includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  * @file
   5  */
   6
   7 /**
   8  * @todo:  determine if it is really necessary to load this.  Appears to be left over from pre-autoloader versions, and
   9  *   is only really needed to provide access to constant UTF8_REPLACEMENT, which actually resides in UtfNormalDefines.php
  10  *   and is loaded by UtfNormalUtil.php, which is loaded by UtfNormal.php.
  11  */
  12 if ( !class_exists( 'UtfNormal' ) ) {
  13         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  14 }
  15
  16 define ( 'GAID_FOR_UPDATE', 1 );
  17
  18 /**
  19  * Represents a title within MediaWiki.
  20  * Optionally may contain an interwiki designation or namespace.
  21  * @note This class can fetch various kinds of data from the database;
  22  *       however, it does so inefficiently.
  23  *
  24  * @internal documentation reviewed 15 Mar 2010
  25  */
  26 class Title {
  27         /** @name Static cache variables */
  28         //@{
  29         static private $titleCache=array();
  30         static private $interwikiCache=array();
  31         //@}
  32
  33         /**
  34          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  35          * commonly used titles. On a batch operation this can become a memory leak
  36          * if not bounded. After hitting this many titles reset the cache.
  37          */
  38         const CACHE_MAX = 1000;
  39
  40
  41         /**
  42          * @name Private member variables
  43          * Please use the accessor functions instead.
  44          * @private
  45          */
  46         //@{
  47
  48         var $mTextform = '';              ///< Text form (spaces not underscores) of the main part
  49         var $mUrlform = '';               ///< URL-encoded form of the main part
  50         var $mDbkeyform = '';             ///< Main part with underscores
  51         var $mUserCaseDBKey;              ///< DB key with the initial letter in the case specified by the user
  52         var $mNamespace = NS_MAIN;        ///< Namespace index, i.e. one of the NS_xxxx constants
  53         var $mInterwiki = '';             ///< Interwiki prefix (or null string)
  54         var $mFragment;                   ///< Title fragment (i.e. the bit after the #)
  55         var $mArticleID = -1;             ///< Article ID, fetched from the link cache on demand
  56         var $mLatestID = false;           ///< ID of most recent revision
  57         var $mRestrictions = array();     ///< Array of groups allowed to edit this article
  58         var $mOldRestrictions = false;
  59         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  60         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  61         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  62         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  63         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  64         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  65         # Don't change the following default, NS_MAIN is hardcoded in several
  66         # places.  See bug 696.
  67         var $mDefaultNamespace = NS_MAIN; ///< Namespace index when there is no namespace
  68                                           # Zero except in {{transclusion}} tags
  69         var $mWatched = null;             ///< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  70         var $mLength = -1;                ///< The page length, 0 for special pages
  71         var $mRedirect = null;            ///< Is the article at this title a redirect?
  72         var $mNotificationTimestamp = array(); ///< Associative array of user ID -> timestamp/false
  73         var $mBacklinkCache = null;       ///< Cache of links to this title
  74         //@}
  75
  76
  77         /**
  78          * Constructor
  79          * @private
  80          */
  81         /* private */ function __construct() {}
  82
  83         /**
  84          * Create a new Title from a prefixed DB key
  85          * @param $key \type{\string} The database key, which has underscores
  86          *      instead of spaces, possibly including namespace and
  87          *      interwiki prefixes
  88          * @return \type{Title} the new object, or NULL on an error
  89          */
  90         public static function newFromDBkey( $key ) {
  91                 $t = new Title();
  92                 $t->mDbkeyform = $key;
  93                 if( $t->secureAndSplit() )
  94                         return $t;
  95                 else
  96                         return null;
  97         }
  98
  99         /**
 100          * Create a new Title from text, such as what one would find in a link. De-
 101          * codes any HTML entities in the text.
 102          *
 103          * @param $text string  The link text; spaces, prefixes, and an
 104          *   initial ':' indicating the main namespace are accepted.
 105          * @param $defaultNamespace int The namespace to use if none is speci-
 106          *   fied by a prefix.  If you want to force a specific namespace even if
 107          *   $text might begin with a namespace prefix, use makeTitle() or
 108          *   makeTitleSafe().
 109          * @return Title  The new object, or null on an error.
 110          */
 111         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 112                 if( is_object( $text ) ) {
 113                         throw new MWException( 'Title::newFromText given an object' );
 114                 }
 115
 116                 /**
 117                  * Wiki pages often contain multiple links to the same page.
 118                  * Title normalization and parsing can become expensive on
 119                  * pages with many links, so we can save a little time by
 120                  * caching them.
 121                  *
 122                  * In theory these are value objects and won't get changed...
 123                  */
 124                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 125                         return Title::$titleCache[$text];
 126                 }
 127
 128                 /**
 129                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 130                  */
 131                 $filteredText = Sanitizer::decodeCharReferences( $text );
 132
 133                 $t = new Title();
 134                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 135                 $t->mDefaultNamespace = $defaultNamespace;
 136
 137                 static $cachedcount = 0 ;
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( $cachedcount >= self::CACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         Title::$titleCache = array();
 143                                         $cachedcount=0;
 144                                 }
 145                                 $cachedcount++;
 146                                 Title::$titleCache[$text] =& $t;
 147                         }
 148                         return $t;
 149                 } else {
 150                         $ret = null;
 151                         return $ret;
 152                 }
 153         }
 154
 155         /**
 156          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 157          *
 158          * Example of wrong and broken code:
 159          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 160          *
 161          * Example of right code:
 162          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 163          *
 164          * Create a new Title from URL-encoded text. Ensures that
 165          * the given title's length does not exceed the maximum.
 166          * @param $url \type{\string} the title, as might be taken from a URL
 167          * @return \type{Title} the new object, or NULL on an error
 168          */
 169         public static function newFromURL( $url ) {
 170                 global $wgLegalTitleChars;
 171                 $t = new Title();
 172
 173                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 174                 # but some URLs used it as a space replacement and they still come
 175                 # from some external search tools.
 176                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 177                         $url = str_replace( '+', ' ', $url );
 178                 }
 179
 180                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 181                 if( $t->secureAndSplit() ) {
 182                         return $t;
 183                 } else {
 184                         return null;
 185                 }
 186         }
 187
 188         /**
 189          * Create a new Title from an article ID
 190          *
 191          * @param $id \type{\int} the page_id corresponding to the Title to create
 192          * @param $flags \type{\int} use GAID_FOR_UPDATE to use master
 193          * @return \type{Title} the new object, or NULL on an error
 194          */
 195         public static function newFromID( $id, $flags = 0 ) {
 196                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 197                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 198                 if( $row !== false ) {
 199                         $title = Title::newFromRow( $row );
 200                 } else {
 201                         $title = null;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          * @param $ids \type{\arrayof{\int}} Array of IDs
 209          * @return \type{\arrayof{Title}} Array of Titles
 210          */
 211         public static function newFromIDs( $ids ) {
 212                 if ( !count( $ids ) ) {
 213                         return array();
 214                 }
 215                 $dbr = wfGetDB( DB_SLAVE );
 216                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 217                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 218
 219                 $titles = array();
 220                 foreach( $res as $row ) {
 221                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 222                 }
 223                 return $titles;
 224         }
 225
 226         /**
 227          * Make a Title object from a DB row
 228          * @param $row \type{Row} (needs at least page_title,page_namespace)
 229          * @return \type{Title} corresponding Title
 230          */
 231         public static function newFromRow( $row ) {
 232                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 233
 234                 $t->mArticleID = isset($row->page_id) ? intval($row->page_id) : -1;
 235                 $t->mLength = isset($row->page_len) ? intval($row->page_len) : -1;
 236                 $t->mRedirect = isset($row->page_is_redirect) ? (bool)$row->page_is_redirect : null;
 237                 $t->mLatestID = isset($row->page_latest) ? $row->page_latest : false;
 238
 239                 return $t;
 240         }
 241
 242         /**
 243          * Create a new Title from a namespace index and a DB key.
 244          * It's assumed that $ns and $title are *valid*, for instance when
 245          * they came directly from the database or a special page name.
 246          * For convenience, spaces are converted to underscores so that
 247          * eg user_text fields can be used directly.
 248          *
 249          * @param $ns \type{\int} the namespace of the article
 250          * @param $title \type{\string} the unprefixed database key form
 251          * @param $fragment \type{\string} The link fragment (after the "#")
 252          * @return \type{Title} the new object
 253          */
 254         public static function &makeTitle( $ns, $title, $fragment = '' ) {
 255                 $t = new Title();
 256                 $t->mInterwiki = '';
 257                 $t->mFragment = $fragment;
 258                 $t->mNamespace = $ns = intval( $ns );
 259                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 260                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 261                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 262                 $t->mTextform = str_replace( '_', ' ', $title );
 263                 return $t;
 264         }
 265
 266         /**
 267          * Create a new Title from a namespace index and a DB key.
 268          * The parameters will be checked for validity, which is a bit slower
 269          * than makeTitle() but safer for user-provided data.
 270          *
 271          * @param $ns \type{\int} the namespace of the article
 272          * @param $title \type{\string} the database key form
 273          * @param $fragment \type{\string} The link fragment (after the "#")
 274          * @return \type{Title} the new object, or NULL on an error
 275          */
 276         public static function makeTitleSafe( $ns, $title, $fragment = '' ) {
 277                 $t = new Title();
 278                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment );
 279                 if( $t->secureAndSplit() ) {
 280                         return $t;
 281                 } else {
 282                         return null;
 283                 }
 284         }
 285
 286         /**
 287          * Create a new Title for the Main Page
 288          * @return \type{Title} the new object
 289          */
 290         public static function newMainPage() {
 291                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 292                 // Don't give fatal errors if the message is broken
 293                 if ( !$title ) {
 294                         $title = Title::newFromText( 'Main Page' );
 295                 }
 296                 return $title;
 297         }
 298
 299         /**
 300          * Extract a redirect destination from a string and return the
 301          * Title, or null if the text doesn't contain a valid redirect
 302          * This will only return the very next target, useful for
 303          * the redirect table and other checks that don't need full recursion
 304          *
 305          * @param $text \type{\string} Text with possible redirect
 306          * @return \type{Title} The corresponding Title
 307          */
 308         public static function newFromRedirect( $text ) {
 309                 return self::newFromRedirectInternal( $text );
 310         }
 311
 312         /**
 313          * Extract a redirect destination from a string and return the
 314          * Title, or null if the text doesn't contain a valid redirect
 315          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 316          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 317          *
 318          * @param $text \type{\string} Text with possible redirect
 319          * @return \type{Title} The corresponding Title
 320          */
 321         public static function newFromRedirectRecurse( $text ) {
 322                 $titles = self::newFromRedirectArray( $text );
 323                 return $titles ? array_pop( $titles ) : null;
 324         }
 325
 326         /**
 327          * Extract a redirect destination from a string and return an
 328          * array of Titles, or null if the text doesn't contain a valid redirect
 329          * The last element in the array is the final destination after all redirects
 330          * have been resolved (up to $wgMaxRedirects times)
 331          *
 332          * @param $text \type{\string} Text with possible redirect
 333          * @return \type{\array} Array of Titles, with the destination last
 334          */
 335         public static function newFromRedirectArray( $text ) {
 336                 global $wgMaxRedirects;
 337                 // are redirects disabled?
 338                 if( $wgMaxRedirects < 1 )
 339                         return null;
 340                 $title = self::newFromRedirectInternal( $text );
 341                 if( is_null( $title ) )
 342                         return null;
 343                 // recursive check to follow double redirects
 344                 $recurse = $wgMaxRedirects;
 345                 $titles = array( $title );
 346                 while( --$recurse > 0 ) {
 347                         if( $title->isRedirect() ) {
 348                                 $article = new Article( $title, 0 );
 349                                 $newtitle = $article->getRedirectTarget();
 350                         } else {
 351                                 break;
 352                         }
 353                         // Redirects to some special pages are not permitted
 354                         if( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 355                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 356                                 $title = $newtitle;
 357                                 $titles[] = $newtitle;
 358                         } else {
 359                                 break;
 360                         }
 361                 }
 362                 return $titles;
 363         }
 364
 365         /**
 366          * Really extract the redirect destination
 367          * Do not call this function directly, use one of the newFromRedirect* functions above
 368          *
 369          * @param $text \type{\string} Text with possible redirect
 370          * @return \type{Title} The corresponding Title
 371          */
 372         protected static function newFromRedirectInternal( $text ) {
 373                 $redir = MagicWord::get( 'redirect' );
 374                 $text = trim($text);
 375                 if( $redir->matchStartAndRemove( $text ) ) {
 376                         // Extract the first link and see if it's usable
 377                         // Ensure that it really does come directly after #REDIRECT
 378                         // Some older redirects included a colon, so don't freak about that!
 379                         $m = array();
 380                         if( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 381                                 // Strip preceding colon used to "escape" categories, etc.
 382                                 // and URL-decode links
 383                                 if( strpos( $m[1], '%' ) !== false ) {
 384                                         // Match behavior of inline link parsing here;
 385                                         // don't interpret + as " " most of the time!
 386                                         // It might be safe to just use rawurldecode instead, though.
 387                                         $m[1] = urldecode( ltrim( $m[1], ':' ) );
 388                                 }
 389                                 $title = Title::newFromText( $m[1] );
 390                                 // If the title is a redirect to bad special pages or is invalid, return null
 391                                 if( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 392                                         return null;
 393                                 }
 394                                 return $title;
 395                         }
 396                 }
 397                 return null;
 398         }
 399
 400 #----------------------------------------------------------------------------
 401 #       Static functions
 402 #----------------------------------------------------------------------------
 403
 404         /**
 405          * Get the prefixed DB key associated with an ID
 406          * @param $id \type{\int} the page_id of the article
 407          * @return \type{Title} an object representing the article, or NULL
 408          *  if no such article was found
 409          */
 410         public static function nameOf( $id ) {
 411                 $dbr = wfGetDB( DB_SLAVE );
 412
 413                 $s = $dbr->selectRow( 'page',
 414                         array( 'page_namespace','page_title' ),
 415                         array( 'page_id' => $id ),
 416                         __METHOD__ );
 417                 if ( $s === false ) { return null; }
 418
 419                 $n = self::makeName( $s->page_namespace, $s->page_title );
 420                 return $n;
 421         }
 422
 423         /**
 424          * Get a regex character class describing the legal characters in a link
 425          * @return \type{\string} the list of characters, not delimited
 426          */
 427         public static function legalChars() {
 428                 global $wgLegalTitleChars;
 429                 return $wgLegalTitleChars;
 430         }
 431
 432         /**
 433          * Get a string representation of a title suitable for
 434          * including in a search index
 435          *
 436          * @param $ns \type{\int} a namespace index
 437          * @param $title \type{\string} text-form main part
 438          * @return \type{\string} a stripped-down title string ready for the
 439          *  search index
 440          */
 441         public static function indexTitle( $ns, $title ) {
 442                 global $wgContLang;
 443
 444                 $lc = SearchEngine::legalSearchChars() . '&#;';
 445                 $t = $wgContLang->normalizeForSearch( $title );
 446                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 447                 $t = $wgContLang->lc( $t );
 448
 449                 # Handle 's, s'
 450                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 451                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 452
 453                 $t = preg_replace( "/\\s+/", ' ', $t );
 454
 455                 if ( $ns == NS_FILE ) {
 456                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 457                 }
 458                 return trim( $t );
 459         }
 460
 461         /**
 462          * Make a prefixed DB key from a DB key and a namespace index
 463          * @param $ns \type{\int} numerical representation of the namespace
 464          * @param $title \type{\string} the DB key form the title
 465          * @param $fragment \type{\string} The link fragment (after the "#")
 466          * @return \type{\string} the prefixed form of the title
 467          */
 468         public static function makeName( $ns, $title, $fragment = '' ) {
 469                 global $wgContLang;
 470
 471                 $namespace = $wgContLang->getNsText( $ns );
 472                 $name = $namespace == '' ? $title : "$namespace:$title";
 473                 if ( strval( $fragment ) != '' ) {
 474                         $name .= '#' . $fragment;
 475                 }
 476                 return $name;
 477         }
 478
 479         /**
 480          * Determine whether the object refers to a page within
 481          * this project.
