includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Represents a title within MediaWiki.
  25  * Optionally may contain an interwiki designation or namespace.
  26  * @note This class can fetch various kinds of data from the database;
  27  *       however, it does so inefficiently.
  28  *
  29  * @internal documentation reviewed 15 Mar 2010
  30  */
  31 class Title {
  32         /** @name Static cache variables */
  33         // @{
  34         static private $titleCache = array();
  35         // @}
  36
  37         /**
  38          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  39          * commonly used titles. On a batch operation this can become a memory leak
  40          * if not bounded. After hitting this many titles reset the cache.
  41          */
  42         const CACHE_MAX = 1000;
  43
  44         /**
  45          * Used to be GAID_FOR_UPDATE define. Used with getArticleID() and friends
  46          * to use the master DB
  47          */
  48         const GAID_FOR_UPDATE = 1;
  49
  50         /**
  51          * @name Private member variables
  52          * Please use the accessor functions instead.
  53          * @private
  54          */
  55         // @{
  56
  57         var $mTextform = '';              // /< Text form (spaces not underscores) of the main part
  58         var $mUrlform = '';               // /< URL-encoded form of the main part
  59         var $mDbkeyform = '';             // /< Main part with underscores
  60         var $mUserCaseDBKey;              // /< DB key with the initial letter in the case specified by the user
  61         var $mNamespace = NS_MAIN;        // /< Namespace index, i.e. one of the NS_xxxx constants
  62         var $mInterwiki = '';             // /< Interwiki prefix (or null string)
  63         var $mFragment;                   // /< Title fragment (i.e. the bit after the #)
  64         var $mArticleID = -1;             // /< Article ID, fetched from the link cache on demand
  65         var $mLatestID = false;           // /< ID of most recent revision
  66         private $mEstimateRevisions;      // /< Estimated number of revisions; null of not loaded
  67         var $mRestrictions = array();     // /< Array of groups allowed to edit this article
  68         var $mOldRestrictions = false;
  69         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  70         var $mCascadingRestrictions;      // Caching the results of getCascadeProtectionSources
  71         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  72         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  73         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  74         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  75         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  76         var $mTitleProtection;            ///< Cached value for getTitleProtection (create protection)
  77         # Don't change the following default, NS_MAIN is hardcoded in several
  78         # places.  See bug 696.
  79         var $mDefaultNamespace = NS_MAIN; // /< Namespace index when there is no namespace
  80                                                                           # Zero except in {{transclusion}} tags
  81         var $mWatched = null;             // /< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  82         var $mLength = -1;                // /< The page length, 0 for special pages
  83         var $mRedirect = null;            // /< Is the article at this title a redirect?
  84         var $mNotificationTimestamp = array(); // /< Associative array of user ID -> timestamp/false
  85         var $mBacklinkCache = null;       // /< Cache of links to this title
  86         var $mHasSubpage;                 // /< Whether a page has any subpages
  87         // @}
  88
  89
  90         /**
  91          * Constructor
  92          */
  93         /*protected*/ function __construct() { }
  94
  95         /**
  96          * Create a new Title from a prefixed DB key
  97          *
  98          * @param $key String the database key, which has underscores
  99          *      instead of spaces, possibly including namespace and
 100          *      interwiki prefixes
 101          * @return Title, or NULL on an error
 102          */
 103         public static function newFromDBkey( $key ) {
 104                 $t = new Title();
 105                 $t->mDbkeyform = $key;
 106                 if ( $t->secureAndSplit() ) {
 107                         return $t;
 108                 } else {
 109                         return null;
 110                 }
 111         }
 112
 113         /**
 114          * Create a new Title from text, such as what one would find in a link. De-
 115          * codes any HTML entities in the text.
 116          *
 117          * @param $text String the link text; spaces, prefixes, and an
 118          *   initial ':' indicating the main namespace are accepted.
 119          * @param $defaultNamespace Int the namespace to use if none is speci-
 120          *   fied by a prefix.  If you want to force a specific namespace even if
 121          *   $text might begin with a namespace prefix, use makeTitle() or
 122          *   makeTitleSafe().
 123          * @throws MWException
 124          * @return Title|null - Title or null on an error.
 125          */
 126         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 127                 if ( is_object( $text ) ) {
 128                         throw new MWException( 'Title::newFromText given an object' );
 129                 }
 130
 131                 /**
 132                  * Wiki pages often contain multiple links to the same page.
 133                  * Title normalization and parsing can become expensive on
 134                  * pages with many links, so we can save a little time by
 135                  * caching them.
 136                  *
 137                  * In theory these are value objects and won't get changed...
 138                  */
 139                 if ( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 140                         return Title::$titleCache[$text];
 141                 }
 142
 143                 # Convert things like &eacute; &#257; or &#x3017; into normalized (bug 14952) text
 144                 $filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );
 145
 146                 $t = new Title();
 147                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 148                 $t->mDefaultNamespace = $defaultNamespace;
 149
 150                 static $cachedcount = 0 ;
 151                 if ( $t->secureAndSplit() ) {
 152                         if ( $defaultNamespace == NS_MAIN ) {
 153                                 if ( $cachedcount >= self::CACHE_MAX ) {
 154                                         # Avoid memory leaks on mass operations...
 155                                         Title::$titleCache = array();
 156                                         $cachedcount = 0;
 157                                 }
 158                                 $cachedcount++;
 159                                 Title::$titleCache[$text] =& $t;
 160                         }
 161                         return $t;
 162                 } else {
 163                         $ret = null;
 164                         return $ret;
 165                 }
 166         }
 167
 168         /**
 169          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 170          *
 171          * Example of wrong and broken code:
 172          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 173          *
 174          * Example of right code:
 175          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 176          *
 177          * Create a new Title from URL-encoded text. Ensures that
 178          * the given title's length does not exceed the maximum.
 179          *
 180          * @param $url String the title, as might be taken from a URL
 181          * @return Title the new object, or NULL on an error
 182          */
 183         public static function newFromURL( $url ) {
 184                 global $wgLegalTitleChars;
 185                 $t = new Title();
 186
 187                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 188                 # but some URLs used it as a space replacement and they still come
 189                 # from some external search tools.
 190                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 191                         $url = str_replace( '+', ' ', $url );
 192                 }
 193
 194                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 195                 if ( $t->secureAndSplit() ) {
 196                         return $t;
 197                 } else {
 198                         return null;
 199                 }
 200         }
 201
 202         /**
 203          * Create a new Title from an article ID
 204          *
 205          * @param $id Int the page_id corresponding to the Title to create
 206          * @param $flags Int use Title::GAID_FOR_UPDATE to use master
 207          * @return Title the new object, or NULL on an error
 208          */
 209         public static function newFromID( $id, $flags = 0 ) {
 210                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 211                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 212                 if ( $row !== false ) {
 213                         $title = Title::newFromRow( $row );
 214                 } else {
 215                         $title = null;
 216                 }
 217                 return $title;
 218         }
 219
 220         /**
 221          * Make an array of titles from an array of IDs
 222          *
 223          * @param $ids Array of Int Array of IDs
 224          * @return Array of Titles
 225          */
 226         public static function newFromIDs( $ids ) {
 227                 if ( !count( $ids ) ) {
 228                         return array();
 229                 }
 230                 $dbr = wfGetDB( DB_SLAVE );
 231
 232                 $res = $dbr->select(
 233                         'page',
 234                         array(
 235                                 'page_namespace', 'page_title', 'page_id',
 236                                 'page_len', 'page_is_redirect', 'page_latest',
 237                         ),
 238                         array( 'page_id' => $ids ),
 239                         __METHOD__
 240                 );
 241
 242                 $titles = array();
 243                 foreach ( $res as $row ) {
 244                         $titles[] = Title::newFromRow( $row );
 245                 }
 246                 return $titles;
 247         }
 248
 249         /**
 250          * Make a Title object from a DB row
 251          *
 252          * @param $row Object database row (needs at least page_title,page_namespace)
 253          * @return Title corresponding Title
 254          */
 255         public static function newFromRow( $row ) {
 256                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 257                 $t->loadFromRow( $row );
 258                 return $t;
 259         }
 260
 261         /**
 262          * Load Title object fields from a DB row.
 263          * If false is given, the title will be treated as non-existing.
 264          *
 265          * @param $row Object|bool database row
 266          */
 267         public function loadFromRow( $row ) {
 268                 if ( $row ) { // page found
 269                         if ( isset( $row->page_id ) )
 270                                 $this->mArticleID = (int)$row->page_id;
 271                         if ( isset( $row->page_len ) )
 272                                 $this->mLength = (int)$row->page_len;
 273                         if ( isset( $row->page_is_redirect ) )
 274                                 $this->mRedirect = (bool)$row->page_is_redirect;
 275                         if ( isset( $row->page_latest ) )
 276                                 $this->mLatestID = (int)$row->page_latest;
 277                 } else { // page not found
 278                         $this->mArticleID = 0;
 279                         $this->mLength = 0;
 280                         $this->mRedirect = false;
 281                         $this->mLatestID = 0;
 282                 }
 283         }
 284
 285         /**
 286          * Create a new Title from a namespace index and a DB key.
 287          * It's assumed that $ns and $title are *valid*, for instance when
 288          * they came directly from the database or a special page name.
 289          * For convenience, spaces are converted to underscores so that
 290          * eg user_text fields can be used directly.
 291          *
 292          * @param $ns Int the namespace of the article
 293          * @param $title String the unprefixed database key form
 294          * @param $fragment String the link fragment (after the "#")
 295          * @param $interwiki String the interwiki prefix
 296          * @return Title the new object
 297          */
 298         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 299                 $t = new Title();
 300                 $t->mInterwiki = $interwiki;
 301                 $t->mFragment = $fragment;
 302                 $t->mNamespace = $ns = intval( $ns );
 303                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 304                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 305                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 306                 $t->mTextform = str_replace( '_', ' ', $title );
 307                 return $t;
 308         }
 309
 310         /**
 311          * Create a new Title from a namespace index and a DB key.
 312          * The parameters will be checked for validity, which is a bit slower
 313          * than makeTitle() but safer for user-provided data.
 314          *
 315          * @param $ns Int the namespace of the article
 316          * @param $title String database key form
 317          * @param $fragment String the link fragment (after the "#")
 318          * @param $interwiki String interwiki prefix
 319          * @return Title the new object, or NULL on an error
 320          */
 321         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 322                 if ( !MWNamespace::exists( $ns ) ) {
 323                         return null;
 324                 }
 325
 326                 $t = new Title();
 327                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 328                 if ( $t->secureAndSplit() ) {
 329                         return $t;
 330                 } else {
 331                         return null;
 332                 }
 333         }
 334
 335         /**
 336          * Create a new Title for the Main Page
 337          *
 338          * @return Title the new object
 339          */
 340         public static function newMainPage() {
 341                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 342                 // Don't give fatal errors if the message is broken
 343                 if ( !$title ) {
 344                         $title = Title::newFromText( 'Main Page' );
 345                 }
 346                 return $title;
 347         }
 348
 349         /**
 350          * Extract a redirect destination from a string and return the
 351          * Title, or null if the text doesn't contain a valid redirect
 352          * This will only return the very next target, useful for
 353          * the redirect table and other checks that don't need full recursion
 354          *
 355          * @param $text String: Text with possible redirect
 356          * @return Title: The corresponding Title
 357          */
 358         public static function newFromRedirect( $text ) {
 359                 return self::newFromRedirectInternal( $text );
 360         }
 361
 362         /**
 363          * Extract a redirect destination from a string and return the
 364          * Title, or null if the text doesn't contain a valid redirect
 365          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 366          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 367          *
 368          * @param $text String Text with possible redirect
 369          * @return Title
 370          */
 371         public static function newFromRedirectRecurse( $text ) {
 372                 $titles = self::newFromRedirectArray( $text );
 373                 return $titles ? array_pop( $titles ) : null;
 374         }
 375
 376         /**
 377          * Extract a redirect destination from a string and return an
 378          * array of Titles, or null if the text doesn't contain a valid redirect
 379          * The last element in the array is the final destination after all redirects
 380          * have been resolved (up to $wgMaxRedirects times)
 381          *
 382          * @param $text String Text with possible redirect
 383          * @return Array of Titles, with the destination last
 384          */
 385         public static function newFromRedirectArray( $text ) {
 386                 global $wgMaxRedirects;
 387                 $title = self::newFromRedirectInternal( $text );
 388                 if ( is_null( $title ) ) {
 389                         return null;
 390                 }
 391                 // recursive check to follow double redirects
 392                 $recurse = $wgMaxRedirects;
 393                 $titles = array( $title );
 394                 while ( --$recurse > 0 ) {
 395                         if ( $title->isRedirect() ) {
 396                                 $page = WikiPage::factory( $title );
 397                                 $newtitle = $page->getRedirectTarget();
 398                         } else {
 399                                 break;
 400                         }
 401                         // Redirects to some special pages are not permitted
 402                         if ( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 403                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 404                                 $title = $newtitle;
 405                                 $titles[] = $newtitle;
 406                         } else {
 407                                 break;
 408                         }
 409                 }
 410                 return $titles;
 411         }
 412
 413         /**
 414          * Really extract the redirect destination
 415          * Do not call this function directly, use one of the newFromRedirect* functions above
 416          *
 417          * @param $text String Text with possible redirect
 418          * @return Title
 419          */
 420         protected static function newFromRedirectInternal( $text ) {
 421                 global $wgMaxRedirects;
 422                 if ( $wgMaxRedirects < 1 ) {
 423                         //redirects are disabled, so quit early
 424                         return null;
 425                 }
 426                 $redir = MagicWord::get( 'redirect' );
 427                 $text = trim( $text );
 428                 if ( $redir->matchStartAndRemove( $text ) ) {
 429                         // Extract the first link and see if it's usable
 430                         // Ensure that it really does come directly after #REDIRECT
 431                         // Some older redirects included a colon, so don't freak about that!
 432                         $m = array();
 433                         if ( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 434                                 // Strip preceding colon used to "escape" categories, etc.
 435                                 // and URL-decode links
 436                                 if ( strpos( $m[1], '%' ) !== false ) {
 437                                         // Match behavior of inline link parsing here;
 438                                         $m[1] = rawurldecode( ltrim( $m[1], ':' ) );
 439                                 }
 440                                 $title = Title::newFromText( $m[1] );
 441                                 // If the title is a redirect to bad special pages or is invalid, return null
 442                                 if ( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 443                                         return null;
 444                                 }
 445                                 return $title;
 446                         }
 447                 }
 448                 return null;
 449         }
 450
 451         /**
 452          * Get the prefixed DB key associated with an ID
 453          *
 454          * @param $id Int the page_id of the article
 455          * @return Title an object representing the article, or NULL if no such article was found
 456          */
 457         public static function nameOf( $id ) {
 458                 $dbr = wfGetDB( DB_SLAVE );
 459
 460                 $s = $dbr->selectRow(
 461                         'page',
 462                         array( 'page_namespace', 'page_title' ),
 463                         array( 'page_id' => $id ),
 464                         __METHOD__
 465                 );
 466                 if ( $s === false ) {
 467                         return null;
 468                 }
 469
 470                 $n = self::makeName( $s->page_namespace, $s->page_title );
 471                 return $n;
 472         }
 473
 474         /**
 475          * Get a regex character class describing the legal characters in a link
 476          *
 477          * @return String the list of characters, not delimited
 478          */
 479         public static function legalChars() {
 480                 global $wgLegalTitleChars;
 481                 return $wgLegalTitleChars;
 482         }
 483
 484         /**
 485          * Returns a simple regex that will match on characters and sequences invalid in titles.
 486          * Note that this doesn't pick up many things that could be wrong with titles, but that
 487          * replacing this regex with something valid will make many titles valid.
 488          *
 489          * @return String regex string
 490          */
 491         static function getTitleInvalidRegex() {
 492                 static $rxTc = false;
 493                 if ( !$rxTc ) {
 494                         # Matching titles will be held as illegal.
 495                         $rxTc = '/' .
 496                                 # Any character not allowed is forbidden...
 497                                 '[^' . self::legalChars() . ']' .
 498                                 # URL percent encoding sequences interfere with the ability
 499                                 # to round-trip titles -- you can't link to them consistently.
 500                                 '|%[0-9A-Fa-f]{2}' .
 501                                 # XML/HTML character references produce similar issues.
 502                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 503                                 '|&#[0-9]+;' .
 504                                 '|&#x[0-9A-Fa-f]+;' .
 505                                 '/S';
 506                 }
 507
 508                 return $rxTc;
 509         }
 510
 511         /**
 512          * Get a string representation of a title suitable for
 513          * including in a search index
 514          *
 515          * @param $ns Int a namespace index
 516          * @param $title String text-form main part
 517          * @return String a stripped-down title string ready for the search index
 518          */
 519         public static function indexTitle( $ns, $title ) {
 520                 global $wgContLang;
 521
 522                 $lc = SearchEngine::legalSearchChars() . '&#;';
 523                 $t = $wgContLang->normalizeForSearch( $title );
 524                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 525                 $t = $wgContLang->lc( $t );
 526
 527                 # Handle 's, s'
 528                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 529                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 530
 531                 $t = preg_replace( "/\\s+/", ' ', $t );
 532
 533                 if ( $ns == NS_FILE ) {
 534                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 535                 }
 536                 return trim( $t );
 537         }
 538
 539         /**
 540          * Make a prefixed DB key from a DB key and a namespace index
 541          *
 542          * @param $ns Int numerical representation of the namespace
 543          * @param $title String the DB key form the title
 544          * @param $fragment String The link fragment (after the "#")
 545          * @param $interwiki String The interwiki prefix
 546          * @return String the prefixed form of the title
 547          */
 548         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 549                 global $wgContLang;
 550
 551                 $namespace = $wgContLang->getNsText( $ns );
 552                 $name = $namespace == '' ? $title : "$namespace:$title";
 553                 if ( strval( $interwiki ) != '' ) {
 554                         $name = "$interwiki:$name";
 555                 }
 556                 if ( strval( $fragment ) != '' ) {
 557                         $name .= '#' . $fragment;
 558                 }
 559                 return $name;
 560         }
 561
 562         /**
 563          * Escape a text fragment, say from a link, for a URL
 564          *
 565          * @param $fragment string containing a URL or link fragment (after the "#")
 566          * @return String: escaped string
 567          */
 568         static function escapeFragmentForURL( $fragment ) {
 569                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 570                 # fragments appear not to work in IE (at least up to 7) or in at least
 571                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 572                 # to care if they aren't encoded.
