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                 $errors = array();
1168
1169                 // Use getUserPermissionsErrors instead
1170                 if( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1171                         wfProfileOut( __METHOD__ );
1172                         return $result ? array() : array( array( 'badaccess-group0' ) );
1173                 }
1174                 // Check getUserPermissionsErrors hook
1175                 if( !wfRunHooks( 'getUserPermissionsErrors', array(&$this,&$user,$action,&$result) ) ) {
1176                         if( is_array($result) && count($result) && !is_array($result[0]) )
1177                                 $errors[] = $result; # A single array representing an error
1178                         else if( is_array($result) && is_array($result[0]) )
1179                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1180                         else if( $result !== '' && is_string($result) )
1181                                 $errors[] = array($result); # A string representing a message-id
1182                         else if( $result === false )
1183                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1184                 }
1185                 # Short-circuit point
1186                 if( $short && count($errors) > 0 ) {
1187                         wfProfileOut( __METHOD__ );
1188                         return $errors;
1189                 }
1190                 // Check getUserPermissionsErrorsExpensive hook
1191                 if( $doExpensiveQueries && !wfRunHooks( 'getUserPermissionsErrorsExpensive', array(&$this,&$user,$action,&$result) ) ) {
1192                         if( is_array($result) && count($result) && !is_array($result[0]) )
1193                                 $errors[] = $result; # A single array representing an error
1194                         else if( is_array($result) && is_array($result[0]) )
1195                                 $errors = array_merge( $errors, $result ); # A nested array representing multiple errors
1196                         else if( $result !== '' && is_string($result) )
1197                                 $errors[] = array($result); # A string representing a message-id
1198                         else if( $result === false )
1199                                 $errors[] = array('badaccess-group0'); # a generic "We don't want them to do that"
1200                 }
1201                 # Short-circuit point
1202                 if( $short && count($errors) > 0 ) {
1203                         wfProfileOut( __METHOD__ );
1204                         return $errors;
1205                 }
1206
1207                 // TODO: document
1208                 $specialOKActions = array( 'createaccount', 'execute' );
1209                 if( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions) ) {
1210                         $errors[] = array('ns-specialprotected');
1211                 }
1212
1213                 if( $this->isNamespaceProtected() ) {
1214                         $ns = $this->getNamespace() == NS_MAIN ?
1215                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1216                         $errors[] = NS_MEDIAWIKI == $this->mNamespace ?
1217                                 array('protectedinterface') : array( 'namespaceprotected',  $ns );
1218                 }
1219
1220                 # protect css/js subpages of user pages
1221                 # XXX: this might be better using restrictions
1222                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1223                 if( $this->isCssJsSubpage() && !$user->isAllowed('editusercssjs')
1224                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) )
1225                 {
1226                         $errors[] = array('customcssjsprotected');
1227                 }
1228
1229                 if( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1230                         # We /could/ use the protection level on the source page, but it's fairly ugly
1231                         #  as we have to establish a precedence hierarchy for pages included by multiple
1232                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1233                         #  as they could remove the protection anyway.
1234                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1235                         # Cascading protection depends on more than this page...
1236                         # Several cascading protected pages may include this page...
1237                         # Check each cascading level
1238                         # This is only for protection restrictions, not for all actions
1239                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1240                                 foreach( $restrictions[$action] as $right ) {
1241                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1242                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1243                                                 $pages = '';
1244                                                 foreach( $cascadingSources as $page )
1245                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1246                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1247                                         }
1248                                 }
1249                         }
1250                 }
1251                 # Short-circuit point
1252                 if( $short && count($errors) > 0 ) {
1253                         wfProfileOut( __METHOD__ );
1254                         return $errors;
1255                 }
1256
1257                 foreach( $this->getRestrictions($action) as $right ) {
1258                         // Backwards compatibility, rewrite sysop -> protect
1259                         if( $right == 'sysop' ) {
1260                                 $right = 'protect';
1261                         }
1262                         if( '' != $right && !$user->isAllowed( $right ) ) {
1263                                 // Users with 'editprotected' permission can edit protected pages
1264                                 if( $action=='edit' && $user->isAllowed( 'editprotected' ) ) {
1265                                         // Users with 'editprotected' permission cannot edit protected pages
1266                                         // with cascading option turned on.
1267                                         if( $this->mCascadeRestriction ) {
1268                                                 $errors[] = array( 'protectedpagetext', $right );
1269                                         }
1270                                 } else {
1271                                         $errors[] = array( 'protectedpagetext', $right );
1272                                 }
1273                         }
1274                 }
1275                 # Short-circuit point
1276                 if( $short && count($errors) > 0 ) {
1277                         wfProfileOut( __METHOD__ );
1278                         return $errors;
1279                 }
1280
1281                 if( $action == 'protect' ) {
1282                         if( $this->getUserPermissionsErrors('edit', $user) != array() ) {
1283                                 $errors[] = array( 'protect-cantedit' ); // If they can't edit, they shouldn't protect.
1284                         }
1285                 }
1286
1287                 if( $action == 'create' ) {
1288                         $title_protection = $this->getTitleProtection();
1289                         if( is_array($title_protection) ) {
1290                                 extract($title_protection); // is this extract() really needed?
1291
1292                                 if( $pt_create_perm == 'sysop' ) {
1293                                         $pt_create_perm = 'protect'; // B/C
1294                                 }
1295                                 if( $pt_create_perm == '' || !$user->isAllowed($pt_create_perm) ) {
1296                                         $errors[] = array( 'titleprotected', User::whoIs($pt_user), $pt_reason );
1297                                 }
1298                         }
1299
1300                         if( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1301                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) )
1302                         {
1303                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1304                         }
1305                 } elseif( $action == 'move' ) {
1306                         if( !$user->isAllowed( 'move' ) ) {
1307                                 // User can't move anything
1308                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1309                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1310                                         && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1311                         {
1312                                 // Show user page-specific message only if the user can move other pages
1313                                 $errors[] = array( 'cant-move-user-page' );
1314                         }
1315                         // Check if user is allowed to move files if it's a file
1316                         if( $this->getNamespace() == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1317                                 $errors[] = array( 'movenotallowedfile' );
1318                         }
1319                         // Check for immobile pages
1320                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1321                                 // Specific message for this case
1322                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1323                         } elseif( !$this->isMovable() ) {
1324                                 // Less specific message for rarer cases
1325                                 $errors[] = array( 'immobile-page' );
1326                         }
1327                 } elseif( $action == 'move-target' ) {
1328                         if( !$user->isAllowed( 'move' ) ) {
1329                                 // User can't move anything
1330                                 $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1331                         } elseif( !$user->isAllowed( 'move-rootuserpages' )
1332                                 && $this->getNamespace() == NS_USER && !$this->isSubpage() )
1333                         {
1334                                 // Show user page-specific message only if the user can move other pages
1335                                 $errors[] = array( 'cant-move-to-user-page' );
1336                         }
1337                         if( !MWNamespace::isMovable( $this->getNamespace() ) ) {
1338                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1339                         } elseif( !$this->isMovable() ) {
1340                                 $errors[] = array( 'immobile-target-page' );
1341                         }
1342                 } elseif( !$user->isAllowed( $action ) ) {
1343                         $return = null;
1344                         $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
1345                                 User::getGroupsWithPermission( $action ) );
1346                         if( $groups ) {
1347                                 $return = array( 'badaccess-groups',
1348                                         array( implode( ', ', $groups ), count( $groups ) ) );
1349                         } else {
1350                                 $return = array( "badaccess-group0" );
1351                         }
1352                         $errors[] = $return;
1353                 }
1354
1355                 wfProfileOut( __METHOD__ );
1356                 return $errors;
1357         }
1358
1359         /**
1360          * Is this title subject to title protection?
1361          * @return \type{\mixed} An associative array representing any existent title
1362          *   protection, or false if there's none.
1363          */
1364         private function getTitleProtection() {
1365                 // Can't protect pages in special namespaces
1366                 if ( $this->getNamespace() < 0 ) {
1367                         return false;
1368                 }
1369
1370                 $dbr = wfGetDB( DB_SLAVE );
1371                 $res = $dbr->select( 'protected_titles', '*',
1372                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1373                         __METHOD__ );
1374
1375                 if ($row = $dbr->fetchRow( $res )) {
1376                         return $row;
1377                 } else {
1378                         return false;
1379                 }
1380         }
1381
1382         /**
1383          * Update the title protection status
1384          * @param $create_perm \type{\string} Permission required for creation
1385          * @param $reason \type{\string} Reason for protection
1386          * @param $expiry \type{\string} Expiry timestamp
1387          */
1388         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
1389                 global $wgUser,$wgContLang;
1390
1391                 if ($create_perm == implode(',',$this->getRestrictions('create'))
1392                         && $expiry == $this->mRestrictionsExpiry['create']) {
1393                         // No change
1394                         return true;
1395                 }
1396
1397                 list ($namespace, $title) = array( $this->getNamespace(), $this->getDBkey() );
1398
1399                 $dbw = wfGetDB( DB_MASTER );
1400
1401                 $encodedExpiry = Block::encodeExpiry($expiry, $dbw );
1402
1403                 $expiry_description = '';
1404                 if ( $encodedExpiry != 'infinity' ) {
1405                         $expiry_description = ' (' . wfMsgForContent( 'protect-expiring', $wgContLang->timeanddate( $expiry ) , $wgContLang->date( $expiry ) , $wgContLang->time( $expiry ) ).')';
1406                 }
1407                 else {
1408                         $expiry_description .= ' (' . wfMsgForContent( 'protect-expiry-indefinite' ).')';
1409                 }
1410
1411                 # Update protection table
1412                 if ($create_perm != '' ) {
1413                         $dbw->replace( 'protected_titles', array(array('pt_namespace', 'pt_title')),
1414                                 array( 'pt_namespace' => $namespace, 'pt_title' => $title
1415                                         , 'pt_create_perm' => $create_perm
1416                                         , 'pt_timestamp' => Block::encodeExpiry(wfTimestampNow(), $dbw)
1417                                         , 'pt_expiry' => $encodedExpiry
1418                                         , 'pt_user' => $wgUser->getId(), 'pt_reason' => $reason ), __METHOD__  );
1419                 } else {
1420                         $dbw->delete( 'protected_titles', array( 'pt_namespace' => $namespace,
1421                                 'pt_title' => $title ), __METHOD__ );
1422                 }
1423                 # Update the protection log
1424                 $log = new LogPage( 'protect' );
1425
1426                 if( $create_perm ) {
1427                         $params = array("[create=$create_perm] $expiry_description",'');
1428                         $log->addEntry( $this->mRestrictions['create'] ? 'modify' : 'protect', $this, trim( $reason ), $params );
1429                 } else {
1430                         $log->addEntry( 'unprotect', $this, $reason );
1431                 }
1432
1433                 return true;
1434         }
1435
1436         /**
1437          * Remove any title protection due to page existing
1438          */
1439         public function deleteTitleProtection() {
1440                 $dbw = wfGetDB( DB_MASTER );
1441
1442                 $dbw->delete( 'protected_titles',
1443                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
1444                         __METHOD__ );
1445         }
1446
1447         /**
1448          * Can $wgUser edit this page?