 482          *
 483          * @return \type{\bool} TRUE if this is an in-project interwiki link
 484          *      or a wikilink, FALSE otherwise
 485          */
 486         public function isLocal() {
 487                 if ( $this->mInterwiki != '' ) {
 488                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 489                 } else {
 490                         return true;
 491                 }
 492         }
 493
 494         /**
 495          * Determine whether the object refers to a page within
 496          * this project and is transcludable.
 497          *
 498          * @return \type{\bool} TRUE if this is transcludable
 499          */
 500         public function isTrans() {
 501                 if ($this->mInterwiki == '')
 502                         return false;
 503
 504                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 505         }
 506
 507         /**
 508          * Escape a text fragment, say from a link, for a URL
 509          *
 510          * @param $fragment string containing a URL or link fragment (after the "#")
 511          * @return string escaped string
 512          */
 513         static function escapeFragmentForURL( $fragment ) {
 514                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 515                 # fragments appear not to work in IE (at least up to 7) or in at least
 516                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 517                 # to care if they aren't encoded.
 518                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 519         }
 520
 521 #----------------------------------------------------------------------------
 522 #       Other stuff
 523 #----------------------------------------------------------------------------
 524
 525         /** Simple accessors */
 526         /**
 527          * Get the text form (spaces not underscores) of the main part
 528          * @return \type{\string} Main part of the title
 529          */
 530         public function getText() { return $this->mTextform; }
 531         /**
 532          * Get the URL-encoded form of the main part
 533          * @return \type{\string} Main part of the title, URL-encoded
 534          */
 535         public function getPartialURL() { return $this->mUrlform; }
 536         /**
 537          * Get the main part with underscores
 538          * @return \type{\string} Main part of the title, with underscores
 539          */
 540         public function getDBkey() { return $this->mDbkeyform; }
 541         /**
 542          * Get the namespace index, i.e.\ one of the NS_xxxx constants.
 543          * @return \type{\int} Namespace index
 544          */
 545         public function getNamespace() { return $this->mNamespace; }
 546         /**
 547          * Get the namespace text
 548          * @return \type{\string} Namespace text
 549          */
 550         public function getNsText() {
 551                 global $wgContLang;
 552
 553                 if ( $this->mInterwiki != '' ) {
 554                         // This probably shouldn't even happen. ohh man, oh yuck.
 555                         // But for interwiki transclusion it sometimes does.
 556                         // Shit. Shit shit shit.
 557                         //
 558                         // Use the canonical namespaces if possible to try to
 559                         // resolve a foreign namespace.
 560                         if( MWNamespace::exists( $this->mNamespace ) ) {
 561                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 562                         }
 563                 }
 564                 return $wgContLang->getNsText( $this->mNamespace );
 565         }
 566         /**
 567          * Get the DB key with the initial letter case as specified by the user
 568          * @return \type{\string} DB key
 569          */
 570         function getUserCaseDBKey() {
 571                 return $this->mUserCaseDBKey;
 572         }
 573         /**
 574          * Get the namespace text of the subject (rather than talk) page
 575          * @return \type{\string} Namespace text
 576          */
 577         public function getSubjectNsText() {
 578                 global $wgContLang;
 579                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 580         }
 581         /**
 582          * Get the namespace text of the talk page
 583          * @return \type{\string} Namespace text
 584          */
 585         public function getTalkNsText() {
 586                 global $wgContLang;
 587                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 588         }
 589         /**
 590          * Could this title have a corresponding talk page?
 591          * @return \type{\bool} TRUE or FALSE
 592          */
 593         public function canTalk() {
 594                 return( MWNamespace::canTalk( $this->mNamespace ) );
 595         }
 596         /**
 597          * Get the interwiki prefix (or null string)
 598          * @return \type{\string} Interwiki prefix
 599          */
 600         public function getInterwiki() { return $this->mInterwiki; }
 601         /**
 602          * Get the Title fragment (i.e.\ the bit after the #) in text form
 603          * @return \type{\string} Title fragment
 604          */
 605         public function getFragment() { return $this->mFragment; }
 606         /**
 607          * Get the fragment in URL form, including the "#" character if there is one
 608          * @return \type{\string} Fragment in URL form
 609          */
 610         public function getFragmentForURL() {
 611                 if ( $this->mFragment == '' ) {
 612                         return '';
 613                 } else {
 614                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 615                 }
 616         }
 617         /**
 618          * Get the default namespace index, for when there is no namespace
 619          * @return \type{\int} Default namespace index
 620          */
 621         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 622
 623         /**
 624          * Get title for search index
 625          * @return \type{\string} a stripped-down title string ready for the
 626          *  search index
 627          */
 628         public function getIndexTitle() {
 629                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 630         }
 631
 632         /**
 633          * Get the prefixed database key form
 634          * @return \type{\string} the prefixed title, with underscores and
 635          *  any interwiki and namespace prefixes
 636          */
 637         public function getPrefixedDBkey() {
 638                 $s = $this->prefix( $this->mDbkeyform );
 639                 $s = str_replace( ' ', '_', $s );
 640                 return $s;
 641         }
 642
 643         /**
 644          * Get the prefixed title with spaces.
 645          * This is the form usually used for display
 646          * @return \type{\string} the prefixed title, with spaces
 647          */
 648         public function getPrefixedText() {
 649                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 650                         $s = $this->prefix( $this->mTextform );
 651                         $s = str_replace( '_', ' ', $s );
 652                         $this->mPrefixedText = $s;
 653                 }
 654                 return $this->mPrefixedText;
 655         }
 656
 657         /**
 658          * Get the prefixed title with spaces, plus any fragment
 659          * (part beginning with '#')
 660          * @return \type{\string} the prefixed title, with spaces and
 661          *  the fragment, including '#'
 662          */
 663         public function getFullText() {
 664                 $text = $this->getPrefixedText();
 665                 if( $this->mFragment != '' ) {
 666                         $text .= '#' . $this->mFragment;
 667                 }
 668                 return $text;
 669         }
 670
 671         /**
 672          * Get the base name, i.e. the leftmost parts before the /
 673          * @return \type{\string} Base name
 674          */
 675         public function getBaseText() {
 676                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 677                         return $this->getText();
 678                 }
 679
 680                 $parts = explode( '/', $this->getText() );
 681                 # Don't discard the real title if there's no subpage involved
 682                 if( count( $parts ) > 1 )
 683                         unset( $parts[ count( $parts ) - 1 ] );
 684                 return implode( '/', $parts );
 685         }
 686
 687         /**
 688          * Get the lowest-level subpage name, i.e. the rightmost part after /
 689          * @return \type{\string} Subpage name
 690          */
 691         public function getSubpageText() {
 692                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
 693                         return( $this->mTextform );
 694                 }
 695                 $parts = explode( '/', $this->mTextform );
 696                 return( $parts[ count( $parts ) - 1 ] );
 697         }
 698
 699         /**
 700          * Get a URL-encoded form of the subpage text
 701          * @return \type{\string} URL-encoded subpage name
 702          */
 703         public function getSubpageUrlForm() {
 704                 $text = $this->getSubpageText();
 705                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 706                 return( $text );
 707         }
 708
 709         /**
 710          * Get a URL-encoded title (not an actual URL) including interwiki
 711          * @return \type{\string} the URL-encoded form
 712          */
 713         public function getPrefixedURL() {
 714                 $s = $this->prefix( $this->mDbkeyform );
 715                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
 716                 return $s;
 717         }
 718
 719         /**
 720          * Get a real URL referring to this title, with interwiki link and
 721          * fragment
 722          *
 723          * @param $query \twotypes{\string,\array} an optional query string, not used for interwiki
 724          *   links. Can be specified as an associative array as well, e.g.,
 725          *   array( 'action' => 'edit' ) (keys and values will be URL-escaped).
 726          * @param $variant \type{\string} language variant of url (for sr, zh..)
 727          * @return \type{\string} the URL
 728          */
 729         public function getFullURL( $query = '', $variant = false ) {
 730                 global $wgContLang, $wgServer, $wgRequest;
 731
 732                 if( is_array( $query ) ) {
 733                         $query = wfArrayToCGI( $query );
 734                 }
 735
 736                 $interwiki = Interwiki::fetch( $this->mInterwiki );
 737                 if ( !$interwiki ) {
 738                         $url = $this->getLocalURL( $query, $variant );
 739
 740                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 741                         // Correct fix would be to move the prepending elsewhere.
 742                         if ($wgRequest->getVal('action') != 'render') {
 743                                 $url = $wgServer . $url;
 744                         }
 745                 } else {
 746                         $baseUrl = $interwiki->getURL( );
 747
 748                         $namespace = wfUrlencode( $this->getNsText() );
 749                         if ( $namespace != '' ) {
 750                                 # Can this actually happen? Interwikis shouldn't be parsed.
 751                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 752                                 $namespace .= ':';
 753                         }
 754                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 755                         $url = wfAppendQuery( $url, $query );
 756                 }
 757
 758                 # Finally, add the fragment.
 759                 $url .= $this->getFragmentForURL();
 760
 761                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 762                 return $url;
 763         }
 764
 765         /**
 766          * Get a URL with no fragment or server name.  If this page is generated
 767          * with action=render, $wgServer is prepended.
 768          * @param mixed $query an optional query string; if not specified,
 769          *   $wgArticlePath will be used.  Can be specified as an associative array
 770          *   as well, e.g., array( 'action' => 'edit' ) (keys and values will be
 771          *   URL-escaped).
 772          * @param $variant \type{\string} language variant of url (for sr, zh..)
 773          * @return \type{\string} the URL
 774          */
 775         public function getLocalURL( $query = '', $variant = false ) {
 776                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 777                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 778
 779                 if( is_array( $query ) ) {
 780                         $query = wfArrayToCGI( $query );
 781                 }
 782
 783                 // internal links should point to same variant as current page (only anonymous users)
 784                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 785                         $pref = $wgContLang->getPreferredVariant(false);
 786                         if($pref != $wgContLang->getCode())
 787                                 $variant = $pref;
 788                 }
 789
 790                 if ( $this->isExternal() ) {
 791                         $url = $this->getFullURL();
 792                         if ( $query ) {
 793                                 // This is currently only used for edit section links in the
 794                                 // context of interwiki transclusion. In theory we should
 795                                 // append the query to the end of any existing query string,
 796                                 // but interwiki transclusion is already broken in that case.
 797                                 $url .= "?$query";
 798                         }
 799                 } else {
 800                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 801                         if ( $query == '' ) {
 802                                 if( $variant != false && $wgContLang->hasVariants() ) {
 803                                         if( $wgVariantArticlePath == false ) {
 804                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 805                                         } else {
 806                                                 $variantArticlePath = $wgVariantArticlePath;
 807                                         }
 808                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 809                                         $url = str_replace( '$1', $dbkey, $url  );
 810                                 } else {
 811                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 812                                 }
 813                         } else {
 814                                 global $wgActionPaths;
 815                                 $url = false;
 816                                 $matches = array();
 817                                 if( !empty( $wgActionPaths ) &&
 818                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 819                                 {
 820                                         $action = urldecode( $matches[2] );
 821                                         if( isset( $wgActionPaths[$action] ) ) {
 822                                                 $query = $matches[1];
 823                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 824                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 825                                                 if( $query != '' ) {
 826                                                         $url = wfAppendQuery( $url, $query );
 827                                                 }
 828                                         }
 829                                 }
 830                                 if ( $url === false ) {
 831                                         if ( $query == '-' ) {
 832                                                 $query = '';
 833                                         }
 834                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 835                                 }
 836                         }
 837
 838                         // FIXME: this causes breakage in various places when we
 839                         // actually expected a local URL and end up with dupe prefixes.
 840                         if ($wgRequest->getVal('action') == 'render') {
 841                                 $url = $wgServer . $url;
 842                         }
 843                 }
 844                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 845                 return $url;
 846         }
 847
 848         /**
 849          * Get a URL that's the simplest URL that will be valid to link, locally,
 850          * to the current Title.  It includes the fragment, but does not include
 851          * the server unless action=render is used (or the link is external).  If
 852          * there's a fragment but the prefixed text is empty, we just return a link
 853          * to the fragment.
 854          *
 855          * The result obviously should not be URL-escaped, but does need to be
 856          * HTML-escaped if it's being output in HTML.
 857          *
 858          * @param $query \type{\arrayof{\string}} An associative array of key => value pairs for the
 859          *   query string.  Keys and values will be escaped.
 860          * @param $variant \type{\string} Language variant of URL (for sr, zh..).  Ignored
 861          *   for external links.  Default is "false" (same variant as current page,
 862          *   for anonymous users).
 863          * @return \type{\string} the URL
 864          */
 865         public function getLinkUrl( $query = array(), $variant = false ) {
 866                 wfProfileIn( __METHOD__ );
 867                 if( $this->isExternal() ) {
 868                         $ret = $this->getFullURL( $query );
 869                 } elseif( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
 870                         $ret = $this->getFragmentForURL();
 871                 } else {
 872                         $ret = $this->getLocalURL( $query, $variant ) . $this->getFragmentForURL();
 873                 }
 874                 wfProfileOut( __METHOD__ );
 875                 return $ret;
 876         }
 877
 878         /**
 879          * Get an HTML-escaped version of the URL form, suitable for
 880          * using in a link, without a server name or fragment
 881          * @param $query \type{\string} an optional query string
 882          * @return \type{\string} the URL
 883          */
 884         public function escapeLocalURL( $query = '' ) {
 885                 return htmlspecialchars( $this->getLocalURL( $query ) );
 886         }
 887
 888         /**
 889          * Get an HTML-escaped version of the URL form, suitable for
 890          * using in a link, including the server name and fragment
 891          *
 892          * @param $query \type{\string} an optional query string
 893          * @return \type{\string} the URL
 894          */
 895         public function escapeFullURL( $query = '' ) {
 896                 return htmlspecialchars( $this->getFullURL( $query ) );
 897         }
 898
 899         /**
 900          * Get the URL form for an internal link.
 901          * - Used in various Squid-related code, in case we have a different
 902          * internal hostname for the server from the exposed one.
 903          *
 904          * @param $query \type{\string} an optional query string
 905          * @param $variant \type{\string} language variant of url (for sr, zh..)
 906          * @return \type{\string} the URL
 907          */
 908         public function getInternalURL( $query = '', $variant = false ) {
 909                 global $wgInternalServer;
 910                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 911                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 912                 return $url;
 913         }
 914
 915         /**
 916          * Get the edit URL for this Title
 917          * @return \type{\string} the URL, or a null string if this is an
 918          *  interwiki link
 919          */
 920         public function getEditURL() {
 921                 if ( $this->mInterwiki != '' ) { return ''; }
 922                 $s = $this->getLocalURL( 'action=edit' );
 923
 924                 return $s;
 925         }
 926
 927         /**
 928          * Get the HTML-escaped displayable text form.
 929          * Used for the title field in <a> tags.
