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         // @}
  87
  88
  89         /**
  90          * Constructor
  91          */
  92         /*protected*/ function __construct() { }
  93
  94         /**
  95          * Create a new Title from a prefixed DB key
  96          *
  97          * @param $key String the database key, which has underscores
  98          *      instead of spaces, possibly including namespace and
  99          *      interwiki prefixes
 100          * @return Title, or NULL on an error
 101          */
 102         public static function newFromDBkey( $key ) {
 103                 $t = new Title();
 104                 $t->mDbkeyform = $key;
 105                 if ( $t->secureAndSplit() ) {
 106                         return $t;
 107                 } else {
 108                         return null;
 109                 }
 110         }
 111
 112         /**
 113          * Create a new Title from text, such as what one would find in a link. De-
 114          * codes any HTML entities in the text.
 115          *
 116          * @param $text String the link text; spaces, prefixes, and an
 117          *   initial ':' indicating the main namespace are accepted.
 118          * @param $defaultNamespace Int the namespace to use if none is speci-
 119          *   fied by a prefix.  If you want to force a specific namespace even if
 120          *   $text might begin with a namespace prefix, use makeTitle() or
 121          *   makeTitleSafe().
 122          * @return Title, or null on an error.
 123          */
 124         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 125                 if ( is_object( $text ) ) {
 126                         throw new MWException( 'Title::newFromText given an object' );
 127                 }
 128
 129                 /**
 130                  * Wiki pages often contain multiple links to the same page.
 131                  * Title normalization and parsing can become expensive on
 132                  * pages with many links, so we can save a little time by
 133                  * caching them.
 134                  *
 135                  * In theory these are value objects and won't get changed...
 136                  */
 137                 if ( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 138                         return Title::$titleCache[$text];
 139                 }
 140
 141                 # Convert things like &eacute; &#257; or &#x3017; into normalized (bug 14952) text
 142                 $filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );
 143
 144                 $t = new Title();
 145                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 146                 $t->mDefaultNamespace = $defaultNamespace;
 147
 148                 static $cachedcount = 0 ;
 149                 if ( $t->secureAndSplit() ) {
 150                         if ( $defaultNamespace == NS_MAIN ) {
 151                                 if ( $cachedcount >= self::CACHE_MAX ) {
 152                                         # Avoid memory leaks on mass operations...
 153                                         Title::$titleCache = array();
 154                                         $cachedcount = 0;
 155                                 }
 156                                 $cachedcount++;
 157                                 Title::$titleCache[$text] =& $t;
 158                         }
 159                         return $t;
 160                 } else {
 161                         $ret = null;
 162                         return $ret;
 163                 }
 164         }
 165
 166         /**
 167          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 168          *
 169          * Example of wrong and broken code:
 170          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 171          *
 172          * Example of right code:
 173          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 174          *
 175          * Create a new Title from URL-encoded text. Ensures that
 176          * the given title's length does not exceed the maximum.
 177          *
 178          * @param $url String the title, as might be taken from a URL
 179          * @return Title the new object, or NULL on an error
 180          */
 181         public static function newFromURL( $url ) {
 182                 global $wgLegalTitleChars;
 183                 $t = new Title();
 184
 185                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 186                 # but some URLs used it as a space replacement and they still come
 187                 # from some external search tools.
 188                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 189                         $url = str_replace( '+', ' ', $url );
 190                 }
 191
 192                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 193                 if ( $t->secureAndSplit() ) {
 194                         return $t;
 195                 } else {
 196                         return null;
 197                 }
 198         }
 199
 200         /**
 201          * Create a new Title from an article ID
 202          *
 203          * @param $id Int the page_id corresponding to the Title to create
 204          * @param $flags Int use Title::GAID_FOR_UPDATE to use master
 205          * @return Title the new object, or NULL on an error
 206          */
 207         public static function newFromID( $id, $flags = 0 ) {
 208                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 209                 $row = $db->selectRow( 'page', '*', array( 'page_id' => $id ), __METHOD__ );
 210                 if ( $row !== false ) {
 211                         $title = Title::newFromRow( $row );
 212                 } else {
 213                         $title = null;
 214                 }
 215                 return $title;
 216         }
 217
 218         /**
 219          * Make an array of titles from an array of IDs
 220          *
 221          * @param $ids Array of Int Array of IDs
 222          * @return Array of Titles
 223          */
 224         public static function newFromIDs( $ids ) {
 225                 if ( !count( $ids ) ) {
 226                         return array();
 227                 }
 228                 $dbr = wfGetDB( DB_SLAVE );
 229
 230                 $res = $dbr->select(
 231                         'page',
 232                         array(
 233                                 'page_namespace', 'page_title', 'page_id',
 234                                 'page_len', 'page_is_redirect', 'page_latest',
 235                         ),
 236                         array( 'page_id' => $ids ),
 237                         __METHOD__
 238                 );
 239
 240                 $titles = array();
 241                 foreach ( $res as $row ) {
 242                         $titles[] = Title::newFromRow( $row );
 243                 }
 244                 return $titles;
 245         }
 246
 247         /**
 248          * Make a Title object from a DB row
 249          *
 250          * @param $row Object database row (needs at least page_title,page_namespace)
 251          * @return Title corresponding Title
 252          */
 253         public static function newFromRow( $row ) {
 254                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 255                 $t->loadFromRow( $row );
 256                 return $t;
 257         }
 258
 259         /**
 260          * Load Title object fields from a DB row.
 261          * If false is given, the title will be treated as non-existing.
 262          *
 263          * @param $row Object|bool database row
 264          */
 265         public function loadFromRow( $row ) {
 266                 if ( $row ) { // page found
 267                         if ( isset( $row->page_id ) )
 268                                 $this->mArticleID = (int)$row->page_id;
 269                         if ( isset( $row->page_len ) )
 270                                 $this->mLength = (int)$row->page_len;
 271                         if ( isset( $row->page_is_redirect ) )
 272                                 $this->mRedirect = (bool)$row->page_is_redirect;
 273                         if ( isset( $row->page_latest ) )
 274                                 $this->mLatestID = (int)$row->page_latest;
 275                 } else { // page not found
 276                         $this->mArticleID = 0;
 277                         $this->mLength = 0;
 278                         $this->mRedirect = false;
 279                         $this->mLatestID = 0;
 280                 }
 281         }
 282
 283         /**
 284          * Create a new Title from a namespace index and a DB key.
 285          * It's assumed that $ns and $title are *valid*, for instance when
 286          * they came directly from the database or a special page name.
 287          * For convenience, spaces are converted to underscores so that
 288          * eg user_text fields can be used directly.
 289          *
 290          * @param $ns Int the namespace of the article
 291          * @param $title String the unprefixed database key form
 292          * @param $fragment String the link fragment (after the "#")
 293          * @param $interwiki String the interwiki prefix
 294          * @return Title the new object
 295          */
 296         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 297                 $t = new Title();
 298                 $t->mInterwiki = $interwiki;
 299                 $t->mFragment = $fragment;
 300                 $t->mNamespace = $ns = intval( $ns );
 301                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 302                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 303                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 304                 $t->mTextform = str_replace( '_', ' ', $title );
 305                 return $t;
 306         }
 307
 308         /**
 309          * Create a new Title from a namespace index and a DB key.
 310          * The parameters will be checked for validity, which is a bit slower
 311          * than makeTitle() but safer for user-provided data.
 312          *
 313          * @param $ns Int the namespace of the article
 314          * @param $title String database key form
 315          * @param $fragment String the link fragment (after the "#")
 316          * @param $interwiki String interwiki prefix
 317          * @return Title the new object, or NULL on an error
 318          */
 319         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 320                 if ( !MWNamespace::exists( $ns ) ) {
 321                         return null;
 322                 }
 323
 324                 $t = new Title();
 325                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 326                 if ( $t->secureAndSplit() ) {
 327                         return $t;
 328                 } else {
 329                         return null;
 330                 }
 331         }
 332
 333         /**
 334          * Create a new Title for the Main Page
 335          *
 336          * @return Title the new object
 337          */
 338         public static function newMainPage() {
 339                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 340                 // Don't give fatal errors if the message is broken
 341                 if ( !$title ) {
 342                         $title = Title::newFromText( 'Main Page' );
 343                 }
 344                 return $title;
 345         }
 346
 347         /**
 348          * Extract a redirect destination from a string and return the
 349          * Title, or null if the text doesn't contain a valid redirect
 350          * This will only return the very next target, useful for
 351          * the redirect table and other checks that don't need full recursion
 352          *
 353          * @param $text String: Text with possible redirect
 354          * @return Title: The corresponding Title
 355          */
 356         public static function newFromRedirect( $text ) {
 357                 return self::newFromRedirectInternal( $text );
 358         }
 359
 360         /**
 361          * Extract a redirect destination from a string and return the
 362          * Title, or null if the text doesn't contain a valid redirect
 363          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 364          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 365          *
 366          * @param $text String Text with possible redirect
 367          * @return Title
 368          */
 369         public static function newFromRedirectRecurse( $text ) {
 370                 $titles = self::newFromRedirectArray( $text );
 371                 return $titles ? array_pop( $titles ) : null;
 372         }
 373
 374         /**
 375          * Extract a redirect destination from a string and return an
 376          * array of Titles, or null if the text doesn't contain a valid redirect
 377          * The last element in the array is the final destination after all redirects
 378          * have been resolved (up to $wgMaxRedirects times)
 379          *
 380          * @param $text String Text with possible redirect
 381          * @return Array of Titles, with the destination last
 382          */
 383         public static function newFromRedirectArray( $text ) {
 384                 global $wgMaxRedirects;
 385                 $title = self::newFromRedirectInternal( $text );
 386                 if ( is_null( $title ) ) {
 387                         return null;
 388                 }
 389                 // recursive check to follow double redirects
 390                 $recurse = $wgMaxRedirects;
 391                 $titles = array( $title );
 392                 while ( --$recurse > 0 ) {
 393                         if ( $title->isRedirect() ) {
 394                                 $page = WikiPage::factory( $title );
 395                                 $newtitle = $page->getRedirectTarget();
 396                         } else {
 397                                 break;
 398                         }
 399                         // Redirects to some special pages are not permitted
 400                         if ( $newtitle instanceOf Title && $newtitle->isValidRedirectTarget() ) {
 401                                 // the new title passes the checks, so make that our current title so that further recursion can be checked
 402                                 $title = $newtitle;
 403                                 $titles[] = $newtitle;
 404                         } else {
 405                                 break;
 406                         }
 407                 }
 408                 return $titles;
 409         }
 410
 411         /**
 412          * Really extract the redirect destination
 413          * Do not call this function directly, use one of the newFromRedirect* functions above
 414          *
 415          * @param $text String Text with possible redirect
 416          * @return Title
 417          */
 418         protected static function newFromRedirectInternal( $text ) {
 419                 global $wgMaxRedirects;
 420                 if ( $wgMaxRedirects < 1 ) {
 421                         //redirects are disabled, so quit early
 422                         return null;
 423                 }
 424                 $redir = MagicWord::get( 'redirect' );
 425                 $text = trim( $text );
 426                 if ( $redir->matchStartAndRemove( $text ) ) {
 427                         // Extract the first link and see if it's usable
 428                         // Ensure that it really does come directly after #REDIRECT
 429                         // Some older redirects included a colon, so don't freak about that!