1449          * @return \type{\bool} TRUE or FALSE
1450          * @deprecated use userCan('edit')
1451          */
1452         public function userCanEdit( $doExpensiveQueries = true ) {
1453                 return $this->userCan( 'edit', $doExpensiveQueries );
1454         }
1455
1456         /**
1457          * Can $wgUser create this page?
1458          * @return \type{\bool} TRUE or FALSE
1459          * @deprecated use userCan('create')
1460          */
1461         public function userCanCreate( $doExpensiveQueries = true ) {
1462                 return $this->userCan( 'create', $doExpensiveQueries );
1463         }
1464
1465         /**
1466          * Can $wgUser move this page?
1467          * @return \type{\bool} TRUE or FALSE
1468          * @deprecated use userCan('move')
1469          */
1470         public function userCanMove( $doExpensiveQueries = true ) {
1471                 return $this->userCan( 'move', $doExpensiveQueries );
1472         }
1473
1474         /**
1475          * Would anybody with sufficient privileges be able to move this page?
1476          * Some pages just aren't movable.
1477          *
1478          * @return \type{\bool} TRUE or FALSE
1479          */
1480         public function isMovable() {
1481                 return MWNamespace::isMovable( $this->getNamespace() ) && $this->getInterwiki() == '';
1482         }
1483
1484         /**
1485          * Can $wgUser read this page?
1486          * @return \type{\bool} TRUE or FALSE
1487          * @todo fold these checks into userCan()
1488          */
1489         public function userCanRead() {
1490                 global $wgUser, $wgGroupPermissions;
1491
1492                 $result = null;
1493                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1494                 if ( $result !== null ) {
1495                         return $result;
1496                 }
1497
1498                 # Shortcut for public wikis, allows skipping quite a bit of code
1499                 if ( !empty( $wgGroupPermissions['*'] ) )
1500                         return true;
1501
1502                 if( $wgUser->isAllowed( 'read' ) ) {
1503                         return true;
1504                 } else {
1505                         global $wgWhitelistRead;
1506
1507                         /**
1508                          * Always grant access to the login page.
1509                          * Even anons need to be able to log in.
1510                         */
1511                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1512                                 return true;
1513                         }
1514
1515                         /**
1516                          * Bail out if there isn't whitelist
1517                          */
1518                         if( !is_array($wgWhitelistRead) ) {
1519                                 return false;
1520                         }
1521
1522                         /**
1523                          * Check for explicit whitelisting
1524                          */
1525                         $name = $this->getPrefixedText();
1526                         $dbName = $this->getPrefixedDBKey();
1527                         // Check with and without underscores
1528                         if( in_array($name,$wgWhitelistRead,true) || in_array($dbName,$wgWhitelistRead,true) )
1529                                 return true;
1530
1531                         /**
1532                          * Old settings might have the title prefixed with
1533                          * a colon for main-namespace pages
1534                          */
1535                         if( $this->getNamespace() == NS_MAIN ) {
1536                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1537                                         return true;
1538                         }
1539
1540                         /**
1541                          * If it's a special page, ditch the subpage bit
1542                          * and check again
1543                          */
1544                         if( $this->getNamespace() == NS_SPECIAL ) {
1545                                 $name = $this->getDBkey();
1546                                 list( $name, /* $subpage */) = SpecialPage::resolveAliasWithSubpage( $name );
1547                                 if ( $name === false ) {
1548                                         # Invalid special page, but we show standard login required message
1549                                         return false;
1550                                 }
1551
1552                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1553                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1554                                         return true;
1555                         }
1556
1557                 }
1558                 return false;
1559         }
1560
1561         /**
1562          * Is this a talk page of some sort?
1563          * @return \type{\bool} TRUE or FALSE
1564          */
1565         public function isTalkPage() {
1566                 return MWNamespace::isTalk( $this->getNamespace() );
1567         }
1568
1569         /**
1570          * Is this a subpage?
1571          * @return \type{\bool} TRUE or FALSE
1572          */
1573         public function isSubpage() {
1574                 return MWNamespace::hasSubpages( $this->mNamespace )
1575                         ? strpos( $this->getText(), '/' ) !== false
1576                         : false;
1577         }
1578
1579         /**
1580          * Does this have subpages?  (Warning, usually requires an extra DB query.)
1581          * @return \type{\bool} TRUE or FALSE
1582          */
1583         public function hasSubpages() {
1584                 if( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1585                         # Duh
1586                         return false;
1587                 }
1588
1589                 # We dynamically add a member variable for the purpose of this method
1590                 # alone to cache the result.  There's no point in having it hanging
1591                 # around uninitialized in every Title object; therefore we only add it
1592                 # if needed and don't declare it statically.
1593                 if( isset( $this->mHasSubpages ) ) {
1594                         return $this->mHasSubpages;
1595                 }
1596
1597                 $db = wfGetDB( DB_SLAVE );
1598                 return $this->mHasSubpages = (bool)$db->selectField( 'page', '1',
1599                         "page_namespace = {$this->mNamespace} AND page_title LIKE '"
1600                         . $db->escapeLike( $this->mDbkeyform ) . "/%'",
1601                         __METHOD__
1602                 );
1603         }
1604
1605         /**
1606          * Could this page contain custom CSS or JavaScript, based
1607          * on the title?
1608          *
1609          * @return \type{\bool} TRUE or FALSE
1610          */
1611         public function isCssOrJsPage() {
1612                 return $this->mNamespace == NS_MEDIAWIKI
1613                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1614         }
1615
1616         /**
1617          * Is this a .css or .js subpage of a user page?
1618          * @return \type{\bool} TRUE or FALSE
1619          */
1620         public function isCssJsSubpage() {
1621                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1622         }
1623         /**
1624          * Is this a *valid* .css or .js subpage of a user page?
1625          * Check that the corresponding skin exists
1626          * @return \type{\bool} TRUE or FALSE
1627          */
1628         public function isValidCssJsSubpage() {
1629                 if ( $this->isCssJsSubpage() ) {
1630                         $skinNames = Skin::getSkinNames();
1631                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1632                 } else {
1633                         return false;
1634                 }
1635         }
1636         /**
1637          * Trim down a .css or .js subpage title to get the corresponding skin name
1638          */
1639         public function getSkinFromCssJsSubpage() {
1640                 $subpage = explode( '/', $this->mTextform );
1641                 $subpage = $subpage[ count( $subpage ) - 1 ];
1642                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1643         }
1644         /**
1645          * Is this a .css subpage of a user page?
1646          * @return \type{\bool} TRUE or FALSE
1647          */
1648         public function isCssSubpage() {
1649                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1650         }
1651         /**
1652          * Is this a .js subpage of a user page?
1653          * @return \type{\bool} TRUE or FALSE
1654          */
1655         public function isJsSubpage() {
1656                 return ( NS_USER == $this->mNamespace && preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1657         }
1658         /**
1659          * Protect css/js subpages of user pages: can $wgUser edit
1660          * this page?
1661          *
1662          * @return \type{\bool} TRUE or FALSE
1663          * @todo XXX: this might be better using restrictions
1664          */
1665         public function userCanEditCssJsSubpage() {
1666                 global $wgUser;
1667                 return ( $wgUser->isAllowed('editusercssjs') || preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1668         }
1669
1670         /**
1671          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1672          *
1673          * @return \type{\bool} If the page is subject to cascading restrictions.
1674          */
1675         public function isCascadeProtected() {
1676                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
1677                 return ( $sources > 0 );
1678         }
1679
1680         /**
1681          * Cascading protection: Get the source of any cascading restrictions on this page.
1682          *
1683          * @param $get_pages \type{\bool} Whether or not to retrieve the actual pages that the restrictions have come from.
1684          * @return \type{\arrayof{mixed title array, restriction array}} Array of the Title objects of the pages from
1685          *         which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1686          *         The restriction array is an array of each type, each of which contains an array of unique groups.
1687          */
1688         public function getCascadeProtectionSources( $get_pages = true ) {
1689                 global $wgRestrictionTypes;
1690
1691                 # Define our dimension of restrictions types
1692                 $pagerestrictions = array();
1693                 foreach( $wgRestrictionTypes as $action )
1694                         $pagerestrictions[$action] = array();
1695
1696                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1697                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1698                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1699                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1700                 }
1701
1702                 wfProfileIn( __METHOD__ );
1703
1704                 $dbr = wfGetDB( DB_SLAVE );
1705
1706                 if ( $this->getNamespace() == NS_FILE ) {
1707                         $tables = array ('imagelinks', 'page_restrictions');
1708                         $where_clauses = array(
1709                                 'il_to' => $this->getDBkey(),
1710                                 'il_from=pr_page',
1711                                 'pr_cascade' => 1 );
1712                 } else {
1713                         $tables = array ('templatelinks', 'page_restrictions');
1714                         $where_clauses = array(
1715                                 'tl_namespace' => $this->getNamespace(),
1716                                 'tl_title' => $this->getDBkey(),
1717                                 'tl_from=pr_page',
1718                                 'pr_cascade' => 1 );
1719                 }
1720
1721                 if ( $get_pages ) {
1722                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1723                         $where_clauses[] = 'page_id=pr_page';
1724                         $tables[] = 'page';
1725                 } else {
1726                         $cols = array( 'pr_expiry' );
1727                 }
1728
1729                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1730
1731                 $sources = $get_pages ? array() : false;
1732                 $now = wfTimestampNow();
1733                 $purgeExpired = false;
1734
1735                 foreach( $res as $row ) {
1736                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1737                         if( $expiry > $now ) {
1738                                 if ($get_pages) {
1739                                         $page_id = $row->pr_page;
1740                                         $page_ns = $row->page_namespace;
1741                                         $page_title = $row->page_title;
1742                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1743                                         # Add groups needed for each restriction type if its not already there
1744                                         # Make sure this restriction type still exists
1745                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1746                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1747                                         }
1748                                 } else {
1749                                         $sources = true;
1750                                 }
1751                         } else {
1752                                 // Trigger lazy purge of expired restrictions from the db
1753                                 $purgeExpired = true;
1754                         }
1755                 }
1756                 if( $purgeExpired ) {
1757                         Title::purgeExpiredRestrictions();
1758                 }
1759
1760                 wfProfileOut( __METHOD__ );
1761
1762                 if ( $get_pages ) {
1763                         $this->mCascadeSources = $sources;
1764                         $this->mCascadingRestrictions = $pagerestrictions;
1765                 } else {
1766                         $this->mHasCascadingRestrictions = $sources;
1767                 }
1768                 return array( $sources, $pagerestrictions );
1769         }
1770
1771         function areRestrictionsCascading() {
1772                 if (!$this->mRestrictionsLoaded) {
1773                         $this->loadRestrictions();
1774                 }
1775
1776                 return $this->mCascadeRestriction;
1777         }
1778
1779         /**
1780          * Loads a string into mRestrictions array
1781          * @param $res \type{Resource} restrictions as an SQL result.