 930          * @return \type{\string} the text, including any prefixes
 931          */
 932         public function getEscapedText() {
 933                 return htmlspecialchars( $this->getPrefixedText() );
 934         }
 935
 936         /**
 937          * Is this Title interwiki?
 938          * @return \type{\bool}
 939          */
 940         public function isExternal() { return ( $this->mInterwiki != '' ); }
 941
 942         /**
 943          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 944          *
 945          * @param $action \type{\string} Action to check (default: edit)
 946          * @return \type{\bool}
 947          */
 948         public function isSemiProtected( $action = 'edit' ) {
 949                 if( $this->exists() ) {
 950                         $restrictions = $this->getRestrictions( $action );
 951                         if( count( $restrictions ) > 0 ) {
 952                                 foreach( $restrictions as $restriction ) {
 953                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 954                                                 return false;
 955                                 }
 956                         } else {
 957                                 # Not protected
 958                                 return false;
 959                         }
 960                         return true;
 961                 } else {
 962                         # If it doesn't exist, it can't be protected
 963                         return false;
 964                 }
 965         }
 966
 967         /**
 968          * Does the title correspond to a protected article?
 969          * @param $action \type{\string} the action the page is protected from,
 970          * by default checks all actions.
 971          * @return \type{\bool}
 972          */
 973         public function isProtected( $action = '' ) {
 974                 global $wgRestrictionLevels;
 975
 976                 $restrictionTypes = $this->getRestrictionTypes();
 977
 978                 # Special pages have inherent protection
 979                 if( $this->getNamespace() == NS_SPECIAL )
 980                         return true;
 981
 982                 # Check regular protection levels
 983                 foreach( $restrictionTypes as $type ){
 984                         if( $action == $type || $action == '' ) {
 985                                 $r = $this->getRestrictions( $type );
 986                                 foreach( $wgRestrictionLevels as $level ) {
 987                                         if( in_array( $level, $r ) && $level != '' ) {
 988                                                 return true;
 989                                         }
 990                                 }
 991                         }
 992                 }
 993
 994                 return false;
 995         }
 996
 997         /**
 998          * Is this a conversion table for the LanguageConverter?
 999          * @return \type{\bool}
1000          */
1001         public function isConversionTable() {
1002                 if($this->getNamespace() == NS_MEDIAWIKI
1003                    && strpos( $this->getText(), 'Conversiontable' ) !== false ) {
1004                         return true;
1005                 }
1006
1007                 return false;
1008         }
1009
1010         /**
1011          * Is $wgUser watching this page?
1012          * @return \type{\bool}
1013          */
1014         public function userIsWatching() {
1015                 global $wgUser;
1016
1017                 if ( is_null( $this->mWatched ) ) {
1018                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
1019                                 $this->mWatched = false;
1020                         } else {
1021                                 $this->mWatched = $wgUser->isWatched( $this );
1022                         }
1023                 }
1024                 return $this->mWatched;
1025         }
1026
1027         /**
1028          * Can $wgUser perform $action on this page?
1029          * This skips potentially expensive cascading permission checks
1030          * as well as avoids expensive error formatting
1031          *
1032          * Suitable for use for nonessential UI controls in common cases, but
1033          * _not_ for functional access control.
1034          *
1035          * May provide false positives, but should never provide a false negative.
1036          *
1037          * @param $action \type{\string} action that permission needs to be checked for
1038          * @return \type{\bool}
1039          */
1040         public function quickUserCan( $action ) {
1041                 return $this->userCan( $action, false );
1042         }
1043
1044         /**
1045          * Determines if $wgUser is unable to edit this page because it has been protected
1046          * by $wgNamespaceProtection.
1047          *
1048          * @return \type{\bool}
1049          */
1050         public function isNamespaceProtected() {
1051                 global $wgNamespaceProtection, $wgUser;
1052                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1053                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1054                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1055                                         return true;
1056                         }
1057                 }
1058                 return false;
1059         }
1060
1061         /**
1062          * Can $wgUser perform $action on this page?
1063          * @param $action \type{\string} action that permission needs to be checked for
1064          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1065          * @return \type{\bool}
1066          */
1067         public function userCan( $action, $doExpensiveQueries = true ) {
1068                 global $wgUser;
1069                 return ($this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries, true ) === array());
1070         }
1071
1072         /**
1073          * Can $user perform $action on this page?
1074          *
1075          * FIXME: This *does not* check throttles (User::pingLimiter()).
1076          *
1077          * @param $action \type{\string}action that permission needs to be checked for
1078          * @param $user \type{User} user to check
1079          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1080          * @param $ignoreErrors \type{\arrayof{\string}} Set this to a list of message keys whose corresponding errors may be ignored.
1081          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1082          */
1083         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1084                 if( !StubObject::isRealObject( $user ) ) {
1085                         //Since StubObject is always used on globals, we can unstub $wgUser here and set $user = $wgUser
1086                         global $wgUser;
1087                         $wgUser->_unstub( '', 5 );
1088                         $user = $wgUser;
1089                 }
1090                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1091
1092                 global $wgContLang;
1093                 global $wgLang;
1094                 global $wgEmailConfirmToEdit;
1095
1096                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() && $action != 'createaccount' ) {
1097                         $errors[] = array( 'confirmedittext' );
1098                 }
1099
1100                 // Edit blocks should not affect reading. Account creation blocks handled at userlogin.
1101                 if ( $action != 'read' && $action != 'createaccount' && $user->isBlockedFrom( $this ) ) {
1102                         $block = $user->mBlock;
1103
1104                         // This is from OutputPage::blockedPage
1105                         // Copied at r23888 by werdna
1106
1107                         $id = $user->blockedBy();
1108                         $reason = $user->blockedFor();
1109                         if( $reason == '' ) {
1110                                 $reason = wfMsg( 'blockednoreason' );
1111                         }
1112                         $ip = wfGetIP();
1113
1114                         if ( is_numeric( $id ) ) {
1115                                 $name = User::whoIs( $id );
1116                         } else {
1117                                 $name = $id;
1118                         }
1119
1120                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1121                         $blockid = $block->mId;
1122                         $blockExpiry = $user->mBlock->mExpiry;
1123                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $user->mBlock->mTimestamp ), true );
1124
1125                         if ( $blockExpiry == 'infinity' ) {
1126                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1127                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1128
1129                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1130                                         if ( strpos( $option, ':' ) == false )
1131                                                 continue;
1132
1133                                         list ($show, $value) = explode( ":", $option );
1134
1135                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1136                                                 $blockExpiry = $show;
1137                                                 break;
1138                                         }
1139                                 }
1140                         } else {
1141                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1142                         }
1143
1144                         $intended = $user->mBlock->mAddress;
1145
1146                         $errors[] = array( ($block->mAuto ? 'autoblockedtext' : 'blockedtext'), $link, $reason, $ip, $name,
1147                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1148                 }
1149
1150                 // Remove the errors being ignored.
1151
1152                 foreach( $errors as $index => $error ) {
1153                         $error_key = is_array($error) ? $error[0] : $error;
1154
1155                         if (in_array( $error_key, $ignoreErrors )) {
1156                                 unset($errors[$index]);
1157                         }
1158                 }
1159
1160                 return $errors;
1161         }
1162
1163         /**
1164          * Can $user perform $action on this page? This is an internal function,
1165          * which checks ONLY that previously checked by userCan (i.e. it leaves out
1166          * checks on wfReadOnly() and blocks)
1167          *
1168          * @param $action \type{\string} action that permission needs to be checked for
1169          * @param $user \type{User} user to check
1170          * @param $doExpensiveQueries \type{\bool} Set this to false to avoid doing unnecessary queries.
1171          * @param $short \type{\bool} Set this to true to stop after the first permission error.
1172          * @return \type{\array} Array of arrays of the arguments to wfMsg to explain permissions problems.
1173          */
1174         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries=true, $short=false ) {
1175                 wfProfileIn( __METHOD__ );
1176
1177                 $errors = array();
1178
1179                 // First stop is permissions checks, which fail most often, and which are easiest to test.
1180                 if ( $action == 'move' ) {
1181                         if( !$user->isAllowed( 'move-rootuserpages' )
1182                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1183                         {
1184                                 // Show user page-specific message only if the user can move other pages
1185                                 $errors[] = array( 'cant-move-user-page' );
1186                         }
1187
1188                         // Check if user is allowed to move files if it's a file
1189                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1190                                 $errors[] = array( 'movenotallowedfile' );
1191                         }
1192
1193                         if( !$user->isAllowed( 'move' ) ) {
1194                                 // User can't move anything
1195                                 global $wgGroupPermissions;
1196                                 $userCanMove = false;
1197                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1198                                         $userCanMove = $wgGroupPermissions['user']['move'];
1199                                 }
1200                                 $autoconfirmedCanMove = false;
1201                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1202                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1203                                 }
1204                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1205                                         // custom message if logged-in users without any special rights can move
1206                                         $errors[] = array ( 'movenologintext' );
1207                                 } else {
1208                                         $errors[] = array ('movenotallowed');
1209                                 }
1210                         }
1211                 } elseif ( $action == 'create' ) {
1212                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1213                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1214                         {
1215                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1216                         }
1217                 } elseif( $action == 'move-target' ) {
1218                         if( !$user->isAllowed( 'move' ) ) {
1219                                 // User can't move anything
1220                                 $errors[] = array ('movenotallowed');
1221                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1222                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1223                         {
1224                                 // Show user page-specific message only if the user can move other pages
1225                                 $errors[] = array( 'cant-move-to-user-page' );
1226                         }
1227                 } elseif( !$user->isAllowed( $action ) ) {
1228                         $return = null;
1229
1230                         // We avoid expensive display logic for quickUserCan's and such
1231                         $groups = false;
1232                         if (!$short) {
1233                                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1234                                         User::getGroupsWithPermission( $action ) );
1235                         }
1236
1237                         if( $groups ) {
1238                                 global $wgLang;
1239                                 $return = array(
1240                                         'badaccess-groups',
1241                                         $wgLang->commaList( $groups ),
1242                                         count( $groups )
1243                                 );
1244                         } else {
1245                                 $return = array( "badaccess-group0" );
1246                         }
1247                         $errors[] = $return;
1248                 }
1249
1250                 # Short-circuit point
1251                 if( $short && count($errors) > 0 ) {
1252                         wfProfileOut( __METHOD__ );
1253                         return $errors;
1254                 }
1255
1256                 // Use getUserPermissionsErrors instead
1257                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1258                         wfProfileOut( __METHOD__ );
1259                         return $result ? array() : array( array( 'badaccess-group0' ) );
1260                 }
1261                 // Check getUserPermissionsErrors hook
1262                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1263                         if( is_array($result) && count($result) && !is_array($result[0]) )
1264                                 $errors[] = $result; # A single array representing an error
1265                         else if( is_array($result) && is_array($result[0]) )
1266                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1267                         else if( $result !== '' && is_string($result) )
1268                                 $errors[] = array($result); # A string representing a message-id
1269                         else if( $result === false )
1270                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1271                 }
1272                 # Short-circuit point
1273                 if( $short && count($errors) > 0 ) {
1274                         wfProfileOut( __METHOD__ );
1275                         return $errors;
1276                 }
1277                 // Check getUserPermissionsErrorsExpensive hook
1278                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1279                         if( is_array($result) && count($result) && !is_array($result[0]) )
1280                                 $errors[] = $result; # A single array representing an error
1281                         else if( is_array($result) && is_array($result[0]) )
1282                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1283                         else if( $result !== '' && is_string($result) )
1284                                 $errors[] = array($result); # A string representing a message-id
1285                         else if( $result === false )
1286                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1287                 }
1288                 # Short-circuit point
1289                 if( $short && count($errors) > 0 ) {
1290                         wfProfileOut( __METHOD__ );
1291                         return $errors;
1292                 }
1293
1294                 # Only 'createaccount' and 'execute' can be performed on
1295                 # special pages, which don't actually exist in the DB.
1296                 $specialOKActions = array( 'createaccount', 'execute' );
1297                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1298                         $errors[] = array('ns-specialprotected');
1299                 }
1300
1301                 # Check $wgNamespaceProtection for restricted namespaces
1302                 if( $this->isNamespaceProtected() ) {
1303                         $ns = $this->getNamespace() == NS_MAIN ?
1304                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1305                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1306                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1307                 }
1308
1309                 # Protect css/js subpages of user pages
1310                 # XXX: this might be better using restrictions
1311                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssSubpage()
1312                 #      and $this->userCanEditJsSubpage() from working
1313                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1314                 if( $this->isCssSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('editusercss') )
1315                         && $action != 'patrol'
1316                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1317                 {
1318                         $errors[] = array('customcssjsprotected');
1319                 } else if( $this->isJsSubpage() && !( $user->isAllowed('editusercssjs') || $user->isAllowed('edituserjs') )
1320                         && $action != 'patrol'
1321                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1322                 {
1323                         $errors[] = array('customcssjsprotected');
1324                 }
1325
1326                 # Check against page_restrictions table requirements on this
1327                 # page. The user must possess all required rights for this action.
1328                 foreach( $this->getRestrictions($action) as $right ) {
1329                         // Backwards compatibility, rewrite sysop -> protect
1330                         if( $right == 'sysop' ) {
1331                                 $right = 'protect';
1332                         }
1333                         if( $right != '' && !$user->isAllowed( $right ) ) {
1334                                 // Users with 'editprotected' permission can edit protected pages
1335                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1336                                         // Users with 'editprotected' permission cannot edit protected pages
1337                                         // with cascading option turned on.
1338                                         if( $this->mCascadeRestriction ) {
1339                                                 $errors[] = array( 'protectedpagetext', $right );
1340                                         }
1341                                 } else {
1342                                         $errors[] = array( 'protectedpagetext', $right );
1343                                 }
1344                         }
1345                 }
1346                 # Short-circuit point
1347                 if( $short && count($errors) > 0 ) {
1348                         wfProfileOut( __METHOD__ );
1349                         return $errors;
1350                 }
1351
1352                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1353                         # We /could/ use the protection level on the source page, but it's fairly ugly
1354                         #  as we have to establish a precedence hierarchy for pages included by multiple
1355                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1356                         #  as they could remove the protection anyway.
1357                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1358                         # Cascading protection depends on more than this page...
1359                         # Several cascading protected pages may include this page...
1360                         # Check each cascading level
1361                         # This is only for protection restrictions, not for all actions
1362                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1363                                 foreach( $restrictions[$action] as $right ) {
1364                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1365                                         if( $right != '' && !$user->isAllowed( $right ) ) {
1366                                                 $pages = '';
1367                                                 foreach( $cascadingSources as $page )
1368                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1369                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1370                                         }
1371                                 }
1372                         }
1373                 }
1374                 # Short-circuit point
1375                 if( $short && count($errors) > 0 ) {
1376                         wfProfileOut( __METHOD__ );
1377                         return $errors;
1378                 }
1379
1380                 if( $action == 'protect' ) {
1381                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1382                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1383                         }
1384                 }
1385
1386                 if( $action == 'create' ) {
1387                         $title_protection = $this->getTitleProtection();
1388                         if( is_array($title_protection) ) {
1389                                 extract($title_protection); // is this extract() really needed?