 573                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 574         }
 575
 576         /**
 577          * Callback for usort() to do title sorts by (namespace, title)
 578          *
 579          * @param $a Title
 580          * @param $b Title
 581          *
 582          * @return Integer: result of string comparison, or namespace comparison
 583          */
 584         public static function compare( $a, $b ) {
 585                 if ( $a->getNamespace() == $b->getNamespace() ) {
 586                         return strcmp( $a->getText(), $b->getText() );
 587                 } else {
 588                         return $a->getNamespace() - $b->getNamespace();
 589                 }
 590         }
 591
 592         /**
 593          * Determine whether the object refers to a page within
 594          * this project.
 595          *
 596          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 597          */
 598         public function isLocal() {
 599                 if ( $this->mInterwiki != '' ) {
 600                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 601                 } else {
 602                         return true;
 603                 }
 604         }
 605
 606         /**
 607          * Is this Title interwiki?
 608          *
 609          * @return Bool
 610          */
 611         public function isExternal() {
 612                 return ( $this->mInterwiki != '' );
 613         }
 614
 615         /**
 616          * Get the interwiki prefix (or null string)
 617          *
 618          * @return String Interwiki prefix
 619          */
 620         public function getInterwiki() {
 621                 return $this->mInterwiki;
 622         }
 623
 624         /**
 625          * Determine whether the object refers to a page within
 626          * this project and is transcludable.
 627          *
 628          * @return Bool TRUE if this is transcludable
 629          */
 630         public function isTrans() {
 631                 if ( $this->mInterwiki == '' ) {
 632                         return false;
 633                 }
 634
 635                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 636         }
 637
 638         /**
 639          * Returns the DB name of the distant wiki which owns the object.
 640          *
 641          * @return String the DB name
 642          */
 643         public function getTransWikiID() {
 644                 if ( $this->mInterwiki == '' ) {
 645                         return false;
 646                 }
 647
 648                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 649         }
 650
 651         /**
 652          * Get the text form (spaces not underscores) of the main part
 653          *
 654          * @return String Main part of the title
 655          */
 656         public function getText() {
 657                 return $this->mTextform;
 658         }
 659
 660         /**
 661          * Get the URL-encoded form of the main part
 662          *
 663          * @return String Main part of the title, URL-encoded
 664          */
 665         public function getPartialURL() {
 666                 return $this->mUrlform;
 667         }
 668
 669         /**
 670          * Get the main part with underscores
 671          *
 672          * @return String: Main part of the title, with underscores
 673          */
 674         public function getDBkey() {
 675                 return $this->mDbkeyform;
 676         }
 677
 678         /**
 679          * Get the DB key with the initial letter case as specified by the user
 680          *
 681          * @return String DB key
 682          */
 683         function getUserCaseDBKey() {
 684                 return $this->mUserCaseDBKey;
 685         }
 686
 687         /**
 688          * Get the namespace index, i.e. one of the NS_xxxx constants.
 689          *
 690          * @return Integer: Namespace index
 691          */
 692         public function getNamespace() {
 693                 return $this->mNamespace;
 694         }
 695
 696         /**
 697          * Get the namespace text
 698          *
 699          * @return String: Namespace text
 700          */
 701         public function getNsText() {
 702                 global $wgContLang;
 703
 704                 if ( $this->mInterwiki != '' ) {
 705                         // This probably shouldn't even happen. ohh man, oh yuck.
 706                         // But for interwiki transclusion it sometimes does.
 707                         // Shit. Shit shit shit.
 708                         //
 709                         // Use the canonical namespaces if possible to try to
 710                         // resolve a foreign namespace.
 711                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 712                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 713                         }
 714                 }
 715
 716                 if ( $wgContLang->needsGenderDistinction() &&
 717                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 718                         $gender = GenderCache::singleton()->getGenderOf( $this->getText(), __METHOD__ );
 719                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 720                 }
 721
 722                 return $wgContLang->getNsText( $this->mNamespace );
 723         }
 724
 725         /**
 726          * Get the namespace text of the subject (rather than talk) page
 727          *
 728          * @return String Namespace text
 729          */
 730         public function getSubjectNsText() {
 731                 global $wgContLang;
 732                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 733         }
 734
 735         /**
 736          * Get the namespace text of the talk page
 737          *
 738          * @return String Namespace text
 739          */
 740         public function getTalkNsText() {
 741                 global $wgContLang;
 742                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 743         }
 744
 745         /**
 746          * Could this title have a corresponding talk page?
 747          *
 748          * @return Bool TRUE or FALSE
 749          */
 750         public function canTalk() {
 751                 return( MWNamespace::canTalk( $this->mNamespace ) );
 752         }
 753
 754         /**
 755          * Is this in a namespace that allows actual pages?
 756          *
 757          * @return Bool
 758          * @internal note -- uses hardcoded namespace index instead of constants
 759          */
 760         public function canExist() {
 761                 return $this->mNamespace >= NS_MAIN;
 762         }
 763
 764         /**
 765          * Can this title be added to a user's watchlist?
 766          *
 767          * @return Bool TRUE or FALSE
 768          */
 769         public function isWatchable() {
 770                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 771         }
 772
 773         /**
 774          * Returns true if this is a special page.
 775          *
 776          * @return boolean
 777          */
 778         public function isSpecialPage() {
 779                 return $this->getNamespace() == NS_SPECIAL;
 780         }
 781
 782         /**
 783          * Returns true if this title resolves to the named special page
 784          *
 785          * @param $name String The special page name
 786          * @return boolean
 787          */
 788         public function isSpecial( $name ) {
 789                 if ( $this->isSpecialPage() ) {
 790                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 791                         if ( $name == $thisName ) {
 792                                 return true;
 793                         }
 794                 }
 795                 return false;
 796         }
 797
 798         /**
 799          * If the Title refers to a special page alias which is not the local default, resolve
 800          * the alias, and localise the name as necessary.  Otherwise, return $this
 801          *
 802          * @return Title
 803          */
 804         public function fixSpecialName() {
 805                 if ( $this->isSpecialPage() ) {
 806                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 807                         if ( $canonicalName ) {
 808                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 809                                 if ( $localName != $this->mDbkeyform ) {
 810                                         return Title::makeTitle( NS_SPECIAL, $localName );
 811                                 }
 812                         }
 813                 }
 814                 return $this;
 815         }
 816
 817         /**
 818          * Returns true if the title is inside the specified namespace.
 819          *
 820          * Please make use of this instead of comparing to getNamespace()
 821          * This function is much more resistant to changes we may make
 822          * to namespaces than code that makes direct comparisons.
 823          * @param $ns int The namespace
 824          * @return bool
 825          * @since 1.19
 826          */
 827         public function inNamespace( $ns ) {
 828                 return MWNamespace::equals( $this->getNamespace(), $ns );
 829         }
 830
 831         /**
 832          * Returns true if the title is inside one of the specified namespaces.
 833          *
 834          * @param ...$namespaces The namespaces to check for
 835          * @return bool
 836          * @since 1.19
 837          */
 838         public function inNamespaces( /* ... */ ) {
 839                 $namespaces = func_get_args();
 840                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 841                         $namespaces = $namespaces[0];
 842                 }
 843
 844                 foreach ( $namespaces as $ns ) {
 845                         if ( $this->inNamespace( $ns ) ) {
 846                                 return true;
 847                         }
 848                 }
 849
 850                 return false;
 851         }
 852
 853         /**
 854          * Returns true if the title has the same subject namespace as the
 855          * namespace specified.
 856          * For example this method will take NS_USER and return true if namespace
 857          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 858          * as their subject namespace.
 859          *
 860          * This is MUCH simpler than individually testing for equivilance
 861          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 862          * @since 1.19
 863          * @param $ns int
 864          * @return bool
 865          */
 866         public function hasSubjectNamespace( $ns ) {
 867                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 868         }
 869
 870         /**
 871          * Is this Title in a namespace which contains content?
 872          * In other words, is this a content page, for the purposes of calculating
 873          * statistics, etc?
 874          *
 875          * @return Boolean
 876          */
 877         public function isContentPage() {
 878                 return MWNamespace::isContent( $this->getNamespace() );
 879         }
 880
 881         /**
 882          * Would anybody with sufficient privileges be able to move this page?
 883          * Some pages just aren't movable.
 884          *
 885          * @return Bool TRUE or FALSE
 886          */
 887         public function isMovable() {
 888                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 889                         // Interwiki title or immovable namespace. Hooks don't get to override here
 890                         return false;
 891                 }
 892
 893                 $result = true;
 894                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 895                 return $result;
 896         }
 897
 898         /**
 899          * Is this the mainpage?
 900          * @note Title::newFromText seams to be sufficiently optimized by the title
 901          * cache that we don't need to over-optimize by doing direct comparisons and
 902          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 903          * ends up reporting something differently than $title->isMainPage();
 904          *
 905          * @since 1.18
 906          * @return Bool
 907          */
 908         public function isMainPage() {
 909                 return $this->equals( Title::newMainPage() );
 910         }
 911
 912         /**
 913          * Is this a subpage?
 914          *
 915          * @return Bool
 916          */
 917         public function isSubpage() {
 918                 return MWNamespace::hasSubpages( $this->mNamespace )
 919                         ? strpos( $this->getText(), '/' ) !== false
 920                         : false;
 921         }
 922
 923         /**
 924          * Is this a conversion table for the LanguageConverter?
 925          *
 926          * @return Bool
 927          */
 928         public function isConversionTable() {
 929                 return $this->getNamespace() == NS_MEDIAWIKI &&
 930                         strpos( $this->getText(), 'Conversiontable' ) !== false;
 931         }
 932
 933         /**
 934          * Does that page contain wikitext, or it is JS, CSS or whatever?
 935          *
 936          * @return Bool
 937          */
 938         public function isWikitextPage() {
 939                 $retval = !$this->isCssOrJsPage() && !$this->isCssJsSubpage();
 940                 wfRunHooks( 'TitleIsWikitextPage', array( $this, &$retval ) );
 941                 return $retval;
 942         }
 943
 944         /**
 945          * Could this page contain custom CSS or JavaScript, based
 946          * on the title?
 947          *
 948          * @return Bool
 949          */
 950         public function isCssOrJsPage() {
 951                 $retval = $this->mNamespace == NS_MEDIAWIKI
 952                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
 953                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$retval ) );
 954                 return $retval;
 955         }
 956
 957         /**
 958          * Is this a .css or .js subpage of a user page?
 959          * @return Bool
 960          */
 961         public function isCssJsSubpage() {
 962                 return ( NS_USER == $this->mNamespace and preg_match( "/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
 963         }
 964
 965         /**
 966          * Trim down a .css or .js subpage title to get the corresponding skin name
 967          *
 968          * @return string containing skin name from .css or .js subpage title
 969          */
 970         public function getSkinFromCssJsSubpage() {
 971                 $subpage = explode( '/', $this->mTextform );
 972                 $subpage = $subpage[ count( $subpage ) - 1 ];
 973                 $lastdot = strrpos( $subpage, '.' );
 974                 if ( $lastdot === false )
 975                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
 976                 return substr( $subpage, 0, $lastdot );
 977         }
 978
 979         /**
 980          * Is this a .css subpage of a user page?
 981          *
 982          * @return Bool
 983          */
 984         public function isCssSubpage() {
 985                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.css$/", $this->mTextform ) );
 986         }
 987
 988         /**
 989          * Is this a .js subpage of a user page?
 990          *
 991          * @return Bool
 992          */
 993         public function isJsSubpage() {
 994                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.js$/", $this->mTextform ) );
 995         }
 996
 997         /**
 998          * Is this a talk page of some sort?
 999          *
1000          * @return Bool
1001          */
1002         public function isTalkPage() {
1003                 return MWNamespace::isTalk( $this->getNamespace() );
1004         }
1005
1006         /**
1007          * Get a Title object associated with the talk page of this article
1008          *
1009          * @return Title the object for the talk page
1010          */
1011         public function getTalkPage() {
1012                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1013         }
1014
1015         /**
1016          * Get a title object associated with the subject page of this
1017          * talk page
1018          *
1019          * @return Title the object for the subject page
1020          */
1021         public function getSubjectPage() {
1022                 // Is this the same title?
1023                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1024                 if ( $this->getNamespace() == $subjectNS ) {
1025                         return $this;
1026                 }
1027                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1028         }
1029
1030         /**
1031          * Get the default namespace index, for when there is no namespace
1032          *
1033          * @return Int Default namespace index
1034          */
1035         public function getDefaultNamespace() {
1036                 return $this->mDefaultNamespace;
1037         }
1038
1039         /**
1040          * Get title for search index
1041          *
1042          * @return String a stripped-down title string ready for the
1043          *  search index
1044          */
1045         public function getIndexTitle() {
1046                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1047         }
1048
1049         /**
1050          * Get the Title fragment (i.e.\ the bit after the #) in text form
1051          *
1052          * @return String Title fragment
1053          */
1054         public function getFragment() {
1055                 return $this->mFragment;
1056         }
1057
1058         /**
1059          * Get the fragment in URL form, including the "#" character if there is one
1060          * @return String Fragment in URL form
1061          */
1062         public function getFragmentForURL() {
1063                 if ( $this->mFragment == '' ) {
1064                         return '';
1065                 } else {
1066                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1067                 }
1068         }
1069
1070         /**
1071          * Set the fragment for this title. Removes the first character from the
1072          * specified fragment before setting, so it assumes you're passing it with
1073          * an initial "#".
1074          *
1075          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1076          * Still in active use privately.
1077          *
1078          * @param $fragment String text
1079          */
1080         public function setFragment( $fragment ) {
1081                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1082         }
1083
1084         /**
1085          * Prefix some arbitrary text with the namespace or interwiki prefix
1086          * of this object
1087          *
1088          * @param $name String the text
1089          * @return String the prefixed text
1090          * @private
1091          */
1092         private function prefix( $name ) {
1093                 $p = '';
1094                 if ( $this->mInterwiki != '' ) {
1095                         $p = $this->mInterwiki . ':';
1096                 }
1097
1098                 if ( 0 != $this->mNamespace ) {
1099                         $p .= $this->getNsText() . ':';
1100                 }
1101                 return $p . $name;
1102         }
1103
1104         /**
1105          * Get the prefixed database key form
1106          *
1107          * @return String the prefixed title, with underscores and
1108          *  any interwiki and namespace prefixes
1109          */
1110         public function getPrefixedDBkey() {
1111                 $s = $this->prefix( $this->mDbkeyform );
1112                 $s = str_replace( ' ', '_', $s );
1113                 return $s;
1114         }
1115
1116         /**
1117          * Get the prefixed title with spaces.
1118          * This is the form usually used for display
1119          *
1120          * @return String the prefixed title, with spaces
1121          */
1122         public function getPrefixedText() {
1123                 // @todo FIXME: Bad usage of empty() ?
1124                 if ( empty( $this->mPrefixedText ) ) {
1125                         $s = $this->prefix( $this->mTextform );
1126                         $s = str_replace( '_', ' ', $s );
1127                         $this->mPrefixedText = $s;
1128                 }
1129                 return $this->mPrefixedText;
1130         }
1131
1132         /**
1133          * Return a string representation of this title
1134          *
1135          * @return String representation of this title
1136          */
1137         public function __toString() {
1138                 return $this->getPrefixedText();
1139         }
1140
1141         /**
1142          * Get the prefixed title with spaces, plus any fragment
1143          * (part beginning with '#')
1144          *
1145          * @return String the prefixed title, with spaces and the fragment, including '#'
1146          */
1147         public function getFullText() {
1148                 $text = $this->getPrefixedText();
1149                 if ( $this->mFragment != '' ) {
1150                         $text .= '#' . $this->mFragment;
1151                 }
1152                 return $text;
1153         }
1154
1155         /**
1156          * Get the base page name, i.e. the leftmost part before any slashes
1157          *
1158          * @return String Base name
1159          */
1160         public function getBaseText() {
1161                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1162                         return $this->getText();
1163                 }
1164
1165                 $parts = explode( '/', $this->getText() );
1166                 # Don't discard the real title if there's no subpage involved
1167                 if ( count( $parts ) > 1 ) {
1168                         unset( $parts[count( $parts ) - 1] );
1169                 }
1170                 return implode( '/', $parts );
1171         }
1172
1173         /**
1174          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1175          *
1176          * @return String Subpage name
1177          */
1178         public function getSubpageText() {
1179                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1180                         return( $this->mTextform );
1181                 }
1182                 $parts = explode( '/', $this->mTextform );
1183                 return( $parts[count( $parts ) - 1] );
1184         }
1185
1186         /**
1187          * Get the HTML-escaped displayable text form.
1188          * Used for the title field in <a> tags.
