includes/Title.php

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