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