1189          *
1190          * @return String the text, including any prefixes
1191          */
1192         public function getEscapedText() {
1193                 wfDeprecated( __METHOD__, '1.19' );
1194                 return htmlspecialchars( $this->getPrefixedText() );
1195         }
1196
1197         /**
1198          * Get a URL-encoded form of the subpage text
1199          *
1200          * @return String URL-encoded subpage name
1201          */
1202         public function getSubpageUrlForm() {
1203                 $text = $this->getSubpageText();
1204                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1205                 return( $text );
1206         }
1207
1208         /**
1209          * Get a URL-encoded title (not an actual URL) including interwiki
1210          *
1211          * @return String the URL-encoded form
1212          */
1213         public function getPrefixedURL() {
1214                 $s = $this->prefix( $this->mDbkeyform );
1215                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1216                 return $s;
1217         }
1218
1219         /**
1220          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1221          * get{Canonical,Full,Link,Local}URL methods accepted an optional
1222          * second argument named variant. This was deprecated in favor
1223          * of passing an array of option with a "variant" key
1224          * Once $query2 is removed for good, this helper can be dropped
1225          * andthe wfArrayToCGI moved to getLocalURL();
1226          *
1227          * @since 1.19 (r105919)
1228          * @param $query
1229          * @param $query2 bool
1230          * @return String
1231          */
1232         private static function fixUrlQueryArgs( $query, $query2 = false ) {
1233                 if( $query2 !== false ) {
1234                         wfDeprecated( "Title::get{Canonical,Full,Link,Local} method called with a second parameter is deprecated. Add your parameter to an array passed as the first parameter.", "1.19" );
1235                 }
1236                 if ( is_array( $query ) ) {
1237                         $query = wfArrayToCGI( $query );
1238                 }
1239                 if ( $query2 ) {
1240                         if ( is_string( $query2 ) ) {
1241                                 // $query2 is a string, we will consider this to be
1242                                 // a deprecated $variant argument and add it to the query
1243                                 $query2 = wfArrayToCGI( array( 'variant' => $query2 ) );
1244                         } else {
1245                                 $query2 = wfArrayToCGI( $query2 );
1246                         }
1247                         // If we have $query content add a & to it first
1248                         if ( $query ) {
1249                                 $query .= '&';
1250                         }
1251                         // Now append the queries together
1252                         $query .= $query2;
1253                 }
1254                 return $query;
1255         }
1256
1257         /**
1258          * Get a real URL referring to this title, with interwiki link and
1259          * fragment
1260          *
1261          * See getLocalURL for the arguments.
1262          *
1263          * @see self::getLocalURL
1264          * @return String the URL
1265          */
1266         public function getFullURL( $query = '', $query2 = false ) {
1267                 $query = self::fixUrlQueryArgs( $query, $query2 );
1268
1269                 # Hand off all the decisions on urls to getLocalURL
1270                 $url = $this->getLocalURL( $query );
1271
1272                 # Expand the url to make it a full url. Note that getLocalURL has the
1273                 # potential to output full urls for a variety of reasons, so we use
1274                 # wfExpandUrl instead of simply prepending $wgServer
1275                 $url = wfExpandUrl( $url, PROTO_RELATIVE );
1276
1277                 # Finally, add the fragment.
1278                 $url .= $this->getFragmentForURL();
1279
1280                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1281                 return $url;
1282         }
1283
1284         /**
1285          * Get a URL with no fragment or server name.  If this page is generated
1286          * with action=render, $wgServer is prepended.
1287          *
1288
1289          * @param $query string|array an optional query string,
1290          *   not used for interwiki     links. Can be specified as an associative array as well,
1291          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1292          *   Some query patterns will trigger various shorturl path replacements.
1293          * @param $query2 Mixed: An optional secondary query array. This one MUST
1294          *   be an array. If a string is passed it will be interpreted as a deprecated
1295          *   variant argument and urlencoded into a variant= argument.
1296          *   This second query argument will be added to the $query
1297          *   The second parameter is deprecated since 1.19. Pass it as a key,value
1298          *   pair in the first parameter array instead.
1299          *
1300          * @return String the URL
1301          */
1302         public function getLocalURL( $query = '', $query2 = false ) {
1303                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1304
1305                 $query = self::fixUrlQueryArgs( $query, $query2 );
1306
1307                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1308                 if ( $interwiki ) {
1309                         $namespace = $this->getNsText();
1310                         if ( $namespace != '' ) {
1311                                 # Can this actually happen? Interwikis shouldn't be parsed.
1312                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1313                                 $namespace .= ':';
1314                         }
1315                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1316                         $url = wfAppendQuery( $url, $query );
1317                 } else {
1318                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1319                         if ( $query == '' ) {
1320                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1321                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1322                         } else {
1323                                 global $wgVariantArticlePath, $wgActionPaths;
1324                                 $url = false;
1325                                 $matches = array();
1326
1327                                 if ( !empty( $wgActionPaths ) &&
1328                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1329                                 {
1330                                         $action = urldecode( $matches[2] );
1331                                         if ( isset( $wgActionPaths[$action] ) ) {
1332                                                 $query = $matches[1];
1333                                                 if ( isset( $matches[4] ) ) {
1334                                                         $query .= $matches[4];
1335                                                 }
1336                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1337                                                 if ( $query != '' ) {
1338                                                         $url = wfAppendQuery( $url, $query );
1339                                                 }
1340                                         }
1341                                 }
1342
1343                                 if ( $url === false &&
1344                                         $wgVariantArticlePath &&
1345                                         $this->getPageLanguage()->hasVariants() &&
1346                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1347                                 {
1348                                         $variant = urldecode( $matches[1] );
1349                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1350                                                 // Only do the variant replacement if the given variant is a valid
1351                                                 // variant for the page's language.
1352                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1353                                                 $url = str_replace( '$1', $dbkey, $url );
1354                                         }
1355                                 }
1356
1357                                 if ( $url === false ) {
1358                                         if ( $query == '-' ) {
1359                                                 $query = '';
1360                                         }
1361                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1362                                 }
1363                         }
1364
1365                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1366
1367                         // @todo FIXME: This causes breakage in various places when we
1368                         // actually expected a local URL and end up with dupe prefixes.
1369                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1370                                 $url = $wgServer . $url;
1371                         }
1372                 }
1373                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1374                 return $url;
1375         }
1376
1377         /**
1378          * Get a URL that's the simplest URL that will be valid to link, locally,
1379          * to the current Title.  It includes the fragment, but does not include
1380          * the server unless action=render is used (or the link is external).  If
1381          * there's a fragment but the prefixed text is empty, we just return a link
1382          * to the fragment.
1383          *
1384          * The result obviously should not be URL-escaped, but does need to be
1385          * HTML-escaped if it's being output in HTML.
1386          *
1387          * See getLocalURL for the arguments.
1388          *
1389          * @see self::getLocalURL
1390          * @return String the URL
1391          */
1392         public function getLinkURL( $query = '', $query2 = false ) {
1393                 wfProfileIn( __METHOD__ );
1394                 if ( $this->isExternal() ) {
1395                         $ret = $this->getFullURL( $query, $query2 );
1396                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1397                         $ret = $this->getFragmentForURL();
1398                 } else {
1399                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1400                 }
1401                 wfProfileOut( __METHOD__ );
1402                 return $ret;
1403         }
1404
1405         /**
1406          * Get an HTML-escaped version of the URL form, suitable for
1407          * using in a link, without a server name or fragment
1408          *
1409          * See getLocalURL for the arguments.
1410          *
1411          * @see self::getLocalURL
1412          * @param $query string
1413          * @param $query2 bool|string
1414          * @return String the URL
1415          */
1416         public function escapeLocalURL( $query = '', $query2 = false ) {
1417                 wfDeprecated( __METHOD__, '1.19' );
1418                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1419         }
1420
1421         /**
1422          * Get an HTML-escaped version of the URL form, suitable for
1423          * using in a link, including the server name and fragment
1424          *
1425          * See getLocalURL for the arguments.
1426          *
1427          * @see self::getLocalURL
1428          * @return String the URL
1429          */
1430         public function escapeFullURL( $query = '', $query2 = false ) {
1431                 wfDeprecated( __METHOD__, '1.19' );
1432                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1433         }
1434
1435         /**
1436          * Get the URL form for an internal link.
1437          * - Used in various Squid-related code, in case we have a different
1438          * internal hostname for the server from the exposed one.
1439          *
1440          * This uses $wgInternalServer to qualify the path, or $wgServer
1441          * if $wgInternalServer is not set. If the server variable used is
1442          * protocol-relative, the URL will be expanded to http://
1443          *
1444          * See getLocalURL for the arguments.
1445          *
1446          * @see self::getLocalURL
1447          * @return String the URL
1448          */
1449         public function getInternalURL( $query = '', $query2 = false ) {
1450                 global $wgInternalServer, $wgServer;
1451                 $query = self::fixUrlQueryArgs( $query, $query2 );
1452                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1453                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1454                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1455                 return $url;
1456         }
1457
1458         /**
1459          * Get the URL for a canonical link, for use in things like IRC and
1460          * e-mail notifications. Uses $wgCanonicalServer and the
1461          * GetCanonicalURL hook.
1462          *
1463          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1464          *
1465          * See getLocalURL for the arguments.
1466          *
1467          * @see self::getLocalURL
1468          * @return string The URL
1469          * @since 1.18
1470          */
1471         public function getCanonicalURL( $query = '', $query2 = false ) {
1472                 $query = self::fixUrlQueryArgs( $query, $query2 );
1473                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1474                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1475                 return $url;
1476         }
1477
1478         /**
1479          * HTML-escaped version of getCanonicalURL()
1480          *
1481          * See getLocalURL for the arguments.
1482          *
1483          * @see self::getLocalURL
1484          * @since 1.18
1485          * @return string
1486          */
1487         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1488                 wfDeprecated( __METHOD__, '1.19' );
1489                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1490         }
1491
1492         /**
1493          * Get the edit URL for this Title
1494          *
1495          * @return String the URL, or a null string if this is an
1496          *  interwiki link
1497          */
1498         public function getEditURL() {
1499                 if ( $this->mInterwiki != '' ) {
1500                         return '';
1501                 }
1502                 $s = $this->getLocalURL( 'action=edit' );
1503
1504                 return $s;
1505         }
1506
1507         /**
1508          * Is $wgUser watching this page?
1509          *
1510          * @return Bool
1511          */
1512         public function userIsWatching() {
1513                 global $wgUser;
1514
1515                 if ( is_null( $this->mWatched ) ) {
1516                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1517                                 $this->mWatched = false;
1518                         } else {
1519                                 $this->mWatched = $wgUser->isWatched( $this );
1520                         }
1521                 }
1522                 return $this->mWatched;
1523         }
1524
1525         /**
1526          * Can $wgUser read this page?
1527          *
1528          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1529          * @return Bool
1530          * @todo fold these checks into userCan()
1531          */
1532         public function userCanRead() {
1533                 wfDeprecated( __METHOD__, '1.19' );
1534                 return $this->userCan( 'read' );
1535         }
1536
1537         /**
1538          * Can $user perform $action on this page?
1539          * This skips potentially expensive cascading permission checks
1540          * as well as avoids expensive error formatting
1541          *
1542          * Suitable for use for nonessential UI controls in common cases, but
1543          * _not_ for functional access control.
1544          *
1545          * May provide false positives, but should never provide a false negative.
1546          *
1547          * @param $action String action that permission needs to be checked for
1548          * @param $user User to check (since 1.19); $wgUser will be used if not
1549          *              provided.
1550          * @return Bool
1551          */
1552         public function quickUserCan( $action, $user = null ) {
1553                 return $this->userCan( $action, $user, false );
1554         }
1555
1556         /**
1557          * Can $user perform $action on this page?
1558          *
1559          * @param $action String action that permission needs to be checked for
1560          * @param $user User to check (since 1.19); $wgUser will be used if not
1561          *   provided.
1562          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1563          *   unnecessary queries.
1564          * @return Bool
1565          */
1566         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1567                 if ( !$user instanceof User ) {
1568                         global $wgUser;
1569                         $user = $wgUser;
1570                 }
1571                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1572         }
1573
1574         /**
1575          * Can $user perform $action on this page?
1576          *
1577          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1578          *
1579          * @param $action String action that permission needs to be checked for
1580          * @param $user User to check
1581          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1582          *   queries by skipping checks for cascading protections and user blocks.
1583          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1584          *   whose corresponding errors may be ignored.
1585          * @return Array of arguments to wfMsg to explain permissions problems.
1586          */
1587         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1588                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1589
1590                 // Remove the errors being ignored.
1591                 foreach ( $errors as $index => $error ) {
1592                         $error_key = is_array( $error ) ? $error[0] : $error;
1593
1594                         if ( in_array( $error_key, $ignoreErrors ) ) {
1595                                 unset( $errors[$index] );
1596                         }
1597                 }
1598
1599                 return $errors;
1600         }
1601
1602         /**
1603          * Permissions checks that fail most often, and which are easiest to test.
1604          *
1605          * @param $action String the action to check
1606          * @param $user User user to check
1607          * @param $errors Array list of current errors
1608          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1609          * @param $short Boolean short circuit on first error
1610          *
1611          * @return Array list of errors
1612          */
1613         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1614                 if ( $action == 'create' ) {
1615                         if ( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1616                                  ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1617                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1618                         }
1619                 } elseif ( $action == 'move' ) {
1620                         if ( !$user->isAllowed( 'move-rootuserpages' )
1621                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1622                                 // Show user page-specific message only if the user can move other pages
1623                                 $errors[] = array( 'cant-move-user-page' );
1624                         }
1625
1626                         // Check if user is allowed to move files if it's a file
1627                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1628                                 $errors[] = array( 'movenotallowedfile' );
1629                         }
1630
1631                         if ( !$user->isAllowed( 'move' ) ) {
1632                                 // User can't move anything
1633                                 global $wgGroupPermissions;
1634                                 $userCanMove = false;
1635                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1636                                         $userCanMove = $wgGroupPermissions['user']['move'];
1637                                 }
1638                                 $autoconfirmedCanMove = false;
1639                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1640                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1641                                 }
1642                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1643                                         // custom message if logged-in users without any special rights can move
1644                                         $errors[] = array( 'movenologintext' );
1645                                 } else {
1646                                         $errors[] = array( 'movenotallowed' );
1647                                 }
1648                         }
1649                 } elseif ( $action == 'move-target' ) {
1650                         if ( !$user->isAllowed( 'move' ) ) {
1651                                 // User can't move anything
1652                                 $errors[] = array( 'movenotallowed' );
1653                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1654                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1655                                 // Show user page-specific message only if the user can move other pages
1656                                 $errors[] = array( 'cant-move-to-user-page' );
1657                         }
1658                 } elseif ( !$user->isAllowed( $action ) ) {
1659                         $errors[] = $this->missingPermissionError( $action, $short );
1660                 }
1661
1662                 return $errors;
1663         }
1664
1665         /**
1666          * Add the resulting error code to the errors array
1667          *
1668          * @param $errors Array list of current errors
1669          * @param $result Mixed result of errors
1670          *
1671          * @return Array list of errors
1672          */
1673         private function resultToError( $errors, $result ) {
1674                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1675                         // A single array representing an error
1676                         $errors[] = $result;
1677                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1678                         // A nested array representing multiple errors
1679                         $errors = array_merge( $errors, $result );
1680                 } elseif ( $result !== '' && is_string( $result ) ) {
1681                         // A string representing a message-id
1682                         $errors[] = array( $result );
1683                 } elseif ( $result === false ) {
1684                         // a generic "We don't want them to do that"
1685                         $errors[] = array( 'badaccess-group0' );
1686                 }
1687                 return $errors;
1688         }
1689
1690         /**
1691          * Check various permission hooks
1692          *
1693          * @param $action String the action to check
1694          * @param $user User user to check
1695          * @param $errors Array list of current errors
1696          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1697          * @param $short Boolean short circuit on first error
1698          *
1699          * @return Array list of errors
1700          */
1701         private function checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1702                 // Use getUserPermissionsErrors instead
1703                 $result = '';
1704                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1705                         return $result ? array() : array( array( 'badaccess-group0' ) );
1706                 }
1707                 // Check getUserPermissionsErrors hook
1708                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1709                         $errors = $this->resultToError( $errors, $result );
1710                 }
1711                 // Check getUserPermissionsErrorsExpensive hook
1712                 if ( $doExpensiveQueries && !( $short && count( $errors ) > 0 ) &&
1713                          !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1714                         $errors = $this->resultToError( $errors, $result );
1715                 }
1716
1717                 return $errors;
1718         }
1719
1720         /**
1721          * Check permissions on special pages & namespaces
1722          *
1723          * @param $action String the action to check
1724          * @param $user User user to check
1725          * @param $errors Array list of current errors
1726          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1727          * @param $short Boolean short circuit on first error
1728          *
1729          * @return Array list of errors
1730          */
1731         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1732                 # Only 'createaccount' and 'execute' can be performed on
1733                 # special pages, which don't actually exist in the DB.
1734                 $specialOKActions = array( 'createaccount', 'execute', 'read' );
1735                 if ( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions ) ) {
1736                         $errors[] = array( 'ns-specialprotected' );
1737                 }
1738
1739                 # Check $wgNamespaceProtection for restricted namespaces
1740                 if ( $this->isNamespaceProtected( $user ) ) {
1741                         $ns = $this->mNamespace == NS_MAIN ?
1742                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1743                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1744                                 array( 'protectedinterface' ) : array( 'namespaceprotected',  $ns );
1745                 }
1746
1747                 return $errors;
1748         }
1749
1750         /**
1751          * Check CSS/JS sub-page permissions
1752          *
1753          * @param $action String the action to check
1754          * @param $user User user to check
1755          * @param $errors Array list of current errors
1756          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1757          * @param $short Boolean short circuit on first error
1758          *
1759          * @return Array list of errors
1760          */
1761         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1762                 # Protect css/js subpages of user pages
1763                 # XXX: this might be better using restrictions
1764                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1765                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1766                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1767                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1768                                 $errors[] = array( 'customcssprotected' );
1769                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1770                                 $errors[] = array( 'customjsprotected' );
1771                         }
1772                 }
1773
1774                 return $errors;
1775         }
1776
1777         /**
1778          * Check against page_restrictions table requirements on this
1779          * page. The user must possess all required rights for this
1780          * action.
1781          *
1782          * @param $action String the action to check
1783          * @param $user User user to check
1784          * @param $errors Array list of current errors
1785          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1786          * @param $short Boolean short circuit on first error
1787          *
1788          * @return Array list of errors
1789          */
1790         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1791                 foreach ( $this->getRestrictions( $action ) as $right ) {
1792                         // Backwards compatibility, rewrite sysop -> protect
1793                         if ( $right == 'sysop' ) {
1794                                 $right = 'protect';
1795                         }
1796                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1797                                 // Users with 'editprotected' permission can edit protected pages
1798                                 // without cascading option turned on.
