protectedpagetext', $right );
1326                                         }
1327                                 } else {
1328                                         $errors[] = array( 'protectedpagetext', $right );
1329                                 }
1330                         }
1331                 }
1332                 # Short-circuit point
1333                 if( $short && count($errors) > 0 ) {
1334                         wfProfileOut( __METHOD__ );
1335                         return $errors;
1336                 }
1337
1338                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1339                         # We /could/ use the protection level on the source page, but it's fairly ugly
1340                         #  as we have to establish a precedence hierarchy for pages included by multiple
1341                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1342                         #  as they could remove the protection anyway.
1343                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1344                         # Cascading protection depends on more than this page...
1345                         # Several cascading protected pages may include this page...
1346                         # Check each cascading level
1347                         # This is only for protection restrictions, not for all actions
1348                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1349                                 foreach( $restrictions[$action] as $right ) {
1350                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1351                                         if( $right != '' && !$user->isAllowed( $right ) ) {
1352                                                 $pages = '';
1353                                                 foreach( $cascadingSources as $page )
1354                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1355                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1356                                         }
1357                                 }
1358                         }
1359                 }
1360                 # Short-circuit point
1361                 if( $short && count($errors) > 0 ) {
1362                         wfProfileOut( __METHOD__ );
1363                         return $errors;
1364                 }
1365
1366                 if( $action == 'protect' ) {
1367                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1368                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1369                         }
1370                 }
1371
1372                 if( $action == 'create' ) {
1373                         $title_protection = $this->getTitleProtection();
1374                         if( is_array($title_protection) ) {
1375                                 extract($title_protection); // is this extract() really needed?
1376
1377                                 if( $pt_create_perm == 'sysop' ) {
1378                                         $pt_create_perm = 'protect'; // B/C
1379                                 }
1380                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1381                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1382                                 }
1383                         }
1384                 } elseif( $action == 'move' ) {
1385                         // Check for immobile pages
1386                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1387                                 // Specific message for this case
1388                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1389                         } elseif( !$this->isMovable() ) {
1390                                 // Less specific message for rarer cases
1391                                 $errors[] = array( 'immobile-page' );
1392                         }
1393                 } elseif( $action == 'move-target' ) {
1394                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1395                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1396                         } elseif( !$this->isMovable() ) {
1397                                 $errors[] = array( 'immobile-target-page' );
1398                         }
1399                 }
1400
1401                 wfProfileOut( __METHOD__ );
1402                 return $errors;
1403         }
1404
1405         /**
1406          * Is this title subject to title protection?
1407          * @return \type{\mixed} An associative array representing any existent title
1408          *   protection, or false if there's none.
1409          */
1410         private function getTitleProtection() {
1411                 // Can't protect pages in special namespaces
1412                 if ( $this->getNamespace() < 0 ) {
1413                         return false;
1414                 }
1415
1416                 // Can't protect pages that exist.
1417                 if ($this->exists()) {
1418                         return false;
1419                 }
1420
1421                 $dbr = wfGetDB( DB_SLAVE );
1422                 $res = $dbr->select( 'protected_titles', '*',
1423                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1424                         __METHOD__ );
1425
1426                 if ($row = $dbr->fetchRow( $res )) {
1427                         return $row;
1428                 } else {
1429                         return false;
1430                 }
1431         }
1432
1433         /**
1434          * Update the title protection status
1435          * @param $create_perm \type{\string} Permission required for creation
1436          * @param $reason \type{\string} Reason for protection
1437          * @param $expiry \type{\string} Expiry timestamp
1438          */
1439         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1440                 global $wgUser,$wgContLang;
1441
1442                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1443                         && $expiry == $this->mRestrictionsExpiry['create']) {
1444                         // No change
1445                         return true;
1446                 }
1447
1448                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1449
1450                 $dbw = wfGetDB( DB_MASTER );
1451
1452                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1453
1454                 $expiry_description = '';
1455                 if ( $encodedExpiry != 'infinity' ) {
1456                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',$wgContLang->timeanddate( $expiry ),
1457                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1458                 }
1459                 else {
1460                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1461                 }
1462
1463                 # Update protection table
1464                 if ($create_perm != '' ) {
1465                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1466                                 array(
1467                                         'pt_namespace' => $namespace,
1468                                         'pt_title' => $title,
1469                                         'pt_create_perm' => $create_perm,
1470                                         'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw),
1471                                         'pt_expiry' => $encodedExpiry,
1472                                         'pt_user' => $wgUser->getId(),
1473                                         'pt_reason' => $reason,
1474                                 ), __METHOD__
1475                         );
1476                 } else {
1477                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1478                                 'pt_title' => $title ), __METHOD__ );
1479                 }
1480                 # Update the protection log
1481                 if( $dbw->affectedRows() ) {
1482                         $log = new LogPage( 'protect' );
1483
1484                         if( $create_perm ) {
1485                                 $params = array("[create=$create_perm] $expiry_description",'');
1486                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
1487                         } else {
1488                                 $log->addEntry( 'unprotect', $this, $reason );
1489                         }
1490                 }
1491
1492                 return true;
1493         }
1494
1495         /**
1496          * Remove any title protection due to page existing
1497          */
1498         public function deleteTitleProtection() {
1499                 $dbw = wfGetDB( DB_MASTER );
1500
1501                 $dbw->delete( 'protected_titles',
1502                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1503                         __METHOD__ );
1504         }
1505
1506         /**
1507          * Would anybody with sufficient privileges be able to move this page?
1508          * Some pages just aren't movable.
1509          *
1510          * @return \type{\bool} TRUE or FALSE
1511          */
1512         public function isMovable() {
1513                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1514         }
1515
1516         /**
1517          * Can $wgUser read this page?
1518          * @return \type{\bool} TRUE or FALSE
1519          * @todo fold these checks into userCan()
1520          */
1521         public function userCanRead() {
1522                 global $wgUser, $wgGroupPermissions;
1523
1524                 static $useShortcut = null;
1525
1526                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1527                 if( is_null( $useShortcut ) ) {
1528                         global $wgRevokePermissions;
1529                         $useShortcut = true;
1530                         if( empty( $wgGroupPermissions['*']['read'] ) ) {
1531                                 # Not a public wiki, so no shortcut
1532                                 $useShortcut = false;
1533                         } elseif( !empty( $wgRevokePermissions ) ) {
1534                                 /*
1535                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1536                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1537                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1538                                  * reading is allowed.
1539                                  */
1540                                 foreach( $wgRevokePermissions as $perms ) {
1541                                         if( !empty( $perms['read'] ) ) {
1542                                                 # We might be removing the read right from the user, so no shortcut
1543                                                 $useShortcut = false;
1544                                                 break;
1545                                         }
1546                                 }
1547                         }
1548                 }
1549
1550                 $result = null;
1551                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1552                 if ( $result !== null ) {
1553                         return $result;
1554                 }
1555
1556                 # Shortcut for public wikis, allows skipping quite a bit of code
1557                 if ( $useShortcut )
1558                         return true;
1559
1560                 if( $wgUser->isAllowed( 'read' ) ) {
1561                         return true;
1562                 } else {
1563                         global $wgWhitelistRead;
1564
1565                         /**
1566                          * Always grant access to the login page.
1567                          * Even anons need to be able to log in.
1568                         */
1569                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1570                                 return true;
1571                         }
1572
1573                         /**
1574                          * Bail out if there isn't whitelist
1575                          */
1576                         if( !is_array($wgWhitelistRead) ) {
1577                                 return false;
1578                         }
1579
1580                         /**
1581                          * Check for explicit whitelisting
1582                          */
1583                         $name = $this->getPrefixedText();
1584                         $dbName = $this->getPrefixedDBKey();
1585                         // Check with and without underscores
1586                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1587                                 return true;
1588
1589                         /**
1590                          * Old settings might have the title prefixed with
1591                          * a colon for main-namespace pages
1592                          */
1593                         if( $this->getNamespace() == NS_MAIN ) {
1594                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1595                                         return true;
1596                         }
1597
1598                         /**
1599                          * If it's a special page, ditch the subpage bit
1600                          * and check again
1601                          */
1602                         if( $this->getNamespace() == NS_SPECIAL ) {
1603                                 $name = $this->getDBkey();
1604                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1605                                 if ( $name === false ) {
1606                                         # Invalid special page, but we show standard login required message
1607                                         return false;
1608                                 }
1609
1610                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1611                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1612                                         return true;
1613                         }
1614
1615                 }
1616                 return false;
1617         }
1618
1619         /**
1620          * Is this a talk page of some sort?
1621          * @return \type{\bool} TRUE or FALSE
1622          */
1623         public function isTalkPage() {
1624                 return MWNamespace::isTalk( $this->getNamespace() );
1625         }
1626
1627         /**
1628          * Is this a subpage?
1629          * @return \type{\bool} TRUE or FALSE
1630          */
1631         public function isSubpage() {
1632                 return MWNamespace::hasSubpages( $this->mNamespace )
1633                         ? strpos( $this->getText(), '/' ) !== false
1634                         : false;
1635         }
1636
1637         /**
1638          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1639          * @return \type{\bool} TRUE or FALSE
1640          */
1641         public function hasSubpages() {
1642                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1643                         # Duh
1644                         return false;
1645                 }
1646
1647                 # We dynamically add a member variable for the purpose of this method
1648                 # alone to cache the result.  There's no point in having it hanging
1649                 # around uninitialized in every Title object; therefore we only add it
1650                 # if needed and don't declare it statically.
1651                 if( isset( $this->mHasSubpages ) ) {
1652                         return $this->mHasSubpages;
1653                 }
1654
1655                 $subpages = $this->getSubpages( 1 );
1656                 if( $subpages instanceof TitleArray )
1657                         return $this->mHasSubpages = (bool)$subpages->count();
1658                 return $this->mHasSubpages = false;
1659         }
1660
1661         /**
1662          * Get all subpages of this page.
