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                                 global $wgLang;
1229                                 $return = array(
1230                                         'badaccess-groups',
1231                                         $wgLang->commaList( $groups ),
1232                                         count( $groups )
1233                                 );
1234                         } else {
1235                                 $return = array( "badaccess-group0" );
1236                         }
1237                         $errors[] = $return;
1238                 }
1239
1240                 # Short-circuit point
1241                 if( $short && count($errors) > 0 ) {
1242                         wfProfileOut( __METHOD__ );
1243                         return $errors;
1244                 }
1245
1246                 // Use getUserPermissionsErrors instead
1247                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1248                         wfProfileOut( __METHOD__ );
1249                         return $result ? array() : array( array( 'badaccess-group0' ) );
1250                 }
1251                 // Check getUserPermissionsErrors hook
1252                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1253                         if( is_array($result) && count($result) && !is_array($result[0]) )
1254                                 $errors[] = $result; # A single array representing an error
1255                         else if( is_array($result) && is_array($result[0]) )
1256                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1257                         else if( $result !== '' && is_string($result) )
1258                                 $errors[] = array($result); # A string representing a message-id
1259                         else if( $result === false )
1260                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1261                 }
1262                 # Short-circuit point
1263                 if( $short && count($errors) > 0 ) {
1264                         wfProfileOut( __METHOD__ );
1265                         return $errors;
1266                 }
1267                 // Check getUserPermissionsErrorsExpensive hook
1268                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1269                         if( is_array($result) && count($result) && !is_array($result[0]) )
1270                                 $errors[] = $result; # A single array representing an error
1271                         else if( is_array($result) && is_array($result[0]) )
1272                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1273                         else if( $result !== '' && is_string($result) )
1274                                 $errors[] = array($result); # A string representing a message-id
1275                         else if( $result === false )
1276                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1277                 }
1278                 # Short-circuit point
1279                 if( $short && count($errors) > 0 ) {
1280                         wfProfileOut( __METHOD__ );
1281                         return $errors;
1282                 }
1283
1284                 # Only 'createaccount' and 'execute' can be performed on
1285                 # special pages, which don't actually exist in the DB.
1286                 $specialOKActions = array( 'createaccount', 'execute' );
1287                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1288                         $errors[] = array('ns-specialprotected');
1289                 }
1290
1291                 # Check $wgNamespaceProtection for restricted namespaces
1292                 if( $this->isNamespaceProtected() ) {
1293                         $ns = $this->getNamespace() == NS_MAIN ?
1294                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1295                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1296                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1297                 }
1298
1299                 # Protect css/js subpages of user pages
1300                 # XXX: this might be better using restrictions
1301                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssSubpage()
1302                 #      and $this->userCanEditJsSubpage() from working
1303                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1304                 if( $this->isCssSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('editusercss') )
1305                         && $action != 'patrol'
1306                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1307                 {
1308                         $errors[] = array('customcssjsprotected');
1309                 } else if( $this->isJsSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('edituserjs') )
1310                         && $action != 'patrol'
1311                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1312                 {
1313                         $errors[] = array('customcssjsprotected');
1314                 }
1315
1316                 # Check against page_restrictions table requirements on this
1317                 # page. The user must possess all required rights for this action.
1318                 foreach( $this->getRestrictions($action) as $right ) {
1319                         // Backwards compatibility, rewrite sysop -> protect
1320                         if( $right == 'sysop' ) {
1321                                 $right = 'protect';
1322                         }
1323                         if( $right != '' && !$user->isAllowed( $right ) ) {
1324                                 // Users with 'editprotected' permission can edit protected pages
1325                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1326                                         // Users with 'editprotected' permission cannot edit protected pages
1327                                         // with cascading option turned on.
1328                                         if( $this->mCascadeRestriction ) {
1329                                                 $errors[] = array( 'protectedpagetext', $right );
1330                                         }
1331                                 } else {
1332                                         $errors[] = array( 'protectedpagetext', $right );
1333                                 }
1334                         }
1335                 }
1336                 # Short-circuit point
1337                 if( $short && count($errors) > 0 ) {
1338                         wfProfileOut( __METHOD__ );
1339                         return $errors;
1340                 }
1341
1342                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1343                         # We /could/ use the protection level on the source page, but it's fairly ugly
1344                         #  as we have to establish a precedence hierarchy for pages included by multiple
1345                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1346                         #  as they could remove the protection anyway.
1347                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1348                         # Cascading protection depends on more than this page...
1349                         # Several cascading protected pages may include this page...
1350                         # Check each cascading level
1351                         # This is only for protection restrictions, not for all actions
1352                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1353                                 foreach( $restrictions[$action] as $right ) {
1354                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1355                                         if( $right != '' && !$user->isAllowed( $right ) ) {
1356                                                 $pages = '';
1357                                                 foreach( $cascadingSources as $page )
1358                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1359                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1360                                         }
1361                                 }
1362                         }
1363                 }
1364                 # Short-circuit point
1365                 if( $short && count($errors) > 0 ) {
1366                         wfProfileOut( __METHOD__ );
1367                         return $errors;
1368                 }
1369
1370                 if( $action == 'protect' ) {
1371                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1372                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1373                         }
1374                 }
1375
1376                 if( $action == 'create' ) {
1377                         $title_protection = $this->getTitleProtection();
1378                         if( is_array($title_protection) ) {
1379                                 extract($title_protection); // is this extract() really needed?
1380
1381                                 if( $pt_create_perm == 'sysop' ) {
1382                                         $pt_create_perm = 'protect'; // B/C
1383                                 }
1384                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1385                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1386                                 }
1387                         }
1388                 } elseif( $action == 'move' ) {
1389                         // Check for immobile pages
1390                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1391                                 // Specific message for this case
1392                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1393                         } elseif( !$this->isMovable() ) {
1394                                 // Less specific message for rarer cases
1395                                 $errors[] = array( 'immobile-page' );
1396                         }
1397                 } elseif( $action == 'move-target' ) {
1398                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1399                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1400                         } elseif( !$this->isMovable() ) {
1401                                 $errors[] = array( 'immobile-target-page' );
1402                         }
1403                 }
1404
1405                 wfProfileOut( __METHOD__ );
1406                 return $errors;
1407         }
1408
1409         /**
1410          * Is this title subject to title protection?
1411          * @return \type{\mixed} An associative array representing any existent title
1412          *   protection, or false if there's none.
1413          */
1414         private function getTitleProtection() {
1415                 // Can't protect pages in special namespaces
1416                 if ( $this->getNamespace() < 0 ) {
1417                         return false;
1418                 }
1419
1420                 // Can't protect pages that exist.
1421                 if ($this->exists()) {
1422                         return false;
1423                 }
1424
1425                 $dbr = wfGetDB( DB_SLAVE );
1426                 $res = $dbr->select( 'protected_titles', '*',
1427                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1428                         __METHOD__ );
1429
1430                 if ($row = $dbr->fetchRow( $res )) {
1431                         return $row;
1432                 } else {
1433                         return false;
1434                 }
1435         }
1436
1437         /**
1438          * Update the title protection status
1439          * @param $create_perm \type{\string} Permission required for creation
1440          * @param $reason \type{\string} Reason for protection
1441          * @param $expiry \type{\string} Expiry timestamp
1442          */
1443         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1444                 global $wgUser,$wgContLang;
1445
1446                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1447                         && $expiry == $this->mRestrictionsExpiry['create']) {
1448                         // No change
1449                         return true;
1450                 }
1451
1452                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1453
1454                 $dbw = wfGetDB( DB_MASTER );
1455
1456                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1457
1458                 $expiry_description = '';
1459                 if ( $encodedExpiry != 'infinity' ) {
1460                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',$wgContLang->timeanddate( $expiry ),
1461                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1462                 }
1463                 else {
1464                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1465                 }
1466
1467                 # Update protection table
1468                 if ($create_perm != '' ) {
1469                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1470                                 array(
1471                                         'pt_namespace' => $namespace,
1472                                         'pt_title' => $title,
1473                                         'pt_create_perm' => $create_perm,
1474                                         'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw),
1475                                         'pt_expiry' => $encodedExpiry,
1476                                         'pt_user' => $wgUser->getId(),
1477                                         'pt_reason' => $reason,
1478                                 ), __METHOD__
1479                         );
1480                 } else {
1481                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1482                                 'pt_title' => $title ), __METHOD__ );
1483                 }
1484                 # Update the protection log
1485                 if( $dbw->affectedRows() ) {
1486                         $log = new LogPage( 'protect' );
1487
1488                         if( $create_perm ) {
1489                                 $params = array("[create=$create_perm] $expiry_description",'');
1490                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
1491                         } else {
1492                                 $log->addEntry( 'unprotect', $this, $reason );
1493                         }
1494                 }
1495
1496                 return true;
1497         }
1498
1499         /**
1500          * Remove any title protection due to page existing
1501          */
1502         public function deleteTitleProtection() {
1503                 $dbw = wfGetDB( DB_MASTER );
1504
1505                 $dbw->delete( 'protected_titles',
1506                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1507                         __METHOD__ );
1508         }
1509
1510         /**
1511          * Would anybody with sufficient privileges be able to move this page?
1512          * Some pages just aren't movable.
1513          *
1514          * @return \type{\bool} TRUE or FALSE
1515          */
1516         public function isMovable() {
1517                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1518         }
1519
1520         /**
1521          * Can $wgUser read this page?
1522          * @return \type{\bool} TRUE or FALSE
1523          * @todo fold these checks into userCan()
1524          */
1525         public function userCanRead() {
1526                 global $wgUser, $wgGroupPermissions;
1527
1528                 static $useShortcut = null;
1529
1530                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1531                 if( is_null( $useShortcut ) ) {
1532                         global $wgRevokePermissions;
1533                         $useShortcut = true;
1534                         if( empty( $wgGroupPermissions['*']['read'] ) ) {
1535                                 # Not a public wiki, so no shortcut
1536                                 $useShortcut = false;
1537                         } elseif( !empty( $wgRevokePermissions ) ) {
1538                                 /*
1539                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1540                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1541                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1542                                  * reading is allowed.
