includes/Title.php

   1 <?php
   2 /**
   3  * Representation a title within %MediaWiki.
   4  *
   5  * See title.txt
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  */
  24
  25 /**
  26  * Represents a title within MediaWiki.
  27  * Optionally may contain an interwiki designation or namespace.
  28  * @note This class can fetch various kinds of data from the database;
  29  *       however, it does so inefficiently.
  30  *
  31  * @internal documentation reviewed 15 Mar 2010
  32  */
  33 class Title {
  34         /** @name Static cache variables */
  35         // @{
  36         static private $titleCache = array();
  37         // @}
  38
  39         /**
  40          * Title::newFromText maintains a cache to avoid expensive re-normalization of
  41          * commonly used titles. On a batch operation this can become a memory leak
  42          * if not bounded. After hitting this many titles reset the cache.
  43          */
  44         const CACHE_MAX = 1000;
  45
  46         /**
  47          * Used to be GAID_FOR_UPDATE define. Used with getArticleID() and friends
  48          * to use the master DB
  49          */
  50         const GAID_FOR_UPDATE = 1;
  51
  52         /**
  53          * @name Private member variables
  54          * Please use the accessor functions instead.
  55          * @private
  56          */
  57         // @{
  58
  59         var $mTextform = '';              // /< Text form (spaces not underscores) of the main part
  60         var $mUrlform = '';               // /< URL-encoded form of the main part
  61         var $mDbkeyform = '';             // /< Main part with underscores
  62         var $mUserCaseDBKey;              // /< DB key with the initial letter in the case specified by the user
  63         var $mNamespace = NS_MAIN;        // /< Namespace index, i.e. one of the NS_xxxx constants
  64         var $mInterwiki = '';             // /< Interwiki prefix (or null string)
  65         var $mFragment;                   // /< Title fragment (i.e. the bit after the #)
  66         var $mArticleID = -1;             // /< Article ID, fetched from the link cache on demand
  67         var $mLatestID = false;           // /< ID of most recent revision
  68         var $mContentModel = false;       // /< ID of the page's content model, i.e. one of the CONTENT_MODEL_XXX constants
  69         private $mEstimateRevisions;      // /< Estimated number of revisions; null of not loaded
  70         var $mRestrictions = array();     // /< Array of groups allowed to edit this article
  71         var $mOldRestrictions = false;
  72         var $mCascadeRestriction;         ///< Cascade restrictions on this page to included templates and images?
  73         var $mCascadingRestrictions;      // Caching the results of getCascadeProtectionSources
  74         var $mRestrictionsExpiry = array(); ///< When do the restrictions on this page expire?
  75         var $mHasCascadingRestrictions;   ///< Are cascading restrictions in effect on this page?
  76         var $mCascadeSources;             ///< Where are the cascading restrictions coming from on this page?
  77         var $mRestrictionsLoaded = false; ///< Boolean for initialisation on demand
  78         var $mPrefixedText;               ///< Text form including namespace/interwiki, initialised on demand
  79         var $mTitleProtection;            ///< Cached value for getTitleProtection (create protection)
  80         # Don't change the following default, NS_MAIN is hardcoded in several
  81         # places.  See bug 696.
  82         var $mDefaultNamespace = NS_MAIN; // /< Namespace index when there is no namespace
  83                                                                           # Zero except in {{transclusion}} tags
  84         var $mWatched = null;             // /< Is $wgUser watching this page? null if unfilled, accessed through userIsWatching()
  85         var $mLength = -1;                // /< The page length, 0 for special pages
  86         var $mRedirect = null;            // /< Is the article at this title a redirect?
  87         var $mNotificationTimestamp = array(); // /< Associative array of user ID -> timestamp/false
  88         var $mBacklinkCache = null;       // /< Cache of links to this title
  89         var $mHasSubpage;                 // /< Whether a page has any subpages
  90         // @}
  91
  92
  93         /**
  94          * Constructor
  95          */
  96         /*protected*/ function __construct() { }
  97
  98         /**
  99          * Create a new Title from a prefixed DB key
 100          *
 101          * @param $key String the database key, which has underscores
 102          *      instead of spaces, possibly including namespace and
 103          *      interwiki prefixes
 104          * @return Title, or NULL on an error
 105          */
 106         public static function newFromDBkey( $key ) {
 107                 $t = new Title();
 108                 $t->mDbkeyform = $key;
 109                 if ( $t->secureAndSplit() ) {
 110                         return $t;
 111                 } else {
 112                         return null;
 113                 }
 114         }
 115
 116         /**
 117          * Create a new Title from text, such as what one would find in a link. De-
 118          * codes any HTML entities in the text.
 119          *
 120          * @param $text String the link text; spaces, prefixes, and an
 121          *   initial ':' indicating the main namespace are accepted.
 122          * @param $defaultNamespace Int the namespace to use if none is speci-
 123          *   fied by a prefix.  If you want to force a specific namespace even if
 124          *   $text might begin with a namespace prefix, use makeTitle() or
 125          *   makeTitleSafe().
 126          * @throws MWException
 127          * @return Title|null - Title or null on an error.
 128          */
 129         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 130                 if ( is_object( $text ) ) {
 131                         throw new MWException( 'Title::newFromText given an object' );
 132                 }
 133
 134                 /**
 135                  * Wiki pages often contain multiple links to the same page.
 136                  * Title normalization and parsing can become expensive on
 137                  * pages with many links, so we can save a little time by
 138                  * caching them.
 139                  *
 140                  * In theory these are value objects and won't get changed...
 141                  */
 142                 if ( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 143                         return Title::$titleCache[$text];
 144                 }
 145
 146                 # Convert things like &eacute; &#257; or &#x3017; into normalized (bug 14952) text
 147                 $filteredText = Sanitizer::decodeCharReferencesAndNormalize( $text );
 148
 149                 $t = new Title();
 150                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 151                 $t->mDefaultNamespace = $defaultNamespace;
 152
 153                 static $cachedcount = 0 ;
 154                 if ( $t->secureAndSplit() ) {
 155                         if ( $defaultNamespace == NS_MAIN ) {
 156                                 if ( $cachedcount >= self::CACHE_MAX ) {
 157                                         # Avoid memory leaks on mass operations...
 158                                         Title::$titleCache = array();
 159                                         $cachedcount = 0;
 160                                 }
 161                                 $cachedcount++;
 162                                 Title::$titleCache[$text] =& $t;
 163                         }
 164                         return $t;
 165                 } else {
 166                         $ret = null;
 167                         return $ret;
 168                 }
 169         }
 170
 171         /**
 172          * THIS IS NOT THE FUNCTION YOU WANT. Use Title::newFromText().
 173          *
 174          * Example of wrong and broken code:
 175          * $title = Title::newFromURL( $wgRequest->getVal( 'title' ) );
 176          *
 177          * Example of right code:
 178          * $title = Title::newFromText( $wgRequest->getVal( 'title' ) );
 179          *
 180          * Create a new Title from URL-encoded text. Ensures that
 181          * the given title's length does not exceed the maximum.
 182          *
 183          * @param $url String the title, as might be taken from a URL
 184          * @return Title the new object, or NULL on an error
 185          */
 186         public static function newFromURL( $url ) {
 187                 $t = new Title();
 188
 189                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 190                 # but some URLs used it as a space replacement and they still come
 191                 # from some external search tools.