1782          */
1783         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1784                 global $wgRestrictionTypes;
1785                 $dbr = wfGetDB( DB_SLAVE );
1786
1787                 foreach( $wgRestrictionTypes as $type ){
1788                         $this->mRestrictions[$type] = array();
1789                         $this->mRestrictionsExpiry[$type] = Block::decodeExpiry('');
1790                 }
1791
1792                 $this->mCascadeRestriction = false;
1793
1794                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1795
1796                 if ( $oldFashionedRestrictions === NULL ) {
1797                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
1798                                 array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1799                 }
1800
1801                 if ($oldFashionedRestrictions != '') {
1802
1803                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1804                                 $temp = explode( '=', trim( $restrict ) );
1805                                 if(count($temp) == 1) {
1806                                         // old old format should be treated as edit/move restriction
1807                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
1808                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
1809                                 } else {
1810                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1811                                 }
1812                         }
1813
1814                         $this->mOldRestrictions = true;
1815
1816                 }
1817
1818                 if( $dbr->numRows( $res ) ) {
1819                         # Current system - load second to make them override.
1820                         $now = wfTimestampNow();
1821                         $purgeExpired = false;
1822
1823                         foreach( $res as $row ) {
1824                                 # Cycle through all the restrictions.
1825
1826                                 // Don't take care of restrictions types that aren't in $wgRestrictionTypes
1827                                 if( !in_array( $row->pr_type, $wgRestrictionTypes ) )
1828                                         continue;
1829
1830                                 // This code should be refactored, now that it's being used more generally,
1831                                 // But I don't really see any harm in leaving it in Block for now -werdna
1832                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1833
1834                                 // Only apply the restrictions if they haven't expired!
1835                                 if ( !$expiry || $expiry > $now ) {
1836                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
1837                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1838
1839                                         $this->mCascadeRestriction |= $row->pr_cascade;
1840                                 } else {
1841                                         // Trigger a lazy purge of expired restrictions
1842                                         $purgeExpired = true;
1843                                 }
1844                         }
1845
1846                         if( $purgeExpired ) {
1847                                 Title::purgeExpiredRestrictions();
1848                         }
1849                 }
1850
1851                 $this->mRestrictionsLoaded = true;
1852         }
1853
1854         /**
1855          * Load restrictions from the page_restrictions table
1856          */
1857         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1858                 if( !$this->mRestrictionsLoaded ) {
1859                         if ($this->exists()) {
1860                                 $dbr = wfGetDB( DB_SLAVE );
1861
1862                                 $res = $dbr->select( 'page_restrictions', '*',
1863                                         array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1864
1865                                 $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1866                         } else {
1867                                 $title_protection = $this->getTitleProtection();
1868
1869                                 if (is_array($title_protection)) {
1870                                         extract($title_protection);
1871
1872                                         $now = wfTimestampNow();
1873                                         $expiry = Block::decodeExpiry($pt_expiry);
1874
1875                                         if (!$expiry || $expiry > $now) {
1876                                                 // Apply the restrictions
1877                                                 $this->mRestrictionsExpiry['create'] = $expiry;
1878                                                 $this->mRestrictions['create'] = explode(',', trim($pt_create_perm) );
1879                                         } else { // Get rid of the old restrictions
1880                                                 Title::purgeExpiredRestrictions();
1881                                         }
1882                                 } else {
1883                                         $this->mRestrictionsExpiry['create'] = Block::decodeExpiry('');
1884                                 }
1885                                 $this->mRestrictionsLoaded = true;
1886                         }
1887                 }
1888         }
1889
1890         /**
1891          * Purge expired restrictions from the page_restrictions table
1892          */
1893         static function purgeExpiredRestrictions() {
1894                 $dbw = wfGetDB( DB_MASTER );
1895                 $dbw->delete( 'page_restrictions',
1896                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1897                         __METHOD__ );
1898
1899                 $dbw->delete( 'protected_titles',
1900                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1901                         __METHOD__ );
1902         }
1903
1904         /**
1905          * Accessor/initialisation for mRestrictions
1906          *
1907          * @param $action \type{\string} action that permission needs to be checked for
1908          * @return \type{\arrayof{\string}} the array of groups allowed to edit this article
1909          */
1910         public function getRestrictions( $action ) {
1911                 if( !$this->mRestrictionsLoaded ) {
1912                         $this->loadRestrictions();
1913                 }
1914                 return isset( $this->mRestrictions[$action] )
1915                                 ? $this->mRestrictions[$action]
1916                                 : array();
1917         }
1918
1919         /**
1920          * Get the expiry time for the restriction against a given action
1921          * @return 14-char timestamp, or 'infinity' if the page is protected forever
1922          * or not protected at all, or false if the action is not recognised.
1923          */
1924         public function getRestrictionExpiry( $action ) {
1925                 if( !$this->mRestrictionsLoaded ) {
1926                         $this->loadRestrictions();
1927                 }
1928                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
1929         }
1930
1931         /**
1932          * Is there a version of this page in the deletion archive?
1933          * @return \type{\int} the number of archived revisions
1934          */
1935         public function isDeleted() {
1936                 $fname = 'Title::isDeleted';
1937                 if ( $this->getNamespace() < 0 ) {
1938                         $n = 0;
1939                 } else {
1940                         $dbr = wfGetDB( DB_SLAVE );
1941                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1942                                 'ar_title' => $this->getDBkey() ), $fname );
1943                         if( $this->getNamespace() == NS_FILE ) {
1944                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1945                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1946                         }
1947                 }
1948                 return (int)$n;
1949         }
1950
1951         /**
1952          * Get the article ID for this Title from the link cache,
1953          * adding it if necessary
1954          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select
1955          *      for update
1956          * @return \type{\int} the ID
1957          */
1958         public function getArticleID( $flags = 0 ) {
1959                 if( $this->getNamespace() < 0 ) {
1960                         return $this->mArticleID = 0;
1961                 }
1962                 $linkCache = LinkCache::singleton();
1963                 if( $flags & GAID_FOR_UPDATE ) {
1964                         $oldUpdate = $linkCache->forUpdate( true );
1965                         $linkCache->clearLink( $this );
1966                         $this->mArticleID = $linkCache->addLinkObj( $this );
1967                         $linkCache->forUpdate( $oldUpdate );
1968                 } else {
1969                         if( -1 == $this->mArticleID ) {
1970                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1971                         }
1972                 }
1973                 return $this->mArticleID;
1974         }
1975
1976         /**
1977          * Is this an article that is a redirect page?
1978          * Uses link cache, adding it if necessary
1979          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1980          * @return \type{\bool}
1981          */
1982         public function isRedirect( $flags = 0 ) {
1983                 if( !is_null($this->mRedirect) )
1984                         return $this->mRedirect;
1985                 # Calling getArticleID() loads the field from cache as needed
1986                 if( !$this->getArticleID($flags) ) {
1987                         return $this->mRedirect = false;
1988                 }
1989                 $linkCache = LinkCache::singleton();
1990                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
1991
1992                 return $this->mRedirect;
1993         }
1994
1995         /**
1996          * What is the length of this page?
1997          * Uses link cache, adding it if necessary
1998          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
1999          * @return \type{\bool}
2000          */
2001         public function getLength( $flags = 0 ) {
2002                 if( $this->mLength != -1 )
2003                         return $this->mLength;
2004                 # Calling getArticleID() loads the field from cache as needed
2005                 if( !$this->getArticleID($flags) ) {
2006                         return $this->mLength = 0;
2007                 }
2008                 $linkCache = LinkCache::singleton();
2009                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2010
2011                 return $this->mLength;
2012         }
2013
2014         /**
2015          * What is the page_latest field for this page?
2016          * @param $flags \type{\int} a bit field; may be GAID_FOR_UPDATE to select for update
2017          * @return \type{\int}
2018          */
2019         public function getLatestRevID( $flags = 0 ) {
2020                 if( $this->mLatestID !== false )
2021                         return $this->mLatestID;
2022
2023                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB(DB_MASTER) : wfGetDB(DB_SLAVE);
2024                 $this->mLatestID = $db->selectField( 'page', 'page_latest', $this->pageCond(), __METHOD__ );
2025                 return $this->mLatestID;
2026         }
2027
2028         /**
2029          * This clears some fields in this object, and clears any associated
2030          * keys in the "bad links" section of the link cache.