1543                                  */
1544                                 foreach( $wgRevokePermissions as $perms ) {
1545                                         if( !empty( $perms['read'] ) ) {
1546                                                 # We might be removing the read right from the user, so no shortcut
1547                                                 $useShortcut = false;
1548                                                 break;
1549                                         }
1550                                 }
1551                         }
1552                 }
1553
1554                 $result = null;
1555                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1556                 if ( $result !== null ) {
1557                         return $result;
1558                 }
1559
1560                 # Shortcut for public wikis, allows skipping quite a bit of code
1561                 if ( $useShortcut )
1562                         return true;
1563
1564                 if( $wgUser->isAllowed( 'read' ) ) {
1565                         return true;
1566                 } else {
1567                         global $wgWhitelistRead;
1568
1569                         /**
1570                          * Always grant access to the login page.
1571                          * Even anons need to be able to log in.
1572                         */
1573                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1574                                 return true;
1575                         }
1576
1577                         /**
1578                          * Bail out if there isn't whitelist
1579                          */
1580                         if( !is_array($wgWhitelistRead) ) {
1581                                 return false;
1582                         }
1583
1584                         /**
1585                          * Check for explicit whitelisting
1586                          */
1587                         $name = $this->getPrefixedText();
1588                         $dbName = $this->getPrefixedDBKey();
1589                         // Check with and without underscores
1590                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1591                                 return true;
1592
1593                         /**
1594                          * Old settings might have the title prefixed with
1595                          * a colon for main-namespace pages
1596                          */
1597                         if( $this->getNamespace() == NS_MAIN ) {
1598                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1599                                         return true;
1600                         }
1601
1602                         /**
1603                          * If it's a special page, ditch the subpage bit
1604                          * and check again
1605                          */
1606                         if( $this->getNamespace() == NS_SPECIAL ) {
1607                                 $name = $this->getDBkey();
1608                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1609                                 if ( $name === false ) {
1610                                         # Invalid special page, but we show standard login required message
1611                                         return false;
1612                                 }
1613
1614                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1615                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1616                                         return true;
1617                         }
1618
1619                 }
1620                 return false;
1621         }
1622
1623         /**
1624          * Is this a talk page of some sort?
1625          * @return \type{\bool} TRUE or FALSE
1626          */
1627         public function isTalkPage() {
1628                 return MWNamespace::isTalk( $this->getNamespace() );
1629         }
1630
1631         /**
1632          * Is this a subpage?
1633          * @return \type{\bool} TRUE or FALSE
1634          */
1635         public function isSubpage() {
1636                 return MWNamespace::hasSubpages( $this->mNamespace )
1637                         ? strpos( $this->getText(), '/' ) !== false
1638                         : false;
1639         }
1640
1641         /**
1642          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1643          * @return \type{\bool} TRUE or FALSE
1644          */
1645         public function hasSubpages() {
1646                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1647                         # Duh
1648                         return false;
1649                 }
1650
1651                 # We dynamically add a member variable for the purpose of this method
1652                 # alone to cache the result.  There's no point in having it hanging
1653                 # around uninitialized in every Title object; therefore we only add it
1654                 # if needed and don't declare it statically.
1655                 if( isset( $this->mHasSubpages ) ) {
1656                         return $this->mHasSubpages;
1657                 }
1658
1659                 $subpages = $this->getSubpages( 1 );
1660                 if( $subpages instanceof TitleArray )
1661                         return $this->mHasSubpages = (bool)$subpages->count();
1662                 return $this->mHasSubpages = false;
1663         }
1664
1665         /**
1666          * Get all subpages of this page.
1667          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1668          * @return mixed TitleArray, or empty array if this page's namespace
1669          *  doesn't allow subpages
1670          */
1671         public function getSubpages( $limit = -1 ) {
1672                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1673                         return array();
1674
1675                 $dbr = wfGetDB( DB_SLAVE );
1676                 $conds['page_namespace'] = $this->getNamespace();
1677                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
1678                 $options = array();
1679                 if( $limit > -1 )
1680                         $options['LIMIT'] = $limit;
1681                 return $this->mSubpages = TitleArray::newFromResult(
1682                         $dbr->select( 'page',
1683                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1684                                 $conds,
1685                                 __METHOD__,
1686                                 $options
1687                         )
1688                 );
1689         }
1690
1691         /**
1692          * Could this page contain custom CSS or JavaScript, based
1693          * on the title?
1694          *
1695          * @return \type{\bool} TRUE or FALSE
1696          */
1697         public function isCssOrJsPage() {
1698                 return $this->mNamespace == NS_MEDIAWIKI
1699                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1700         }
1701
1702         /**
1703          * Is this a .css or .js subpage of a user page?
1704          * @return \type{\bool} TRUE or FALSE
1705          */
1706         public function isCssJsSubpage() {
1707                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1708         }
1709         /**
1710          * Is this a *valid* .css or .js subpage of a user page?
1711          * Check that the corresponding skin exists
1712          * @return \type{\bool} TRUE or FALSE
1713          */
1714         public function isValidCssJsSubpage() {
1715                 if ( $this->isCssJsSubpage() ) {
1716                         $name = $this->getSkinFromCssJsSubpage();
1717                         if ( $name == 'common' ) return true;
1718                         $skinNames = Skin::getSkinNames();
1719                         return array_key_exists( $name, $skinNames );
1720                 } else {
1721                         return false;
1722                 }
1723         }
1724         /**
1725          * Trim down a .css or .js subpage title to get the corresponding skin name
1726          */
1727         public function getSkinFromCssJsSubpage() {
1728                 $subpage = explode( '/', $this->mTextform );
1729                 $subpage = $subpage[ count( $subpage ) - 1 ];
1730                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1731         }
1732         /**
1733          * Is this a .css subpage of a user page?
1734          * @return \type{\bool} TRUE or FALSE
1735          */
1736         public function isCssSubpage() {
1737                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1738         }
1739         /**
1740          * Is this a .js subpage of a user page?
1741          * @return \type{\bool} TRUE or FALSE
1742          */
1743         public function isJsSubpage() {
1744                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1745         }
1746         /**
1747          * Protect css subpages of user pages: can $wgUser edit
1748          * this page?
1749          *
1750          * @return \type{\bool} TRUE or FALSE
1751          * @todo XXX: this might be better using restrictions
1752          */
1753         public function userCanEditCssSubpage() {
1754                 global $wgUser;
1755                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('editusercss') )
1756                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1757         }
1758         /**
1759          * Protect js subpages of user pages: can $wgUser edit
1760          * this page?
1761          *
1762          * @return \type{\bool} TRUE or FALSE
1763          * @todo XXX: this might be better using restrictions
1764          */
1765         public function userCanEditJsSubpage() {
1766                 global $wgUser;
1767                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('edituserjs') )
1768                        || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1769         }
1770
1771         /**
1772          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1773          *
1774          * @return \type{\bool} If the page is subject to cascading restrictions.
1775          */
1776         public function isCascadeProtected() {
1777                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1778                 return ( $sources > 0 );
1779         }
1780
1781         /**
1782          * Cascading protection: Get the source of any cascading restrictions on this page.
1783          *
1784          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1785          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1786          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1787          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1788          */
1789         public function getCascadeProtectionSources( $get_pages = true ) {
1790                 $pagerestrictions = array();
1791
1792                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1793                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1794                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1795                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1796                 }
1797
1798                 wfProfileIn( __METHOD__ );
1799
1800                 $dbr = wfGetDB( DB_SLAVE );
1801
1802                 if ( $this->getNamespace() == NS_FILE ) {
1803                         $tables = array ('imagelinks', 'page_restrictions');
1804                         $where_clauses = array(
1805                                 'il_to' => $this->getDBkey(),
1806                                 'il_from=pr_page',
1807                                 'pr_cascade' => 1 );
1808                 } else {
1809                         $tables = array ('templatelinks', 'page_restrictions');
1810                         $where_clauses = array(
1811                                 'tl_namespace' => $this->getNamespace(),
1812                                 'tl_title' => $this->getDBkey(),
1813                                 'tl_from=pr_page',
1814                                 'pr_cascade' => 1 );
1815                 }
1816
1817                 if ( $get_pages ) {
1818                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1819                         $where_clauses[] = 'page_id=pr_page';
1820                         $tables[] = 'page';
1821                 } else {
1822                         $cols = array( 'pr_expiry' );
1823                 }
1824
1825                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1826
1827                 $sources = $get_pages ? array() : false;
1828                 $now = wfTimestampNow();
1829                 $purgeExpired = false;
1830
1831                 foreach( $res as $row ) {
1832                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1833                         if( $expiry > $now ) {
1834                                 if ($get_pages) {
1835                                         $page_id = $row->pr_page;
1836                                         $page_ns = $row->page_namespace;
1837                                         $page_title = $row->page_title;
1838                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1839                                         # Add groups needed for each restriction type if its not already there
1840                                         # Make sure this restriction type still exists
1841
1842                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
1843                                                 $pagerestrictions[$row->pr_type] = array();
1844                                         }
1845
1846                                         if ( isset($pagerestrictions[$row->pr_type]) &&
1847                                                         !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1848                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1849                                         }
1850                                 } else {
1851                                         $sources = true;
1852                                 }
1853                         } else {
1854                                 // Trigger lazy purge of expired restrictions from the db
1855                                 $purgeExpired = true;
1856                         }
1857                 }
1858                 if( $purgeExpired ) {
1859                         Title::purgeExpiredRestrictions();
1860                 }
1861
1862                 wfProfileOut( __METHOD__ );
1863
1864                 if ( $get_pages ) {
1865                         $this->mCascadeSources = $sources;
1866                         $this->mCascadingRestrictions = $pagerestrictions;
1867                 } else {
1868                         $this->mHasCascadingRestrictions = $sources;
1869                 }
1870                 return array( $sources, $pagerestrictions );
1871         }
1872
1873         function areRestrictionsCascading() {
1874                 if (!$this->mRestrictionsLoaded) {
1875                         $this->loadRestrictions();
1876                 }
1877
1878                 return $this->mCascadeRestriction;
1879         }
1880
1881         /**
1882          * Loads a string into mRestrictions array
1883          * @param $res \type{Resource} restrictions as an SQL result.