 192                 if ( strpos( self::legalChars(), '+' ) === false ) {
 193                         $url = str_replace( '+', ' ', $url );
 194                 }
 195
 196                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 197                 if ( $t->secureAndSplit() ) {
 198                         return $t;
 199                 } else {
 200                         return null;
 201                 }
 202         }
 203
 204         /**
 205          * Create a new Title from an article ID
 206          *
 207          * @param $id Int the page_id corresponding to the Title to create
 208          * @param $flags Int use Title::GAID_FOR_UPDATE to use master
 209          * @return Title the new object, or NULL on an error
 210          */
 211         public static function newFromID( $id, $flags = 0 ) {
 212                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
 213                 $row = $db->selectRow(
 214                         'page',
 215                         array(
 216                                 'page_namespace', 'page_title', 'page_id',
 217                                 'page_len', 'page_is_redirect', 'page_latest',
 218                         ),
 219                         array( 'page_id' => $id ),
 220                         __METHOD__
 221                 );
 222                 if ( $row !== false ) {
 223                         $title = Title::newFromRow( $row );
 224                 } else {
 225                         $title = null;
 226                 }
 227                 return $title;
 228         }
 229
 230         /**
 231          * Make an array of titles from an array of IDs
 232          *
 233          * @param $ids Array of Int Array of IDs
 234          * @return Array of Titles
 235          */
 236         public static function newFromIDs( $ids ) {
 237                 if ( !count( $ids ) ) {
 238                         return array();
 239                 }
 240                 $dbr = wfGetDB( DB_SLAVE );
 241
 242                 $res = $dbr->select(
 243                         'page',
 244                         array(
 245                                 'page_namespace', 'page_title', 'page_id',
 246                                 'page_len', 'page_is_redirect', 'page_latest',
 247                         ),
 248                         array( 'page_id' => $ids ),
 249                         __METHOD__
 250                 );
 251
 252                 $titles = array();
 253                 foreach ( $res as $row ) {
 254                         $titles[] = Title::newFromRow( $row );
 255                 }
 256                 return $titles;
 257         }
 258
 259         /**
 260          * Make a Title object from a DB row
 261          *
 262          * @param $row Object database row (needs at least page_title,page_namespace)
 263          * @return Title corresponding Title
 264          */
 265         public static function newFromRow( $row ) {
 266                 $t = self::makeTitle( $row->page_namespace, $row->page_title );
 267                 $t->loadFromRow( $row );
 268                 return $t;
 269         }
 270
 271         /**
 272          * Load Title object fields from a DB row.
 273          * If false is given, the title will be treated as non-existing.
 274          *
 275          * @param $row Object|bool database row
 276          */
 277         public function loadFromRow( $row ) {
 278                 if ( $row ) { // page found
 279                         if ( isset( $row->page_id ) )
 280                                 $this->mArticleID = (int)$row->page_id;
 281                         if ( isset( $row->page_len ) )
 282                                 $this->mLength = (int)$row->page_len;
 283                         if ( isset( $row->page_is_redirect ) )
 284                                 $this->mRedirect = (bool)$row->page_is_redirect;
 285                         if ( isset( $row->page_latest ) )
 286                                 $this->mLatestID = (int)$row->page_latest; # FIXME: whene3ver page_latest is updated, also update page_content_model
 287                         if ( isset( $row->page_content_model ) )
 288                                 $this->mContentModel = intval( $row->page_content_model );
 289                         else
 290                                 $this->mContentModel = null; # initialized lazily in getContentModel()
 291                 } else { // page not found
 292                         $this->mArticleID = 0;
 293                         $this->mLength = 0;
 294                         $this->mRedirect = false;
 295                         $this->mLatestID = 0;
 296                         $this->mContentModel = null; # initialized lazily in getContentModel()
 297                 }
 298         }
 299
 300         /**
 301          * Create a new Title from a namespace index and a DB key.
 302          * It's assumed that $ns and $title are *valid*, for instance when
 303          * they came directly from the database or a special page name.
 304          * For convenience, spaces are converted to underscores so that
 305          * eg user_text fields can be used directly.
 306          *
 307          * @param $ns Int the namespace of the article
 308          * @param $title String the unprefixed database key form
 309          * @param $fragment String the link fragment (after the "#")
 310          * @param $interwiki String the interwiki prefix
 311          * @return Title the new object
 312          */
 313         public static function &makeTitle( $ns, $title, $fragment = '', $interwiki = '' ) {
 314                 $t = new Title();
 315                 $t->mInterwiki = $interwiki;
 316                 $t->mFragment = $fragment;
 317                 $t->mNamespace = $ns = intval( $ns );
 318                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 319                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 320                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 321                 $t->mTextform = str_replace( '_', ' ', $title );
 322                 $t->mContentModel = null; # initialized lazily in getContentModel()
 323                 return $t;
 324         }
 325
 326         /**
 327          * Create a new Title from a namespace index and a DB key.
 328          * The parameters will be checked for validity, which is a bit slower
 329          * than makeTitle() but safer for user-provided data.
 330          *
 331          * @param $ns Int the namespace of the article
 332          * @param $title String database key form
 333          * @param $fragment String the link fragment (after the "#")
 334          * @param $interwiki String interwiki prefix
 335          * @return Title the new object, or NULL on an error
 336          */
 337         public static function makeTitleSafe( $ns, $title, $fragment = '', $interwiki = '' ) {
 338                 if ( !MWNamespace::exists( $ns ) ) {
 339                         return null;
 340                 }
 341
 342                 $t = new Title();
 343                 $t->mDbkeyform = Title::makeName( $ns, $title, $fragment, $interwiki );
 344                 if ( $t->secureAndSplit() ) {
 345                         return $t;
 346                 } else {
 347                         return null;
 348                 }
 349         }
 350
 351         /**
 352          * Create a new Title for the Main Page
 353          *
 354          * @return Title the new object
 355          */
 356         public static function newMainPage() {
 357                 $title = Title::newFromText( wfMsgForContent( 'mainpage' ) );
 358                 // Don't give fatal errors if the message is broken
 359                 if ( !$title ) {
 360                         $title = Title::newFromText( 'Main Page' );
 361                 }
 362                 return $title;
 363         }
 364
 365         /**
 366          * Extract a redirect destination from a string and return the
 367          * Title, or null if the text doesn't contain a valid redirect
 368          * This will only return the very next target, useful for
 369          * the redirect table and other checks that don't need full recursion
 370          *
 371          * @param $text String: Text with possible redirect
 372          * @return Title: The corresponding Title
 373          * @deprecated since 1.WD, use Content::getRedirectTarget instead.
 374          */
 375         public static function newFromRedirect( $text ) {
 376                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 377                 return $content->getRedirectTarget();
 378         }
 379
 380         /**
 381          * Extract a redirect destination from a string and return the
 382          * Title, or null if the text doesn't contain a valid redirect
 383          * This will recurse down $wgMaxRedirects times or until a non-redirect target is hit
 384          * in order to provide (hopefully) the Title of the final destination instead of another redirect
 385          *
 386          * @param $text String Text with possible redirect
 387          * @return Title
 388          * @deprecated since 1.WD, use Content::getUltimateRedirectTarget instead.
 389          */
 390         public static function newFromRedirectRecurse( $text ) {
 391                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 392                 return $content->getUltimateRedirectTarget();
 393         }
 394
 395         /**
 396          * Extract a redirect destination from a string and return an
 397          * array of Titles, or null if the text doesn't contain a valid redirect
 398          * The last element in the array is the final destination after all redirects
 399          * have been resolved (up to $wgMaxRedirects times)
 400          *
 401          * @param $text String Text with possible redirect
 402          * @return Array of Titles, with the destination last
 403          * @deprecated since 1.WD, use Content::getRedirectChain instead.
 404          * @todo: migrate this logic into WikitextContent!