2031          *
2032          * - This is called from Article::insertNewArticle() to allow
2033          * loading of the new page_id. It's also called from
2034          * Article::doDeleteArticle()
2035          *
2036          * @param $newid \type{\int} the new Article ID
2037          */
2038         public function resetArticleID( $newid ) {
2039                 $linkCache = LinkCache::singleton();
2040                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
2041
2042                 if ( 0 == $newid ) { $this->mArticleID = -1; }
2043                 else { $this->mArticleID = $newid; }
2044                 $this->mRestrictionsLoaded = false;
2045                 $this->mRestrictions = array();
2046         }
2047
2048         /**
2049          * Updates page_touched for this page; called from LinksUpdate.php
2050          * @return \type{\bool} true if the update succeded
2051          */
2052         public function invalidateCache() {
2053                 if( wfReadOnly() ) {
2054                         return;
2055                 }
2056                 $dbw = wfGetDB( DB_MASTER );
2057                 $success = $dbw->update( 'page',
2058                         array( 'page_touched' => $dbw->timestamp() ),
2059                         $this->pageCond(),
2060                         __METHOD__
2061                 );
2062                 HTMLFileCache::clearFileCache( $this );
2063                 return $success;
2064         }
2065
2066         /**
2067          * Prefix some arbitrary text with the namespace or interwiki prefix
2068          * of this object
2069          *
2070          * @param $name \type{\string} the text
2071          * @return \type{\string} the prefixed text
2072          * @private
2073          */
2074         /* private */ function prefix( $name ) {
2075                 $p = '';
2076                 if ( '' != $this->mInterwiki ) {
2077                         $p = $this->mInterwiki . ':';
2078                 }
2079                 if ( 0 != $this->mNamespace ) {
2080                         $p .= $this->getNsText() . ':';
2081                 }
2082                 return $p . $name;
2083         }
2084
2085         /**
2086          * Secure and split - main initialisation function for this object
2087          *
2088          * Assumes that mDbkeyform has been set, and is urldecoded
2089          * and uses underscores, but not otherwise munged.  This function
2090          * removes illegal characters, splits off the interwiki and
2091          * namespace prefixes, sets the other forms, and canonicalizes
2092          * everything.
2093          * @return \type{\bool} true on success
2094          */
2095         private function secureAndSplit() {
2096                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
2097
2098                 # Initialisation
2099                 static $rxTc = false;
2100                 if( !$rxTc ) {
2101                         # Matching titles will be held as illegal.
2102                         $rxTc = '/' .
2103                                 # Any character not allowed is forbidden...
2104                                 '[^' . Title::legalChars() . ']' .
2105                                 # URL percent encoding sequences interfere with the ability
2106                                 # to round-trip titles -- you can't link to them consistently.
2107                                 '|%[0-9A-Fa-f]{2}' .
2108                                 # XML/HTML character references produce similar issues.
2109                                 '|&[A-Za-z0-9\x80-\xff]+;' .
2110                                 '|&#[0-9]+;' .
2111                                 '|&#x[0-9A-Fa-f]+;' .
2112                                 '/S';
2113                 }
2114
2115                 $this->mInterwiki = $this->mFragment = '';
2116                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2117
2118                 $dbkey = $this->mDbkeyform;
2119
2120                 # Strip Unicode bidi override characters.
2121                 # Sometimes they slip into cut-n-pasted page titles, where the
2122                 # override chars get included in list displays.
2123                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2124
2125                 # Clean up whitespace
2126                 #
2127                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
2128                 $dbkey = trim( $dbkey, '_' );
2129
2130                 if ( '' == $dbkey ) {
2131                         return false;
2132                 }
2133
2134                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2135                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2136                         return false;
2137                 }
2138
2139                 $this->mDbkeyform = $dbkey;
2140
2141                 # Initial colon indicates main namespace rather than specified default
2142                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2143                 if ( ':' == $dbkey{0} ) {
2144                         $this->mNamespace = NS_MAIN;
2145                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2146                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2147                 }
2148
2149                 # Namespace or interwiki prefix
2150                 $firstPass = true;
2151                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2152                 do {
2153                         $m = array();
2154                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2155                                 $p = $m[1];
2156                                 if ( $ns = $wgContLang->getNsIndex( $p ) ) {
2157                                         # Ordinary namespace
2158                                         $dbkey = $m[2];
2159                                         $this->mNamespace = $ns;
2160                                         # For Talk:X pages, check if X has a "namespace" prefix
2161                                         if( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2162                                                 if( $wgContLang->getNsIndex( $x[1] ) )
2163                                                         return false; # Disallow Talk:File:x type titles...
2164                                                 else if( Interwiki::isValidInterwiki( $x[1] ) )
2165                                                         return false; # Disallow Talk:Interwiki:x type titles...
2166                                         }
2167                                 } elseif( Interwiki::isValidInterwiki( $p ) ) {
2168                                         if( !$firstPass ) {
2169                                                 # Can't make a local interwiki link to an interwiki link.
2170                                                 # That's just crazy!
2171                                                 return false;
2172                                         }
2173
2174                                         # Interwiki link
2175                                         $dbkey = $m[2];
2176                                         $this->mInterwiki = $wgContLang->lc( $p );
2177
2178                                         # Redundant interwiki prefix to the local wiki
2179                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
2180                                                 if( $dbkey == '' ) {
2181                                                         # Can't have an empty self-link
2182                                                         return false;
2183                                                 }
2184                                                 $this->mInterwiki = '';
2185                                                 $firstPass = false;
2186                                                 # Do another namespace split...
2187                                                 continue;
2188                                         }
2189
2190                                         # If there's an initial colon after the interwiki, that also
2191                                         # resets the default namespace
2192                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
2193                                                 $this->mNamespace = NS_MAIN;
2194                                                 $dbkey = substr( $dbkey, 1 );
2195                                         }
2196                                 }
2197                                 # If there's no recognized interwiki or namespace,
2198                                 # then let the colon expression be part of the title.
2199                         }
2200                         break;
2201                 } while( true );
2202
2203                 # We already know that some pages won't be in the database!
2204                 #
2205                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
2206                         $this->mArticleID = 0;
2207                 }
2208                 $fragment = strstr( $dbkey, '#' );
2209                 if ( false !== $fragment ) {
2210                         $this->setFragment( $fragment );
2211                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
2212                         # remove whitespace again: prevents "Foo_bar_#"
2213                         # becoming "Foo_bar_"
2214                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
2215                 }
2216
2217                 # Reject illegal characters.
2218                 #
2219                 if( preg_match( $rxTc, $dbkey ) ) {
2220                         return false;
2221                 }
2222
2223                 /**
2224                  * Pages with "/./" or "/../" appearing in the URLs will often be un-
2225                  * reachable due to the way web browsers deal with 'relative' URLs.
2226                  * Also, they conflict with subpage syntax.  Forbid them explicitly.
2227                  */
2228                 if ( strpos( $dbkey, '.' ) !== false &&
2229                      ( $dbkey === '.' || $dbkey === '..' ||
2230                        strpos( $dbkey, './' ) === 0  ||
2231                        strpos( $dbkey, '../' ) === 0 ||
2232                        strpos( $dbkey, '/./' ) !== false ||
2233                        strpos( $dbkey, '/../' ) !== false  ||
2234                        substr( $dbkey, -2 ) == '/.' ||
2235                        substr( $dbkey, -3 ) == '/..' ) )
2236                 {
2237                         return false;
2238                 }
2239
2240                 /**
2241                  * Magic tilde sequences? Nu-uh!
2242                  */
2243                 if( strpos( $dbkey, '~~~' ) !== false ) {
2244                         return false;
2245                 }
2246
2247                 /**
2248                  * Limit the size of titles to 255 bytes.
2249                  * This is typically the size of the underlying database field.
2250                  * We make an exception for special pages, which don't need to be stored
2251                  * in the database, and may edge over 255 bytes due to subpage syntax
2252                  * for long titles, e.g. [[Special:Block/Long name]]
2253                  */
2254                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
2255                   strlen( $dbkey ) > 512 )
2256                 {
2257                         return false;
2258                 }
2259
2260                 /**
2261                  * Normally, all wiki links are forced to have
2262                  * an initial capital letter so [[foo]] and [[Foo]]
2263                  * point to the same place.
2264                  *
2265                  * Don't force it for interwikis, since the other
2266                  * site might be case-sensitive.
2267                  */
2268                 $this->mUserCaseDBKey = $dbkey;
2269                 if( $wgCapitalLinks && $this->mInterwiki == '') {
2270                         $dbkey = $wgContLang->ucfirst( $dbkey );
2271                 }
2272
2273                 /**
2274                  * Can't make a link to a namespace alone...
2275                  * "empty" local links can only be self-links
2276                  * with a fragment identifier.
2277                  */
2278                 if( $dbkey == '' &&
2279                         $this->mInterwiki == '' &&
2280                         $this->mNamespace != NS_MAIN ) {
2281                         return false;
2282                 }
2283                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
2284                 // IP names are not allowed for accounts, and can only be referring to
2285                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
2286                 // there are numerous ways to present the same IP. Having sp:contribs scan
2287                 // them all is silly and having some show the edits and others not is
2288                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
2289                 $dbkey = ($this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK) ?
2290                         IP::sanitizeIP( $dbkey ) : $dbkey;
2291                 // Any remaining initial :s are illegal.
2292                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
2293                         return false;
2294                 }
2295
2296                 # Fill fields
2297                 $this->mDbkeyform = $dbkey;
2298                 $this->mUrlform = wfUrlencode( $dbkey );
2299
2300                 $this->mTextform = str_replace( '_', ' ', $dbkey );
2301
2302                 return true;
2303         }
2304
2305         /**
2306          * Set the fragment for this title. Removes the first character from the
2307          * specified fragment before setting, so it assumes you're passing it with
2308          * an initial "#".
2309          *
2310          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
2311          * Still in active use privately.
2312          *
2313          * @param $fragment \type{\string} text
2314          */
2315         public function setFragment( $fragment ) {
2316                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
2317         }
2318
2319         /**
2320          * Get a Title object associated with the talk page of this article
2321          * @return \type{Title} the object for the talk page
2322          */
2323         public function getTalkPage() {
2324                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
2325         }
2326
2327         /**
2328          * Get a title object associated with the subject page of this
2329          * talk page
2330          *
2331          * @return \type{Title} the object for the subject page
2332          */
2333         public function getSubjectPage() {
2334                 // Is this the same title?
2335                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
2336                 if( $this->getNamespace() == $subjectNS ) {
2337                         return $this;
2338                 }
2339                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
2340         }
2341
2342         /**
2343          * Get an array of Title objects linking to this Title
2344          * Also stores the IDs in the link cache.
2345          *
2346          * WARNING: do not use this function on arbitrary user-supplied titles!
2347          * On heavily-used templates it will max out the memory.