1884          */
1885         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
1886                 $rows = array();
1887                 $dbr = wfGetDB( DB_SLAVE );
1888
1889                 while( $row = $dbr->fetchObject( $res ) ) {
1890                         $rows[] = $row;
1891                 }
1892
1893                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
1894         }
1895
1896         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
1897                 $dbr = wfGetDB( DB_SLAVE );
1898
1899                 $restrictionTypes = $this->getRestrictionTypes();
1900
1901                 foreach( $restrictionTypes as $type ){
1902                         $this->mRestrictions[$type] = array();
1903                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1904                 }
1905
1906                 $this->mCascadeRestriction = false;
1907
1908                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1909
1910                 if ( $oldFashionedRestrictions === null ) {
1911                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1912                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1913                 }
1914
1915                 if ($oldFashionedRestrictions != '') {
1916
1917                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1918                                 $temp = explode( '=', trim( $restrict ) );
1919                                 if(count($temp) == 1) {
1920                                         // old old format should be treated as edit/move restriction
1921                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1922                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1923                                 } else {
1924                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1925                                 }
1926                         }
1927
1928                         $this->mOldRestrictions = true;
1929
1930                 }
1931
1932                 if( count($rows) ) {
1933                         # Current system - load second to make them override.
1934                         $now = wfTimestampNow();
1935                         $purgeExpired = false;
1936
1937                         foreach( $rows as $row ) {
1938                                 # Cycle through all the restrictions.
1939
1940                                 // Don't take care of restrictions types that aren't allowed
1941
1942                                 if( !in_array( $row->pr_type, $restrictionTypes ) )
1943                                         continue;
1944
1945                                 // This code should be refactored, now that it's being used more generally,
1946                                 // But I don't really see any harm in leaving it in Block for now -werdna
1947                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1948
1949                                 // Only apply the restrictions if they haven't expired!
1950                                 if ( !$expiry || $expiry > $now ) {
1951                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1952                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1953
1954                                         $this->mCascadeRestriction |= $row->pr_cascade;
1955                                 } else {
1956                                         // Trigger a lazy purge of expired restrictions
1957                                         $purgeExpired = true;
1958                                 }
1959                         }
1960
1961                         if( $purgeExpired ) {
1962                                 Title::purgeExpiredRestrictions();
1963                         }
1964                 }
1965
1966                 $this->mRestrictionsLoaded = true;
1967         }
1968
1969         /**
1970          * Load restrictions from the page_restrictions table
1971          */
1972         public function loadRestrictions( $oldFashionedRestrictions = null ) {
1973                 if( !$this->mRestrictionsLoaded ) {
1974                         if ($this->exists()) {
1975                                 $dbr = wfGetDB( DB_SLAVE );
1976
1977                                 $res = $dbr->select( 'page_restrictions', '*',
1978                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1979
1980                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
1981                         } else {
1982                                 $title_protection = $this->getTitleProtection();
1983
1984                                 if (is_array($title_protection)) {
1985                                         extract($title_protection);
1986
1987                                         $now = wfTimestampNow();
1988                                         $expiry = Block::decodeExpiry($pt_expiry);
1989
1990                                         if (!$expiry || $expiry > $now) {
1991                                                 // Apply the restrictions
1992                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1993                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1994                                         } else { // Get rid of the old restrictions
1995                                                 Title::purgeExpiredRestrictions();
1996                                         }
1997                                 } else {
1998                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1999                                 }
2000                                 $this->mRestrictionsLoaded = true;
2001                         }
2002                 }
2003         }
2004
2005         /**
2006          * Purge expired restrictions from the page_restrictions table
2007          */
2008         static function purgeExpiredRestrictions() {
2009                 $dbw = wfGetDB( DB_MASTER );
2010                 $dbw->delete( 'page_restrictions',
2011                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2012                         __METHOD__ );
2013
2014                 $dbw->delete( 'protected_titles',
2015                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2016                         __METHOD__ );
2017         }
2018
2019         /**
2020          * Accessor/initialisation for mRestrictions
2021          *
2022          * @param $action \type{\string} action that permission needs to be checked for
2023          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
2024          */
2025         public function getRestrictions( $action ) {
2026                 if( !$this->mRestrictionsLoaded ) {
2027                         $this->loadRestrictions();
2028                 }
2029                 return isset( $this->mRestrictions[$action] )
2030                                 ? $this->mRestrictions[$action]
2031                                 : array();
2032         }
2033
2034         /**
2035          * Get the expiry time for the restriction against a given action
2036          * @return 14-char timestamp, or 'infinity' if the page is protected forever
2037          * or not protected at all, or false if the action is not recognised.
2038          */
2039         public function getRestrictionExpiry( $action ) {
2040                 if( !$this->mRestrictionsLoaded ) {
2041                         $this->loadRestrictions();
2042                 }
2043                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2044         }
2045
2046         /**
2047          * Is there a version of this page in the deletion archive?
2048          * @return \type{\int} the number of archived revisions
2049          */
2050         public function isDeleted() {
2051                 if( $this->getNamespace() < 0 ) {
2052                         $n = 0;
2053                 } else {
2054                         $dbr = wfGetDB( DB_SLAVE );
2055                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2056                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2057                                 __METHOD__
2058                         );
2059                         if( $this->getNamespace() == NS_FILE ) {
2060                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2061                                         array( 'fa_name' => $this->getDBkey() ),
2062                                         __METHOD__
2063                                 );
2064                         }
2065                 }
2066                 return (int)$n;
2067         }
2068
2069         /**
2070          * Is there a version of this page in the deletion archive?
2071          * @return bool
2072          */
2073         public function isDeletedQuick() {
2074                 if( $this->getNamespace() < 0 ) {
2075                         return false;
2076                 }
2077                 $dbr = wfGetDB( DB_SLAVE );
2078                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2079                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2080                         __METHOD__
2081                 );
2082                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
2083                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2084                                 array( 'fa_name' => $this->getDBkey() ),
2085                                 __METHOD__
2086                         );
2087                 }
2088                 return $deleted;
2089         }
2090
2091         /**
2092          * Get the article ID for this Title from the link cache,
2093          * adding it if necessary
2094          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2095          *  for update
2096          * @return \type{\int} the ID
2097          */
2098         public function getArticleID( $flags = 0 ) {
2099                 if( $this->getNamespace() < 0 ) {
2100                         return $this->mArticleID = 0;
2101                 }
2102                 $linkCache = LinkCache::singleton();
2103                 if( $flags & GAID_FOR_UPDATE ) {
2104                         $oldUpdate = $linkCache->forUpdate( true );
2105                         $linkCache->clearLink( $this );
2106                         $this->mArticleID = $linkCache->addLinkObj( $this );
2107                         $linkCache->forUpdate( $oldUpdate );
2108                 } else {
2109                         if( -1 == $this->mArticleID ) {
2110                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2111                         }
2112                 }
2113                 return $this->mArticleID;
2114         }
2115
2116         /**
2117          * Is this an article that is a redirect page?
2118          * Uses link cache, adding it if necessary
2119          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2120          * @return \type{\bool}
2121          */
2122         public function isRedirect( $flags = 0 ) {
2123                 if( !is_null($this->mRedirect) )
2124                         return $this->mRedirect;
2125                 # Calling getArticleID() loads the field from cache as needed
2126                 if( !$this->getArticleID($flags) ) {
2127                         return $this->mRedirect = false;
2128                 }
2129                 $linkCache = LinkCache::singleton();
2130                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2131
2132                 return $this->mRedirect;
2133         }
2134
2135         /**
2136          * What is the length of this page?
2137          * Uses link cache, adding it if necessary
2138          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2139          * @return \type{\bool}
2140          */
2141         public function getLength( $flags = 0 ) {
2142                 if( $this->mLength != -1 )
2143                         return $this->mLength;
2144                 # Calling getArticleID() loads the field from cache as needed
2145                 if( !$this->getArticleID($flags) ) {
2146                         return $this->mLength = 0;
2147                 }
2148                 $linkCache = LinkCache::singleton();
2149                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2150
2151                 return $this->mLength;
2152         }
2153
2154         /**
2155          * What is the page_latest field for this page?
2156          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2157          * @return \type{\int} or false if the page doesn't exist
2158          */
2159         public function getLatestRevID( $flags = 0 ) {
2160                 if( $this->mLatestID !== false )
2161                         return $this->mLatestID;
2162
2163                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2164                 $this->mLatestID = (int)$db->selectField(
2165                         'page', 'page_latest', $this->pageCond(), __METHOD__ );
2166                 return $this->mLatestID;
2167         }
2168
2169         /**
2170          * This clears some fields in this object, and clears any associated
2171          * keys in the "bad links" section of the link cache.
2172          *
2173          * - This is called from Article::insertNewArticle() to allow
2174          * loading of the new page_id. It's also called from
2175          * Article::doDeleteArticle()
2176          *
2177          * @param $newid \type{\int} the new Article ID
2178          */
2179         public function resetArticleID( $newid ) {
2180                 $linkCache = LinkCache::singleton();
2181                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2182
2183                 if ( $newid === false ) {
2184                         $this->mArticleID = -1;
2185                 } else {
2186                         $this->mArticleID = intval( $newid );
2187                 }
2188                 $this->mRestrictionsLoaded = false;
2189                 $this->mRestrictions = array();
2190                 $this->mRedirect = null;
2191                 $this->mLength = -1;
2192                 $this->mLatestID = false;
2193         }
2194
2195         /**
2196          * Updates page_touched for this page; called from LinksUpdate.php
2197          * @return \type{\bool} true if the update succeded
2198          */
2199         public function invalidateCache() {
2200                 if( wfReadOnly() ) {
2201                         return;
2202                 }
2203                 $dbw = wfGetDB( DB_MASTER );
2204                 $success = $dbw->update( 'page',
2205                         array( 'page_touched' => $dbw->timestamp() ),
2206                         $this->pageCond(),
2207                         __METHOD__
2208                 );
2209                 HTMLFileCache::clearFileCache( $this );
2210                 return $success;
2211         }
2212
2213         /**
2214          * Prefix some arbitrary text with the namespace or interwiki prefix
2215          * of this object
2216          *
2217          * @param $name \type{\string} the text
2218          * @return \type{\string} the prefixed text
2219          * @private
2220          */
2221         /* private */ function prefix( $name ) {
2222                 $p = '';
2223                 if ( $this->mInterwiki != '' ) {
2224                         $p = $this->mInterwiki . ':';
2225                 }
2226                 if ( 0 != $this->mNamespace ) {
2227                         $p .= $this->getNsText() . ':';
2228                 }
2229                 return $p . $name;
2230         }
2231
2232         // Returns a simple regex that will match on characters and sequences invalid in titles.