1799                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1800                                         || $this->mCascadeRestriction )
1801                                 {
1802                                         $errors[] = array( 'protectedpagetext', $right );
1803                                 }
1804                         }
1805                 }
1806
1807                 return $errors;
1808         }
1809
1810         /**
1811          * Check restrictions on cascading pages.
1812          *
1813          * @param $action String the action to check
1814          * @param $user User to check
1815          * @param $errors Array list of current errors
1816          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1817          * @param $short Boolean short circuit on first error
1818          *
1819          * @return Array list of errors
1820          */
1821         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1822                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1823                         # We /could/ use the protection level on the source page, but it's
1824                         # fairly ugly as we have to establish a precedence hierarchy for pages
1825                         # included by multiple cascade-protected pages. So just restrict
1826                         # it to people with 'protect' permission, as they could remove the
1827                         # protection anyway.
1828                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1829                         # Cascading protection depends on more than this page...
1830                         # Several cascading protected pages may include this page...
1831                         # Check each cascading level
1832                         # This is only for protection restrictions, not for all actions
1833                         if ( isset( $restrictions[$action] ) ) {
1834                                 foreach ( $restrictions[$action] as $right ) {
1835                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1836                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1837                                                 $pages = '';
1838                                                 foreach ( $cascadingSources as $page )
1839                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1840                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1841                                         }
1842                                 }
1843                         }
1844                 }
1845
1846                 return $errors;
1847         }
1848
1849         /**
1850          * Check action permissions not already checked in checkQuickPermissions
1851          *
1852          * @param $action String the action to check
1853          * @param $user User to check
1854          * @param $errors Array list of current errors
1855          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1856          * @param $short Boolean short circuit on first error
1857          *
1858          * @return Array list of errors
1859          */
1860         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1861                 global $wgDeleteRevisionsLimit, $wgLang;
1862
1863                 if ( $action == 'protect' ) {
1864                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1865                                 // If they can't edit, they shouldn't protect.
1866                                 $errors[] = array( 'protect-cantedit' );
1867                         }
1868                 } elseif ( $action == 'create' ) {
1869                         $title_protection = $this->getTitleProtection();
1870                         if( $title_protection ) {
1871                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1872                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1873                                 }
1874                                 if( $title_protection['pt_create_perm'] == '' ||
1875                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1876                                 {
1877                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1878                                 }
1879                         }
1880                 } elseif ( $action == 'move' ) {
1881                         // Check for immobile pages
1882                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1883                                 // Specific message for this case
1884                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1885                         } elseif ( !$this->isMovable() ) {
1886                                 // Less specific message for rarer cases
1887                                 $errors[] = array( 'immobile-source-page' );
1888                         }
1889                 } elseif ( $action == 'move-target' ) {
1890                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1891                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1892                         } elseif ( !$this->isMovable() ) {
1893                                 $errors[] = array( 'immobile-target-page' );
1894                         }
1895                 } elseif ( $action == 'delete' ) {
1896                         if ( $doExpensiveQueries && $wgDeleteRevisionsLimit
1897                                 && !$this->userCan( 'bigdelete', $user ) && $this->isBigDeletion() )
1898                         {
1899                                 $errors[] = array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) );
1900                         }
1901                 }
1902                 return $errors;
1903         }
1904
1905         /**
1906          * Check that the user isn't blocked from editting.
1907          *
1908          * @param $action String the action to check
1909          * @param $user User to check
1910          * @param $errors Array list of current errors
1911          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1912          * @param $short Boolean short circuit on first error
1913          *
1914          * @return Array list of errors
1915          */
1916         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
1917                 // Account creation blocks handled at userlogin.
1918                 // Unblocking handled in SpecialUnblock
1919                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
1920                         return $errors;
1921                 }
1922
1923                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
1924
1925                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1926                         $errors[] = array( 'confirmedittext' );
1927                 }
1928
1929                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
1930                         // Don't block the user from editing their own talk page unless they've been
1931                         // explicitly blocked from that too.
1932                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
1933                         $block = $user->getBlock();
1934
1935                         // This is from OutputPage::blockedPage
1936                         // Copied at r23888 by werdna
1937
1938                         $id = $user->blockedBy();
1939                         $reason = $user->blockedFor();
1940                         if ( $reason == '' ) {
1941                                 $reason = wfMsg( 'blockednoreason' );
1942                         }
1943                         $ip = $user->getRequest()->getIP();
1944
1945                         if ( is_numeric( $id ) ) {
1946                                 $name = User::whoIs( $id );
1947                         } else {
1948                                 $name = $id;
1949                         }
1950
1951                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1952                         $blockid = $block->getId();
1953                         $blockExpiry = $block->getExpiry();
1954                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $block->mTimestamp ), true );
1955                         if ( $blockExpiry == 'infinity' ) {
1956                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
1957                         } else {
1958                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1959                         }
1960
1961                         $intended = strval( $block->getTarget() );
1962
1963                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
1964                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1965                 }
1966
1967                 return $errors;
1968         }
1969
1970         /**
1971          * Check that the user is allowed to read this page.
1972          *
1973          * @param $action String the action to check
1974          * @param $user User to check
1975          * @param $errors Array list of current errors
1976          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1977          * @param $short Boolean short circuit on first error
1978          *
1979          * @return Array list of errors
1980          */
1981         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1982                 global $wgWhitelistRead, $wgGroupPermissions, $wgRevokePermissions;
1983                 static $useShortcut = null;
1984
1985                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1986                 if ( is_null( $useShortcut ) ) {
1987                         $useShortcut = true;
1988                         if ( empty( $wgGroupPermissions['*']['read'] ) ) {
1989                                 # Not a public wiki, so no shortcut
1990                                 $useShortcut = false;
1991                         } elseif ( !empty( $wgRevokePermissions ) ) {
1992                                 /**
1993                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1994                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1995                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1996                                  * reading is allowed.
1997                                  */
1998                                 foreach ( $wgRevokePermissions as $perms ) {
1999                                         if ( !empty( $perms['read'] ) ) {
2000                                                 # We might be removing the read right from the user, so no shortcut
2001                                                 $useShortcut = false;
2002                                                 break;
2003                                         }
2004                                 }
2005                         }
2006                 }
2007
2008                 $whitelisted = false;
2009                 if ( $useShortcut ) {
2010                         # Shortcut for public wikis, allows skipping quite a bit of code
2011                         $whitelisted = true;
2012                 } elseif ( $user->isAllowed( 'read' ) ) {
2013                         # If the user is allowed to read pages, he is allowed to read all pages
2014                         $whitelisted = true;
2015                 } elseif ( $this->isSpecial( 'Userlogin' )
2016                         || $this->isSpecial( 'ChangePassword' )
2017                         || $this->isSpecial( 'PasswordReset' )
2018                 ) {
2019                         # Always grant access to the login page.
2020                         # Even anons need to be able to log in.
2021                         $whitelisted = true;
2022                 } elseif ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2023                         # Time to check the whitelist
2024                         # Only do these checks is there's something to check against
2025                         $name = $this->getPrefixedText();
2026                         $dbName = $this->getPrefixedDBKey();
2027
2028                         // Check for explicit whitelisting with and without underscores
2029                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2030                                 $whitelisted = true;
2031                         } elseif ( $this->getNamespace() == NS_MAIN ) {
2032                                 # Old settings might have the title prefixed with
2033                                 # a colon for main-namespace pages
2034                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2035                                         $whitelisted = true;
2036                                 }
2037                         } elseif ( $this->isSpecialPage() ) {
2038                                 # If it's a special page, ditch the subpage bit and check again
2039                                 $name = $this->getDBkey();
2040                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2041                                 if ( $name !== false ) {
2042                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2043                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2044                                                 $whitelisted = true;
2045                                         }
2046                                 }
2047                         }
2048                 }
2049
2050                 if ( !$whitelisted ) {
2051                         # If the title is not whitelisted, give extensions a chance to do so...
2052                         wfRunHooks( 'TitleReadWhitelist', array( $this, $user, &$whitelisted ) );
2053                         if ( !$whitelisted ) {
2054                                 $errors[] = $this->missingPermissionError( $action, $short );
2055                         }
2056                 }
2057
2058                 return $errors;
2059         }
2060
2061         /**
2062          * Get a description array when the user doesn't have the right to perform
2063          * $action (i.e. when User::isAllowed() returns false)
2064          *
2065          * @param $action String the action to check
2066          * @param $short Boolean short circuit on first error
2067          * @return Array list of errors
2068          */
2069         private function missingPermissionError( $action, $short ) {
2070                 // We avoid expensive display logic for quickUserCan's and such
2071                 if ( $short ) {
2072                         return array( 'badaccess-group0' );
2073                 }
2074
2075                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2076                         User::getGroupsWithPermission( $action ) );
2077
2078                 if ( count( $groups ) ) {
2079                         global $wgLang;
2080                         return array(
2081                                 'badaccess-groups',
2082                                 $wgLang->commaList( $groups ),
2083                                 count( $groups )
2084                         );
2085                 } else {
2086                         return array( 'badaccess-group0' );
2087                 }
2088         }
2089
2090         /**
2091          * Can $user perform $action on this page? This is an internal function,
2092          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2093          * checks on wfReadOnly() and blocks)
2094          *
2095          * @param $action String action that permission needs to be checked for
2096          * @param $user User to check
2097          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2098          * @param $short Bool Set this to true to stop after the first permission error.
2099          * @return Array of arrays of the arguments to wfMsg to explain permissions problems.
2100          */
2101         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2102                 wfProfileIn( __METHOD__ );
2103
2104                 # Read has special handling
2105                 if ( $action == 'read' ) {
2106                         $checks = array(
2107                                 'checkPermissionHooks',
2108                                 'checkReadPermissions',
2109                         );
2110                 } else {
2111                         $checks = array(
2112                                 'checkQuickPermissions',
2113                                 'checkPermissionHooks',
2114                                 'checkSpecialsAndNSPermissions',
2115                                 'checkCSSandJSPermissions',
2116                                 'checkPageRestrictions',
2117                                 'checkCascadingSourcesRestrictions',
2118                                 'checkActionPermissions',
2119                                 'checkUserBlock'
2120                         );
2121                 }
2122
2123                 $errors = array();
2124                 while( count( $checks ) > 0 &&
2125                                 !( $short && count( $errors ) > 0 ) ) {
2126                         $method = array_shift( $checks );
2127                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2128                 }
2129
2130                 wfProfileOut( __METHOD__ );
2131                 return $errors;
2132         }
2133
2134         /**
2135          * Protect css subpages of user pages: can $wgUser edit
2136          * this page?
2137          *
2138          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2139          * @return Bool
2140          */
2141         public function userCanEditCssSubpage() {
2142                 global $wgUser;
2143                 wfDeprecated( __METHOD__, '1.19' );
2144                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2145                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2146         }
2147
2148         /**
2149          * Protect js subpages of user pages: can $wgUser edit
2150          * this page?
2151          *
2152          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2153          * @return Bool
2154          */
2155         public function userCanEditJsSubpage() {
2156                 global $wgUser;
2157                 wfDeprecated( __METHOD__, '1.19' );
2158                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2159                            || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2160         }
2161
2162         /**
2163          * Get a filtered list of all restriction types supported by this wiki.
2164          * @param bool $exists True to get all restriction types that apply to
2165          * titles that do exist, False for all restriction types that apply to
2166          * titles that do not exist
2167          * @return array
2168          */
2169         public static function getFilteredRestrictionTypes( $exists = true ) {
2170                 global $wgRestrictionTypes;
2171                 $types = $wgRestrictionTypes;
2172                 if ( $exists ) {
2173                         # Remove the create restriction for existing titles
2174                         $types = array_diff( $types, array( 'create' ) );
2175                 } else {
2176                         # Only the create and upload restrictions apply to non-existing titles
2177                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2178                 }
2179                 return $types;
2180         }
2181
2182         /**
2183          * Returns restriction types for the current Title
2184          *
2185          * @return array applicable restriction types
2186          */
2187         public function getRestrictionTypes() {
2188                 if ( $this->isSpecialPage() ) {
2189                         return array();
2190                 }
2191
2192                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2193
2194                 if ( $this->getNamespace() != NS_FILE ) {
2195                         # Remove the upload restriction for non-file titles
2196                         $types = array_diff( $types, array( 'upload' ) );
2197                 }
2198
2199                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2200
2201                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2202                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2203
2204                 return $types;
2205         }
2206
2207         /**
2208          * Is this title subject to title protection?
2209          * Title protection is the one applied against creation of such title.
2210          *
2211          * @return Mixed An associative array representing any existent title
2212          *   protection, or false if there's none.
2213          */
2214         private function getTitleProtection() {
2215                 // Can't protect pages in special namespaces
2216                 if ( $this->getNamespace() < 0 ) {
2217                         return false;
2218                 }
2219
2220                 // Can't protect pages that exist.
2221                 if ( $this->exists() ) {
2222                         return false;
2223                 }
2224
2225                 if ( !isset( $this->mTitleProtection ) ) {
2226                         $dbr = wfGetDB( DB_SLAVE );
2227                         $res = $dbr->select( 'protected_titles', '*',
2228                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2229                                 __METHOD__ );
2230
2231                         // fetchRow returns false if there are no rows.
2232                         $this->mTitleProtection = $dbr->fetchRow( $res );
2233                 }
2234                 return $this->mTitleProtection;
2235         }
2236
2237         /**
2238          * Update the title protection status
2239          *
2240          * @deprecated in 1.19; will be removed in 1.20. Use WikiPage::doUpdateRestrictions() instead.
2241          * @param $create_perm String Permission required for creation
2242          * @param $reason String Reason for protection
2243          * @param $expiry String Expiry timestamp
2244          * @return boolean true
2245          */
2246         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2247                 wfDeprecated( __METHOD__, '1.19' );
2248
2249                 global $wgUser;
2250
2251                 $limit = array( 'create' => $create_perm );
2252                 $expiry = array( 'create' => $expiry );
2253
2254                 $page = WikiPage::factory( $this );
2255                 $status = $page->doUpdateRestrictions( $limit, $expiry, false, $reason, $wgUser );
2256
2257                 return $status->isOK();
2258         }
2259
2260         /**
2261          * Remove any title protection due to page existing
2262          */
2263         public function deleteTitleProtection() {
2264                 $dbw = wfGetDB( DB_MASTER );
2265
2266                 $dbw->delete(
2267                         'protected_titles',
2268                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2269                         __METHOD__
2270                 );
2271                 $this->mTitleProtection = false;
2272         }
2273
2274         /**
2275          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2276          *
2277          * @param $action String Action to check (default: edit)
2278          * @return Bool
2279          */
2280         public function isSemiProtected( $action = 'edit' ) {
2281                 if ( $this->exists() ) {
2282                         $restrictions = $this->getRestrictions( $action );
2283                         if ( count( $restrictions ) > 0 ) {
2284                                 foreach ( $restrictions as $restriction ) {
2285                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2286                                                 return false;
2287                                         }
2288                                 }
2289                         } else {
2290                                 # Not protected
2291                                 return false;
2292                         }
2293                         return true;
2294                 } else {
2295                         # If it doesn't exist, it can't be protected
2296                         return false;
2297                 }
2298         }
2299
2300         /**
2301          * Does the title correspond to a protected article?
2302          *
2303          * @param $action String the action the page is protected from,
2304          * by default checks all actions.
2305          * @return Bool
2306          */
2307         public function isProtected( $action = '' ) {
2308                 global $wgRestrictionLevels;
2309
2310                 $restrictionTypes = $this->getRestrictionTypes();
2311
2312                 # Special pages have inherent protection
2313                 if( $this->isSpecialPage() ) {
2314                         return true;
2315                 }
2316
2317                 # Check regular protection levels
2318                 foreach ( $restrictionTypes as $type ) {
2319                         if ( $action == $type || $action == '' ) {
2320                                 $r = $this->getRestrictions( $type );
2321                                 foreach ( $wgRestrictionLevels as $level ) {
2322                                         if ( in_array( $level, $r ) && $level != '' ) {
2323                                                 return true;
2324                                         }
2325                                 }
2326                         }
2327                 }
2328
2329                 return false;
2330         }
2331
2332         /**
2333          * Determines if $user is unable to edit this page because it has been protected
2334          * by $wgNamespaceProtection.
2335          *
2336          * @param $user User object to check permissions
2337          * @return Bool
2338          */
2339         public function isNamespaceProtected( User $user ) {
2340                 global $wgNamespaceProtection;
2341
2342                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2343                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2344                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2345                                         return true;
2346                                 }
2347                         }
2348                 }
2349                 return false;
2350         }
2351
2352         /**
2353          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2354          *
2355          * @return Bool If the page is subject to cascading restrictions.
2356          */
2357         public function isCascadeProtected() {
2358                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2359                 return ( $sources > 0 );
2360         }
2361
2362         /**
2363          * Cascading protection: Get the source of any cascading restrictions on this page.
2364          *
2365          * @param $getPages Bool Whether or not to retrieve the actual pages
2366          *        that the restrictions have come from.
2367          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2368          *     have come, false for none, or true if such restrictions exist, but $getPages
2369          *     was not set.  The restriction array is an array of each type, each of which
2370          *     contains a array of unique groups.