1390
1391                                 if( $pt_create_perm == 'sysop' ) {
1392                                         $pt_create_perm = 'protect'; // B/C
1393                                 }
1394                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1395                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1396                                 }
1397                         }
1398                 } elseif( $action == 'move' ) {
1399                         // Check for immobile pages
1400                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1401                                 // Specific message for this case
1402                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1403                         } elseif( !$this->isMovable() ) {
1404                                 // Less specific message for rarer cases
1405                                 $errors[] = array( 'immobile-page' );
1406                         }
1407                 } elseif( $action == 'move-target' ) {
1408                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1409                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1410                         } elseif( !$this->isMovable() ) {
1411                                 $errors[] = array( 'immobile-target-page' );
1412                         }
1413                 }
1414
1415                 wfProfileOut( __METHOD__ );
1416                 return $errors;
1417         }
1418
1419         /**
1420          * Is this title subject to title protection?
1421          * @return \type{\mixed} An associative array representing any existent title
1422          *   protection, or false if there's none.
1423          */
1424         private function getTitleProtection() {
1425                 // Can't protect pages in special namespaces
1426                 if ( $this->getNamespace() < 0 ) {
1427                         return false;
1428                 }
1429
1430                 // Can't protect pages that exist.
1431                 if ($this->exists()) {
1432                         return false;
1433                 }
1434
1435                 $dbr = wfGetDB( DB_SLAVE );
1436                 $res = $dbr->select( 'protected_titles', '*',
1437                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1438                         __METHOD__ );
1439
1440                 if ($row = $dbr->fetchRow( $res )) {
1441                         return $row;
1442                 } else {
1443                         return false;
1444                 }
1445         }
1446
1447         /**
1448          * Update the title protection status
1449          * @param $create_perm \type{\string} Permission required for creation
1450          * @param $reason \type{\string} Reason for protection
1451          * @param $expiry \type{\string} Expiry timestamp
1452          * @return boolean true
1453          */
1454         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1455                 global $wgUser,$wgContLang;
1456
1457                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1458                         && $expiry == $this->mRestrictionsExpiry['create']) {
1459                         // No change
1460                         return true;
1461                 }
1462
1463                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1464
1465                 $dbw = wfGetDB( DB_MASTER );
1466
1467                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1468
1469                 $expiry_description = '';
1470                 if ( $encodedExpiry != 'infinity' ) {
1471                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring',$wgContLang->timeanddate( $expiry ),
1472                                 $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1473                 }
1474                 else {
1475                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1476                 }
1477
1478                 # Update protection table
1479                 if ($create_perm != '' ) {
1480                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1481                                 array(
1482                                         'pt_namespace' => $namespace,
1483                                         'pt_title' => $title,
1484                                         'pt_create_perm' => $create_perm,
1485                                         'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw),
1486                                         'pt_expiry' => $encodedExpiry,
1487                                         'pt_user' => $wgUser->getId(),
1488                                         'pt_reason' => $reason,
1489                                 ), __METHOD__
1490                         );
1491                 } else {
1492                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1493                                 'pt_title' => $title ), __METHOD__ );
1494                 }
1495                 # Update the protection log
1496                 if( $dbw->affectedRows() ) {
1497                         $log = new LogPage( 'protect' );
1498
1499                         if( $create_perm ) {
1500                                 $params = array("[create=$create_perm] $expiry_description",'');
1501                                 $log->addEntry( ( isset( $this->mRestrictions['create'] ) && $this->mRestrictions['create'] ) ? 'modify' : 'protect', $this, trim( $reason ), $params );
1502                         } else {
1503                                 $log->addEntry( 'unprotect', $this, $reason );
1504                         }
1505                 }
1506
1507                 return true;
1508         }
1509
1510         /**
1511          * Remove any title protection due to page existing
1512          */
1513         public function deleteTitleProtection() {
1514                 $dbw = wfGetDB( DB_MASTER );
1515
1516                 $dbw->delete( 'protected_titles',
1517                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1518                         __METHOD__ );
1519         }
1520
1521         /**
1522          * Would anybody with sufficient privileges be able to move this page?
1523          * Some pages just aren't movable.
1524          *
1525          * @return \type{\bool} TRUE or FALSE
1526          */
1527         public function isMovable() {
1528                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1529         }
1530
1531         /**
1532          * Can $wgUser read this page?
1533          * @return \type{\bool} TRUE or FALSE
1534          * @todo fold these checks into userCan()
1535          */
1536         public function userCanRead() {
1537                 global $wgUser, $wgGroupPermissions;
1538
1539                 static $useShortcut = null;
1540
1541                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1542                 if( is_null( $useShortcut ) ) {
1543                         global $wgRevokePermissions;
1544                         $useShortcut = true;
1545                         if( empty( $wgGroupPermissions['*']['read'] ) ) {
1546                                 # Not a public wiki, so no shortcut
1547                                 $useShortcut = false;
1548                         } elseif( !empty( $wgRevokePermissions ) ) {
1549                                 /*
1550                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1551                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1552                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1553                                  * reading is allowed.
1554                                  */
1555                                 foreach( $wgRevokePermissions as $perms ) {
1556                                         if( !empty( $perms['read'] ) ) {
1557                                                 # We might be removing the read right from the user, so no shortcut
1558                                                 $useShortcut = false;
1559                                                 break;
1560                                         }
1561                                 }
1562                         }
1563                 }
1564
1565                 $result = null;
1566                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1567                 if ( $result !== null ) {
1568                         return $result;
1569                 }
1570
1571                 # Shortcut for public wikis, allows skipping quite a bit of code
1572                 if ( $useShortcut )
1573                         return true;
1574
1575                 if( $wgUser->isAllowed( 'read' ) ) {
1576                         return true;
1577                 } else {
1578                         global $wgWhitelistRead;
1579
1580                         /**
1581                          * Always grant access to the login page.
1582                          * Even anons need to be able to log in.
1583                         */
1584                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1585                                 return true;
1586                         }
1587
1588                         /**
1589                          * Bail out if there isn't whitelist
1590                          */
1591                         if( !is_array($wgWhitelistRead) ) {
1592                                 return false;
1593                         }
1594
1595                         /**
1596                          * Check for explicit whitelisting
1597                          */
1598                         $name = $this->getPrefixedText();
1599                         $dbName = $this->getPrefixedDBKey();
1600                         // Check with and without underscores
1601                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1602                                 return true;
1603
1604                         /**
1605                          * Old settings might have the title prefixed with
1606                          * a colon for main-namespace pages
1607                          */
1608                         if( $this->getNamespace() == NS_MAIN ) {
1609                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1610                                         return true;
1611                         }
1612
1613                         /**
1614                          * If it's a special page, ditch the subpage bit
1615                          * and check again
1616                          */
1617                         if( $this->getNamespace() == NS_SPECIAL ) {
1618                                 $name = $this->getDBkey();
1619                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1620                                 if ( $name === false ) {
1621                                         # Invalid special page, but we show standard login required message
1622                                         return false;
1623                                 }
1624
1625                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1626                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1627                                         return true;
1628                         }
1629
1630                 }
1631                 return false;
1632         }
1633
1634         /**
1635          * Is this a talk page of some sort?
1636          * @return \type{\bool} TRUE or FALSE
1637          */
1638         public function isTalkPage() {
1639                 return MWNamespace::isTalk( $this->getNamespace() );
1640         }
1641
1642         /**
1643          * Is this a subpage?
1644          * @return \type{\bool} TRUE or FALSE
1645          */
1646         public function isSubpage() {
1647                 return MWNamespace::hasSubpages( $this->mNamespace )
1648                         ? strpos( $this->getText(), '/' ) !== false
1649                         : false;
1650         }
1651
1652         /**
1653          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1654          * @return \type{\bool} TRUE or FALSE
1655          */
1656         public function hasSubpages() {
1657                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1658                         # Duh
1659                         return false;
1660                 }
1661
1662                 # We dynamically add a member variable for the purpose of this method
1663                 # alone to cache the result.  There's no point in having it hanging
1664                 # around uninitialized in every Title object; therefore we only add it
1665                 # if needed and don't declare it statically.
1666                 if( isset( $this->mHasSubpages ) ) {
1667                         return $this->mHasSubpages;
1668                 }
1669
1670                 $subpages = $this->getSubpages( 1 );
1671                 if( $subpages instanceof TitleArray )
1672                         return $this->mHasSubpages = (bool)$subpages->count();
1673                 return $this->mHasSubpages = false;
1674         }
1675
1676         /**
1677          * Get all subpages of this page.
1678          * @param $limit Maximum number of subpages to fetch; -1 for no limit
1679          * @return mixed TitleArray, or empty array if this page's namespace
1680          *  doesn't allow subpages
1681          */
1682         public function getSubpages( $limit = -1 ) {
1683                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
1684                         return array();
1685
1686                 $dbr = wfGetDB( DB_SLAVE );
1687                 $conds['page_namespace'] = $this->getNamespace();
1688                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
1689                 $options = array();
1690                 if( $limit > -1 )
1691                         $options['LIMIT'] = $limit;
1692                 return $this->mSubpages = TitleArray::newFromResult(
1693                         $dbr->select( 'page',
1694                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
1695                                 $conds,
1696                                 __METHOD__,
1697                                 $options
1698                         )
1699                 );
1700         }
1701
1702         /**
1703          * Could this page contain custom CSS or JavaScript, based
1704          * on the title?
1705          *
1706          * @return \type{\bool} TRUE or FALSE
1707          */
1708         public function isCssOrJsPage() {
1709                 return $this->mNamespace == NS_MEDIAWIKI
1710                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1711         }
1712
1713         /**
1714          * Is this a .css or .js subpage of a user page?
1715          * @return \type{\bool} TRUE or FALSE
1716          */
1717         public function isCssJsSubpage() {
1718                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1719         }
1720         /**
1721          * Is this a *valid* .css or .js subpage of a user page?
1722          * Check that the corresponding skin exists
1723          * @return \type{\bool} TRUE or FALSE
1724          */
1725         public function isValidCssJsSubpage() {
1726                 if ( $this->isCssJsSubpage() ) {
1727                         $name = $this->getSkinFromCssJsSubpage();
1728                         if ( $name == 'common' ) return true;
1729                         $skinNames = Skin::getSkinNames();
1730                         return array_key_exists( $name, $skinNames );
1731                 } else {
1732                         return false;
1733                 }
1734         }
1735         /**
1736          * Trim down a .css or .js subpage title to get the corresponding skin name
1737          * @return string containing skin name from .css or .js subpage title
1738          */
1739         public function getSkinFromCssJsSubpage() {
1740                 $subpage = explode( '/', $this->mTextform );
1741                 $subpage = $subpage[ count( $subpage ) - 1 ];
1742                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1743         }
1744         /**
1745          * Is this a .css subpage of a user page?
1746          * @return \type{\bool} TRUE or FALSE
1747          */
1748         public function isCssSubpage() {
1749                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1750         }
1751         /**
1752          * Is this a .js subpage of a user page?
1753          * @return \type{\bool} TRUE or FALSE
1754          */
1755         public function isJsSubpage() {
1756                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1757         }
1758         /**
1759          * Protect css subpages of user pages: can $wgUser edit
1760          * this page?
1761          *
1762          * @return \type{\bool} TRUE or FALSE
1763          * @todo XXX: this might be better using restrictions
1764          */
1765         public function userCanEditCssSubpage() {
1766                 global $wgUser;
1767                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('editusercss') )
1768                         || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1769         }
1770         /**
1771          * Protect js subpages of user pages: can $wgUser edit
1772          * this page?
1773          *
1774          * @return \type{\bool} TRUE or FALSE
1775          * @todo XXX: this might be better using restrictions
1776          */
1777         public function userCanEditJsSubpage() {
1778                 global $wgUser;
1779                 return ( ( $wgUser->isAllowed('editusercssjs') && $wgUser->isAllowed('edituserjs') )
1780                        || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1781         }
1782
1783         /**
1784          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1785          *
1786          * @return \type{\bool} If the page is subject to cascading restrictions.
1787          */
1788         public function isCascadeProtected() {
1789                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1790                 return ( $sources > 0 );
1791         }
1792
1793         /**
1794          * Cascading protection: Get the source of any cascading restrictions on this page.
1795          *
1796          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1797          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1798          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1799          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1800          */
1801         public function getCascadeProtectionSources( $get_pages = true ) {
1802                 $pagerestrictions = array();
1803
1804                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1805                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1806                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1807                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1808                 }
1809
1810                 wfProfileIn( __METHOD__ );
1811
1812                 $dbr = wfGetDB( DB_SLAVE );
1813
1814                 if ( $this->getNamespace() == NS_FILE ) {
1815                         $tables = array ('imagelinks', 'page_restrictions');
1816                         $where_clauses = array(
1817                                 'il_to' => $this->getDBkey(),
1818                                 'il_from=pr_page',
1819                                 'pr_cascade' => 1 );
1820                 } else {
1821                         $tables = array ('templatelinks', 'page_restrictions');
1822                         $where_clauses = array(
1823                                 'tl_namespace' => $this->getNamespace(),
1824                                 'tl_title' => $this->getDBkey(),
1825                                 'tl_from=pr_page',
1826                                 'pr_cascade' => 1 );
1827                 }
1828
1829                 if ( $get_pages ) {
1830                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1831                         $where_clauses[] = 'page_id=pr_page';
1832                         $tables[] = 'page';
1833                 } else {
1834                         $cols = array( 'pr_expiry' );
1835                 }
1836
1837                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1838
1839                 $sources = $get_pages ? array() : false;
1840                 $now = wfTimestampNow();
1841                 $purgeExpired = false;
1842
1843                 foreach( $res as $row ) {
1844                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1845                         if( $expiry > $now ) {
1846                                 if ($get_pages) {
1847                                         $page_id = $row->pr_page;
1848                                         $page_ns = $row->page_namespace;
1849                                         $page_title = $row->page_title;
1850                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1851                                         # Add groups needed for each restriction type if its not already there
1852                                         # Make sure this restriction type still exists
1853
1854                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
1855                                                 $pagerestrictions[$row->pr_type] = array();
1856                                         }
1857
1858                                         if ( isset($pagerestrictions[$row->pr_type]) &&
1859                                                         !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1860                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1861                                         }
1862                                 } else {
1863                                         $sources = true;
1864                                 }
1865                         } else {
1866                                 // Trigger lazy purge of expired restrictions from the db
1867                                 $purgeExpired = true;
1868                         }
1869                 }
1870                 if( $purgeExpired ) {
1871                         Title::purgeExpiredRestrictions();
1872                 }
1873
1874                 wfProfileOut( __METHOD__ );
1875
1876                 if ( $get_pages ) {
1877                         $this->mCascadeSources = $sources;
1878                         $this->mCascadingRestrictions = $pagerestrictions;
1879                 } else {
1880                         $this->mHasCascadingRestrictions = $sources;
1881                 }
1882                 return array( $sources, $pagerestrictions );
1883         }
1884
1885         /**
1886          * Returns cascading restrictions for the current article
1887          * @return
1888          */
1889         function areRestrictionsCascading() {
1890                 if (!$this->mRestrictionsLoaded) {
1891                         $this->loadRestrictions();
1892                 }
1893
1894                 return $this->mCascadeRestriction;
1895         }
1896
1897         /**
1898          * Loads a string into mRestrictions array
1899          * @param $res \type{Resource} restrictions as an SQL result.