 405          */
 406         public static function newFromRedirectArray( $text ) {
 407                 $content = ContentHandler::makeContent( $text, null, CONTENT_MODEL_WIKITEXT );
 408                 return $content->getRedirectChain();
 409         }
 410
 411         /**
 412          * Get the prefixed DB key associated with an ID
 413          *
 414          * @param $id Int the page_id of the article
 415          * @return Title an object representing the article, or NULL if no such article was found
 416          */
 417         public static function nameOf( $id ) {
 418                 $dbr = wfGetDB( DB_SLAVE );
 419
 420                 $s = $dbr->selectRow(
 421                         'page',
 422                         array( 'page_namespace', 'page_title' ),
 423                         array( 'page_id' => $id ),
 424                         __METHOD__
 425                 );
 426                 if ( $s === false ) {
 427                         return null;
 428                 }
 429
 430                 $n = self::makeName( $s->page_namespace, $s->page_title );
 431                 return $n;
 432         }
 433
 434         /**
 435          * Get a regex character class describing the legal characters in a link
 436          *
 437          * @return String the list of characters, not delimited
 438          */
 439         public static function legalChars() {
 440                 global $wgLegalTitleChars;
 441                 return $wgLegalTitleChars;
 442         }
 443
 444         /**
 445          * Returns a simple regex that will match on characters and sequences invalid in titles.
 446          * Note that this doesn't pick up many things that could be wrong with titles, but that
 447          * replacing this regex with something valid will make many titles valid.
 448          *
 449          * @return String regex string
 450          */
 451         static function getTitleInvalidRegex() {
 452                 static $rxTc = false;
 453                 if ( !$rxTc ) {
 454                         # Matching titles will be held as illegal.
 455                         $rxTc = '/' .
 456                                 # Any character not allowed is forbidden...
 457                                 '[^' . self::legalChars() . ']' .
 458                                 # URL percent encoding sequences interfere with the ability
 459                                 # to round-trip titles -- you can't link to them consistently.
 460                                 '|%[0-9A-Fa-f]{2}' .
 461                                 # XML/HTML character references produce similar issues.
 462                                 '|&[A-Za-z0-9\x80-\xff]+;' .
 463                                 '|&#[0-9]+;' .
 464                                 '|&#x[0-9A-Fa-f]+;' .
 465                                 '/S';
 466                 }
 467
 468                 return $rxTc;
 469         }
 470
 471         /**
 472          * Get a string representation of a title suitable for
 473          * including in a search index
 474          *
 475          * @param $ns Int a namespace index
 476          * @param $title String text-form main part
 477          * @return String a stripped-down title string ready for the search index
 478          */
 479         public static function indexTitle( $ns, $title ) {
 480                 global $wgContLang;
 481
 482                 $lc = SearchEngine::legalSearchChars() . '&#;';
 483                 $t = $wgContLang->normalizeForSearch( $title );
 484                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 485                 $t = $wgContLang->lc( $t );
 486
 487                 # Handle 's, s'
 488                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 489                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 490
 491                 $t = preg_replace( "/\\s+/", ' ', $t );
 492
 493                 if ( $ns == NS_FILE ) {
 494                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 495                 }
 496                 return trim( $t );
 497         }
 498
 499         /**
 500          * Make a prefixed DB key from a DB key and a namespace index
 501          *
 502          * @param $ns Int numerical representation of the namespace
 503          * @param $title String the DB key form the title
 504          * @param $fragment String The link fragment (after the "#")
 505          * @param $interwiki String The interwiki prefix
 506          * @return String the prefixed form of the title
 507          */
 508         public static function makeName( $ns, $title, $fragment = '', $interwiki = '' ) {
 509                 global $wgContLang;
 510
 511                 $namespace = $wgContLang->getNsText( $ns );
 512                 $name = $namespace == '' ? $title : "$namespace:$title";
 513                 if ( strval( $interwiki ) != '' ) {
 514                         $name = "$interwiki:$name";
 515                 }
 516                 if ( strval( $fragment ) != '' ) {
 517                         $name .= '#' . $fragment;
 518                 }
 519                 return $name;
 520         }
 521
 522         /**
 523          * Escape a text fragment, say from a link, for a URL
 524          *
 525          * @param $fragment string containing a URL or link fragment (after the "#")
 526          * @return String: escaped string
 527          */
 528         static function escapeFragmentForURL( $fragment ) {
 529                 # Note that we don't urlencode the fragment.  urlencoded Unicode
 530                 # fragments appear not to work in IE (at least up to 7) or in at least
 531                 # one version of Opera 9.x.  The W3C validator, for one, doesn't seem
 532                 # to care if they aren't encoded.
 533                 return Sanitizer::escapeId( $fragment, 'noninitial' );
 534         }
 535
 536         /**
 537          * Callback for usort() to do title sorts by (namespace, title)
 538          *
 539          * @param $a Title
 540          * @param $b Title
 541          *
 542          * @return Integer: result of string comparison, or namespace comparison
 543          */
 544         public static function compare( $a, $b ) {
 545                 if ( $a->getNamespace() == $b->getNamespace() ) {
 546                         return strcmp( $a->getText(), $b->getText() );
 547                 } else {
 548                         return $a->getNamespace() - $b->getNamespace();
 549                 }
 550         }
 551
 552         /**
 553          * Determine whether the object refers to a page within
 554          * this project.
 555          *
 556          * @return Bool TRUE if this is an in-project interwiki link or a wikilink, FALSE otherwise
 557          */
 558         public function isLocal() {
 559                 if ( $this->mInterwiki != '' ) {
 560                         return Interwiki::fetch( $this->mInterwiki )->isLocal();
 561                 } else {
 562                         return true;
 563                 }
 564         }
 565
 566         /**
 567          * Is this Title interwiki?
 568          *
 569          * @return Bool
 570          */
 571         public function isExternal() {
 572                 return ( $this->mInterwiki != '' );
 573         }
 574
 575         /**
 576          * Get the interwiki prefix (or null string)
 577          *
 578          * @return String Interwiki prefix
 579          */
 580         public function getInterwiki() {
 581                 return $this->mInterwiki;
 582         }
 583
 584         /**
 585          * Determine whether the object refers to a page within
 586          * this project and is transcludable.
 587          *
 588          * @return Bool TRUE if this is transcludable
 589          */
 590         public function isTrans() {
 591                 if ( $this->mInterwiki == '' ) {
 592                         return false;
 593                 }
 594
 595                 return Interwiki::fetch( $this->mInterwiki )->isTranscludable();
 596         }
 597
 598         /**
 599          * Returns the DB name of the distant wiki which owns the object.
 600          *
 601          * @return String the DB name
 602          */
 603         public function getTransWikiID() {
 604                 if ( $this->mInterwiki == '' ) {
 605                         return false;
 606                 }
 607
 608                 return Interwiki::fetch( $this->mInterwiki )->getWikiID();
 609         }
 610
 611         /**
 612          * Get the text form (spaces not underscores) of the main part
 613          *
 614          * @return String Main part of the title
 615          */
 616         public function getText() {
 617                 return $this->mTextform;
 618         }
 619
 620         /**
 621          * Get the URL-encoded form of the main part
 622          *
 623          * @return String Main part of the title, URL-encoded
 624          */
 625         public function getPartialURL() {
 626                 return $this->mUrlform;
 627         }
 628
 629         /**
 630          * Get the main part with underscores
 631          *
 632          * @return String: Main part of the title, with underscores
 633          */
 634         public function getDBkey() {
 635                 return $this->mDbkeyform;
 636         }
 637
 638         /**
 639          * Get the DB key with the initial letter case as specified by the user
 640          *
 641          * @return String DB key
 642          */
 643         function getUserCaseDBKey() {
 644                 return $this->mUserCaseDBKey;
 645         }
 646
 647         /**
 648          * Get the namespace index, i.e. one of the NS_xxxx constants.
 649          *
 650          * @return Integer: Namespace index
 651          */
 652         public function getNamespace() {
 653                 return $this->mNamespace;
 654         }
 655
 656         /**
 657          * Get the page's content model id, see the CONTENT_MODEL_XXX constants.