 430                         $m = array();
 431                         if ( preg_match( '!^\s*:?\s*\[{2}(.*?)(?:\|.*?)?\]{2}!', $text, $m ) ) {
 432                                 // Strip preceding colon used to "escape" categories, etc.
 433                                 // and URL-decode links
 434                                 if ( strpos( $m[1], '%' ) !== false ) {
 435                                         // Match behavior of inline link parsing here;
 436                                         $m[1] = rawurldecode( ltrim( $m[1], ':' ) );
 437                                 }
 438                                 $title = Title::newFromText( $m[1] );
 439                                 // If the title is a redirect to bad special pages or is invalid, return null
 440                                 if ( !$title instanceof Title || !$title->isValidRedirectTarget() ) {
 441                                         return null;
 442                                 }
 443                                 return $title;
 444                         }
 445                 }
 446                 return null;
 447         }
 448
 449         /**
 450          * Get the prefixed DB key associated with an ID
 451          *
 452          * @param $id Int the page_id of the article
 453          * @return Title an object representing the article, or NULL if no such article was found
 454          */
 455         public static function nameOf( $id ) {
 456                 $dbr = wfGetDB( DB_SLAVE );
 457
 458                 $s = $dbr->selectRow(
 459                         'page',
 460                         array( 'page_namespace', 'page_title' ),
 461                         array( 'page_id' => $id ),
 462                         __METHOD__
 463                 );
 464                 if ( $s === false ) {
 465                         return null;
 466                 }
 467
 468                 $n = self::makeName( $s->page_namespace, $s->page_title );
 469                 return $n;
 470         }
 471
 472         /**
 473          * Get a regex character class describing the legal characters in a link
 474          *
 475          * @return String the list of characters, not delimited
 476          */
 477         public static function legalChars() {
 478                 global $wgLegalTitleChars;
 479                 return $wgLegalTitleChars;
 480         }
 481
 482         /**
 483          * Returns a simple regex that will match on characters and sequences invalid in titles.
 484          * Note that this doesn't pick up many things that could be wrong with titles, but that
 485          * replacing this regex with something valid will make many titles valid.
 486          *
 487          * @return String regex string
 488          */
 489         static function getTitleInvalidRegex() {
 490                 static $rxTc = false;
 491                 if ( !$rxTc ) {
 492                         # Matching titles will be held as illegal.
 493                         $rxTc = '/' .
 494                                 # Any character not allowed is forbidden...
 495                                 '[^' . self::legalChars() . ']' .
 496                                 # URL percent encoding sequences interfere with the ability
 497                                 # to round-trip titles -- you can't link to them consistently.
 498                                 '|%[0-9A-Fa-f]{2}' .
 499                                 # XML/HTML character references produce similar issues.
 500                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 501                                 '|&#[0-9]+;' .
 502                                 '|&#x[0-9A-Fa-f]+;' .
 503                                 '/S';
 504                 }
 505
 506                 return $rxTc;
 507         }
 508
 509         /**
 510          * Get a string representation of a title suitable for
 511          * including in a search index
 512          *
 513          * @param $ns Int a namespace index
 514          * @param $title String text-form main part
 515          * @return String a stripped-down title string ready for the search index
 516          */
 517         public static function indexTitle( $ns, $title ) {
 518                 global $wgContLang;
 519
 520                 $lc = SearchEngine::legalSearchChars() . '&#;';
 521                 $t = $wgContLang->normalizeForSearch( $title );
 522                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 523                 $t = $wgContLang->lc( $t );
 524
 525                 # Handle 's, s'
 526                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 527                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 528
 529                 $t = preg_replace( "/\\s+/", ' ', $t );
 530
 531                 if ( $ns == NS_FILE ) {
 532                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 533                 }
 534                 return trim( $t );
 535         }
 536
 537         /**
 538          * Make a prefixed DB key from a DB key and a namespace index
 539          *
 540          * @param $ns Int numerical representation of the namespace
 541          * @param $title String the DB key form the title
 542          * @param $fragment String The link fragment (after the "#")
 543          * @param $interwiki String The interwiki prefix
 544          * @return String the prefixed form of the title
 545          */
 546         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 547                 global $wgContLang;
 548
 549                 $namespace = $wgContLang->getNsText( $ns );
 550                 $name = $namespace == '' ? $title : "$namespace:$title";
 551                 if ( strval( $interwiki ) != '' ) {
 552                         $name = "$interwiki:$name";
 553                 }
 554                 if ( strval( $fragment ) != '' ) {
 555                         $name .= '#' . $fragment;
 556                 }
 557                 return $name;
 558         }
 559
 560         /**
 561          * Escape a text fragment, say from a link, for a URL
 562          *
 563          * @param $fragment string containing a URL or link fragment (after the "#")
 564          * @return String: escaped string
 565          */
 566         static function escapeFragmentForURL( $fragment ) {
 567                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 568                 # fragments appear not to work in IE (at least up to 7) or in at least
 569                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 570                 # to care if they aren't encoded.
 571                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 572         }
 573
 574         /**
 575          * Callback for usort() to do title sorts by (namespace, title)
 576          *
 577          * @param $a Title
 578          * @param $b Title
 579          *
 580          * @return Integer: result of string comparison, or namespace comparison
 581          */
 582         public static function compare( $a, $b ) {
 583                 if ( $a->getNamespace() == $b->getNamespace() ) {
 584                         return strcmp( $a->getText(), $b->getText() );
 585                 } else {
 586                         return $a->getNamespace() - $b->getNamespace();
 587                 }
 588         }
 589
 590         /**
 591          * Determine whether the object refers to a page within
 592          * this project.
 593          *
 594          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 595          */
 596         public function isLocal() {
 597                 if ( $this->mInterwiki != '' ) {
 598                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 599                 } else {
 600                         return true;
 601                 }
 602         }
 603
 604         /**
 605          * Is this Title interwiki?
 606          *
 607          * @return Bool
 608          */
 609         public function isExternal() {
 610                 return ( $this->mInterwiki != '' );
 611         }
 612
 613         /**
 614          * Get the interwiki prefix (or null string)
 615          *
 616          * @return String Interwiki prefix
 617          */
 618         public function getInterwiki() {
 619                 return $this->mInterwiki;
 620         }
 621
 622         /**
 623          * Determine whether the object refers to a page within
 624          * this project and is transcludable.
 625          *
 626          * @return Bool TRUE if this is transcludable
 627          */
 628         public function isTrans() {
 629                 if ( $this->mInterwiki == '' ) {
 630                         return false;
 631                 }
 632
 633                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 634         }
 635
 636         /**
 637          * Returns the DB name of the distant wiki which owns the object.
 638          *
 639          * @return String the DB name
 640          */
 641         public function getTransWikiID() {
 642                 if ( $this->mInterwiki == '' ) {
 643                         return false;
 644                 }
 645
 646                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 647         }
 648
 649         /**
 650          * Get the text form (spaces not underscores) of the main part
 651          *
 652          * @return String Main part of the title
 653          */
 654         public function getText() {
 655                 return $this->mTextform;
 656         }
 657
 658         /**
 659          * Get the URL-encoded form of the main part
 660          *
 661          * @return String Main part of the title, URL-encoded
 662          */
 663         public function getPartialURL() {
 664                 return $this->mUrlform;
 665         }
 666
 667         /**
 668          * Get the main part with underscores
 669          *
 670          * @return String: Main part of the title, with underscores
 671          */
 672         public function getDBkey() {
 673                 return $this->mDbkeyform;
 674         }
 675
 676         /**
 677          * Get the DB key with the initial letter case as specified by the user
 678          *
 679          * @return String DB key
 680          */
 681         function getUserCaseDBKey() {
 682                 return $this->mUserCaseDBKey;
 683         }
 684
 685         /**
 686          * Get the namespace index, i.e. one of the NS_xxxx constants.
 687          *
 688          * @return Integer: Namespace index
 689          */
 690         public function getNamespace() {
 691                 return $this->mNamespace;
 692         }
 693
 694         /**
 695          * Get the namespace text
 696          *
 697          * @return String: Namespace text
 698          */
 699         public function getNsText() {
 700                 global $wgContLang;
 701
 702                 if ( $this->mInterwiki != '' ) {
 703                         // This probably shouldn't even happen. ohh man, oh yuck.
 704                         // But for interwiki transclusion it sometimes does.
 705                         // Shit. Shit shit shit.
 706                         //
 707                         // Use the canonical namespaces if possible to try to
 708                         // resolve a foreign namespace.