1663          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1664          * @return mixed TitleArray, or empty array if this page's namespace
1665          *  doesn't allow subpages
1666          */
1667         public function getSubpages( $limit = -1 ) {
1668                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1669                         return array();
1670
1671                 $dbr = wfGetDB( DB_SLAVE );
1672                 $conds['page_namespace'] = $this->getNamespace();
1673                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
1674                 $options = array();
1675                 if( $limit > -1 )
1676                         $options['LIMIT'] = $limit;
1677                 return $this->mSubpages = TitleArray::newFromResult(
1678                         $dbr->select( 'page',
1679                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1680                                 $conds,
1681                                 __METHOD__,
1682                                 $options
1683                         )
1684                 );
1685         }
1686
1687         /**
1688          * Could this page contain custom CSS or JavaScript, based
1689          * on the title?
1690          *
1691          * @return \type{\bool} TRUE or FALSE
1692          */
1693         public function isCssOrJsPage() {
1694                 return $this->mNamespace == NS_MEDIAWIKI
1695                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1696         }
1697
1698         /**
1699          * Is this a .css or .js subpage of a user page?
1700          * @return \type{\bool} TRUE or FALSE
1701          */
1702         public function isCssJsSubpage() {
1703                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1704         }
1705         /**
1706          * Is this a *valid* .css or .js subpage of a user page?
1707          * Check that the corresponding skin exists
1708          * @return \type{\bool} TRUE or FALSE
1709          */
1710         public function isValidCssJsSubpage() {
1711                 if ( $this->isCssJsSubpage() ) {
1712                         $name = $this->getSkinFromCssJsSubpage();
1713                         if ( $name == 'common' ) return true;
1714                         $skinNames = Skin::getSkinNames();
1715                         return array_key_exists( $name, $skinNames );
1716                 } else {
1717                         return false;
1718                 }
1719         }
1720         /**
1721          * Trim down a .css or .js subpage title to get the corresponding skin name
1722          */
1723         public function getSkinFromCssJsSubpage() {
1724                 $subpage = explode( '/', $this->mTextform );
1725                 $subpage = $subpage[ count( $subpage ) - 1 ];
1726                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1727         }
1728         /**
1729          * Is this a .css subpage of a user page?
1730          * @return \type{\bool} TRUE or FALSE
1731          */
1732         public function isCssSubpage() {
1733                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1734         }
1735         /**
1736          * Is this a .js subpage of a user page?
1737          * @return \type{\bool} TRUE or FALSE
1738          */
1739         public function isJsSubpage() {
1740                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1741         }
1742         /**
1743          * Protect css subpages of user pages: can $wgUser edit
1744          * this page?
1745          *
1746          * @return \type{\bool} TRUE or FALSE
1747          * @todo XXX: this might be better using restrictions
1748          */
1749         public function userCanEditCssSubpage() {
1750                 global $wgUser;
1751                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('editusercss') )
1752                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1753         }
1754         /**
1755          * Protect js subpages of user pages: can $wgUser edit
1756          * this page?
1757          *
1758          * @return \type{\bool} TRUE or FALSE
1759          * @todo XXX: this might be better using restrictions
1760          */
1761         public function userCanEditJsSubpage() {
1762                 global $wgUser;
1763                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('edituserjs') )
1764                        || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1765         }
1766
1767         /**
1768          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1769          *
1770          * @return \type{\bool} If the page is subject to cascading restrictions.
1771          */
1772         public function isCascadeProtected() {
1773                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1774                 return ( $sources > 0 );
1775         }
1776
1777         /**
1778          * Cascading protection: Get the source of any cascading restrictions on this page.
1779          *
1780          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1781          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1782          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1783          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1784          */
1785         public function getCascadeProtectionSources( $get_pages = true ) {
1786                 $pagerestrictions = array();
1787
1788                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1789                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1790                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1791                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1792                 }
1793
1794                 wfProfileIn( __METHOD__ );
1795
1796                 $dbr = wfGetDB( DB_SLAVE );
1797
1798                 if ( $this->getNamespace() == NS_FILE ) {
1799                         $tables = array ('imagelinks', 'page_restrictions');
1800                         $where_clauses = array(
1801                                 'il_to' => $this->getDBkey(),
1802                                 'il_from=pr_page',
1803                                 'pr_cascade' => 1 );
1804                 } else {
1805                         $tables = array ('templatelinks', 'page_restrictions');
1806                         $where_clauses = array(
1807                                 'tl_namespace' => $this->getNamespace(),
1808                                 'tl_title' => $this->getDBkey(),
1809                                 'tl_from=pr_page',
1810                                 'pr_cascade' => 1 );
1811                 }
1812
1813                 if ( $get_pages ) {
1814                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1815                         $where_clauses[] = 'page_id=pr_page';
1816                         $tables[] = 'page';
1817                 } else {
1818                         $cols = array( 'pr_expiry' );
1819                 }
1820
1821                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1822
1823                 $sources = $get_pages ? array() : false;
1824                 $now = wfTimestampNow();
1825                 $purgeExpired = false;
1826
1827                 foreach( $res as $row ) {
1828                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1829                         if( $expiry > $now ) {
1830                                 if ($get_pages) {
1831                                         $page_id = $row->pr_page;
1832                                         $page_ns = $row->page_namespace;
1833                                         $page_title = $row->page_title;
1834                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1835                                         # Add groups needed for each restriction type if its not already there
1836                                         # Make sure this restriction type still exists
1837
1838                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
1839                                                 $pagerestrictions[$row->pr_type] = array();
1840                                         }
1841
1842                                         if ( isset($pagerestrictions[$row->pr_type]) &&
1843                                                         !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1844                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1845                                         }
1846                                 } else {
1847                                         $sources = true;
1848                                 }
1849                         } else {
1850                                 // Trigger lazy purge of expired restrictions from the db
1851                                 $purgeExpired = true;
1852                         }
1853                 }
1854                 if( $purgeExpired ) {
1855                         Title::purgeExpiredRestrictions();
1856                 }
1857
1858                 wfProfileOut( __METHOD__ );
1859
1860                 if ( $get_pages ) {
1861                         $this->mCascadeSources = $sources;
1862                         $this->mCascadingRestrictions = $pagerestrictions;
1863                 } else {
1864                         $this->mHasCascadingRestrictions = $sources;
1865                 }
1866                 return array( $sources, $pagerestrictions );
1867         }
1868
1869         function areRestrictionsCascading() {
1870                 if (!$this->mRestrictionsLoaded) {
1871                         $this->loadRestrictions();
1872                 }
1873
1874                 return $this->mCascadeRestriction;
1875         }
1876
1877         /**
1878          * Loads a string into mRestrictions array
1879          * @param $res \type{Resource} restrictions as an SQL result.
1880          */
1881         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
1882                 $rows = array();
1883                 $dbr = wfGetDB( DB_SLAVE );
1884
1885                 while( $row = $dbr->fetchObject( $res ) ) {
1886                         $rows[] = $row;
1887                 }
1888
1889                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
1890         }
1891
1892         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
1893                 $dbr = wfGetDB( DB_SLAVE );
1894
1895                 $restrictionTypes = $this->getRestrictionTypes();
1896
1897                 foreach( $restrictionTypes as $type ){
1898                         $this->mRestrictions[$type] = array();
1899                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1900                 }
1901
1902                 $this->mCascadeRestriction = false;
1903
1904                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1905
1906                 if ( $oldFashionedRestrictions === null ) {
1907                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1908                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1909                 }
1910
1911                 if ($oldFashionedRestrictions != '') {
1912
1913                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1914                                 $temp = explode( '=', trim( $restrict ) );
1915                                 if(count($temp) == 1) {
1916                                         // old old format should be treated as edit/move restriction
1917                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1918                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1919                                 } else {
1920                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1921                                 }
1922                         }
1923
1924                         $this->mOldRestrictions = true;
1925
1926                 }
1927
1928                 if( count($rows) ) {
1929                         # Current system - load second to make them override.
1930                         $now = wfTimestampNow();
1931                         $purgeExpired = false;
1932
1933                         foreach( $rows as $row ) {
1934                                 # Cycle through all the restrictions.
1935
1936                                 // Don't take care of restrictions types that aren't allowed
1937
1938                                 if( !in_array( $row->pr_type, $restrictionTypes ) )
1939                                         continue;
1940
1941                                 // This code should be refactored, now that it's being used more generally,
1942                                 // But I don't really see any harm in leaving it in Block for now -werdna
1943                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1944
1945                                 // Only apply the restrictions if they haven't expired!
