includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 if ( !class_exists( 'UtfNormal' ) ) {
   8         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
   9 }
  10
  11 define ( 'GAID_FOR_UPDATE', 1 );
  12
  13
  14 /**
  15  * Constants for pr_cascade bitfield
  16  */
  17 define( 'CASCADE', 1 );
  18
  19 /**
  20  * Represents a title within MediaWiki.
  21  * Optionally may contain an interwiki designation or namespace.
  22  * @note This class can fetch various kinds of data from the database;
  23  *       however, it does so inefficiently.
  24  */
  25 class Title {
  26         /** @name Static cache variables */
  27         //@{
  28         static private $titleCache=array();
  29         static private $interwikiCache=array();
  30         //@}
  31
  32         /**
  33          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  34          * commonly used titles. On a batch operation this can become a memory leak
  35          * if not bounded. After hitting this many titles reset the cache.
  36          */
  37         const CACHE_MAX = 1000;
  38
  39
  40         /**
  41          * @name Private member variables
  42          * Please use the accessor functions instead.
  43          * @private
  44          */
  45         //@{
  46
  47         var $mTextform = '';              ///< Text form (spaces not underscores) of the main part
  48         var $mUrlform = '';               ///< URL-encoded form of the main part
  49         var $mDbkeyform = '';             ///< Main part with underscores
  50         var $mUserCaseDBKey;              ///< DB key with the initial letter in the case specified by the user
  51         var $mNamespace = NS_MAIN;        ///< Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki = '';             ///< Interwiki prefix (or null string)
  53         var $mFragment;                   ///< Title fragment (i.e. the bit after the #)
  54         var $mArticleID = -1;             ///< Article ID, fetched from the link cache on demand
  55         var $mLatestID = false;           ///< ID of most recent revision
  56         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  57         var $mOldRestrictions = false;
  58         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  59         var $mRestrictionsExpiry = array();       ///< When do the restrictions on this page expire?
  60         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  61         var $mCascadeSources;  ///< Where are the cascading restrictions coming from on this page?
  62         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  63         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  64         # Don't change the following default, NS_MAIN is hardcoded in several
  65         # places.  See bug 696.
  66         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  67                                           # Zero except in {{transclusion}} tags
  68         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  69         var $mLength = -1;                ///< The page length, 0 for special pages
  70         var $mRedirect = null;            ///< Is the article at this title a redirect?
  71         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  72         //@}
  73
  74
  75         /**
  76          * Constructor
  77          * @private
  78          */
  79         /* private */ function __construct() {}
  80
  81         /**
  82          * Create a new Title from a prefixed DB key
  83          * @param $key \type{\string} The database key, which has underscores
  84          *      instead of spaces, possibly including namespace and
  85          *      interwiki prefixes
  86          * @return \type{Title} the new object, or NULL on an error
  87          */
  88         public static function newFromDBkey( $key ) {
  89                 $t = new Title();
  90                 $t->mDbkeyform = $key;
  91                 if( $t->secureAndSplit() )
  92                         return $t;
  93                 else
  94                         return NULL;
  95         }
  96
  97         /**
  98          * Create a new Title from text, such as what one would find in a link. De-
  99          * codes any HTML entities in the text.
 100          *
 101          * @param $text             string  The link text; spaces, prefixes, and an
 102          *   initial ':' indicating the main namespace are accepted.
 103          * @param $defaultNamespace int     The namespace to use if none is speci-
 104          *   fied by a prefix.  If you want to force a specific namespace even if
 105          *   $text might begin with a namespace prefix, use makeTitle() or
 106          *   makeTitleSafe().
 107          * @return Title  The new object, or null on an error.
 108          */
 109         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 110                 if( is_object( $text ) ) {
 111                         throw new MWException( 'Title::newFromText given an object' );
 112                 }
 113
 114                 /**
 115                  * Wiki pages often contain multiple links to the same page.
 116                  * Title normalization and parsing can become expensive on
 117                  * pages with many links, so we can save a little time by
 118                  * caching them.
 119                  *
 120                  * In theory these are value objects and won't get changed...
 121                  */
 122                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 123                         return Title::$titleCache[$text];
 124                 }
 125
 126                 /**
 127                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 128                  */
 129                 $filteredText = Sanitizer::decodeCharReferences( $text );
 130
 131                 $t = new Title();
 132                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 133                 $t->mDefaultNamespace = $defaultNamespace;
 134
 135                 static $cachedcount = 0 ;
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( $cachedcount >= self::CACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         Title::$titleCache = array();
 141                                         $cachedcount=0;
 142                                 }
 143                                 $cachedcount++;
 144                                 Title::$titleCache[$text] =& $t;
 145                         }
 146                         return $t;
 147                 } else {
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param $url \type{\string} the title, as might be taken from a URL
 157          * @return \type{Title} the new object, or NULL on an error
 158          */
 159         public static function newFromURL( $url ) {
 160                 global $wgLegalTitleChars;
 161                 $t = new Title();
 162
 163                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 164                 # but some URLs used it as a space replacement and they still come
 165                 # from some external search tools.
 166                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 167                         $url = str_replace( '+', ' ', $url );
 168                 }
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 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                 $fname = 'Title::newFromID';
 190                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 191                 $row = $db->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 192                         array( 'page_id' => $id ), $fname );
 193                 if ( $row !== false ) {
 194                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 195                 } else {
 196                         $title = NULL;
 197                 }
 198                 return $title;
 199         }
 200
 201         /**
 202          * Make an array of titles from an array of IDs
 203          * @param $ids \type{\arrayof{\int}} Array of IDs
 204          * @return \type{\arrayof{Title}} Array of Titles
 205          */
 206         public static function newFromIDs( $ids ) {
 207                 if ( !count( $ids ) ) {
 208                         return array();
 209                 }
 210                 $dbr = wfGetDB( DB_SLAVE );
 211                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 212                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 213
 214                 $titles = array();
 215                 foreach( $res as $row ) {
 216                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 217                 }
 218                 return $titles;
 219         }
 220
 221         /**
 222          * Make a Title object from a DB row
 223          * @param $row \type{Row} (needs at least page_title,page_namespace)
 224          * @return \type{Title} corresponding Title
 225          */
 226         public static function newFromRow( $row ) {
 227                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 228
 229                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 230                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 231                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : NULL;
 232                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 233
 234                 return $t;
 235         }
 236
 237         /**
 238          * Create a new Title from a namespace index and a DB key.
 239          * It's assumed that $ns and $title are *valid*, for instance when
 240          * they came directly from the database or a special page name.
 241          * For convenience, spaces are converted to underscores so that
 242          * eg user_text fields can be used directly.
 243          *
 244          * @param $ns \type{\int} the namespace of the article
 245          * @param $title \type{\string} the unprefixed database key form
 246          * @param $fragment \type{\string} The link fragment (after the "#")
 247          * @return \type{Title} the new object
 248          */
 249         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 250                 $t = new Title();
 251                 $t->mInterwiki = '';
 252                 $t->mFragment = $fragment;
 253                 $t->mNamespace = $ns = intval( $ns );
 254                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 255                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 256                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 257                 $t->mTextform = str_replace( '_', ' ', $title );
 258                 return $t;
 259         }
 260
 261         /**
 262          * Create a new Title from a namespace index and a DB key.
 263          * The parameters will be checked for validity, which is a bit slower
 264          * than makeTitle() but safer for user-provided data.
 265          *
 266          * @param $ns \type{\int} the namespace of the article
 267          * @param $title \type{\string} the database key form
 268          * @param $fragment \type{\string} The link fragment (after the "#")
 269          * @return \type{Title} the new object, or NULL on an error
 270          */
 271         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 272                 $t = new Title();
 273                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 274                 if( $t->secureAndSplit() ) {
 275                         return $t;
 276                 } else {
 277                         return NULL;
 278                 }
 279         }
 280
 281         /**
 282          * Create a new Title for the Main Page
 283          * @return \type{Title} the new object
 284          */
 285         public static function newMainPage() {
 286                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 287                 // Don't give fatal errors if the message is broken
 288                 if ( !$title ) {
 289                         $title = Title::newFromText( 'Main Page' );
 290                 }
 291                 return $title;
 292         }
 293
 294         /**
 295          * Extract a redirect destination from a string and return the
 296          * Title, or null if the text doesn't contain a valid redirect
 297          * This will only return the very next target, useful for
 298          * the redirect table and other checks that don't need full recursion
 299          *
 300          * @param $text \type{\string} Text with possible redirect
 301          * @return \type{Title} The corresponding Title
 302          */
 303         public static function newFromRedirect( $text ) {
 304                 return self::newFromRedirectInternal( $text );
 305         }
 306
 307         /**
 308          * Extract a redirect destination from a string and return the
 309          * Title, or null if the text doesn't contain a valid redirect
 310          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 311          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 312          *
 313          * @param $text \type{\string} Text with possible redirect
 314          * @return \type{Title} The corresponding Title
 315          */
 316         public static function newFromRedirectRecurse( $text ) {
 317                 $titles = self::newFromRedirectArray( $text );
 318                 return array_pop( $titles );
 319         }
 320
 321         /**
 322          * Extract a redirect destination from a string and return an
 323          * array of Titles, or null if the text doesn't contain a valid redirect
 324          * The last element in the array is the final destination after all redirects
 325          * have been resolved (up to $wgMaxRedirects times)
 326          *
 327          * @param $text \type{\string} Text with possible redirect
 328          * @return \type{\array} Array of Titles, with the destination last
 329          */
 330         public static function newFromRedirectArray( $text ) {
 331                 global $wgMaxRedirects;
 332                 // are redirects disabled?
 333                 if( $wgMaxRedirects < 1 )
 334                         return null;
 335                 $title = self::newFromRedirectInternal( $text );
 336                 if( is_null( $title ) )
 337                         return null;
 338                 // recursive check to follow double redirects
 339                 $recurse = $wgMaxRedirects;
 340                 $titles = array( $title );
 341                 while( --$recurse >= 0 ) {
 342                         if( $title->isRedirect() ) {
 343                                 $article = new Article( $title, 0 );
 344                                 $newtitle = $article->getRedirectTarget();
 345                         } else {
 346                                 break;
 347                         }
 348                         // Redirects to some special pages are not permitted
 349                         if( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 350                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 351                                 $title = $newtitle;
 352                                 $titles[] = $newtitle;
 353                         } else {
 354                                 break;
 355                         }
 356                 }
 357                 return $titles;
 358         }
 359
 360         /**
 361          * Really extract the redirect destination
 362          * Do not call this function directly, use one of the newFromRedirect* functions above
 363          *
 364          * @param $text \type{\string} Text with possible redirect
 365          * @return \type{Title} The corresponding Title
 366          */
 367         protected static function newFromRedirectInternal( $text ) {
 368                 $redir = MagicWord::get( 'redirect' );
 369                 $text = trim($text);
 370                 if( $redir->matchStartAndRemove( $text ) ) {
 371                         // Extract the first link and see if it's usable
 372                         // Ensure that it really does come directly after #REDIRECT
 373                         // Some older redirects included a colon, so don't freak about that!
 374                         $m = array();
 375                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 376                                 // Strip preceding colon used to "escape" categories, etc.
 377                                 // and URL-decode links
 378                                 if( strpos( $m[1], '%' ) !== false ) {
 379                                         // Match behavior of inline link parsing here;
 380                                         // don't interpret + as " " most of the time!
 381                                         // It might be safe to just use rawurldecode instead, though.
 382                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 383                                 }
 384                                 $title = Title::newFromText( $m[1] );
 385                                 // If the title is a redirect to bad special pages or is invalid, return null
 386                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 387                                         return null;
 388                                 }
 389                                 return $title;
 390                         }
 391                 }
 392                 return null;
 393         }
 394
 395 #----------------------------------------------------------------------------
 396 #       Static functions
 397 #----------------------------------------------------------------------------
 398
 399         /**
 400          * Get the prefixed DB key associated with an ID
 401          * @param $id \type{\int} the page_id of the article
 402          * @return \type{Title} an object representing the article, or NULL
 403          *      if no such article was found
 404          */
 405         public static function nameOf( $id ) {
 406                 $dbr = wfGetDB( DB_SLAVE );
 407
 408                 $s = $dbr->selectRow( 'page',
 409                         array( 'page_namespace','page_title' ),
 410                         array( 'page_id' => $id ),
 411                         __METHOD__ );
 412                 if ( $s === false ) { return NULL; }
 413
 414                 $n = self::makeName( $s->page_namespace, $s->page_title );
 415                 return $n;
 416         }
 417
 418         /**
 419          * Get a regex character class describing the legal characters in a link
 420          * @return \type{\string} the list of characters, not delimited
 421          */
 422         public static function legalChars() {
 423                 global $wgLegalTitleChars;
 424                 return $wgLegalTitleChars;
 425         }
 426
 427         /**
 428          * Get a string representation of a title suitable for
 429          * including in a search index
 430          *
 431          * @param $ns \type{\int} a namespace index
 432          * @param $title \type{\string} text-form main part
 433          * @return \type{\string} a stripped-down title string ready for the
 434          *      search index
 435          */
 436         public static function indexTitle( $ns, $title ) {
 437                 global $wgContLang;
 438
 439                 $lc = SearchEngine::legalSearchChars() . '&#;';
 440                 $t = $wgContLang->stripForSearch( $title );
 441                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 442                 $t = $wgContLang->lc( $t );
 443
 444                 # Handle 's, s'
 445                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 446                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 447
 448                 $t = preg_replace( "/\\s+/", ' ', $t );
 449
 450                 if ( $ns == NS_FILE ) {
 451                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 452                 }
 453                 return trim( $t );
 454         }
 455
 456         /*
 457          * Make a prefixed DB key from a DB key and a namespace index
 458          * @param $ns \type{\int} numerical representation of the namespace
 459          * @param $title \type{\string} the DB key form the title
 460          * @param $fragment \type{\string} The link fragment (after the "#")
 461          * @return \type{\string} the prefixed form of the title
 462          */
 463         public static function makeName( $ns, $title, $fragment = '' ) {
 464                 global $wgContLang;
 465
 466                 $namespace = $wgContLang->getNsText( $ns );
 467                 $name = $namespace == '' ? $title : "$namespace:$title";
 468                 if ( strval( $fragment ) != '' ) {
 469                         $name .= '#' . $fragment;
 470                 }
 471                 return $name;
 472         }
 473
 474         /**
 475          * Returns the URL associated with an interwiki prefix
 476          * @param $key \type{\string} the interwiki prefix (e.g. "MeatBall")
 477          * @return \type{\string} the associated URL, containing "$1",
 478          *      which should be replaced by an article title
 479          * @static (arguably)
 480          * @deprecated See Interwiki class
 481          */
 482         public function getInterwikiLink( $key )  {
 483                 return Interwiki::fetch( $key )->getURL( );
 484         }
 485
 486         /**
 487          * Determine whether the object refers to a page within
 488          * this project.