 709                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 710                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 711                         }
 712                 }
 713
 714                 // Strip off subpages
 715                 $pagename = $this->getText();
 716                 if ( strpos( $pagename, '/' ) !== false ) {
 717                         list( $username , ) = explode( '/', $pagename, 2 );
 718                 } else {
 719                         $username = $pagename;
 720                 }
 721
 722                 if ( $wgContLang->needsGenderDistinction() &&
 723                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 724                         $gender = GenderCache::singleton()->getGenderOf( $username, __METHOD__ );
 725                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 726                 }
 727
 728                 return $wgContLang->getNsText( $this->mNamespace );
 729         }
 730
 731         /**
 732          * Get the namespace text of the subject (rather than talk) page
 733          *
 734          * @return String Namespace text
 735          */
 736         public function getSubjectNsText() {
 737                 global $wgContLang;
 738                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 739         }
 740
 741         /**
 742          * Get the namespace text of the talk page
 743          *
 744          * @return String Namespace text
 745          */
 746         public function getTalkNsText() {
 747                 global $wgContLang;
 748                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 749         }
 750
 751         /**
 752          * Could this title have a corresponding talk page?
 753          *
 754          * @return Bool TRUE or FALSE
 755          */
 756         public function canTalk() {
 757                 return( MWNamespace::canTalk( $this->mNamespace ) );
 758         }
 759
 760         /**
 761          * Is this in a namespace that allows actual pages?
 762          *
 763          * @return Bool
 764          * @internal note -- uses hardcoded namespace index instead of constants
 765          */
 766         public function canExist() {
 767                 return $this->mNamespace >= NS_MAIN;
 768         }
 769
 770         /**
 771          * Can this title be added to a user's watchlist?
 772          *
 773          * @return Bool TRUE or FALSE
 774          */
 775         public function isWatchable() {
 776                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 777         }
 778
 779         /**
 780          * Returns true if this is a special page.
 781          *
 782          * @return boolean
 783          */
 784         public function isSpecialPage() {
 785                 return $this->getNamespace() == NS_SPECIAL;
 786         }
 787
 788         /**
 789          * Returns true if this title resolves to the named special page
 790          *
 791          * @param $name String The special page name
 792          * @return boolean
 793          */
 794         public function isSpecial( $name ) {
 795                 if ( $this->isSpecialPage() ) {
 796                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 797                         if ( $name == $thisName ) {
 798                                 return true;
 799                         }
 800                 }
 801                 return false;
 802         }
 803
 804         /**
 805          * If the Title refers to a special page alias which is not the local default, resolve
 806          * the alias, and localise the name as necessary.  Otherwise, return $this
 807          *
 808          * @return Title
 809          */
 810         public function fixSpecialName() {
 811                 if ( $this->isSpecialPage() ) {
 812                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 813                         if ( $canonicalName ) {
 814                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 815                                 if ( $localName != $this->mDbkeyform ) {
 816                                         return Title::makeTitle( NS_SPECIAL, $localName );
 817                                 }
 818                         }
 819                 }
 820                 return $this;
 821         }
 822
 823         /**
 824          * Returns true if the title is inside the specified namespace.
 825          *
 826          * Please make use of this instead of comparing to getNamespace()
 827          * This function is much more resistant to changes we may make
 828          * to namespaces than code that makes direct comparisons.
 829          * @param $ns int The namespace
 830          * @return bool
 831          * @since 1.19
 832          */
 833         public function inNamespace( $ns ) {
 834                 return MWNamespace::equals( $this->getNamespace(), $ns );
 835         }
 836
 837         /**
 838          * Returns true if the title is inside one of the specified namespaces.
 839          *
 840          * @param ...$namespaces The namespaces to check for
 841          * @return bool
 842          * @since 1.19
 843          */
 844         public function inNamespaces( /* ... */ ) {
 845                 $namespaces = func_get_args();
 846                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 847                         $namespaces = $namespaces[0];
 848                 }
 849
 850                 foreach ( $namespaces as $ns ) {
 851                         if ( $this->inNamespace( $ns ) ) {
 852                                 return true;
 853                         }
 854                 }
 855
 856                 return false;
 857         }
 858
 859         /**
 860          * Returns true if the title has the same subject namespace as the
 861          * namespace specified.
 862          * For example this method will take NS_USER and return true if namespace
 863          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 864          * as their subject namespace.
 865          *
 866          * This is MUCH simpler than individually testing for equivilance
 867          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 868          * @since 1.19
 869          * @return bool
 870          */
 871         public function hasSubjectNamespace( $ns ) {
 872                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 873         }
 874
 875         /**
 876          * Is this Title in a namespace which contains content?
 877          * In other words, is this a content page, for the purposes of calculating
 878          * statistics, etc?
 879          *
 880          * @return Boolean
 881          */
 882         public function isContentPage() {
 883                 return MWNamespace::isContent( $this->getNamespace() );
 884         }
 885
 886         /**
 887          * Would anybody with sufficient privileges be able to move this page?
 888          * Some pages just aren't movable.
 889          *
 890          * @return Bool TRUE or FALSE
 891          */
 892         public function isMovable() {
 893                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 894                         // Interwiki title or immovable namespace. Hooks don't get to override here
 895                         return false;
 896                 }
 897
 898                 $result = true;
 899                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 900                 return $result;
 901         }
 902
 903         /**
 904          * Is this the mainpage?
 905          * @note Title::newFromText seams to be sufficiently optimized by the title
 906          * cache that we don't need to over-optimize by doing direct comparisons and
 907          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 908          * ends up reporting something differently than $title->isMainPage();
 909          *
 910          * @since 1.18
 911          * @return Bool
 912          */
 913         public function isMainPage() {
 914                 return $this->equals( Title::newMainPage() );
 915         }
 916
 917         /**
 918          * Is this a subpage?
 919          *
 920          * @return Bool
 921          */
 922         public function isSubpage() {
 923                 return MWNamespace::hasSubpages( $this->mNamespace )
 924                         ? strpos( $this->getText(), '/' ) !== false
 925                         : false;
 926         }
 927
 928         /**
 929          * Is this a conversion table for the LanguageConverter?
 930          *
 931          * @return Bool
 932          */
 933         public function isConversionTable() {
 934                 return $this->getNamespace() == NS_MEDIAWIKI &&
 935                         strpos( $this->getText(), 'Conversiontable' ) !== false;
 936         }
 937
 938         /**
 939          * Does that page contain wikitext, or it is JS, CSS or whatever?
 940          *
 941          * @return Bool
 942          */
 943         public function isWikitextPage() {
 944                 $retval = !$this->isCssOrJsPage() && !$this->isCssJsSubpage();
 945                 wfRunHooks( 'TitleIsWikitextPage', array( $this, &$retval ) );
 946                 return $retval;
 947         }
 948
 949         /**
 950          * Could this page contain custom CSS or JavaScript, based
 951          * on the title?
 952          *
 953          * @return Bool
 954          */
 955         public function isCssOrJsPage() {
 956                 $retval = $this->mNamespace == NS_MEDIAWIKI
 957                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
 958                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$retval ) );
 959                 return $retval;
 960         }
 961
 962         /**
 963          * Is this a .css or .js subpage of a user page?
 964          * @return Bool
 965          */
 966         public function isCssJsSubpage() {
 967                 return ( NS_USER == $this->mNamespace and preg_match( "/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
 968         }
 969
 970         /**
 971          * Trim down a .css or .js subpage title to get the corresponding skin name
 972          *
 973          * @return string containing skin name from .css or .js subpage title
 974          */
 975         public function getSkinFromCssJsSubpage() {
 976                 $subpage = explode( '/', $this->mTextform );
 977                 $subpage = $subpage[ count( $subpage ) - 1 ];
 978                 $lastdot = strrpos( $subpage, '.' );
 979                 if ( $lastdot === false )
 980                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
 981                 return substr( $subpage, 0, $lastdot );
 982         }
 983
 984         /**
 985          * Is this a .css subpage of a user page?
 986          *
 987          * @return Bool
 988          */
 989         public function isCssSubpage() {
 990                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.css$/", $this->mTextform ) );
 991         }
 992
 993         /**
 994          * Is this a .js subpage of a user page?
 995          *
 996          * @return Bool
 997          */
 998         public function isJsSubpage() {
 999                 return ( NS_USER == $this->mNamespace && preg_match( "/\\/.*\\.js$/", $this->mTextform ) );
1000         }
1001
1002         /**
1003          * Is this a talk page of some sort?
1004          *
1005          * @return Bool
1006          */
1007         public function isTalkPage() {
1008                 return MWNamespace::isTalk( $this->getNamespace() );
1009         }
1010
1011         /**
1012          * Get a Title object associated with the talk page of this article
1013          *
1014          * @return Title the object for the talk page
1015          */
1016         public function getTalkPage() {
1017                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1018         }
1019
1020         /**
1021          * Get a title object associated with the subject page of this
1022          * talk page
1023          *
1024          * @return Title the object for the subject page
1025          */
1026         public function getSubjectPage() {
1027                 // Is this the same title?
1028                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1029                 if ( $this->getNamespace() == $subjectNS ) {
1030                         return $this;
1031                 }
1032                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1033         }
1034
1035         /**
1036          * Get the default namespace index, for when there is no namespace
1037          *
1038          * @return Int Default namespace index
1039          */
1040         public function getDefaultNamespace() {
1041                 return $this->mDefaultNamespace;
1042         }
1043
1044         /**
1045          * Get title for search index
1046          *
1047          * @return String a stripped-down title string ready for the
1048          *  search index
1049          */
1050         public function getIndexTitle() {
1051                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1052         }
1053
1054         /**
1055          * Get the Title fragment (i.e.\ the bit after the #) in text form
1056          *
1057          * @return String Title fragment
1058          */
1059         public function getFragment() {
1060                 return $this->mFragment;
1061         }
1062
1063         /**
1064          * Get the fragment in URL form, including the "#" character if there is one
1065          * @return String Fragment in URL form
1066          */
1067         public function getFragmentForURL() {
1068                 if ( $this->mFragment == '' ) {
1069                         return '';
1070                 } else {
1071                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1072                 }
1073         }
1074
1075         /**
1076          * Set the fragment for this title. Removes the first character from the
1077          * specified fragment before setting, so it assumes you're passing it with
1078          * an initial "#".