1946                                 if ( !$expiry || $expiry > $now ) {
1947                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1948                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1949
1950                                         $this->mCascadeRestriction |= $row->pr_cascade;
1951                                 } else {
1952                                         // Trigger a lazy purge of expired restrictions
1953                                         $purgeExpired = true;
1954                                 }
1955                         }
1956
1957                         if( $purgeExpired ) {
1958                                 Title::purgeExpiredRestrictions();
1959                         }
1960                 }
1961
1962                 $this->mRestrictionsLoaded = true;
1963         }
1964
1965         /**
1966          * Load restrictions from the page_restrictions table
1967          */
1968         public function loadRestrictions( $oldFashionedRestrictions = null ) {
1969                 if( !$this->mRestrictionsLoaded ) {
1970                         if ($this->exists()) {
1971                                 $dbr = wfGetDB( DB_SLAVE );
1972
1973                                 $res = $dbr->select( 'page_restrictions', '*',
1974                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1975
1976                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
1977                         } else {
1978                                 $title_protection = $this->getTitleProtection();
1979
1980                                 if (is_array($title_protection)) {
1981                                         extract($title_protection);
1982
1983                                         $now = wfTimestampNow();
1984                                         $expiry = Block::decodeExpiry($pt_expiry);
1985
1986                                         if (!$expiry || $expiry > $now) {
1987                                                 // Apply the restrictions
1988                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1989                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1990                                         } else { // Get rid of the old restrictions
1991                                                 Title::purgeExpiredRestrictions();
1992                                         }
1993                                 } else {
1994                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1995                                 }
1996                                 $this->mRestrictionsLoaded = true;
1997                         }
1998                 }
1999         }
2000
2001         /**
2002          * Purge expired restrictions from the page_restrictions table
2003          */
2004         static function purgeExpiredRestrictions() {
2005                 $dbw = wfGetDB( DB_MASTER );
2006                 $dbw->delete( 'page_restrictions',
2007                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2008                         __METHOD__ );
2009
2010                 $dbw->delete( 'protected_titles',
2011                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2012                         __METHOD__ );
2013         }
2014
2015         /**
2016          * Accessor/initialisation for mRestrictions
2017          *
2018          * @param $action \type{\string} action that permission needs to be checked for
2019          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
2020          */
2021         public function getRestrictions( $action ) {
2022                 if( !$this->mRestrictionsLoaded ) {
2023                         $this->loadRestrictions();
2024                 }
2025                 return isset( $this->mRestrictions[$action] )
2026                                 ? $this->mRestrictions[$action]
2027                                 : array();
2028         }
2029
2030         /**
2031          * Get the expiry time for the restriction against a given action
2032          * @return 14-char timestamp, or 'infinity' if the page is protected forever
2033          * or not protected at all, or false if the action is not recognised.
2034          */
2035         public function getRestrictionExpiry( $action ) {
2036                 if( !$this->mRestrictionsLoaded ) {
2037                         $this->loadRestrictions();
2038                 }
2039                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2040         }
2041
2042         /**
2043          * Is there a version of this page in the deletion archive?
2044          * @return \type{\int} the number of archived revisions
2045          */
2046         public function isDeleted() {
2047                 if( $this->getNamespace() < 0 ) {
2048                         $n = 0;
2049                 } else {
2050                         $dbr = wfGetDB( DB_SLAVE );
2051                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2052                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2053                                 __METHOD__
2054                         );
2055                         if( $this->getNamespace() == NS_FILE ) {
2056                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2057                                         array( 'fa_name' => $this->getDBkey() ),
2058                                         __METHOD__
2059                                 );
2060                         }
2061                 }
2062                 return (int)$n;
2063         }
2064
2065         /**
2066          * Is there a version of this page in the deletion archive?
2067          * @return bool
2068          */
2069         public function isDeletedQuick() {
2070                 if( $this->getNamespace() < 0 ) {
2071                         return false;
2072                 }
2073                 $dbr = wfGetDB( DB_SLAVE );
2074                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2075                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2076                         __METHOD__
2077                 );
2078                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
2079                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2080                                 array( 'fa_name' => $this->getDBkey() ),
2081                                 __METHOD__
2082                         );
2083                 }
2084                 return $deleted;
2085         }
2086
2087         /**
2088          * Get the article ID for this Title from the link cache,
2089          * adding it if necessary
2090          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2091          *  for update
2092          * @return \type{\int} the ID
2093          */
2094         public function getArticleID( $flags = 0 ) {
2095                 if( $this->getNamespace() < 0 ) {
2096                         return $this->mArticleID = 0;
2097                 }
2098                 $linkCache = LinkCache::singleton();
2099                 if( $flags & GAID_FOR_UPDATE ) {
2100                         $oldUpdate = $linkCache->forUpdate( true );
2101                         $linkCache->clearLink( $this );
2102                         $this->mArticleID = $linkCache->addLinkObj( $this );
2103                         $linkCache->forUpdate( $oldUpdate );
2104                 } else {
2105                         if( -1 == $this->mArticleID ) {
2106                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2107                         }
2108                 }
2109                 return $this->mArticleID;
2110         }
2111
2112         /**
2113          * Is this an article that is a redirect page?
2114          * Uses link cache, adding it if necessary
2115          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2116          * @return \type{\bool}
2117          */
2118         public function isRedirect( $flags = 0 ) {
2119                 if( !is_null($this->mRedirect) )
2120                         return $this->mRedirect;
2121                 # Calling getArticleID() loads the field from cache as needed
2122                 if( !$this->getArticleID($flags) ) {
2123                         return $this->mRedirect = false;
2124                 }
2125                 $linkCache = LinkCache::singleton();
2126                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2127
2128                 return $this->mRedirect;
2129         }
2130
2131         /**
2132          * What is the length of this page?
2133          * Uses link cache, adding it if necessary
2134          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2135          * @return \type{\bool}
2136          */
2137         public function getLength( $flags = 0 ) {
2138                 if( $this->mLength != -1 )
2139                         return $this->mLength;
2140                 # Calling getArticleID() loads the field from cache as needed
2141                 if( !$this->getArticleID($flags) ) {
2142                         return $this->mLength = 0;
2143                 }
2144                 $linkCache = LinkCache::singleton();
2145                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2146
2147                 return $this->mLength;
2148         }
2149
2150         /**
2151          * What is the page_latest field for this page?
2152          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2153          * @return \type{\int} or false if the page doesn't exist
2154          */
2155         public function getLatestRevID( $flags = 0 ) {
2156                 if( $this->mLatestID !== false )
2157                         return $this->mLatestID;
2158
2159                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2160                 $this->mLatestID = (int)$db->selectField(
2161                         'page', 'page_latest', $this->pageCond(), __METHOD__ );
2162                 return $this->mLatestID;
2163         }
2164
2165         /**
2166          * This clears some fields in this object, and clears any associated
2167          * keys in the "bad links" section of the link cache.
2168          *
2169          * - This is called from Article::insertNewArticle() to allow
2170          * loading of the new page_id. It's also called from
2171          * Article::doDeleteArticle()
2172          *
2173          * @param $newid \type{\int} the new Article ID
2174          */
2175         public function resetArticleID( $newid ) {
2176                 $linkCache = LinkCache::singleton();
2177                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2178
2179                 if ( $newid === false ) { $this->mArticleID = -1; }
2180                 else { $this->mArticleID = intval( $newid ); }
2181                 $this->mRestrictionsLoaded = false;
2182                 $this->mRestrictions = array();
2183         }
2184
2185         /**
2186          * Updates page_touched for this page; called from LinksUpdate.php
2187          * @return \type{\bool} true if the update succeded
2188          */
2189         public function invalidateCache() {
2190                 if( wfReadOnly() ) {
2191                         return;
2192                 }
2193                 $dbw = wfGetDB( DB_MASTER );
2194                 $success = $dbw->update( 'page',
2195                         array( 'page_touched' => $dbw->timestamp() ),
2196                         $this->pageCond(),
2197                         __METHOD__
2198                 );
2199                 HTMLFileCache::clearFileCache( $this );
2200                 return $success;
2201         }
2202
2203         /**
2204          * Prefix some arbitrary text with the namespace or interwiki prefix
2205          * of this object
2206          *
2207          * @param $name \type{\string} the text
2208          * @return \type{\string} the prefixed text
2209          * @private
2210          */
2211         /* private */ function prefix( $name ) {
2212                 $p = '';
2213                 if ( $this->mInterwiki != '' ) {
2214                         $p = $this->mInterwiki . ':';
2215                 }
2216                 if ( 0 != $this->mNamespace ) {
2217                         $p .= $this->getNsText() . ':';
2218                 }
2219                 return $p . $name;
2220         }
2221
2222         // Returns a simple regex that will match on characters and sequences invalid in titles.
2223         //  Note that this doesn't pick up many things that could be wrong with titles, but that
2224         //  replacing this regex with something valid will make many titles valid.
2225         static function getTitleInvalidRegex() {
2226                 static $rxTc = false;
2227                 if( !$rxTc ) {
2228                         # Matching titles will be held as illegal.
2229                         $rxTc = '/' .
2230                                 # Any character not allowed is forbidden...
2231                                 '[^' . Title::legalChars() . ']' .
2232                                 # URL percent encoding sequences interfere with the ability
2233                                 # to round-trip titles -- you can't link to them consistently.
2234                                 '|%[0-9A-Fa-f]{2}' .
2235                                 # XML/HTML character references produce similar issues.
2236                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2237                                 '|&#[0-9]+;' .
2238                                 '|&#x[0-9A-Fa-f]+;' .
2239                                 '/S';
2240                 }
2241
2242                 return $rxTc;
2243         }
2244
2245         /**
2246          * Capitalize a text if it belongs to a namespace that capitalizes
2247          */
2248         public static function capitalize( $text, $ns = NS_MAIN ) {
2249                 global $wgContLang;
2250
2251                 if ( MWNamespace::isCapitalized( $ns ) )
2252                         return $wgContLang->ucfirst( $text );
2253                 else
2254                         return $text;
2255         }
2256
2257         /**
2258          * Secure and split - main initialisation function for this object
2259          *
2260          * Assumes that mDbkeyform has been set, and is urldecoded
2261          * and uses underscores, but not otherwise munged.  This function
2262          * removes illegal characters, splits off the interwiki and
2263          * namespace prefixes, sets the other forms, and canonicalizes
2264          * everything.
2265          * @return \type{\bool} true on success
2266          */
2267         private function secureAndSplit() {
2268                 global $wgContLang, $wgLocalInterwiki;
2269
2270                 # Initialisation
2271                 $rxTc = self::getTitleInvalidRegex();
2272
2273                 $this->mInterwiki = $this->mFragment = '';
2274                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2275
2276                 $dbkey = $this->mDbkeyform;
2277
2278                 # Strip Unicode bidi override characters.