 658          *
 659          * @return Integer: Content model id
 660          */
 661         public function getContentModel() {
 662                 if ( empty( $this->mContentModel ) ) {
 663                         $this->mContentModel = ContentHandler::getDefaultModelFor( $this );
 664                 }
 665
 666                 assert( !empty( $this->mContentModel ) );
 667                 return $this->mContentModel;
 668         }
 669
 670         /**
 671          * Convenience method for checking a title's content model name
 672          *
 673          * @param int $id
 674          * @return true if $this->getContentModel() == $id
 675          */
 676         public function hasContentModel( $id ) {
 677                 return $this->getContentModel() == $id;
 678         }
 679
 680         /**
 681          * Get the namespace text
 682          *
 683          * @return String: Namespace text
 684          */
 685         public function getNsText() {
 686                 global $wgContLang;
 687
 688                 if ( $this->mInterwiki != '' ) {
 689                         // This probably shouldn't even happen. ohh man, oh yuck.
 690                         // But for interwiki transclusion it sometimes does.
 691                         // Shit. Shit shit shit.
 692                         //
 693                         // Use the canonical namespaces if possible to try to
 694                         // resolve a foreign namespace.
 695                         if ( MWNamespace::exists( $this->mNamespace ) ) {
 696                                 return MWNamespace::getCanonicalName( $this->mNamespace );
 697                         }
 698                 }
 699
 700                 if ( $wgContLang->needsGenderDistinction() &&
 701                                 MWNamespace::hasGenderDistinction( $this->mNamespace ) ) {
 702                         $gender = GenderCache::singleton()->getGenderOf( $this->getText(), __METHOD__ );
 703                         return $wgContLang->getGenderNsText( $this->mNamespace, $gender );
 704                 }
 705
 706                 return $wgContLang->getNsText( $this->mNamespace );
 707         }
 708
 709         /**
 710          * Get the namespace text of the subject (rather than talk) page
 711          *
 712          * @return String Namespace text
 713          */
 714         public function getSubjectNsText() {
 715                 global $wgContLang;
 716                 return $wgContLang->getNsText( MWNamespace::getSubject( $this->mNamespace ) );
 717         }
 718
 719         /**
 720          * Get the namespace text of the talk page
 721          *
 722          * @return String Namespace text
 723          */
 724         public function getTalkNsText() {
 725                 global $wgContLang;
 726                 return( $wgContLang->getNsText( MWNamespace::getTalk( $this->mNamespace ) ) );
 727         }
 728
 729         /**
 730          * Could this title have a corresponding talk page?
 731          *
 732          * @return Bool TRUE or FALSE
 733          */
 734         public function canTalk() {
 735                 return( MWNamespace::canTalk( $this->mNamespace ) );
 736         }
 737
 738         /**
 739          * Is this in a namespace that allows actual pages?
 740          *
 741          * @return Bool
 742          * @internal note -- uses hardcoded namespace index instead of constants
 743          */
 744         public function canExist() {
 745                 return $this->mNamespace >= NS_MAIN;
 746         }
 747
 748         /**
 749          * Can this title be added to a user's watchlist?
 750          *
 751          * @return Bool TRUE or FALSE
 752          */
 753         public function isWatchable() {
 754                 return !$this->isExternal() && MWNamespace::isWatchable( $this->getNamespace() );
 755         }
 756
 757         /**
 758          * Returns true if this is a special page.
 759          *
 760          * @return boolean
 761          */
 762         public function isSpecialPage() {
 763                 return $this->getNamespace() == NS_SPECIAL;
 764         }
 765
 766         /**
 767          * Returns true if this title resolves to the named special page
 768          *
 769          * @param $name String The special page name
 770          * @return boolean
 771          */
 772         public function isSpecial( $name ) {
 773                 if ( $this->isSpecialPage() ) {
 774                         list( $thisName, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $this->getDBkey() );
 775                         if ( $name == $thisName ) {
 776                                 return true;
 777                         }
 778                 }
 779                 return false;
 780         }
 781
 782         /**
 783          * If the Title refers to a special page alias which is not the local default, resolve
 784          * the alias, and localise the name as necessary.  Otherwise, return $this
 785          *
 786          * @return Title
 787          */
 788         public function fixSpecialName() {
 789                 if ( $this->isSpecialPage() ) {
 790                         list( $canonicalName, $par ) = SpecialPageFactory::resolveAlias( $this->mDbkeyform );
 791                         if ( $canonicalName ) {
 792                                 $localName = SpecialPageFactory::getLocalNameFor( $canonicalName, $par );
 793                                 if ( $localName != $this->mDbkeyform ) {
 794                                         return Title::makeTitle( NS_SPECIAL, $localName );
 795                                 }
 796                         }
 797                 }
 798                 return $this;
 799         }
 800
 801         /**
 802          * Returns true if the title is inside the specified namespace.
 803          *
 804          * Please make use of this instead of comparing to getNamespace()
 805          * This function is much more resistant to changes we may make
 806          * to namespaces than code that makes direct comparisons.
 807          * @param $ns int The namespace
 808          * @return bool
 809          * @since 1.19
 810          */
 811         public function inNamespace( $ns ) {
 812                 return MWNamespace::equals( $this->getNamespace(), $ns );
 813         }
 814
 815         /**
 816          * Returns true if the title is inside one of the specified namespaces.
 817          *
 818          * @param ...$namespaces The namespaces to check for
 819          * @return bool
 820          * @since 1.19
 821          */
 822         public function inNamespaces( /* ... */ ) {
 823                 $namespaces = func_get_args();
 824                 if ( count( $namespaces ) > 0 && is_array( $namespaces[0] ) ) {
 825                         $namespaces = $namespaces[0];
 826                 }
 827
 828                 foreach ( $namespaces as $ns ) {
 829                         if ( $this->inNamespace( $ns ) ) {
 830                                 return true;
 831                         }
 832                 }
 833
 834                 return false;
 835         }
 836
 837         /**
 838          * Returns true if the title has the same subject namespace as the
 839          * namespace specified.
 840          * For example this method will take NS_USER and return true if namespace
 841          * is either NS_USER or NS_USER_TALK since both of them have NS_USER
 842          * as their subject namespace.
 843          *
 844          * This is MUCH simpler than individually testing for equivilance
 845          * against both NS_USER and NS_USER_TALK, and is also forward compatible.
 846          * @since 1.19
 847          * @param $ns int
 848          * @return bool
 849          */
 850         public function hasSubjectNamespace( $ns ) {
 851                 return MWNamespace::subjectEquals( $this->getNamespace(), $ns );
 852         }
 853
 854         /**
 855          * Is this Title in a namespace which contains content?
 856          * In other words, is this a content page, for the purposes of calculating
 857          * statistics, etc?
 858          *
 859          * @return Boolean
 860          */
 861         public function isContentPage() {
 862                 return MWNamespace::isContent( $this->getNamespace() );
 863         }
 864
 865         /**
 866          * Would anybody with sufficient privileges be able to move this page?
 867          * Some pages just aren't movable.
 868          *
 869          * @return Bool TRUE or FALSE
 870          */
 871         public function isMovable() {
 872                 if ( !MWNamespace::isMovable( $this->getNamespace() ) || $this->getInterwiki() != '' ) {
 873                         // Interwiki title or immovable namespace. Hooks don't get to override here
 874                         return false;
 875                 }
 876
 877                 $result = true;
 878                 wfRunHooks( 'TitleIsMovable', array( $this, &$result ) );
 879                 return $result;
 880         }
 881
 882         /**
 883          * Is this the mainpage?