 489          *
 490          * @return \type{\bool} TRUE if this is an in-project interwiki link
 491          *      or a wikilink, FALSE otherwise
 492          */
 493         public function isLocal() {
 494                 if ( $this->mInterwiki != '' ) {
 495                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 496                 } else {
 497                         return true;
 498                 }
 499         }
 500
 501         /**
 502          * Determine whether the object refers to a page within
 503          * this project and is transcludable.
 504          *
 505          * @return \type{\bool} TRUE if this is transcludable
 506          */
 507         public function isTrans() {
 508                 if ($this->mInterwiki == '')
 509                         return false;
 510
 511                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 512         }
 513
 514         /**
 515          * Escape a text fragment, say from a link, for a URL
 516          */
 517         static function escapeFragmentForURL( $fragment ) {
 518                 global $wgEnforceHtmlIds;
 519                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 520                 # fragments appear not to work in IE (at least up to 7) or in at least
 521                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 522                 # to care if they aren't encoded.
 523                 return Sanitizer::escapeId( $fragment,
 524                         $wgEnforceHtmlIds ? 'noninitial' : 'xml' );
 525         }
 526
 527 #----------------------------------------------------------------------------
 528 #       Other stuff
 529 #----------------------------------------------------------------------------
 530
 531         /** Simple accessors */
 532         /**
 533          * Get the text form (spaces not underscores) of the main part
 534          * @return \type{\string} Main part of the title
 535          */
 536         public function getText() { return $this->mTextform; }
 537         /**
 538          * Get the URL-encoded form of the main part
 539          * @return \type{\string} Main part of the title, URL-encoded
 540          */
 541         public function getPartialURL() { return $this->mUrlform; }
 542         /**
 543          * Get the main part with underscores
 544          * @return \type{\string} Main part of the title, with underscores
 545          */
 546         public function getDBkey() { return $this->mDbkeyform; }
 547         /**
 548          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 549          * @return \type{\int} Namespace index
 550          */
 551         public function getNamespace() { return $this->mNamespace; }
 552         /**
 553          * Get the namespace text
 554          * @return \type{\string} Namespace text
 555          */
 556         public function getNsText() {
 557                 global $wgContLang, $wgCanonicalNamespaceNames;
 558
 559                 if ( '' != $this->mInterwiki ) {
 560                         // This probably shouldn't even happen. ohh man, oh yuck.
 561                         // But for interwiki transclusion it sometimes does.
 562                         // Shit. Shit shit shit.
 563                         //
 564                         // Use the canonical namespaces if possible to try to
 565                         // resolve a foreign namespace.
 566                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 567                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 568                         }
 569                 }
 570                 return $wgContLang->getNsText( $this->mNamespace );
 571         }
 572         /**
 573          * Get the DB key with the initial letter case as specified by the user
 574          * @return \type{\string} DB key
 575          */
 576         function getUserCaseDBKey() {
 577                 return $this->mUserCaseDBKey;
 578         }
 579         /**
 580          * Get the namespace text of the subject (rather than talk) page
 581          * @return \type{\string} Namespace text
 582          */
 583         public function getSubjectNsText() {
 584                 global $wgContLang;
 585                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 586         }
 587         /**
 588          * Get the namespace text of the talk page
 589          * @return \type{\string} Namespace text
 590          */
 591         public function getTalkNsText() {
 592                 global $wgContLang;
 593                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 594         }
 595         /**
 596          * Could this title have a corresponding talk page?
 597          * @return \type{\bool} TRUE or FALSE
 598          */
 599         public function canTalk() {
 600                 return( MWNamespace::canTalk( $this->mNamespace ) );
 601         }
 602         /**
 603          * Get the interwiki prefix (or null string)
 604          * @return \type{\string} Interwiki prefix
 605          */
 606         public function getInterwiki() { return $this->mInterwiki; }
 607         /**
 608          * Get the Title fragment (i.e.\ the bit after the #) in text form
 609          * @return \type{\string} Title fragment
 610          */
 611         public function getFragment() { return $this->mFragment; }
 612         /**
 613          * Get the fragment in URL form, including the "#" character if there is one
 614          * @return \type{\string} Fragment in URL form
 615          */
 616         public function getFragmentForURL() {
 617                 if ( $this->mFragment == '' ) {
 618                         return '';
 619                 } else {
 620                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 621                 }
 622         }
 623         /**
 624          * Get the default namespace index, for when there is no namespace
 625          * @return \type{\int} Default namespace index
 626          */
 627         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 628
 629         /**
 630          * Get title for search index
 631          * @return \type{\string} a stripped-down title string ready for the
 632          *      search index
 633          */
 634         public function getIndexTitle() {
 635                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 636         }
 637
 638         /**
 639          * Get the prefixed database key form
 640          * @return \type{\string} the prefixed title, with underscores and
 641          *      any interwiki and namespace prefixes
 642          */
 643         public function getPrefixedDBkey() {
 644                 $s = $this->prefix( $this->mDbkeyform );
 645                 $s = str_replace( ' ', '_', $s );
 646                 return $s;
 647         }
 648
 649         /**
 650          * Get the prefixed title with spaces.
 651          * This is the form usually used for display
 652          * @return \type{\string} the prefixed title, with spaces
 653          */
 654         public function getPrefixedText() {
 655                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 656                         $s = $this->prefix( $this->mTextform );
 657                         $s = str_replace( '_', ' ', $s );
 658                         $this->mPrefixedText = $s;
 659                 }
 660                 return $this->mPrefixedText;
 661         }
 662
 663         /**
 664          * Get the prefixed title with spaces, plus any fragment
 665          * (part beginning with '#')
 666          * @return \type{\string} the prefixed title, with spaces and
 667          *      the fragment, including '#'
 668          */
 669         public function getFullText() {
 670                 $text = $this->getPrefixedText();
 671                 if( '' != $this->mFragment ) {
 672                         $text .= '#' . $this->mFragment;
 673                 }
 674                 return $text;
 675         }
 676
 677         /**
 678          * Get the base name, i.e. the leftmost parts before the /
 679          * @return \type{\string} Base name
 680          */
 681         public function getBaseText() {
 682                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 683                         return $this->getText();
 684                 }
 685
 686                 $parts = explode( '/', $this->getText() );
 687                 # Don't discard the real title if there's no subpage involved
 688                 if( count( $parts ) > 1 )
 689                         unset( $parts[ count( $parts ) - 1 ] );
 690                 return implode( '/', $parts );
 691         }
 692
 693         /**
 694          * Get the lowest-level subpage name, i.e. the rightmost part after /
 695          * @return \type{\string} Subpage name
 696          */
 697         public function getSubpageText() {
 698                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 699                         return( $this->mTextform );
 700                 }
 701                 $parts = explode( '/', $this->mTextform );
 702                 return( $parts[ count( $parts ) - 1 ] );
 703         }
 704
 705         /**
 706          * Get a URL-encoded form of the subpage text
 707          * @return \type{\string} URL-encoded subpage name
 708          */
 709         public function getSubpageUrlForm() {
 710                 $text = $this->getSubpageText();
 711                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 712                 return( $text );
 713         }
 714
 715         /**
 716          * Get a URL-encoded title (not an actual URL) including interwiki
 717          * @return \type{\string} the URL-encoded form
 718          */
 719         public function getPrefixedURL() {
 720                 $s = $this->prefix( $this->mDbkeyform );
 721                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 722                 return $s;
 723         }
 724
 725         /**
 726          * Get a real URL referring to this title, with interwiki link and
 727          * fragment
 728          *
 729          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 730          *   links. Can be specified as an associative array as well, e.g.,
 731          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 732          * @param $variant \type{\string} language variant of url (for sr, zh..)
 733          * @return \type{\string} the URL
 734          */
 735         public function getFullURL( $query = '', $variant = false ) {
 736                 global $wgContLang, $wgServer, $wgRequest;
 737
 738                 if( is_array( $query ) ) {
 739                         $query = wfArrayToCGI( $query );
 740                 }
 741
 742                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 743                 if ( !$interwiki ) {
 744                         $url = $this->getLocalUrl( $query, $variant );
 745
 746                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 747                         // Correct fix would be to move the prepending elsewhere.
 748                         if ($wgRequest->getVal('action') != 'render') {
 749                                 $url = $wgServer . $url;
 750                         }
 751                 } else {
 752                         $baseUrl = $interwiki->getURL( );
 753
 754                         $namespace = wfUrlencode( $this->getNsText() );
 755                         if ( '' != $namespace ) {
 756                                 # Can this actually happen? Interwikis shouldn't be parsed.
 757                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 758                                 $namespace .= ':';
 759                         }
 760                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 761                         $url = wfAppendQuery( $url, $query );
 762                 }
 763
 764                 # Finally, add the fragment.
 765                 $url .= $this->getFragmentForURL();
 766
 767                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 768                 return $url;
 769         }
 770
 771         /**
 772          * Get a URL with no fragment or server name.  If this page is generated
 773          * with action=render, $wgServer is prepended.
 774          * @param mixed $query an optional query string; if not specified,
 775          *       $wgArticlePath will be used.  Can be specified as an associative array
 776          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 777          *   URL-escaped).
 778          * @param $variant \type{\string} language variant of url (for sr, zh..)
 779          * @return \type{\string} the URL
 780          */
 781         public function getLocalURL( $query = '', $variant = false ) {
 782                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 783                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 784
 785                 if( is_array( $query ) ) {
 786                         $query = wfArrayToCGI( $query );
 787                 }
 788
 789                 // internal links should point to same variant as current page (only anonymous users)
 790                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 791                         $pref = $wgContLang->getPreferredVariant(false);
 792                         if($pref != $wgContLang->getCode())
 793                                 $variant = $pref;
 794                 }
 795
 796                 if ( $this->isExternal() ) {
 797                         $url = $this->getFullURL();
 798                         if ( $query ) {
 799                                 // This is currently only used for edit section links in the
 800                                 // context of interwiki transclusion. In theory we should
 801                                 // append the query to the end of any existing query string,
 802                                 // but interwiki transclusion is already broken in that case.
 803                                 $url .= "?$query";
 804                         }
 805                 } else {
 806                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 807                         if ( $query == '' ) {
 808                                 if( $variant != false && $wgContLang->hasVariants() ) {
 809                                         if( $wgVariantArticlePath == false ) {
 810                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 811                                         } else {
 812                                                 $variantArticlePath = $wgVariantArticlePath;
 813                                         }
 814                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 815                                         $url = str_replace( '$1', $dbkey, $url  );
 816                                 } else {
 817                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 818                                 }
 819                         } else {
 820                                 global $wgActionPaths;
 821                                 $url = false;
 822                                 $matches = array();
 823                                 if( !empty( $wgActionPaths ) &&
 824                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 825                                 {
 826                                         $action = urldecode( $matches[2] );
 827                                         if( isset( $wgActionPaths[$action] ) ) {
 828                                                 $query = $matches[1];
 829                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 830                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 831                                                 if( $query != '' ) {
 832                                                         $url = wfAppendQuery( $url, $query );
 833                                                 }
 834                                         }
 835                                 }
 836                                 if ( $url === false ) {
 837                                         if ( $query == '-' ) {
 838                                                 $query = '';
 839                                         }
 840                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 841                                 }
 842                         }
 843
 844                         // FIXME: this causes breakage in various places when we
 845                         // actually expected a local URL and end up with dupe prefixes.
 846                         if ($wgRequest->getVal('action') == 'render') {
 847                                 $url = $wgServer . $url;
 848                         }
 849                 }
 850                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 851                 return $url;
 852         }
 853
 854         /**
 855          * Get a URL that's the simplest URL that will be valid to link, locally,
 856          * to the current Title.  It includes the fragment, but does not include
 857          * the server unless action=render is used (or the link is external).  If
 858          * there's a fragment but the prefixed text is empty, we just return a link
 859          * to the fragment.
 860          *
 861          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 862          *   query string.  Keys and values will be escaped.
 863          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 864          *   for external links.  Default is "false" (same variant as current page,
 865          *   for anonymous users).
 866          * @return \type{\string} the URL
 867          */
 868         public function getLinkUrl( $query = array(), $variant = false ) {
 869                 if( !is_array( $query ) ) {
 870                         throw new MWException( 'Title::getLinkUrl passed a non-array for '.