2279                 # Sometimes they slip into cut-n-pasted page titles, where the
2280                 # override chars get included in list displays.
2281                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2282
2283                 # Clean up whitespace
2284                 # Note: use of the /u option on preg_replace here will cause
2285                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2286                 # conveniently disabling them.
2287                 #
2288                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2289                 $dbkey = trim( $dbkey, '_' );
2290
2291                 if ( $dbkey == '' ) {
2292                         return false;
2293                 }
2294
2295                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2296                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2297                         return false;
2298                 }
2299
2300                 $this->mDbkeyform = $dbkey;
2301
2302                 # Initial colon indicates main namespace rather than specified default
2303                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2304                 if ( ':' == $dbkey{0} ) {
2305                         $this->mNamespace = NS_MAIN;
2306                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2307                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2308                 }
2309
2310                 # Namespace or interwiki prefix
2311                 $firstPass = true;
2312                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2313                 do {
2314                         $m = array();
2315                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2316                                 $p = $m[1];
2317                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2318                                         # Ordinary namespace
2319                                         $dbkey = $m[2];
2320                                         $this->mNamespace = $ns;
2321                                         # For Talk:X pages, check if X has a "namespace" prefix
2322                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2323                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2324                                                         return false; # Disallow Talk:File:x type titles...
2325                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2326                                                         return false; # Disallow Talk:Interwiki:x type titles...
2327                                         }
2328                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2329                                         if( !$firstPass ) {
2330                                                 # Can't make a local interwiki link to an interwiki link.
2331                                                 # That's just crazy!
2332                                                 return false;
2333                                         }
2334
2335                                         # Interwiki link
2336                                         $dbkey = $m[2];
2337                                         $this->mInterwiki = $wgContLang->lc( $p );
2338
2339                                         # Redundant interwiki prefix to the local wiki
2340                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2341                                                 if( $dbkey == '' ) {
2342                                                         # Can't have an empty self-link
2343                                                         return false;
2344                                                 }
2345                                                 $this->mInterwiki = '';
2346                                                 $firstPass = false;
2347                                                 # Do another namespace split...
2348                                                 continue;
2349                                         }
2350
2351                                         # If there's an initial colon after the interwiki, that also
2352                                         # resets the default namespace
2353                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2354                                                 $this->mNamespace = NS_MAIN;
2355                                                 $dbkey = substr( $dbkey, 1 );
2356                                         }
2357                                 }
2358                                 # If there's no recognized interwiki or namespace,
2359                                 # then let the colon expression be part of the title.
2360                         }
2361                         break;
2362                 } while( true );
2363
2364                 # We already know that some pages won't be in the database!
2365                 #
2366                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
2367                         $this->mArticleID = 0;
2368                 }
2369                 $fragment = strstr( $dbkey, '#' );
2370                 if ( false !== $fragment ) {
2371                         $this->setFragment( $fragment );
2372                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2373                         # remove whitespace again: prevents "Foo_bar_#"
2374                         # becoming "Foo_bar_"
2375                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2376                 }
2377
2378                 # Reject illegal characters.
2379                 #
2380                 if( preg_match( $rxTc, $dbkey ) ) {
2381                         return false;
2382                 }
2383
2384                 /**
2385                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2386                  * reachable due to the way web browsers deal with 'relative' URLs.
2387                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2388                  */
2389                 if ( strpos( $dbkey, '.' ) !== false &&
2390                      ( $dbkey === '.' || $dbkey === '..' ||
2391                        strpos( $dbkey, './' ) === 0  ||
2392                        strpos( $dbkey, '../' ) === 0 ||
2393                        strpos( $dbkey, '/./' ) !== false ||
2394                        strpos( $dbkey, '/../' ) !== false  ||
2395                        substr( $dbkey, -2 ) == '/.' ||
2396                        substr( $dbkey, -3 ) == '/..' ) )
2397                 {
2398                         return false;
2399                 }
2400
2401                 /**
2402                  * Magic tilde sequences? Nu-uh!
2403                  */
2404                 if( strpos( $dbkey, '~~~' ) !== false ) {
2405                         return false;
2406                 }
2407
2408                 /**
2409                  * Limit the size of titles to 255 bytes.
2410                  * This is typically the size of the underlying database field.
2411                  * We make an exception for special pages, which don't need to be stored
2412                  * in the database, and may edge over 255 bytes due to subpage syntax
2413                  * for long titles, e.g. [[Special:Block/Long name]]
2414                  */
2415                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2416                   strlen( $dbkey ) > 512 )
2417                 {
2418                         return false;
2419                 }
2420
2421                 /**
2422                  * Normally, all wiki links are forced to have
2423                  * an initial capital letter so [[foo]] and [[Foo]]
2424                  * point to the same place.
2425                  *
2426                  * Don't force it for interwikis, since the other
2427                  * site might be case-sensitive.
2428                  */
2429                 $this->mUserCaseDBKey = $dbkey;
2430                 if(  $this->mInterwiki == '') {
2431                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
2432                 }
2433
2434                 /**
2435                  * Can't make a link to a namespace alone...
2436                  * "empty" local links can only be self-links
2437                  * with a fragment identifier.
2438                  */
2439                 if( $dbkey == '' &&
2440                         $this->mInterwiki == '' &&
2441                         $this->mNamespace != NS_MAIN ) {
2442                         return false;
2443                 }
2444                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2445                 // IP names are not allowed for accounts, and can only be referring to
2446                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2447                 // there are numerous ways to present the same IP. Having sp:contribs scan
2448                 // them all is silly and having some show the edits and others not is
2449                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2450                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2451                         IP::sanitizeIP( $dbkey ) : $dbkey;
2452                 // Any remaining initial :s are illegal.
2453                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2454                         return false;
2455                 }
2456
2457                 # Fill fields
2458                 $this->mDbkeyform = $dbkey;
2459                 $this->mUrlform = wfUrlencode( $dbkey );
2460
2461                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2462
2463                 return true;
2464         }
2465
2466         /**
2467          * Set the fragment for this title. Removes the first character from the
2468          * specified fragment before setting, so it assumes you're passing it with
2469          * an initial "#".
2470          *
2471          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2472          * Still in active use privately.
2473          *
2474          * @param $fragment \type{\string} text
2475          */
2476         public function setFragment( $fragment ) {
2477                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2478         }
2479
2480         /**
2481          * Get a Title object associated with the talk page of this article
2482          * @return \type{Title} the object for the talk page
2483          */
2484         public function getTalkPage() {
2485                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2486         }
2487
2488         /**
2489          * Get a title object associated with the subject page of this
2490          * talk page
2491          *
2492          * @return \type{Title} the object for the subject page
2493          */
2494         public function getSubjectPage() {
2495                 // Is this the same title?
2496                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2497                 if( $this->getNamespace() == $subjectNS ) {
2498                         return $this;
2499                 }
2500                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2501         }
2502
2503         /**
2504          * Get an array of Title objects linking to this Title
2505          * Also stores the IDs in the link cache.
2506          *
2507          * WARNING: do not use this function on arbitrary user-supplied titles!
2508          * On heavily-used templates it will max out the memory.
2509          *
2510          * @param array $options may be FOR UPDATE
2511          * @return \type{\arrayof{Title}} the Title objects linking here
2512          */
2513         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2514                 $linkCache = LinkCache::singleton();
2515
2516                 if ( count( $options ) > 0 ) {
2517                         $db = wfGetDB( DB_MASTER );
2518                 } else {
2519                         $db = wfGetDB( DB_SLAVE );
2520                 }
2521
2522                 $res = $db->select( array( 'page', $table ),
2523                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2524                         array(
2525                                 "{$prefix}_from=page_id",
2526                                 "{$prefix}_namespace" => $this->getNamespace(),
2527                                 "{$prefix}_title"     => $this->getDBkey() ),
2528                         __METHOD__,
2529                         $options );
2530
2531                 $retVal = array();
2532                 if ( $db->numRows( $res ) ) {
2533                         foreach( $res as $row ) {
2534                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2535                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2536                                         $retVal[] = $titleObj;
2537                                 }
2538                         }
2539                 }
2540                 $db->freeResult( $res );
2541                 return $retVal;
2542         }
2543
2544         /**
2545          * Get an array of Title objects using this Title as a template
2546          * Also stores the IDs in the link cache.
2547          *
2548          * WARNING: do not use this function on arbitrary user-supplied titles!
2549          * On heavily-used templates it will max out the memory.