 884          * @note Title::newFromText seams to be sufficiently optimized by the title
 885          * cache that we don't need to over-optimize by doing direct comparisons and
 886          * acidentally creating new bugs where $title->equals( Title::newFromText() )
 887          * ends up reporting something differently than $title->isMainPage();
 888          *
 889          * @since 1.18
 890          * @return Bool
 891          */
 892         public function isMainPage() {
 893                 return $this->equals( Title::newMainPage() );
 894         }
 895
 896         /**
 897          * Is this a subpage?
 898          *
 899          * @return Bool
 900          */
 901         public function isSubpage() {
 902                 return MWNamespace::hasSubpages( $this->mNamespace )
 903                         ? strpos( $this->getText(), '/' ) !== false
 904                         : false;
 905         }
 906
 907         /**
 908          * Is this a conversion table for the LanguageConverter?
 909          *
 910          * @return Bool
 911          */
 912         public function isConversionTable() {
 913                 return $this->getNamespace() == NS_MEDIAWIKI &&
 914                         strpos( $this->getText(), 'Conversiontable' ) !== false;
 915         }
 916
 917         /**
 918          * Does that page contain wikitext, or it is JS, CSS or whatever?
 919          *
 920          * @return Bool
 921          */
 922         public function isWikitextPage() {
 923                 return $this->hasContentModel( CONTENT_MODEL_WIKITEXT );
 924         }
 925
 926         /**
 927          * Could this page contain custom CSS or JavaScript for the global UI.
 928          * This is generally true for pages in the MediaWiki namespace having CONTENT_MODEL_CSS
 929          * or CONTENT_MODEL_JAVASCRIPT.
 930          *
 931          * This method does *not* return true for per-user JS/CSS. Use isCssJsSubpage() for that!
 932          *
 933          * Note that this method should not return true for pages that contain and show "inactive" CSS or JS.
 934          *
 935          * @return Bool
 936          */
 937         public function isCssOrJsPage() {
 938                 $isCssOrJsPage = NS_MEDIAWIKI == $this->mNamespace
 939                         && ( $this->hasContentModel( CONTENT_MODEL_CSS )
 940                                 || $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) );
 941
 942                 #NOTE: this hook is also called in ContentHandler::getDefaultModel. It's called here again to make sure
 943                 #      hook funktions can force this method to return true even outside the mediawiki namespace.
 944
 945                 wfRunHooks( 'TitleIsCssOrJsPage', array( $this, &$isCssOrJsPage ) );
 946
 947                 return $isCssOrJsPage;
 948         }
 949
 950         /**
 951          * Is this a .css or .js subpage of a user page?
 952          * @return Bool
 953          */
 954         public function isCssJsSubpage() {
 955                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
 956                                 && ( $this->hasContentModel( CONTENT_MODEL_CSS )
 957                                         || $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) ) );
 958         }
 959
 960         /**
 961          * Trim down a .css or .js subpage title to get the corresponding skin name
 962          *
 963          * @return string containing skin name from .css or .js subpage title
 964          */
 965         public function getSkinFromCssJsSubpage() {
 966                 $subpage = explode( '/', $this->mTextform );
 967                 $subpage = $subpage[ count( $subpage ) - 1 ];
 968                 $lastdot = strrpos( $subpage, '.' );
 969                 if ( $lastdot === false )
 970                         return $subpage; # Never happens: only called for names ending in '.css' or '.js'
 971                 return substr( $subpage, 0, $lastdot );
 972         }
 973
 974         /**
 975          * Is this a .css subpage of a user page?
 976          *
 977          * @return Bool
 978          */
 979         public function isCssSubpage() {
 980                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
 981                         && $this->hasContentModel( CONTENT_MODEL_CSS ) );
 982         }
 983
 984         /**
 985          * Is this a .js subpage of a user page?
 986          *
 987          * @return Bool
 988          */
 989         public function isJsSubpage() {
 990                 return ( NS_USER == $this->mNamespace && $this->isSubpage()
 991                         && $this->hasContentModel( CONTENT_MODEL_JAVASCRIPT ) );
 992         }
 993
 994         /**
 995          * Is this a talk page of some sort?
 996          *
 997          * @return Bool
 998          */
 999         public function isTalkPage() {
1000                 return MWNamespace::isTalk( $this->getNamespace() );
1001         }
1002
1003         /**
1004          * Get a Title object associated with the talk page of this article
1005          *
1006          * @return Title the object for the talk page
1007          */
1008         public function getTalkPage() {
1009                 return Title::makeTitle( MWNamespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1010         }
1011
1012         /**
1013          * Get a title object associated with the subject page of this
1014          * talk page
1015          *
1016          * @return Title the object for the subject page
1017          */
1018         public function getSubjectPage() {
1019                 // Is this the same title?
1020                 $subjectNS = MWNamespace::getSubject( $this->getNamespace() );
1021                 if ( $this->getNamespace() == $subjectNS ) {
1022                         return $this;
1023                 }
1024                 return Title::makeTitle( $subjectNS, $this->getDBkey() );
1025         }
1026
1027         /**
1028          * Get the default namespace index, for when there is no namespace
1029          *
1030          * @return Int Default namespace index
1031          */
1032         public function getDefaultNamespace() {
1033                 return $this->mDefaultNamespace;
1034         }
1035
1036         /**
1037          * Get title for search index
1038          *
1039          * @return String a stripped-down title string ready for the
1040          *  search index
1041          */
1042         public function getIndexTitle() {
1043                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
1044         }
1045
1046         /**
1047          * Get the Title fragment (i.e.\ the bit after the #) in text form
1048          *
1049          * @return String Title fragment
1050          */
1051         public function getFragment() {
1052                 return $this->mFragment;
1053         }
1054
1055         /**
1056          * Get the fragment in URL form, including the "#" character if there is one
1057          * @return String Fragment in URL form
1058          */
1059         public function getFragmentForURL() {
1060                 if ( $this->mFragment == '' ) {
1061                         return '';
1062                 } else {
1063                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
1064                 }
1065         }
1066
1067         /**
1068          * Set the fragment for this title. Removes the first character from the
1069          * specified fragment before setting, so it assumes you're passing it with
1070          * an initial "#".
1071          *
1072          * Deprecated for public use, use Title::makeTitle() with fragment parameter.
1073          * Still in active use privately.
1074          *
1075          * @param $fragment String text
1076          */
1077         public function setFragment( $fragment ) {
1078                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1079         }
1080
1081         /**
1082          * Prefix some arbitrary text with the namespace or interwiki prefix
1083          * of this object
1084          *
1085          * @param $name String the text
1086          * @return String the prefixed text
1087          * @private
1088          */
1089         private function prefix( $name ) {
1090                 $p = '';
1091                 if ( $this->mInterwiki != '' ) {
1092                         $p = $this->mInterwiki . ':';
1093                 }
1094
1095                 if ( 0 != $this->mNamespace ) {
1096                         $p .= $this->getNsText() . ':';
1097                 }
1098                 return $p . $name;
1099         }
1100
1101         /**
1102          * Get the prefixed database key form
1103          *
1104          * @return String the prefixed title, with underscores and
1105          *  any interwiki and namespace prefixes
1106          */
1107         public function getPrefixedDBkey() {
1108                 $s = $this->prefix( $this->mDbkeyform );
1109                 $s = str_replace( ' ', '_', $s );
1110                 return $s;
1111         }
1112
1113         /**
1114          * Get the prefixed title with spaces.
1115          * This is the form usually used for display
1116          *
1117          * @return String the prefixed title, with spaces
1118          */
1119         public function getPrefixedText() {
1120                 // @todo FIXME: Bad usage of empty() ?