 871                         '$query' );
 872                 }
 873                 if( $this->isExternal() ) {
 874                         return $this->getFullURL( $query );
 875                 } elseif( $this->getPrefixedText() === ''
 876                 and $this->getFragment() !== '' ) {
 877                         return $this->getFragmentForURL();
 878                 } else {
 879                         return $this->getLocalURL( $query, $variant )
 880                                 . $this->getFragmentForURL();
 881                 }
 882         }
 883
 884         /**
 885          * Get an HTML-escaped version of the URL form, suitable for
 886          * using in a link, without a server name or fragment
 887          * @param $query \type{\string} an optional query string
 888          * @return \type{\string} the URL
 889          */
 890         public function escapeLocalURL( $query = '' ) {
 891                 return htmlspecialchars( $this->getLocalURL( $query ) );
 892         }
 893
 894         /**
 895          * Get an HTML-escaped version of the URL form, suitable for
 896          * using in a link, including the server name and fragment
 897          *
 898          * @param $query \type{\string} an optional query string
 899          * @return \type{\string} the URL
 900          */
 901         public function escapeFullURL( $query = '' ) {
 902                 return htmlspecialchars( $this->getFullURL( $query ) );
 903         }
 904
 905         /**
 906          * Get the URL form for an internal link.
 907          * - Used in various Squid-related code, in case we have a different
 908          * internal hostname for the server from the exposed one.
 909          *
 910          * @param $query \type{\string} an optional query string
 911          * @param $variant \type{\string} language variant of url (for sr, zh..)
 912          * @return \type{\string} the URL
 913          */
 914         public function getInternalURL( $query = '', $variant = false ) {
 915                 global $wgInternalServer;
 916                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 917                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 918                 return $url;
 919         }
 920
 921         /**
 922          * Get the edit URL for this Title
 923          * @return \type{\string} the URL, or a null string if this is an
 924          *      interwiki link
 925          */
 926         public function getEditURL() {
 927                 if ( '' != $this->mInterwiki ) { return ''; }
 928                 $s = $this->getLocalURL( 'action=edit' );
 929
 930                 return $s;
 931         }
 932
 933         /**
 934          * Get the HTML-escaped displayable text form.
 935          * Used for the title field in <a> tags.
 936          * @return \type{\string} the text, including any prefixes
 937          */
 938         public function getEscapedText() {
 939                 return htmlspecialchars( $this->getPrefixedText() );
 940         }
 941
 942         /**
 943          * Is this Title interwiki?
 944          * @return \type{\bool}
 945          */
 946         public function isExternal() { return ( '' != $this->mInterwiki ); }
 947
 948         /**
 949          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 950          *
 951          * @param @action \type{\string} Action to check (default: edit)
 952          * @return \type{\bool}
 953          */
 954         public function isSemiProtected( $action = 'edit' ) {
 955                 if( $this->exists() ) {
 956                         $restrictions = $this->getRestrictions( $action );
 957                         if( count( $restrictions ) > 0 ) {
 958                                 foreach( $restrictions as $restriction ) {
 959                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 960                                                 return false;
 961                                 }
 962                         } else {
 963                                 # Not protected
 964                                 return false;
 965                         }
 966                         return true;
 967                 } else {
 968                         # If it doesn't exist, it can't be protected
 969                         return false;
 970                 }
 971         }
 972
 973         /**
 974          * Does the title correspond to a protected article?
 975          * @param $what \type{\string} the action the page is protected from,
 976          * by default checks move and edit
 977          * @return \type{\bool}
 978          */
 979         public function isProtected( $action = '' ) {
 980                 global $wgRestrictionLevels, $wgRestrictionTypes;
 981
 982                 # Special pages have inherent protection
 983                 if( $this->getNamespace() == NS_SPECIAL )
 984                         return true;
 985
 986                 # Check regular protection levels
 987                 foreach( $wgRestrictionTypes as $type ){
 988                         if( $action == $type || $action == '' ) {
 989                                 $r = $this->getRestrictions( $type );
 990                                 foreach( $wgRestrictionLevels as $level ) {
 991                                         if( in_array( $level, $r ) && $level != '' ) {
 992                                                 return true;
 993                                         }
 994                                 }
 995                         }
 996                 }
 997
 998                 return false;
 999         }
1000
1001         /**
1002          * Is $wgUser watching this page?
1003          * @return \type{\bool}
1004          */
1005         public function userIsWatching() {
1006                 global $wgUser;
1007
1008                 if ( is_null( $this->mWatched ) ) {
1009                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1010                                 $this->mWatched = false;
1011                         } else {
1012                                 $this->mWatched = $wgUser->isWatched( $this );
1013                         }
1014                 }
1015                 return $this->mWatched;
1016         }
1017
1018         /**
1019          * Can $wgUser perform $action on this page?
1020          * This skips potentially expensive cascading permission checks.
1021          *
1022          * Suitable for use for nonessential UI controls in common cases, but
1023          * _not_ for functional access control.
1024          *
1025          * May provide false positives, but should never provide a false negative.
1026          *
1027          * @param $action \type{\string} action that permission needs to be checked for
1028          * @return \type{\bool}
1029          */
1030         public function quickUserCan( $action ) {
1031                 return $this->userCan( $action, false );
1032         }
1033
1034         /**
1035          * Determines if $wgUser is unable to edit this page because it has been protected
1036          * by $wgNamespaceProtection.
1037          *
1038          * @return \type{\bool}
1039          */
1040         public function isNamespaceProtected() {
1041                 global $wgNamespaceProtection, $wgUser;
1042                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1043                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1044                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1045                                         return true;
1046                         }
1047                 }
1048                 return false;
1049         }
1050
1051         /**
1052          * Can $wgUser perform $action on this page?
1053          * @param $action \type{\string} action that permission needs to be checked for
1054          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1055          * @return \type{\bool}
1056          */
1057         public function userCan( $action, $doExpensiveQueries = true ) {
1058                 global $wgUser;
1059                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1060         }
1061
1062         /**
1063          * Can $user perform $action on this page?
1064          *
1065          * FIXME: This *does not* check throttles (User::pingLimiter()).
1066          *
1067          * @param $action \type{\string}action that permission needs to be checked for
1068          * @param $user \type{User} user to check
1069          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1070          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1071          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1072          */
1073         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1074                 if( !StubObject::isRealObject( $user ) ) {
1075                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1076                         global $wgUser;
1077                         $wgUser->_unstub( '', 5 );
1078                         $user = $wgUser;
1079                 }
1080                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1081
1082                 global $wgContLang;
1083                 global $wgLang;
1084                 global $wgEmailConfirmToEdit;
1085
1086                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1087                         $errors[] = array( 'confirmedittext' );
1088                 }
1089
1090                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1091                 if ( $user->isBlockedFrom( $this ) && $action != 'read' && $action != 'createaccount' ) {
1092                         $block = $user->mBlock;
1093
1094                         // This is from OutputPage::blockedPage
1095                         // Copied at r23888 by werdna
1096
1097                         $id = $user->blockedBy();
1098                         $reason = $user->blockedFor();
1099                         if( $reason == '' ) {
1100                                 $reason = wfMsg( 'blockednoreason' );
1101                         }
1102                         $ip = wfGetIP();
1103
1104                         if ( is_numeric( $id ) ) {
1105                                 $name = User::whoIs( $id );
1106                         } else {
1107                                 $name = $id;
1108                         }
1109
1110                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1111                         $blockid = $block->mId;
1112                         $blockExpiry = $user->mBlock->mExpiry;
1113                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1114
1115                         if ( $blockExpiry == 'infinity' ) {
1116                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1117                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1118
1119                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1120                                         if ( strpos( $option, ':' ) == false )
1121                                                 continue;
1122
1123                                         list ($show, $value) = explode( ":", $option );
1124
1125                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1126                                                 $blockExpiry = $show;
1127                                                 break;
1128                                         }
1129                                 }
1130                         } else {
1131                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1132                         }
1133
1134                         $intended = $user->mBlock->mAddress;
1135
1136                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1137                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1138                 }
1139
1140                 // Remove the errors being ignored.
1141
1142                 foreach( $errors as $index => $error ) {
1143                         $error_key = is_array($error) ? $error[0] : $error;
1144
1145                         if (in_array( $error_key, $ignoreErrors )) {
1146                                 unset($errors[$index]);
1147                         }
1148                 }
1149
1150                 return $errors;
1151         }
1152
1153         /**
1154          * Can $user perform $action on this page? This is an internal function,
1155          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1156          * checks on wfReadOnly() and blocks)
1157          *
1158          * @param $action \type{\string} action that permission needs to be checked for
1159          * @param $user \type{User} user to check
1160          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1161          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1162          */
1163         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1164                 wfProfileIn( __METHOD__ );
1165
1166                 $errors = array();
1167
1168                 // Use getUserPermissionsErrors instead
1169                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1170                         wfProfileOut( __METHOD__ );
1171                         return $result ? array() : array( array( 'badaccess-group0' ) );
1172                 }
1173
1174                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1175                         if( is_array($result) && count($result) && !is_array($result[0]) )
1176                                 $errors[] = $result; # A single array representing an error
1177                         else if( is_array($result) && is_array($result[0]) )
1178                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1179                         else if( $result !== '' && is_string($result) )
1180                                 $errors[] = array($result); # A string representing a message-id
1181                         else if( $result === false )
1182                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1183                 }
1184                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1185                         if( is_array($result) && count($result) && !is_array($result[0]) )
1186                                 $errors[] = $result; # A single array representing an error
1187                         else if( is_array($result) && is_array($result[0]) )
1188                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1189                         else if( $result !== '' && is_string($result) )
1190                                 $errors[] = array($result); # A string representing a message-id
1191                         else if( $result === false )
1192                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1193                 }
1194
1195                 // TODO: document
1196                 $specialOKActions = array( 'createaccount', 'execute' );
1197                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1198                         $errors[] = array('ns-specialprotected');
1199                 }
1200
1201                 if( $this->isNamespaceProtected() ) {
1202                         $ns = $this->getNamespace() == NS_MAIN ?
1203                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1204                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1205                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1206                 }
1207
1208                 # protect css/js subpages of user pages
1209                 # XXX: this might be better using restrictions
1210                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1211                 if( $this->isCssJsSubpage() && !$user->isAllowed('editusercssjs')
1212                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1213                 {
1214                         $errors[] = array('customcssjsprotected');
1215                 }
1216
1217                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1218                         # We /could/ use the protection level on the source page, but it's fairly ugly
1219                         #  as we have to establish a precedence hierarchy for pages included by multiple
1220                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1221                         #  as they could remove the protection anyway.
1222                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1223                         # Cascading protection depends on more than this page...
1224                         # Several cascading protected pages may include this page...
1225                         # Check each cascading level
1226                         # This is only for protection restrictions, not for all actions
1227                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1228                                 foreach( $restrictions[$action] as $right ) {
1229                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1230                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1231                                                 $pages = '';
1232                                                 foreach( $cascadingSources as $page )
1233                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1234                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1235                                         }
1236                                 }
1237                         }
1238                 }
1239
1240                 foreach( $this->getRestrictions($action) as $right ) {
1241                         // Backwards compatibility, rewrite sysop -> protect
1242                         if( $right == 'sysop' ) {
1243                                 $right = 'protect';
1244                         }
1245                         if( '' != $right && !$user->isAllowed( $right ) ) {
1246                                 // Users with 'editprotected' permission can edit protected pages
1247                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1248                                         // Users with 'editprotected' permission cannot edit protected pages
1249                                         // with cascading option turned on.
1250                                         if( $this->mCascadeRestriction ) {
1251                                                 $errors[] = array( 'protectedpagetext', $right );
1252                                         } else {
1253                                                 // Nothing, user can edit!
1254                                         }
1255                                 } else {
1256                                         $errors[] = array( 'protectedpagetext', $right );
1257                                 }
1258                         }
1259                 }
1260
1261                 if( $action == 'protect' ) {
1262                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1263                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1264                         }
1265                 }
1266
1267                 if( $action == 'create' ) {
1268                         $title_protection = $this->getTitleProtection();
1269                         if( is_array($title_protection) ) {
1270                                 extract($title_protection); // is this extract() really needed?
1271
1272                                 if( $pt_create_perm == 'sysop' ) {
1273                                         $pt_create_perm = 'protect'; // B/C
1274                                 }
1275                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1276                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1277                                 }
1278                         }
1279
1280                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1281                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1282                         {
1283                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1284                         }
1285                 } elseif( $action == 'move' ) {
1286                         if( !$user->isAllowed( 'move' ) ) {
1287                                 // User can't move anything
1288                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1289                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1290                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1291                         {
1292                                 // Show user page-specific message only if the user can move other pages
1293                                 $errors[] = array( 'cant-move-user-page' );
1294                         }
1295                         // Check if user is allowed to move files if it's a file
1296                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1297                                 $errors[] = array( 'movenotallowedfile' );
1298                         }
1299                         // Check for immobile pages
1300                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1301                                 // Specific message for this case
1302                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1303                         } elseif( !$this->isMovable() ) {
1304                                 // Less specific message for rarer cases
1305                                 $errors[] = array( 'immobile-page' );
1306                         }
1307                 } elseif( $action == 'move-target' ) {
1308                         if( !$user->isAllowed( 'move' ) ) {
1309                                 // User can't move anything
1310                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1311                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1312                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1313                         {
1314                                 // Show user page-specific message only if the user can move other pages
1315                                 $errors[] = array( 'cant-move-to-user-page' );
1316                         }
1317                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1318                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1319                         } elseif( !$this->isMovable() ) {
1320                                 $errors[] = array( 'immobile-target-page' );
1321                         }
1322                 } elseif( !$user->isAllowed( $action ) ) {
1323                         $return = null;
1324                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1325                                 User::getGroupsWithPermission( $action ) );
1326                         if( $groups ) {
1327                                 $return = array( 'badaccess-groups',
1328                                         array( implode( ', ', $groups ), count( $groups ) ) );
1329                         } else {
1330                                 $return = array( "badaccess-group0" );
1331                         }
1332                         $errors[] = $return;
1333                 }
1334
1335                 wfProfileOut( __METHOD__ );
1336                 return $errors;
1337         }
1338
1339         /**
1340          * Is this title subject to title protection?