1900          * @param $oldFashionedRestrictions string comma-separated list of page restrictions from page table (pre 1.10)
1901          */
1902         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
1903                 $rows = array();
1904                 $dbr = wfGetDB( DB_SLAVE );
1905
1906                 while( $row = $dbr->fetchObject( $res ) ) {
1907                         $rows[] = $row;
1908                 }
1909
1910                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
1911         }
1912
1913         /**
1914          * Compiles list of active page restrictions from both page table (pre 1.10) and page_restrictions table
1915          * @param $rows array of db result objects
1916          * @param $oldFashionedRestrictions string comma-separated list of page restrictions from page table (pre 1.10)
1917          */
1918         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
1919                 $dbr = wfGetDB( DB_SLAVE );
1920
1921                 $restrictionTypes = $this->getRestrictionTypes();
1922
1923                 foreach( $restrictionTypes as $type ){
1924                         $this->mRestrictions[$type] = array();
1925                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1926                 }
1927
1928                 $this->mCascadeRestriction = false;
1929
1930                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1931
1932                 if ( $oldFashionedRestrictions === null ) {
1933                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1934                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1935                 }
1936
1937                 if ($oldFashionedRestrictions != '') {
1938
1939                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1940                                 $temp = explode( '=', trim( $restrict ) );
1941                                 if(count($temp) == 1) {
1942                                         // old old format should be treated as edit/move restriction
1943                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1944                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1945                                 } else {
1946                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1947                                 }
1948                         }
1949
1950                         $this->mOldRestrictions = true;
1951
1952                 }
1953
1954                 if( count($rows) ) {
1955                         # Current system - load second to make them override.
1956                         $now = wfTimestampNow();
1957                         $purgeExpired = false;
1958
1959                         foreach( $rows as $row ) {
1960                                 # Cycle through all the restrictions.
1961
1962                                 // Don't take care of restrictions types that aren't allowed
1963
1964                                 if( !in_array( $row->pr_type, $restrictionTypes ) )
1965                                         continue;
1966
1967                                 // This code should be refactored, now that it's being used more generally,
1968                                 // But I don't really see any harm in leaving it in Block for now -werdna
1969                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1970
1971                                 // Only apply the restrictions if they haven't expired!
1972                                 if ( !$expiry || $expiry > $now ) {
1973                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1974                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1975
1976                                         $this->mCascadeRestriction |= $row->pr_cascade;
1977                                 } else {
1978                                         // Trigger a lazy purge of expired restrictions
1979                                         $purgeExpired = true;
1980                                 }
1981                         }
1982
1983                         if( $purgeExpired ) {
1984                                 Title::purgeExpiredRestrictions();
1985                         }
1986                 }
1987
1988                 $this->mRestrictionsLoaded = true;
1989         }
1990
1991         /**
1992          * Load restrictions from the page_restrictions table
1993          * @param $oldFashionedRestrictions string comma-separated list of page restrictions from page table (pre 1.10)
1994          */
1995         public function loadRestrictions( $oldFashionedRestrictions = null ) {
1996                 if( !$this->mRestrictionsLoaded ) {
1997                         if ($this->exists()) {
1998                                 $dbr = wfGetDB( DB_SLAVE );
1999
2000                                 $res = $dbr->select( 'page_restrictions', '*',
2001                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
2002
2003                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2004                         } else {
2005                                 $title_protection = $this->getTitleProtection();
2006
2007                                 if (is_array($title_protection)) {
2008                                         extract($title_protection);
2009
2010                                         $now = wfTimestampNow();
2011                                         $expiry = Block::decodeExpiry($pt_expiry);
2012
2013                                         if (!$expiry || $expiry > $now) {
2014                                                 // Apply the restrictions
2015                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2016                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
2017                                         } else { // Get rid of the old restrictions
2018                                                 Title::purgeExpiredRestrictions();
2019                                         }
2020                                 } else {
2021                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
2022                                 }
2023                                 $this->mRestrictionsLoaded = true;
2024                         }
2025                 }
2026         }
2027
2028         /**
2029          * Purge expired restrictions from the page_restrictions table
2030          */
2031         static function purgeExpiredRestrictions() {
2032                 $dbw = wfGetDB( DB_MASTER );
2033                 $dbw->delete( 'page_restrictions',
2034                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2035                         __METHOD__ );
2036
2037                 $dbw->delete( 'protected_titles',
2038                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2039                         __METHOD__ );
2040         }
2041
2042         /**
2043          * Accessor/initialisation for mRestrictions
2044          *
2045          * @param $action \type{\string} action that permission needs to be checked for
2046          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
2047          */
2048         public function getRestrictions( $action ) {
2049                 if( !$this->mRestrictionsLoaded ) {
2050                         $this->loadRestrictions();
2051                 }
2052                 return isset( $this->mRestrictions[$action] )
2053                                 ? $this->mRestrictions[$action]
2054                                 : array();
2055         }
2056
2057         /**
2058          * Get the expiry time for the restriction against a given action
2059          * @return 14-char timestamp, or 'infinity' if the page is protected forever
2060          *      or not protected at all, or false if the action is not recognised.
2061          */
2062         public function getRestrictionExpiry( $action ) {
2063                 if( !$this->mRestrictionsLoaded ) {
2064                         $this->loadRestrictions();
2065                 }
2066                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2067         }
2068
2069         /**
2070          * Is there a version of this page in the deletion archive?
2071          * @return \type{\int} the number of archived revisions
2072          */
2073         public function isDeleted() {
2074                 if( $this->getNamespace() < 0 ) {
2075                         $n = 0;
2076                 } else {
2077                         $dbr = wfGetDB( DB_SLAVE );
2078                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2079                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2080                                 __METHOD__
2081                         );
2082                         if( $this->getNamespace() == NS_FILE ) {
2083                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2084                                         array( 'fa_name' => $this->getDBkey() ),
2085                                         __METHOD__
2086                                 );
2087                         }
2088                 }
2089                 return (int)$n;
2090         }
2091
2092         /**
2093          * Is there a version of this page in the deletion archive?
2094          * @return bool
2095          */
2096         public function isDeletedQuick() {
2097                 if( $this->getNamespace() < 0 ) {
2098                         return false;
2099                 }
2100                 $dbr = wfGetDB( DB_SLAVE );
2101                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2102                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2103                         __METHOD__
2104                 );
2105                 if( !$deleted && $this->getNamespace() == NS_FILE ) {
2106                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2107                                 array( 'fa_name' => $this->getDBkey() ),
2108                                 __METHOD__
2109                         );
2110                 }
2111                 return $deleted;
2112         }
2113
2114         /**
2115          * Get the article ID for this Title from the link cache,
2116          * adding it if necessary
2117          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
2118          *  for update
2119          * @return \type{\int} the ID
2120          */
2121         public function getArticleID( $flags = 0 ) {
2122                 if( $this->getNamespace() < 0 ) {
2123                         return $this->mArticleID = 0;
2124                 }
2125                 $linkCache = LinkCache::singleton();
2126                 if( $flags & GAID_FOR_UPDATE ) {
2127                         $oldUpdate = $linkCache->forUpdate( true );
2128                         $linkCache->clearLink( $this );
2129                         $this->mArticleID = $linkCache->addLinkObj( $this );
2130                         $linkCache->forUpdate( $oldUpdate );
2131                 } else {
2132                         if( -1 == $this->mArticleID ) {
2133                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2134                         }
2135                 }
2136                 return $this->mArticleID;
2137         }
2138
2139         /**
2140          * Is this an article that is a redirect page?
2141          * Uses link cache, adding it if necessary
2142          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2143          * @return \type{\bool}
2144          */
2145         public function isRedirect( $flags = 0 ) {
2146                 if( !is_null($this->mRedirect) )
2147                         return $this->mRedirect;
2148                 # Calling getArticleID() loads the field from cache as needed
2149                 if( !$this->getArticleID($flags) ) {
2150                         return $this->mRedirect = false;
2151                 }
2152                 $linkCache = LinkCache::singleton();
2153                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2154
2155                 return $this->mRedirect;
2156         }
2157
2158         /**
2159          * What is the length of this page?
2160          * Uses link cache, adding it if necessary
2161          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2162          * @return \type{\bool}
2163          */
2164         public function getLength( $flags = 0 ) {
2165                 if( $this->mLength != -1 )
2166                         return $this->mLength;
2167                 # Calling getArticleID() loads the field from cache as needed
2168                 if( !$this->getArticleID($flags) ) {
2169                         return $this->mLength = 0;
2170                 }
2171                 $linkCache = LinkCache::singleton();
2172                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2173
2174                 return $this->mLength;
2175         }
2176
2177         /**
2178          * What is the page_latest field for this page?
2179          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2180          * @return \type{\int} or false if the page doesn't exist
2181          */
2182         public function getLatestRevID( $flags = 0 ) {
2183                 if( $this->mLatestID !== false )
2184                         return $this->mLatestID;
2185
2186                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2187                 $this->mLatestID = (int)$db->selectField(
2188                         'page', 'page_latest', $this->pageCond(), __METHOD__ );
2189                 return $this->mLatestID;
2190         }
2191
2192         /**
2193          * This clears some fields in this object, and clears any associated
2194          * keys in the "bad links" section of the link cache.
2195          *
2196          * - This is called from Article::insertNewArticle() to allow
2197          * loading of the new page_id. It's also called from
2198          * Article::doDeleteArticle()
2199          *
2200          * @param $newid \type{\int} the new Article ID
2201          */
2202         public function resetArticleID( $newid ) {
2203                 $linkCache = LinkCache::singleton();
2204                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2205
2206                 if ( $newid === false ) {
2207                         $this->mArticleID = -1;
2208                 } else {
2209                         $this->mArticleID = intval( $newid );
2210                 }
2211                 $this->mRestrictionsLoaded = false;
2212                 $this->mRestrictions = array();
2213                 $this->mRedirect = null;
2214                 $this->mLength = -1;
2215                 $this->mLatestID = false;
2216         }
2217
2218         /**
2219          * Updates page_touched for this page; called from LinksUpdate.php
2220          * @return \type{\bool} true if the update succeded
2221          */
2222         public function invalidateCache() {
2223                 if( wfReadOnly() ) {
2224                         return;
2225                 }
2226                 $dbw = wfGetDB( DB_MASTER );
2227                 $success = $dbw->update( 'page',
2228                         array( 'page_touched' => $dbw->timestamp() ),
2229                         $this->pageCond(),
2230                         __METHOD__
2231                 );
2232                 HTMLFileCache::clearFileCache( $this );
2233                 return $success;
2234         }
2235
2236         /**
2237          * Prefix some arbitrary text with the namespace or interwiki prefix
2238          * of this object
2239          *
2240          * @param $name \type{\string} the text
2241          * @return \type{\string} the prefixed text
2242          * @private
2243          */
2244         /* private */ function prefix( $name ) {
2245                 $p = '';
2246                 if ( $this->mInterwiki != '' ) {
2247                         $p = $this->mInterwiki . ':';
2248                 }
2249                 if ( 0 != $this->mNamespace ) {
2250                         $p .= $this->getNsText() . ':';
2251                 }
2252                 return $p . $name;
2253         }
2254
2255         /**
2256          * Returns a simple regex that will match on characters and sequences invalid in titles.
2257          * Note that this doesn't pick up many things that could be wrong with titles, but that
2258          * replacing this regex with something valid will make many titles valid.
2259          * @return string regex string
2260          */
2261         static function getTitleInvalidRegex() {
2262                 static $rxTc = false;
2263                 if( !$rxTc ) {
2264                         # Matching titles will be held as illegal.
2265                         $rxTc = '/' .
2266                                 # Any character not allowed is forbidden...
2267                                 '[^' . Title::legalChars() . ']' .
2268                                 # URL percent encoding sequences interfere with the ability
2269                                 # to round-trip titles -- you can't link to them consistently.
2270                                 '|%[0-9A-Fa-f]{2}' .
2271                                 # XML/HTML character references produce similar issues.
2272                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2273                                 '|&#[0-9]+;' .
2274                                 '|&#x[0-9A-Fa-f]+;' .
2275                                 '/S';
2276                 }
2277
2278                 return $rxTc;
2279         }
2280
2281         /**
2282          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
2283          * @param $text string containing title to capitalize
2284          * $param $ns int namespace index, defaults to NS_MAIN
2285          * @return $text string containing capitalized title
2286          */
2287         public static function capitalize( $text, $ns = NS_MAIN ) {
2288                 global $wgContLang;
2289
2290                 if ( MWNamespace::isCapitalized( $ns ) )
2291                         return $wgContLang->ucfirst( $text );
2292                 else
2293                         return $text;
2294         }
2295
2296         /**
2297          * Secure and split - main initialisation function for this object
2298          *
2299          * Assumes that mDbkeyform has been set, and is urldecoded
2300          * and uses underscores, but not otherwise munged.  This function
2301          * removes illegal characters, splits off the interwiki and
2302          * namespace prefixes, sets the other forms, and canonicalizes
2303          * everything.
2304          * @return \type{\bool} true on success
2305          */
2306         private function secureAndSplit() {
2307                 global $wgContLang, $wgLocalInterwiki;
2308
2309                 # Initialisation
2310                 $rxTc = self::getTitleInvalidRegex();
2311
2312                 $this->mInterwiki = $this->mFragment = '';
2313                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2314
2315                 $dbkey = $this->mDbkeyform;
2316
2317                 # Strip Unicode bidi override characters.
2318                 # Sometimes they slip into cut-n-pasted page titles, where the
2319                 # override chars get included in list displays.
2320                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2321
2322                 # Clean up whitespace
2323                 # Note: use of the /u option on preg_replace here will cause
2324                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2325                 # conveniently disabling them.
2326                 #
2327                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2328                 $dbkey = trim( $dbkey, '_' );
2329
2330                 if ( $dbkey == '' ) {
2331                         return false;
2332                 }
2333
2334                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2335                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2336                         return false;
2337                 }
2338
2339                 $this->mDbkeyform = $dbkey;
2340
2341                 # Initial colon indicates main namespace rather than specified default
2342                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2343                 if ( ':' == $dbkey{0} ) {
2344                         $this->mNamespace = NS_MAIN;
2345                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2346                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2347                 }
2348
2349                 # Namespace or interwiki prefix
2350                 $firstPass = true;
2351                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2352                 do {
2353                         $m = array();
2354                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2355                                 $p = $m[1];
2356                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2357                                         # Ordinary namespace
2358                                         $dbkey = $m[2];
2359                                         $this->mNamespace = $ns;
2360                                         # For Talk:X pages, check if X has a "namespace" prefix
2361                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2362                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2363                                                         return false; # Disallow Talk:File:x type titles...
2364                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2365                                                         return false; # Disallow Talk:Interwiki:x type titles...
2366                                         }
2367                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2368                                         if( !$firstPass ) {
2369                                                 # Can't make a local interwiki link to an interwiki link.
2370                                                 # That's just crazy!
2371                                                 return false;
2372                                         }
2373
2374                                         # Interwiki link
2375                                         $dbkey = $m[2];
2376                                         $this->mInterwiki = $wgContLang->lc( $p );
2377
2378                                         # Redundant interwiki prefix to the local wiki
2379                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2380                                                 if( $dbkey == '' ) {
2381                                                         # Can't have an empty self-link
2382                                                         return false;
2383                                                 }
2384                                                 $this->mInterwiki = '';
2385                                                 $firstPass = false;
2386                                                 # Do another namespace split...
2387                                                 continue;
2388                                         }
2389
2390                                         # If there's an initial colon after the interwiki, that also
2391                                         # resets the default namespace
2392                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2393                                                 $this->mNamespace = NS_MAIN;
2394                                                 $dbkey = substr( $dbkey, 1 );
2395                                         }
2396                                 }
2397                                 # If there's no recognized interwiki or namespace,
2398                                 # then let the colon expression be part of the title.
2399                         }
2400                         break;
2401                 } while( true );
2402
2403                 # We already know that some pages won't be in the database!