1121                 if ( empty( $this->mPrefixedText ) ) {
1122                         $s = $this->prefix( $this->mTextform );
1123                         $s = str_replace( '_', ' ', $s );
1124                         $this->mPrefixedText = $s;
1125                 }
1126                 return $this->mPrefixedText;
1127         }
1128
1129         /**
1130          * Return a string representation of this title
1131          *
1132          * @return String representation of this title
1133          */
1134         public function __toString() {
1135                 return $this->getPrefixedText();
1136         }
1137
1138         /**
1139          * Get the prefixed title with spaces, plus any fragment
1140          * (part beginning with '#')
1141          *
1142          * @return String the prefixed title, with spaces and the fragment, including '#'
1143          */
1144         public function getFullText() {
1145                 $text = $this->getPrefixedText();
1146                 if ( $this->mFragment != '' ) {
1147                         $text .= '#' . $this->mFragment;
1148                 }
1149                 return $text;
1150         }
1151
1152         /**
1153          * Get the base page name, i.e. the leftmost part before any slashes
1154          *
1155          * @return String Base name
1156          */
1157         public function getBaseText() {
1158                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1159                         return $this->getText();
1160                 }
1161
1162                 $parts = explode( '/', $this->getText() );
1163                 # Don't discard the real title if there's no subpage involved
1164                 if ( count( $parts ) > 1 ) {
1165                         unset( $parts[count( $parts ) - 1] );
1166                 }
1167                 return implode( '/', $parts );
1168         }
1169
1170         /**
1171          * Get the lowest-level subpage name, i.e. the rightmost part after any slashes
1172          *
1173          * @return String Subpage name
1174          */
1175         public function getSubpageText() {
1176                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
1177                         return( $this->mTextform );
1178                 }
1179                 $parts = explode( '/', $this->mTextform );
1180                 return( $parts[count( $parts ) - 1] );
1181         }
1182
1183         /**
1184          * Get the HTML-escaped displayable text form.
1185          * Used for the title field in <a> tags.
1186          *
1187          * @return String the text, including any prefixes
1188          */
1189         public function getEscapedText() {
1190                 wfDeprecated( __METHOD__, '1.19' );
1191                 return htmlspecialchars( $this->getPrefixedText() );
1192         }
1193
1194         /**
1195          * Get a URL-encoded form of the subpage text
1196          *
1197          * @return String URL-encoded subpage name
1198          */
1199         public function getSubpageUrlForm() {
1200                 $text = $this->getSubpageText();
1201                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
1202                 return( $text );
1203         }
1204
1205         /**
1206          * Get a URL-encoded title (not an actual URL) including interwiki
1207          *
1208          * @return String the URL-encoded form
1209          */
1210         public function getPrefixedURL() {
1211                 $s = $this->prefix( $this->mDbkeyform );
1212                 $s = wfUrlencode( str_replace( ' ', '_', $s ) );
1213                 return $s;
1214         }
1215
1216         /**
1217          * Helper to fix up the get{Local,Full,Link,Canonical}URL args
1218          * get{Canonical,Full,Link,Local}URL methods accepted an optional
1219          * second argument named variant. This was deprecated in favor
1220          * of passing an array of option with a "variant" key
1221          * Once $query2 is removed for good, this helper can be dropped
1222          * andthe wfArrayToCGI moved to getLocalURL();
1223          *
1224          * @since 1.19 (r105919)
1225          * @param $query
1226          * @param $query2 bool
1227          * @return String
1228          */
1229         private static function fixUrlQueryArgs( $query, $query2 = false ) {
1230                 if( $query2 !== false ) {
1231                         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" );
1232                 }
1233                 if ( is_array( $query ) ) {
1234                         $query = wfArrayToCGI( $query );
1235                 }
1236                 if ( $query2 ) {
1237                         if ( is_string( $query2 ) ) {
1238                                 // $query2 is a string, we will consider this to be
1239                                 // a deprecated $variant argument and add it to the query
1240                                 $query2 = wfArrayToCGI( array( 'variant' => $query2 ) );
1241                         } else {
1242                                 $query2 = wfArrayToCGI( $query2 );
1243                         }
1244                         // If we have $query content add a & to it first
1245                         if ( $query ) {
1246                                 $query .= '&';
1247                         }
1248                         // Now append the queries together
1249                         $query .= $query2;
1250                 }
1251                 return $query;
1252         }
1253
1254         /**
1255          * Get a real URL referring to this title, with interwiki link and
1256          * fragment
1257          *
1258          * See getLocalURL for the arguments.
1259          *
1260          * @see self::getLocalURL
1261          * @return String the URL
1262          */
1263         public function getFullURL( $query = '', $query2 = false ) {
1264                 $query = self::fixUrlQueryArgs( $query, $query2 );
1265
1266                 # Hand off all the decisions on urls to getLocalURL
1267                 $url = $this->getLocalURL( $query );
1268
1269                 # Expand the url to make it a full url. Note that getLocalURL has the
1270                 # potential to output full urls for a variety of reasons, so we use
1271                 # wfExpandUrl instead of simply prepending $wgServer
1272                 $url = wfExpandUrl( $url, PROTO_RELATIVE );
1273
1274                 # Finally, add the fragment.
1275                 $url .= $this->getFragmentForURL();
1276
1277                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
1278                 return $url;
1279         }
1280
1281         /**
1282          * Get a URL with no fragment or server name.  If this page is generated
1283          * with action=render, $wgServer is prepended.
1284          *
1285
1286          * @param $query string|array an optional query string,
1287          *   not used for interwiki     links. Can be specified as an associative array as well,
1288          *   e.g., array( 'action' => 'edit' ) (keys and values will be URL-escaped).
1289          *   Some query patterns will trigger various shorturl path replacements.
1290          * @param $query2 Mixed: An optional secondary query array. This one MUST
1291          *   be an array. If a string is passed it will be interpreted as a deprecated
1292          *   variant argument and urlencoded into a variant= argument.
1293          *   This second query argument will be added to the $query
1294          *   The second parameter is deprecated since 1.19. Pass it as a key,value
1295          *   pair in the first parameter array instead.
1296          *
1297          * @return String the URL
1298          */
1299         public function getLocalURL( $query = '', $query2 = false ) {
1300                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
1301
1302                 $query = self::fixUrlQueryArgs( $query, $query2 );
1303
1304                 $interwiki = Interwiki::fetch( $this->mInterwiki );
1305                 if ( $interwiki ) {
1306                         $namespace = $this->getNsText();
1307                         if ( $namespace != '' ) {
1308                                 # Can this actually happen? Interwikis shouldn't be parsed.
1309                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
1310                                 $namespace .= ':';
1311                         }
1312                         $url = $interwiki->getURL( $namespace . $this->getDBkey() );
1313                         $url = wfAppendQuery( $url, $query );
1314                 } else {
1315                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
1316                         if ( $query == '' ) {
1317                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
1318                                 wfRunHooks( 'GetLocalURL::Article', array( &$this, &$url ) );
1319                         } else {
1320                                 global $wgVariantArticlePath, $wgActionPaths;
1321                                 $url = false;
1322                                 $matches = array();
1323
1324                                 if ( !empty( $wgActionPaths ) &&
1325                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
1326                                 {
1327                                         $action = urldecode( $matches[2] );
1328                                         if ( isset( $wgActionPaths[$action] ) ) {
1329                                                 $query = $matches[1];
1330                                                 if ( isset( $matches[4] ) ) {
1331                                                         $query .= $matches[4];
1332                                                 }
1333                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
1334                                                 if ( $query != '' ) {
1335                                                         $url = wfAppendQuery( $url, $query );
1336                                                 }
1337                                         }
1338                                 }
1339
1340                                 if ( $url === false &&
1341                                         $wgVariantArticlePath &&
1342                                         $this->getPageLanguage()->hasVariants() &&
1343                                         preg_match( '/^variant=([^&]*)$/', $query, $matches ) )
1344                                 {
1345                                         $variant = urldecode( $matches[1] );
1346                                         if ( $this->getPageLanguage()->hasVariant( $variant ) ) {
1347                                                 // Only do the variant replacement if the given variant is a valid
1348                                                 // variant for the page's language.