1341          * @return \type{\mixed} An associative array representing any existent title
1342          *   protection, or false if there's none.
1343          */
1344         private function getTitleProtection() {
1345                 // Can't protect pages in special namespaces
1346                 if ( $this->getNamespace() < 0 ) {
1347                         return false;
1348                 }
1349
1350                 $dbr = wfGetDB( DB_SLAVE );
1351                 $res = $dbr->select( 'protected_titles', '*',
1352                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1353                         __METHOD__ );
1354
1355                 if ($row = $dbr->fetchRow( $res )) {
1356                         return $row;
1357                 } else {
1358                         return false;
1359                 }
1360         }
1361
1362         /**
1363          * Update the title protection status
1364          * @param $create_perm \type{\string} Permission required for creation
1365          * @param $reason \type{\string} Reason for protection
1366          * @param $expiry \type{\string} Expiry timestamp
1367          */
1368         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1369                 global $wgUser,$wgContLang;
1370
1371                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1372                         && $expiry == $this->mRestrictionsExpiry['create']) {
1373                         // No change
1374                         return true;
1375                 }
1376
1377                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1378
1379                 $dbw = wfGetDB( DB_MASTER );
1380
1381                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1382
1383                 $expiry_description = '';
1384                 if ( $encodedExpiry != 'infinity' ) {
1385                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) , $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1386                 }
1387                 else {
1388                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1389                 }
1390
1391                 # Update protection table
1392                 if ($create_perm != '' ) {
1393                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1394                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1395                                         , 'pt_create_perm' => $create_perm
1396                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1397                                         , 'pt_expiry' => $encodedExpiry
1398                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1399                 } else {
1400                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1401                                 'pt_title' => $title ), __METHOD__ );
1402                 }
1403                 # Update the protection log
1404                 $log = new LogPage( 'protect' );
1405
1406                 if( $create_perm ) {
1407                         $params = array("[create=$create_perm] $expiry_description",'');
1408                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason ), $params );
1409                 } else {
1410                         $log->addEntry( 'unprotect', $this, $reason );
1411                 }
1412
1413                 return true;
1414         }
1415
1416         /**
1417          * Remove any title protection due to page existing
1418          */
1419         public function deleteTitleProtection() {
1420                 $dbw = wfGetDB( DB_MASTER );
1421
1422                 $dbw->delete( 'protected_titles',
1423                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1424                         __METHOD__ );
1425         }
1426
1427         /**
1428          * Can $wgUser edit this page?
1429          * @return \type{\bool} TRUE or FALSE
1430          * @deprecated use userCan('edit')
1431          */
1432         public function userCanEdit( $doExpensiveQueries = true ) {
1433                 return $this->userCan( 'edit', $doExpensiveQueries );
1434         }
1435
1436         /**
1437          * Can $wgUser create this page?
1438          * @return \type{\bool} TRUE or FALSE
1439          * @deprecated use userCan('create')
1440          */
1441         public function userCanCreate( $doExpensiveQueries = true ) {
1442                 return $this->userCan( 'create', $doExpensiveQueries );
1443         }
1444
1445         /**
1446          * Can $wgUser move this page?
1447          * @return \type{\bool} TRUE or FALSE
1448          * @deprecated use userCan('move')
1449          */
1450         public function userCanMove( $doExpensiveQueries = true ) {
1451                 return $this->userCan( 'move', $doExpensiveQueries );
1452         }
1453
1454         /**
1455          * Would anybody with sufficient privileges be able to move this page?
1456          * Some pages just aren't movable.
1457          *
1458          * @return \type{\bool} TRUE or FALSE
1459          */
1460         public function isMovable() {
1461                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1462         }
1463
1464         /**
1465          * Can $wgUser read this page?
1466          * @return \type{\bool} TRUE or FALSE
1467          * @todo fold these checks into userCan()
1468          */
1469         public function userCanRead() {
1470                 global $wgUser, $wgGroupPermissions;
1471
1472                 $result = null;
1473                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1474                 if ( $result !== null ) {
1475                         return $result;
1476                 }
1477
1478                 # Shortcut for public wikis, allows skipping quite a bit of code
1479                 if ($wgGroupPermissions['*']['read'])
1480                         return true;
1481
1482                 if( $wgUser->isAllowed( 'read' ) ) {
1483                         return true;
1484                 } else {
1485                         global $wgWhitelistRead;
1486
1487                         /**
1488                          * Always grant access to the login page.
1489                          * Even anons need to be able to log in.
1490                         */
1491                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1492                                 return true;
1493                         }
1494
1495                         /**
1496                          * Bail out if there isn't whitelist
1497                          */
1498                         if( !is_array($wgWhitelistRead) ) {
1499                                 return false;
1500                         }
1501
1502                         /**
1503                          * Check for explicit whitelisting
1504                          */
1505                         $name = $this->getPrefixedText();
1506                         $dbName = $this->getPrefixedDBKey();
1507                         // Check with and without underscores
1508                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1509                                 return true;
1510
1511                         /**
1512                          * Old settings might have the title prefixed with
1513                          * a colon for main-namespace pages
1514                          */
1515                         if( $this->getNamespace() == NS_MAIN ) {
1516                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1517                                         return true;
1518                         }
1519
1520                         /**
1521                          * If it's a special page, ditch the subpage bit
1522                          * and check again
1523                          */
1524                         if( $this->getNamespace() == NS_SPECIAL ) {
1525                                 $name = $this->getDBkey();
1526                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1527                                 if ( $name === false ) {
1528                                         # Invalid special page, but we show standard login required message
1529                                         return false;
1530                                 }
1531
1532                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1533                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1534                                         return true;
1535                         }
1536
1537                 }
1538                 return false;
1539         }
1540
1541         /**
1542          * Is this a talk page of some sort?
1543          * @return \type{\bool} TRUE or FALSE
1544          */
1545         public function isTalkPage() {
1546                 return MWNamespace::isTalk( $this->getNamespace() );
1547         }
1548
1549         /**
1550          * Is this a subpage?
1551          * @return \type{\bool} TRUE or FALSE
1552          */
1553         public function isSubpage() {
1554                 return MWNamespace::hasSubpages( $this->mNamespace )
1555                         ? strpos( $this->getText(), '/' ) !== false
1556                         : false;
1557         }
1558
1559         /**
1560          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1561          * @return \type{\bool} TRUE or FALSE
1562          */
1563         public function hasSubpages() {
1564                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1565                         # Duh
1566                         return false;
1567                 }
1568
1569                 # We dynamically add a member variable for the purpose of this method
1570                 # alone to cache the result.  There's no point in having it hanging
1571                 # around uninitialized in every Title object; therefore we only add it
1572                 # if needed and don't declare it statically.
1573                 if( isset( $this->mHasSubpages ) ) {
1574                         return $this->mHasSubpages;
1575                 }
1576
1577                 $db = wfGetDB( DB_SLAVE );
1578                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1579                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1580                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1581                         __METHOD__
1582                 );
1583         }
1584
1585         /**
1586          * Could this page contain custom CSS or JavaScript, based
1587          * on the title?
1588          *
1589          * @return \type{\bool} TRUE or FALSE
1590          */
1591         public function isCssOrJsPage() {
1592                 return $this->mNamespace == NS_MEDIAWIKI
1593                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1594         }
1595
1596         /**
1597          * Is this a .css or .js subpage of a user page?
1598          * @return \type{\bool} TRUE or FALSE
1599          */
1600         public function isCssJsSubpage() {
1601                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1602         }
1603         /**
1604          * Is this a *valid* .css or .js subpage of a user page?
1605          * Check that the corresponding skin exists
1606          * @return \type{\bool} TRUE or FALSE
1607          */
1608         public function isValidCssJsSubpage() {
1609                 if ( $this->isCssJsSubpage() ) {
1610                         $skinNames = Skin::getSkinNames();
1611                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1612                 } else {
1613                         return false;
1614                 }
1615         }
1616         /**
1617          * Trim down a .css or .js subpage title to get the corresponding skin name
1618          */
1619         public function getSkinFromCssJsSubpage() {
1620                 $subpage = explode( '/', $this->mTextform );
1621                 $subpage = $subpage[ count( $subpage ) - 1 ];
1622                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1623         }
1624         /**
1625          * Is this a .css subpage of a user page?
1626          * @return \type{\bool} TRUE or FALSE
1627          */
1628         public function isCssSubpage() {
1629                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1630         }
1631         /**
1632          * Is this a .js subpage of a user page?
1633          * @return \type{\bool} TRUE or FALSE
1634          */
1635         public function isJsSubpage() {
1636                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1637         }
1638         /**
1639          * Protect css/js subpages of user pages: can $wgUser edit
1640          * this page?
1641          *
1642          * @return \type{\bool} TRUE or FALSE
1643          * @todo XXX: this might be better using restrictions
1644          */
1645         public function userCanEditCssJsSubpage() {
1646                 global $wgUser;
1647                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1648         }
1649
1650         /**
1651          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1652          *
1653          * @return \type{\bool} If the page is subject to cascading restrictions.
1654          */
1655         public function isCascadeProtected() {
1656                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1657                 return ( $sources > 0 );
1658         }
1659
1660         /**
1661          * Cascading protection: Get the source of any cascading restrictions on this page.
1662          *
1663          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1664          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1665          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1666          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1667          */
1668         public function getCascadeProtectionSources( $get_pages = true ) {
1669                 global $wgRestrictionTypes;
1670
1671                 # Define our dimension of restrictions types
1672                 $pagerestrictions = array();
1673                 foreach( $wgRestrictionTypes as $action )
1674                         $pagerestrictions[$action] = array();
1675
1676                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1677                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1678                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1679                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1680                 }
1681
1682                 wfProfileIn( __METHOD__ );
1683
1684                 $dbr = wfGetDB( DB_SLAVE );
1685
1686                 if ( $this->getNamespace() == NS_FILE ) {
1687                         $tables = array ('imagelinks', 'page_restrictions');
1688                         $where_clauses = array(
1689                                 'il_to' => $this->getDBkey(),
1690                                 'il_from=pr_page',
1691                                 'pr_cascade' => 1 );
1692                 } else {
1693                         $tables = array ('templatelinks', 'page_restrictions');
1694                         $where_clauses = array(
1695                                 'tl_namespace' => $this->getNamespace(),
1696                                 'tl_title' => $this->getDBkey(),
1697                                 'tl_from=pr_page',
1698                                 'pr_cascade' => 1 );
1699                 }
1700
1701                 if ( $get_pages ) {
1702                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1703                         $where_clauses[] = 'page_id=pr_page';
1704                         $tables[] = 'page';
1705                 } else {
1706                         $cols = array( 'pr_expiry' );
1707                 }
1708
1709                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1710
1711                 $sources = $get_pages ? array() : false;
1712                 $now = wfTimestampNow();
1713                 $purgeExpired = false;
1714
1715                 foreach( $res as $row ) {
1716                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1717                         if( $expiry > $now ) {
1718                                 if ($get_pages) {
1719                                         $page_id = $row->pr_page;
1720                                         $page_ns = $row->page_namespace;
1721                                         $page_title = $row->page_title;
1722                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1723                                         # Add groups needed for each restriction type if its not already there
1724                                         # Make sure this restriction type still exists
1725                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1726                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1727                                         }
1728                                 } else {
1729                                         $sources = true;
1730                                 }
1731                         } else {
1732                                 // Trigger lazy purge of expired restrictions from the db
1733                                 $purgeExpired = true;
1734                         }
1735                 }
1736                 if( $purgeExpired ) {
1737                         Title::purgeExpiredRestrictions();
1738                 }
1739
1740                 wfProfileOut( __METHOD__ );
1741
1742                 if ( $get_pages ) {
1743                         $this->mCascadeSources = $sources;
1744                         $this->mCascadingRestrictions = $pagerestrictions;
1745                 } else {
1746                         $this->mHasCascadingRestrictions = $sources;
1747                 }
1748                 return array( $sources, $pagerestrictions );
1749         }
1750
1751         function areRestrictionsCascading() {
1752                 if (!$this->mRestrictionsLoaded) {
1753                         $this->loadRestrictions();
1754                 }
1755
1756                 return $this->mCascadeRestriction;
1757         }
1758
1759         /**
1760          * Loads a string into mRestrictions array
1761          * @param $res \type{Resource} restrictions as an SQL result.
1762          */
1763         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1764                 global $wgRestrictionTypes;
1765                 $dbr = wfGetDB( DB_SLAVE );
1766
1767                 foreach( $wgRestrictionTypes as $type ){
1768                         $this->mRestrictions[$type] = array();
1769                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1770                 }
1771
1772                 $this->mCascadeRestriction = false;
1773
1774                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1775
1776                 if ( $oldFashionedRestrictions === NULL ) {
1777                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1778                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1779                 }
1780
1781                 if ($oldFashionedRestrictions != '') {
1782
1783                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1784                                 $temp = explode( '=', trim( $restrict ) );
1785                                 if(count($temp) == 1) {
1786                                         // old old format should be treated as edit/move restriction
1787                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1788                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1789                                 } else {
1790                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1791                                 }
1792                         }
1793
1794                         $this->mOldRestrictions = true;
1795
1796                 }
1797
1798                 if( $dbr->numRows( $res ) ) {
1799                         # Current system - load second to make them override.