1079          *
1080          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1081          * Still in active use privately.
1082          *
1083          * @param $fragment String text
1084          */
1085         public function setFragment( $fragment ) {
1086                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1087         }
1088
1089         /**
1090          * Prefix some arbitrary text with the namespace or interwiki prefix
1091          * of this object
1092          *
1093          * @param $name String the text
1094          * @return String the prefixed text
1095          * @private
1096          */
1097         private function prefix( $name ) {
1098                 $p = '';
1099                 if ( $this->mInterwiki != '' ) {
1100                         $p = $this->mInterwiki . ':';
1101                 }
1102
1103                 if ( 0 != $this->mNamespace ) {
1104                         $p .= $this->getNsText() . ':';
1105                 }
1106                 return $p . $name;
1107         }
1108
1109         /**
1110          * Get the prefixed database key form
1111          *
1112          * @return String the prefixed title, with underscores and
1113          *  any interwiki and namespace prefixes
1114          */
1115         public function getPrefixedDBkey() {
1116                 $s = $this->prefix( $this->mDbkeyform );
1117                 $s = str_replace( ' ', '_', $s );
1118                 return $s;
1119         }
1120
1121         /**
1122          * Get the prefixed title with spaces.
1123          * This is the form usually used for display
1124          *
1125          * @return String the prefixed title, with spaces
1126          */
1127         public function getPrefixedText() {
1128                 // @todo FIXME: Bad usage of empty() ?
1129                 if ( empty( $this->mPrefixedText ) ) {
1130                         $s = $this->prefix( $this->mTextform );
1131                         $s = str_replace( '_', ' ', $s );
1132                         $this->mPrefixedText = $s;
1133                 }
1134                 return $this->mPrefixedText;
1135         }
1136
1137         /**
1138          * Return a string representation of this title
1139          *
1140          * @return String representation of this title
1141          */
1142         public function __toString() {
1143                 return $this->getPrefixedText();
1144         }
1145
1146         /**
1147          * Get the prefixed title with spaces, plus any fragment
1148          * (part beginning with '#')
1149          *
1150          * @return String the prefixed title, with spaces and the fragment, including '#'
1151          */
1152         public function getFullText() {
1153                 $text = $this->getPrefixedText();
1154                 if ( $this->mFragment != '' ) {
1155                         $text .= '#' . $this->mFragment;
1156                 }
1157                 return $text;
1158         }
1159
1160         /**
1161          * Get the base page name, i.e. the leftmost part before any slashes
1162          *
1163          * @return String Base name
1164          */
1165         public function getBaseText() {
1166                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1167                         return $this->getText();
1168                 }
1169
1170                 $parts = explode( '/', $this->getText() );
1171                 # Don't discard the real title if there's no subpage involved
1172                 if ( count( $parts ) > 1 ) {
1173                         unset( $parts[count( $parts ) - 1] );
1174                 }
1175                 return implode( '/', $parts );
1176         }
1177
1178         /**
1179          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1180          *
1181          * @return String Subpage name
1182          */
1183         public function getSubpageText() {
1184                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1185                         return( $this->mTextform );
1186                 }
1187                 $parts = explode( '/', $this->mTextform );
1188                 return( $parts[count( $parts ) - 1] );
1189         }
1190
1191         /**
1192          * Get the HTML-escaped displayable text form.
1193          * Used for the title field in <a> tags.
1194          *
1195          * @return String the text, including any prefixes
1196          */
1197         public function getEscapedText() {
1198                 wfDeprecated( __METHOD__, '1.19' );
1199                 return htmlspecialchars( $this->getPrefixedText() );
1200         }
1201
1202         /**
1203          * Get a URL-encoded form of the subpage text
1204          *
1205          * @return String URL-encoded subpage name
1206          */
1207         public function getSubpageUrlForm() {
1208                 $text = $this->getSubpageText();
1209                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1210                 return( $text );
1211         }
1212
1213         /**
1214          * Get a URL-encoded title (not an actual URL) including interwiki
1215          *
1216          * @return String the URL-encoded form
1217          */
1218         public function getPrefixedURL() {
1219                 $s = $this->prefix( $this->mDbkeyform );
1220                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1221                 return $s;
1222         }
1223
1224         /**
1225          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1226          * get{Canonical,Full,Link,Local}URL methods accepted an optional
1227          * second argument named variant. This was deprecated in favor
1228          * of passing an array of option with a "variant" key
1229          * Once $query2 is removed for good, this helper can be dropped
1230          * andthe wfArrayToCGI moved to getLocalURL();
1231          *
1232          * @since 1.19 (r105919)
1233          * @return String
1234          */
1235         private static function fixUrlQueryArgs( $query, $query2 = false ) {
1236                 if( $query2 !== false ) {
1237                         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" );
1238                 }
1239                 if ( is_array( $query ) ) {
1240                         $query = wfArrayToCGI( $query );
1241                 }
1242                 if ( $query2 ) {
1243                         if ( is_string( $query2 ) ) {
1244                                 // $query2 is a string, we will consider this to be
1245                                 // a deprecated $variant argument and add it to the query
1246                                 $query2 = wfArrayToCGI( array( 'variant' => $query2 ) );
1247                         } else {
1248                                 $query2 = wfArrayToCGI( $query2 );
1249                         }
1250                         // If we have $query content add a & to it first
1251                         if ( $query ) {
1252                                 $query .= '&';
1253                         }
1254                         // Now append the queries together
1255                         $query .= $query2;
1256                 }
1257                 return $query;
1258         }
1259
1260         /**
1261          * Get a real URL referring to this title, with interwiki link and
1262          * fragment
1263          *
1264          * See getLocalURL for the arguments.
1265          *
1266          * @see self::getLocalURL
1267          * @return String the URL
1268          */
1269         public function getFullURL( $query = '', $query2 = false ) {
1270                 $query = self::fixUrlQueryArgs( $query, $query2 );
1271
1272                 # Hand off all the decisions on urls to getLocalURL
1273                 $url = $this->getLocalURL( $query );
1274
1275                 # Expand the url to make it a full url. Note that getLocalURL has the
1276                 # potential to output full urls for a variety of reasons, so we use
1277                 # wfExpandUrl instead of simply prepending $wgServer
1278                 $url = wfExpandUrl( $url, PROTO_RELATIVE );
1279
1280                 # Finally, add the fragment.
1281                 $url .= $this->getFragmentForURL();
1282
1283                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1284                 return $url;
1285         }
1286
1287         /**
1288          * Get a URL with no fragment or server name.  If this page is generated
1289          * with action=render, $wgServer is prepended.
1290          *
1291
1292          * @param $query string|array an optional query string,
1293          *   not used for interwiki     links. Can be specified as an associative array as well,
1294          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1295          *   Some query patterns will trigger various shorturl path replacements.
1296          * @param $query2 Mixed: An optional secondary query array. This one MUST
1297          *   be an array. If a string is passed it will be interpreted as a deprecated
1298          *   variant argument and urlencoded into a variant= argument.
1299          *   This second query argument will be added to the $query
1300          *   The second parameter is deprecated since 1.19. Pass it as a key,value
1301          *   pair in the first parameter array instead.
1302          *
1303          * @return String the URL
1304          */
1305         public function getLocalURL( $query = '', $query2 = false ) {
1306                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1307
1308                 $query = self::fixUrlQueryArgs( $query, $query2 );
1309
1310                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1311                 if ( $interwiki ) {
1312                         $namespace = $this->getNsText();
1313                         if ( $namespace != '' ) {
1314                                 # Can this actually happen? Interwikis shouldn't be parsed.
1315                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1316                                 $namespace .= ':';
1317                         }
1318                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1319                         $url = wfAppendQuery( $url, $query );
1320                 } else {
1321                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1322                         if ( $query == '' ) {
1323                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1324                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1325                         } else {
1326                                 global $wgVariantArticlePath, $wgActionPaths;
1327                                 $url = false;
1328                                 $matches = array();
1329
1330                                 if ( !empty( $wgActionPaths ) &&
1331                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1332                                 {
1333                                         $action = urldecode( $matches[2] );
1334                                         if ( isset( $wgActionPaths[$action] ) ) {
1335                                                 $query = $matches[1];
1336                                                 if ( isset( $matches[4] ) ) {
1337                                                         $query .= $matches[4];
1338                                                 }
1339                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1340                                                 if ( $query != '' ) {
1341                                                         $url = wfAppendQuery( $url, $query );
1342                                                 }
1343                                         }
1344                                 }
1345
1346                                 if ( $url === false &&
1347                                         $wgVariantArticlePath &&
1348                                         $this->getPageLanguage()->hasVariants() &&
1349                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1350                                 {
1351                                         $variant = urldecode( $matches[1] );
1352                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1353                                                 // Only do the variant replacement if the given variant is a valid
1354                                                 // variant for the page's language.
1355                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1356                                                 $url = str_replace( '$1', $dbkey, $url );
1357                                         }
1358                                 }
1359
1360                                 if ( $url === false ) {
1361                                         if ( $query == '-' ) {
1362                                                 $query = '';
1363                                         }
1364                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1365                                 }
1366                         }
1367
1368                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1369
1370                         // @todo FIXME: This causes breakage in various places when we
1371                         // actually expected a local URL and end up with dupe prefixes.
1372                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1373                                 $url = $wgServer . $url;
1374                         }
1375                 }
1376                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1377                 return $url;
1378         }
1379
1380         /**
1381          * Get a URL that's the simplest URL that will be valid to link, locally,
1382          * to the current Title.  It includes the fragment, but does not include
1383          * the server unless action=render is used (or the link is external).  If
1384          * there's a fragment but the prefixed text is empty, we just return a link
1385          * to the fragment.