2404                 #
2405                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
2406                         $this->mArticleID = 0;
2407                 }
2408                 $fragment = strstr( $dbkey, '#' );
2409                 if ( false !== $fragment ) {
2410                         $this->setFragment( $fragment );
2411                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2412                         # remove whitespace again: prevents "Foo_bar_#"
2413                         # becoming "Foo_bar_"
2414                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2415                 }
2416
2417                 # Reject illegal characters.
2418                 #
2419                 if( preg_match( $rxTc, $dbkey ) ) {
2420                         return false;
2421                 }
2422
2423                 /**
2424                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2425                  * reachable due to the way web browsers deal with 'relative' URLs.
2426                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2427                  */
2428                 if ( strpos( $dbkey, '.' ) !== false &&
2429                      ( $dbkey === '.' || $dbkey === '..' ||
2430                        strpos( $dbkey, './' ) === 0  ||
2431                        strpos( $dbkey, '../' ) === 0 ||
2432                        strpos( $dbkey, '/./' ) !== false ||
2433                        strpos( $dbkey, '/../' ) !== false  ||
2434                        substr( $dbkey, -2 ) == '/.' ||
2435                        substr( $dbkey, -3 ) == '/..' ) )
2436                 {
2437                         return false;
2438                 }
2439
2440                 /**
2441                  * Magic tilde sequences? Nu-uh!
2442                  */
2443                 if( strpos( $dbkey, '~~~' ) !== false ) {
2444                         return false;
2445                 }
2446
2447                 /**
2448                  * Limit the size of titles to 255 bytes.
2449                  * This is typically the size of the underlying database field.
2450                  * We make an exception for special pages, which don't need to be stored
2451                  * in the database, and may edge over 255 bytes due to subpage syntax
2452                  * for long titles, e.g. [[Special:Block/Long name]]
2453                  */
2454                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2455                   strlen( $dbkey ) > 512 )
2456                 {
2457                         return false;
2458                 }
2459
2460                 /**
2461                  * Normally, all wiki links are forced to have
2462                  * an initial capital letter so [[foo]] and [[Foo]]
2463                  * point to the same place.
2464                  *
2465                  * Don't force it for interwikis, since the other
2466                  * site might be case-sensitive.
2467                  */
2468                 $this->mUserCaseDBKey = $dbkey;
2469                 if(  $this->mInterwiki == '') {
2470                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
2471                 }
2472
2473                 /**
2474                  * Can't make a link to a namespace alone...
2475                  * "empty" local links can only be self-links
2476                  * with a fragment identifier.
2477                  */
2478                 if( $dbkey == '' &&
2479                         $this->mInterwiki == '' &&
2480                         $this->mNamespace != NS_MAIN ) {
2481                         return false;
2482                 }
2483                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2484                 // IP names are not allowed for accounts, and can only be referring to
2485                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2486                 // there are numerous ways to present the same IP. Having sp:contribs scan
2487                 // them all is silly and having some show the edits and others not is
2488                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2489                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2490                         IP::sanitizeIP( $dbkey ) : $dbkey;
2491                 // Any remaining initial :s are illegal.
2492                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2493                         return false;
2494                 }
2495
2496                 # Fill fields
2497                 $this->mDbkeyform = $dbkey;
2498                 $this->mUrlform = wfUrlencode( $dbkey );
2499
2500                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2501
2502                 return true;
2503         }
2504
2505         /**
2506          * Set the fragment for this title. Removes the first character from the
2507          * specified fragment before setting, so it assumes you're passing it with
2508          * an initial "#".
2509          *
2510          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2511          * Still in active use privately.
2512          *
2513          * @param $fragment \type{\string} text
2514          */
2515         public function setFragment( $fragment ) {
2516                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2517         }
2518
2519         /**
2520          * Get a Title object associated with the talk page of this article
2521          * @return \type{Title} the object for the talk page
2522          */
2523         public function getTalkPage() {
2524                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2525         }
2526
2527         /**
2528          * Get a title object associated with the subject page of this
2529          * talk page
2530          *
2531          * @return \type{Title} the object for the subject page
2532          */
2533         public function getSubjectPage() {
2534                 // Is this the same title?
2535                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2536                 if( $this->getNamespace() == $subjectNS ) {
2537                         return $this;
2538                 }
2539                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2540         }
2541
2542         /**
2543          * Get an array of Title objects linking to this Title
2544          * Also stores the IDs in the link cache.
2545          *
2546          * WARNING: do not use this function on arbitrary user-supplied titles!
2547          * On heavily-used templates it will max out the memory.
2548          *
2549          * @param array $options may be FOR UPDATE
2550          * @return \type{\arrayof{Title}} the Title objects linking here
2551          */
2552         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
2553                 $linkCache = LinkCache::singleton();
2554
2555                 if ( count( $options ) > 0 ) {
2556                         $db = wfGetDB( DB_MASTER );
2557                 } else {
2558                         $db = wfGetDB( DB_SLAVE );
2559                 }
2560
2561                 $res = $db->select( array( 'page', $table ),
2562                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2563                         array(
2564                                 "{$prefix}_from=page_id",
2565                                 "{$prefix}_namespace" => $this->getNamespace(),
2566                                 "{$prefix}_title"     => $this->getDBkey() ),
2567                         __METHOD__,
2568                         $options );
2569
2570                 $retVal = array();
2571                 if ( $db->numRows( $res ) ) {
2572                         foreach( $res as $row ) {
2573                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2574                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2575                                         $retVal[] = $titleObj;
2576                                 }
2577                         }
2578                 }
2579                 $db->freeResult( $res );
2580                 return $retVal;
2581         }
2582
2583         /**
2584          * Get an array of Title objects using this Title as a template
2585          * Also stores the IDs in the link cache.
2586          *
2587          * WARNING: do not use this function on arbitrary user-supplied titles!
2588          * On heavily-used templates it will max out the memory.
2589          *
2590          * @param array $options may be FOR UPDATE
2591          * @return \type{\arrayof{Title}} the Title objects linking here
2592          */
2593         public function getTemplateLinksTo( $options = array() ) {
2594                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2595         }
2596
2597         /**
2598          * Get an array of Title objects referring to non-existent articles linked from this page
2599          *
2600          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2601          * @return \type{\arrayof{Title}} the Title objects
2602          */
2603         public function getBrokenLinksFrom() {
2604                 if ( $this->getArticleId() == 0 ) {
2605                         # All links from article ID 0 are false positives
2606                         return array();
2607                 }
2608
2609                 $dbr = wfGetDB( DB_SLAVE );
2610                 $res = $dbr->select(
2611                         array( 'page', 'pagelinks' ),
2612                         array( 'pl_namespace', 'pl_title' ),
2613                         array(
2614                                 'pl_from' => $this->getArticleId(),
2615                                 'page_namespace IS NULL'
2616                         ),
2617                         __METHOD__, array(),
2618                         array(
2619                                 'page' => array(
2620                                         'LEFT JOIN',
2621                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
2622                                 )
2623                         )
2624                 );
2625
2626                 $retVal = array();
2627                 foreach( $res as $row ) {
2628                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2629                 }
2630                 return $retVal;
2631         }
2632
2633
2634         /**
2635          * Get a list of URLs to purge from the Squid cache when this
2636          * page changes
2637          *
2638          * @return \type{\arrayof{\string}} the URLs
2639          */
2640         public function getSquidURLs() {
2641                 global $wgContLang;
2642
2643                 $urls = array(
2644                         $this->getInternalURL(),
2645                         $this->getInternalURL( 'action=history' )
2646                 );
2647
2648                 // purge variant urls as well
2649                 if($wgContLang->hasVariants()){
2650                         $variants = $wgContLang->getVariants();
2651                         foreach($variants as $vCode){
2652                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2653                                 $urls[] = $this->getInternalURL('',$vCode);
2654                         }
2655                 }
2656
2657                 return $urls;
2658         }
2659
2660         /**
2661          * Purge all applicable Squid URLs
2662          */
2663         public function purgeSquid() {
2664                 global $wgUseSquid;
2665                 if ( $wgUseSquid ) {
2666                         $urls = $this->getSquidURLs();
2667                         $u = new SquidUpdate( $urls );
2668                         $u->doUpdate();
2669                 }
2670         }
2671
2672         /**
2673          * Move this page without authentication
2674          * @param &$nt \type{Title} the new page Title
2675          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2676          */
2677         public function moveNoAuth( &$nt ) {
2678                 return $this->moveTo( $nt, false );
2679         }
2680
2681         /**
2682          * Check whether a given move operation would be valid.
2683          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2684          * @param &$nt \type{Title} the new title
2685          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2686          *  should be checked
2687          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2688          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2689          */
2690         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2691                 global $wgUser;
2692
2693                 $errors = array();
2694                 if( !$nt ) {
2695                         // Normally we'd add this to $errors, but we'll get
2696                         // lots of syntax errors if $nt is not an object
2697                         return array(array('badtitletext'));
2698                 }
2699                 if( $this->equals( $nt ) ) {
2700                         $errors[] = array('selfmove');
2701                 }
2702                 if( !$this->isMovable() ) {
2703                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2704                 }
2705                 if ( $nt->getInterwiki() != '' ) {
2706                         $errors[] = array( 'immobile-target-namespace-iw' );
2707                 }
2708                 if ( !$nt->isMovable() ) {
2709                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2710                 }
2711
2712                 $oldid = $this->getArticleID();
2713                 $newid = $nt->getArticleID();
2714
2715                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2716                         $errors[] = array('articleexists');
2717                 }
2718                 if ( ( $this->getDBkey() == '' ) ||
2719                          ( !$oldid ) ||
2720                      ( $nt->getDBkey() == '' ) ) {
2721                         $errors[] = array('badarticleerror');
2722                 }
2723
2724                 // Image-specific checks
2725                 if( $this->getNamespace() == NS_FILE ) {
2726                         $file = wfLocalFile( $this );
2727                         if( $file->exists() ) {
2728                                 if( $nt->getNamespace() != NS_FILE ) {
2729                                         $errors[] = array('imagenocrossnamespace');
2730                                 }
2731                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2732                                         $errors[] = array('imageinvalidfilename');
2733                                 }
2734                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
2735                                         $errors[] = array('imagetypemismatch');
2736                                 }
2737                         }
2738                         $destfile = wfLocalFile( $nt );
2739                         if( !$wgUser->isAllowed( 'reupload-shared' ) && !$destfile->exists() && wfFindFile( $nt ) ) {
2740                                 $errors[] = array( 'file-exists-sharedrepo' );
2741                         }
2742
2743                 }
2744
2745                 if ( $auth ) {
2746                         $errors = wfMergeErrorArrays( $errors,
2747                                 $this->getUserPermissionsErrors('move', $wgUser),
2748                                 $this->getUserPermissionsErrors('edit', $wgUser),
2749                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2750                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2751                 }
2752
2753                 $match = EditPage::matchSummarySpamRegex( $reason );
2754                 if( $match !== false ) {
2755                         // This is kind of lame, won't display nice
2756                         $errors[] = array('spamprotectiontext');
2757                 }
2758
2759                 $err = null;
2760                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2761                         $errors[] = array('hookaborted', $err);
2762                 }
2763
2764                 # The move is allowed only if (1) the target doesn't exist, or
2765                 # (2) the target is a redirect to the source, and has no history
2766                 # (so we can undo bad moves right after they're done).
2767
2768                 if ( 0 != $newid ) { # Target exists; check for validity
2769                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2770                                 $errors[] = array('articleexists');
2771                         }
2772                 } else {
2773                         $tp = $nt->getTitleProtection();
2774                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2775                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2776                                 $errors[] = array('cantmove-titleprotected');
2777                         }
2778                 }
2779                 if(empty($errors))
2780                         return true;
2781                 return $errors;
2782         }
2783
2784         /**
2785          * Move a title to a new location
2786          * @param &$nt \type{Title} the new title
2787          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2788          *  should be checked
2789          * @param $reason \type{\string} The reason for the move
2790          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2791          *  Ignored if the user doesn't have the suppressredirect right.
2792          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2793          */
2794         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2795                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2796                 if( is_array( $err ) ) {
2797                         return $err;
2798                 }
2799
2800                 // If it is a file, move it first. It is done before all other moving stuff is done because it's hard to revert
2801                 $dbw = wfGetDB( DB_MASTER );
2802                 if( $this->getNamespace() == NS_FILE ) {
2803                         $file = wfLocalFile( $this );
2804                         if( $file->exists() ) {
2805                                 $status = $file->move( $nt );
2806                                 if( !$status->isOk() ) {
2807                                         return $status->getErrorsArray();
2808                                 }
2809                         }
2810                 }
2811
2812                 $pageid = $this->getArticleID();
2813                 $protected = $this->isProtected();
2814                 if( $nt->exists() ) {
2815                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2816                         $pageCountChange = ($createRedirect ? 0 : -1);
2817                 } else { # Target didn't exist, do normal move.
2818                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2819                         $pageCountChange = ($createRedirect ? 1 : 0);
2820                 }
2821
2822                 if( is_array( $err ) ) {
2823                         return $err;
2824                 }
2825                 $redirid = $this->getArticleID();
2826
2827                 // Category memberships include a sort key which may be customized.
2828                 // If it's left as the default (the page title), we need to update
2829                 // the sort key to match the new title.
2830                 //
2831                 // Be careful to avoid resetting cl_timestamp, which may disturb
2832                 // time-based lists on some sites.
2833                 //
2834                 // Warning -- if the sort key is *explicitly* set to the old title,
2835                 // we can't actually distinguish it from a default here, and it'll
2836                 // be set to the new title even though it really shouldn't.
2837                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2838                 $dbw->update( 'categorylinks',
2839                         array(
2840                                 'cl_sortkey' => $nt->getPrefixedText(),
2841                                 'cl_timestamp=cl_timestamp' ),
2842                         array(
2843                                 'cl_from' => $pageid,
2844                                 'cl_sortkey' => $this->getPrefixedText() ),
2845                         __METHOD__ );
2846
2847                 if( $protected ) {
2848                         # Protect the redirect title as the title used to be...
2849                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2850                                 array(
2851                                         'pr_page'    => $redirid,
2852                                         'pr_type'    => 'pr_type',
2853                                         'pr_level'   => 'pr_level',
2854                                         'pr_cascade' => 'pr_cascade',
2855                                         'pr_user'    => 'pr_user',
2856                                         'pr_expiry'  => 'pr_expiry'
2857                                 ),
2858                                 array( 'pr_page' => $pageid ),
2859                                 __METHOD__,
2860                                 array( 'IGNORE' )
2861                         );
2862                         # Update the protection log
2863                         $log = new LogPage( 'protect' );
2864                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2865                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2866                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2867                 }
2868
2869                 # Update watchlists
2870                 $oldnamespace = $this->getNamespace() & ~1;
2871                 $newnamespace = $nt->getNamespace() & ~1;
2872                 $oldtitle = $this->getDBkey();
2873                 $newtitle = $nt->getDBkey();
2874
2875                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2876                         WatchedItem::duplicateEntries( $this, $nt );
2877                 }
2878
2879                 # Update search engine
2880                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2881                 $u->doUpdate();
2882                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2883                 $u->doUpdate();
2884
2885                 # Update site_stats
2886                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2887                         # No longer a content page
2888                         # Not viewed, edited, removing
2889                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2890                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2891                         # Now a content page
2892                         # Not viewed, edited, adding
2893                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2894                 } elseif( $pageCountChange ) {
2895                         # Redirect added
2896                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2897                 } else {
2898                         # Nothing special
2899                         $u = false;
2900                 }
2901                 if( $u )
2902                         $u->doUpdate();
2903                 # Update message cache for interface messages
2904                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2905                         global $wgMessageCache;
2906
2907                         # @bug 17860: old article can be deleted, if this the case,
2908                         # delete it from message cache
2909                         if ( $this->getArticleID() === 0 ) {
2910                                 $wgMessageCache->replace( $this->getDBkey(), false );
2911                         } else {
2912                                 $oldarticle = new Article( $this );
2913                                 $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2914                         }
2915
2916                         $newarticle = new Article( $nt );
2917                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2918                 }
2919
2920                 global $wgUser;
2921                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2922                 return true;
2923         }
2924
2925         /**
2926          * Move page to a title which is at present a redirect to the
2927          * source page
2928          *
2929          * @param &$nt \type{Title} the page to move to, which should currently
2930          *  be a redirect
2931          * @param $reason \type{\string} The reason for the move
2932          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2933          *  Ignored if the user doesn't have the suppressredirect right
2934          */
2935         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2936                 global $wgUseSquid, $wgUser, $wgContLang;
2937
2938                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2939
2940                 if ( $reason ) {
2941                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2942                 }
2943                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
2944                 $comment = $wgContLang->truncate( $comment, 250 );
2945
2946                 $now = wfTimestampNow();
2947                 $newid = $nt->getArticleID();
2948                 $oldid = $this->getArticleID();
2949                 $latest = $this->getLatestRevID();
2950
2951                 $dbw = wfGetDB( DB_MASTER );
2952
2953                 $rcts = $dbw->timestamp( $nt->getEarliestRevTime() );
2954                 $newns = $nt->getNamespace();
2955                 $newdbk = $nt->getDBkey();
2956
2957                 # Delete the old redirect. We don't save it to history since
2958                 # by definition if we've got here it's rather uninteresting.