1349                                                 $url = str_replace( '$2', urlencode( $variant ), $wgVariantArticlePath );
1350                                                 $url = str_replace( '$1', $dbkey, $url );
1351                                         }
1352                                 }
1353
1354                                 if ( $url === false ) {
1355                                         if ( $query == '-' ) {
1356                                                 $query = '';
1357                                         }
1358                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
1359                                 }
1360                         }
1361
1362                         wfRunHooks( 'GetLocalURL::Internal', array( &$this, &$url, $query ) );
1363
1364                         // @todo FIXME: This causes breakage in various places when we
1365                         // actually expected a local URL and end up with dupe prefixes.
1366                         if ( $wgRequest->getVal( 'action' ) == 'render' ) {
1367                                 $url = $wgServer . $url;
1368                         }
1369                 }
1370                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
1371                 return $url;
1372         }
1373
1374         /**
1375          * Get a URL that's the simplest URL that will be valid to link, locally,
1376          * to the current Title.  It includes the fragment, but does not include
1377          * the server unless action=render is used (or the link is external).  If
1378          * there's a fragment but the prefixed text is empty, we just return a link
1379          * to the fragment.
1380          *
1381          * The result obviously should not be URL-escaped, but does need to be
1382          * HTML-escaped if it's being output in HTML.
1383          *
1384          * See getLocalURL for the arguments.
1385          *
1386          * @see self::getLocalURL
1387          * @return String the URL
1388          */
1389         public function getLinkURL( $query = '', $query2 = false ) {
1390                 wfProfileIn( __METHOD__ );
1391                 if ( $this->isExternal() ) {
1392                         $ret = $this->getFullURL( $query, $query2 );
1393                 } elseif ( $this->getPrefixedText() === '' && $this->getFragment() !== '' ) {
1394                         $ret = $this->getFragmentForURL();
1395                 } else {
1396                         $ret = $this->getLocalURL( $query, $query2 ) . $this->getFragmentForURL();
1397                 }
1398                 wfProfileOut( __METHOD__ );
1399                 return $ret;
1400         }
1401
1402         /**
1403          * Get an HTML-escaped version of the URL form, suitable for
1404          * using in a link, without a server name or fragment
1405          *
1406          * See getLocalURL for the arguments.
1407          *
1408          * @see self::getLocalURL
1409          * @param $query string
1410          * @param $query2 bool|string
1411          * @return String the URL
1412          */
1413         public function escapeLocalURL( $query = '', $query2 = false ) {
1414                 wfDeprecated( __METHOD__, '1.19' );
1415                 return htmlspecialchars( $this->getLocalURL( $query, $query2 ) );
1416         }
1417
1418         /**
1419          * Get an HTML-escaped version of the URL form, suitable for
1420          * using in a link, including the server name and fragment
1421          *
1422          * See getLocalURL for the arguments.
1423          *
1424          * @see self::getLocalURL
1425          * @return String the URL
1426          */
1427         public function escapeFullURL( $query = '', $query2 = false ) {
1428                 wfDeprecated( __METHOD__, '1.19' );
1429                 return htmlspecialchars( $this->getFullURL( $query, $query2 ) );
1430         }
1431
1432         /**
1433          * Get the URL form for an internal link.
1434          * - Used in various Squid-related code, in case we have a different
1435          * internal hostname for the server from the exposed one.
1436          *
1437          * This uses $wgInternalServer to qualify the path, or $wgServer
1438          * if $wgInternalServer is not set. If the server variable used is
1439          * protocol-relative, the URL will be expanded to http://
1440          *
1441          * See getLocalURL for the arguments.
1442          *
1443          * @see self::getLocalURL
1444          * @return String the URL
1445          */
1446         public function getInternalURL( $query = '', $query2 = false ) {
1447                 global $wgInternalServer, $wgServer;
1448                 $query = self::fixUrlQueryArgs( $query, $query2 );
1449                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
1450                 $url = wfExpandUrl( $server . $this->getLocalURL( $query ), PROTO_HTTP );
1451                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
1452                 return $url;
1453         }
1454
1455         /**
1456          * Get the URL for a canonical link, for use in things like IRC and
1457          * e-mail notifications. Uses $wgCanonicalServer and the
1458          * GetCanonicalURL hook.
1459          *
1460          * NOTE: Unlike getInternalURL(), the canonical URL includes the fragment
1461          *
1462          * See getLocalURL for the arguments.
1463          *
1464          * @see self::getLocalURL
1465          * @return string The URL
1466          * @since 1.18
1467          */
1468         public function getCanonicalURL( $query = '', $query2 = false ) {
1469                 $query = self::fixUrlQueryArgs( $query, $query2 );
1470                 $url = wfExpandUrl( $this->getLocalURL( $query ) . $this->getFragmentForURL(), PROTO_CANONICAL );
1471                 wfRunHooks( 'GetCanonicalURL', array( &$this, &$url, $query ) );
1472                 return $url;
1473         }
1474
1475         /**
1476          * HTML-escaped version of getCanonicalURL()
1477          *
1478          * See getLocalURL for the arguments.
1479          *
1480          * @see self::getLocalURL
1481          * @since 1.18
1482          * @return string
1483          */
1484         public function escapeCanonicalURL( $query = '', $query2 = false ) {
1485                 wfDeprecated( __METHOD__, '1.19' );
1486                 return htmlspecialchars( $this->getCanonicalURL( $query, $query2 ) );
1487         }
1488
1489         /**
1490          * Get the edit URL for this Title
1491          *
1492          * @return String the URL, or a null string if this is an
1493          *  interwiki link
1494          */
1495         public function getEditURL() {
1496                 if ( $this->mInterwiki != '' ) {
1497                         return '';
1498                 }
1499                 $s = $this->getLocalURL( 'action=edit' );
1500
1501                 return $s;
1502         }
1503
1504         /**
1505          * Is $wgUser watching this page?
1506          *
1507          * @return Bool
1508          */
1509         public function userIsWatching() {
1510                 global $wgUser;
1511
1512                 if ( is_null( $this->mWatched ) ) {
1513                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn() ) {
1514                                 $this->mWatched = false;
1515                         } else {
1516                                 $this->mWatched = $wgUser->isWatched( $this );
1517                         }
1518                 }
1519                 return $this->mWatched;
1520         }
1521
1522         /**
1523          * Can $wgUser read this page?
1524          *
1525          * @deprecated in 1.19; use userCan(), quickUserCan() or getUserPermissionsErrors() instead
1526          * @return Bool
1527          * @todo fold these checks into userCan()
1528          */
1529         public function userCanRead() {
1530                 wfDeprecated( __METHOD__, '1.19' );
1531                 return $this->userCan( 'read' );
1532         }
1533
1534         /**
1535          * Can $user perform $action on this page?
1536          * This skips potentially expensive cascading permission checks
1537          * as well as avoids expensive error formatting
1538          *
1539          * Suitable for use for nonessential UI controls in common cases, but
1540          * _not_ for functional access control.
1541          *
1542          * May provide false positives, but should never provide a false negative.
1543          *
1544          * @param $action String action that permission needs to be checked for
1545          * @param $user User to check (since 1.19); $wgUser will be used if not
1546          *              provided.
1547          * @return Bool
1548          */
1549         public function quickUserCan( $action, $user = null ) {
1550                 return $this->userCan( $action, $user, false );
1551         }
1552
1553         /**
1554          * Can $user perform $action on this page?
1555          *
1556          * @param $action String action that permission needs to be checked for
1557          * @param $user User to check (since 1.19); $wgUser will be used if not
1558          *   provided.
1559          * @param $doExpensiveQueries Bool Set this to false to avoid doing
1560          *   unnecessary queries.