1386          *
1387          * The result obviously should not be URL-escaped, but does need to be
1388          * HTML-escaped if it's being output in HTML.
1389          *
1390          * See getLocalURL for the arguments.
1391          *
1392          * @see self::getLocalURL
1393          * @return String the URL
1394          */
1395         public function getLinkURL( $query = '', $query2 = false ) {
1396                 wfProfileIn( __METHOD__ );
1397                 if ( $this->isExternal() ) {
1398                         $ret = $this->getFullURL( $query, $query2 );
1399                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1400                         $ret = $this->getFragmentForURL();
1401                 } else {
1402                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1403                 }
1404                 wfProfileOut( __METHOD__ );
1405                 return $ret;
1406         }
1407
1408         /**
1409          * Get an HTML-escaped version of the URL form, suitable for
1410          * using in a link, without a server name or fragment
1411          *
1412          * See getLocalURL for the arguments.
1413          *
1414          * @see self::getLocalURL
1415          * @return String the URL
1416          */
1417         public function escapeLocalURL( $query = '', $query2 = false ) {
1418                 wfDeprecated( __METHOD__, '1.19' );
1419                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1420         }
1421
1422         /**
1423          * Get an HTML-escaped version of the URL form, suitable for
1424          * using in a link, including the server name and fragment
1425          *
1426          * See getLocalURL for the arguments.
1427          *
1428          * @see self::getLocalURL
1429          * @return String the URL
1430          */
1431         public function escapeFullURL( $query = '', $query2 = false ) {
1432                 wfDeprecated( __METHOD__, '1.19' );
1433                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1434         }
1435
1436         /**
1437          * Get the URL form for an internal link.
1438          * - Used in various Squid-related code, in case we have a different
1439          * internal hostname for the server from the exposed one.
1440          *
1441          * This uses $wgInternalServer to qualify the path, or $wgServer
1442          * if $wgInternalServer is not set. If the server variable used is
1443          * protocol-relative, the URL will be expanded to http://
1444          *
1445          * See getLocalURL for the arguments.
1446          *
1447          * @see self::getLocalURL
1448          * @return String the URL
1449          */
1450         public function getInternalURL( $query = '', $query2 = false ) {
1451                 global $wgInternalServer, $wgServer;
1452                 $query = self::fixUrlQueryArgs( $query, $query2 );
1453                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1454                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1455                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1456                 return $url;
1457         }
1458
1459         /**
1460          * Get the URL for a canonical link, for use in things like IRC and
1461          * e-mail notifications. Uses $wgCanonicalServer and the
1462          * GetCanonicalURL hook.
1463          *
1464          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1465          *
1466          * See getLocalURL for the arguments.
1467          *
1468          * @see self::getLocalURL
1469          * @return string The URL
1470          * @since 1.18
1471          */
1472         public function getCanonicalURL( $query = '', $query2 = false ) {
1473                 $query = self::fixUrlQueryArgs( $query, $query2 );
1474                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1475                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1476                 return $url;
1477         }
1478
1479         /**
1480          * HTML-escaped version of getCanonicalURL()
1481          *
1482          * See getLocalURL for the arguments.
1483          *
1484          * @see self::getLocalURL
1485          * @since 1.18
1486          * @return string
1487          */
1488         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1489                 wfDeprecated( __METHOD__, '1.19' );
1490                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1491         }
1492
1493         /**
1494          * Get the edit URL for this Title
1495          *
1496          * @return String the URL, or a null string if this is an
1497          *  interwiki link
1498          */
1499         public function getEditURL() {
1500                 if ( $this->mInterwiki != '' ) {
1501                         return '';
1502                 }
1503                 $s = $this->getLocalURL( 'action=edit' );
1504
1505                 return $s;
1506         }
1507
1508         /**
1509          * Is $wgUser watching this page?
1510          *
1511          * @return Bool
1512          */
1513         public function userIsWatching() {
1514                 global $wgUser;
1515
1516                 if ( is_null( $this->mWatched ) ) {
1517                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1518                                 $this->mWatched = false;
1519                         } else {
1520                                 $this->mWatched = $wgUser->isWatched( $this );
1521                         }
1522                 }
1523                 return $this->mWatched;
1524         }
1525
1526         /**
1527          * Can $wgUser read this page?
1528          *
1529          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1530          * @return Bool
1531          * @todo fold these checks into userCan()
1532          */
1533         public function userCanRead() {
1534                 wfDeprecated( __METHOD__, '1.19' );
1535                 return $this->userCan( 'read' );
1536         }
1537
1538         /**
1539          * Can $user perform $action on this page?
1540          * This skips potentially expensive cascading permission checks
1541          * as well as avoids expensive error formatting
1542          *
1543          * Suitable for use for nonessential UI controls in common cases, but
1544          * _not_ for functional access control.
1545          *
1546          * May provide false positives, but should never provide a false negative.
1547          *
1548          * @param $action String action that permission needs to be checked for
1549          * @param $user User to check (since 1.19); $wgUser will be used if not
1550          *              provided.
1551          * @return Bool
1552          */
1553         public function quickUserCan( $action, $user = null ) {
1554                 return $this->userCan( $action, $user, false );
1555         }
1556
1557         /**
1558          * Can $user perform $action on this page?
1559          *
1560          * @param $action String action that permission needs to be checked for
1561          * @param $user User to check (since 1.19); $wgUser will be used if not
1562          *   provided.
1563          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1564          *   unnecessary queries.
1565          * @return Bool
1566          */
1567         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1568                 if ( !$user instanceof User ) {
1569                         global $wgUser;
1570                         $user = $wgUser;
1571                 }
1572                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1573         }
1574
1575         /**
1576          * Can $user perform $action on this page?
1577          *
1578          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1579          *
1580          * @param $action String action that permission needs to be checked for
1581          * @param $user User to check
1582          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1583          *   queries by skipping checks for cascading protections and user blocks.
1584          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1585          *   whose corresponding errors may be ignored.
1586          * @return Array of arguments to wfMsg to explain permissions problems.
1587          */
1588         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1589                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1590
1591                 // Remove the errors being ignored.
1592                 foreach ( $errors as $index => $error ) {
1593                         $error_key = is_array( $error ) ? $error[0] : $error;
1594
1595                         if ( in_array( $error_key, $ignoreErrors ) ) {
1596                                 unset( $errors[$index] );
1597                         }
1598                 }
1599
1600                 return $errors;
1601         }
1602
1603         /**
1604          * Permissions checks that fail most often, and which are easiest to test.
1605          *
1606          * @param $action String the action to check
1607          * @param $user User user to check
1608          * @param $errors Array list of current errors
1609          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1610          * @param $short Boolean short circuit on first error
1611          *
1612          * @return Array list of errors
1613          */
1614         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1615                 if ( $action == 'create' ) {
1616                         if ( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1617                                  ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1618                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1619                         }
1620                 } elseif ( $action == 'move' ) {
1621                         if ( !$user->isAllowed( 'move-rootuserpages' )
1622                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1623                                 // Show user page-specific message only if the user can move other pages
1624                                 $errors[] = array( 'cant-move-user-page' );
1625                         }
1626
1627                         // Check if user is allowed to move files if it's a file
1628                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1629                                 $errors[] = array( 'movenotallowedfile' );
1630                         }
1631
1632                         if ( !$user->isAllowed( 'move' ) ) {
1633                                 // User can't move anything
1634                                 global $wgGroupPermissions;
1635                                 $userCanMove = false;
1636                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1637                                         $userCanMove = $wgGroupPermissions['user']['move'];
1638                                 }
1639                                 $autoconfirmedCanMove = false;
1640                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1641                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1642                                 }
1643                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1644                                         // custom message if logged-in users without any special rights can move
1645                                         $errors[] = array( 'movenologintext' );
1646                                 } else {
1647                                         $errors[] = array( 'movenotallowed' );
1648                                 }
1649                         }
1650                 } elseif ( $action == 'move-target' ) {
1651                         if ( !$user->isAllowed( 'move' ) ) {
1652                                 // User can't move anything
1653                                 $errors[] = array( 'movenotallowed' );
1654                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1655                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1656                                 // Show user page-specific message only if the user can move other pages
1657                                 $errors[] = array( 'cant-move-to-user-page' );
1658                         }
1659                 } elseif ( !$user->isAllowed( $action ) ) {
1660                         $errors[] = $this->missingPermissionError( $action, $short );
1661                 }
1662
1663                 return $errors;
1664         }
1665
1666         /**
1667          * Add the resulting error code to the errors array
1668          *
1669          * @param $errors Array list of current errors
1670          * @param $result Mixed result of errors
1671          *
1672          * @return Array list of errors
1673          */
1674         private function resultToError( $errors, $result ) {
1675                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1676                         // A single array representing an error
1677                         $errors[] = $result;
1678                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1679                         // A nested array representing multiple errors
1680                         $errors = array_merge( $errors, $result );
1681                 } elseif ( $result !== '' && is_string( $result ) ) {
1682                         // A string representing a message-id
1683                         $errors[] = array( $result );
1684                 } elseif ( $result === false ) {
1685                         // a generic "We don't want them to do that"
1686                         $errors[] = array( 'badaccess-group0' );
1687                 }
1688                 return $errors;
1689         }
1690
1691         /**
1692          * Check various permission hooks
1693          *
1694          * @param $action String the action to check
1695          * @param $user User user to check
1696          * @param $errors Array list of current errors
1697          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1698          * @param $short Boolean short circuit on first error
1699          *
1700          * @return Array list of errors
1701          */
1702         private function checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1703                 // Use getUserPermissionsErrors instead
1704                 $result = '';
1705                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1706                         return $result ? array() : array( array( 'badaccess-group0' ) );
1707                 }
1708                 // Check getUserPermissionsErrors hook
1709                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1710                         $errors = $this->resultToError( $errors, $result );
1711                 }
1712                 // Check getUserPermissionsErrorsExpensive hook
1713                 if ( $doExpensiveQueries && !( $short && count( $errors ) > 0 ) &&
1714                          !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1715                         $errors = $this->resultToError( $errors, $result );
1716                 }
1717
1718                 return $errors;
1719         }
1720
1721         /**
1722          * Check permissions on special pages & namespaces
1723          *
1724          * @param $action String the action to check
1725          * @param $user User user to check
1726          * @param $errors Array list of current errors
1727          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1728          * @param $short Boolean short circuit on first error
1729          *
1730          * @return Array list of errors
1731          */
1732         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1733                 # Only 'createaccount' and 'execute' can be performed on
1734                 # special pages, which don't actually exist in the DB.