2348          *
2349          * @param $options \type{\string} may be FOR UPDATE
2350          * @return \type{\arrayof{Title}} the Title objects linking here
2351          */
2352         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
2353                 $linkCache = LinkCache::singleton();
2354
2355                 if ( $options ) {
2356                         $db = wfGetDB( DB_MASTER );
2357                 } else {
2358                         $db = wfGetDB( DB_SLAVE );
2359                 }
2360
2361                 $res = $db->select( array( 'page', $table ),
2362                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
2363                         array(
2364                                 "{$prefix}_from=page_id",
2365                                 "{$prefix}_namespace" => $this->getNamespace(),
2366                                 "{$prefix}_title"     => $this->getDBkey() ),
2367                         __METHOD__,
2368                         $options );
2369
2370                 $retVal = array();
2371                 if ( $db->numRows( $res ) ) {
2372                         foreach( $res as $row ) {
2373                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
2374                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
2375                                         $retVal[] = $titleObj;
2376                                 }
2377                         }
2378                 }
2379                 $db->freeResult( $res );
2380                 return $retVal;
2381         }
2382
2383         /**
2384          * Get an array of Title objects using this Title as a template
2385          * Also stores the IDs in the link cache.
2386          *
2387          * WARNING: do not use this function on arbitrary user-supplied titles!
2388          * On heavily-used templates it will max out the memory.
2389          *
2390          * @param $options \type{\string} may be FOR UPDATE
2391          * @return \type{\arrayof{Title}} the Title objects linking here
2392          */
2393         public function getTemplateLinksTo( $options = '' ) {
2394                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2395         }
2396
2397         /**
2398          * Get an array of Title objects referring to non-existent articles linked from this page
2399          *
2400          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
2401          * @param $options \type{\string} may be FOR UPDATE
2402          * @return \type{\arrayof{Title}} the Title objects
2403          */
2404         public function getBrokenLinksFrom( $options = '' ) {
2405                 if ( $this->getArticleId() == 0 ) {
2406                         # All links from article ID 0 are false positives
2407                         return array();
2408                 }
2409
2410                 if ( $options ) {
2411                         $db = wfGetDB( DB_MASTER );
2412                 } else {
2413                         $db = wfGetDB( DB_SLAVE );
2414                 }
2415
2416                 $res = $db->safeQuery(
2417                           "SELECT pl_namespace, pl_title
2418                              FROM !
2419                         LEFT JOIN !
2420                                ON pl_namespace=page_namespace
2421                               AND pl_title=page_title
2422                             WHERE pl_from=?
2423                               AND page_namespace IS NULL
2424                                   !",
2425                         $db->tableName( 'pagelinks' ),
2426                         $db->tableName( 'page' ),
2427                         $this->getArticleId(),
2428                         $options );
2429
2430                 $retVal = array();
2431                 if ( $db->numRows( $res ) ) {
2432                         foreach( $res as $row ) {
2433                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2434                         }
2435                 }
2436                 $db->freeResult( $res );
2437                 return $retVal;
2438         }
2439
2440
2441         /**
2442          * Get a list of URLs to purge from the Squid cache when this
2443          * page changes
2444          *
2445          * @return \type{\arrayof{\string}} the URLs
2446          */
2447         public function getSquidURLs() {
2448                 global $wgContLang;
2449
2450                 $urls = array(
2451                         $this->getInternalURL(),
2452                         $this->getInternalURL( 'action=history' )
2453                 );
2454
2455                 // purge variant urls as well
2456                 if($wgContLang->hasVariants()){
2457                         $variants = $wgContLang->getVariants();
2458                         foreach($variants as $vCode){
2459                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2460                                 $urls[] = $this->getInternalURL('',$vCode);
2461                         }
2462                 }
2463
2464                 return $urls;
2465         }
2466
2467         /**
2468          * Purge all applicable Squid URLs
2469          */
2470         public function purgeSquid() {
2471                 global $wgUseSquid;
2472                 if ( $wgUseSquid ) {
2473                         $urls = $this->getSquidURLs();
2474                         $u = new SquidUpdate( $urls );
2475                         $u->doUpdate();
2476                 }
2477         }
2478
2479         /**
2480          * Move this page without authentication
2481          * @param &$nt \type{Title} the new page Title
2482          */
2483         public function moveNoAuth( &$nt ) {
2484                 return $this->moveTo( $nt, false );
2485         }
2486
2487         /**
2488          * Check whether a given move operation would be valid.
2489          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
2490          * @param &$nt \type{Title} the new title
2491          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2492          *      should be checked
2493          * @param $reason \type{\string} is the log summary of the move, used for spam checking
2494          * @return \type{\mixed} True on success, getUserPermissionsErrors()-like array on failure
2495          */
2496         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
2497                 global $wgUser;
2498
2499                 $errors = array();
2500                 if( !$nt ) {
2501                         // Normally we'd add this to $errors, but we'll get
2502                         // lots of syntax errors if $nt is not an object
2503                         return array(array('badtitletext'));
2504                 }
2505                 if( $this->equals( $nt ) ) {
2506                         $errors[] = array('selfmove');
2507                 }
2508                 if( !$this->isMovable() ) {
2509                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
2510                 }
2511                 if ( $nt->getInterwiki() != '' ) {
2512                         $errors[] = array( 'immobile-target-namespace-iw' );
2513                 }
2514                 if ( !$nt->isMovable() ) {
2515                         $errors[] = array('immobile-target-namespace', $nt->getNsText() );
2516                 }
2517
2518                 $oldid = $this->getArticleID();
2519                 $newid = $nt->getArticleID();
2520
2521                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2522                         $errors[] = array('articleexists');
2523                 }
2524                 if ( ( '' == $this->getDBkey() ) ||
2525                          ( !$oldid ) ||
2526                      ( '' == $nt->getDBkey() ) ) {
2527                         $errors[] = array('badarticleerror');
2528                 }
2529
2530                 // Image-specific checks
2531                 if( $this->getNamespace() == NS_FILE ) {
2532                         $file = wfLocalFile( $this );
2533                         if( $file->exists() ) {
2534                                 if( $nt->getNamespace() != NS_FILE ) {
2535                                         $errors[] = array('imagenocrossnamespace');
2536                                 }
2537                                 if( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
2538                                         $errors[] = array('imageinvalidfilename');
2539                                 }
2540                                 if( !File::checkExtensionCompatibility( $file, $nt->getDBKey() ) ) {
2541                                         $errors[] = array('imagetypemismatch');
2542                                 }
2543                         }
2544                 }
2545
2546                 if ( $auth ) {
2547                         $errors = wfMergeErrorArrays( $errors,
2548                                 $this->getUserPermissionsErrors('move', $wgUser),
2549                                 $this->getUserPermissionsErrors('edit', $wgUser),
2550                                 $nt->getUserPermissionsErrors('move-target', $wgUser),
2551                                 $nt->getUserPermissionsErrors('edit', $wgUser) );
2552                 }
2553
2554                 $match = EditPage::matchSpamRegex( $reason );
2555                 if( $match !== false ) {
2556                         // This is kind of lame, won't display nice
2557                         $errors[] = array('spamprotectiontext');
2558                 }
2559
2560                 $err = null;
2561                 if( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
2562                         $errors[] = array('hookaborted', $err);
2563                 }
2564
2565                 # The move is allowed only if (1) the target doesn't exist, or
2566                 # (2) the target is a redirect to the source, and has no history
2567                 # (so we can undo bad moves right after they're done).
2568
2569                 if ( 0 != $newid ) { # Target exists; check for validity
2570                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2571                                 $errors[] = array('articleexists');
2572                         }
2573                 } else {
2574                         $tp = $nt->getTitleProtection();
2575                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
2576                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
2577                                 $errors[] = array('cantmove-titleprotected');
2578                         }
2579                 }
2580                 if(empty($errors))
2581                         return true;
2582                 return $errors;
2583         }
2584
2585         /**
2586          * Move a title to a new location
2587          * @param &$nt \type{Title} the new title
2588          * @param $auth \type{\bool} indicates whether $wgUser's permissions
2589          *      should be checked
2590          * @param $reason \type{\string} The reason for the move
2591          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title.
2592          *  Ignored if the user doesn't have the suppressredirect right.
2593          * @return \type{\mixed} true on success, getUserPermissionsErrors()-like array on failure
2594          */
2595         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
2596                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
2597                 if( is_array( $err ) ) {
2598                         return $err;
2599                 }
2600
2601                 $pageid = $this->getArticleID();
2602                 $protected = $this->isProtected();
2603                 if( $nt->exists() ) {
2604                         $err = $this->moveOverExistingRedirect( $nt, $reason, $createRedirect );
2605                         $pageCountChange = ($createRedirect ? 0 : -1);
2606                 } else { # Target didn't exist, do normal move.
2607                         $err = $this->moveToNewTitle( $nt, $reason, $createRedirect );
2608                         $pageCountChange = ($createRedirect ? 1 : 0);
2609                 }
2610
2611                 if( is_array( $err ) ) {
2612                         return $err;
2613                 }
2614                 $redirid = $this->getArticleID();
2615
2616                 // Category memberships include a sort key which may be customized.
2617                 // If it's left as the default (the page title), we need to update
2618                 // the sort key to match the new title.
2619                 //
2620                 // Be careful to avoid resetting cl_timestamp, which may disturb
2621                 // time-based lists on some sites.
2622                 //
2623                 // Warning -- if the sort key is *explicitly* set to the old title,
2624                 // we can't actually distinguish it from a default here, and it'll
2625                 // be set to the new title even though it really shouldn't.
2626                 // It'll get corrected on the next edit, but resetting cl_timestamp.
2627                 $dbw = wfGetDB( DB_MASTER );
2628                 $dbw->update( 'categorylinks',
2629                         array(
2630                                 'cl_sortkey' => $nt->getPrefixedText(),
2631                                 'cl_timestamp=cl_timestamp' ),
2632                         array(
2633                                 'cl_from' => $pageid,
2634                                 'cl_sortkey' => $this->getPrefixedText() ),
2635                         __METHOD__ );
2636
2637                 if( $protected ) {
2638                         # Protect the redirect title as the title used to be...
2639                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
2640                                 array(
2641                                         'pr_page'    => $redirid,
2642                                         'pr_type'    => 'pr_type',
2643                                         'pr_level'   => 'pr_level',
2644                                         'pr_cascade' => 'pr_cascade',
2645                                         'pr_user'    => 'pr_user',
2646                                         'pr_expiry'  => 'pr_expiry'
2647                                 ),
2648                                 array( 'pr_page' => $pageid ),
2649                                 __METHOD__,
2650                                 array( 'IGNORE' )
2651                         );
2652                         # Update the protection log
2653                         $log = new LogPage( 'protect' );
2654                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2655                         if( $reason ) $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
2656                         $log->addEntry( 'move_prot', $nt, $comment, array($this->getPrefixedText()) ); // FIXME: $params?