2371          */
2372         public function getCascadeProtectionSources( $getPages = true ) {
2373                 global $wgContLang;
2374                 $pagerestrictions = array();
2375
2376                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2377                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2378                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2379                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2380                 }
2381
2382                 wfProfileIn( __METHOD__ );
2383
2384                 $dbr = wfGetDB( DB_SLAVE );
2385
2386                 if ( $this->getNamespace() == NS_FILE ) {
2387                         $tables = array( 'imagelinks', 'page_restrictions' );
2388                         $where_clauses = array(
2389                                 'il_to' => $this->getDBkey(),
2390                                 'il_from=pr_page',
2391                                 'pr_cascade' => 1
2392                         );
2393                 } else {
2394                         $tables = array( 'templatelinks', 'page_restrictions' );
2395                         $where_clauses = array(
2396                                 'tl_namespace' => $this->getNamespace(),
2397                                 'tl_title' => $this->getDBkey(),
2398                                 'tl_from=pr_page',
2399                                 'pr_cascade' => 1
2400                         );
2401                 }
2402
2403                 if ( $getPages ) {
2404                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2405                                                    'pr_expiry', 'pr_type', 'pr_level' );
2406                         $where_clauses[] = 'page_id=pr_page';
2407                         $tables[] = 'page';
2408                 } else {
2409                         $cols = array( 'pr_expiry' );
2410                 }
2411
2412                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2413
2414                 $sources = $getPages ? array() : false;
2415                 $now = wfTimestampNow();
2416                 $purgeExpired = false;
2417
2418                 foreach ( $res as $row ) {
2419                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2420                         if ( $expiry > $now ) {
2421                                 if ( $getPages ) {
2422                                         $page_id = $row->pr_page;
2423                                         $page_ns = $row->page_namespace;
2424                                         $page_title = $row->page_title;
2425                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2426                                         # Add groups needed for each restriction type if its not already there
2427                                         # Make sure this restriction type still exists
2428
2429                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2430                                                 $pagerestrictions[$row->pr_type] = array();
2431                                         }
2432
2433                                         if ( isset( $pagerestrictions[$row->pr_type] ) &&
2434                                                  !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] ) ) {
2435                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2436                                         }
2437                                 } else {
2438                                         $sources = true;
2439                                 }
2440                         } else {
2441                                 // Trigger lazy purge of expired restrictions from the db
2442                                 $purgeExpired = true;
2443                         }
2444                 }
2445                 if ( $purgeExpired ) {
2446                         Title::purgeExpiredRestrictions();
2447                 }
2448
2449                 if ( $getPages ) {
2450                         $this->mCascadeSources = $sources;
2451                         $this->mCascadingRestrictions = $pagerestrictions;
2452                 } else {
2453                         $this->mHasCascadingRestrictions = $sources;
2454                 }
2455
2456                 wfProfileOut( __METHOD__ );
2457                 return array( $sources, $pagerestrictions );
2458         }
2459
2460         /**
2461          * Accessor/initialisation for mRestrictions
2462          *
2463          * @param $action String action that permission needs to be checked for
2464          * @return Array of Strings the array of groups allowed to edit this article
2465          */
2466         public function getRestrictions( $action ) {
2467                 if ( !$this->mRestrictionsLoaded ) {
2468                         $this->loadRestrictions();
2469                 }
2470                 return isset( $this->mRestrictions[$action] )
2471                                 ? $this->mRestrictions[$action]
2472                                 : array();
2473         }
2474
2475         /**
2476          * Get the expiry time for the restriction against a given action
2477          *
2478          * @param $action
2479          * @return String|Bool 14-char timestamp, or 'infinity' if the page is protected forever
2480          *     or not protected at all, or false if the action is not recognised.
2481          */
2482         public function getRestrictionExpiry( $action ) {
2483                 if ( !$this->mRestrictionsLoaded ) {
2484                         $this->loadRestrictions();
2485                 }
2486                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2487         }
2488
2489         /**
2490          * Returns cascading restrictions for the current article
2491          *
2492          * @return Boolean
2493          */
2494         function areRestrictionsCascading() {
2495                 if ( !$this->mRestrictionsLoaded ) {
2496                         $this->loadRestrictions();
2497                 }
2498
2499                 return $this->mCascadeRestriction;
2500         }
2501
2502         /**
2503          * Loads a string into mRestrictions array
2504          *
2505          * @param $res Resource restrictions as an SQL result.
2506          * @param $oldFashionedRestrictions String comma-separated list of page
2507          *        restrictions from page table (pre 1.10)
2508          */
2509         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
2510                 $rows = array();
2511
2512                 foreach ( $res as $row ) {
2513                         $rows[] = $row;
2514                 }
2515
2516                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
2517         }
2518
2519         /**
2520          * Compiles list of active page restrictions from both page table (pre 1.10)
2521          * and page_restrictions table for this existing page.
2522          * Public for usage by LiquidThreads.
2523          *
2524          * @param $rows array of db result objects
2525          * @param $oldFashionedRestrictions string comma-separated list of page
2526          *        restrictions from page table (pre 1.10)
2527          */
2528         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
2529                 global $wgContLang;
2530                 $dbr = wfGetDB( DB_SLAVE );
2531
2532                 $restrictionTypes = $this->getRestrictionTypes();
2533
2534                 foreach ( $restrictionTypes as $type ) {
2535                         $this->mRestrictions[$type] = array();
2536                         $this->mRestrictionsExpiry[$type] = $wgContLang->formatExpiry( '', TS_MW );
2537                 }
2538
2539                 $this->mCascadeRestriction = false;
2540
2541                 # Backwards-compatibility: also load the restrictions from the page record (old format).
2542
2543                 if ( $oldFashionedRestrictions === null ) {
2544                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
2545                                 array( 'page_id' => $this->getArticleID() ), __METHOD__ );
2546                 }
2547
2548                 if ( $oldFashionedRestrictions != '' ) {
2549
2550                         foreach ( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
2551                                 $temp = explode( '=', trim( $restrict ) );
2552                                 if ( count( $temp ) == 1 ) {
2553                                         // old old format should be treated as edit/move restriction
2554                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
2555                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
2556                                 } else {
2557                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
2558                                 }
2559                         }
2560
2561                         $this->mOldRestrictions = true;
2562
2563                 }
2564
2565                 if ( count( $rows ) ) {
2566                         # Current system - load second to make them override.
2567                         $now = wfTimestampNow();
2568                         $purgeExpired = false;
2569
2570                         # Cycle through all the restrictions.
2571                         foreach ( $rows as $row ) {
2572
2573                                 // Don't take care of restrictions types that aren't allowed
2574                                 if ( !in_array( $row->pr_type, $restrictionTypes ) )
2575                                         continue;
2576
2577                                 // This code should be refactored, now that it's being used more generally,
2578                                 // But I don't really see any harm in leaving it in Block for now -werdna
2579                                 $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2580
2581                                 // Only apply the restrictions if they haven't expired!
2582                                 if ( !$expiry || $expiry > $now ) {
2583                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
2584                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
2585
2586                                         $this->mCascadeRestriction |= $row->pr_cascade;
2587                                 } else {
2588                                         // Trigger a lazy purge of expired restrictions
2589                                         $purgeExpired = true;
2590                                 }
2591                         }
2592
2593                         if ( $purgeExpired ) {
2594                                 Title::purgeExpiredRestrictions();
2595                         }
2596                 }
2597
2598                 $this->mRestrictionsLoaded = true;
2599         }
2600
2601         /**
2602          * Load restrictions from the page_restrictions table
2603          *
2604          * @param $oldFashionedRestrictions String comma-separated list of page
2605          *        restrictions from page table (pre 1.10)
2606          */
2607         public function loadRestrictions( $oldFashionedRestrictions = null ) {
2608                 global $wgContLang;
2609                 if ( !$this->mRestrictionsLoaded ) {
2610                         if ( $this->exists() ) {
2611                                 $dbr = wfGetDB( DB_SLAVE );
2612
2613                                 $res = $dbr->select(
2614                                         'page_restrictions',
2615                                         '*',
2616                                         array( 'pr_page' => $this->getArticleID() ),
2617                                         __METHOD__
2618                                 );
2619
2620                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2621                         } else {
2622                                 $title_protection = $this->getTitleProtection();
2623
2624                                 if ( $title_protection ) {
2625                                         $now = wfTimestampNow();
2626                                         $expiry = $wgContLang->formatExpiry( $title_protection['pt_expiry'], TS_MW );
2627
2628                                         if ( !$expiry || $expiry > $now ) {
2629                                                 // Apply the restrictions
2630                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2631                                                 $this->mRestrictions['create'] = explode( ',', trim( $title_protection['pt_create_perm'] ) );
2632                                         } else { // Get rid of the old restrictions
2633                                                 Title::purgeExpiredRestrictions();
2634                                                 $this->mTitleProtection = false;
2635                                         }
2636                                 } else {
2637                                         $this->mRestrictionsExpiry['create'] = $wgContLang->formatExpiry( '', TS_MW );
2638                                 }
2639                                 $this->mRestrictionsLoaded = true;
2640                         }
2641                 }
2642         }
2643
2644         /**
2645          * Flush the protection cache in this object and force reload from the database.
2646          * This is used when updating protection from WikiPage::doUpdateRestrictions().
2647          */
2648         public function flushRestrictions() {
2649                 $this->mRestrictionsLoaded = false;
2650                 $this->mTitleProtection = null;
2651         }
2652
2653         /**
2654          * Purge expired restrictions from the page_restrictions table
2655          */
2656         static function purgeExpiredRestrictions() {
2657                 $dbw = wfGetDB( DB_MASTER );
2658                 $dbw->delete(
2659                         'page_restrictions',
2660                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2661                         __METHOD__
2662                 );
2663
2664                 $dbw->delete(
2665                         'protected_titles',
2666                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2667                         __METHOD__
2668                 );
2669         }
2670
2671         /**
2672          * Does this have subpages?  (Warning, usually requires an extra DB query.)
2673          *
2674          * @return Bool
2675          */
2676         public function hasSubpages() {
2677                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
2678                         # Duh
2679                         return false;
2680                 }
2681
2682                 # We dynamically add a member variable for the purpose of this method
2683                 # alone to cache the result.  There's no point in having it hanging
2684                 # around uninitialized in every Title object; therefore we only add it
2685                 # if needed and don't declare it statically.
2686                 if ( isset( $this->mHasSubpages ) ) {
2687                         return $this->mHasSubpages;
2688                 }
2689
2690                 $subpages = $this->getSubpages( 1 );
2691                 if ( $subpages instanceof TitleArray ) {
2692                         return $this->mHasSubpages = (bool)$subpages->count();
2693                 }
2694                 return $this->mHasSubpages = false;
2695         }
2696
2697         /**
2698          * Get all subpages of this page.
2699          *
2700          * @param $limit Int maximum number of subpages to fetch; -1 for no limit
2701          * @return mixed TitleArray, or empty array if this page's namespace
2702          *  doesn't allow subpages
2703          */
2704         public function getSubpages( $limit = -1 ) {
2705                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
2706                         return array();
2707                 }
2708
2709                 $dbr = wfGetDB( DB_SLAVE );
2710                 $conds['page_namespace'] = $this->getNamespace();
2711                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
2712                 $options = array();
2713                 if ( $limit > -1 ) {
2714                         $options['LIMIT'] = $limit;
2715                 }
2716                 return $this->mSubpages = TitleArray::newFromResult(
2717                         $dbr->select( 'page',
2718                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
2719                                 $conds,
2720                                 __METHOD__,
2721                                 $options
2722                         )
2723                 );
2724         }
2725
2726         /**
2727          * Is there a version of this page in the deletion archive?
2728          *
2729          * @return Int the number of archived revisions
2730          */
2731         public function isDeleted() {
2732                 if ( $this->getNamespace() < 0 ) {
2733                         $n = 0;
2734                 } else {
2735                         $dbr = wfGetDB( DB_SLAVE );
2736
2737                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2738                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2739                                 __METHOD__
2740                         );
2741                         if ( $this->getNamespace() == NS_FILE ) {
2742                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2743                                         array( 'fa_name' => $this->getDBkey() ),
2744                                         __METHOD__
2745                                 );
2746                         }
2747                 }
2748                 return (int)$n;
2749         }
2750
2751         /**
2752          * Is there a version of this page in the deletion archive?
2753          *
2754          * @return Boolean
2755          */
2756         public function isDeletedQuick() {
2757                 if ( $this->getNamespace() < 0 ) {
2758                         return false;
2759                 }
2760                 $dbr = wfGetDB( DB_SLAVE );
2761                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2762                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2763                         __METHOD__
2764                 );
2765                 if ( !$deleted && $this->getNamespace() == NS_FILE ) {
2766                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2767                                 array( 'fa_name' => $this->getDBkey() ),
2768                                 __METHOD__
2769                         );
2770                 }
2771                 return $deleted;
2772         }
2773
2774         /**
2775          * Get the article ID for this Title from the link cache,
2776          * adding it if necessary
2777          *
2778          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select
2779          *  for update
2780          * @return Int the ID
2781          */
2782         public function getArticleID( $flags = 0 ) {
2783                 if ( $this->getNamespace() < 0 ) {
2784                         return $this->mArticleID = 0;
2785                 }
2786                 $linkCache = LinkCache::singleton();
2787                 if ( $flags & self::GAID_FOR_UPDATE ) {
2788                         $oldUpdate = $linkCache->forUpdate( true );
2789                         $linkCache->clearLink( $this );
2790                         $this->mArticleID = $linkCache->addLinkObj( $this );
2791                         $linkCache->forUpdate( $oldUpdate );
2792                 } else {
2793                         if ( -1 == $this->mArticleID ) {
2794                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2795                         }
2796                 }
2797                 return $this->mArticleID;
2798         }
2799
2800         /**
2801          * Is this an article that is a redirect page?
2802          * Uses link cache, adding it if necessary
2803          *
2804          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2805          * @return Bool
2806          */
2807         public function isRedirect( $flags = 0 ) {
2808                 if ( !is_null( $this->mRedirect ) ) {
2809                         return $this->mRedirect;
2810                 }
2811                 # Calling getArticleID() loads the field from cache as needed
2812                 if ( !$this->getArticleID( $flags ) ) {
2813                         return $this->mRedirect = false;
2814                 }
2815                 $linkCache = LinkCache::singleton();
2816                 $this->mRedirect = (bool)$linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2817
2818                 return $this->mRedirect;
2819         }
2820
2821         /**
2822          * What is the length of this page?
2823          * Uses link cache, adding it if necessary
2824          *
2825          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2826          * @return Int
2827          */
2828         public function getLength( $flags = 0 ) {
2829                 if ( $this->mLength != -1 ) {
2830                         return $this->mLength;
2831                 }
2832                 # Calling getArticleID() loads the field from cache as needed
2833                 if ( !$this->getArticleID( $flags ) ) {
2834                         return $this->mLength = 0;
2835                 }
2836                 $linkCache = LinkCache::singleton();
2837                 $this->mLength = intval( $linkCache->getGoodLinkFieldObj( $this, 'length' ) );
2838
2839                 return $this->mLength;
2840         }
2841
2842         /**
2843          * What is the page_latest field for this page?
2844          *
2845          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2846          * @return Int or 0 if the page doesn't exist
2847          */
2848         public function getLatestRevID( $flags = 0 ) {
2849                 if ( $this->mLatestID !== false ) {
2850                         return intval( $this->mLatestID );
2851                 }
2852                 # Calling getArticleID() loads the field from cache as needed
2853                 if ( !$this->getArticleID( $flags ) ) {
2854                         return $this->mLatestID = 0;
2855                 }
2856                 $linkCache = LinkCache::singleton();
2857                 $this->mLatestID = intval( $linkCache->getGoodLinkFieldObj( $this, 'revision' ) );
2858
2859                 return $this->mLatestID;
2860         }
2861
2862         /**
2863          * This clears some fields in this object, and clears any associated
2864          * keys in the "bad links" section of the link cache.
2865          *
2866          * - This is called from WikiPage::doEdit() and WikiPage::insertOn() to allow
2867          * loading of the new page_id. It's also called from
2868          * WikiPage::doDeleteArticle()
2869          *
2870          * @param $newid Int the new Article ID
2871          */
2872         public function resetArticleID( $newid ) {
2873                 $linkCache = LinkCache::singleton();
2874                 $linkCache->clearLink( $this );
2875
2876                 if ( $newid === false ) {
2877                         $this->mArticleID = -1;
2878                 } else {
2879                         $this->mArticleID = intval( $newid );
2880                 }
2881                 $this->mRestrictionsLoaded = false;
2882                 $this->mRestrictions = array();
2883                 $this->mRedirect = null;
2884                 $this->mLength = -1;
2885                 $this->mLatestID = false;
2886                 $this->mEstimateRevisions = null;
2887         }
2888
2889         /**
2890          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
2891          *
2892          * @param $text String containing title to capitalize
2893          * @param $ns int namespace index, defaults to NS_MAIN
2894          * @return String containing capitalized title
2895          */
2896         public static function capitalize( $text, $ns = NS_MAIN ) {
2897                 global $wgContLang;
2898
2899                 if ( MWNamespace::isCapitalized( $ns ) ) {
2900                         return $wgContLang->ucfirst( $text );
2901                 } else {
2902                         return $text;
2903                 }
2904         }
2905
2906         /**
2907          * Secure and split - main initialisation function for this object
2908          *
2909          * Assumes that mDbkeyform has been set, and is urldecoded
2910          * and uses underscores, but not otherwise munged.  This function
2911          * removes illegal characters, splits off the interwiki and
2912          * namespace prefixes, sets the other forms, and canonicalizes
2913          * everything.
2914          *
2915          * @return Bool true on success
2916          */
2917         private function secureAndSplit() {
2918                 global $wgContLang, $wgLocalInterwiki;
2919
2920                 # Initialisation
2921                 $this->mInterwiki = $this->mFragment = '';
2922                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2923
2924                 $dbkey = $this->mDbkeyform;
2925
2926                 # Strip Unicode bidi override characters.
2927                 # Sometimes they slip into cut-n-pasted page titles, where the
2928                 # override chars get included in list displays.
2929                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2930
2931                 # Clean up whitespace
2932                 # Note: use of the /u option on preg_replace here will cause
2933                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2934                 # conveniently disabling them.