2550          *
2551          * @param array $options may be FOR UPDATE
2552          * @return \type{\arrayof{Title}} the Title objects linking here
2553          */
2554         public function getTemplateLinksTo( $options = array() ) {
2555                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2556         }
2557
2558         /**
2559          * Get an array of Title objects referring to non-existent articles linked from this page
2560          *
2561          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2562          * @return \type{\arrayof{Title}} the Title objects
2563          */
2564         public function getBrokenLinksFrom() {
2565                 if ( $this->getArticleId() == 0 ) {
2566                         # All links from article ID 0 are false positives
2567                         return array();
2568                 }
2569
2570                 $dbr = wfGetDB( DB_SLAVE );
2571                 $res = $dbr->select(
2572                         array( 'page', 'pagelinks' ),
2573                         array( 'pl_namespace', 'pl_title' ),
2574                         array(
2575                                 'pl_from' => $this->getArticleId(),
2576                                 'page_namespace IS NULL'
2577                         ),
2578                         __METHOD__, array(),
2579                         array(
2580                                 'page' => array(
2581                                         'LEFT JOIN',
2582                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2583                                 )
2584                         )
2585                 );
2586
2587                 $retVal = array();
2588                 foreach( $res as $row ) {
2589                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2590                 }
2591                 return $retVal;
2592         }
2593
2594
2595         /**
2596          * Get a list of URLs to purge from the Squid cache when this
2597          * page changes
2598          *
2599          * @return \type{\arrayof{\string}} the URLs
2600          */
2601         public function getSquidURLs() {
2602                 global $wgContLang;
2603
2604                 $urls = array(
2605                         $this->getInternalURL(),
2606                         $this->getInternalURL( 'action=history' )
2607                 );
2608
2609                 // purge variant urls as well
2610                 if($wgContLang->hasVariants()){
2611                         $variants = $wgContLang->getVariants();
2612                         foreach($variants as $vCode){
2613                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2614                                 $urls[] = $this->getInternalURL('',$vCode);
2615                         }
2616                 }
2617
2618                 return $urls;
2619         }
2620
2621         /**
2622          * Purge all applicable Squid URLs
2623          */
2624         public function purgeSquid() {
2625                 global $wgUseSquid;
2626                 if ( $wgUseSquid ) {
2627                         $urls = $this->getSquidURLs();
2628                         $u = new SquidUpdate( $urls );
2629                         $u->doUpdate();
2630                 }
2631         }
2632
2633         /**
2634          * Move this page without authentication
2635          * @param &$nt \type{Title} the new page Title
2636          */
2637         public function moveNoAuth( &$nt ) {
2638                 return $this->moveTo( $nt, false );
2639         }
2640
2641         /**
2642          * Check whether a given move operation would be valid.
2643          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2644          * @param &$nt \type{Title} the new title
2645          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2646          *  should be checked
2647          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2648          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2649          */
2650         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2651                 global $wgUser;
2652
2653                 $errors = array();
2654                 if( !$nt ) {
2655                         // Normally we'd add this to $errors, but we'll get
2656                         // lots of syntax errors if $nt is not an object
2657                         return array(array('badtitletext'));
2658                 }
2659                 if( $this->equals( $nt ) ) {
2660                         $errors[] = array('selfmove');
2661                 }
2662                 if( !$this->isMovable() ) {
2663                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2664                 }
2665                 if ( $nt->getInterwiki() != '' ) {
2666                         $errors[] = array( 'immobile-target-namespace-iw' );
2667                 }
2668                 if ( !$nt->isMovable() ) {
2669                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2670                 }
2671
2672                 $oldid = $this->getArticleID();
2673                 $newid = $nt->getArticleID();
2674
2675                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2676                         $errors[] = array('articleexists');
2677                 }
2678                 if ( ( $this->getDBkey() == '' ) ||
2679                          ( !$oldid ) ||
2680                      ( $nt->getDBkey() == '' ) ) {
2681                         $errors[] = array('badarticleerror');
2682                 }
2683
2684                 // Image-specific checks
2685                 if( $this->getNamespace() == NS_FILE ) {
2686                         $file = wfLocalFile( $this );
2687                         if( $file->exists() ) {
2688                                 if( $nt->getNamespace() != NS_FILE ) {
2689                                         $errors[] = array('imagenocrossnamespace');
2690                                 }
2691                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2692                                         $errors[] = array('imageinvalidfilename');
2693                                 }
2694                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2695                                         $errors[] = array('imagetypemismatch');
2696                                 }
2697                         }
2698                         $destfile = wfLocalFile( $nt );
2699                         if( !$wgUser->isAllowed( 'reupload-shared' ) && !$destfile->exists() && wfFindFile( $nt ) ) {
2700                                 $errors[] = array( 'file-exists-sharedrepo' );
2701                         }
2702
2703                 }
2704
2705                 if ( $auth ) {
2706                         $errors = wfMergeErrorArrays( $errors,
2707                                 $this->getUserPermissionsErrors('move', $wgUser),
2708                                 $this->getUserPermissionsErrors('edit', $wgUser),
2709                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2710                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2711                 }
2712
2713                 $match = EditPage::matchSummarySpamRegex( $reason );
2714                 if( $match !== false ) {
2715                         // This is kind of lame, won't display nice
2716                         $errors[] = array('spamprotectiontext');
2717                 }
2718
2719                 $err = null;
2720                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2721                         $errors[] = array('hookaborted', $err);
2722                 }
2723
2724                 # The move is allowed only if (1) the target doesn't exist, or
2725                 # (2) the target is a redirect to the source, and has no history
2726                 # (so we can undo bad moves right after they're done).
2727
2728                 if ( 0 != $newid ) { # Target exists; check for validity
2729                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2730                                 $errors[] = array('articleexists');
2731                         }
2732                 } else {
2733                         $tp = $nt->getTitleProtection();
2734                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2735                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2736                                 $errors[] = array('cantmove-titleprotected');
2737                         }
2738                 }
2739                 if(empty($errors))
2740                         return true;
2741                 return $errors;
2742         }
2743
2744         /**
2745          * Move a title to a new location
2746          * @param &$nt \type{Title} the new title
2747          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2748          *  should be checked
2749          * @param $reason \type{\string} The reason for the move
2750          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2751          *  Ignored if the user doesn't have the suppressredirect right.
2752          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2753          */
2754         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2755                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2756                 if( is_array( $err ) ) {
2757                         return $err;
2758                 }
2759
2760                 // If it is a file, move it first. It is done before all other moving stuff is done because it's hard to revert
2761                 $dbw = wfGetDB( DB_MASTER );
2762                 if( $this->getNamespace() == NS_FILE ) {
2763                         $file = wfLocalFile( $this );
2764                         if( $file->exists() ) {
2765                                 $status = $file->move( $nt );
2766                                 if( !$status->isOk() ) {
2767                                         return $status->getErrorsArray();
2768                                 }
2769                         }
2770                 }
2771
2772                 $pageid = $this->getArticleID();
2773                 $protected = $this->isProtected();
2774                 if( $nt->exists() ) {
2775                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2776                         $pageCountChange = ($createRedirect ? 0 : -1);
2777                 } else { # Target didn't exist, do normal move.
2778                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2779                         $pageCountChange = ($createRedirect ? 1 : 0);
2780                 }
2781
2782                 if( is_array( $err ) ) {
2783                         return $err;
2784                 }
2785                 $redirid = $this->getArticleID();
2786
2787                 // Category memberships include a sort key which may be customized.
2788                 // If it's left as the default (the page title), we need to update
2789                 // the sort key to match the new title.
2790                 //
2791                 // Be careful to avoid resetting cl_timestamp, which may disturb
2792                 // time-based lists on some sites.
2793                 //
2794                 // Warning -- if the sort key is *explicitly* set to the old title,
2795                 // we can't actually distinguish it from a default here, and it'll
2796                 // be set to the new title even though it really shouldn't.
2797                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2798                 $dbw->update( 'categorylinks',
2799                         array(
2800                                 'cl_sortkey' => $nt->getPrefixedText(),
2801                                 'cl_timestamp=cl_timestamp' ),
2802                         array(
2803                                 'cl_from' => $pageid,
2804                                 'cl_sortkey' => $this->getPrefixedText() ),
2805                         __METHOD__ );
2806
2807                 if( $protected ) {
2808                         # Protect the redirect title as the title used to be...
2809                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2810                                 array(
2811                                         'pr_page'    => $redirid,
2812                                         'pr_type'    => 'pr_type',
2813                                         'pr_level'   => 'pr_level',
2814                                         'pr_cascade' => 'pr_cascade',
2815                                         'pr_user'    => 'pr_user',
2816                                         'pr_expiry'  => 'pr_expiry'
2817                                 ),
2818                                 array( 'pr_page' => $pageid ),
2819                                 __METHOD__,
2820                                 array( 'IGNORE' )
2821                         );
2822                         # Update the protection log
2823                         $log = new LogPage( 'protect' );
2824                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2825                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2826                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2827                 }
2828
2829                 # Update watchlists
2830                 $oldnamespace = $this->getNamespace() & ~1;
2831                 $newnamespace = $nt->getNamespace() & ~1;
2832                 $oldtitle = $this->getDBkey();
2833                 $newtitle = $nt->getDBkey();
2834
2835                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2836                         WatchedItem::duplicateEntries( $this, $nt );
2837                 }
2838
2839                 # Update search engine
2840                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2841                 $u->doUpdate();
2842                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2843                 $u->doUpdate();
2844
2845                 # Update site_stats
2846                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2847                         # No longer a content page
2848                         # Not viewed, edited, removing
2849                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2850                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2851                         # Now a content page
2852                         # Not viewed, edited, adding
2853                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2854                 } elseif( $pageCountChange ) {
2855                         # Redirect added
2856                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2857                 } else {
2858                         # Nothing special
2859                         $u = false;
2860                 }
2861                 if( $u )
2862                         $u->doUpdate();
2863                 # Update message cache for interface messages
2864                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2865                         global $wgMessageCache;
2866
2867                         # @bug 17860: old article can be deleted, if this the case,
2868                         # delete it from message cache
2869                         if ( $this->getArticleID() === 0 ) {
2870                                 $wgMessageCache->replace( $this->getDBkey(), false );
2871                         } else {
2872                                 $oldarticle = new Article( $this );
2873                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2874                         }
2875
2876                         $newarticle = new Article( $nt );
2877                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2878                 }
2879
2880                 global $wgUser;
2881                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2882                 return true;
2883         }
2884
2885         /**
2886          * Move page to a title which is at present a redirect to the
2887          * source page
2888          *
2889          * @param &$nt \type{Title} the page to move to, which should currently
2890          *  be a redirect
2891          * @param $reason \type{\string} The reason for the move
2892          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2893          *  Ignored if the user doesn't have the suppressredirect right
2894          */
2895         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2896                 global $wgUseSquid, $wgUser, $wgContLang;
2897
2898                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2899
2900                 if ( $reason ) {
2901                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2902                 }
2903                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
2904                 $comment = $wgContLang->truncate( $comment, 250 );
2905
2906                 $now = wfTimestampNow();
2907                 $newid = $nt->getArticleID();
2908                 $oldid = $this->getArticleID();
2909                 $latest = $this->getLatestRevID();
2910
2911                 $dbw = wfGetDB( DB_MASTER );
2912
2913                 $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
2914                 $newns = $nt->getNamespace();
2915                 $newdbk = $nt->getDBkey();
2916
2917                 # Delete the old redirect. We don't save it to history since
2918                 # by definition if we've got here it's rather uninteresting.
