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