2935                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2936                 $dbkey = trim( $dbkey, '_' );
2937
2938                 if ( $dbkey == '' ) {
2939                         return false;
2940                 }
2941
2942                 if ( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2943                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2944                         return false;
2945                 }
2946
2947                 $this->mDbkeyform = $dbkey;
2948
2949                 # Initial colon indicates main namespace rather than specified default
2950                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2951                 if ( ':' == $dbkey[0] ) {
2952                         $this->mNamespace = NS_MAIN;
2953                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2954                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2955                 }
2956
2957                 # Namespace or interwiki prefix
2958                 $firstPass = true;
2959                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2960                 do {
2961                         $m = array();
2962                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2963                                 $p = $m[1];
2964                                 if ( ( $ns = $wgContLang->getNsIndex( $p ) ) !== false ) {
2965                                         # Ordinary namespace
2966                                         $dbkey = $m[2];
2967                                         $this->mNamespace = $ns;
2968                                         # For Talk:X pages, check if X has a "namespace" prefix
2969                                         if ( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2970                                                 if ( $wgContLang->getNsIndex( $x[1] ) ) {
2971                                                         # Disallow Talk:File:x type titles...
2972                                                         return false;
2973                                                 } elseif ( Interwiki::isValidInterwiki( $x[1] ) ) {
2974                                                         # Disallow Talk:Interwiki:x type titles...
2975                                                         return false;
2976                                                 }
2977                                         }
2978                                 } elseif ( Interwiki::isValidInterwiki( $p ) ) {
2979                                         if ( !$firstPass ) {
2980                                                 # Can't make a local interwiki link to an interwiki link.
2981                                                 # That's just crazy!
2982                                                 return false;
2983                                         }
2984
2985                                         # Interwiki link
2986                                         $dbkey = $m[2];
2987                                         $this->mInterwiki = $wgContLang->lc( $p );
2988
2989                                         # Redundant interwiki prefix to the local wiki
2990                                         if ( $wgLocalInterwiki !== false
2991                                                 && 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) )
2992                                         {
2993                                                 if ( $dbkey == '' ) {
2994                                                         # Can't have an empty self-link
2995                                                         return false;
2996                                                 }
2997                                                 $this->mInterwiki = '';
2998                                                 $firstPass = false;
2999                                                 # Do another namespace split...
3000                                                 continue;
3001                                         }
3002
3003                                         # If there's an initial colon after the interwiki, that also
3004                                         # resets the default namespace
3005                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
3006                                                 $this->mNamespace = NS_MAIN;
3007                                                 $dbkey = substr( $dbkey, 1 );
3008                                         }
3009                                 }
3010                                 # If there's no recognized interwiki or namespace,
3011                                 # then let the colon expression be part of the title.
3012                         }
3013                         break;
3014                 } while ( true );
3015
3016                 # We already know that some pages won't be in the database!
3017                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
3018                         $this->mArticleID = 0;
3019                 }
3020                 $fragment = strstr( $dbkey, '#' );
3021                 if ( false !== $fragment ) {
3022                         $this->setFragment( $fragment );
3023                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
3024                         # remove whitespace again: prevents "Foo_bar_#"
3025                         # becoming "Foo_bar_"
3026                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
3027                 }
3028
3029                 # Reject illegal characters.
3030                 $rxTc = self::getTitleInvalidRegex();
3031                 if ( preg_match( $rxTc, $dbkey ) ) {
3032                         return false;
3033                 }
3034
3035                 # Pages with "/./" or "/../" appearing in the URLs will often be un-
3036                 # reachable due to the way web browsers deal with 'relative' URLs.
3037                 # Also, they conflict with subpage syntax.  Forbid them explicitly.
3038                 if ( strpos( $dbkey, '.' ) !== false &&
3039                          ( $dbkey === '.' || $dbkey === '..' ||
3040                            strpos( $dbkey, './' ) === 0  ||
3041                            strpos( $dbkey, '../' ) === 0 ||
3042                            strpos( $dbkey, '/./' ) !== false ||
3043                            strpos( $dbkey, '/../' ) !== false  ||
3044                            substr( $dbkey, -2 ) == '/.' ||
3045                            substr( $dbkey, -3 ) == '/..' ) )
3046                 {
3047                         return false;
3048                 }
3049
3050                 # Magic tilde sequences? Nu-uh!
3051                 if ( strpos( $dbkey, '~~~' ) !== false ) {
3052                         return false;
3053                 }
3054
3055                 # Limit the size of titles to 255 bytes. This is typically the size of the
3056                 # underlying database field. We make an exception for special pages, which
3057                 # don't need to be stored in the database, and may edge over 255 bytes due
3058                 # to subpage syntax for long titles, e.g. [[Special:Block/Long name]]
3059                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
3060                   strlen( $dbkey ) > 512 )
3061                 {
3062                         return false;
3063                 }
3064
3065                 # Normally, all wiki links are forced to have an initial capital letter so [[foo]]
3066                 # and [[Foo]] point to the same place.  Don't force it for interwikis, since the
3067                 # other site might be case-sensitive.
3068                 $this->mUserCaseDBKey = $dbkey;
3069                 if ( $this->mInterwiki == '' ) {
3070                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
3071                 }
3072
3073                 # Can't make a link to a namespace alone... "empty" local links can only be
3074                 # self-links with a fragment identifier.
3075                 if ( $dbkey == '' && $this->mInterwiki == '' && $this->mNamespace != NS_MAIN ) {
3076                         return false;
3077                 }
3078
3079                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
3080                 // IP names are not allowed for accounts, and can only be referring to
3081                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
3082                 // there are numerous ways to present the same IP. Having sp:contribs scan
3083                 // them all is silly and having some show the edits and others not is
3084                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
3085                 $dbkey = ( $this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK )
3086                         ? IP::sanitizeIP( $dbkey )
3087                         : $dbkey;
3088
3089                 // Any remaining initial :s are illegal.
3090                 if ( $dbkey !== '' && ':' == $dbkey[0] ) {
3091                         return false;
3092                 }
3093
3094                 # Fill fields
3095                 $this->mDbkeyform = $dbkey;
3096                 $this->mUrlform = wfUrlencode( $dbkey );
3097
3098                 $this->mTextform = str_replace( '_', ' ', $dbkey );
3099
3100                 return true;
3101         }
3102
3103         /**
3104          * Get an array of Title objects linking to this Title
3105          * Also stores the IDs in the link cache.
3106          *
3107          * WARNING: do not use this function on arbitrary user-supplied titles!
3108          * On heavily-used templates it will max out the memory.
3109          *
3110          * @param $options Array: may be FOR UPDATE
3111          * @param $table String: table name
3112          * @param $prefix String: fields prefix
3113          * @return Array of Title objects linking here
3114          */
3115         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3116                 if ( count( $options ) > 0 ) {
3117                         $db = wfGetDB( DB_MASTER );
3118                 } else {
3119                         $db = wfGetDB( DB_SLAVE );
3120                 }
3121
3122                 $res = $db->select(
3123                         array( 'page', $table ),
3124                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3125                         array(
3126                                 "{$prefix}_from=page_id",
3127                                 "{$prefix}_namespace" => $this->getNamespace(),
3128                                 "{$prefix}_title"     => $this->getDBkey() ),
3129                         __METHOD__,
3130                         $options
3131                 );
3132
3133                 $retVal = array();
3134                 if ( $res->numRows() ) {
3135                         $linkCache = LinkCache::singleton();
3136                         foreach ( $res as $row ) {
3137                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
3138                                 if ( $titleObj ) {
3139                                         $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3140                                         $retVal[] = $titleObj;
3141                                 }
3142                         }
3143                 }
3144                 return $retVal;
3145         }
3146
3147         /**
3148          * Get an array of Title objects using this Title as a template
3149          * Also stores the IDs in the link cache.
3150          *
3151          * WARNING: do not use this function on arbitrary user-supplied titles!
3152          * On heavily-used templates it will max out the memory.
3153          *
3154          * @param $options Array: may be FOR UPDATE
3155          * @return Array of Title the Title objects linking here
3156          */
3157         public function getTemplateLinksTo( $options = array() ) {
3158                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
3159         }
3160
3161         /**
3162          * Get an array of Title objects linked from this Title
3163          * Also stores the IDs in the link cache.
3164          *
3165          * WARNING: do not use this function on arbitrary user-supplied titles!
3166          * On heavily-used templates it will max out the memory.
3167          *
3168          * @param $options Array: may be FOR UPDATE
3169          * @param $table String: table name
3170          * @param $prefix String: fields prefix
3171          * @return Array of Title objects linking here
3172          */
3173         public function getLinksFrom( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3174                 $id = $this->getArticleID();
3175
3176                 # If the page doesn't exist; there can't be any link from this page
3177                 if ( !$id ) {
3178                         return array();
3179                 }
3180
3181                 if ( count( $options ) > 0 ) {
3182                         $db = wfGetDB( DB_MASTER );
3183                 } else {
3184                         $db = wfGetDB( DB_SLAVE );
3185                 }
3186
3187                 $namespaceFiled = "{$prefix}_namespace";
3188                 $titleField = "{$prefix}_title";
3189
3190                 $res = $db->select(
3191                         array( $table, 'page' ),
3192                         array( $namespaceFiled, $titleField, 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3193                         array( "{$prefix}_from" => $id ),
3194                         __METHOD__,
3195                         $options,
3196                         array( 'page' => array( 'LEFT JOIN', array( "page_namespace=$namespaceFiled", "page_title=$titleField" ) ) )
3197                 );
3198
3199                 $retVal = array();
3200                 if ( $res->numRows() ) {
3201                         $linkCache = LinkCache::singleton();
3202                         foreach ( $res as $row ) {
3203                                 $titleObj = Title::makeTitle( $row->$namespaceFiled, $row->$titleField );
3204                                 if ( $titleObj ) {
3205                                         if ( $row->page_id ) {
3206                                                 $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3207                                         } else {
3208                                                 $linkCache->addBadLinkObj( $titleObj );
3209                                         }
3210                                         $retVal[] = $titleObj;
3211                                 }
3212                         }
3213                 }
3214                 return $retVal;
3215         }
3216
3217         /**
3218          * Get an array of Title objects used on this Title as a template
3219          * Also stores the IDs in the link cache.
3220          *
3221          * WARNING: do not use this function on arbitrary user-supplied titles!
3222          * On heavily-used templates it will max out the memory.
3223          *
3224          * @param $options Array: may be FOR UPDATE
3225          * @return Array of Title the Title objects used here
3226          */
3227         public function getTemplateLinksFrom( $options = array() ) {
3228                 return $this->getLinksFrom( $options, 'templatelinks', 'tl' );
3229         }
3230
3231         /**
3232          * Get an array of Title objects referring to non-existent articles linked from this page
3233          *
3234          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
3235          * @return Array of Title the Title objects
3236          */
3237         public function getBrokenLinksFrom() {
3238                 if ( $this->getArticleID() == 0 ) {
3239                         # All links from article ID 0 are false positives
3240                         return array();
3241                 }
3242
3243                 $dbr = wfGetDB( DB_SLAVE );
3244                 $res = $dbr->select(
3245                         array( 'page', 'pagelinks' ),
3246                         array( 'pl_namespace', 'pl_title' ),
3247                         array(
3248                                 'pl_from' => $this->getArticleID(),
3249                                 'page_namespace IS NULL'
3250                         ),
3251                         __METHOD__, array(),
3252                         array(
3253                                 'page' => array(
3254                                         'LEFT JOIN',
3255                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
3256                                 )
3257                         )
3258                 );
3259
3260                 $retVal = array();
3261                 foreach ( $res as $row ) {
3262                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
3263                 }
3264                 return $retVal;
3265         }
3266
3267
3268         /**
3269          * Get a list of URLs to purge from the Squid cache when this
3270          * page changes
3271          *
3272          * @return Array of String the URLs
3273          */
3274         public function getSquidURLs() {
3275                 global $wgContLang;
3276
3277                 $urls = array(
3278                         $this->getInternalURL(),
3279                         $this->getInternalURL( 'action=history' )
3280                 );
3281
3282                 // purge variant urls as well
3283                 if ( $wgContLang->hasVariants() ) {
3284                         $variants = $wgContLang->getVariants();
3285                         foreach ( $variants as $vCode ) {
3286                                 $urls[] = $this->getInternalURL( '', $vCode );
3287                         }
3288                 }
3289
3290                 return $urls;
3291         }
3292
3293         /**
3294          * Purge all applicable Squid URLs
3295          */
3296         public function purgeSquid() {
3297                 global $wgUseSquid;
3298                 if ( $wgUseSquid ) {
3299                         $urls = $this->getSquidURLs();
3300                         $u = new SquidUpdate( $urls );
3301                         $u->doUpdate();
3302                 }
3303         }
3304
3305         /**
3306          * Move this page without authentication
3307          *
3308          * @param $nt Title the new page Title
3309          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3310          */
3311         public function moveNoAuth( &$nt ) {
3312                 return $this->moveTo( $nt, false );
3313         }
3314
3315         /**
3316          * Check whether a given move operation would be valid.
3317          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
3318          *
3319          * @param $nt Title the new title
3320          * @param $auth Bool indicates whether $wgUser's permissions
3321          *  should be checked
3322          * @param $reason String is the log summary of the move, used for spam checking
3323          * @return Mixed True on success, getUserPermissionsErrors()-like array on failure
3324          */
3325         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
3326                 global $wgUser;
3327
3328                 $errors = array();
3329                 if ( !$nt ) {
3330                         // Normally we'd add this to $errors, but we'll get
3331                         // lots of syntax errors if $nt is not an object
3332                         return array( array( 'badtitletext' ) );
3333                 }
3334                 if ( $this->equals( $nt ) ) {
3335                         $errors[] = array( 'selfmove' );
3336                 }
3337                 if ( !$this->isMovable() ) {
3338                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
3339                 }
3340                 if ( $nt->getInterwiki() != '' ) {
3341                         $errors[] = array( 'immobile-target-namespace-iw' );
3342                 }
3343                 if ( !$nt->isMovable() ) {
3344                         $errors[] = array( 'immobile-target-namespace', $nt->getNsText() );
3345                 }
3346
3347                 $oldid = $this->getArticleID();
3348                 $newid = $nt->getArticleID();
3349
3350                 if ( strlen( $nt->getDBkey() ) < 1 ) {
3351                         $errors[] = array( 'articleexists' );
3352                 }
3353                 if ( ( $this->getDBkey() == '' ) ||
3354                          ( !$oldid ) ||
3355                          ( $nt->getDBkey() == '' ) ) {
3356                         $errors[] = array( 'badarticleerror' );
3357                 }
3358
3359                 // Image-specific checks
3360                 if ( $this->getNamespace() == NS_FILE ) {
3361                         $errors = array_merge( $errors, $this->validateFileMoveOperation( $nt ) );
3362                 }
3363
3364                 if ( $nt->getNamespace() == NS_FILE && $this->getNamespace() != NS_FILE ) {
3365                         $errors[] = array( 'nonfile-cannot-move-to-file' );
3366                 }
3367
3368                 if ( $auth ) {
3369                         $errors = wfMergeErrorArrays( $errors,
3370                                 $this->getUserPermissionsErrors( 'move', $wgUser ),
3371                                 $this->getUserPermissionsErrors( 'edit', $wgUser ),
3372                                 $nt->getUserPermissionsErrors( 'move-target', $wgUser ),
3373                                 $nt->getUserPermissionsErrors( 'edit', $wgUser ) );
3374                 }
3375
3376                 $match = EditPage::matchSummarySpamRegex( $reason );
3377                 if ( $match !== false ) {
3378                         // This is kind of lame, won't display nice
3379                         $errors[] = array( 'spamprotectiontext' );
3380                 }
3381
3382                 $err = null;
3383                 if ( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
3384                         $errors[] = array( 'hookaborted', $err );
3385                 }
3386
3387                 # The move is allowed only if (1) the target doesn't exist, or
3388                 # (2) the target is a redirect to the source, and has no history
3389                 # (so we can undo bad moves right after they're done).
3390
3391                 if ( 0 != $newid ) { # Target exists; check for validity
3392                         if ( !$this->isValidMoveTarget( $nt ) ) {
3393                                 $errors[] = array( 'articleexists' );
3394                         }
3395                 } else {
3396                         $tp = $nt->getTitleProtection();
3397                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
3398                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
3399                                 $errors[] = array( 'cantmove-titleprotected' );
3400                         }
3401                 }
3402                 if ( empty( $errors ) ) {
3403                         return true;
3404                 }
3405                 return $errors;
3406         }
3407
3408         /**
3409          * Check if the requested move target is a valid file move target
3410          * @param Title $nt Target title
3411          * @return array List of errors
3412          */
3413         protected function validateFileMoveOperation( $nt ) {
3414                 global $wgUser;
3415
3416                 $errors = array();
3417
3418                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is not allowed until below
3419
3420                 $file = wfLocalFile( $this );
3421                 if ( $file->exists() ) {
3422                         if ( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
3423                                 $errors[] = array( 'imageinvalidfilename' );
3424                         }
3425                         if ( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
3426                                 $errors[] = array( 'imagetypemismatch' );
3427                         }
3428                 }
3429
3430                 if ( $nt->getNamespace() != NS_FILE ) {
3431                         $errors[] = array( 'imagenocrossnamespace' );
3432                         // From here we want to do checks on a file object, so if we can't
3433                         // create one, we must return.
3434                         return $errors;
3435                 }
3436
3437                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is allowed below here
3438
3439                 $destFile = wfLocalFile( $nt );
3440                 if ( !$wgUser->isAllowed( 'reupload-shared' ) && !$destFile->exists() && wfFindFile( $nt ) ) {
3441                         $errors[] = array( 'file-exists-sharedrepo' );
3442                 }
3443
3444                 return $errors;
3445         }
3446
3447         /**
3448          * Move a title to a new location
3449          *
3450          * @param $nt Title the new title
3451          * @param $auth Bool indicates whether $wgUser's permissions
3452          *  should be checked
3453          * @param $reason String the reason for the move
3454          * @param $createRedirect Bool Whether to create a redirect from the old title to the new title.
3455          *  Ignored if the user doesn't have the suppressredirect right.
3456          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3457          */
3458         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
3459                 global $wgUser;
3460                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
3461                 if ( is_array( $err ) ) {
3462                         // Auto-block user's IP if the account was "hard" blocked
3463                         $wgUser->spreadAnyEditBlock();
3464                         return $err;
3465                 }
3466
3467                 // If it is a file, move it first.