2919                 # We have to remove it so that the next step doesn't trigger
2920                 # a conflict on the unique namespace+title index...
2921                 $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
2922                 if ( !$dbw->cascadingDeletes() ) {
2923                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2924                         global $wgUseTrackbacks;
2925                         if ($wgUseTrackbacks)
2926                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2927                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2928                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2929                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2930                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2931                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2932                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2933                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2934                 }
2935                 // If the redirect was recently created, it may have an entry in recentchanges still
2936                 $dbw->delete( 'recentchanges',
2937                         array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
2938                         __METHOD__
2939                 );
2940
2941                 # Save a null revision in the page's history notifying of the move
2942                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2943                 $nullRevId = $nullRevision->insertOn( $dbw );
2944
2945                 $article = new Article( $this );
2946                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2947
2948                 # Change the name of the target page:
2949                 $dbw->update( 'page',
2950                         /* SET */ array(
2951                                 'page_touched'   => $dbw->timestamp($now),
2952                                 'page_namespace' => $nt->getNamespace(),
2953                                 'page_title'     => $nt->getDBkey(),
2954                                 'page_latest'    => $nullRevId,
2955                         ),
2956                         /* WHERE */ array( 'page_id' => $oldid ),
2957                         __METHOD__
2958                 );
2959                 $nt->resetArticleID( $oldid );
2960
2961                 # Recreate the redirect, this time in the other direction.
2962                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2963                         $mwRedir = MagicWord::get( 'redirect' );
2964                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2965                         $redirectArticle = new Article( $this );
2966                         $newid = $redirectArticle->insertOn( $dbw );
2967                         $redirectRevision = new Revision( array(
2968                                 'page'    => $newid,
2969                                 'comment' => $comment,
2970                                 'text'    => $redirectText ) );
2971                         $redirectRevision->insertOn( $dbw );
2972                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2973
2974                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2975
2976                         # Now, we record the link from the redirect to the new title.
2977                         # It should have no other outgoing links...
2978                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2979                         $dbw->insert( 'pagelinks',
2980                                 array(
2981                                         'pl_from'      => $newid,
2982                                         'pl_namespace' => $nt->getNamespace(),
2983                                         'pl_title'     => $nt->getDBkey() ),
2984                                 __METHOD__ );
2985                         $redirectSuppressed = false;
2986                 } else {
2987                         $this->resetArticleID( 0 );
2988                         $redirectSuppressed = true;
2989                 }
2990
2991                 # Log the move
2992                 $log = new LogPage( 'move' );
2993                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2994
2995                 # Purge squid
2996                 if ( $wgUseSquid ) {
2997                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2998                         $u = new SquidUpdate( $urls );
2999                         $u->doUpdate();
3000                 }
3001
3002         }
3003
3004         /**
3005          * Move page to non-existing title.
3006          * @param &$nt \type{Title} the new Title
3007          * @param $reason \type{\string} The reason for the move
3008          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
3009          *  Ignored if the user doesn't have the suppressredirect right
3010          */
3011         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
3012                 global $wgUseSquid, $wgUser, $wgContLang;
3013
3014                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3015                 if ( $reason ) {
3016                         $comment .= wfMsgExt( 'colon-separator',
3017                                 array( 'escapenoentities', 'content' ) );
3018                         $comment .= $reason;
3019                 }
3020                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
3021                 $comment = $wgContLang->truncate( $comment, 250 );
3022
3023                 $newid = $nt->getArticleID();
3024                 $oldid = $this->getArticleID();
3025                 $latest = $this->getLatestRevId();
3026
3027                 $dbw = wfGetDB( DB_MASTER );
3028                 $now = $dbw->timestamp();
3029
3030                 # Save a null revision in the page's history notifying of the move
3031                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3032                 if ( !is_object( $nullRevision ) ) {
3033                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3034                 }
3035                 $nullRevId = $nullRevision->insertOn( $dbw );
3036
3037                 $article = new Article( $this );
3038                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
3039
3040                 # Rename page entry
3041                 $dbw->update( 'page',
3042                         /* SET */ array(
3043                                 'page_touched'   => $now,
3044                                 'page_namespace' => $nt->getNamespace(),
3045                                 'page_title'     => $nt->getDBkey(),
3046                                 'page_latest'    => $nullRevId,
3047                         ),
3048                         /* WHERE */ array( 'page_id' => $oldid ),
3049                         __METHOD__
3050                 );
3051                 $nt->resetArticleID( $oldid );
3052
3053                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3054                         # Insert redirect
3055                         $mwRedir = MagicWord::get( 'redirect' );
3056                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3057                         $redirectArticle = new Article( $this );
3058                         $newid = $redirectArticle->insertOn( $dbw );
3059                         $redirectRevision = new Revision( array(
3060                                 'page'    => $newid,
3061                                 'comment' => $comment,
3062                                 'text'    => $redirectText ) );
3063                         $redirectRevision->insertOn( $dbw );
3064                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3065
3066                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3067
3068                         # Record the just-created redirect's linking to the page
3069                         $dbw->insert( 'pagelinks',
3070                                 array(
3071                                         'pl_from'      => $newid,
3072                                         'pl_namespace' => $nt->getNamespace(),
3073                                         'pl_title'     => $nt->getDBkey() ),
3074                                 __METHOD__ );
3075                         $redirectSuppressed = false;
3076                 } else {
3077                         $this->resetArticleID( 0 );
3078                         $redirectSuppressed = true;
3079                 }
3080
3081                 # Log the move
3082                 $log = new LogPage( 'move' );
3083                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3084
3085                 # Purge caches as per article creation
3086                 Article::onArticleCreate( $nt );
3087
3088                 # Purge old title from squid
3089                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
3090                 $this->purgeSquid();
3091
3092         }
3093
3094         /**
3095          * Move this page's subpages to be subpages of $nt
3096          * @param $nt Title Move target
3097          * @param $auth bool Whether $wgUser's permissions should be checked
3098          * @param $reason string The reason for the move
3099          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
3100          *  Ignored if the user doesn't have the 'suppressredirect' right
3101          * @return mixed array with old page titles as keys, and strings (new page titles) or
3102          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
3103          */
3104         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3105                 global $wgMaximumMovedPages;
3106                 // Check permissions
3107                 if( !$this->userCan( 'move-subpages' ) )
3108                         return array( 'cant-move-subpages' );
3109                 // Do the source and target namespaces support subpages?
3110                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
3111                         return array( 'namespace-nosubpages',
3112                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3113                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
3114                         return array( 'namespace-nosubpages',
3115                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3116
3117                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
3118                 $retval = array();
3119                 $count = 0;
3120                 foreach( $subpages as $oldSubpage ) {
3121                         $count++;
3122                         if( $count > $wgMaximumMovedPages ) {
3123                                 $retval[$oldSubpage->getPrefixedTitle()] =
3124                                                 array( 'movepage-max-pages',
3125                                                         $wgMaximumMovedPages );
3126                                 break;
3127                         }
3128
3129                         // We don't know whether this function was called before
3130                         // or after moving the root page, so check both
3131                         // $this and $nt
3132                         if( $oldSubpage->getArticleId() == $this->getArticleId() ||
3133                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3134                                 // When moving a page to a subpage of itself,
3135                                 // don't move it twice
3136                                 continue;
3137                         $newPageName = preg_replace(
3138                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
3139                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3140                                         $oldSubpage->getDBkey() );
3141                         if( $oldSubpage->isTalkPage() ) {
3142                                 $newNs = $nt->getTalkPage()->getNamespace();
3143                         } else {
3144                                 $newNs = $nt->getSubjectPage()->getNamespace();
3145                         }
3146                         # Bug 14385: we need makeTitleSafe because the new page names may
3147                         # be longer than 255 characters.
3148                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3149
3150                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3151                         if( $success === true ) {
3152                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3153                         } else {
3154                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3155                         }
3156                 }
3157                 return $retval;
3158         }
3159
3160         /**
3161          * Checks if this page is just a one-rev redirect.
3162          * Adds lock, so don't use just for light purposes.
3163          *
3164          * @return \type{\bool} TRUE or FALSE
3165          */
3166         public function isSingleRevRedirect() {
3167                 $dbw = wfGetDB( DB_MASTER );
3168                 # Is it a redirect?
3169                 $row = $dbw->selectRow( 'page',
3170                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3171                         $this->pageCond(),
3172                         __METHOD__,
3173                         array( 'FOR UPDATE' )
3174                 );
3175                 # Cache some fields we may want
3176                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3177                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3178                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3179                 if( !$this->mRedirect ) {
3180                         return false;
3181                 }
3182                 # Does the article have a history?