2959                 # We have to remove it so that the next step doesn't trigger
2960                 # a conflict on the unique namespace+title index...
2961                 $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
2962                 if ( !$dbw->cascadingDeletes() ) {
2963                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2964                         global $wgUseTrackbacks;
2965                         if ($wgUseTrackbacks)
2966                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2967                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2968                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2969                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2970                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2971                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2972                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2973                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2974                 }
2975                 // If the redirect was recently created, it may have an entry in recentchanges still
2976                 $dbw->delete( 'recentchanges',
2977                         array( 'rc_timestamp' => $rcts, 'rc_namespace' => $newns, 'rc_title' => $newdbk, 'rc_new' => 1 ),
2978                         __METHOD__
2979                 );
2980
2981                 # Save a null revision in the page's history notifying of the move
2982                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2983                 $nullRevId = $nullRevision->insertOn( $dbw );
2984
2985                 $article = new Article( $this );
2986                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2987
2988                 # Change the name of the target page:
2989                 $dbw->update( 'page',
2990                         /* SET */ array(
2991                                 'page_touched'   => $dbw->timestamp($now),
2992                                 'page_namespace' => $nt->getNamespace(),
2993                                 'page_title'     => $nt->getDBkey(),
2994                                 'page_latest'    => $nullRevId,
2995                         ),
2996                         /* WHERE */ array( 'page_id' => $oldid ),
2997                         __METHOD__
2998                 );
2999                 $nt->resetArticleID( $oldid );
3000
3001                 # Recreate the redirect, this time in the other direction.
3002                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3003                         $mwRedir = MagicWord::get( 'redirect' );
3004                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3005                         $redirectArticle = new Article( $this );
3006                         $newid = $redirectArticle->insertOn( $dbw );
3007                         $redirectRevision = new Revision( array(
3008                                 'page'    => $newid,
3009                                 'comment' => $comment,
3010                                 'text'    => $redirectText ) );
3011                         $redirectRevision->insertOn( $dbw );
3012                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3013
3014                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3015
3016                         # Now, we record the link from the redirect to the new title.
3017                         # It should have no other outgoing links...
3018                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
3019                         $dbw->insert( 'pagelinks',
3020                                 array(
3021                                         'pl_from'      => $newid,
3022                                         'pl_namespace' => $nt->getNamespace(),
3023                                         'pl_title'     => $nt->getDBkey() ),
3024                                 __METHOD__ );
3025                         $redirectSuppressed = false;
3026                 } else {
3027                         $this->resetArticleID( 0 );
3028                         $redirectSuppressed = true;
3029                 }
3030
3031                 # Log the move
3032                 $log = new LogPage( 'move' );
3033                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3034
3035                 # Purge squid
3036                 if ( $wgUseSquid ) {
3037                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
3038                         $u = new SquidUpdate( $urls );
3039                         $u->doUpdate();
3040                 }
3041
3042         }
3043
3044         /**
3045          * Move page to non-existing title.
3046          * @param &$nt \type{Title} the new Title
3047          * @param $reason \type{\string} The reason for the move
3048          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
3049          *  Ignored if the user doesn't have the suppressredirect right
3050          */
3051         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
3052                 global $wgUseSquid, $wgUser, $wgContLang;
3053
3054                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3055                 if ( $reason ) {
3056                         $comment .= wfMsgExt( 'colon-separator',
3057                                 array( 'escapenoentities', 'content' ) );
3058                         $comment .= $reason;
3059                 }
3060                 # Truncate for whole multibyte characters. +5 bytes for ellipsis
3061                 $comment = $wgContLang->truncate( $comment, 250 );
3062
3063                 $newid = $nt->getArticleID();
3064                 $oldid = $this->getArticleID();
3065                 $latest = $this->getLatestRevId();
3066
3067                 $dbw = wfGetDB( DB_MASTER );
3068                 $now = $dbw->timestamp();
3069
3070                 # Save a null revision in the page's history notifying of the move
3071                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3072                 if ( !is_object( $nullRevision ) ) {
3073                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3074                 }
3075                 $nullRevId = $nullRevision->insertOn( $dbw );
3076
3077                 $article = new Article( $this );
3078                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
3079
3080                 # Rename page entry
3081                 $dbw->update( 'page',
3082                         /* SET */ array(
3083                                 'page_touched'   => $now,
3084                                 'page_namespace' => $nt->getNamespace(),
3085                                 'page_title'     => $nt->getDBkey(),
3086                                 'page_latest'    => $nullRevId,
3087                         ),
3088                         /* WHERE */ array( 'page_id' => $oldid ),
3089                         __METHOD__
3090                 );
3091                 $nt->resetArticleID( $oldid );
3092
3093                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
3094                         # Insert redirect
3095                         $mwRedir = MagicWord::get( 'redirect' );
3096                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3097                         $redirectArticle = new Article( $this );
3098                         $newid = $redirectArticle->insertOn( $dbw );
3099                         $redirectRevision = new Revision( array(
3100                                 'page'    => $newid,
3101                                 'comment' => $comment,
3102                                 'text'    => $redirectText ) );
3103                         $redirectRevision->insertOn( $dbw );
3104                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3105
3106                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
3107
3108                         # Record the just-created redirect's linking to the page
3109                         $dbw->insert( 'pagelinks',
3110                                 array(
3111                                         'pl_from'      => $newid,
3112                                         'pl_namespace' => $nt->getNamespace(),
3113                                         'pl_title'     => $nt->getDBkey() ),
3114                                 __METHOD__ );
3115                         $redirectSuppressed = false;
3116                 } else {
3117                         $this->resetArticleID( 0 );
3118                         $redirectSuppressed = true;
3119                 }
3120
3121                 # Log the move
3122                 $log = new LogPage( 'move' );
3123                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
3124
3125                 # Purge caches as per article creation
3126                 Article::onArticleCreate( $nt );
3127
3128                 # Purge old title from squid
3129                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
3130                 $this->purgeSquid();
3131
3132         }
3133
3134         /**
3135          * Move this page's subpages to be subpages of $nt
3136          * @param $nt Title Move target
3137          * @param $auth bool Whether $wgUser's permissions should be checked
3138          * @param $reason string The reason for the move
3139          * @param $createRedirect bool Whether to create redirects from the old subpages to the new ones
3140          *  Ignored if the user doesn't have the 'suppressredirect' right
3141          * @return mixed array with old page titles as keys, and strings (new page titles) or
3142          *  arrays (errors) as values, or an error array with numeric indices if no pages were moved
3143          */
3144         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3145                 global $wgMaximumMovedPages;
3146                 // Check permissions
3147                 if( !$this->userCan( 'move-subpages' ) )
3148                         return array( 'cant-move-subpages' );
3149                 // Do the source and target namespaces support subpages?
3150                 if( !MWNamespace::hasSubpages( $this->getNamespace() ) )
3151                         return array( 'namespace-nosubpages',
3152                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3153                 if( !MWNamespace::hasSubpages( $nt->getNamespace() ) )
3154                         return array( 'namespace-nosubpages',
3155                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3156
3157                 $subpages = $this->getSubpages($wgMaximumMovedPages + 1);
3158                 $retval = array();
3159                 $count = 0;
3160                 foreach( $subpages as $oldSubpage ) {
3161                         $count++;
3162                         if( $count > $wgMaximumMovedPages ) {
3163                                 $retval[$oldSubpage->getPrefixedTitle()] =
3164                                                 array( 'movepage-max-pages',
3165                                                         $wgMaximumMovedPages );
3166                                 break;
3167                         }
3168
3169                         // We don't know whether this function was called before
3170                         // or after moving the root page, so check both
3171                         // $this and $nt
3172                         if( $oldSubpage->getArticleId() == $this->getArticleId() ||
3173                                         $oldSubpage->getArticleID() == $nt->getArticleId() )
3174                                 // When moving a page to a subpage of itself,
3175                                 // don't move it twice
3176                                 continue;
3177                         $newPageName = preg_replace(
3178                                         '#^'.preg_quote( $this->getDBkey(), '#' ).'#',
3179                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3180                                         $oldSubpage->getDBkey() );
3181                         if( $oldSubpage->isTalkPage() ) {
3182                                 $newNs = $nt->getTalkPage()->getNamespace();
3183                         } else {
3184                                 $newNs = $nt->getSubjectPage()->getNamespace();
3185                         }
3186                         # Bug 14385: we need makeTitleSafe because the new page names may
3187                         # be longer than 255 characters.
3188                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3189
3190                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3191                         if( $success === true ) {
3192                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3193                         } else {
3194                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3195                         }
3196                 }
3197                 return $retval;
3198         }
3199
3200         /**
3201          * Checks if this page is just a one-rev redirect.
3202          * Adds lock, so don't use just for light purposes.
3203          *
3204          * @return \type{\bool} TRUE or FALSE
3205          */
3206         public function isSingleRevRedirect() {
3207                 $dbw = wfGetDB( DB_MASTER );
3208                 # Is it a redirect?
3209                 $row = $dbw->selectRow( 'page',
3210                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3211                         $this->pageCond(),
3212                         __METHOD__,
3213                         array( 'FOR UPDATE' )
3214                 );
3215                 # Cache some fields we may want
3216                 $this->mArticleID = $row ? intval($row->page_id) : 0;
3217                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3218                 $this->mLatestID = $row ? intval($row->page_latest) : false;
3219                 if( !$this->mRedirect ) {
3220                         return false;
3221                 }
3222                 # Does the article have a history?
3223                 $row = $dbw->selectField( array( 'page', 'revision'),
3224                         'rev_id',
3225                         array( 'page_namespace' => $this->getNamespace(),
3226                                 'page_title' => $this->getDBkey(),
3227                                 'page_id=rev_page',
3228                                 'page_latest != rev_id'
3229                         ),
3230                         __METHOD__,
3231                         array( 'FOR UPDATE' )
3232                 );
3233                 # Return true if there was no history
3234                 return ($row === false);
3235         }
3236
3237         /**
3238          * Checks if $this can be moved to a given Title
3239          * - Selects for update, so don't call it unless you mean business
3240          *
3241          * @param &$nt \type{Title} the new title to check
3242          * @return \type{\bool} TRUE or FALSE
3243          */
3244         public function isValidMoveTarget( $nt ) {
3245                 $dbw = wfGetDB( DB_MASTER );
3246                 # Is it an existsing file?
3247                 if( $nt->getNamespace() == NS_FILE ) {
3248                         $file = wfLocalFile( $nt );
3249                         if( $file->exists() ) {
3250                                 wfDebug( __METHOD__ . ": file exists\n" );
3251                                 return false;
3252                         }
3253                 }
3254                 # Is it a redirect with no history?
3255                 if( !$nt->isSingleRevRedirect() ) {
3256                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3257                         return false;
3258                 }
3259                 # Get the article text
3260                 $rev = Revision::newFromTitle( $nt );
3261                 $text = $rev->getText();
3262                 # Does the redirect point to the source?
3263                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3264                 $m = array();
3265                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3266                         $redirTitle = Title::newFromText( $m[1] );
3267                         if( !is_object( $redirTitle ) ||
3268                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3269                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3270                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3271                                 return false;
3272                         }
3273                 } else {
3274                         # Fail safe
3275                         wfDebug( __METHOD__ . ": failsafe\n" );
3276                         return false;
3277                 }
3278                 return true;
3279         }
3280
3281         /**
3282          * Can this title be added to a user's watchlist?
3283          *
3284          * @return \type{\bool} TRUE or FALSE
3285          */
3286         public function isWatchable() {
3287                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3288         }
3289
3290         /**
3291          * Get categories to which this Title belongs and return an array of
3292          * categories' names.
3293          *
3294          * @return \type{\array} array an array of parents in the form:
3295          *      $parent => $currentarticle
3296          */
3297         public function getParentCategories() {
3298                 global $wgContLang;
3299
3300                 $titlekey = $this->getArticleId();
3301                 $dbr = wfGetDB( DB_SLAVE );
3302                 $categorylinks = $dbr->tableName( 'categorylinks' );
3303
3304                 # NEW SQL
3305                 $sql = "SELECT * FROM $categorylinks"
3306                      ." WHERE cl_from='$titlekey'"
3307                          ." AND cl_from <> '0'"
3308                          ." ORDER BY cl_sortkey";
3309
3310                 $res = $dbr->query( $sql );
3311
3312                 if( $dbr->numRows( $res ) > 0 ) {
3313                         foreach( $res as $row )
3314                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3315                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3316                         $dbr->freeResult( $res );
3317                 } else {
3318                         $data = array();
3319                 }
3320                 return $data;
3321         }
3322
3323         /**
3324          * Get a tree of parent categories
3325          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3326          * @return \type{\array} Tree of parent categories
3327          */
3328         public function getParentCategoryTree( $children = array() ) {
3329                 $stack = array();
3330                 $parents = $this->getParentCategories();
3331
3332                 if( $parents ) {
3333                         foreach( $parents as $parent => $current ) {
3334                                 if ( array_key_exists( $parent, $children ) ) {
3335                                         # Circular reference
3336                                         $stack[$parent] = array();
3337                                 } else {
3338                                         $nt = Title::newFromText($parent);
3339                                         if ( $nt ) {
3340                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3341                                         }
3342                                 }
3343                         }
3344                         return $stack;
3345                 } else {
3346                         return array();
3347                 }
3348         }
3349
3350
3351         /**
3352          * Get an associative array for selecting this title from
3353          * the "page" table
3354          *
3355          * @return \type{\array} Selection array
3356          */
3357         public function pageCond() {
3358                 if( $this->mArticleID > 0 ) {
3359                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3360                         return array( 'page_id' => $this->mArticleID );
3361                 } else {
3362                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3363                 }
3364         }
3365
3366         /**
3367          * Get the revision ID of the previous revision
3368          *
3369          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3370          * @param $flags \type{\int} GAID_FOR_UPDATE
3371          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3372          */
3373         public function getPreviousRevisionID( $revId, $flags=0 ) {
3374                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3375                 return $db->selectField( 'revision', 'rev_id',
3376                         array(
3377                                 'rev_page' => $this->getArticleId($flags),
3378                                 'rev_id < ' . intval( $revId )
3379                         ),
3380                         __METHOD__,
3381                         array( 'ORDER BY' => 'rev_id DESC' )
3382                 );
3383         }
3384
3385         /**
3386          * Get the revision ID of the next revision
3387          *
3388          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3389          * @param $flags \type{\int} GAID_FOR_UPDATE
3390          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3391          */
3392         public function getNextRevisionID( $revId, $flags=0 ) {
3393                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3394                 return $db->selectField( 'revision', 'rev_id',
3395                         array(
3396                                 'rev_page' => $this->getArticleId($flags),
3397                                 'rev_id > ' . intval( $revId )
3398                         ),
3399                         __METHOD__,
3400                         array( 'ORDER BY' => 'rev_id' )
3401                 );
3402         }
3403
3404         /**
3405          * Get the first revision of the page
3406          *
3407          * @param $flags \type{\int} GAID_FOR_UPDATE
3408          * @return Revision (or NULL if page doesn't exist)
3409          */
3410         public function getFirstRevision( $flags=0 ) {
3411                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3412                 $pageId = $this->getArticleId($flags);
3413                 if( !$pageId ) return null;
3414                 $row = $db->selectRow( 'revision', '*',
3415                         array( 'rev_page' => $pageId ),
3416                         __METHOD__,
3417                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3418                 );
3419                 if( !$row ) {
3420                         return null;
3421                 } else {
3422                         return new Revision( $row );
3423                 }
3424         }
3425
3426         /**
3427          * Check if this is a new page
3428          *
3429          * @return bool
3430          */
3431         public function isNewPage() {
3432                 $dbr = wfGetDB( DB_SLAVE );
3433                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3434         }
3435
3436         /**
3437          * Get the oldest revision timestamp of this page
3438          *
3439          * @return string, MW timestamp
3440          */
3441         public function getEarliestRevTime() {
3442                 $dbr = wfGetDB( DB_SLAVE );
3443                 if( $this->exists() ) {
3444                         $min = $dbr->selectField( 'revision',
3445                                 'MIN(rev_timestamp)',
3446                                 array( 'rev_page' => $this->getArticleId() ),
3447                                 __METHOD__ );
3448                         return wfTimestampOrNull( TS_MW, $min );
3449                 }
3450                 return null;
3451         }
3452
3453         /**
3454          * Get the number of revisions between the given revision IDs.