3468                 // It is done before all other moving stuff is done because it's hard to revert.
3469                 $dbw = wfGetDB( DB_MASTER );
3470                 if ( $this->getNamespace() == NS_FILE ) {
3471                         $file = wfLocalFile( $this );
3472                         if ( $file->exists() ) {
3473                                 $status = $file->move( $nt );
3474                                 if ( !$status->isOk() ) {
3475                                         return $status->getErrorsArray();
3476                                 }
3477                         }
3478                         // Clear RepoGroup process cache
3479                         RepoGroup::singleton()->clearCache( $this );
3480                         RepoGroup::singleton()->clearCache( $nt ); # clear false negative cache
3481                 }
3482
3483                 $dbw->begin( __METHOD__ ); # If $file was a LocalFile, its transaction would have closed our own.
3484                 $pageid = $this->getArticleID( self::GAID_FOR_UPDATE );
3485                 $protected = $this->isProtected();
3486
3487                 // Do the actual move
3488                 $err = $this->moveToInternal( $nt, $reason, $createRedirect );
3489                 if ( is_array( $err ) ) {
3490                         # @todo FIXME: What about the File we have already moved?
3491                         $dbw->rollback( __METHOD__ );
3492                         return $err;
3493                 }
3494
3495                 // Refresh the sortkey for this row.  Be careful to avoid resetting
3496                 // cl_timestamp, which may disturb time-based lists on some sites.
3497                 $prefixes = $dbw->select(
3498                         'categorylinks',
3499                         array( 'cl_sortkey_prefix', 'cl_to' ),
3500                         array( 'cl_from' => $pageid ),
3501                         __METHOD__
3502                 );
3503                 foreach ( $prefixes as $prefixRow ) {
3504                         $prefix = $prefixRow->cl_sortkey_prefix;
3505                         $catTo = $prefixRow->cl_to;
3506                         $dbw->update( 'categorylinks',
3507                                 array(
3508                                         'cl_sortkey' => Collation::singleton()->getSortKey(
3509                                                 $nt->getCategorySortkey( $prefix ) ),
3510                                         'cl_timestamp=cl_timestamp' ),
3511                                 array(
3512                                         'cl_from' => $pageid,
3513                                         'cl_to' => $catTo ),
3514                                 __METHOD__
3515                         );
3516                 }
3517
3518                 $redirid = $this->getArticleID();
3519
3520                 if ( $protected ) {
3521                         # Protect the redirect title as the title used to be...
3522                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
3523                                 array(
3524                                         'pr_page'    => $redirid,
3525                                         'pr_type'    => 'pr_type',
3526                                         'pr_level'   => 'pr_level',
3527                                         'pr_cascade' => 'pr_cascade',
3528                                         'pr_user'    => 'pr_user',
3529                                         'pr_expiry'  => 'pr_expiry'
3530                                 ),
3531                                 array( 'pr_page' => $pageid ),
3532                                 __METHOD__,
3533                                 array( 'IGNORE' )
3534                         );
3535                         # Update the protection log
3536                         $log = new LogPage( 'protect' );
3537                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3538                         if ( $reason ) {
3539                                 $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3540                         }
3541                         // @todo FIXME: $params?
3542                         $log->addEntry( 'move_prot', $nt, $comment, array( $this->getPrefixedText() ) );
3543                 }
3544
3545                 # Update watchlists
3546                 $oldnamespace = $this->getNamespace() & ~1;
3547                 $newnamespace = $nt->getNamespace() & ~1;
3548                 $oldtitle = $this->getDBkey();
3549                 $newtitle = $nt->getDBkey();
3550
3551                 if ( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
3552                         WatchedItem::duplicateEntries( $this, $nt );
3553                 }
3554
3555                 $dbw->commit( __METHOD__ );
3556
3557                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
3558                 return true;
3559         }
3560
3561         /**
3562          * Move page to a title which is either a redirect to the
3563          * source page or nonexistent
3564          *
3565          * @param $nt Title the page to move to, which should be a redirect or nonexistent
3566          * @param $reason String The reason for the move
3567          * @param $createRedirect Bool Whether to leave a redirect at the old title.  Ignored
3568          *   if the user doesn't have the suppressredirect right
3569          */
3570         private function moveToInternal( &$nt, $reason = '', $createRedirect = true ) {
3571                 global $wgUser, $wgContLang;
3572
3573                 if ( $nt->exists() ) {
3574                         $moveOverRedirect = true;
3575                         $logType = 'move_redir';
3576                 } else {
3577                         $moveOverRedirect = false;
3578                         $logType = 'move';
3579                 }
3580
3581                 $redirectSuppressed = !$createRedirect && $wgUser->isAllowed( 'suppressredirect' );
3582
3583                 $logEntry = new ManualLogEntry( 'move', $logType );
3584                 $logEntry->setPerformer( $wgUser );
3585                 $logEntry->setTarget( $this );
3586                 $logEntry->setComment( $reason );
3587                 $logEntry->setParameters( array(
3588                         '4::target' => $nt->getPrefixedText(),
3589                         '5::noredir' => $redirectSuppressed ? '1': '0',
3590                 ) );
3591
3592                 $formatter = LogFormatter::newFromEntry( $logEntry );
3593                 $formatter->setContext( RequestContext::newExtraneousContext( $this ) );
3594                 $comment = $formatter->getPlainActionText();
3595                 if ( $reason ) {
3596                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3597                 }
3598                 # Truncate for whole multibyte characters.
3599                 $comment = $wgContLang->truncate( $comment, 255 );
3600
3601                 $oldid = $this->getArticleID();
3602
3603                 $dbw = wfGetDB( DB_MASTER );
3604
3605                 $newpage = WikiPage::factory( $nt );
3606
3607                 if ( $moveOverRedirect ) {
3608                         $newid = $nt->getArticleID();
3609
3610                         # Delete the old redirect. We don't save it to history since
3611                         # by definition if we've got here it's rather uninteresting.
3612                         # We have to remove it so that the next step doesn't trigger
3613                         # a conflict on the unique namespace+title index...
3614                         $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
3615
3616                         $newpage->doDeleteUpdates( $newid );
3617                 }
3618
3619                 # Save a null revision in the page's history notifying of the move
3620                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3621                 if ( !is_object( $nullRevision ) ) {
3622                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3623                 }
3624                 $nullRevId = $nullRevision->insertOn( $dbw );
3625
3626                 # Change the name of the target page:
3627                 $dbw->update( 'page',
3628                         /* SET */ array(
3629                                 'page_namespace' => $nt->getNamespace(),
3630                                 'page_title'     => $nt->getDBkey(),
3631                         ),
3632                         /* WHERE */ array( 'page_id' => $oldid ),
3633                         __METHOD__
3634                 );
3635
3636                 $this->resetArticleID( 0 );
3637                 $nt->resetArticleID( $oldid );
3638
3639                 $newpage->updateRevisionOn( $dbw, $nullRevision );
3640
3641                 wfRunHooks( 'NewRevisionFromEditComplete',
3642                         array( $newpage, $nullRevision, $nullRevision->getParentId(), $wgUser ) );
3643
3644                 $newpage->doEditUpdates( $nullRevision, $wgUser, array( 'changed' => false ) );
3645
3646                 if ( !$moveOverRedirect ) {
3647                         WikiPage::onArticleCreate( $nt );
3648                 }
3649
3650                 # Recreate the redirect, this time in the other direction.
3651                 if ( $redirectSuppressed ) {
3652                         WikiPage::onArticleDelete( $this );
3653                 } else {
3654                         $mwRedir = MagicWord::get( 'redirect' );
3655                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3656                         $redirectArticle = WikiPage::factory( $this );
3657                         $newid = $redirectArticle->insertOn( $dbw );
3658                         if ( $newid ) { // sanity
3659                                 $redirectRevision = new Revision( array(
3660                                         'page'    => $newid,
3661                                         'comment' => $comment,
3662                                         'text'    => $redirectText ) );
3663                                 $redirectRevision->insertOn( $dbw );
3664                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3665
3666                                 wfRunHooks( 'NewRevisionFromEditComplete',
3667                                         array( $redirectArticle, $redirectRevision, false, $wgUser ) );
3668
3669                                 $redirectArticle->doEditUpdates( $redirectRevision, $wgUser, array( 'created' => true ) );
3670                         }
3671                 }
3672
3673                 # Log the move
3674                 $logid = $logEntry->insert();
3675                 $logEntry->publish( $logid );
3676         }
3677
3678         /**
3679          * Move this page's subpages to be subpages of $nt
3680          *
3681          * @param $nt Title Move target
3682          * @param $auth bool Whether $wgUser's permissions should be checked
3683          * @param $reason string The reason for the move
3684          * @param $createRedirect bool Whether to create redirects from the old subpages to
3685          *     the new ones Ignored if the user doesn't have the 'suppressredirect' right
3686          * @return mixed array with old page titles as keys, and strings (new page titles) or
3687          *     arrays (errors) as values, or an error array with numeric indices if no pages
3688          *     were moved
3689          */
3690         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3691                 global $wgMaximumMovedPages;
3692                 // Check permissions
3693                 if ( !$this->userCan( 'move-subpages' ) ) {
3694                         return array( 'cant-move-subpages' );
3695                 }
3696                 // Do the source and target namespaces support subpages?
3697                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
3698                         return array( 'namespace-nosubpages',
3699                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3700                 }
3701                 if ( !MWNamespace::hasSubpages( $nt->getNamespace() ) ) {
3702                         return array( 'namespace-nosubpages',
3703                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3704                 }
3705
3706                 $subpages = $this->getSubpages( $wgMaximumMovedPages + 1 );
3707                 $retval = array();
3708                 $count = 0;
3709                 foreach ( $subpages as $oldSubpage ) {
3710                         $count++;
3711                         if ( $count > $wgMaximumMovedPages ) {
3712                                 $retval[$oldSubpage->getPrefixedTitle()] =
3713                                                 array( 'movepage-max-pages',
3714                                                         $wgMaximumMovedPages );
3715                                 break;
3716                         }
3717
3718                         // We don't know whether this function was called before
3719                         // or after moving the root page, so check both
3720                         // $this and $nt
3721                         if ( $oldSubpage->getArticleID() == $this->getArticleID() ||
3722                                         $oldSubpage->getArticleID() == $nt->getArticleID() )
3723                         {
3724                                 // When moving a page to a subpage of itself,
3725                                 // don't move it twice
3726                                 continue;
3727                         }
3728                         $newPageName = preg_replace(
3729                                         '#^' . preg_quote( $this->getDBkey(), '#' ) . '#',
3730                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3731                                         $oldSubpage->getDBkey() );
3732                         if ( $oldSubpage->isTalkPage() ) {
3733                                 $newNs = $nt->getTalkPage()->getNamespace();
3734                         } else {
3735                                 $newNs = $nt->getSubjectPage()->getNamespace();
3736                         }
3737                         # Bug 14385: we need makeTitleSafe because the new page names may
3738                         # be longer than 255 characters.
3739                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3740
3741                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3742                         if ( $success === true ) {
3743                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3744                         } else {
3745                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3746                         }
3747                 }
3748                 return $retval;
3749         }
3750
3751         /**
3752          * Checks if this page is just a one-rev redirect.
3753          * Adds lock, so don't use just for light purposes.
3754          *
3755          * @return Bool
3756          */
3757         public function isSingleRevRedirect() {
3758                 $dbw = wfGetDB( DB_MASTER );
3759                 # Is it a redirect?
3760                 $row = $dbw->selectRow( 'page',
3761                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3762                         $this->pageCond(),
3763                         __METHOD__,
3764                         array( 'FOR UPDATE' )
3765                 );
3766                 # Cache some fields we may want
3767                 $this->mArticleID = $row ? intval( $row->page_id ) : 0;
3768                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3769                 $this->mLatestID = $row ? intval( $row->page_latest ) : false;
3770                 if ( !$this->mRedirect ) {
3771                         return false;
3772                 }
3773                 # Does the article have a history?
3774                 $row = $dbw->selectField( array( 'page', 'revision' ),
3775                         'rev_id',
3776                         array( 'page_namespace' => $this->getNamespace(),
3777                                 'page_title' => $this->getDBkey(),
3778                                 'page_id=rev_page',
3779                                 'page_latest != rev_id'
3780                         ),
3781                         __METHOD__,
3782                         array( 'FOR UPDATE' )
3783                 );
3784                 # Return true if there was no history
3785                 return ( $row === false );
3786         }
3787
3788         /**
3789          * Checks if $this can be moved to a given Title
3790          * - Selects for update, so don't call it unless you mean business
3791          *
3792          * @param $nt Title the new title to check
3793          * @return Bool
3794          */
3795         public function isValidMoveTarget( $nt ) {
3796                 # Is it an existing file?
3797                 if ( $nt->getNamespace() == NS_FILE ) {
3798                         $file = wfLocalFile( $nt );
3799                         if ( $file->exists() ) {
3800                                 wfDebug( __METHOD__ . ": file exists\n" );
3801                                 return false;
3802                         }
3803                 }
3804                 # Is it a redirect with no history?
3805                 if ( !$nt->isSingleRevRedirect() ) {
3806                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3807                         return false;
3808                 }
3809                 # Get the article text
3810                 $rev = Revision::newFromTitle( $nt );
3811                 if( !is_object( $rev ) ){
3812                         return false;
3813                 }
3814                 $text = $rev->getText();
3815                 # Does the redirect point to the source?
3816                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3817                 $m = array();
3818                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
3819                         $redirTitle = Title::newFromText( $m[1] );
3820                         if ( !is_object( $redirTitle ) ||
3821                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3822                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
3823                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3824                                 return false;
3825                         }
3826                 } else {
3827                         # Fail safe
3828                         wfDebug( __METHOD__ . ": failsafe\n" );
3829                         return false;
3830                 }
3831                 return true;
3832         }
3833
3834         /**
3835          * Get categories to which this Title belongs and return an array of
3836          * categories' names.
3837          *
3838          * @return Array of parents in the form:
3839          *        $parent => $currentarticle
3840          */
3841         public function getParentCategories() {
3842                 global $wgContLang;
3843
3844                 $data = array();
3845
3846                 $titleKey = $this->getArticleID();
3847
3848                 if ( $titleKey === 0 ) {
3849                         return $data;
3850                 }
3851
3852                 $dbr = wfGetDB( DB_SLAVE );
3853
3854                 $res = $dbr->select( 'categorylinks', '*',
3855                         array(
3856                                 'cl_from' => $titleKey,
3857                         ),
3858                         __METHOD__,
3859                         array()
3860                 );
3861
3862                 if ( $dbr->numRows( $res ) > 0 ) {
3863                         foreach ( $res as $row ) {
3864                                 // $data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3865                                 $data[$wgContLang->getNSText( NS_CATEGORY ) . ':' . $row->cl_to] = $this->getFullText();
3866                         }
3867                 }
3868                 return $data;
3869         }
3870
3871         /**
3872          * Get a tree of parent categories
3873          *
3874          * @param $children Array with the children in the keys, to check for circular refs
3875          * @return Array Tree of parent categories
3876          */
3877         public function getParentCategoryTree( $children = array() ) {
3878                 $stack = array();
3879                 $parents = $this->getParentCategories();
3880
3881                 if ( $parents ) {
3882                         foreach ( $parents as $parent => $current ) {
3883                                 if ( array_key_exists( $parent, $children ) ) {
3884                                         # Circular reference
3885                                         $stack[$parent] = array();
3886                                 } else {
3887                                         $nt = Title::newFromText( $parent );
3888                                         if ( $nt ) {
3889                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array( $parent => 1 ) );
3890                                         }
3891                                 }
3892                         }
3893                 }
3894
3895                 return $stack;
3896         }
3897
3898         /**
3899          * Get an associative array for selecting this title from
3900          * the "page" table
3901          *
3902          * @return Array suitable for the $where parameter of DB::select()
3903          */
3904         public function pageCond() {
3905                 if ( $this->mArticleID > 0 ) {
3906                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3907                         return array( 'page_id' => $this->mArticleID );
3908                 } else {
3909                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3910                 }
3911         }
3912
3913         /**
3914          * Get the revision ID of the previous revision
3915          *
3916          * @param $revId Int Revision ID. Get the revision that was before this one.
3917          * @param $flags Int Title::GAID_FOR_UPDATE
3918          * @return Int|Bool Old revision ID, or FALSE if none exists
3919          */
3920         public function getPreviousRevisionID( $revId, $flags = 0 ) {
3921                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3922                 return $db->selectField( 'revision', 'rev_id',
3923                         array(
3924                                 'rev_page' => $this->getArticleID( $flags ),
3925                                 'rev_id < ' . intval( $revId )
3926                         ),
3927                         __METHOD__,
3928                         array( 'ORDER BY' => 'rev_id DESC' )
3929                 );
3930         }
3931
3932         /**
3933          * Get the revision ID of the next revision
3934          *
3935          * @param $revId Int Revision ID. Get the revision that was after this one.