2233         //  Note that this doesn't pick up many things that could be wrong with titles, but that
2234         //  replacing this regex with something valid will make many titles valid.
2235         static function getTitleInvalidRegex() {
2236                 static $rxTc = false;
2237                 if( !$rxTc ) {
2238                         # Matching titles will be held as illegal.
2239                         $rxTc = '/' .
2240                                 # Any character not allowed is forbidden...
2241                                 '[^' . Title::legalChars() . ']' .
2242                                 # URL percent encoding sequences interfere with the ability
2243                                 # to round-trip titles -- you can't link to them consistently.
2244                                 '|%[0-9A-Fa-f]{2}' .
2245                                 # XML/HTML character references produce similar issues.
2246                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2247                                 '|&#[0-9]+;' .
2248                                 '|&#x[0-9A-Fa-f]+;' .
2249                                 '/S';
2250                 }
2251
2252                 return $rxTc;
2253         }
2254
2255         /**
2256          * Capitalize a text if it belongs to a namespace that capitalizes
2257          */
2258         public static function capitalize( $text, $ns = NS_MAIN ) {
2259                 global $wgContLang;
2260
2261                 if ( MWNamespace::isCapitalized( $ns ) )
2262                         return $wgContLang->ucfirst( $text );
2263                 else
2264                         return $text;
2265         }
2266
2267         /**
2268          * Secure and split - main initialisation function for this object
2269          *
2270          * Assumes that mDbkeyform has been set, and is urldecoded
2271          * and uses underscores, but not otherwise munged.  This function
2272          * removes illegal characters, splits off the interwiki and
2273          * namespace prefixes, sets the other forms, and canonicalizes
2274          * everything.
2275          * @return \type{\bool} true on success
2276          */
2277         private function secureAndSplit() {
2278                 global $wgContLang, $wgLocalInterwiki;
2279
2280                 # Initialisation
2281                 $rxTc = self::getTitleInvalidRegex();
2282
2283                 $this->mInterwiki = $this->mFragment = '';
2284                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2285
2286                 $dbkey = $this->mDbkeyform;
2287
2288                 # Strip Unicode bidi override characters.
2289                 # Sometimes they slip into cut-n-pasted page titles, where the
2290                 # override chars get included in list displays.
2291                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2292
2293                 # Clean up whitespace
2294                 # Note: use of the /u option on preg_replace here will cause
2295                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2296                 # conveniently disabling them.
2297                 #
2298                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2299                 $dbkey = trim( $dbkey, '_' );
2300
2301                 if ( $dbkey == '' ) {
2302                         return false;
2303                 }
2304
2305                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2306                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2307                         return false;
2308                 }
2309
2310                 $this->mDbkeyform = $dbkey;
2311
2312                 # Initial colon indicates main namespace rather than specified default
2313                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2314                 if ( ':' == $dbkey{0} ) {
2315                         $this->mNamespace = NS_MAIN;
2316                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2317                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2318                 }
2319
2320                 # Namespace or interwiki prefix
2321                 $firstPass = true;
2322                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2323                 do {
2324                         $m = array();
2325                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2326                                 $p = $m[1];
2327                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2328                                         # Ordinary namespace
2329                                         $dbkey = $m[2];
2330                                         $this->mNamespace = $ns;
2331                                         # For Talk:X pages, check if X has a "namespace" prefix
2332                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2333                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2334                                                         return false; # Disallow Talk:File:x type titles...
2335                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2336                                                         return false; # Disallow Talk:Interwiki:x type titles...
2337                                         }
2338                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2339                                         if( !$firstPass ) {
2340                                                 # Can't make a local interwiki link to an interwiki link.
2341                                                 # That's just crazy!
2342                                                 return false;
2343                                         }
2344
2345                                         # Interwiki link
2346                                         $dbkey = $m[2];
2347                                         $this->mInterwiki = $wgContLang->lc( $p );
2348
2349                                         # Redundant interwiki prefix to the local wiki
2350                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2351                                                 if( $dbkey == '' ) {
2352                                                         # Can't have an empty self-link
2353                                                         return false;
2354                                                 }
2355                                                 $this->mInterwiki = '';
2356                                                 $firstPass = false;
2357                                                 # Do another namespace split...
2358                                                 continue;
2359                                         }
2360
2361                                         # If there's an initial colon after the interwiki, that also
2362                                         # resets the default namespace
2363                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2364                                                 $this->mNamespace = NS_MAIN;
2365                                                 $dbkey = substr( $dbkey, 1 );
2366                                         }
2367                                 }
2368                                 # If there's no recognized interwiki or namespace,
2369                                 # then let the colon expression be part of the title.
2370                         }
2371                         break;
2372                 } while( true );
2373
2374                 # We already know that some pages won't be in the database!
2375                 #
2376                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
2377                         $this->mArticleID = 0;
2378                 }
2379                 $fragment = strstr( $dbkey, '#' );
2380                 if ( false !== $fragment ) {
2381                         $this->setFragment( $fragment );
2382                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2383                         # remove whitespace again: prevents "Foo_bar_#"
2384                         # becoming "Foo_bar_"
2385                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2386                 }
2387
2388                 # Reject illegal characters.
2389                 #
2390                 if( preg_match( $rxTc, $dbkey ) ) {
2391                         return false;
2392                 }
2393
2394                 /**
2395                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2396                  * reachable due to the way web browsers deal with 'relative' URLs.
2397                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2398                  */
2399                 if ( strpos( $dbkey, '.' ) !== false &&
2400                      ( $dbkey === '.' || $dbkey === '..' ||
2401                        strpos( $dbkey, './' ) === 0  ||
2402                        strpos( $dbkey, '../' ) === 0 ||
2403                        strpos( $dbkey, '/./' ) !== false ||
2404                        strpos( $dbkey, '/../' ) !== false  ||
2405                        substr( $dbkey, -2 ) == '/.' ||
2406                        substr( $dbkey, -3 ) == '/..' ) )
2407                 {
2408                         return false;
2409                 }
2410
2411                 /**
2412                  * Magic tilde sequences? Nu-uh!
2413                  */
2414                 if( strpos( $dbkey, '~~~' ) !== false ) {
2415                         return false;
2416                 }
2417
2418                 /**
2419                  * Limit the size of titles to 255 bytes.
2420                  * This is typically the size of the underlying database field.
2421                  * We make an exception for special pages, which don't need to be stored
2422                  * in the database, and may edge over 255 bytes due to subpage syntax
2423                  * for long titles, e.g. [[Special:Block/Long name]]
2424                  */
2425                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2426                   strlen( $dbkey ) > 512 )
2427                 {
2428                         return false;
2429                 }
2430
2431                 /**
2432                  * Normally, all wiki links are forced to have
2433                  * an initial capital letter so [[foo]] and [[Foo]]
2434                  * point to the same place.
2435                  *
2436                  * Don't force it for interwikis, since the other
2437                  * site might be case-sensitive.
2438                  */
2439                 $this->mUserCaseDBKey = $dbkey;
2440                 if(  $this->mInterwiki == '') {
2441                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
2442                 }
2443
2444                 /**
2445                  * Can't make a link to a namespace alone...
2446                  * "empty" local links can only be self-links
2447                  * with a fragment identifier.
2448                  */
2449                 if( $dbkey == '' &&
2450                         $this->mInterwiki == '' &&
2451                         $this->mNamespace != NS_MAIN ) {
2452                         return false;
2453                 }
2454                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2455                 // IP names are not allowed for accounts, and can only be referring to
2456                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2457                 // there are numerous ways to present the same IP. Having sp:contribs scan
2458                 // them all is silly and having some show the edits and others not is
2459                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2460                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2461                         IP::sanitizeIP( $dbkey ) : $dbkey;
2462                 // Any remaining initial :s are illegal.
2463                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2464                         return false;
2465                 }
2466
2467                 # Fill fields
2468                 $this->mDbkeyform = $dbkey;
2469                 $this->mUrlform = wfUrlencode( $dbkey );
2470
2471                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2472
2473                 return true;
2474         }
2475
2476         /**
2477          * Set the fragment for this title. Removes the first character from the
2478          * specified fragment before setting, so it assumes you're passing it with
2479          * an initial "#".
2480          *
2481          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2482          * Still in active use privately.
2483          *
2484          * @param $fragment \type{\string} text
2485          */
2486         public function setFragment( $fragment ) {
2487                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2488         }
2489
2490         /**
2491          * Get a Title object associated with the talk page of this article
2492          * @return \type{Title} the object for the talk page
2493          */
2494         public function getTalkPage() {
2495                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2496         }
2497
2498         /**
2499          * Get a title object associated with the subject page of this
2500          * talk page
2501          *
2502          * @return \type{Title} the object for the subject page
2503          */
2504         public function getSubjectPage() {
2505                 // Is this the same title?
2506                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2507                 if( $this->getNamespace() == $subjectNS ) {
2508                         return $this;
2509                 }
2510                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2511         }
2512
2513         /**
2514          * Get an array of Title objects linking to this Title
2515          * Also stores the IDs in the link cache.
2516          *
2517          * WARNING: do not use this function on arbitrary user-supplied titles!
2518          * On heavily-used templates it will max out the memory.