3183                 $row = $dbw->selectField( array( 'page', 'revision'),
3184                         'rev_id',
3185                         array( 'page_namespace' => $this->getNamespace(),
3186                                 'page_title' => $this->getDBkey(),
3187                                 'page_id=rev_page',
3188                                 'page_latest != rev_id'
3189                         ),
3190                         __METHOD__,
3191                         array( 'FOR UPDATE' )
3192                 );
3193                 # Return true if there was no history
3194                 return ($row === false);
3195         }
3196
3197         /**
3198          * Checks if $this can be moved to a given Title
3199          * - Selects for update, so don't call it unless you mean business
3200          *
3201          * @param &$nt \type{Title} the new title to check
3202          * @return \type{\bool} TRUE or FALSE
3203          */
3204         public function isValidMoveTarget( $nt ) {
3205                 $dbw = wfGetDB( DB_MASTER );
3206                 # Is it an existsing file?
3207                 if( $nt->getNamespace() == NS_FILE ) {
3208                         $file = wfLocalFile( $nt );
3209                         if( $file->exists() ) {
3210                                 wfDebug( __METHOD__ . ": file exists\n" );
3211                                 return false;
3212                         }
3213                 }
3214                 # Is it a redirect with no history?
3215                 if( !$nt->isSingleRevRedirect() ) {
3216                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3217                         return false;
3218                 }
3219                 # Get the article text
3220                 $rev = Revision::newFromTitle( $nt );
3221                 $text = $rev->getText();
3222                 # Does the redirect point to the source?
3223                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3224                 $m = array();
3225                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3226                         $redirTitle = Title::newFromText( $m[1] );
3227                         if( !is_object( $redirTitle ) ||
3228                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3229                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3230                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3231                                 return false;
3232                         }
3233                 } else {
3234                         # Fail safe
3235                         wfDebug( __METHOD__ . ": failsafe\n" );
3236                         return false;
3237                 }
3238                 return true;
3239         }
3240
3241         /**
3242          * Can this title be added to a user's watchlist?
3243          *
3244          * @return \type{\bool} TRUE or FALSE
3245          */
3246         public function isWatchable() {
3247                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3248         }
3249
3250         /**
3251          * Get categories to which this Title belongs and return an array of
3252          * categories' names.
3253          *
3254          * @return \type{\array} array an array of parents in the form:
3255          *      $parent => $currentarticle
3256          */
3257         public function getParentCategories() {
3258                 global $wgContLang;
3259
3260                 $titlekey = $this->getArticleId();
3261                 $dbr = wfGetDB( DB_SLAVE );
3262                 $categorylinks = $dbr->tableName( 'categorylinks' );
3263
3264                 # NEW SQL
3265                 $sql = "SELECT * FROM $categorylinks"
3266                      ." WHERE cl_from='$titlekey'"
3267                          ." AND cl_from <> '0'"
3268                          ." ORDER BY cl_sortkey";
3269
3270                 $res = $dbr->query( $sql );
3271
3272                 if( $dbr->numRows( $res ) > 0 ) {
3273                         foreach( $res as $row )
3274                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3275                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3276                         $dbr->freeResult( $res );
3277                 } else {
3278                         $data = array();
3279                 }
3280                 return $data;
3281         }
3282
3283         /**
3284          * Get a tree of parent categories
3285          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3286          * @return \type{\array} Tree of parent categories
3287          */
3288         public function getParentCategoryTree( $children = array() ) {
3289                 $stack = array();
3290                 $parents = $this->getParentCategories();
3291
3292                 if( $parents ) {
3293                         foreach( $parents as $parent => $current ) {
3294                                 if ( array_key_exists( $parent, $children ) ) {
3295                                         # Circular reference
3296                                         $stack[$parent] = array();
3297                                 } else {
3298                                         $nt = Title::newFromText($parent);
3299                                         if ( $nt ) {
3300                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3301                                         }
3302                                 }
3303                         }
3304                         return $stack;
3305                 } else {
3306                         return array();
3307                 }
3308         }
3309
3310
3311         /**
3312          * Get an associative array for selecting this title from
3313          * the "page" table
3314          *
3315          * @return \type{\array} Selection array
3316          */
3317         public function pageCond() {
3318                 if( $this->mArticleID > 0 ) {
3319                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3320                         return array( 'page_id' => $this->mArticleID );
3321                 } else {
3322                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3323                 }
3324         }
3325
3326         /**
3327          * Get the revision ID of the previous revision
3328          *
3329          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3330          * @param $flags \type{\int} GAID_FOR_UPDATE
3331          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3332          */
3333         public function getPreviousRevisionID( $revId, $flags=0 ) {
3334                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3335                 return $db->selectField( 'revision', 'rev_id',
3336                         array(
3337                                 'rev_page' => $this->getArticleId($flags),
3338                                 'rev_id < ' . intval( $revId )
3339                         ),
3340                         __METHOD__,
3341                         array( 'ORDER BY' => 'rev_id DESC' )
3342                 );
3343         }
3344
3345         /**
3346          * Get the revision ID of the next revision
3347          *
3348          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3349          * @param $flags \type{\int} GAID_FOR_UPDATE
3350          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3351          */
3352         public function getNextRevisionID( $revId, $flags=0 ) {
3353                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3354                 return $db->selectField( 'revision', 'rev_id',
3355                         array(
3356                                 'rev_page' => $this->getArticleId($flags),
3357                                 'rev_id > ' . intval( $revId )
3358                         ),
3359                         __METHOD__,
3360                         array( 'ORDER BY' => 'rev_id' )
3361                 );
3362         }
3363
3364         /**
3365          * Get the first revision of the page
3366          *
3367          * @param $flags \type{\int} GAID_FOR_UPDATE
3368          * @return Revision (or NULL if page doesn't exist)
3369          */
3370         public function getFirstRevision( $flags=0 ) {
3371                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3372                 $pageId = $this->getArticleId($flags);
3373                 if( !$pageId ) return null;
3374                 $row = $db->selectRow( 'revision', '*',
3375                         array( 'rev_page' => $pageId ),
3376                         __METHOD__,
3377                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3378                 );
3379                 if( !$row ) {
3380                         return null;
3381                 } else {
3382                         return new Revision( $row );
3383                 }
3384         }
3385
3386         /**
3387          * Check if this is a new page
3388          *
3389          * @return bool
3390          */
3391         public function isNewPage() {
3392                 $dbr = wfGetDB( DB_SLAVE );
3393                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3394         }
3395
3396         /**
3397          * Get the oldest revision timestamp of this page
3398          *
3399          * @return string, MW timestamp
3400          */
3401         public function getEarliestRevTime() {
3402                 $dbr = wfGetDB( DB_SLAVE );
3403                 if( $this->exists() ) {
3404                         $min = $dbr->selectField( 'revision',
3405                                 'MIN(rev_timestamp)',
3406                                 array( 'rev_page' => $this->getArticleId() ),
3407                                 __METHOD__ );
3408                         return wfTimestampOrNull( TS_MW, $min );
3409                 }
3410                 return null;
3411         }
3412
3413         /**
3414          * Get the number of revisions between the given revision IDs.
3415          * Used for diffs and other things that really need it.
3416          *
3417          * @param $old \type{\int} Revision ID.
3418          * @param $new \type{\int} Revision ID.
3419          * @return \type{\int} Number of revisions between these IDs.
3420          */
3421         public function countRevisionsBetween( $old, $new ) {
3422                 $dbr = wfGetDB( DB_SLAVE );
3423                 return (int)$dbr->selectField( 'revision', 'count(*)',
3424                         'rev_page = ' . intval( $this->getArticleId() ) .
3425                         ' AND rev_id > ' . intval( $old ) .
3426                         ' AND rev_id < ' . intval( $new ),
3427                         __METHOD__
3428                 );
3429         }
3430
3431         /**
3432          * Compare with another title.
3433          *
3434          * @param \type{Title} $title
3435          * @return \type{\bool} TRUE or FALSE
3436          */
3437         public function equals( Title $title ) {
3438                 // Note: === is necessary for proper matching of number-like titles.
3439                 return $this->getInterwiki() === $title->getInterwiki()
3440                         && $this->getNamespace() == $title->getNamespace()
3441                         && $this->getDBkey() === $title->getDBkey();
3442         }
3443
3444         /**
3445          * Callback for usort() to do title sorts by (namespace, title)
3446          */
3447         public static function compare( $a, $b ) {
3448                 if( $a->getNamespace() == $b->getNamespace() ) {
3449                         return strcmp( $a->getText(), $b->getText() );
3450                 } else {
3451                         return $a->getNamespace() - $b->getNamespace();
3452                 }
3453         }
3454
3455         /**
3456          * Return a string representation of this title
3457          *
3458          * @return \type{\string} String representation of this title
3459          */
3460         public function __toString() {
3461                 return $this->getPrefixedText();
3462         }
3463
3464         /**
3465          * Check if page exists.  For historical reasons, this function simply
3466          * checks for the existence of the title in the page table, and will
3467          * thus return false for interwiki links, special pages and the like.
3468          * If you want to know if a title can be meaningfully viewed, you should
3469          * probably call the isKnown() method instead.
3470          *
3471          * @return \type{\bool} TRUE or FALSE
3472          */
3473         public function exists() {
3474                 return $this->getArticleId() != 0;
3475         }
3476
3477         /**
3478          * Should links to this title be shown as potentially viewable (i.e. as
3479          * "bluelinks"), even if there's no record by this title in the page
3480          * table?
3481          *
3482          * This function is semi-deprecated for public use, as well as somewhat
3483          * misleadingly named.  You probably just want to call isKnown(), which
3484          * calls this function internally.
3485          *
3486          * (ISSUE: Most of these checks are cheap, but the file existence check
3487          * can potentially be quite expensive.  Including it here fixes a lot of
3488          * existing code, but we might want to add an optional parameter to skip
3489          * it and any other expensive checks.)