1800                         $now = wfTimestampNow();
1801                         $purgeExpired = false;
1802
1803                         foreach( $res as $row ) {
1804                                 # Cycle through all the restrictions.
1805
1806                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1807                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1808                                         continue;
1809
1810                                 // This code should be refactored, now that it's being used more generally,
1811                                 // But I don't really see any harm in leaving it in Block for now -werdna
1812                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1813
1814                                 // Only apply the restrictions if they haven't expired!
1815                                 if ( !$expiry || $expiry > $now ) {
1816                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1817                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1818
1819                                         $this->mCascadeRestriction |= $row->pr_cascade;
1820                                 } else {
1821                                         // Trigger a lazy purge of expired restrictions
1822                                         $purgeExpired = true;
1823                                 }
1824                         }
1825
1826                         if( $purgeExpired ) {
1827                                 Title::purgeExpiredRestrictions();
1828                         }
1829                 }
1830
1831                 $this->mRestrictionsLoaded = true;
1832         }
1833
1834         /**
1835          * Load restrictions from the page_restrictions table
1836          */
1837         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1838                 if( !$this->mRestrictionsLoaded ) {
1839                         if ($this->exists()) {
1840                                 $dbr = wfGetDB( DB_SLAVE );
1841
1842                                 $res = $dbr->select( 'page_restrictions', '*',
1843                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1844
1845                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1846                         } else {
1847                                 $title_protection = $this->getTitleProtection();
1848
1849                                 if (is_array($title_protection)) {
1850                                         extract($title_protection);
1851
1852                                         $now = wfTimestampNow();
1853                                         $expiry = Block::decodeExpiry($pt_expiry);
1854
1855                                         if (!$expiry || $expiry > $now) {
1856                                                 // Apply the restrictions
1857                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1858                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1859                                         } else { // Get rid of the old restrictions
1860                                                 Title::purgeExpiredRestrictions();
1861                                         }
1862                                 } else {
1863                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1864                                 }
1865                                 $this->mRestrictionsLoaded = true;
1866                         }
1867                 }
1868         }
1869
1870         /**
1871          * Purge expired restrictions from the page_restrictions table
1872          */
1873         static function purgeExpiredRestrictions() {
1874                 $dbw = wfGetDB( DB_MASTER );
1875                 $dbw->delete( 'page_restrictions',
1876                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1877                         __METHOD__ );
1878
1879                 $dbw->delete( 'protected_titles',
1880                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1881                         __METHOD__ );
1882         }
1883
1884         /**
1885          * Accessor/initialisation for mRestrictions
1886          *
1887          * @param $action \type{\string} action that permission needs to be checked for
1888          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
1889          */
1890         public function getRestrictions( $action ) {
1891                 if( !$this->mRestrictionsLoaded ) {
1892                         $this->loadRestrictions();
1893                 }
1894                 return isset( $this->mRestrictions[$action] )
1895                                 ? $this->mRestrictions[$action]
1896                                 : array();
1897         }
1898
1899         /**
1900          * Get the expiry time for the restriction against a given action
1901          * @return 14-char timestamp, or 'infinity' if the page is protected forever
1902          * or not protected at all, or false if the action is not recognised.
1903          */
1904         public function getRestrictionExpiry( $action ) {
1905                 if( !$this->mRestrictionsLoaded ) {
1906                         $this->loadRestrictions();
1907                 }
1908                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
1909         }
1910
1911         /**
1912          * Is there a version of this page in the deletion archive?
1913          * @return \type{\int} the number of archived revisions
1914          */
1915         public function isDeleted() {
1916                 $fname = 'Title::isDeleted';
1917                 if ( $this->getNamespace() < 0 ) {
1918                         $n = 0;
1919                 } else {
1920                         $dbr = wfGetDB( DB_SLAVE );
1921                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1922                                 'ar_title' => $this->getDBkey() ), $fname );
1923                         if( $this->getNamespace() == NS_FILE ) {
1924                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1925                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1926                         }
1927                 }
1928                 return (int)$n;
1929         }
1930
1931         /**
1932          * Get the article ID for this Title from the link cache,
1933          * adding it if necessary
1934          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
1935          *      for update
1936          * @return \type{\int} the ID
1937          */
1938         public function getArticleID( $flags = 0 ) {
1939                 if( $this->getNamespace() < 0 ) {
1940                         return $this->mArticleID = 0;
1941                 }
1942                 $linkCache = LinkCache::singleton();
1943                 if( $flags & GAID_FOR_UPDATE ) {
1944                         $oldUpdate = $linkCache->forUpdate( true );
1945                         $linkCache->clearLink( $this );
1946                         $this->mArticleID = $linkCache->addLinkObj( $this );
1947                         $linkCache->forUpdate( $oldUpdate );
1948                 } else {
1949                         if( -1 == $this->mArticleID ) {
1950                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1951                         }
1952                 }
1953                 return $this->mArticleID;
1954         }
1955
1956         /**
1957          * Is this an article that is a redirect page?
1958          * Uses link cache, adding it if necessary
1959          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1960          * @return \type{\bool}
1961          */
1962         public function isRedirect( $flags = 0 ) {
1963                 if( !is_null($this->mRedirect) )
1964                         return $this->mRedirect;
1965                 # Calling getArticleID() loads the field from cache as needed
1966                 if( !$this->getArticleID($flags) ) {
1967                         return $this->mRedirect = false;
1968                 }
1969                 $linkCache = LinkCache::singleton();
1970                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1971
1972                 return $this->mRedirect;
1973         }
1974
1975         /**
1976          * What is the length of this page?
1977          * Uses link cache, adding it if necessary
1978          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1979          * @return \type{\bool}
1980          */
1981         public function getLength( $flags = 0 ) {
1982                 if( $this->mLength != -1 )
1983                         return $this->mLength;
1984                 # Calling getArticleID() loads the field from cache as needed
1985                 if( !$this->getArticleID($flags) ) {
1986                         return $this->mLength = 0;
1987                 }
1988                 $linkCache = LinkCache::singleton();
1989                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
1990
1991                 return $this->mLength;
1992         }
1993
1994         /**
1995          * What is the page_latest field for this page?
1996          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1997          * @return \type{\int}
1998          */
1999         public function getLatestRevID( $flags = 0 ) {
2000                 if( $this->mLatestID !== false )
2001                         return $this->mLatestID;
2002
2003                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2004                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
2005                 return $this->mLatestID;
2006         }
2007
2008         /**
2009          * This clears some fields in this object, and clears any associated
2010          * keys in the "bad links" section of the link cache.
2011          *
2012          * - This is called from Article::insertNewArticle() to allow
2013          * loading of the new page_id. It's also called from
2014          * Article::doDeleteArticle()
2015          *
2016          * @param $newid \type{\int} the new Article ID
2017          */
2018         public function resetArticleID( $newid ) {
2019                 $linkCache = LinkCache::singleton();
2020                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2021
2022                 if ( 0 == $newid ) { $this->mArticleID = -1; }
2023                 else { $this->mArticleID = $newid; }
2024                 $this->mRestrictionsLoaded = false;
2025                 $this->mRestrictions = array();
2026         }
2027
2028         /**
2029          * Updates page_touched for this page; called from LinksUpdate.php
2030          * @return \type{\bool} true if the update succeded
2031          */
2032         public function invalidateCache() {
2033                 if( wfReadOnly() ) {
2034                         return;
2035                 }
2036                 $dbw = wfGetDB( DB_MASTER );
2037                 $success = $dbw->update( 'page',
2038                         array( 'page_touched' => $dbw->timestamp() ),
2039                         $this->pageCond(),
2040                         __METHOD__
2041                 );
2042                 HTMLFileCache::clearFileCache( $this );
2043                 return $success;
2044         }
2045
2046         /**
2047          * Prefix some arbitrary text with the namespace or interwiki prefix
2048          * of this object
2049          *
2050          * @param $name \type{\string} the text
2051          * @return \type{\string} the prefixed text
2052          * @private
2053          */
2054         /* private */ function prefix( $name ) {
2055                 $p = '';
2056                 if ( '' != $this->mInterwiki ) {
2057                         $p = $this->mInterwiki . ':';
2058                 }
2059                 if ( 0 != $this->mNamespace ) {
2060                         $p .= $this->getNsText() . ':';
2061                 }
2062                 return $p . $name;
2063         }
2064
2065         /**
2066          * Secure and split - main initialisation function for this object
2067          *
2068          * Assumes that mDbkeyform has been set, and is urldecoded
2069          * and uses underscores, but not otherwise munged.  This function
2070          * removes illegal characters, splits off the interwiki and
2071          * namespace prefixes, sets the other forms, and canonicalizes
2072          * everything.
2073          * @return \type{\bool} true on success
2074          */
2075         private function secureAndSplit() {
2076                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2077
2078                 # Initialisation
2079                 static $rxTc = false;
2080                 if( !$rxTc ) {
2081                         # Matching titles will be held as illegal.
2082                         $rxTc = '/' .
2083                                 # Any character not allowed is forbidden...
2084                                 '[^' . Title::legalChars() . ']' .
2085                                 # URL percent encoding sequences interfere with the ability
2086                                 # to round-trip titles -- you can't link to them consistently.
2087                                 '|%[0-9A-Fa-f]{2}' .
2088                                 # XML/HTML character references produce similar issues.
2089                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2090                                 '|&#[0-9]+;' .
2091                                 '|&#x[0-9A-Fa-f]+;' .
2092                                 '/S';
2093                 }
2094
2095                 $this->mInterwiki = $this->mFragment = '';
2096                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2097
2098                 $dbkey = $this->mDbkeyform;
2099
2100                 # Strip Unicode bidi override characters.
2101                 # Sometimes they slip into cut-n-pasted page titles, where the
2102                 # override chars get included in list displays.
2103                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2104
2105                 # Clean up whitespace
2106                 #
2107                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2108                 $dbkey = trim( $dbkey, '_' );
2109
2110                 if ( '' == $dbkey ) {
2111                         return false;
2112                 }
2113
2114                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2115                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2116                         return false;
2117                 }
2118
2119                 $this->mDbkeyform = $dbkey;
2120
2121                 # Initial colon indicates main namespace rather than specified default
2122                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2123                 if ( ':' == $dbkey{0} ) {
2124                         $this->mNamespace = NS_MAIN;
2125                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2126                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2127                 }
2128
2129                 # Namespace or interwiki prefix
2130                 $firstPass = true;
2131                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2132                 do {
2133                         $m = array();
2134                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2135                                 $p = $m[1];
2136                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2137                                         # Ordinary namespace
2138                                         $dbkey = $m[2];
2139                                         $this->mNamespace = $ns;
2140                                         # For Talk:X pages, check if X has a "namespace" prefix
2141                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2142                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2143                                                         return false; # Disallow Talk:File:x type titles...
2144                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2145                                                         return false; # Disallow Talk:Interwiki:x type titles...
2146                                         }
2147                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2148                                         if( !$firstPass ) {
2149                                                 # Can't make a local interwiki link to an interwiki link.
2150                                                 # That's just crazy!
2151                                                 return false;
2152                                         }
2153
2154                                         # Interwiki link
2155                                         $dbkey = $m[2];
2156                                         $this->mInterwiki = $wgContLang->lc( $p );
2157
2158                                         # Redundant interwiki prefix to the local wiki
2159                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2160                                                 if( $dbkey == '' ) {
2161                                                         # Can't have an empty self-link
2162                                                         return false;
2163                                                 }
2164                                                 $this->mInterwiki = '';
2165                                                 $firstPass = false;
2166                                                 # Do another namespace split...
2167                                                 continue;
2168                                         }
2169
2170                                         # If there's an initial colon after the interwiki, that also
2171                                         # resets the default namespace
2172                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2173                                                 $this->mNamespace = NS_MAIN;
2174                                                 $dbkey = substr( $dbkey, 1 );
2175                                         }
2176                                 }
2177                                 # If there's no recognized interwiki or namespace,
2178                                 # then let the colon expression be part of the title.
2179                         }
2180                         break;
2181                 } while( true );
2182
2183                 # We already know that some pages won't be in the database!
2184                 #
2185                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2186                         $this->mArticleID = 0;
2187                 }
2188                 $fragment = strstr( $dbkey, '#' );
2189                 if ( false !== $fragment ) {
2190                         $this->setFragment( $fragment );
2191                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2192                         # remove whitespace again: prevents "Foo_bar_#"
2193                         # becoming "Foo_bar_"
2194                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2195                 }
2196
2197                 # Reject illegal characters.
2198                 #
2199                 if( preg_match( $rxTc, $dbkey ) ) {
2200                         return false;
2201                 }
2202
2203                 /**
2204                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2205                  * reachable due to the way web browsers deal with 'relative' URLs.
2206                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2207                  */
2208                 if ( strpos( $dbkey, '.' ) !== false &&
2209                      ( $dbkey === '.' || $dbkey === '..' ||
2210                        strpos( $dbkey, './' ) === 0  ||
2211                        strpos( $dbkey, '../' ) === 0 ||
2212                        strpos( $dbkey, '/./' ) !== false ||
2213                        strpos( $dbkey, '/../' ) !== false  ||
2214                        substr( $dbkey, -2 ) == '/.' ||
2215                        substr( $dbkey, -3 ) == '/..' ) )
2216                 {
2217                         return false;
2218                 }
2219
2220                 /**
2221                  * Magic tilde sequences? Nu-uh!