2519          *
2520          * @param array $options may be FOR UPDATE
2521          * @return \type{\arrayof{Title}} the Title objects linking here
2522          */
2523         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2524                 $linkCache = LinkCache::singleton();
2525
2526                 if ( count( $options ) > 0 ) {
2527                         $db = wfGetDB( DB_MASTER );
2528                 } else {
2529                         $db = wfGetDB( DB_SLAVE );
2530                 }
2531
2532                 $res = $db->select( array( 'page', $table ),
2533                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2534                         array(
2535                                 "{$prefix}_from=page_id",
2536                                 "{$prefix}_namespace" => $this->getNamespace(),
2537                                 "{$prefix}_title"     => $this->getDBkey() ),
2538                         __METHOD__,
2539                         $options );
2540
2541                 $retVal = array();
2542                 if ( $db->numRows( $res ) ) {
2543                         foreach( $res as $row ) {
2544                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2545                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2546                                         $retVal[] = $titleObj;
2547                                 }
2548                         }
2549                 }
2550                 $db->freeResult( $res );
2551                 return $retVal;
2552         }
2553
2554         /**
2555          * Get an array of Title objects using this Title as a template
2556          * Also stores the IDs in the link cache.
2557          *
2558          * WARNING: do not use this function on arbitrary user-supplied titles!
2559          * On heavily-used templates it will max out the memory.
2560          *
2561          * @param array $options may be FOR UPDATE
2562          * @return \type{\arrayof{Title}} the Title objects linking here
2563          */
2564         public function getTemplateLinksTo( $options = array() ) {
2565                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2566         }
2567
2568         /**
2569          * Get an array of Title objects referring to non-existent articles linked from this page
2570          *
2571          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2572          * @return \type{\arrayof{Title}} the Title objects
2573          */
2574         public function getBrokenLinksFrom() {
2575                 if ( $this->getArticleId() == 0 ) {
2576                         # All links from article ID 0 are false positives
2577                         return array();
2578                 }
2579
2580                 $dbr = wfGetDB( DB_SLAVE );
2581                 $res = $dbr->select(
2582                         array( 'page', 'pagelinks' ),
2583                         array( 'pl_namespace', 'pl_title' ),
2584                         array(
2585                                 'pl_from' => $this->getArticleId(),
2586                                 'page_namespace IS NULL'
2587                         ),
2588                         __METHOD__, array(),
2589                         array(
2590                                 'page' => array(
2591                                         'LEFT JOIN',
2592                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2593                                 )
2594                         )
2595                 );
2596
2597                 $retVal = array();
2598                 foreach( $res as $row ) {
2599                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2600                 }
2601                 return $retVal;
2602         }
2603
2604
2605         /**
2606          * Get a list of URLs to purge from the Squid cache when this
2607          * page changes
2608          *
2609          * @return \type{\arrayof{\string}} the URLs
2610          */
2611         public function getSquidURLs() {
2612                 global $wgContLang;
2613
2614                 $urls = array(
2615                         $this->getInternalURL(),
2616                         $this->getInternalURL( 'action=history' )
2617                 );
2618
2619                 // purge variant urls as well
2620                 if($wgContLang->hasVariants()){
2621                         $variants = $wgContLang->getVariants();
2622                         foreach($variants as $vCode){
2623                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2624                                 $urls[] = $this->getInternalURL('',$vCode);
2625                         }
2626                 }
2627
2628                 return $urls;
2629         }
2630
2631         /**
2632          * Purge all applicable Squid URLs
2633          */
2634         public function purgeSquid() {
2635                 global $wgUseSquid;
2636                 if ( $wgUseSquid ) {
2637                         $urls = $this->getSquidURLs();
2638                         $u = new SquidUpdate( $urls );
2639                         $u->doUpdate();
2640                 }
2641         }
2642
2643         /**
2644          * Move this page without authentication
2645          * @param &$nt \type{Title} the new page Title
2646          */
2647         public function moveNoAuth( &$nt ) {
2648                 return $this->moveTo( $nt, false );
2649         }
2650
2651         /**
2652          * Check whether a given move operation would be valid.
2653          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2654          * @param &$nt \type{Title} the new title
2655          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2656          *  should be checked
2657          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2658          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2659          */
2660         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2661                 global $wgUser;
2662
2663                 $errors = array();
2664                 if( !$nt ) {
2665                         // Normally we'd add this to $errors, but we'll get
2666                         // lots of syntax errors if $nt is not an object
2667                         return array(array('badtitletext'));
2668                 }
2669                 if( $this->equals( $nt ) ) {
2670                         $errors[] = array('selfmove');
2671                 }
2672                 if( !$this->isMovable() ) {
2673                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2674                 }
2675                 if ( $nt->getInterwiki() != '' ) {
2676                         $errors[] = array( 'immobile-target-namespace-iw' );
2677                 }
2678                 if ( !$nt->isMovable() ) {
2679                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2680                 }
2681
2682                 $oldid = $this->getArticleID();
2683                 $newid = $nt->getArticleID();
2684
2685                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2686                         $errors[] = array('articleexists');
2687                 }
2688                 if ( ( $this->getDBkey() == '' ) ||
2689                          ( !$oldid ) ||
2690                      ( $nt->getDBkey() == '' ) ) {
2691                         $errors[] = array('badarticleerror');
2692                 }
2693
2694                 // Image-specific checks
2695                 if( $this->getNamespace() == NS_FILE ) {
2696                         $file = wfLocalFile( $this );
2697                         if( $file->exists() ) {
2698                                 if( $nt->getNamespace() != NS_FILE ) {
2699                                         $errors[] = array('imagenocrossnamespace');
2700                                 }
2701                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2702                                         $errors[] = array('imageinvalidfilename');
2703                                 }
2704                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2705                                         $errors[] = array('imagetypemismatch');
2706                                 }
2707                         }
2708                         $destfile = wfLocalFile( $nt );
2709                         if( !$wgUser->isAllowed( 'reupload-shared' ) && !$destfile->exists() && wfFindFile( $nt ) ) {
2710                                 $errors[] = array( 'file-exists-sharedrepo' );
2711                         }
2712
2713                 }
2714
2715                 if ( $auth ) {
2716                         $errors = wfMergeErrorArrays( $errors,
2717                                 $this->getUserPermissionsErrors('move', $wgUser),
2718                                 $this->getUserPermissionsErrors('edit', $wgUser),
2719                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2720                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2721                 }
2722
2723                 $match = EditPage::matchSummarySpamRegex( $reason );
2724                 if( $match !== false ) {
2725                         // This is kind of lame, won't display nice
2726                         $errors[] = array('spamprotectiontext');
2727                 }
2728
2729                 $err = null;
2730                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2731                         $errors[] = array('hookaborted', $err);
2732                 }
2733
2734                 # The move is allowed only if (1) the target doesn't exist, or
2735                 # (2) the target is a redirect to the source, and has no history
2736                 # (so we can undo bad moves right after they're done).
2737
2738                 if ( 0 != $newid ) { # Target exists; check for validity
2739                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2740                                 $errors[] = array('articleexists');
2741                         }
2742                 } else {
2743                         $tp = $nt->getTitleProtection();
2744                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2745                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2746                                 $errors[] = array('cantmove-titleprotected');
2747                         }
2748                 }
2749                 if(empty($errors))
2750                         return true;
2751                 return $errors;
2752         }
2753
2754         /**
2755          * Move a title to a new location
2756          * @param &$nt \type{Title} the new title
2757          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2758          *  should be checked
2759          * @param $reason \type{\string} The reason for the move
2760          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2761          *  Ignored if the user doesn't have the suppressredirect right.
2762          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2763          */
2764         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2765                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2766                 if( is_array( $err ) ) {
2767                         return $err;
2768                 }
2769
2770                 // If it is a file, move it first. It is done before all other moving stuff is done because it's hard to revert
2771                 $dbw = wfGetDB( DB_MASTER );
2772                 if( $this->getNamespace() == NS_FILE ) {
2773                         $file = wfLocalFile( $this );
2774                         if( $file->exists() ) {
2775                                 $status = $file->move( $nt );
2776                                 if( !$status->isOk() ) {
2777                                         return $status->getErrorsArray();
2778                                 }
2779                         }
2780                 }
2781
2782                 $pageid = $this->getArticleID();
2783                 $protected = $this->isProtected();
2784                 if( $nt->exists() ) {
2785                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2786                         $pageCountChange = ($createRedirect ? 0 : -1);
2787                 } else { # Target didn't exist, do normal move.
2788                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2789                         $pageCountChange = ($createRedirect ? 1 : 0);
2790                 }
2791
2792                 if( is_array( $err ) ) {
2793                         return $err;
2794                 }
2795                 $redirid = $this->getArticleID();
2796
2797                 // Category memberships include a sort key which may be customized.
2798                 // If it's left as the default (the page title), we need to update
2799                 // the sort key to match the new title.
2800                 //
2801                 // Be careful to avoid resetting cl_timestamp, which may disturb
2802                 // time-based lists on some sites.
2803                 //
2804                 // Warning -- if the sort key is *explicitly* set to the old title,
2805                 // we can't actually distinguish it from a default here, and it'll
2806                 // be set to the new title even though it really shouldn't.
2807                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2808                 $dbw->update( 'categorylinks',
2809                         array(
2810                                 'cl_sortkey' => $nt->getPrefixedText(),
2811                                 'cl_timestamp=cl_timestamp' ),
2812                         array(
2813                                 'cl_from' => $pageid,
2814                                 'cl_sortkey' => $this->getPrefixedText() ),
2815                         __METHOD__ );
2816
2817                 if( $protected ) {
2818                         # Protect the redirect title as the title used to be...