3936          * @param $flags Int Title::GAID_FOR_UPDATE
3937          * @return Int|Bool Next revision ID, or FALSE if none exists
3938          */
3939         public function getNextRevisionID( $revId, $flags = 0 ) {
3940                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3941                 return $db->selectField( 'revision', 'rev_id',
3942                         array(
3943                                 'rev_page' => $this->getArticleID( $flags ),
3944                                 'rev_id > ' . intval( $revId )
3945                         ),
3946                         __METHOD__,
3947                         array( 'ORDER BY' => 'rev_id' )
3948                 );
3949         }
3950
3951         /**
3952          * Get the first revision of the page
3953          *
3954          * @param $flags Int Title::GAID_FOR_UPDATE
3955          * @return Revision|Null if page doesn't exist
3956          */
3957         public function getFirstRevision( $flags = 0 ) {
3958                 $pageId = $this->getArticleID( $flags );
3959                 if ( $pageId ) {
3960                         $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3961                         $row = $db->selectRow( 'revision', '*',
3962                                 array( 'rev_page' => $pageId ),
3963                                 __METHOD__,
3964                                 array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3965                         );
3966                         if ( $row ) {
3967                                 return new Revision( $row );
3968                         }
3969                 }
3970                 return null;
3971         }
3972
3973         /**
3974          * Get the oldest revision timestamp of this page
3975          *
3976          * @param $flags Int Title::GAID_FOR_UPDATE
3977          * @return String: MW timestamp
3978          */
3979         public function getEarliestRevTime( $flags = 0 ) {
3980                 $rev = $this->getFirstRevision( $flags );
3981                 return $rev ? $rev->getTimestamp() : null;
3982         }
3983
3984         /**
3985          * Check if this is a new page
3986          *
3987          * @return bool
3988          */
3989         public function isNewPage() {
3990                 $dbr = wfGetDB( DB_SLAVE );
3991                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
3992         }
3993
3994         /**
3995          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
3996          *
3997          * @return bool
3998          */
3999         public function isBigDeletion() {
4000                 global $wgDeleteRevisionsLimit;
4001
4002                 if ( !$wgDeleteRevisionsLimit ) {
4003                         return false;
4004                 }
4005
4006                 $revCount = $this->estimateRevisionCount();
4007                 return $revCount > $wgDeleteRevisionsLimit;
4008         }
4009
4010         /**
4011          * Get the  approximate revision count of this page.
4012          *
4013          * @return int
4014          */
4015         public function estimateRevisionCount() {
4016                 if ( !$this->exists() ) {
4017                         return 0;
4018                 }
4019
4020                 if ( $this->mEstimateRevisions === null ) {
4021                         $dbr = wfGetDB( DB_SLAVE );
4022                         $this->mEstimateRevisions = $dbr->estimateRowCount( 'revision', '*',
4023                                 array( 'rev_page' => $this->getArticleID() ), __METHOD__ );
4024                 }
4025
4026                 return $this->mEstimateRevisions;
4027         }
4028
4029         /**
4030          * Get the number of revisions between the given revision.
4031          * Used for diffs and other things that really need it.
4032          *
4033          * @param $old int|Revision Old revision or rev ID (first before range)
4034          * @param $new int|Revision New revision or rev ID (first after range)
4035          * @return Int Number of revisions between these revisions.
4036          */
4037         public function countRevisionsBetween( $old, $new ) {
4038                 if ( !( $old instanceof Revision ) ) {
4039                         $old = Revision::newFromTitle( $this, (int)$old );
4040                 }
4041                 if ( !( $new instanceof Revision ) ) {
4042                         $new = Revision::newFromTitle( $this, (int)$new );
4043                 }
4044                 if ( !$old || !$new ) {
4045                         return 0; // nothing to compare
4046                 }
4047                 $dbr = wfGetDB( DB_SLAVE );
4048                 return (int)$dbr->selectField( 'revision', 'count(*)',
4049                         array(
4050                                 'rev_page' => $this->getArticleID(),
4051                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4052                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4053                         ),
4054                         __METHOD__
4055                 );
4056         }
4057
4058         /**
4059          * Get the number of authors between the given revision IDs.
4060          * Used for diffs and other things that really need it.
4061          *
4062          * @param $old int|Revision Old revision or rev ID (first before range)
4063          * @param $new int|Revision New revision or rev ID (first after range)
4064          * @param $limit Int Maximum number of authors
4065          * @return Int Number of revision authors between these revisions.
4066          */
4067         public function countAuthorsBetween( $old, $new, $limit ) {
4068                 if ( !( $old instanceof Revision ) ) {
4069                         $old = Revision::newFromTitle( $this, (int)$old );
4070                 }
4071                 if ( !( $new instanceof Revision ) ) {
4072                         $new = Revision::newFromTitle( $this, (int)$new );
4073                 }
4074                 if ( !$old || !$new ) {
4075                         return 0; // nothing to compare
4076                 }
4077                 $dbr = wfGetDB( DB_SLAVE );
4078                 $res = $dbr->select( 'revision', 'DISTINCT rev_user_text',
4079                         array(
4080                                 'rev_page' => $this->getArticleID(),
4081                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4082                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4083                         ), __METHOD__,
4084                         array( 'LIMIT' => $limit + 1 ) // add one so caller knows it was truncated
4085                 );
4086                 return (int)$dbr->numRows( $res );
4087         }
4088
4089         /**
4090          * Compare with another title.
4091          *
4092          * @param $title Title
4093          * @return Bool
4094          */
4095         public function equals( Title $title ) {
4096                 // Note: === is necessary for proper matching of number-like titles.
4097                 return $this->getInterwiki() === $title->getInterwiki()
4098                         && $this->getNamespace() == $title->getNamespace()
4099                         && $this->getDBkey() === $title->getDBkey();
4100         }
4101
4102         /**
4103          * Check if this title is a subpage of another title
4104          *
4105          * @param $title Title
4106          * @return Bool
4107          */
4108         public function isSubpageOf( Title $title ) {
4109                 return $this->getInterwiki() === $title->getInterwiki()
4110                         && $this->getNamespace() == $title->getNamespace()
4111                         && strpos( $this->getDBkey(), $title->getDBkey() . '/' ) === 0;
4112         }
4113
4114         /**
4115          * Check if page exists.  For historical reasons, this function simply
4116          * checks for the existence of the title in the page table, and will
4117          * thus return false for interwiki links, special pages and the like.
4118          * If you want to know if a title can be meaningfully viewed, you should
4119          * probably call the isKnown() method instead.
4120          *
4121          * @return Bool
4122          */
4123         public function exists() {
4124                 return $this->getArticleID() != 0;
4125         }
4126
4127         /**
4128          * Should links to this title be shown as potentially viewable (i.e. as
4129          * "bluelinks"), even if there's no record by this title in the page
4130          * table?
4131          *
4132          * This function is semi-deprecated for public use, as well as somewhat
4133          * misleadingly named.  You probably just want to call isKnown(), which
4134          * calls this function internally.
4135          *
4136          * (ISSUE: Most of these checks are cheap, but the file existence check
4137          * can potentially be quite expensive.  Including it here fixes a lot of
4138          * existing code, but we might want to add an optional parameter to skip
4139          * it and any other expensive checks.)
4140          *
4141          * @return Bool
4142          */
4143         public function isAlwaysKnown() {
4144                 $isKnown = null;
4145
4146                 /**
4147                  * Allows overriding default behaviour for determining if a page exists.
4148                  * If $isKnown is kept as null, regular checks happen. If it's
4149                  * a boolean, this value is returned by the isKnown method.
4150                  *
4151                  * @since 1.20
4152                  *
4153                  * @param Title $title
4154                  * @param boolean|null $isKnown
4155                  */
4156                 wfRunHooks( 'TitleIsAlwaysKnown', array( $this, &$isKnown ) );
4157
4158                 if ( !is_null( $isKnown ) ) {
4159                         return $isKnown;
4160                 }
4161
4162                 if ( $this->mInterwiki != '' ) {
4163                         return true;  // any interwiki link might be viewable, for all we know
4164                 }
4165
4166                 switch( $this->mNamespace ) {
4167                         case NS_MEDIA:
4168                         case NS_FILE:
4169                                 // file exists, possibly in a foreign repo
4170                                 return (bool)wfFindFile( $this );
4171                         case NS_SPECIAL:
4172                                 // valid special page
4173                                 return SpecialPageFactory::exists( $this->getDBkey() );
4174                         case NS_MAIN:
4175                                 // selflink, possibly with fragment
4176                                 return $this->mDbkeyform == '';
4177                         case NS_MEDIAWIKI:
4178                                 // known system message
4179                                 return $this->hasSourceText() !== false;
4180                         default:
4181                                 return false;
4182                 }
4183         }
4184
4185         /**
4186          * Does this title refer to a page that can (or might) be meaningfully
4187          * viewed?  In particular, this function may be used to determine if
4188          * links to the title should be rendered as "bluelinks" (as opposed to
4189          * "redlinks" to non-existent pages).
4190          * Adding something else to this function will cause inconsistency
4191          * since LinkHolderArray calls isAlwaysKnown() and does its own
4192          * page existence check.
4193          *
4194          * @return Bool
4195          */
4196         public function isKnown() {
4197                 return $this->isAlwaysKnown() || $this->exists();
4198         }
4199
4200         /**
4201          * Does this page have source text?
4202          *
4203          * @return Boolean
4204          */
4205         public function hasSourceText() {
4206                 if ( $this->exists() ) {
4207                         return true;
4208                 }
4209
4210                 if ( $this->mNamespace == NS_MEDIAWIKI ) {
4211                         // If the page doesn't exist but is a known system message, default
4212                         // message content will be displayed, same for language subpages-
4213                         // Use always content language to avoid loading hundreds of languages
4214                         // to get the link color.
4215                         global $wgContLang;
4216                         list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4217                         $message = wfMessage( $name )->inLanguage( $wgContLang )->useDatabase( false );
4218                         return $message->exists();
4219                 }
4220
4221                 return false;
4222         }
4223
4224         /**
4225          * Get the default message text or false if the message doesn't exist
4226          *
4227          * @return String or false
4228          */
4229         public function getDefaultMessageText() {
4230                 global $wgContLang;
4231
4232                 if ( $this->getNamespace() != NS_MEDIAWIKI ) { // Just in case
4233                         return false;
4234                 }
4235
4236                 list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4237                 $message = wfMessage( $name )->inLanguage( $lang )->useDatabase( false );
4238
4239                 if ( $message->exists() ) {
4240                         return $message->plain();
4241                 } else {
4242                         return false;
4243                 }
4244         }
4245
4246         /**
4247          * Updates page_touched for this page; called from LinksUpdate.php
4248          *
4249          * @return Bool true if the update succeded
4250          */
4251         public function invalidateCache() {
4252                 if ( wfReadOnly() ) {
4253                         return false;
4254                 }
4255                 $dbw = wfGetDB( DB_MASTER );
4256                 $success = $dbw->update(
4257                         'page',
4258                         array( 'page_touched' => $dbw->timestamp() ),
4259                         $this->pageCond(),
4260                         __METHOD__
4261                 );
4262                 HTMLFileCache::clearFileCache( $this );
4263                 return $success;
4264         }
4265
4266         /**
4267          * Update page_touched timestamps and send squid purge messages for
4268          * pages linking to this title. May be sent to the job queue depending
4269          * on the number of links. Typically called on create and delete.
4270          */
4271         public function touchLinks() {
4272                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
4273                 $u->doUpdate();
4274
4275                 if ( $this->getNamespace() == NS_CATEGORY ) {
4276                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
4277                         $u->doUpdate();
4278                 }
4279         }
4280
4281         /**
4282          * Get the last touched timestamp
4283          *
4284          * @param $db DatabaseBase: optional db
4285          * @return String last-touched timestamp
4286          */
4287         public function getTouched( $db = null ) {
4288                 $db = isset( $db ) ? $db : wfGetDB( DB_SLAVE );
4289                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
4290                 return $touched;
4291         }
4292
4293         /**
4294          * Get the timestamp when this page was updated since the user last saw it.
4295          *
4296          * @param $user User
4297          * @return String|Null
4298          */
4299         public function getNotificationTimestamp( $user = null ) {
4300                 global $wgUser, $wgShowUpdatedMarker;
4301                 // Assume current user if none given
4302                 if ( !$user ) {
4303                         $user = $wgUser;
4304                 }
4305                 // Check cache first
4306                 $uid = $user->getId();
4307                 // avoid isset here, as it'll return false for null entries
4308                 if ( array_key_exists( $uid, $this->mNotificationTimestamp ) ) {
4309                         return $this->mNotificationTimestamp[$uid];
4310                 }
4311                 if ( !$uid || !$wgShowUpdatedMarker ) {
4312                         return $this->mNotificationTimestamp[$uid] = false;
4313                 }
4314                 // Don't cache too much!
4315                 if ( count( $this->mNotificationTimestamp ) >= self::CACHE_MAX ) {
4316                         $this->mNotificationTimestamp = array();
4317                 }
4318                 $dbr = wfGetDB( DB_SLAVE );
4319                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
4320                         'wl_notificationtimestamp',
4321                         array(
4322                                 'wl_user' => $user->getId(),
4323                                 'wl_namespace' => $this->getNamespace(),
4324                                 'wl_title' => $this->getDBkey(),
4325                         ),
4326                         __METHOD__
4327                 );
4328                 return $this->mNotificationTimestamp[$uid];
4329         }
4330
4331         /**
4332          * Generate strings used for xml 'id' names in monobook tabs
4333          *
4334          * @param $prepend string defaults to 'nstab-'
4335          * @return String XML 'id' name
4336          */
4337         public function getNamespaceKey( $prepend = 'nstab-' ) {
4338                 global $wgContLang;
4339                 // Gets the subject namespace if this title
4340                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4341                 // Checks if cononical namespace name exists for namespace
4342                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4343                         // Uses canonical namespace name
4344                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4345                 } else {
4346                         // Uses text of namespace
4347                         $namespaceKey = $this->getSubjectNsText();
4348                 }
4349                 // Makes namespace key lowercase
4350                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4351                 // Uses main
4352                 if ( $namespaceKey == '' ) {
4353                         $namespaceKey = 'main';
4354                 }
4355                 // Changes file to image for backwards compatibility
4356                 if ( $namespaceKey == 'file' ) {
4357                         $namespaceKey = 'image';
4358                 }
4359                 return $prepend . $namespaceKey;
4360         }
4361
4362         /**
4363          * Get all extant redirects to this Title
4364          *
4365          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4366          * @return Array of Title redirects to this title
4367          */
4368         public function getRedirectsHere( $ns = null ) {
4369                 $redirs = array();
4370
4371                 $dbr = wfGetDB( DB_SLAVE );
4372                 $where = array(
4373                         'rd_namespace' => $this->getNamespace(),
4374                         'rd_title' => $this->getDBkey(),
4375                         'rd_from = page_id'
4376                 );
4377                 if ( !is_null( $ns ) ) {
4378                         $where['page_namespace'] = $ns;
4379                 }
4380
4381                 $res = $dbr->select(
4382                         array( 'redirect', 'page' ),
4383                         array( 'page_namespace', 'page_title' ),
4384                         $where,
4385                         __METHOD__
4386                 );
4387
4388                 foreach ( $res as $row ) {
4389                         $redirs[] = self::newFromRow( $row );
4390                 }
4391                 return $redirs;
4392         }
4393
4394         /**
4395          * Check if this Title is a valid redirect target
4396          *
4397          * @return Bool
4398          */
4399         public function isValidRedirectTarget() {
4400                 global $wgInvalidRedirectTargets;
4401
4402                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4403                 if ( $this->isSpecial( 'Userlogout' ) ) {
4404                         return false;
4405                 }
4406
4407                 foreach ( $wgInvalidRedirectTargets as $target ) {
4408                         if ( $this->isSpecial( $target ) ) {
4409                                 return false;
4410                         }
4411                 }
4412
4413                 return true;
4414         }
4415
4416         /**
4417          * Get a backlink cache object
4418          *
4419          * @return BacklinkCache
4420          */
4421         function getBacklinkCache() {
4422                 if ( is_null( $this->mBacklinkCache ) ) {
4423                         $this->mBacklinkCache = new BacklinkCache( $this );
4424                 }
4425                 return $this->mBacklinkCache;
4426         }
4427
4428         /**
4429          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4430          *
4431          * @return Boolean
4432          */
4433         public function canUseNoindex() {
4434                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4435
4436                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4437                         ? $wgContentNamespaces
4438                         : $wgExemptFromUserRobotsControl;
4439
4440                 return !in_array( $this->mNamespace, $bannedNamespaces );
4441
4442         }
4443
4444         /**
4445          * Returns the raw sort key to be used for categories, with the specified
4446          * prefix.  This will be fed to Collation::getSortKey() to get a
4447          * binary sortkey that can be used for actual sorting.
4448          *
4449          * @param $prefix string The prefix to be used, specified using
4450          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4451          *   prefix.
4452          * @return string
4453          */
4454         public function getCategorySortkey( $prefix = '' ) {
4455                 $unprefixed = $this->getText();
4456
4457                 // Anything that uses this hook should only depend
4458                 // on the Title object passed in, and should probably
4459                 // tell the users to run updateCollations.php --force
4460                 // in order to re-sort existing category relations.
4461                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4462                 if ( $prefix !== '' ) {
4463                         # Separate with a line feed, so the unprefixed part is only used as
4464                         # a tiebreaker when two pages have the exact same prefix.
4465                         # In UCA, tab is the only character that can sort above LF
4466                         # so we strip both of them from the original prefix.
4467                         $prefix = strtr( $prefix, "\n\t", '  ' );
4468                         return "$prefix\n$unprefixed";
4469                 }
4470                 return $unprefixed;
4471         }
4472
4473         /**
4474          * Get the language in which the content of this page is written.
4475          * Defaults to $wgContLang, but in certain cases it can be e.g.
4476          * $wgLang (such as special pages, which are in the user language).
4477          *
4478          * @since 1.18
4479          * @return Language
4480          */
4481         public function getPageLanguage() {
4482                 global $wgLang;
4483                 if ( $this->isSpecialPage() ) {
4484                         // special pages are in the user language
4485                         return $wgLang;
4486                 } elseif ( $this->isCssOrJsPage() || $this->isCssJsSubpage() ) {
4487                         // css/js should always be LTR and is, in fact, English
4488                         return wfGetLangObj( 'en' );
4489                 } elseif ( $this->getNamespace() == NS_MEDIAWIKI ) {
4490                         // Parse mediawiki messages with correct target language
4491                         list( /* $unused */, $lang ) = MessageCache::singleton()->figureMessage( $this->getText() );
4492                         return wfGetLangObj( $lang );
4493                 }
4494                 global $wgContLang;
4495                 // If nothing special, it should be in the wiki content language
4496                 $pageLang = $wgContLang;
4497                 // Hook at the end because we don't want to override the above stuff
4498                 wfRunHooks( 'PageContentLanguage', array( $this, &$pageLang, $wgLang ) );
4499                 return wfGetLangObj( $pageLang );
4500         }
4501 }