2222                  */
2223                 if( strpos( $dbkey, '~~~' ) !== false ) {
2224                         return false;
2225                 }
2226
2227                 /**
2228                  * Limit the size of titles to 255 bytes.
2229                  * This is typically the size of the underlying database field.
2230                  * We make an exception for special pages, which don't need to be stored
2231                  * in the database, and may edge over 255 bytes due to subpage syntax
2232                  * for long titles, e.g. [[Special:Block/Long name]]
2233                  */
2234                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2235                   strlen( $dbkey ) > 512 )
2236                 {
2237                         return false;
2238                 }
2239
2240                 /**
2241                  * Normally, all wiki links are forced to have
2242                  * an initial capital letter so [[foo]] and [[Foo]]
2243                  * point to the same place.
2244                  *
2245                  * Don't force it for interwikis, since the other
2246                  * site might be case-sensitive.
2247                  */
2248                 $this->mUserCaseDBKey = $dbkey;
2249                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2250                         $dbkey = $wgContLang->ucfirst( $dbkey );
2251                 }
2252
2253                 /**
2254                  * Can't make a link to a namespace alone...
2255                  * "empty" local links can only be self-links
2256                  * with a fragment identifier.
2257                  */
2258                 if( $dbkey == '' &&
2259                         $this->mInterwiki == '' &&
2260                         $this->mNamespace != NS_MAIN ) {
2261                         return false;
2262                 }
2263                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2264                 // IP names are not allowed for accounts, and can only be referring to
2265                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2266                 // there are numerous ways to present the same IP. Having sp:contribs scan
2267                 // them all is silly and having some show the edits and others not is
2268                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2269                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2270                         IP::sanitizeIP( $dbkey ) : $dbkey;
2271                 // Any remaining initial :s are illegal.
2272                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2273                         return false;
2274                 }
2275
2276                 # Fill fields
2277                 $this->mDbkeyform = $dbkey;
2278                 $this->mUrlform = wfUrlencode( $dbkey );
2279
2280                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2281
2282                 return true;
2283         }
2284
2285         /**
2286          * Set the fragment for this title. Removes the first character from the
2287          * specified fragment before setting, so it assumes you're passing it with
2288          * an initial "#".
2289          *
2290          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2291          * Still in active use privately.
2292          *
2293          * @param $fragment \type{\string} text
2294          */
2295         public function setFragment( $fragment ) {
2296                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2297         }
2298
2299         /**
2300          * Get a Title object associated with the talk page of this article
2301          * @return \type{Title} the object for the talk page
2302          */
2303         public function getTalkPage() {
2304                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2305         }
2306
2307         /**
2308          * Get a title object associated with the subject page of this
2309          * talk page
2310          *
2311          * @return \type{Title} the object for the subject page
2312          */
2313         public function getSubjectPage() {
2314                 // Is this the same title?
2315                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2316                 if( $this->getNamespace() == $subjectNS ) {
2317                         return $this;
2318                 }
2319                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2320         }
2321
2322         /**
2323          * Get an array of Title objects linking to this Title
2324          * Also stores the IDs in the link cache.
2325          *
2326          * WARNING: do not use this function on arbitrary user-supplied titles!
2327          * On heavily-used templates it will max out the memory.
2328          *
2329          * @param $options \type{\string} may be FOR UPDATE
2330          * @return \type{\arrayof{Title}} the Title objects linking here
2331          */
2332         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2333                 $linkCache = LinkCache::singleton();
2334
2335                 if ( $options ) {
2336                         $db = wfGetDB( DB_MASTER );
2337                 } else {
2338                         $db = wfGetDB( DB_SLAVE );
2339                 }
2340
2341                 $res = $db->select( array( 'page', $table ),
2342                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2343                         array(
2344                                 "{$prefix}_from=page_id",
2345                                 "{$prefix}_namespace" => $this->getNamespace(),
2346                                 "{$prefix}_title"     => $this->getDBkey() ),
2347                         __METHOD__,
2348                         $options );
2349
2350                 $retVal = array();
2351                 if ( $db->numRows( $res ) ) {
2352                         foreach( $res as $row ) {
2353                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2354                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2355                                         $retVal[] = $titleObj;
2356                                 }
2357                         }
2358                 }
2359                 $db->freeResult( $res );
2360                 return $retVal;
2361         }
2362
2363         /**
2364          * Get an array of Title objects using this Title as a template
2365          * Also stores the IDs in the link cache.
2366          *
2367          * WARNING: do not use this function on arbitrary user-supplied titles!
2368          * On heavily-used templates it will max out the memory.
2369          *
2370          * @param $options \type{\string} may be FOR UPDATE
2371          * @return \type{\arrayof{Title}} the Title objects linking here
2372          */
2373         public function getTemplateLinksTo( $options = '' ) {
2374                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2375         }
2376
2377         /**
2378          * Get an array of Title objects referring to non-existent articles linked from this page
2379          *
2380          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2381          * @param $options \type{\string} may be FOR UPDATE
2382          * @return \type{\arrayof{Title}} the Title objects
2383          */
2384         public function getBrokenLinksFrom( $options = '' ) {
2385                 if ( $this->getArticleId() == 0 ) {
2386                         # All links from article ID 0 are false positives
2387                         return array();
2388                 }
2389
2390                 if ( $options ) {
2391                         $db = wfGetDB( DB_MASTER );
2392                 } else {
2393                         $db = wfGetDB( DB_SLAVE );
2394                 }
2395
2396                 $res = $db->safeQuery(
2397                           "SELECT pl_namespace, pl_title
2398                              FROM !
2399                         LEFT JOIN !
2400                                ON pl_namespace=page_namespace
2401                               AND pl_title=page_title
2402                             WHERE pl_from=?
2403                               AND page_namespace IS NULL
2404                                   !",
2405                         $db->tableName( 'pagelinks' ),
2406                         $db->tableName( 'page' ),
2407                         $this->getArticleId(),
2408                         $options );
2409
2410                 $retVal = array();
2411                 if ( $db->numRows( $res ) ) {
2412                         foreach( $res as $row ) {
2413                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2414                         }
2415                 }
2416                 $db->freeResult( $res );
2417                 return $retVal;
2418         }
2419
2420
2421         /**
2422          * Get a list of URLs to purge from the Squid cache when this
2423          * page changes
2424          *
2425          * @return \type{\arrayof{\string}} the URLs
2426          */
2427         public function getSquidURLs() {
2428                 global $wgContLang;
2429
2430                 $urls = array(
2431                         $this->getInternalURL(),
2432                         $this->getInternalURL( 'action=history' )
2433                 );
2434
2435                 // purge variant urls as well
2436                 if($wgContLang->hasVariants()){
2437                         $variants = $wgContLang->getVariants();
2438                         foreach($variants as $vCode){
2439                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2440                                 $urls[] = $this->getInternalURL('',$vCode);
2441                         }
2442                 }
2443
2444                 return $urls;
2445         }
2446
2447         /**
2448          * Purge all applicable Squid URLs
2449          */
2450         public function purgeSquid() {
2451                 global $wgUseSquid;
2452                 if ( $wgUseSquid ) {
2453                         $urls = $this->getSquidURLs();
2454                         $u = new SquidUpdate( $urls );
2455                         $u->doUpdate();
2456                 }
2457         }
2458
2459         /**
2460          * Move this page without authentication
2461          * @param &$nt \type{Title} the new page Title
2462          */
2463         public function moveNoAuth( &$nt ) {
2464                 return $this->moveTo( $nt, false );
2465         }
2466
2467         /**
2468          * Check whether a given move operation would be valid.
2469          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2470          * @param &$nt \type{Title} the new title
2471          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2472          *      should be checked
2473          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2474          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2475          */
2476         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2477                 global $wgUser;
2478
2479                 $errors = array();
2480                 if( !$nt ) {
2481                         // Normally we'd add this to $errors, but we'll get
2482                         // lots of syntax errors if $nt is not an object
2483                         return array(array('badtitletext'));
2484                 }
2485                 if( $this->equals( $nt ) ) {
2486                         $errors[] = array('selfmove');
2487                 }
2488                 if( !$this->isMovable() ) {
2489                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2490                 }
2491                 if ( $nt->getInterwiki() != '' ) {
2492                         $errors[] = array( 'immobile-target-namespace-iw' );
2493                 }
2494                 if ( !$nt->isMovable() ) {
2495                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2496                 }
2497
2498                 $oldid = $this->getArticleID();
2499                 $newid = $nt->getArticleID();
2500
2501                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2502                         $errors[] = array('articleexists');
2503                 }
2504                 if ( ( '' == $this->getDBkey() ) ||
2505                          ( !$oldid ) ||
2506                      ( '' == $nt->getDBkey() ) ) {
2507                         $errors[] = array('badarticleerror');
2508                 }
2509
2510                 // Image-specific checks
2511                 if( $this->getNamespace() == NS_FILE ) {
2512                         $file = wfLocalFile( $this );
2513                         if( $file->exists() ) {
2514                                 if( $nt->getNamespace() != NS_FILE ) {
2515                                         $errors[] = array('imagenocrossnamespace');
2516                                 }
2517                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2518                                         $errors[] = array('imageinvalidfilename');
2519                                 }
2520                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBKey() ) ) {
2521                                         $errors[] = array('imagetypemismatch');
2522                                 }
2523                         }
2524                 }
2525
2526                 if ( $auth ) {
2527                         $errors = wfMergeErrorArrays( $errors,
2528                                 $this->getUserPermissionsErrors('move', $wgUser),
2529                                 $this->getUserPermissionsErrors('edit', $wgUser),
2530                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2531                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2532                 }
2533
2534                 $match = EditPage::matchSpamRegex( $reason );
2535                 if( $match !== false ) {
2536                         // This is kind of lame, won't display nice
2537                         $errors[] = array('spamprotectiontext');
2538                 }
2539
2540                 $err = null;
2541                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2542                         $errors[] = array('hookaborted', $err);
2543                 }
2544
2545                 # The move is allowed only if (1) the target doesn't exist, or
2546                 # (2) the target is a redirect to the source, and has no history
2547                 # (so we can undo bad moves right after they're done).
2548
2549                 if ( 0 != $newid ) { # Target exists; check for validity
2550                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2551                                 $errors[] = array('articleexists');
2552                         }
2553                 } else {
2554                         $tp = $nt->getTitleProtection();
2555                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2556                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2557                                 $errors[] = array('cantmove-titleprotected');
2558                         }
2559                 }
2560                 if(empty($errors))
2561                         return true;
2562                 return $errors;
2563         }
2564
2565         /**
2566          * Move a title to a new location
2567          * @param &$nt \type{Title} the new title
2568          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2569          *      should be checked
2570          * @param $reason \type{\string} The reason for the move
2571          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2572          *  Ignored if the user doesn't have the suppressredirect right.
2573          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2574          */
2575         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2576                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2577                 if( is_array( $err ) ) {
2578                         return $err;
2579                 }
2580
2581                 $pageid = $this->getArticleID();
2582                 $protected = $this->isProtected();
2583                 if( $nt->exists() ) {
2584                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2585                         $pageCountChange = ($createRedirect ? 0 : -1);
2586                 } else { # Target didn't exist, do normal move.
2587                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2588                         $pageCountChange = ($createRedirect ? 1 : 0);
2589                 }
2590
2591                 if( is_array( $err ) ) {
2592                         return $err;
2593                 }
2594                 $redirid = $this->getArticleID();
2595
2596                 // Category memberships include a sort key which may be customized.
2597                 // If it's left as the default (the page title), we need to update
2598                 // the sort key to match the new title.
2599                 //
2600                 // Be careful to avoid resetting cl_timestamp, which may disturb
2601                 // time-based lists on some sites.
2602                 //
2603                 // Warning -- if the sort key is *explicitly* set to the old title,
2604                 // we can't actually distinguish it from a default here, and it'll
2605                 // be set to the new title even though it really shouldn't.
2606                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2607                 $dbw = wfGetDB( DB_MASTER );
2608                 $dbw->update( 'categorylinks',
2609                         array(
2610                                 'cl_sortkey' => $nt->getPrefixedText(),
2611                                 'cl_timestamp=cl_timestamp' ),
2612                         array(
2613                                 'cl_from' => $pageid,
2614                                 'cl_sortkey' => $this->getPrefixedText() ),
2615                         __METHOD__ );
2616
2617                 if( $protected ) {
2618                         # Protect the redirect title as the title used to be...