2819                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2820                                 array(
2821                                         'pr_page'    => $redirid,
2822                                         'pr_type'    => 'pr_type',
2823                                         'pr_level'   => 'pr_level',
2824                                         'pr_cascade' => 'pr_cascade',
2825                                         'pr_user'    => 'pr_user',
2826                                         'pr_expiry'  => 'pr_expiry'
2827                                 ),
2828                                 array( 'pr_page' => $pageid ),
2829                                 __METHOD__,
2830                                 array( 'IGNORE' )
2831                         );
2832                         # Update the protection log
2833                         $log = new LogPage( 'protect' );
2834                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2835                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2836                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2837                 }
2838
2839                 # Update watchlists
2840                 $oldnamespace = $this->getNamespace() & ~1;
2841                 $newnamespace = $nt->getNamespace() & ~1;
2842                 $oldtitle = $this->getDBkey();
2843                 $newtitle = $nt->getDBkey();
2844
2845                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2846                         WatchedItem::duplicateEntries( $this, $nt );
2847                 }
2848
2849                 # Update search engine
2850                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2851                 $u->doUpdate();
2852                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2853                 $u->doUpdate();
2854
2855                 # Update site_stats
2856                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2857                         # No longer a content page
2858                         # Not viewed, edited, removing
2859                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2860                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2861                         # Now a content page
2862                         # Not viewed, edited, adding
2863                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2864                 } elseif( $pageCountChange ) {
2865                         # Redirect added
2866                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2867                 } else {
2868                         # Nothing special
2869                         $u = false;
2870                 }
2871                 if( $u )
2872                         $u->doUpdate();
2873                 # Update message cache for interface messages
2874                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2875                         global $wgMessageCache;
2876
2877                         # @bug 17860: old article can be deleted, if this the case,
2878                         # delete it from message cache
2879                         if ( $this->getArticleID() === 0 ) {
2880                                 $wgMessageCache->replace( $this->getDBkey(), false );
2881                         } else {
2882                                 $oldarticle = new Article( $this );
2883                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2884                         }
2885
2886                         $newarticle = new Article( $nt );
2887                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2888                 }
2889
2890                 global $wgUser;
2891                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2892                 return true;
2893         }
2894
2895         /**
2896          * Move page to a title which is at present a redirect to the
2897          * source page
2898          *
2899          * @param &$nt \type{Title} the page to move to, which should currently
2900          *  be a redirect
2901          * @param $reason \type{\string} The reason for the move
2902          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2903          *  Ignored if the user doesn't have the suppressredirect right
2904          */
2905         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2906                 global $wgUseSquid, $wgUser, $wgContLang;
2907
2908                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2909
2910                 if ( $reason ) {
2911                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2912                 }
2913                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
2914                 $comment = $wgContLang->truncate( $comment, 250 );
2915
2916                 $now = wfTimestampNow();
2917                 $newid = $nt->getArticleID();
2918                 $oldid = $this->getArticleID();
2919                 $latest = $this->getLatestRevID();
2920
2921                 $dbw = wfGetDB( DB_MASTER );
2922
2923                 $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
2924                 $newns = $nt->getNamespace();
2925                 $newdbk = $nt->getDBkey();
2926
2927                 # Delete the old redirect. We don't save it to history since
2928                 # by definition if we've got here it's rather uninteresting.
2929                 # We have to remove it so that the next step doesn't trigger
2930                 # a conflict on the unique namespace+title index...
2931                 $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
2932                 if ( !$dbw->cascadingDeletes() ) {
2933                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2934                         global $wgUseTrackbacks;
2935                         if ($wgUseTrackbacks)
2936                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2937                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2938                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2939                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2940                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2941                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2942                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2943                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2944                 }
2945                 // If the redirect was recently created, it may have an entry in recentchanges still
2946                 $dbw->delete( 'recentchanges',
2947                         array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
2948                         __METHOD__
2949                 );
2950
2951                 # Save a null revision in the page's history notifying of the move
2952                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2953                 $nullRevId = $nullRevision->insertOn( $dbw );
2954
2955                 $article = new Article( $this );
2956                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2957
2958                 # Change the name of the target page:
2959                 $dbw->update( 'page',
2960                         /* SET */ array(
2961                                 'page_touched'   => $dbw->timestamp($now),
2962                                 'page_namespace' => $nt->getNamespace(),
2963                                 'page_title'     => $nt->getDBkey(),
2964                                 'page_latest'    => $nullRevId,
2965                         ),
2966                         /* WHERE */ array( 'page_id' => $oldid ),
2967                         __METHOD__
2968                 );
2969                 $nt->resetArticleID( $oldid );
2970
2971                 # Recreate the redirect, this time in the other direction.
2972                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2973                         $mwRedir = MagicWord::get( 'redirect' );
2974                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2975                         $redirectArticle = new Article( $this );
2976                         $newid = $redirectArticle->insertOn( $dbw );
2977                         $redirectRevision = new Revision( array(
2978                                 'page'    => $newid,
2979                                 'comment' => $comment,
2980                                 'text'    => $redirectText ) );
2981                         $redirectRevision->insertOn( $dbw );
2982                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2983
2984                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2985
2986                         # Now, we record the link from the redirect to the new title.
2987                         # It should have no other outgoing links...
2988                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2989                         $dbw->insert( 'pagelinks',
2990                                 array(
2991                                         'pl_from'      => $newid,
2992                                         'pl_namespace' => $nt->getNamespace(),
2993                                         'pl_title'     => $nt->getDBkey() ),
2994                                 __METHOD__ );
2995                         $redirectSuppressed = false;
2996                 } else {
2997                         $this->resetArticleID( 0 );
2998                         $redirectSuppressed = true;
2999                 }
3000
3001                 # Log the move
3002                 $log = new LogPage( 'move' );
3003                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3004
3005                 # Purge squid
3006                 if ( $wgUseSquid ) {
3007                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
3008                         $u = new SquidUpdate( $urls );
3009                         $u->doUpdate();
3010                 }
3011
3012         }
3013
3014         /**
3015          * Move page to non-existing title.
3016          * @param &$nt \type{Title} the new Title
3017          * @param $reason \type{\string} The reason for the move
3018          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
3019          *  Ignored if the user doesn't have the suppressredirect right
3020          */
3021         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
3022                 global $wgUseSquid, $wgUser, $wgContLang;
3023
3024                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3025                 if ( $reason ) {
3026                         $comment .= wfMsgExt( 'colon-separator',
3027                                 array( 'escapenoentities', 'content' ) );
3028                         $comment .= $reason;
3029                 }
3030                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
3031                 $comment = $wgContLang->truncate( $comment, 250 );
3032
3033                 $newid = $nt->getArticleID();
3034                 $oldid = $this->getArticleID();
3035                 $latest = $this->getLatestRevId();
3036
3037                 $dbw = wfGetDB( DB_MASTER );
3038                 $now = $dbw->timestamp();
3039
3040                 # Save a null revision in the page's history notifying of the move
3041                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3042                 if ( !is_object( $nullRevision ) ) {
3043                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3044                 }
3045                 $nullRevId = $nullRevision->insertOn( $dbw );
3046
3047                 $article = new Article( $this );
3048                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
3049
3050                 # Rename page entry
3051                 $dbw->update( 'page',
3052                         /* SET */ array(
3053                                 'page_touched'   => $now,
3054                                 'page_namespace' => $nt->getNamespace(),
3055                                 'page_title'     => $nt->getDBkey(),
3056                                 'page_latest'    => $nullRevId,
3057                         ),
3058                         /* WHERE */ array( 'page_id' => $oldid ),
3059                         __METHOD__
3060                 );
3061                 $nt->resetArticleID( $oldid );
3062
3063                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3064                         # Insert redirect
3065                         $mwRedir = MagicWord::get( 'redirect' );
3066                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3067                         $redirectArticle = new Article( $this );
3068                         $newid = $redirectArticle->insertOn( $dbw );
3069                         $redirectRevision = new Revision( array(
3070                                 'page'    => $newid,
3071                                 'comment' => $comment,
3072                                 'text'    => $redirectText ) );
3073                         $redirectRevision->insertOn( $dbw );
3074                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3075
3076                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3077
3078                         # Record the just-created redirect's linking to the page
3079                         $dbw->insert( 'pagelinks',
3080                                 array(
3081                                         'pl_from'      => $newid,
3082                                         'pl_namespace' => $nt->getNamespace(),
3083                                         'pl_title'     => $nt->getDBkey() ),
3084                                 __METHOD__ );
3085                         $redirectSuppressed = false;
3086                 } else {
3087                         $this->resetArticleID( 0 );
3088                         $redirectSuppressed = true;
3089                 }
3090
3091                 # Log the move
3092                 $log = new LogPage( 'move' );
3093                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3094
3095                 # Purge caches as per article creation
3096                 Article::onArticleCreate( $nt );
3097
3098                 # Purge old title from squid
3099                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
3100                 $this->purgeSquid();
3101
3102         }
3103
3104         /**
3105          * Move this page's subpages to be subpages of $nt
3106          * @param $nt Title Move target
3107          * @param $auth bool Whether $wgUser's permissions should be checked
3108          * @param $reason string The reason for the move
3109          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
3110          *  Ignored if the user doesn't have the 'suppressredirect' right
3111          * @return mixed array with old page titles as keys, and strings (new page titles) or
3112          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
3113          */
3114         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3115                 global $wgMaximumMovedPages;
3116                 // Check permissions
3117                 if( !$this->userCan( 'move-subpages' ) )
3118                         return array( 'cant-move-subpages' );
3119                 // Do the source and target namespaces support subpages?
3120                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
3121                         return array( 'namespace-nosubpages',
3122                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3123                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
3124                         return array( 'namespace-nosubpages',
3125                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3126
3127                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
3128                 $retval = array();
3129                 $count = 0;
3130                 foreach( $subpages as $oldSubpage ) {
3131                         $count++;
3132                         if( $count > $wgMaximumMovedPages ) {
3133                                 $retval[$oldSubpage->getPrefixedTitle()] =
3134                                                 array( 'movepage-max-pages',
3135                                                         $wgMaximumMovedPages );
3136                                 break;
3137                         }
3138
3139                         // We don't know whether this function was called before
3140                         // or after moving the root page, so check both
3141                         // $this and $nt
3142                         if( $oldSubpage->getArticleId() == $this->getArticleId() ||
3143                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3144                                 // When moving a page to a subpage of itself,
3145                                 // don't move it twice
3146                                 continue;
3147                         $newPageName = preg_replace(
3148                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
3149                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3150                                         $oldSubpage->getDBkey() );
3151                         if( $oldSubpage->isTalkPage() ) {
3152                                 $newNs = $nt->getTalkPage()->getNamespace();
3153                         } else {
3154                                 $newNs = $nt->getSubjectPage()->getNamespace();
3155                         }
3156                         # Bug 14385: we need makeTitleSafe because the new page names may
3157                         # be longer than 255 characters.
3158                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3159
3160                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3161                         if( $success === true ) {
3162                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3163                         } else {
3164                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3165                         }
3166                 }
3167                 return $retval;
3168         }
3169
3170         /**
3171          * Checks if this page is just a one-rev redirect.