2657                 }
2658
2659                 # Update watchlists
2660                 $oldnamespace = $this->getNamespace() & ~1;
2661                 $newnamespace = $nt->getNamespace() & ~1;
2662                 $oldtitle = $this->getDBkey();
2663                 $newtitle = $nt->getDBkey();
2664
2665                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2666                         WatchedItem::duplicateEntries( $this, $nt );
2667                 }
2668
2669                 # Update search engine
2670                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2671                 $u->doUpdate();
2672                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2673                 $u->doUpdate();
2674
2675                 # Update site_stats
2676                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2677                         # No longer a content page
2678                         # Not viewed, edited, removing
2679                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2680                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2681                         # Now a content page
2682                         # Not viewed, edited, adding
2683                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2684                 } elseif( $pageCountChange ) {
2685                         # Redirect added
2686                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2687                 } else {
2688                         # Nothing special
2689                         $u = false;
2690                 }
2691                 if( $u )
2692                         $u->doUpdate();
2693                 # Update message cache for interface messages
2694                 if( $nt->getNamespace() == NS_MEDIAWIKI ) {
2695                         global $wgMessageCache;
2696                         $oldarticle = new Article( $this );
2697                         $wgMessageCache->replace( $this->getDBkey(), $oldarticle->getContent() );
2698                         $newarticle = new Article( $nt );
2699                         $wgMessageCache->replace( $nt->getDBkey(), $newarticle->getContent() );
2700                 }
2701
2702                 global $wgUser;
2703                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2704                 return true;
2705         }
2706
2707         /**
2708          * Move page to a title which is at present a redirect to the
2709          * source page
2710          *
2711          * @param &$nt \type{Title} the page to move to, which should currently
2712          *      be a redirect
2713          * @param $reason \type{\string} The reason for the move
2714          * @param $createRedirect \type{\bool} Whether to leave a redirect at the old title.
2715          *  Ignored if the user doesn't have the suppressredirect right
2716          */
2717         private function moveOverExistingRedirect( &$nt, $reason = '', $createRedirect = true ) {
2718                 global $wgUseSquid, $wgUser;
2719                 $fname = 'Title::moveOverExistingRedirect';
2720                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2721
2722                 if ( $reason ) {
2723                         $comment .= ": $reason";
2724                 }
2725
2726                 $now = wfTimestampNow();
2727                 $newid = $nt->getArticleID();
2728                 $oldid = $this->getArticleID();
2729                 $latest = $this->getLatestRevID();
2730
2731                 $dbw = wfGetDB( DB_MASTER );
2732
2733                 # Delete the old redirect. We don't save it to history since
2734                 # by definition if we've got here it's rather uninteresting.
2735                 # We have to remove it so that the next step doesn't trigger
2736                 # a conflict on the unique namespace+title index...
2737                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2738                 if ( !$dbw->cascadingDeletes() ) {
2739                         $dbw->delete( 'revision', array( 'rev_page' => $newid ), __METHOD__ );
2740                         global $wgUseTrackbacks;
2741                         if ($wgUseTrackbacks)
2742                                 $dbw->delete( 'trackbacks', array( 'tb_page' => $newid ), __METHOD__ );
2743                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), __METHOD__ );
2744                         $dbw->delete( 'imagelinks', array( 'il_from' => $newid ), __METHOD__ );
2745                         $dbw->delete( 'categorylinks', array( 'cl_from' => $newid ), __METHOD__ );
2746                         $dbw->delete( 'templatelinks', array( 'tl_from' => $newid ), __METHOD__ );
2747                         $dbw->delete( 'externallinks', array( 'el_from' => $newid ), __METHOD__ );
2748                         $dbw->delete( 'langlinks', array( 'll_from' => $newid ), __METHOD__ );
2749                         $dbw->delete( 'redirect', array( 'rd_from' => $newid ), __METHOD__ );
2750                 }
2751
2752                 # Save a null revision in the page's history notifying of the move
2753                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2754                 $nullRevId = $nullRevision->insertOn( $dbw );
2755
2756                 $article = new Article( $this );
2757                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2758
2759                 # Change the name of the target page:
2760                 $dbw->update( 'page',
2761                         /* SET */ array(
2762                                 'page_touched'   => $dbw->timestamp($now),
2763                                 'page_namespace' => $nt->getNamespace(),
2764                                 'page_title'     => $nt->getDBkey(),
2765                                 'page_latest'    => $nullRevId,
2766                         ),
2767                         /* WHERE */ array( 'page_id' => $oldid ),
2768                         $fname
2769                 );
2770                 $nt->resetArticleID( $oldid );
2771
2772                 # Recreate the redirect, this time in the other direction.
2773                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2774                         $mwRedir = MagicWord::get( 'redirect' );
2775                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2776                         $redirectArticle = new Article( $this );
2777                         $newid = $redirectArticle->insertOn( $dbw );
2778                         $redirectRevision = new Revision( array(
2779                                 'page'    => $newid,
2780                                 'comment' => $comment,
2781                                 'text'    => $redirectText ) );
2782                         $redirectRevision->insertOn( $dbw );
2783                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2784
2785                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2786
2787                         # Now, we record the link from the redirect to the new title.
2788                         # It should have no other outgoing links...
2789                         $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2790                         $dbw->insert( 'pagelinks',
2791                                 array(
2792                                         'pl_from'      => $newid,
2793                                         'pl_namespace' => $nt->getNamespace(),
2794                                         'pl_title'     => $nt->getDBkey() ),
2795                                 $fname );
2796                         $redirectSuppressed = false;
2797                 } else {
2798                         $this->resetArticleID( 0 );
2799                         $redirectSuppressed = true;
2800                 }
2801
2802                 # Move an image if this is a file
2803                 if( $this->getNamespace() == NS_FILE ) {
2804                         $file = wfLocalFile( $this );
2805                         if( $file->exists() ) {
2806                                 $status = $file->move( $nt );
2807                                 if( !$status->isOk() ) {
2808                                         $dbw->rollback();
2809                                         return $status->getErrorsArray();
2810                                 }
2811                         }
2812                 }
2813
2814                 # Log the move
2815                 $log = new LogPage( 'move' );
2816                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2817
2818                 # Purge squid
2819                 if ( $wgUseSquid ) {
2820                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2821                         $u = new SquidUpdate( $urls );
2822                         $u->doUpdate();
2823                 }
2824
2825         }
2826
2827         /**
2828          * Move page to non-existing title.
2829          * @param &$nt \type{Title} the new Title
2830          * @param $reason \type{\string} The reason for the move
2831          * @param $createRedirect \type{\bool} Whether to create a redirect from the old title to the new title
2832          *  Ignored if the user doesn't have the suppressredirect right
2833          */
2834         private function moveToNewTitle( &$nt, $reason = '', $createRedirect = true ) {
2835                 global $wgUseSquid, $wgUser;
2836                 $fname = 'MovePageForm::moveToNewTitle';
2837                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2838                 if ( $reason ) {
2839                         $comment .= wfMsgExt( 'colon-separator',
2840                                 array( 'escapenoentities', 'content' ) );
2841                         $comment .= $reason;
2842                 }
2843
2844                 $newid = $nt->getArticleID();
2845                 $oldid = $this->getArticleID();
2846                 $latest = $this->getLatestRevId();
2847
2848                 $dbw = wfGetDB( DB_MASTER );
2849                 $now = $dbw->timestamp();
2850
2851                 # Save a null revision in the page's history notifying of the move
2852                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2853                 $nullRevId = $nullRevision->insertOn( $dbw );
2854
2855                 $article = new Article( $this );
2856                 wfRunHooks( 'NewRevisionFromEditComplete', array($article, $nullRevision, $latest, $wgUser) );
2857
2858                 # Rename page entry
2859                 $dbw->update( 'page',
2860                         /* SET */ array(
2861                                 'page_touched'   => $now,
2862                                 'page_namespace' => $nt->getNamespace(),
2863                                 'page_title'     => $nt->getDBkey(),
2864                                 'page_latest'    => $nullRevId,
2865                         ),
2866                         /* WHERE */ array( 'page_id' => $oldid ),
2867                         $fname
2868                 );
2869                 $nt->resetArticleID( $oldid );
2870
2871                 if( $createRedirect || !$wgUser->isAllowed('suppressredirect') ) {
2872                         # Insert redirect
2873                         $mwRedir = MagicWord::get( 'redirect' );
2874                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2875                         $redirectArticle = new Article( $this );
2876                         $newid = $redirectArticle->insertOn( $dbw );
2877                         $redirectRevision = new Revision( array(
2878                                 'page'    => $newid,
2879                                 'comment' => $comment,
2880                                 'text'    => $redirectText ) );
2881                         $redirectRevision->insertOn( $dbw );
2882                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2883
2884                         wfRunHooks( 'NewRevisionFromEditComplete', array($redirectArticle, $redirectRevision, false, $wgUser) );
2885
2886                         # Record the just-created redirect's linking to the page
2887                         $dbw->insert( 'pagelinks',
2888                                 array(
2889                                         'pl_from'      => $newid,
2890                                         'pl_namespace' => $nt->getNamespace(),
2891                                         'pl_title'     => $nt->getDBkey() ),
2892                                 $fname );
2893                         $redirectSuppressed = false;
2894                 } else {
2895                         $this->resetArticleID( 0 );
2896                         $redirectSuppressed = true;
2897                 }
2898
2899                 # Move an image if this is a file
2900                 if( $this->getNamespace() == NS_FILE ) {
2901                         $file = wfLocalFile( $this );
2902                         if( $file->exists() ) {
2903                                 $status = $file->move( $nt );
2904                                 if( !$status->isOk() ) {
2905                                         $dbw->rollback();
2906                                         return $status->getErrorsArray();
2907                                 }
2908                         }
2909                 }
2910
2911                 # Log the move
2912                 $log = new LogPage( 'move' );
2913                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText(), 2 => $redirectSuppressed ) );
2914
2915                 # Purge caches as per article creation
2916                 Article::onArticleCreate( $nt );
2917
2918                 # Purge old title from squid
2919                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2920                 $this->purgeSquid();
2921
2922         }
2923
2924         /**
2925          * Checks if this page is just a one-rev redirect.
2926          * Adds lock, so don't use just for light purposes.
2927          *
2928          * @return \type{\bool} TRUE or FALSE
2929          */
2930         public function isSingleRevRedirect() {
2931                 $dbw = wfGetDB( DB_MASTER );
2932                 # Is it a redirect?