2619                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2620                                 array(
2621                                         'pr_page'    => $redirid,
2622                                         'pr_type'    => 'pr_type',
2623                                         'pr_level'   => 'pr_level',
2624                                         'pr_cascade' => 'pr_cascade',
2625                                         'pr_user'    => 'pr_user',
2626                                         'pr_expiry'  => 'pr_expiry'
2627                                 ),
2628                                 array( 'pr_page' => $pageid ),
2629                                 __METHOD__,
2630                                 array( 'IGNORE' )
2631                         );
2632                         # Update the protection log
2633                         $log = new LogPage( 'protect' );
2634                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2635                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2636                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2637                 }
2638
2639                 # Update watchlists
2640                 $oldnamespace = $this->getNamespace() & ~1;
2641                 $newnamespace = $nt->getNamespace() & ~1;
2642                 $oldtitle = $this->getDBkey();
2643                 $newtitle = $nt->getDBkey();
2644
2645                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2646                         WatchedItem::duplicateEntries( $this, $nt );
2647                 }
2648
2649                 # Update search engine
2650                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2651                 $u->doUpdate();
2652                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2653                 $u->doUpdate();
2654
2655                 # Update site_stats
2656                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2657                         # No longer a content page
2658                         # Not viewed, edited, removing
2659                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2660                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2661                         # Now a content page
2662                         # Not viewed, edited, adding
2663                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2664                 } elseif( $pageCountChange ) {
2665                         # Redirect added
2666                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2667                 } else {
2668                         # Nothing special
2669                         $u = false;
2670                 }
2671                 if( $u )
2672                         $u->doUpdate();
2673                 # Update message cache for interface messages
2674                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2675                         global $wgMessageCache;
2676                         $oldarticle = new Article( $this );
2677                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2678                         $newarticle = new Article( $nt );
2679                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2680                 }
2681
2682                 global $wgUser;
2683                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2684                 return true;
2685         }
2686
2687         /**
2688          * Move page to a title which is at present a redirect to the
2689          * source page
2690          *
2691          * @param &$nt \type{Title} the page to move to, which should currently
2692          *      be a redirect
2693          * @param $reason \type{\string} The reason for the move
2694          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2695          *  Ignored if the user doesn't have the suppressredirect right
2696          */
2697         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2698                 global $wgUseSquid, $wgUser;
2699                 $fname = 'Title::moveOverExistingRedirect';
2700                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2701
2702                 if ( $reason ) {
2703                         $comment .= ": $reason";
2704                 }
2705
2706                 $now = wfTimestampNow();
2707                 $newid = $nt->getArticleID();
2708                 $oldid = $this->getArticleID();
2709                 $latest = $this->getLatestRevID();
2710
2711                 $dbw = wfGetDB( DB_MASTER );
2712
2713                 # Delete the old redirect. We don't save it to history since
2714                 # by definition if we've got here it's rather uninteresting.
2715                 # We have to remove it so that the next step doesn't trigger
2716                 # a conflict on the unique namespace+title index...
2717                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2718                 if ( !$dbw->cascadingDeletes() ) {
2719                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2720                         global $wgUseTrackbacks;
2721                         if ($wgUseTrackbacks)
2722                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2723                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2724                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2725                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2726                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2727                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2728                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2729                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2730                 }
2731
2732                 # Save a null revision in the page's history notifying of the move
2733                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2734                 $nullRevId = $nullRevision->insertOn( $dbw );
2735
2736                 $article = new Article( $this );
2737                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2738
2739                 # Change the name of the target page:
2740                 $dbw->update( 'page',
2741                         /* SET */ array(
2742                                 'page_touched'   => $dbw->timestamp($now),
2743                                 'page_namespace' => $nt->getNamespace(),
2744                                 'page_title'     => $nt->getDBkey(),
2745                                 'page_latest'    => $nullRevId,
2746                         ),
2747                         /* WHERE */ array( 'page_id' => $oldid ),
2748                         $fname
2749                 );
2750                 $nt->resetArticleID( $oldid );
2751
2752                 # Recreate the redirect, this time in the other direction.
2753                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2754                         $mwRedir = MagicWord::get( 'redirect' );
2755                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2756                         $redirectArticle = new Article( $this );
2757                         $newid = $redirectArticle->insertOn( $dbw );
2758                         $redirectRevision = new Revision( array(
2759                                 'page'    => $newid,
2760                                 'comment' => $comment,
2761                                 'text'    => $redirectText ) );
2762                         $redirectRevision->insertOn( $dbw );
2763                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2764
2765                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2766
2767                         # Now, we record the link from the redirect to the new title.
2768                         # It should have no other outgoing links...
2769                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2770                         $dbw->insert( 'pagelinks',
2771                                 array(
2772                                         'pl_from'      => $newid,
2773                                         'pl_namespace' => $nt->getNamespace(),
2774                                         'pl_title'     => $nt->getDBkey() ),
2775                                 $fname );
2776                         $redirectSuppressed = false;
2777                 } else {
2778                         $this->resetArticleID( 0 );
2779                         $redirectSuppressed = true;
2780                 }
2781
2782                 # Move an image if this is a file
2783                 if( $this->getNamespace() == NS_FILE ) {
2784                         $file = wfLocalFile( $this );
2785                         if( $file->exists() ) {
2786                                 $status = $file->move( $nt );
2787                                 if( !$status->isOk() ) {
2788                                         $dbw->rollback();
2789                                         return $status->getErrorsArray();
2790                                 }
2791                         }
2792                 }
2793
2794                 # Log the move
2795                 $log = new LogPage( 'move' );
2796                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2797
2798                 # Purge squid
2799                 if ( $wgUseSquid ) {
2800                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2801                         $u = new SquidUpdate( $urls );
2802                         $u->doUpdate();
2803                 }
2804
2805         }
2806
2807         /**
2808          * Move page to non-existing title.
2809          * @param &$nt \type{Title} the new Title
2810          * @param $reason \type{\string} The reason for the move
2811          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2812          *  Ignored if the user doesn't have the suppressredirect right
2813          */
2814         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2815                 global $wgUseSquid, $wgUser;
2816                 $fname = 'MovePageForm::moveToNewTitle';
2817                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2818                 if ( $reason ) {
2819                         $comment .= wfMsgExt( 'colon-separator',
2820                                 array( 'escapenoentities', 'content' ) );
2821                         $comment .= $reason;
2822                 }
2823
2824                 $newid = $nt->getArticleID();
2825                 $oldid = $this->getArticleID();
2826                 $latest = $this->getLatestRevId();
2827
2828                 $dbw = wfGetDB( DB_MASTER );
2829                 $now = $dbw->timestamp();
2830
2831                 # Save a null revision in the page's history notifying of the move
2832                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2833                 $nullRevId = $nullRevision->insertOn( $dbw );
2834
2835                 $article = new Article( $this );
2836                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2837
2838                 # Rename page entry
2839                 $dbw->update( 'page',
2840                         /* SET */ array(
2841                                 'page_touched'   => $now,
2842                                 'page_namespace' => $nt->getNamespace(),
2843                                 'page_title'     => $nt->getDBkey(),
2844                                 'page_latest'    => $nullRevId,
2845                         ),
2846                         /* WHERE */ array( 'page_id' => $oldid ),
2847                         $fname
2848                 );
2849                 $nt->resetArticleID( $oldid );
2850
2851                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2852                         # Insert redirect
2853                         $mwRedir = MagicWord::get( 'redirect' );
2854                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2855                         $redirectArticle = new Article( $this );
2856                         $newid = $redirectArticle->insertOn( $dbw );
2857                         $redirectRevision = new Revision( array(
2858                                 'page'    => $newid,
2859                                 'comment' => $comment,
2860                                 'text'    => $redirectText ) );
2861                         $redirectRevision->insertOn( $dbw );
2862                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2863
2864                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2865
2866                         # Record the just-created redirect's linking to the page
2867                         $dbw->insert( 'pagelinks',
2868                                 array(
2869                                         'pl_from'      => $newid,
2870                                         'pl_namespace' => $nt->getNamespace(),
2871                                         'pl_title'     => $nt->getDBkey() ),
2872                                 $fname );
2873                         $redirectSuppressed = false;
2874                 } else {
2875                         $this->resetArticleID( 0 );
2876                         $redirectSuppressed = true;
2877                 }
2878
2879                 # Move an image if this is a file
2880                 if( $this->getNamespace() == NS_FILE ) {
2881                         $file = wfLocalFile( $this );
2882                         if( $file->exists() ) {
2883                                 $status = $file->move( $nt );
2884                                 if( !$status->isOk() ) {
2885                                         $dbw->rollback();
2886                                         return $status->getErrorsArray();
2887                                 }
2888                         }
2889                 }
2890
2891                 # Log the move
2892                 $log = new LogPage( 'move' );
2893                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2894
2895                 # Purge caches as per article creation
2896                 Article::onArticleCreate( $nt );
2897
2898                 # Purge old title from squid
2899                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2900                 $this->purgeSquid();
2901
2902         }
2903
2904         /**
2905          * Checks if this page is just a one-rev redirect.
2906          * Adds lock, so don't use just for light purposes.
2907          *
2908          * @return \type{\bool} TRUE or FALSE
2909          */
2910         public function isSingleRevRedirect() {
2911                 $dbw = wfGetDB( DB_MASTER );
2912                 # Is it a redirect?
2913                 $row = $dbw->selectRow( 'page',
2914                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
2915                         $this->pageCond(),
2916                         __METHOD__,
2917                         'FOR UPDATE'
2918                 );
2919                 # Cache some fields we may want
2920                 $this->mArticleID = $row ? intval($row->page_id) : 0;
2921                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
2922                 $this->mLatestID = $row ? intval($row->page_latest) : false;
2923                 if( !$this->mRedirect ) {
2924                         return false;
2925                 }
2926                 # Does the article have a history?
2927                 $row = $dbw->selectField( array( 'page', 'revision'),
2928                         'rev_id',
2929                         array( 'page_namespace' => $this->getNamespace(),
2930                                 'page_title' => $this->getDBkey(),
2931                                 'page_id=rev_page',
2932                                 'page_latest != rev_id'
2933                         ),
2934                         __METHOD__,
2935                         'FOR UPDATE'
2936                 );
2937                 # Return true if there was no history
2938                 return ($row === false);
2939         }
2940
2941         /**
2942          * Checks if $this can be moved to a given Title
2943          * - Selects for update, so don't call it unless you mean business
2944          *
2945          * @param &$nt \type{Title} the new title to check
2946          * @return \type{\bool} TRUE or FALSE
2947          */
2948         public function isValidMoveTarget( $nt ) {
2949                 $dbw = wfGetDB( DB_MASTER );
2950                 # Is it an existsing file?
2951                 if( $nt->getNamespace() == NS_FILE ) {
2952                         $file = wfLocalFile( $nt );
2953                         if( $file->exists() ) {
2954                                 wfDebug( __METHOD__ . ": file exists\n" );
2955                                 return false;
2956                         }
2957                 }
2958                 # Is it a redirect with no history?
2959                 if( !$nt->isSingleRevRedirect() ) {
2960                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
2961                         return false;
2962                 }
2963                 # Get the article text
2964                 $rev = Revision::newFromTitle( $nt );
2965                 $text = $rev->getText();
2966                 # Does the redirect point to the source?
2967                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2968                 $m = array();
2969                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2970                         $redirTitle = Title::newFromText( $m[1] );
2971                         if( !is_object( $redirTitle ) ||
2972                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2973                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2974                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2975                                 return false;
2976                         }
2977                 } else {
2978                         # Fail safe
2979                         wfDebug( __METHOD__ . ": failsafe\n" );
2980                         return false;
2981                 }
2982                 return true;
2983         }
2984
2985         /**
2986          * Can this title be added to a user's watchlist?
2987          *
2988          * @return \type{\bool} TRUE or FALSE
2989          */
2990         public function isWatchable() {
2991                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
2992         }
2993
2994         /**
2995          * Get categories to which this Title belongs and return an array of
2996          * categories' names.
2997          *
2998          * @return \type{\array} array an array of parents in the form:
2999          *      $parent => $currentarticle
3000          */
3001         public function getParentCategories() {
3002                 global $wgContLang;
3003
3004                 $titlekey = $this->getArticleId();
3005                 $dbr = wfGetDB( DB_SLAVE );
3006                 $categorylinks = $dbr->tableName( 'categorylinks' );
3007
3008                 # NEW SQL
3009                 $sql = "SELECT * FROM $categorylinks"
3010                      ." WHERE cl_from='$titlekey'"
3011                          ." AND cl_from <> '0'"
3012                          ." ORDER BY cl_sortkey";
3013
3014                 $res = $dbr->query( $sql );
3015
3016                 if( $dbr->numRows( $res ) > 0 ) {
3017                         foreach( $res as $row )
3018                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3019                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3020                         $dbr->freeResult( $res );
3021                 } else {
3022                         $data = array();
3023                 }
3024                 return $data;
3025         }
3026
3027         /**
3028          * Get a tree of parent categories
3029          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3030          * @return \type{\array} Tree of parent categories
3031          */
3032         public function getParentCategoryTree( $children = array() ) {
3033                 $stack = array();
3034                 $parents = $this->getParentCategories();
3035
3036                 if( $parents ) {
3037                         foreach( $parents as $parent => $current ) {
3038                                 if ( array_key_exists( $parent, $children ) ) {
3039                                         # Circular reference
3040                                         $stack[$parent] = array();
3041                                 } else {
3042                                         $nt = Title::newFromText($parent);
3043                                         if ( $nt ) {
3044                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3045                                         }
3046                                 }
3047                         }
3048                         return $stack;
3049                 } else {
3050                         return array();
3051                 }
3052         }
3053
3054
3055         /**
3056          * Get an associative array for selecting this title from
3057          * the "page" table
3058          *
3059          * @return \type{\array} Selection array
3060          */
3061         public function pageCond() {
3062                 if( $this->mArticleID > 0 ) {
3063                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3064                         return array( 'page_id' => $this->mArticleID );
3065                 } else {
3066                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3067                 }
3068         }
3069
3070         /**
3071          * Get the revision ID of the previous revision
3072          *
3073          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3074          * @param $flags \type{\int} GAID_FOR_UPDATE
3075          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3076          */
3077         public function getPreviousRevisionID( $revId, $flags=0 ) {
3078                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3079                 return $db->selectField( 'revision', 'rev_id',
3080                         array(
3081                                 'rev_page' => $this->getArticleId($flags),
3082                                 'rev_id < ' . intval( $revId )
3083                         ),
3084                         __METHOD__,
3085                         array( 'ORDER BY' => 'rev_id DESC' )
3086                 );
3087         }
3088
3089         /**
3090          * Get the revision ID of the next revision
3091          *
3092          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3093          * @param $flags \type{\int} GAID_FOR_UPDATE
3094          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3095          */
3096         public function getNextRevisionID( $revId, $flags=0 ) {
3097                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3098                 return $db->selectField( 'revision', 'rev_id',
3099                         array(
3100                                 'rev_page' => $this->getArticleId($flags),
3101                                 'rev_id > ' . intval( $revId )
3102                         ),
3103                         __METHOD__,
3104                         array( 'ORDER BY' => 'rev_id' )
3105                 );
3106         }
3107
3108         /**
3109          * Get the first revision of the page
3110          *
3111          * @param $flags \type{\int} GAID_FOR_UPDATE
3112          * @return Revision (or NULL if page doesn't exist)
3113          */
3114         public function getFirstRevision( $flags=0 ) {
3115                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3116                 $pageId = $this->getArticleId($flags);
3117                 if( !$pageId ) return NULL;
3118                 $row = $db->selectRow( 'revision', '*',
3119                         array( 'rev_page' => $pageId ),
3120                         __METHOD__,
3121                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3122                 );
3123                 if( !$row ) {
3124                         return NULL;
3125                 } else {
3126                         return new Revision( $row );
3127                 }
3128         }
3129
3130         /**
3131          * Check if this is a new page
3132          *
3133          * @return bool
3134          */
3135         public function isNewPage() {
3136                 $dbr = wfGetDB( DB_SLAVE );
3137                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3138         }
3139
3140         /**
3141          * Get the oldest revision timestamp of this page
3142          *
3143          * @return string, MW timestamp
3144          */
3145         public function getEarliestRevTime() {
3146                 $dbr = wfGetDB( DB_SLAVE );
3147                 if( $this->exists() ) {
3148                         $min = $dbr->selectField( 'revision',
3149                                 'MIN(rev_timestamp)',
3150                                 array( 'rev_page' => $this->getArticleId() ),
3151                                 __METHOD__ );
3152                         return wfTimestampOrNull( TS_MW, $min );
3153                 }
3154                 return null;
3155         }
3156
3157         /**
3158          * Get the number of revisions between the given revision IDs.