3455          * Used for diffs and other things that really need it.
3456          *
3457          * @param $old \type{\int} Revision ID.
3458          * @param $new \type{\int} Revision ID.
3459          * @return \type{\int} Number of revisions between these IDs.
3460          */
3461         public function countRevisionsBetween( $old, $new ) {
3462                 $dbr = wfGetDB( DB_SLAVE );
3463                 return (int)$dbr->selectField( 'revision', 'count(*)',
3464                         'rev_page = ' . intval( $this->getArticleId() ) .
3465                         ' AND rev_id > ' . intval( $old ) .
3466                         ' AND rev_id < ' . intval( $new ),
3467                         __METHOD__
3468                 );
3469         }
3470
3471         /**
3472          * Compare with another title.
3473          *
3474          * @param \type{Title} $title
3475          * @return \type{\bool} TRUE or FALSE
3476          */
3477         public function equals( Title $title ) {
3478                 // Note: === is necessary for proper matching of number-like titles.
3479                 return $this->getInterwiki() === $title->getInterwiki()
3480                         && $this->getNamespace() == $title->getNamespace()
3481                         && $this->getDBkey() === $title->getDBkey();
3482         }
3483
3484         /**
3485          * Callback for usort() to do title sorts by (namespace, title)
3486          *
3487          * @return int result of string comparison, or namespace comparison
3488          */
3489         public static function compare( $a, $b ) {
3490                 if( $a->getNamespace() == $b->getNamespace() ) {
3491                         return strcmp( $a->getText(), $b->getText() );
3492                 } else {
3493                         return $a->getNamespace() - $b->getNamespace();
3494                 }
3495         }
3496
3497         /**
3498          * Return a string representation of this title
3499          *
3500          * @return \type{\string} String representation of this title
3501          */
3502         public function __toString() {
3503                 return $this->getPrefixedText();
3504         }
3505
3506         /**
3507          * Check if page exists.  For historical reasons, this function simply
3508          * checks for the existence of the title in the page table, and will
3509          * thus return false for interwiki links, special pages and the like.
3510          * If you want to know if a title can be meaningfully viewed, you should
3511          * probably call the isKnown() method instead.
3512          *
3513          * @return \type{\bool} TRUE or FALSE
3514          */
3515         public function exists() {
3516                 return $this->getArticleId() != 0;
3517         }
3518
3519         /**
3520          * Should links to this title be shown as potentially viewable (i.e. as
3521          * "bluelinks"), even if there's no record by this title in the page
3522          * table?
3523          *
3524          * This function is semi-deprecated for public use, as well as somewhat
3525          * misleadingly named.  You probably just want to call isKnown(), which
3526          * calls this function internally.
3527          *
3528          * (ISSUE: Most of these checks are cheap, but the file existence check
3529          * can potentially be quite expensive.  Including it here fixes a lot of
3530          * existing code, but we might want to add an optional parameter to skip
3531          * it and any other expensive checks.)
3532          *
3533          * @return \type{\bool} TRUE or FALSE
3534          */
3535         public function isAlwaysKnown() {
3536                 if( $this->mInterwiki != '' ) {
3537                         return true;  // any interwiki link might be viewable, for all we know
3538                 }
3539                 switch( $this->mNamespace ) {
3540                 case NS_MEDIA:
3541                 case NS_FILE:
3542                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3543                 case NS_SPECIAL:
3544                         return SpecialPage::exists( $this->getDBkey() );  // valid special page
3545                 case NS_MAIN:
3546                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3547                 case NS_MEDIAWIKI:
3548                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3549                         // the full l10n of that language to be loaded. That takes much memory and
3550                         // isn't needed. So we strip the language part away.
3551                         // Also, extension messages which are not loaded, are shown as red, because
3552                         // we don't call MessageCache::loadAllMessages.
3553                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3554                         return wfMsgWeirdKey( $basename );  // known system message
3555                 default:
3556                         return false;
3557                 }
3558         }
3559
3560         /**
3561          * Does this title refer to a page that can (or might) be meaningfully
3562          * viewed?  In particular, this function may be used to determine if
3563          * links to the title should be rendered as "bluelinks" (as opposed to
3564          * "redlinks" to non-existent pages).
3565          *
3566          * @return \type{\bool} TRUE or FALSE
3567          */
3568         public function isKnown() {
3569                 return $this->exists() || $this->isAlwaysKnown();
3570         }
3571
3572         /**
3573         * Is this in a namespace that allows actual pages?
3574         *
3575         * @return \type{\bool} TRUE or FALSE
3576         * @internal note -- uses hardcoded namespace index instead of constants
3577         */
3578         public function canExist() {
3579                 return $this->mNamespace >=0 && $this->mNamespace != NS_MEDIA;
3580         }
3581
3582         /**
3583          * Update page_touched timestamps and send squid purge messages for
3584          * pages linking to this title. May be sent to the job queue depending
3585          * on the number of links. Typically called on create and delete.
3586          */
3587         public function touchLinks() {
3588                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3589                 $u->doUpdate();
3590
3591                 if ( $this->getNamespace() == NS_CATEGORY ) {
3592                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3593                         $u->doUpdate();
3594                 }
3595         }
3596
3597         /**
3598          * Get the last touched timestamp
3599          * @param Database $db, optional db
3600          * @return \type{\string} Last touched timestamp
3601          */
3602         public function getTouched( $db = null ) {
3603                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3604                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3605                 return $touched;
3606         }
3607
3608         /**
3609          * Get the timestamp when this page was updated since the user last saw it.
3610          * @param User $user
3611          * @return mixed string/NULL
3612          */
3613         public function getNotificationTimestamp( $user = null ) {
3614                 global $wgUser, $wgShowUpdatedMarker;
3615                 // Assume current user if none given
3616                 if( !$user ) $user = $wgUser;
3617                 // Check cache first
3618                 $uid = $user->getId();
3619                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3620                         return $this->mNotificationTimestamp[$uid];
3621                 }
3622                 if( !$uid || !$wgShowUpdatedMarker ) {
3623                         return $this->mNotificationTimestamp[$uid] = false;
3624                 }
3625                 // Don't cache too much!
3626                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3627                         $this->mNotificationTimestamp = array();
3628                 }
3629                 $dbr = wfGetDB( DB_SLAVE );
3630                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3631                         'wl_notificationtimestamp',
3632                         array( 'wl_namespace' => $this->getNamespace(),
3633                                 'wl_title' => $this->getDBkey(),
3634                                 'wl_user' => $user->getId()
3635                         ),
3636                         __METHOD__
3637                 );
3638                 return $this->mNotificationTimestamp[$uid];
3639         }
3640
3641         /**
3642          * Get the trackback URL for this page
3643          * @return \type{\string} Trackback URL
3644          */
3645         public function trackbackURL() {
3646                 global $wgScriptPath, $wgServer, $wgScriptExtension;
3647
3648                 return "$wgServer$wgScriptPath/trackback$wgScriptExtension?article="
3649                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3650         }
3651
3652         /**
3653          * Get the trackback RDF for this page
3654          * @return \type{\string} Trackback RDF
3655          */
3656         public function trackbackRDF() {
3657                 $url = htmlspecialchars($this->getFullURL());
3658                 $title = htmlspecialchars($this->getText());
3659                 $tburl = $this->trackbackURL();
3660
3661                 // Autodiscovery RDF is placed in comments so HTML validator
3662                 // won't barf. This is a rather icky workaround, but seems
3663                 // frequently used by this kind of RDF thingy.
3664                 //
3665                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3666                 return "<!--
3667 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3668          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3669          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3670 <rdf:Description
3671    rdf:about=\"$url\"
3672    dc:identifier=\"$url\"
3673    dc:title=\"$title\"
3674    trackback:ping=\"$tburl\" />
3675 </rdf:RDF>
3676 -->";
3677         }
3678
3679         /**
3680          * Generate strings used for xml 'id' names in monobook tabs
3681          * @param $prepend string defaults to 'nstab-'
3682          * @return \type{\string} XML 'id' name
3683          */
3684         public function getNamespaceKey( $prepend = 'nstab-' ) {
3685                 global $wgContLang;
3686                 // Gets the subject namespace if this title
3687                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
3688                 // Checks if cononical namespace name exists for namespace
3689                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
3690                         // Uses canonical namespace name
3691                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
3692                 } else {
3693                         // Uses text of namespace
3694                         $namespaceKey = $this->getSubjectNsText();
3695                 }
3696                 // Makes namespace key lowercase
3697                 $namespaceKey = $wgContLang->lc( $namespaceKey );
3698                 // Uses main
3699                 if ( $namespaceKey == '' ) {
3700                         $namespaceKey = 'main';
3701                 }
3702                 // Changes file to image for backwards compatibility
3703                 if ( $namespaceKey == 'file' ) {
3704                         $namespaceKey = 'image';
3705                 }
3706                 return $prepend . $namespaceKey;
3707         }
3708
3709         /**
3710          * Returns true if this is a special page.
3711          * @return boolean
3712          */
3713         public function isSpecialPage( ) {
3714                 return $this->getNamespace() == NS_SPECIAL;
3715         }
3716
3717         /**
3718          * Returns true if this title resolves to the named special page
3719          * @param $name \type{\string} The special page name
3720          * @return boolean
3721          */
3722         public function isSpecial( $name ) {
3723                 if ( $this->getNamespace() == NS_SPECIAL ) {
3724                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3725                         if ( $name == $thisName ) {
3726                                 return true;
3727                         }
3728                 }
3729                 return false;
3730         }
3731
3732         /**
3733          * If the Title refers to a special page alias which is not the local default,
3734          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3735          */
3736         public function fixSpecialName() {
3737                 if ( $this->getNamespace() == NS_SPECIAL ) {
3738                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3739                         if ( $canonicalName ) {
3740                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3741                                 if ( $localName != $this->mDbkeyform ) {
3742                                         return Title::makeTitle( NS_SPECIAL, $localName );
3743                                 }
3744                         }
3745                 }
3746                 return $this;
3747         }
3748
3749         /**
3750          * Is this Title in a namespace which contains content?
3751          * In other words, is this a content page, for the purposes of calculating
3752          * statistics, etc?
3753          *
3754          * @return \type{\bool} TRUE or FALSE
3755          */
3756         public function isContentPage() {
3757                 return MWNamespace::isContent( $this->getNamespace() );
3758         }
3759
3760         /**
3761          * Get all extant redirects to this Title
3762          *
3763          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3764          *            NULL to consider all namespaces
3765          * @return \type{\arrayof{Title}} Redirects to this title
3766          */
3767         public function getRedirectsHere( $ns = null ) {
3768                 $redirs = array();
3769
3770                 $dbr = wfGetDB( DB_SLAVE );
3771                 $where = array(
3772                         'rd_namespace' => $this->getNamespace(),
3773                         'rd_title' => $this->getDBkey(),
3774                         'rd_from = page_id'
3775                 );
3776                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3777
3778                 $res = $dbr->select(
3779                         array( 'redirect', 'page' ),
3780                         array( 'page_namespace', 'page_title' ),
3781                         $where,
3782                         __METHOD__
3783                 );
3784
3785
3786                 foreach( $res as $row ) {
3787                         $redirs[] = self::newFromRow( $row );
3788                 }
3789                 return $redirs;
3790         }
3791
3792         /**
3793          * Check if this Title is a valid redirect target
3794          *
3795          * @return \type{\bool} TRUE or FALSE
3796          */
3797         public function isValidRedirectTarget() {
3798                 global $wgInvalidRedirectTargets;
3799
3800                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3801                 if( $this->isSpecial( 'Userlogout' ) ) {
3802                         return false;
3803                 }
3804
3805                 foreach( $wgInvalidRedirectTargets as $target ) {
3806                         if( $this->isSpecial( $target ) ) {
3807                                 return false;
3808                         }
3809                 }
3810
3811                 return true;
3812         }
3813
3814         /**
3815          * Get a backlink cache object
3816          * @return object BacklinkCache
3817          */
3818         function getBacklinkCache() {
3819                 if ( is_null( $this->mBacklinkCache ) ) {
3820                         $this->mBacklinkCache = new BacklinkCache( $this );
3821                 }
3822                 return $this->mBacklinkCache;
3823         }
3824
3825         /**
3826          * Whether the magic words __INDEX__ and __NOINDEX__ function for
3827          * this page.
3828          * @return Bool
3829          */
3830         public function canUseNoindex(){
3831                 global $wgArticleRobotPolicies, $wgContentNamespaces,
3832                        $wgExemptFromUserRobotsControl;
3833
3834                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
3835                         ? $wgContentNamespaces
3836                         : $wgExemptFromUserRobotsControl;
3837
3838                 return !in_array( $this->mNamespace, $bannedNamespaces );
3839
3840         }
3841
3842         /**
3843          * Returns restriction types for the current Title
3844          * @return array applicable restriction types
3845          */
3846         public function getRestrictionTypes() {
3847                 global $wgRestrictionTypes;
3848                 $types = $this->exists() ? $wgRestrictionTypes : array('create');
3849
3850                 if ( $this->getNamespace() == NS_FILE ) {
3851                         $types[] = 'upload';
3852                 }
3853
3854                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
3855
3856                 return $types;
3857         }
3858 }