2933                 $row = $dbw->selectRow( 'page',
2934                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
2935                         $this->pageCond(),
2936                         __METHOD__,
2937                         'FOR UPDATE'
2938                 );
2939                 # Cache some fields we may want
2940                 $this->mArticleID = $row ? intval($row->page_id) : 0;
2941                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
2942                 $this->mLatestID = $row ? intval($row->page_latest) : false;
2943                 if( !$this->mRedirect ) {
2944                         return false;
2945                 }
2946                 # Does the article have a history?
2947                 $row = $dbw->selectField( array( 'page', 'revision'),
2948                         'rev_id',
2949                         array( 'page_namespace' => $this->getNamespace(),
2950                                 'page_title' => $this->getDBkey(),
2951                                 'page_id=rev_page',
2952                                 'page_latest != rev_id'
2953                         ),
2954                         __METHOD__,
2955                         'FOR UPDATE'
2956                 );
2957                 # Return true if there was no history
2958                 return ($row === false);
2959         }
2960
2961         /**
2962          * Checks if $this can be moved to a given Title
2963          * - Selects for update, so don't call it unless you mean business
2964          *
2965          * @param &$nt \type{Title} the new title to check
2966          * @return \type{\bool} TRUE or FALSE
2967          */
2968         public function isValidMoveTarget( $nt ) {
2969                 $dbw = wfGetDB( DB_MASTER );
2970                 # Is it an existsing file?
2971                 if( $nt->getNamespace() == NS_FILE ) {
2972                         $file = wfLocalFile( $nt );
2973                         if( $file->exists() ) {
2974                                 wfDebug( __METHOD__ . ": file exists\n" );
2975                                 return false;
2976                         }
2977                 }
2978                 # Is it a redirect with no history?
2979                 if( !$nt->isSingleRevRedirect() ) {
2980                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
2981                         return false;
2982                 }
2983                 # Get the article text
2984                 $rev = Revision::newFromTitle( $nt );
2985                 $text = $rev->getText();
2986                 # Does the redirect point to the source?
2987                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2988                 $m = array();
2989                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2990                         $redirTitle = Title::newFromText( $m[1] );
2991                         if( !is_object( $redirTitle ) ||
2992                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2993                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2994                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2995                                 return false;
2996                         }
2997                 } else {
2998                         # Fail safe
2999                         wfDebug( __METHOD__ . ": failsafe\n" );
3000                         return false;
3001                 }
3002                 return true;
3003         }
3004
3005         /**
3006          * Can this title be added to a user's watchlist?
3007          *
3008          * @return \type{\bool} TRUE or FALSE
3009          */
3010         public function isWatchable() {
3011                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
3012         }
3013
3014         /**
3015          * Get categories to which this Title belongs and return an array of
3016          * categories' names.
3017          *
3018          * @return \type{\array} array an array of parents in the form:
3019          *      $parent => $currentarticle
3020          */
3021         public function getParentCategories() {
3022                 global $wgContLang;
3023
3024                 $titlekey = $this->getArticleId();
3025                 $dbr = wfGetDB( DB_SLAVE );
3026                 $categorylinks = $dbr->tableName( 'categorylinks' );
3027
3028                 # NEW SQL
3029                 $sql = "SELECT * FROM $categorylinks"
3030                      ." WHERE cl_from='$titlekey'"
3031                          ." AND cl_from <> '0'"
3032                          ." ORDER BY cl_sortkey";
3033
3034                 $res = $dbr->query( $sql );
3035
3036                 if( $dbr->numRows( $res ) > 0 ) {
3037                         foreach( $res as $row )
3038                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3039                                 $data[$wgContLang->getNSText( NS_CATEGORY ).':'.$row->cl_to] = $this->getFullText();
3040                         $dbr->freeResult( $res );
3041                 } else {
3042                         $data = array();
3043                 }
3044                 return $data;
3045         }
3046
3047         /**
3048          * Get a tree of parent categories
3049          * @param $children \type{\array} an array with the children in the keys, to check for circular refs
3050          * @return \type{\array} Tree of parent categories
3051          */
3052         public function getParentCategoryTree( $children = array() ) {
3053                 $stack = array();
3054                 $parents = $this->getParentCategories();
3055
3056                 if( $parents ) {
3057                         foreach( $parents as $parent => $current ) {
3058                                 if ( array_key_exists( $parent, $children ) ) {
3059                                         # Circular reference
3060                                         $stack[$parent] = array();
3061                                 } else {
3062                                         $nt = Title::newFromText($parent);
3063                                         if ( $nt ) {
3064                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
3065                                         }
3066                                 }
3067                         }
3068                         return $stack;
3069                 } else {
3070                         return array();
3071                 }
3072         }
3073
3074
3075         /**
3076          * Get an associative array for selecting this title from
3077          * the "page" table
3078          *
3079          * @return \type{\array} Selection array
3080          */
3081         public function pageCond() {
3082                 if( $this->mArticleID > 0 ) {
3083                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3084                         return array( 'page_id' => $this->mArticleID );
3085                 } else {
3086                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3087                 }
3088         }
3089
3090         /**
3091          * Get the revision ID of the previous revision
3092          *
3093          * @param $revId \type{\int} Revision ID. Get the revision that was before this one.
3094          * @param $flags \type{\int} GAID_FOR_UPDATE
3095          * @return \twotypes{\int,\bool} Old revision ID, or FALSE if none exists
3096          */
3097         public function getPreviousRevisionID( $revId, $flags=0 ) {
3098                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3099                 return $db->selectField( 'revision', 'rev_id',
3100                         array(
3101                                 'rev_page' => $this->getArticleId($flags),
3102                                 'rev_id < ' . intval( $revId )
3103                         ),
3104                         __METHOD__,
3105                         array( 'ORDER BY' => 'rev_id DESC' )
3106                 );
3107         }
3108
3109         /**
3110          * Get the revision ID of the next revision
3111          *
3112          * @param $revId \type{\int} Revision ID. Get the revision that was after this one.
3113          * @param $flags \type{\int} GAID_FOR_UPDATE
3114          * @return \twotypes{\int,\bool} Next revision ID, or FALSE if none exists
3115          */
3116         public function getNextRevisionID( $revId, $flags=0 ) {
3117                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3118                 return $db->selectField( 'revision', 'rev_id',
3119                         array(
3120                                 'rev_page' => $this->getArticleId($flags),
3121                                 'rev_id > ' . intval( $revId )
3122                         ),
3123                         __METHOD__,
3124                         array( 'ORDER BY' => 'rev_id' )
3125                 );
3126         }
3127
3128         /**
3129          * Get the first revision of the page
3130          *
3131          * @param $flags \type{\int} GAID_FOR_UPDATE
3132          * @return Revision (or NULL if page doesn't exist)
3133          */
3134         public function getFirstRevision( $flags=0 ) {
3135                 $db = ($flags & GAID_FOR_UPDATE) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3136                 $pageId = $this->getArticleId($flags);
3137                 if( !$pageId ) return NULL;
3138                 $row = $db->selectRow( 'revision', '*',
3139                         array( 'rev_page' => $pageId ),
3140                         __METHOD__,
3141                         array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3142                 );
3143                 if( !$row ) {
3144                         return NULL;
3145                 } else {
3146                         return new Revision( $row );
3147                 }
3148         }
3149
3150         /**
3151          * Check if this is a new page
3152          *
3153          * @return bool
3154          */
3155         public function isNewPage() {
3156                 $dbr = wfGetDB( DB_SLAVE );
3157                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3158         }
3159
3160         /**
3161          * Get the oldest revision timestamp of this page
3162          *
3163          * @return string, MW timestamp
3164          */
3165         public function getEarliestRevTime() {
3166                 $dbr = wfGetDB( DB_SLAVE );
3167                 if( $this->exists() ) {
3168                         $min = $dbr->selectField( 'revision',
3169                                 'MIN(rev_timestamp)',
3170                                 array( 'rev_page' => $this->getArticleId() ),
3171                                 __METHOD__ );
3172                         return wfTimestampOrNull( TS_MW, $min );
3173                 }
3174                 return null;
3175         }
3176
3177         /**
3178          * Get the number of revisions between the given revision IDs.
3179          * Used for diffs and other things that really need it.
3180          *
3181          * @param $old \type{\int} Revision ID.
3182          * @param $new \type{\int} Revision ID.
3183          * @return \type{\int} Number of revisions between these IDs.
3184          */
3185         public function countRevisionsBetween( $old, $new ) {
3186                 $dbr = wfGetDB( DB_SLAVE );
3187                 return $dbr->selectField( 'revision', 'count(*)',
3188                         'rev_page = ' . intval( $this->getArticleId() ) .
3189                         ' AND rev_id > ' . intval( $old ) .
3190                         ' AND rev_id < ' . intval( $new ),
3191                         __METHOD__,
3192                         array( 'USE INDEX' => 'PRIMARY' ) );
3193         }
3194
3195         /**
3196          * Compare with another title.
3197          *
3198          * @param \type{Title} $title
3199          * @return \type{\bool} TRUE or FALSE
3200          */
3201         public function equals( Title $title ) {
3202                 // Note: === is necessary for proper matching of number-like titles.
3203                 return $this->getInterwiki() === $title->getInterwiki()
3204                         && $this->getNamespace() == $title->getNamespace()
3205                         && $this->getDBkey() === $title->getDBkey();
3206         }
3207
3208         /**
3209          * Callback for usort() to do title sorts by (namespace, title)
3210          */
3211         static function compare( $a, $b ) {
3212                 if( $a->getNamespace() == $b->getNamespace() ) {
3213                         return strcmp( $a->getText(), $b->getText() );
3214                 } else {
3215                         return $a->getNamespace() - $b->getNamespace();
3216                 }
3217         }
3218
3219         /**
3220          * Return a string representation of this title
3221          *
3222          * @return \type{\string} String representation of this title
3223          */
3224         public function __toString() {
3225                 return $this->getPrefixedText();
3226         }
3227
3228         /**
3229          * Check if page exists.  For historical reasons, this function simply
3230          * checks for the existence of the title in the page table, and will
3231          * thus return false for interwiki links, special pages and the like.
3232          * If you want to know if a title can be meaningfully viewed, you should
3233          * probably call the isKnown() method instead.
3234          *
3235          * @return \type{\bool} TRUE or FALSE
3236          */
3237         public function exists() {
3238                 return $this->getArticleId() != 0;
3239         }
3240
3241         /**
3242          * Should links to this title be shown as potentially viewable (i.e. as
3243          * "bluelinks"), even if there's no record by this title in the page
3244          * table?