3159          * Used for diffs and other things that really need it.
3160          *
3161          * @param $old \type{\int} Revision ID.
3162          * @param $new \type{\int} Revision ID.
3163          * @return \type{\int} Number of revisions between these IDs.
3164          */
3165         public function countRevisionsBetween( $old, $new ) {
3166                 $dbr = wfGetDB( DB_SLAVE );
3167                 return $dbr->selectField( 'revision', 'count(*)',
3168                         'rev_page = ' . intval( $this->getArticleId() ) .
3169                         ' AND rev_id > ' . intval( $old ) .
3170                         ' AND rev_id < ' . intval( $new ),
3171                         __METHOD__,
3172                         array( 'USE INDEX' => 'PRIMARY' ) );
3173         }
3174
3175         /**
3176          * Compare with another title.
3177          *
3178          * @param \type{Title} $title
3179          * @return \type{\bool} TRUE or FALSE
3180          */
3181         public function equals( Title $title ) {
3182                 // Note: === is necessary for proper matching of number-like titles.
3183                 return $this->getInterwiki() === $title->getInterwiki()
3184                         && $this->getNamespace() == $title->getNamespace()
3185                         && $this->getDBkey() === $title->getDBkey();
3186         }
3187
3188         /**
3189          * Callback for usort() to do title sorts by (namespace, title)
3190          */
3191         static function compare( $a, $b ) {
3192                 if( $a->getNamespace() == $b->getNamespace() ) {
3193                         return strcmp( $a->getText(), $b->getText() );
3194                 } else {
3195                         return $a->getNamespace() - $b->getNamespace();
3196                 }
3197         }
3198
3199         /**
3200          * Return a string representation of this title
3201          *
3202          * @return \type{\string} String representation of this title
3203          */
3204         public function __toString() {
3205                 return $this->getPrefixedText();
3206         }
3207
3208         /**
3209          * Check if page exists.  For historical reasons, this function simply
3210          * checks for the existence of the title in the page table, and will
3211          * thus return false for interwiki links, special pages and the like.
3212          * If you want to know if a title can be meaningfully viewed, you should
3213          * probably call the isKnown() method instead.
3214          *
3215          * @return \type{\bool} TRUE or FALSE
3216          */
3217         public function exists() {
3218                 return $this->getArticleId() != 0;
3219         }
3220
3221         /**
3222          * Should links to this title be shown as potentially viewable (i.e. as
3223          * "bluelinks"), even if there's no record by this title in the page
3224          * table?
3225          *
3226          * This function is semi-deprecated for public use, as well as somewhat
3227          * misleadingly named.  You probably just want to call isKnown(), which
3228          * calls this function internally.
3229          *
3230          * (ISSUE: Most of these checks are cheap, but the file existence check
3231          * can potentially be quite expensive.  Including it here fixes a lot of
3232          * existing code, but we might want to add an optional parameter to skip
3233          * it and any other expensive checks.)
3234          *
3235          * @return \type{\bool} TRUE or FALSE
3236          */
3237         public function isAlwaysKnown() {
3238                 if( $this->mInterwiki != '' ) {
3239                         return true;  // any interwiki link might be viewable, for all we know
3240                 }
3241                 switch( $this->mNamespace ) {
3242                 case NS_MEDIA:
3243                 case NS_FILE:
3244                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3245                 case NS_SPECIAL:
3246                         return SpecialPage::exists( $this->getDBKey() );  // valid special page
3247                 case NS_MAIN:
3248                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3249                 case NS_MEDIAWIKI:
3250                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3251                         // the full l10n of that language to be loaded. That takes much memory and
3252                         // isn't needed. So we strip the language part away.
3253                         // Also, extension messages which are not loaded, are shown as red, because
3254                         // we don't call MessageCache::loadAllMessages.
3255                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3256                         return wfMsgWeirdKey( $basename );  // known system message
3257                 default:
3258                         return false;
3259                 }
3260         }
3261
3262         /**
3263          * Does this title refer to a page that can (or might) be meaningfully
3264          * viewed?  In particular, this function may be used to determine if
3265          * links to the title should be rendered as "bluelinks" (as opposed to
3266          * "redlinks" to non-existent pages).
3267          *
3268          * @return \type{\bool} TRUE or FALSE
3269          */
3270         public function isKnown() {
3271                 return $this->exists() || $this->isAlwaysKnown();
3272         }
3273
3274         /**
3275         * Is this in a namespace that allows actual pages?
3276         *
3277         * @return \type{\bool} TRUE or FALSE
3278         */
3279         public function canExist() {
3280                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3281         }
3282
3283         /**
3284          * Update page_touched timestamps and send squid purge messages for
3285          * pages linking to this title. May be sent to the job queue depending
3286          * on the number of links. Typically called on create and delete.
3287          */
3288         public function touchLinks() {
3289                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3290                 $u->doUpdate();
3291
3292                 if ( $this->getNamespace() == NS_CATEGORY ) {
3293                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3294                         $u->doUpdate();
3295                 }
3296         }
3297
3298         /**
3299          * Get the last touched timestamp
3300          * @param Database $db, optional db
3301          * @return \type{\string} Last touched timestamp
3302          */
3303         public function getTouched( $db = NULL ) {
3304                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3305                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3306                 return $touched;
3307         }
3308
3309         /**
3310          * Get the timestamp when this page was updated since the user last saw it.
3311          * @param User $user
3312          * @return mixed string/NULL
3313          */
3314         public function getNotificationTimestamp( $user = NULL ) {
3315                 global $wgUser, $wgShowUpdatedMarker;
3316                 // Assume current user if none given
3317                 if( !$user ) $user = $wgUser;
3318                 // Check cache first
3319                 $uid = $user->getId();
3320                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3321                         return $this->mNotificationTimestamp[$uid];
3322                 }
3323                 if( !$uid || !$wgShowUpdatedMarker ) {
3324                         return $this->mNotificationTimestamp[$uid] = false;
3325                 }
3326                 // Don't cache too much!
3327                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3328                         $this->mNotificationTimestamp = array();
3329                 }
3330                 $dbr = wfGetDB( DB_SLAVE );
3331                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3332                         'wl_notificationtimestamp',
3333                         array( 'wl_namespace' => $this->getNamespace(),
3334                                 'wl_title' => $this->getDBkey(),
3335                                 'wl_user' => $user->getId()
3336                         ),
3337                         __METHOD__
3338                 );
3339                 return $this->mNotificationTimestamp[$uid];
3340         }
3341
3342         /**
3343          * Get the trackback URL for this page
3344          * @return \type{\string} Trackback URL
3345          */
3346         public function trackbackURL() {
3347                 global $wgScriptPath, $wgServer;
3348
3349                 return "$wgServer$wgScriptPath/trackback.php?article="
3350                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3351         }
3352
3353         /**
3354          * Get the trackback RDF for this page
3355          * @return \type{\string} Trackback RDF
3356          */
3357         public function trackbackRDF() {
3358                 $url = htmlspecialchars($this->getFullURL());
3359                 $title = htmlspecialchars($this->getText());
3360                 $tburl = $this->trackbackURL();
3361
3362                 // Autodiscovery RDF is placed in comments so HTML validator
3363                 // won't barf. This is a rather icky workaround, but seems
3364                 // frequently used by this kind of RDF thingy.
3365                 //
3366                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3367                 return "<!--
3368 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3369          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3370          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3371 <rdf:Description
3372    rdf:about=\"$url\"
3373    dc:identifier=\"$url\"
3374    dc:title=\"$title\"
3375    trackback:ping=\"$tburl\" />
3376 </rdf:RDF>
3377 -->";
3378         }
3379
3380         /**
3381          * Generate strings used for xml 'id' names in monobook tabs
3382          * @return \type{\string} XML 'id' name
3383          */
3384         public function getNamespaceKey() {
3385                 global $wgContLang;
3386                 switch ($this->getNamespace()) {
3387                         case NS_MAIN:
3388                         case NS_TALK:
3389                                 return 'nstab-main';
3390                         case NS_USER:
3391                         case NS_USER_TALK:
3392                                 return 'nstab-user';
3393                         case NS_MEDIA:
3394                                 return 'nstab-media';
3395                         case NS_SPECIAL:
3396                                 return 'nstab-special';
3397                         case NS_PROJECT:
3398                         case NS_PROJECT_TALK:
3399                                 return 'nstab-project';
3400                         case NS_FILE:
3401                         case NS_FILE_TALK:
3402                                 return 'nstab-image';
3403                         case NS_MEDIAWIKI:
3404                         case NS_MEDIAWIKI_TALK:
3405                                 return 'nstab-mediawiki';
3406                         case NS_TEMPLATE:
3407                         case NS_TEMPLATE_TALK:
3408                                 return 'nstab-template';
3409                         case NS_HELP:
3410                         case NS_HELP_TALK:
3411                                 return 'nstab-help';
3412                         case NS_CATEGORY:
3413                         case NS_CATEGORY_TALK:
3414                                 return 'nstab-category';
3415                         default:
3416                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3417                 }
3418         }
3419
3420         /**
3421          * Returns true if this title resolves to the named special page
3422          * @param $name \type{\string} The special page name
3423          */
3424         public function isSpecial( $name ) {
3425                 if ( $this->getNamespace() == NS_SPECIAL ) {
3426                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3427                         if ( $name == $thisName ) {
3428                                 return true;
3429                         }
3430                 }
3431                 return false;
3432         }
3433
3434         /**
3435          * If the Title refers to a special page alias which is not the local default,
3436          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3437          */
3438         public function fixSpecialName() {
3439                 if ( $this->getNamespace() == NS_SPECIAL ) {
3440                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3441                         if ( $canonicalName ) {
3442                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3443                                 if ( $localName != $this->mDbkeyform ) {
3444                                         return Title::makeTitle( NS_SPECIAL, $localName );
3445                                 }
3446                         }
3447                 }
3448                 return $this;
3449         }
3450
3451         /**
3452          * Is this Title in a namespace which contains content?
3453          * In other words, is this a content page, for the purposes of calculating
3454          * statistics, etc?
3455          *
3456          * @return \type{\bool} TRUE or FALSE
3457          */
3458         public function isContentPage() {
3459                 return MWNamespace::isContent( $this->getNamespace() );
3460         }
3461
3462         /**
3463          * Get all extant redirects to this Title
3464          *
3465          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3466          *            NULL to consider all namespaces
3467          * @return \type{\arrayof{Title}} Redirects to this title
3468          */
3469         public function getRedirectsHere( $ns = null ) {
3470                 $redirs = array();
3471
3472                 $dbr = wfGetDB( DB_SLAVE );
3473                 $where = array(
3474                         'rd_namespace' => $this->getNamespace(),
3475                         'rd_title' => $this->getDBkey(),
3476                         'rd_from = page_id'
3477                 );
3478                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3479
3480                 $res = $dbr->select(
3481                         array( 'redirect', 'page' ),
3482                         array( 'page_namespace', 'page_title' ),
3483                         $where,
3484                         __METHOD__
3485                 );
3486
3487
3488                 foreach( $res as $row ) {
3489                         $redirs[] = self::newFromRow( $row );
3490                 }
3491                 return $redirs;
3492         }
3493
3494         /**
3495          * Check if this Title is a valid redirect target
3496          *
3497          * @return \type{\bool} TRUE or FALSE
3498          */
3499         public function isValidRedirectTarget() {
3500                 global $wgInvalidRedirectTargets;
3501
3502                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3503                 if( $this->isSpecial( 'Userlogout' ) ) {
3504                         return false;
3505                 }
3506
3507                 foreach( $wgInvalidRedirectTargets as $target ) {
3508                         if( $this->isSpecial( $target ) ) {
3509                                 return false;
3510                         }
3511                 }
3512
3513                 return true;
3514         }
3515 }