1735                 $specialOKActions = array( 'createaccount', 'execute', 'read' );
1736                 if ( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions ) ) {
1737                         $errors[] = array( 'ns-specialprotected' );
1738                 }
1739
1740                 # Check $wgNamespaceProtection for restricted namespaces
1741                 if ( $this->isNamespaceProtected( $user ) ) {
1742                         $ns = $this->mNamespace == NS_MAIN ?
1743                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1744                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1745                                 array( 'protectedinterface' ) : array( 'namespaceprotected',  $ns );
1746                 }
1747
1748                 return $errors;
1749         }
1750
1751         /**
1752          * Check CSS/JS sub-page permissions
1753          *
1754          * @param $action String the action to check
1755          * @param $user User user to check
1756          * @param $errors Array list of current errors
1757          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1758          * @param $short Boolean short circuit on first error
1759          *
1760          * @return Array list of errors
1761          */
1762         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1763                 # Protect css/js subpages of user pages
1764                 # XXX: this might be better using restrictions
1765                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1766                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1767                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1768                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1769                                 $errors[] = array( 'customcssprotected' );
1770                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1771                                 $errors[] = array( 'customjsprotected' );
1772                         }
1773                 }
1774
1775                 return $errors;
1776         }
1777
1778         /**
1779          * Check against page_restrictions table requirements on this
1780          * page. The user must possess all required rights for this
1781          * action.
1782          *
1783          * @param $action String the action to check
1784          * @param $user User user to check
1785          * @param $errors Array list of current errors
1786          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1787          * @param $short Boolean short circuit on first error
1788          *
1789          * @return Array list of errors
1790          */
1791         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1792                 foreach ( $this->getRestrictions( $action ) as $right ) {
1793                         // Backwards compatibility, rewrite sysop -> protect
1794                         if ( $right == 'sysop' ) {
1795                                 $right = 'protect';
1796                         }
1797                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1798                                 // Users with 'editprotected' permission can edit protected pages
1799                                 // without cascading option turned on.
1800                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1801                                         || $this->mCascadeRestriction )
1802                                 {
1803                                         $errors[] = array( 'protectedpagetext', $right );
1804                                 }
1805                         }
1806                 }
1807
1808                 return $errors;
1809         }
1810
1811         /**
1812          * Check restrictions on cascading pages.
1813          *
1814          * @param $action String the action to check
1815          * @param $user User to check
1816          * @param $errors Array list of current errors
1817          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1818          * @param $short Boolean short circuit on first error
1819          *
1820          * @return Array list of errors
1821          */
1822         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1823                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1824                         # We /could/ use the protection level on the source page, but it's
1825                         # fairly ugly as we have to establish a precedence hierarchy for pages
1826                         # included by multiple cascade-protected pages. So just restrict
1827                         # it to people with 'protect' permission, as they could remove the
1828                         # protection anyway.
1829                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1830                         # Cascading protection depends on more than this page...
1831                         # Several cascading protected pages may include this page...
1832                         # Check each cascading level
1833                         # This is only for protection restrictions, not for all actions
1834                         if ( isset( $restrictions[$action] ) ) {
1835                                 foreach ( $restrictions[$action] as $right ) {
1836                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1837                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1838                                                 $pages = '';
1839                                                 foreach ( $cascadingSources as $page )
1840                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1841                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1842                                         }
1843                                 }
1844                         }
1845                 }
1846
1847                 return $errors;
1848         }
1849
1850         /**
1851          * Check action permissions not already checked in checkQuickPermissions
1852          *
1853          * @param $action String the action to check
1854          * @param $user User to check
1855          * @param $errors Array list of current errors
1856          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1857          * @param $short Boolean short circuit on first error
1858          *
1859          * @return Array list of errors
1860          */
1861         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1862                 global $wgDeleteRevisionsLimit, $wgLang;
1863
1864                 if ( $action == 'protect' ) {
1865                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1866                                 // If they can't edit, they shouldn't protect.
1867                                 $errors[] = array( 'protect-cantedit' );
1868                         }
1869                 } elseif ( $action == 'create' ) {
1870                         $title_protection = $this->getTitleProtection();
1871                         if( $title_protection ) {
1872                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1873                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1874                                 }
1875                                 if( $title_protection['pt_create_perm'] == '' ||
1876                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1877                                 {
1878                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1879                                 }
1880                         }
1881                 } elseif ( $action == 'move' ) {
1882                         // Check for immobile pages
1883                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1884                                 // Specific message for this case
1885                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1886                         } elseif ( !$this->isMovable() ) {
1887                                 // Less specific message for rarer cases
1888                                 $errors[] = array( 'immobile-source-page' );
1889                         }
1890                 } elseif ( $action == 'move-target' ) {
1891                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1892                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1893                         } elseif ( !$this->isMovable() ) {
1894                                 $errors[] = array( 'immobile-target-page' );
1895                         }
1896                 } elseif ( $action == 'delete' ) {
1897                         if ( $doExpensiveQueries && $wgDeleteRevisionsLimit
1898                                 && !$this->userCan( 'bigdelete', $user ) && $this->isBigDeletion() )
1899                         {
1900                                 $errors[] = array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) );
1901                         }
1902                 }
1903                 return $errors;
1904         }
1905
1906         /**
1907          * Check that the user isn't blocked from editting.
1908          *
1909          * @param $action String the action to check
1910          * @param $user User to check
1911          * @param $errors Array list of current errors
1912          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1913          * @param $short Boolean short circuit on first error
1914          *
1915          * @return Array list of errors
1916          */
1917         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
1918                 // Account creation blocks handled at userlogin.
1919                 // Unblocking handled in SpecialUnblock
1920                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
1921                         return $errors;
1922                 }
1923
1924                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
1925
1926                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1927                         $errors[] = array( 'confirmedittext' );
1928                 }
1929
1930                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
1931                         // Don't block the user from editing their own talk page unless they've been
1932                         // explicitly blocked from that too.
1933                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
1934                         $block = $user->getBlock();
1935
1936                         // This is from OutputPage::blockedPage
1937                         // Copied at r23888 by werdna
1938
1939                         $id = $user->blockedBy();
1940                         $reason = $user->blockedFor();
1941                         if ( $reason == '' ) {
1942                                 $reason = wfMsg( 'blockednoreason' );
1943                         }
1944                         $ip = $user->getRequest()->getIP();
1945
1946                         if ( is_numeric( $id ) ) {
1947                                 $name = User::whoIs( $id );
1948                         } else {
1949                                 $name = $id;
1950                         }
1951
1952                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1953                         $blockid = $block->getId();
1954                         $blockExpiry = $block->getExpiry();
1955                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $block->mTimestamp ), true );
1956                         if ( $blockExpiry == 'infinity' ) {
1957                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
1958                         } else {
1959                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1960                         }
1961
1962                         $intended = strval( $block->getTarget() );
1963
1964                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
1965                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1966                 }
1967
1968                 return $errors;
1969         }
1970
1971         /**
1972          * Check that the user is allowed to read this page.
1973          *
1974          * @param $action String the action to check
1975          * @param $user User to check
1976          * @param $errors Array list of current errors
1977          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1978          * @param $short Boolean short circuit on first error
1979          *
1980          * @return Array list of errors
1981          */
1982         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1983                 global $wgWhitelistRead, $wgGroupPermissions, $wgRevokePermissions;
1984                 static $useShortcut = null;
1985
1986                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1987                 if ( is_null( $useShortcut ) ) {
1988                         $useShortcut = true;
1989                         if ( empty( $wgGroupPermissions['*']['read'] ) ) {
1990                                 # Not a public wiki, so no shortcut
1991                                 $useShortcut = false;
1992                         } elseif ( !empty( $wgRevokePermissions ) ) {
1993                                 /**
1994                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1995                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1996                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1997                                  * reading is allowed.
1998                                  */
1999                                 foreach ( $wgRevokePermissions as $perms ) {
2000                                         if ( !empty( $perms['read'] ) ) {
2001                                                 # We might be removing the read right from the user, so no shortcut
2002                                                 $useShortcut = false;
2003                                                 break;
2004                                         }
2005                                 }
2006                         }
2007                 }
2008
2009                 $whitelisted = false;
2010                 if ( $useShortcut ) {
2011                         # Shortcut for public wikis, allows skipping quite a bit of code
2012                         $whitelisted = true;
2013                 } elseif ( $user->isAllowed( 'read' ) ) {
2014                         # If the user is allowed to read pages, he is allowed to read all pages
2015                         $whitelisted = true;
2016                 } elseif ( $this->isSpecial( 'Userlogin' )
2017                         || $this->isSpecial( 'ChangePassword' )
2018                         || $this->isSpecial( 'PasswordReset' )
2019                 ) {
2020                         # Always grant access to the login page.
2021                         # Even anons need to be able to log in.