3172          * Adds lock, so don't use just for light purposes.
3173          *
3174          * @return \type{\bool} TRUE or FALSE
3175          */
3176         public function isSingleRevRedirect() {
3177                 $dbw = wfGetDB( DB_MASTER );
3178                 # Is it a redirect?
3179                 $row = $dbw->selectRow( 'page',
3180                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3181                         $this->pageCond(),
3182                         __METHOD__,
3183                         array( 'FOR UPDATE' )
3184                 );
3185                 # Cache some fields we may want
3186                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3187                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3188                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3189                 if( !$this->mRedirect ) {
3190                         return false;
3191                 }
3192                 # Does the article have a history?
3193                 $row = $dbw->selectField( array( 'page', 'revision'),
3194                         'rev_id',
3195                         array( 'page_namespace' => $this->getNamespace(),
3196                                 'page_title' => $this->getDBkey(),
3197                                 'page_id=rev_page',
3198                                 'page_latest != rev_id'
3199                         ),
3200                         __METHOD__,
3201                         array( 'FOR UPDATE' )
3202                 );
3203                 # Return true if there was no history
3204                 return ($row === false);
3205         }
3206
3207         /**
3208          * Checks if $this can be moved to a given Title
3209          * - Selects for update, so don't call it unless you mean business
3210          *
3211          * @param &$nt \type{Title} the new title to check
3212          * @return \type{\bool} TRUE or FALSE
3213          */
3214         public function isValidMoveTarget( $nt ) {
3215                 $dbw = wfGetDB( DB_MASTER );
3216                 # Is it an existsing file?
3217                 if( $nt->getNamespace() == NS_FILE ) {
3218                         $file = wfLocalFile( $nt );
3219                         if( $file->exists() ) {
3220                                 wfDebug( __METHOD__ . ": file exists\n" );
3221                                 return false;
3222                         }
3223                 }
3224                 # Is it a redirect with no history?
3225                 if( !$nt->isSingleRevRedirect() ) {
3226                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3227                         return false;
3228                 }
3229                 # Get the article text
3230                 $rev = Revision::newFromTitle( $nt );
3231                 $text = $rev->getText();
3232                 # Does the redirect point to the source?
3233                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3234                 $m = array();
3235                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3236                         $redirTitle = Title::newFromText( $m[1] );
3237                         if( !is_object( $redirTitle ) ||
3238                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3239                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3240                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3241                                 return false;
3242                         }
3243                 } else {
3244                         # Fail safe
3245                         wfDebug( __METHOD__ . ": failsafe\n" );
3246                         return false;
3247                 }
3248                 return true;
3249         }
3250
3251         /**
3252          * Can this title be added to a user's watchlist?
3253          *
3254          * @return \type{\bool} TRUE or FALSE
3255          */
3256         public function isWatchable() {
3257                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3258         }
3259
3260         /**
3261          * Get categories to which this Title belongs and return an array of
3262          * categories' names.
3263          *
3264          * @return \type{\array} array an array of parents in the form:
3265          *      $parent => $currentarticle
3266          */
3267         public function getParentCategories() {
3268                 global $wgContLang;
3269
3270                 $titlekey = $this->getArticleId();
3271                 $dbr = wfGetDB( DB_SLAVE );
3272                 $categorylinks = $dbr->tableName( 'categorylinks' );
3273
3274                 # NEW SQL
3275                 $sql = "SELECT * FROM $categorylinks"
3276                      ." WHERE cl_from='$titlekey'"
3277                          ." AND cl_from <> '0'"
3278                          ." ORDER BY cl_sortkey";
3279
3280                 $res = $dbr->query( $sql );
3281
3282                 if( $dbr->numRows( $res ) > 0 ) {
3283                         foreach( $res as $row )
3284                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3285                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3286                         $dbr->freeResult( $res );
3287                 } else {
3288                         $data = array();
3289                 }
3290                 return $data;
3291         }
3292
3293         /**
3294          * Get a tree of parent categories
3295          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3296          * @return \type{\array} Tree of parent categories
3297          */
3298         public function getParentCategoryTree( $children = array() ) {
3299                 $stack = array();
3300                 $parents = $this->getParentCategories();
3301
3302                 if( $parents ) {
3303                         foreach( $parents as $parent => $current ) {
3304                                 if ( array_key_exists( $parent, $children ) ) {
3305                                         # Circular reference
3306                                         $stack[$parent] = array();
3307                                 } else {
3308                                         $nt = Title::newFromText($parent);
3309                                         if ( $nt ) {
3310                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3311                                         }
3312                                 }
3313                         }
3314                         return $stack;
3315                 } else {
3316                         return array();
3317                 }
3318         }
3319
3320
3321         /**
3322          * Get an associative array for selecting this title from
3323          * the "page" table
3324          *
3325          * @return \type{\array} Selection array
3326          */
3327         public function pageCond() {
3328                 if( $this->mArticleID > 0 ) {
3329                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3330                         return array( 'page_id' => $this->mArticleID );
3331                 } else {
3332                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3333                 }
3334         }
3335
3336         /**
3337          * Get the revision ID of the previous revision
3338          *
3339          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3340          * @param $flags \type{\int} GAID_FOR_UPDATE
3341          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3342          */
3343         public function getPreviousRevisionID( $revId, $flags=0 ) {
3344                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3345                 return $db->selectField( 'revision', 'rev_id',
3346                         array(
3347                                 'rev_page' => $this->getArticleId($flags),
3348                                 'rev_id < ' . intval( $revId )
3349                         ),
3350                         __METHOD__,
3351                         array( 'ORDER BY' => 'rev_id DESC' )
3352                 );
3353         }
3354
3355         /**
3356          * Get the revision ID of the next revision
3357          *
3358          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3359          * @param $flags \type{\int} GAID_FOR_UPDATE
3360          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3361          */
3362         public function getNextRevisionID( $revId, $flags=0 ) {
3363                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3364                 return $db->selectField( 'revision', 'rev_id',
3365                         array(
3366                                 'rev_page' => $this->getArticleId($flags),
3367                                 'rev_id > ' . intval( $revId )
3368                         ),
3369                         __METHOD__,
3370                         array( 'ORDER BY' => 'rev_id' )
3371                 );
3372         }
3373
3374         /**
3375          * Get the first revision of the page
3376          *
3377          * @param $flags \type{\int} GAID_FOR_UPDATE
3378          * @return Revision (or NULL if page doesn't exist)
3379          */
3380         public function getFirstRevision( $flags=0 ) {
3381                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3382                 $pageId = $this->getArticleId($flags);
3383                 if( !$pageId ) return null;
3384                 $row = $db->selectRow( 'revision', '*',
3385                         array( 'rev_page' => $pageId ),
3386                         __METHOD__,
3387                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3388                 );
3389                 if( !$row ) {
3390                         return null;
3391                 } else {
3392                         return new Revision( $row );
3393                 }
3394         }
3395
3396         /**
3397          * Check if this is a new page
3398          *
3399          * @return bool
3400          */
3401         public function isNewPage() {
3402                 $dbr = wfGetDB( DB_SLAVE );
3403                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3404         }
3405
3406         /**
3407          * Get the oldest revision timestamp of this page
3408          *
3409          * @return string, MW timestamp
3410          */
3411         public function getEarliestRevTime() {
3412                 $dbr = wfGetDB( DB_SLAVE );
3413                 if( $this->exists() ) {
3414                         $min = $dbr->selectField( 'revision',
3415                                 'MIN(rev_timestamp)',
3416                                 array( 'rev_page' => $this->getArticleId() ),
3417                                 __METHOD__ );
3418                         return wfTimestampOrNull( TS_MW, $min );
3419                 }
3420                 return null;
3421         }
3422
3423         /**
3424          * Get the number of revisions between the given revision IDs.
3425          * Used for diffs and other things that really need it.
3426          *
3427          * @param $old \type{\int} Revision ID.
3428          * @param $new \type{\int} Revision ID.
3429          * @return \type{\int} Number of revisions between these IDs.
3430          */
3431         public function countRevisionsBetween( $old, $new ) {
3432                 $dbr = wfGetDB( DB_SLAVE );
3433                 return (int)$dbr->selectField( 'revision', 'count(*)',
3434                         'rev_page = ' . intval( $this->getArticleId() ) .
3435                         ' AND rev_id > ' . intval( $old ) .
3436                         ' AND rev_id < ' . intval( $new ),
3437                         __METHOD__
3438                 );
3439         }
3440
3441         /**
3442          * Compare with another title.
3443          *
3444          * @param \type{Title} $title
3445          * @return \type{\bool} TRUE or FALSE
3446          */
3447         public function equals( Title $title ) {
3448                 // Note: === is necessary for proper matching of number-like titles.
3449                 return $this->getInterwiki() === $title->getInterwiki()
3450                         && $this->getNamespace() == $title->getNamespace()
3451                         && $this->getDBkey() === $title->getDBkey();
3452         }
3453
3454         /**
3455          * Callback for usort() to do title sorts by (namespace, title)
3456          */
3457         public static function compare( $a, $b ) {
3458                 if( $a->getNamespace() == $b->getNamespace() ) {
3459                         return strcmp( $a->getText(), $b->getText() );
3460                 } else {
3461                         return $a->getNamespace() - $b->getNamespace();
3462                 }
3463         }
3464
3465         /**
3466          * Return a string representation of this title
3467          *
3468          * @return \type{\string} String representation of this title
3469          */
3470         public function __toString() {
3471                 return $this->getPrefixedText();
3472         }
3473
3474         /**
3475          * Check if page exists.  For historical reasons, this function simply
3476          * checks for the existence of the title in the page table, and will
3477          * thus return false for interwiki links, special pages and the like.
3478          * If you want to know if a title can be meaningfully viewed, you should
3479          * probably call the isKnown() method instead.
3480          *
3481          * @return \type{\bool} TRUE or FALSE
3482          */
3483         public function exists() {
3484                 return $this->getArticleId() != 0;
3485         }
3486
3487         /**
3488          * Should links to this title be shown as potentially viewable (i.e. as
3489          * "bluelinks"), even if there's no record by this title in the page
3490          * table?