3245          *
3246          * This function is semi-deprecated for public use, as well as somewhat
3247          * misleadingly named.  You probably just want to call isKnown(), which
3248          * calls this function internally.
3249          *
3250          * (ISSUE: Most of these checks are cheap, but the file existence check
3251          * can potentially be quite expensive.  Including it here fixes a lot of
3252          * existing code, but we might want to add an optional parameter to skip
3253          * it and any other expensive checks.)
3254          *
3255          * @return \type{\bool} TRUE or FALSE
3256          */
3257         public function isAlwaysKnown() {
3258                 if( $this->mInterwiki != '' ) {
3259                         return true;  // any interwiki link might be viewable, for all we know
3260                 }
3261                 switch( $this->mNamespace ) {
3262                 case NS_MEDIA:
3263                 case NS_FILE:
3264                         return wfFindFile( $this );  // file exists, possibly in a foreign repo
3265                 case NS_SPECIAL:
3266                         return SpecialPage::exists( $this->getDBKey() );  // valid special page
3267                 case NS_MAIN:
3268                         return $this->mDbkeyform == '';  // selflink, possibly with fragment
3269                 case NS_MEDIAWIKI:
3270                         // If the page is form Mediawiki:message/lang, calling wfMsgWeirdKey causes
3271                         // the full l10n of that language to be loaded. That takes much memory and
3272                         // isn't needed. So we strip the language part away.
3273                         // Also, extension messages which are not loaded, are shown as red, because
3274                         // we don't call MessageCache::loadAllMessages.
3275                         list( $basename, /* rest */ ) = explode( '/', $this->mDbkeyform, 2 );
3276                         return wfMsgWeirdKey( $basename );  // known system message
3277                 default:
3278                         return false;
3279                 }
3280         }
3281
3282         /**
3283          * Does this title refer to a page that can (or might) be meaningfully
3284          * viewed?  In particular, this function may be used to determine if
3285          * links to the title should be rendered as "bluelinks" (as opposed to
3286          * "redlinks" to non-existent pages).
3287          *
3288          * @return \type{\bool} TRUE or FALSE
3289          */
3290         public function isKnown() {
3291                 return $this->exists() || $this->isAlwaysKnown();
3292         }
3293
3294         /**
3295         * Is this in a namespace that allows actual pages?
3296         *
3297         * @return \type{\bool} TRUE or FALSE
3298         */
3299         public function canExist() {
3300                 return $this->mNamespace >= 0 && $this->mNamespace != NS_MEDIA;
3301         }
3302
3303         /**
3304          * Update page_touched timestamps and send squid purge messages for
3305          * pages linking to this title. May be sent to the job queue depending
3306          * on the number of links. Typically called on create and delete.
3307          */
3308         public function touchLinks() {
3309                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
3310                 $u->doUpdate();
3311
3312                 if ( $this->getNamespace() == NS_CATEGORY ) {
3313                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
3314                         $u->doUpdate();
3315                 }
3316         }
3317
3318         /**
3319          * Get the last touched timestamp
3320          * @param Database $db, optional db
3321          * @return \type{\string} Last touched timestamp
3322          */
3323         public function getTouched( $db = NULL ) {
3324                 $db = isset($db) ? $db : wfGetDB( DB_SLAVE );
3325                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
3326                 return $touched;
3327         }
3328
3329         /**
3330          * Get the timestamp when this page was updated since the user last saw it.
3331          * @param User $user
3332          * @return mixed string/NULL
3333          */
3334         public function getNotificationTimestamp( $user = NULL ) {
3335                 global $wgUser, $wgShowUpdatedMarker;
3336                 // Assume current user if none given
3337                 if( !$user ) $user = $wgUser;
3338                 // Check cache first
3339                 $uid = $user->getId();
3340                 if( isset($this->mNotificationTimestamp[$uid]) ) {
3341                         return $this->mNotificationTimestamp[$uid];
3342                 }
3343                 if( !$uid || !$wgShowUpdatedMarker ) {
3344                         return $this->mNotificationTimestamp[$uid] = false;
3345                 }
3346                 // Don't cache too much!
3347                 if( count($this->mNotificationTimestamp) >= self::CACHE_MAX ) {
3348                         $this->mNotificationTimestamp = array();
3349                 }
3350                 $dbr = wfGetDB( DB_SLAVE );
3351                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
3352                         'wl_notificationtimestamp',
3353                         array( 'wl_namespace' => $this->getNamespace(),
3354                                 'wl_title' => $this->getDBkey(),
3355                                 'wl_user' => $user->getId()
3356                         ),
3357                         __METHOD__
3358                 );
3359                 return $this->mNotificationTimestamp[$uid];
3360         }
3361
3362         /**
3363          * Get the trackback URL for this page
3364          * @return \type{\string} Trackback URL
3365          */
3366         public function trackbackURL() {
3367                 global $wgScriptPath, $wgServer;
3368
3369                 return "$wgServer$wgScriptPath/trackback.php?article="
3370                         . htmlspecialchars(urlencode($this->getPrefixedDBkey()));
3371         }
3372
3373         /**
3374          * Get the trackback RDF for this page
3375          * @return \type{\string} Trackback RDF
3376          */
3377         public function trackbackRDF() {
3378                 $url = htmlspecialchars($this->getFullURL());
3379                 $title = htmlspecialchars($this->getText());
3380                 $tburl = $this->trackbackURL();
3381
3382                 // Autodiscovery RDF is placed in comments so HTML validator
3383                 // won't barf. This is a rather icky workaround, but seems
3384                 // frequently used by this kind of RDF thingy.
3385                 //
3386                 // Spec: http://www.sixapart.com/pronet/docs/trackback_spec
3387                 return "<!--
3388 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
3389          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
3390          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
3391 <rdf:Description
3392    rdf:about=\"$url\"
3393    dc:identifier=\"$url\"
3394    dc:title=\"$title\"
3395    trackback:ping=\"$tburl\" />
3396 </rdf:RDF>
3397 -->";
3398         }
3399
3400         /**
3401          * Generate strings used for xml 'id' names in monobook tabs
3402          * @return \type{\string} XML 'id' name
3403          */
3404         public function getNamespaceKey() {
3405                 global $wgContLang;
3406                 switch ($this->getNamespace()) {
3407                         case NS_MAIN:
3408                         case NS_TALK:
3409                                 return 'nstab-main';
3410                         case NS_USER:
3411                         case NS_USER_TALK:
3412                                 return 'nstab-user';
3413                         case NS_MEDIA:
3414                                 return 'nstab-media';
3415                         case NS_SPECIAL:
3416                                 return 'nstab-special';
3417                         case NS_PROJECT:
3418                         case NS_PROJECT_TALK:
3419                                 return 'nstab-project';
3420                         case NS_FILE:
3421                         case NS_FILE_TALK:
3422                                 return 'nstab-image';
3423                         case NS_MEDIAWIKI:
3424                         case NS_MEDIAWIKI_TALK:
3425                                 return 'nstab-mediawiki';
3426                         case NS_TEMPLATE:
3427                         case NS_TEMPLATE_TALK:
3428                                 return 'nstab-template';
3429                         case NS_HELP:
3430                         case NS_HELP_TALK:
3431                                 return 'nstab-help';
3432                         case NS_CATEGORY:
3433                         case NS_CATEGORY_TALK:
3434                                 return 'nstab-category';
3435                         default:
3436                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
3437                 }
3438         }
3439
3440         /**
3441          * Returns true if this title resolves to the named special page
3442          * @param $name \type{\string} The special page name
3443          */
3444         public function isSpecial( $name ) {
3445                 if ( $this->getNamespace() == NS_SPECIAL ) {
3446                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
3447                         if ( $name == $thisName ) {
3448                                 return true;
3449                         }
3450                 }
3451                 return false;
3452         }
3453
3454         /**
3455          * If the Title refers to a special page alias which is not the local default,
3456          * @return \type{Title} A new Title which points to the local default. Otherwise, returns $this.
3457          */
3458         public function fixSpecialName() {
3459                 if ( $this->getNamespace() == NS_SPECIAL ) {
3460                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
3461                         if ( $canonicalName ) {
3462                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
3463                                 if ( $localName != $this->mDbkeyform ) {
3464                                         return Title::makeTitle( NS_SPECIAL, $localName );
3465                                 }
3466                         }
3467                 }
3468                 return $this;
3469         }
3470
3471         /**
3472          * Is this Title in a namespace which contains content?
3473          * In other words, is this a content page, for the purposes of calculating
3474          * statistics, etc?
3475          *
3476          * @return \type{\bool} TRUE or FALSE
3477          */
3478         public function isContentPage() {
3479                 return MWNamespace::isContent( $this->getNamespace() );
3480         }
3481
3482         /**
3483          * Get all extant redirects to this Title
3484          *
3485          * @param $ns \twotypes{\int,\null} Single namespace to consider;
3486          *            NULL to consider all namespaces
3487          * @return \type{\arrayof{Title}} Redirects to this title
3488          */
3489         public function getRedirectsHere( $ns = null ) {
3490                 $redirs = array();
3491
3492                 $dbr = wfGetDB( DB_SLAVE );
3493                 $where = array(
3494                         'rd_namespace' => $this->getNamespace(),
3495                         'rd_title' => $this->getDBkey(),
3496                         'rd_from = page_id'
3497                 );
3498                 if ( !is_null($ns) ) $where['page_namespace'] = $ns;
3499
3500                 $res = $dbr->select(
3501                         array( 'redirect', 'page' ),
3502                         array( 'page_namespace', 'page_title' ),
3503                         $where,
3504                         __METHOD__
3505                 );
3506
3507
3508                 foreach( $res as $row ) {
3509                         $redirs[] = self::newFromRow( $row );
3510                 }
3511                 return $redirs;
3512         }
3513
3514         /**
3515          * Check if this Title is a valid redirect target
3516          *
3517          * @return \type{\bool} TRUE or FALSE
3518          */
3519         public function isValidRedirectTarget() {
3520                 global $wgInvalidRedirectTargets;
3521
3522                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
3523                 if( $this->isSpecial( 'Userlogout' ) ) {
3524                         return false;
3525                 }
3526
3527                 foreach( $wgInvalidRedirectTargets as $target ) {
3528                         if( $this->isSpecial( $target ) ) {
3529                                 return false;
3530                         }
3531                 }
3532
3533                 return true;
3534         }
3535 }