2022                         $whitelisted = true;
2023                 } elseif ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2024                         # Time to check the whitelist
2025                         # Only do these checks is there's something to check against
2026                         $name = $this->getPrefixedText();
2027                         $dbName = $this->getPrefixedDBKey();
2028
2029                         // Check for explicit whitelisting with and without underscores
2030                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2031                                 $whitelisted = true;
2032                         } elseif ( $this->getNamespace() == NS_MAIN ) {
2033                                 # Old settings might have the title prefixed with
2034                                 # a colon for main-namespace pages
2035                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2036                                         $whitelisted = true;
2037                                 }
2038                         } elseif ( $this->isSpecialPage() ) {
2039                                 # If it's a special page, ditch the subpage bit and check again
2040                                 $name = $this->getDBkey();
2041                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2042                                 if ( $name !== false ) {
2043                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2044                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2045                                                 $whitelisted = true;
2046                                         }
2047                                 }
2048                         }
2049                 }
2050
2051                 if ( !$whitelisted ) {
2052                         # If the title is not whitelisted, give extensions a chance to do so...
2053                         wfRunHooks( 'TitleReadWhitelist', array( $this, $user, &$whitelisted ) );
2054                         if ( !$whitelisted ) {
2055                                 $errors[] = $this->missingPermissionError( $action, $short );
2056                         }
2057                 }
2058
2059                 return $errors;
2060         }
2061
2062         /**
2063          * Get a description array when the user doesn't have the right to perform
2064          * $action (i.e. when User::isAllowed() returns false)
2065          *
2066          * @param $action String the action to check
2067          * @param $short Boolean short circuit on first error
2068          * @return Array list of errors
2069          */
2070         private function missingPermissionError( $action, $short ) {
2071                 // We avoid expensive display logic for quickUserCan's and such
2072                 if ( $short ) {
2073                         return array( 'badaccess-group0' );
2074                 }
2075
2076                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2077                         User::getGroupsWithPermission( $action ) );
2078
2079                 if ( count( $groups ) ) {
2080                         global $wgLang;
2081                         return array(
2082                                 'badaccess-groups',
2083                                 $wgLang->commaList( $groups ),
2084                                 count( $groups )
2085                         );
2086                 } else {
2087                         return array( 'badaccess-group0' );
2088                 }
2089         }
2090
2091         /**
2092          * Can $user perform $action on this page? This is an internal function,
2093          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2094          * checks on wfReadOnly() and blocks)
2095          *
2096          * @param $action String action that permission needs to be checked for
2097          * @param $user User to check
2098          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2099          * @param $short Bool Set this to true to stop after the first permission error.
2100          * @return Array of arrays of the arguments to wfMsg to explain permissions problems.
2101          */
2102         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2103                 wfProfileIn( __METHOD__ );
2104
2105                 # Read has special handling
2106                 if ( $action == 'read' ) {
2107                         $checks = array(
2108                                 'checkPermissionHooks',
2109                                 'checkReadPermissions',
2110                         );
2111                 } else {
2112                         $checks = array(
2113                                 'checkQuickPermissions',
2114                                 'checkPermissionHooks',
2115                                 'checkSpecialsAndNSPermissions',
2116                                 'checkCSSandJSPermissions',
2117                                 'checkPageRestrictions',
2118                                 'checkCascadingSourcesRestrictions',
2119                                 'checkActionPermissions',
2120                                 'checkUserBlock'
2121                         );
2122                 }
2123
2124                 $errors = array();
2125                 while( count( $checks ) > 0 &&
2126                                 !( $short && count( $errors ) > 0 ) ) {
2127                         $method = array_shift( $checks );
2128                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2129                 }
2130
2131                 wfProfileOut( __METHOD__ );
2132                 return $errors;
2133         }
2134
2135         /**
2136          * Protect css subpages of user pages: can $wgUser edit
2137          * this page?
2138          *
2139          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2140          * @return Bool
2141          */
2142         public function userCanEditCssSubpage() {
2143                 global $wgUser;
2144                 wfDeprecated( __METHOD__, '1.19' );
2145                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2146                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2147         }
2148
2149         /**
2150          * Protect js subpages of user pages: can $wgUser edit
2151          * this page?
2152          *
2153          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2154          * @return Bool
2155          */
2156         public function userCanEditJsSubpage() {
2157                 global $wgUser;
2158                 wfDeprecated( __METHOD__, '1.19' );
2159                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2160                            || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2161         }
2162
2163         /**
2164          * Get a filtered list of all restriction types supported by this wiki.
2165          * @param bool $exists True to get all restriction types that apply to
2166          * titles that do exist, False for all restriction types that apply to
2167          * titles that do not exist
2168          * @return array
2169          */
2170         public static function getFilteredRestrictionTypes( $exists = true ) {
2171                 global $wgRestrictionTypes;
2172                 $types = $wgRestrictionTypes;
2173                 if ( $exists ) {
2174                         # Remove the create restriction for existing titles
2175                         $types = array_diff( $types, array( 'create' ) );
2176                 } else {
2177                         # Only the create and upload restrictions apply to non-existing titles
2178                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2179                 }
2180                 return $types;
2181         }
2182
2183         /**
2184          * Returns restriction types for the current Title
2185          *
2186          * @return array applicable restriction types
2187          */
2188         public function getRestrictionTypes() {
2189                 if ( $this->isSpecialPage() ) {
2190                         return array();
2191                 }
2192
2193                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2194
2195                 if ( $this->getNamespace() != NS_FILE ) {
2196                         # Remove the upload restriction for non-file titles
2197                         $types = array_diff( $types, array( 'upload' ) );
2198                 }
2199
2200                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2201
2202                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2203                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2204
2205                 return $types;
2206         }
2207
2208         /**
2209          * Is this title subject to title protection?
2210          * Title protection is the one applied against creation of such title.
2211          *
2212          * @return Mixed An associative array representing any existent title
2213          *   protection, or false if there's none.
2214          */
2215         private function getTitleProtection() {
2216                 // Can't protect pages in special namespaces
2217                 if ( $this->getNamespace() < 0 ) {
2218                         return false;
2219                 }
2220
2221                 // Can't protect pages that exist.
2222                 if ( $this->exists() ) {
2223                         return false;
2224                 }
2225
2226                 if ( !isset( $this->mTitleProtection ) ) {
2227                         $dbr = wfGetDB( DB_SLAVE );
2228                         $res = $dbr->select( 'protected_titles', '*',
2229                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2230                                 __METHOD__ );
2231
2232                         // fetchRow returns false if there are no rows.
2233                         $this->mTitleProtection = $dbr->fetchRow( $res );
2234                 }
2235                 return $this->mTitleProtection;
2236         }
2237
2238         /**
2239          * Update the title protection status
2240          *
2241          * @deprecated in 1.19; will be removed in 1.20. Use WikiPage::doUpdateRestrictions() instead.
2242          * @param $create_perm String Permission required for creation
2243          * @param $reason String Reason for protection
2244          * @param $expiry String Expiry timestamp
2245          * @return boolean true
2246          */
2247         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2248                 wfDeprecated( __METHOD__, '1.19' );
2249
2250                 global $wgUser;
2251
2252                 $limit = array( 'create' => $create_perm );
2253                 $expiry = array( 'create' => $expiry );
2254
2255                 $page = WikiPage::factory( $this );
2256                 $status = $page->doUpdateRestrictions( $limit, $expiry, false, $reason, $wgUser );
2257
2258                 return $status->isOK();
2259         }
2260
2261         /**
2262          * Remove any title protection due to page existing
2263          */
2264         public function deleteTitleProtection() {
2265                 $dbw = wfGetDB( DB_MASTER );
2266
2267                 $dbw->delete(
2268                         'protected_titles',
2269                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2270                         __METHOD__
2271                 );
2272                 $this->mTitleProtection = false;
2273         }
2274
2275         /**
2276          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2277          *
2278          * @param $action String Action to check (default: edit)
2279          * @return Bool
2280          */
2281         public function isSemiProtected( $action = 'edit' ) {
2282                 if ( $this->exists() ) {
2283                         $restrictions = $this->getRestrictions( $action );
2284                         if ( count( $restrictions ) > 0 ) {
2285                                 foreach ( $restrictions as $restriction ) {
2286                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2287                                                 return false;
2288                                         }
2289                                 }
2290                         } else {
2291                                 # Not protected
2292                                 return false;
2293                         }
2294                         return true;
2295                 } else {
2296                         # If it doesn't exist, it can't be protected
2297                         return false;
2298                 }
2299         }
2300
2301         /**
2302          * Does the title correspond to a protected article?
2303          *
2304          * @param $action String the action the page is protected from,
2305          * by default checks all actions.
2306          * @return Bool
2307          */
2308         public function isProtected( $action = '' ) {
2309                 global $wgRestrictionLevels;
2310
2311                 $restrictionTypes = $this->getRestrictionTypes();
2312
2313                 # Special pages have inherent protection
2314                 if( $this->isSpecialPage() ) {
2315                         return true;
2316                 }
2317
2318                 # Check regular protection levels
2319                 foreach ( $restrictionTypes as $type ) {
2320                         if ( $action == $type || $action == '' ) {
2321                                 $r = $this->getRestrictions( $type );
2322                                 foreach ( $wgRestrictionLevels as $level ) {
2323                                         if ( in_array( $level, $r ) && $level != '' ) {
2324                                                 return true;
2325                                         }
2326                                 }
2327                         }
2328                 }
2329
2330                 return false;
2331         }
2332
2333         /**
2334          * Determines if $user is unable to edit this page because it has been protected
2335          * by $wgNamespaceProtection.
2336          *
2337          * @param $user User object to check permissions
2338          * @return Bool
2339          */
2340         public function isNamespaceProtected( User $user ) {
2341                 global $wgNamespaceProtection;
2342
2343                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2344                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2345                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2346                                         return true;
2347                                 }
2348                         }
2349                 }
2350                 return false;
2351         }
2352
2353         /**
2354          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2355          *
2356          * @return Bool If the page is subject to cascading restrictions.
2357          */
2358         public function isCascadeProtected() {
2359                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2360                 return ( $sources > 0 );
2361         }
2362
2363         /**
2364          * Cascading protection: Get the source of any cascading restrictions on this page.