3491          *
3492          * This function is semi-deprecated for public use, as well as somewhat
3493          * misleadingly named.  You probably just want to call isKnown(), which
3494          * calls this function internally.
3495          *
3496          * (ISSUE: Most of these checks are cheap, but the file existence check
3497          * can potentially be quite expensive.  Including it here fixes a lot of
3498          * existing code, but we might want to add an optional parameter to skip
3499          * it and any other expensive checks.)
3500          *
3501          * @return \type{\bool} TRUE or FALSE
3502          */
3503         public function isAlwaysKnown() {
3504                 if( $this->mInterwiki != '' ) {
3505                         return true;  // any interwiki link might be viewable, for all we know
3506                 }
3507                 switch( $this->mNamespace ) {
3508                 case NS_MEDIA:
3509                 case NS_FILE:
3510                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3511                 case NS_SPECIAL:
3512                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3513                 case NS_MAIN:
3514                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3515                 case NS_MEDIAWIKI:
3516                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3517                         // the full l10n of that language to be loaded. That takes much memory and
3518                         // isn't needed. So we strip the language part away.
3519                         // Also, extension messages which are not loaded, are shown as red, because
3520                         // we don't call MessageCache::loadAllMessages.
3521                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3522                         return wfMsgWeirdKey( $basename );  // known system message
3523                 default:
3524                         return false;
3525                 }
3526         }
3527
3528         /**
3529          * Does this title refer to a page that can (or might) be meaningfully
3530          * viewed?  In particular, this function may be used to determine if
3531          * links to the title should be rendered as "bluelinks" (as opposed to
3532          * "redlinks" to non-existent pages).
3533          *
3534          * @return \type{\bool} TRUE or FALSE
3535          */
3536         public function isKnown() {
3537                 return $this->exists() || $this->isAlwaysKnown();
3538         }
3539
3540         /**
3541         * Is this in a namespace that allows actual pages?
3542         *
3543         * @return \type{\bool} TRUE or FALSE
3544         */
3545         public function canExist() {
3546                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3547         }
3548
3549         /**
3550          * Update page_touched timestamps and send squid purge messages for
3551          * pages linking to this title. May be sent to the job queue depending
3552          * on the number of links. Typically called on create and delete.
3553          */
3554         public function touchLinks() {
3555                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3556                 $u->doUpdate();
3557
3558                 if ( $this->getNamespace() == NS_CATEGORY ) {
3559                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3560                         $u->doUpdate();
3561                 }
3562         }
3563
3564         /**
3565          * Get the last touched timestamp
3566          * @param Database $db, optional db
3567          * @return \type{\string} Last touched timestamp
3568          */
3569         public function getTouched( $db = null ) {
3570                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3571                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3572                 return $touched;
3573         }
3574
3575         /**
3576          * Get the timestamp when this page was updated since the user last saw it.
3577          * @param User $user
3578          * @return mixed string/NULL
3579          */
3580         public function getNotificationTimestamp( $user = null ) {
3581                 global $wgUser, $wgShowUpdatedMarker;
3582                 // Assume current user if none given
3583                 if( !$user ) $user = $wgUser;
3584                 // Check cache first
3585                 $uid = $user->getId();
3586                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3587                         return $this->mNotificationTimestamp[$uid];
3588                 }
3589                 if( !$uid || !$wgShowUpdatedMarker ) {
3590                         return $this->mNotificationTimestamp[$uid] = false;
3591                 }
3592                 // Don't cache too much!
3593                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3594                         $this->mNotificationTimestamp = array();
3595                 }
3596                 $dbr = wfGetDB( DB_SLAVE );
3597                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3598                         'wl_notificationtimestamp',
3599                         array( 'wl_namespace' => $this->getNamespace(),
3600                                 'wl_title' => $this->getDBkey(),
3601                                 'wl_user' => $user->getId()
3602                         ),
3603                         __METHOD__
3604                 );
3605                 return $this->mNotificationTimestamp[$uid];
3606         }
3607
3608         /**
3609          * Get the trackback URL for this page
3610          * @return \type{\string} Trackback URL
3611          */
3612         public function trackbackURL() {
3613                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3614
3615                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3616                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3617         }
3618
3619         /**
3620          * Get the trackback RDF for this page
3621          * @return \type{\string} Trackback RDF
3622          */
3623         public function trackbackRDF() {
3624                 $url = htmlspecialchars($this->getFullURL());
3625                 $title = htmlspecialchars($this->getText());
3626                 $tburl = $this->trackbackURL();
3627
3628                 // Autodiscovery RDF is placed in comments so HTML validator
3629                 // won't barf. This is a rather icky workaround, but seems
3630                 // frequently used by this kind of RDF thingy.
3631                 //
3632                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3633                 return "<!--
3634 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3635          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3636          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3637 <rdf:Description
3638    rdf:about=\"$url\"
3639    dc:identifier=\"$url\"
3640    dc:title=\"$title\"
3641    trackback:ping=\"$tburl\" />
3642 </rdf:RDF>
3643 -->";
3644         }
3645
3646         /**
3647          * Generate strings used for xml 'id' names in monobook tabs
3648          * @return \type{\string} XML 'id' name
3649          */
3650         public function getNamespaceKey( $prepend = 'nstab-' ) {
3651                 global $wgContLang;
3652                 // Gets the subject namespace if this title
3653                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
3654                 // Checks if cononical namespace name exists for namespace
3655                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
3656                         // Uses canonical namespace name
3657                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
3658                 } else {
3659                         // Uses text of namespace
3660                         $namespaceKey = $this->getSubjectNsText();
3661                 }
3662                 // Makes namespace key lowercase
3663                 $namespaceKey = $wgContLang->lc( $namespaceKey );
3664                 // Uses main
3665                 if ( $namespaceKey == '' ) {
3666                         $namespaceKey = 'main';
3667                 }
3668                 // Changes file to image for backwards compatibility
3669                 if ( $namespaceKey == 'file' ) {
3670                         $namespaceKey = 'image';
3671                 }
3672                 return $prepend . $namespaceKey;
3673         }
3674
3675         /**
3676          * Returns true if this is a special page.
3677          */
3678         public function isSpecialPage( ) {
3679                 return $this->getNamespace() == NS_SPECIAL;
3680         }
3681
3682         /**
3683          * Returns true if this title resolves to the named special page
3684          * @param $name \type{\string} The special page name
3685          */
3686         public function isSpecial( $name ) {
3687                 if ( $this->getNamespace() == NS_SPECIAL ) {
3688                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3689                         if ( $name == $thisName ) {
3690                                 return true;
3691                         }
3692                 }
3693                 return false;
3694         }
3695
3696         /**
3697          * If the Title refers to a special page alias which is not the local default,
3698          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3699          */
3700         public function fixSpecialName() {
3701                 if ( $this->getNamespace() == NS_SPECIAL ) {
3702                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3703                         if ( $canonicalName ) {
3704                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3705                                 if ( $localName != $this->mDbkeyform ) {
3706                                         return Title::makeTitle( NS_SPECIAL, $localName );
3707                                 }
3708                         }
3709                 }
3710                 return $this;
3711         }
3712
3713         /**
3714          * Is this Title in a namespace which contains content?
3715          * In other words, is this a content page, for the purposes of calculating
3716          * statistics, etc?
3717          *
3718          * @return \type{\bool} TRUE or FALSE
3719          */
3720         public function isContentPage() {
3721                 return MWNamespace::isContent( $this->getNamespace() );
3722         }
3723
3724         /**
3725          * Get all extant redirects to this Title
3726          *
3727          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3728          *            NULL to consider all namespaces
3729          * @return \type{\arrayof{Title}} Redirects to this title
3730          */
3731         public function getRedirectsHere( $ns = null ) {
3732                 $redirs = array();
3733
3734                 $dbr = wfGetDB( DB_SLAVE );
3735                 $where = array(
3736                         'rd_namespace' => $this->getNamespace(),
3737                         'rd_title' => $this->getDBkey(),
3738                         'rd_from = page_id'
3739                 );
3740                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3741
3742                 $res = $dbr->select(
3743                         array( 'redirect', 'page' ),
3744                         array( 'page_namespace', 'page_title' ),
3745                         $where,
3746                         __METHOD__
3747                 );
3748
3749
3750                 foreach( $res as $row ) {
3751                         $redirs[] = self::newFromRow( $row );
3752                 }
3753                 return $redirs;
3754         }
3755
3756         /**
3757          * Check if this Title is a valid redirect target
3758          *
3759          * @return \type{\bool} TRUE or FALSE
3760          */
3761         public function isValidRedirectTarget() {
3762                 global $wgInvalidRedirectTargets;
3763
3764                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3765                 if( $this->isSpecial( 'Userlogout' ) ) {
3766                         return false;
3767                 }
3768
3769                 foreach( $wgInvalidRedirectTargets as $target ) {
3770                         if( $this->isSpecial( $target ) ) {
3771                                 return false;
3772                         }
3773                 }
3774
3775                 return true;
3776         }
3777
3778         /**
3779          * Get a backlink cache object
3780          */
3781         function getBacklinkCache() {
3782                 if ( is_null( $this->mBacklinkCache ) ) {
3783                         $this->mBacklinkCache = new BacklinkCache( $this );
3784                 }
3785                 return $this->mBacklinkCache;
3786         }
3787
3788         /**
3789          * Whether the magic words __INDEX__ and __NOINDEX__ function for
3790          * this page.
3791          * @return Bool
3792          */
3793         public function canUseNoindex(){
3794                 global $wgArticleRobotPolicies, $wgContentNamespaces,
3795                        $wgExemptFromUserRobotsControl;
3796
3797                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
3798                         ? $wgContentNamespaces
3799                         : $wgExemptFromUserRobotsControl;
3800
3801                 return !in_array( $this->mNamespace, $bannedNamespaces );
3802
3803         }
3804
3805         public function getRestrictionTypes() {
3806                 global $wgRestrictionTypes;
3807                 $types = $this->exists() ? $wgRestrictionTypes : array('create');
3808
3809                 if ( $this->getNamespace() == NS_FILE ) {
3810                         $types[] = 'upload';
3811                 }
3812
3813                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
3814
3815                 return $types;
3816         }
3817 }