3490          *
3491          * @return \type{\bool} TRUE or FALSE
3492          */
3493         public function isAlwaysKnown() {
3494                 if( $this->mInterwiki != '' ) {
3495                         return true;  // any interwiki link might be viewable, for all we know
3496                 }
3497                 switch( $this->mNamespace ) {
3498                 case NS_MEDIA:
3499                 case NS_FILE:
3500                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3501                 case NS_SPECIAL:
3502                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3503                 case NS_MAIN:
3504                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3505                 case NS_MEDIAWIKI:
3506                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3507                         // the full l10n of that language to be loaded. That takes much memory and
3508                         // isn't needed. So we strip the language part away.
3509                         // Also, extension messages which are not loaded, are shown as red, because
3510                         // we don't call MessageCache::loadAllMessages.
3511                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3512                         return wfMsgWeirdKey( $basename );  // known system message
3513                 default:
3514                         return false;
3515                 }
3516         }
3517
3518         /**
3519          * Does this title refer to a page that can (or might) be meaningfully
3520          * viewed?  In particular, this function may be used to determine if
3521          * links to the title should be rendered as "bluelinks" (as opposed to
3522          * "redlinks" to non-existent pages).
3523          *
3524          * @return \type{\bool} TRUE or FALSE
3525          */
3526         public function isKnown() {
3527                 return $this->exists() || $this->isAlwaysKnown();
3528         }
3529
3530         /**
3531         * Is this in a namespace that allows actual pages?
3532         *
3533         * @return \type{\bool} TRUE or FALSE
3534         */
3535         public function canExist() {
3536                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3537         }
3538
3539         /**
3540          * Update page_touched timestamps and send squid purge messages for
3541          * pages linking to this title. May be sent to the job queue depending
3542          * on the number of links. Typically called on create and delete.
3543          */
3544         public function touchLinks() {
3545                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3546                 $u->doUpdate();
3547
3548                 if ( $this->getNamespace() == NS_CATEGORY ) {
3549                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3550                         $u->doUpdate();
3551                 }
3552         }
3553
3554         /**
3555          * Get the last touched timestamp
3556          * @param Database $db, optional db
3557          * @return \type{\string} Last touched timestamp
3558          */
3559         public function getTouched( $db = null ) {
3560                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3561                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3562                 return $touched;
3563         }
3564
3565         /**
3566          * Get the timestamp when this page was updated since the user last saw it.
3567          * @param User $user
3568          * @return mixed string/NULL
3569          */
3570         public function getNotificationTimestamp( $user = null ) {
3571                 global $wgUser, $wgShowUpdatedMarker;
3572                 // Assume current user if none given
3573                 if( !$user ) $user = $wgUser;
3574                 // Check cache first
3575                 $uid = $user->getId();
3576                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3577                         return $this->mNotificationTimestamp[$uid];
3578                 }
3579                 if( !$uid || !$wgShowUpdatedMarker ) {
3580                         return $this->mNotificationTimestamp[$uid] = false;
3581                 }
3582                 // Don't cache too much!
3583                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3584                         $this->mNotificationTimestamp = array();
3585                 }
3586                 $dbr = wfGetDB( DB_SLAVE );
3587                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3588                         'wl_notificationtimestamp',
3589                         array( 'wl_namespace' => $this->getNamespace(),
3590                                 'wl_title' => $this->getDBkey(),
3591                                 'wl_user' => $user->getId()
3592                         ),
3593                         __METHOD__
3594                 );
3595                 return $this->mNotificationTimestamp[$uid];
3596         }
3597
3598         /**
3599          * Get the trackback URL for this page
3600          * @return \type{\string} Trackback URL
3601          */
3602         public function trackbackURL() {
3603                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3604
3605                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3606                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3607         }
3608
3609         /**
3610          * Get the trackback RDF for this page
3611          * @return \type{\string} Trackback RDF
3612          */
3613         public function trackbackRDF() {
3614                 $url = htmlspecialchars($this->getFullURL());
3615                 $title = htmlspecialchars($this->getText());
3616                 $tburl = $this->trackbackURL();
3617
3618                 // Autodiscovery RDF is placed in comments so HTML validator
3619                 // won't barf. This is a rather icky workaround, but seems
3620                 // frequently used by this kind of RDF thingy.
3621                 //
3622                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3623                 return "<!--
3624 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3625          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3626          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3627 <rdf:Description
3628    rdf:about=\"$url\"
3629    dc:identifier=\"$url\"
3630    dc:title=\"$title\"
3631    trackback:ping=\"$tburl\" />
3632 </rdf:RDF>
3633 -->";
3634         }
3635
3636         /**
3637          * Generate strings used for xml 'id' names in monobook tabs
3638          * @return \type{\string} XML 'id' name
3639          */
3640         public function getNamespaceKey( $prepend = 'nstab-' ) {
3641                 global $wgContLang;
3642                 // Gets the subject namespace if this title
3643                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
3644                 // Checks if cononical namespace name exists for namespace
3645                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
3646                         // Uses canonical namespace name
3647                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
3648                 } else {
3649                         // Uses text of namespace
3650                         $namespaceKey = $this->getSubjectNsText();
3651                 }
3652                 // Makes namespace key lowercase
3653                 $namespaceKey = $wgContLang->lc( $namespaceKey );
3654                 // Uses main
3655                 if ( $namespaceKey == '' ) {
3656                         $namespaceKey = 'main';
3657                 }
3658                 // Changes file to image for backwards compatibility
3659                 if ( $namespaceKey == 'file' ) {
3660                         $namespaceKey = 'image';
3661                 }
3662                 return $prepend . $namespaceKey;
3663         }
3664
3665         /**
3666          * Returns true if this is a special page.
3667          */
3668         public function isSpecialPage( ) {
3669                 return $this->getNamespace() == NS_SPECIAL;
3670         }
3671
3672         /**
3673          * Returns true if this title resolves to the named special page
3674          * @param $name \type{\string} The special page name
3675          */
3676         public function isSpecial( $name ) {
3677                 if ( $this->getNamespace() == NS_SPECIAL ) {
3678                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3679                         if ( $name == $thisName ) {
3680                                 return true;
3681                         }
3682                 }
3683                 return false;
3684         }
3685
3686         /**
3687          * If the Title refers to a special page alias which is not the local default,
3688          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3689          */
3690         public function fixSpecialName() {
3691                 if ( $this->getNamespace() == NS_SPECIAL ) {
3692                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3693                         if ( $canonicalName ) {
3694                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3695                                 if ( $localName != $this->mDbkeyform ) {
3696                                         return Title::makeTitle( NS_SPECIAL, $localName );
3697                                 }
3698                         }
3699                 }
3700                 return $this;
3701         }
3702
3703         /**
3704          * Is this Title in a namespace which contains content?
3705          * In other words, is this a content page, for the purposes of calculating
3706          * statistics, etc?
3707          *
3708          * @return \type{\bool} TRUE or FALSE
3709          */
3710         public function isContentPage() {
3711                 return MWNamespace::isContent( $this->getNamespace() );
3712         }
3713
3714         /**
3715          * Get all extant redirects to this Title
3716          *
3717          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3718          *            NULL to consider all namespaces
3719          * @return \type{\arrayof{Title}} Redirects to this title
3720          */
3721         public function getRedirectsHere( $ns = null ) {
3722                 $redirs = array();
3723
3724                 $dbr = wfGetDB( DB_SLAVE );
3725                 $where = array(
3726                         'rd_namespace' => $this->getNamespace(),
3727                         'rd_title' => $this->getDBkey(),
3728                         'rd_from = page_id'
3729                 );
3730                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3731
3732                 $res = $dbr->select(
3733                         array( 'redirect', 'page' ),
3734                         array( 'page_namespace', 'page_title' ),
3735                         $where,
3736                         __METHOD__
3737                 );
3738
3739
3740                 foreach( $res as $row ) {
3741                         $redirs[] = self::newFromRow( $row );
3742                 }
3743                 return $redirs;
3744         }
3745
3746         /**
3747          * Check if this Title is a valid redirect target
3748          *
3749          * @return \type{\bool} TRUE or FALSE
3750          */
3751         public function isValidRedirectTarget() {
3752                 global $wgInvalidRedirectTargets;
3753
3754                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3755                 if( $this->isSpecial( 'Userlogout' ) ) {
3756                         return false;
3757                 }
3758
3759                 foreach( $wgInvalidRedirectTargets as $target ) {
3760                         if( $this->isSpecial( $target ) ) {
3761                                 return false;
3762                         }
3763                 }
3764
3765                 return true;
3766         }
3767
3768         /**
3769          * Get a backlink cache object
3770          */
3771         function getBacklinkCache() {
3772                 if ( is_null( $this->mBacklinkCache ) ) {
3773                         $this->mBacklinkCache = new BacklinkCache( $this );
3774                 }
3775                 return $this->mBacklinkCache;
3776         }
3777
3778         /**
3779          * Whether the magic words __INDEX__ and __NOINDEX__ function for
3780          * this page.
3781          * @return Bool
3782          */
3783         public function canUseNoindex(){
3784                 global $wgArticleRobotPolicies, $wgContentNamespaces,
3785                        $wgExemptFromUserRobotsControl;
3786
3787                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
3788                         ? $wgContentNamespaces
3789                         : $wgExemptFromUserRobotsControl;
3790
3791                 return !in_array( $this->mNamespace, $bannedNamespaces );
3792
3793         }
3794
3795         public function getRestrictionTypes() {
3796                 global $wgRestrictionTypes;
3797                 $types = $this->exists() ? $wgRestrictionTypes : array('create');
3798
3799                 if ( $this->getNamespace() == NS_FILE ) {
3800                         $types[] = 'upload';
3801                 }
3802
3803                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
3804
3805                 return $types;
3806         }
3807 }