2365          *
2366          * @param $getPages Bool Whether or not to retrieve the actual pages
2367          *        that the restrictions have come from.
2368          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2369          *     have come, false for none, or true if such restrictions exist, but $getPages
2370          *     was not set.  The restriction array is an array of each type, each of which
2371          *     contains a array of unique groups.
2372          */
2373         public function getCascadeProtectionSources( $getPages = true ) {
2374                 global $wgContLang;
2375                 $pagerestrictions = array();
2376
2377                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2378                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2379                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2380                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2381                 }
2382
2383                 wfProfileIn( __METHOD__ );
2384
2385                 $dbr = wfGetDB( DB_SLAVE );
2386
2387                 if ( $this->getNamespace() == NS_FILE ) {
2388                         $tables = array( 'imagelinks', 'page_restrictions' );
2389                         $where_clauses = array(
2390                                 'il_to' => $this->getDBkey(),
2391                                 'il_from=pr_page',
2392                                 'pr_cascade' => 1
2393                         );
2394                 } else {
2395                         $tables = array( 'templatelinks', 'page_restrictions' );
2396                         $where_clauses = array(
2397                                 'tl_namespace' => $this->getNamespace(),
2398                                 'tl_title' => $this->getDBkey(),
2399                                 'tl_from=pr_page',
2400                                 'pr_cascade' => 1
2401                         );
2402                 }
2403
2404                 if ( $getPages ) {
2405                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2406                                                    'pr_expiry', 'pr_type', 'pr_level' );
2407                         $where_clauses[] = 'page_id=pr_page';
2408                         $tables[] = 'page';
2409                 } else {
2410                         $cols = array( 'pr_expiry' );
2411                 }
2412
2413                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2414
2415                 $sources = $getPages ? array() : false;
2416                 $now = wfTimestampNow();
2417                 $purgeExpired = false;
2418
2419                 foreach ( $res as $row ) {
2420                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2421                         if ( $expiry > $now ) {
2422                                 if ( $getPages ) {
2423                                         $page_id = $row->pr_page;
2424                                         $page_ns = $row->page_namespace;
2425                                         $page_title = $row->page_title;
2426                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2427                                         # Add groups needed for each restriction type if its not already there
2428                                         # Make sure this restriction type still exists
2429
2430                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2431                                                 $pagerestrictions[$row->pr_type] = array();
2432                                         }
2433
2434                                         if ( isset( $pagerestrictions[$row->pr_type] ) &&
2435                                                  !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] ) ) {
2436                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2437                                         }
2438                                 } else {
2439                                         $sources = true;
2440                                 }
2441                         } else {
2442                                 // Trigger lazy purge of expired restrictions from the db
2443                                 $purgeExpired = true;
2444                         }
2445                 }
2446                 if ( $purgeExpired ) {
2447                         Title::purgeExpiredRestrictions();
2448                 }
2449
2450                 if ( $getPages ) {
2451                         $this->mCascadeSources = $sources;
2452                         $this->mCascadingRestrictions = $pagerestrictions;
2453                 } else {
2454                         $this->mHasCascadingRestrictions = $sources;
2455                 }
2456
2457                 wfProfileOut( __METHOD__ );
2458                 return array( $sources, $pagerestrictions );
2459         }
2460
2461         /**
2462          * Accessor/initialisation for mRestrictions
2463          *
2464          * @param $action String action that permission needs to be checked for
2465          * @return Array of Strings the array of groups allowed to edit this article
2466          */
2467         public function getRestrictions( $action ) {
2468                 if ( !$this->mRestrictionsLoaded ) {
2469                         $this->loadRestrictions();
2470                 }
2471                 return isset( $this->mRestrictions[$action] )
2472                                 ? $this->mRestrictions[$action]
2473                                 : array();
2474         }
2475
2476         /**
2477          * Get the expiry time for the restriction against a given action
2478          *
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( 'wl_namespace' => $this->getNamespace(),
4322                                 'wl_title' => $this->getDBkey(),
4323                                 'wl_user' => $user->getId()
4324                         ),
4325                         __METHOD__
4326                 );
4327                 return $this->mNotificationTimestamp[$uid];
4328         }
4329
4330         /**
4331          * Generate strings used for xml 'id' names in monobook tabs
4332          *
4333          * @param $prepend string defaults to 'nstab-'
4334          * @return String XML 'id' name
4335          */
4336         public function getNamespaceKey( $prepend = 'nstab-' ) {
4337                 global $wgContLang;
4338                 // Gets the subject namespace if this title
4339                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4340                 // Checks if cononical namespace name exists for namespace
4341                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4342                         // Uses canonical namespace name
4343                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4344                 } else {
4345                         // Uses text of namespace
4346                         $namespaceKey = $this->getSubjectNsText();
4347                 }
4348                 // Makes namespace key lowercase
4349                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4350                 // Uses main
4351                 if ( $namespaceKey == '' ) {
4352                         $namespaceKey = 'main';
4353                 }
4354                 // Changes file to image for backwards compatibility
4355                 if ( $namespaceKey == 'file' ) {
4356                         $namespaceKey = 'image';
4357                 }
4358                 return $prepend . $namespaceKey;
4359         }
4360
4361         /**
4362          * Get all extant redirects to this Title
4363          *
4364          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4365          * @return Array of Title redirects to this title
4366          */
4367         public function getRedirectsHere( $ns = null ) {
4368                 $redirs = array();
4369
4370                 $dbr = wfGetDB( DB_SLAVE );
4371                 $where = array(
4372                         'rd_namespace' => $this->getNamespace(),
4373                         'rd_title' => $this->getDBkey(),
4374                         'rd_from = page_id'
4375                 );
4376                 if ( !is_null( $ns ) ) {
4377                         $where['page_namespace'] = $ns;
4378                 }
4379
4380                 $res = $dbr->select(
4381                         array( 'redirect', 'page' ),
4382                         array( 'page_namespace', 'page_title' ),
4383                         $where,
4384                         __METHOD__
4385                 );
4386
4387                 foreach ( $res as $row ) {
4388                         $redirs[] = self::newFromRow( $row );
4389                 }
4390                 return $redirs;
4391         }
4392
4393         /**
4394          * Check if this Title is a valid redirect target
4395          *
4396          * @return Bool
4397          */
4398         public function isValidRedirectTarget() {
4399                 global $wgInvalidRedirectTargets;
4400
4401                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4402                 if ( $this->isSpecial( 'Userlogout' ) ) {
4403                         return false;
4404                 }
4405
4406                 foreach ( $wgInvalidRedirectTargets as $target ) {
4407                         if ( $this->isSpecial( $target ) ) {
4408                                 return false;
4409                         }
4410                 }
4411
4412                 return true;
4413         }
4414
4415         /**
4416          * Get a backlink cache object
4417          *
4418          * @return BacklinkCache
4419          */
4420         function getBacklinkCache() {
4421                 if ( is_null( $this->mBacklinkCache ) ) {
4422                         $this->mBacklinkCache = new BacklinkCache( $this );
4423                 }
4424                 return $this->mBacklinkCache;
4425         }
4426
4427         /**
4428          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4429          *
4430          * @return Boolean
4431          */
4432         public function canUseNoindex() {
4433                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4434
4435                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4436                         ? $wgContentNamespaces
4437                         : $wgExemptFromUserRobotsControl;
4438
4439                 return !in_array( $this->mNamespace, $bannedNamespaces );
4440
4441         }
4442
4443         /**
4444          * Returns the raw sort key to be used for categories, with the specified
4445          * prefix.  This will be fed to Collation::getSortKey() to get a
4446          * binary sortkey that can be used for actual sorting.
4447          *
4448          * @param $prefix string The prefix to be used, specified using
4449          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4450          *   prefix.
4451          * @return string
4452          */
4453         public function getCategorySortkey( $prefix = '' ) {
4454                 $unprefixed = $this->getText();
4455
4456                 // Anything that uses this hook should only depend
4457                 // on the Title object passed in, and should probably
4458                 // tell the users to run updateCollations.php --force
4459                 // in order to re-sort existing category relations.
4460                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4461                 if ( $prefix !== '' ) {
4462                         # Separate with a line feed, so the unprefixed part is only used as
4463                         # a tiebreaker when two pages have the exact same prefix.
4464                         # In UCA, tab is the only character that can sort above LF
4465                         # so we strip both of them from the original prefix.
4466                         $prefix = strtr( $prefix, "\n\t", '  ' );
4467                         return "$prefix\n$unprefixed";
4468                 }
4469                 return $unprefixed;
4470         }
4471
4472         /**
4473          * Get the language in which the content of this page is written.
4474          * Defaults to $wgContLang, but in certain cases it can be e.g.
4475          * $wgLang (such as special pages, which are in the user language).
4476          *
4477          * @since 1.18
4478          * @return object Language
4479          */
4480         public function getPageLanguage() {
4481                 global $wgLang;
4482                 if ( $this->isSpecialPage() ) {
4483                         // special pages are in the user language
4484                         return $wgLang;
4485                 } elseif ( $this->isCssOrJsPage() || $this->isCssJsSubpage() ) {
4486                         // css/js should always be LTR and is, in fact, English
4487                         return wfGetLangObj( 'en' );
4488                 } elseif ( $this->getNamespace() == NS_MEDIAWIKI ) {
4489                         // Parse mediawiki messages with correct target language
4490                         list( /* $unused */, $lang ) = MessageCache::singleton()->figureMessage( $this->getText() );
4491                         return wfGetLangObj( $lang );
4492                 }
4493                 global $wgContLang;
4494                 // If nothing special, it should be in the wiki content language
4495                 $pageLang = $wgContLang;
4496                 // Hook at the end because we don't want to override the above stuff
4497                 wfRunHooks( 'PageContentLanguage', array( $this, &$pageLang, $wgLang ) );
4498                 return wfGetLangObj( $pageLang );
4499         }
4500 }