1561          * @return Bool
1562          */
1563         public function userCan( $action, $user = null, $doExpensiveQueries = true ) {
1564                 if ( !$user instanceof User ) {
1565                         global $wgUser;
1566                         $user = $wgUser;
1567                 }
1568                 return !count( $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries, true ) );
1569         }
1570
1571         /**
1572          * Can $user perform $action on this page?
1573          *
1574          * @todo FIXME: This *does not* check throttles (User::pingLimiter()).
1575          *
1576          * @param $action String action that permission needs to be checked for
1577          * @param $user User to check
1578          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary
1579          *   queries by skipping checks for cascading protections and user blocks.
1580          * @param $ignoreErrors Array of Strings Set this to a list of message keys
1581          *   whose corresponding errors may be ignored.
1582          * @return Array of arguments to wfMsg to explain permissions problems.
1583          */
1584         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true, $ignoreErrors = array() ) {
1585                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1586
1587                 // Remove the errors being ignored.
1588                 foreach ( $errors as $index => $error ) {
1589                         $error_key = is_array( $error ) ? $error[0] : $error;
1590
1591                         if ( in_array( $error_key, $ignoreErrors ) ) {
1592                                 unset( $errors[$index] );
1593                         }
1594                 }
1595
1596                 return $errors;
1597         }
1598
1599         /**
1600          * Permissions checks that fail most often, and which are easiest to test.
1601          *
1602          * @param $action String the action to check
1603          * @param $user User user to check
1604          * @param $errors Array list of current errors
1605          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1606          * @param $short Boolean short circuit on first error
1607          *
1608          * @return Array list of errors
1609          */
1610         private function checkQuickPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1611                 if ( $action == 'create' ) {
1612                         if ( ( $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1613                                  ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1614                                 $errors[] = $user->isAnon() ? array( 'nocreatetext' ) : array( 'nocreate-loggedin' );
1615                         }
1616                 } elseif ( $action == 'move' ) {
1617                         if ( !$user->isAllowed( 'move-rootuserpages' )
1618                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1619                                 // Show user page-specific message only if the user can move other pages
1620                                 $errors[] = array( 'cant-move-user-page' );
1621                         }
1622
1623                         // Check if user is allowed to move files if it's a file
1624                         if ( $this->mNamespace == NS_FILE && !$user->isAllowed( 'movefile' ) ) {
1625                                 $errors[] = array( 'movenotallowedfile' );
1626                         }
1627
1628                         if ( !$user->isAllowed( 'move' ) ) {
1629                                 // User can't move anything
1630                                 global $wgGroupPermissions;
1631                                 $userCanMove = false;
1632                                 if ( isset( $wgGroupPermissions['user']['move'] ) ) {
1633                                         $userCanMove = $wgGroupPermissions['user']['move'];
1634                                 }
1635                                 $autoconfirmedCanMove = false;
1636                                 if ( isset( $wgGroupPermissions['autoconfirmed']['move'] ) ) {
1637                                         $autoconfirmedCanMove = $wgGroupPermissions['autoconfirmed']['move'];
1638                                 }
1639                                 if ( $user->isAnon() && ( $userCanMove || $autoconfirmedCanMove ) ) {
1640                                         // custom message if logged-in users without any special rights can move
1641                                         $errors[] = array( 'movenologintext' );
1642                                 } else {
1643                                         $errors[] = array( 'movenotallowed' );
1644                                 }
1645                         }
1646                 } elseif ( $action == 'move-target' ) {
1647                         if ( !$user->isAllowed( 'move' ) ) {
1648                                 // User can't move anything
1649                                 $errors[] = array( 'movenotallowed' );
1650                         } elseif ( !$user->isAllowed( 'move-rootuserpages' )
1651                                         && $this->mNamespace == NS_USER && !$this->isSubpage() ) {
1652                                 // Show user page-specific message only if the user can move other pages
1653                                 $errors[] = array( 'cant-move-to-user-page' );
1654                         }
1655                 } elseif ( !$user->isAllowed( $action ) ) {
1656                         $errors[] = $this->missingPermissionError( $action, $short );
1657                 }
1658
1659                 return $errors;
1660         }
1661
1662         /**
1663          * Add the resulting error code to the errors array
1664          *
1665          * @param $errors Array list of current errors
1666          * @param $result Mixed result of errors
1667          *
1668          * @return Array list of errors
1669          */
1670         private function resultToError( $errors, $result ) {
1671                 if ( is_array( $result ) && count( $result ) && !is_array( $result[0] ) ) {
1672                         // A single array representing an error
1673                         $errors[] = $result;
1674                 } elseif ( is_array( $result ) && is_array( $result[0] ) ) {
1675                         // A nested array representing multiple errors
1676                         $errors = array_merge( $errors, $result );
1677                 } elseif ( $result !== '' && is_string( $result ) ) {
1678                         // A string representing a message-id
1679                         $errors[] = array( $result );
1680                 } elseif ( $result === false ) {
1681                         // a generic "We don't want them to do that"
1682                         $errors[] = array( 'badaccess-group0' );
1683                 }
1684                 return $errors;
1685         }
1686
1687         /**
1688          * Check various permission hooks
1689          *
1690          * @param $action String the action to check
1691          * @param $user User user to check
1692          * @param $errors Array list of current errors
1693          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1694          * @param $short Boolean short circuit on first error
1695          *
1696          * @return Array list of errors
1697          */
1698         private function checkPermissionHooks( $action, $user, $errors, $doExpensiveQueries, $short ) {
1699                 // Use getUserPermissionsErrors instead
1700                 $result = '';
1701                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1702                         return $result ? array() : array( array( 'badaccess-group0' ) );
1703                 }
1704                 // Check getUserPermissionsErrors hook
1705                 if ( !wfRunHooks( 'getUserPermissionsErrors', array( &$this, &$user, $action, &$result ) ) ) {
1706                         $errors = $this->resultToError( $errors, $result );
1707                 }
1708                 // Check getUserPermissionsErrorsExpensive hook
1709                 if ( $doExpensiveQueries && !( $short && count( $errors ) > 0 ) &&
1710                          !wfRunHooks( 'getUserPermissionsErrorsExpensive', array( &$this, &$user, $action, &$result ) ) ) {
1711                         $errors = $this->resultToError( $errors, $result );
1712                 }
1713
1714                 return $errors;
1715         }
1716
1717         /**
1718          * Check permissions on special pages & namespaces
1719          *
1720          * @param $action String the action to check
1721          * @param $user User user to check
1722          * @param $errors Array list of current errors
1723          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1724          * @param $short Boolean short circuit on first error
1725          *
1726          * @return Array list of errors
1727          */
1728         private function checkSpecialsAndNSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1729                 # Only 'createaccount' and 'execute' can be performed on
1730                 # special pages, which don't actually exist in the DB.
1731                 $specialOKActions = array( 'createaccount', 'execute', 'read' );
1732                 if ( NS_SPECIAL == $this->mNamespace && !in_array( $action, $specialOKActions ) ) {
1733                         $errors[] = array( 'ns-specialprotected' );
1734                 }
1735
1736                 # Check $wgNamespaceProtection for restricted namespaces
1737                 if ( $this->isNamespaceProtected( $user ) ) {
1738                         $ns = $this->mNamespace == NS_MAIN ?
1739                                 wfMsg( 'nstab-main' ) : $this->getNsText();
1740                         $errors[] = $this->mNamespace == NS_MEDIAWIKI ?
1741                                 array( 'protectedinterface' ) : array( 'namespaceprotected',  $ns );
1742                 }
1743
1744                 return $errors;
1745         }
1746
1747         /**
1748          * Check CSS/JS sub-page permissions
1749          *
1750          * @param $action String the action to check
1751          * @param $user User user to check
1752          * @param $errors Array list of current errors
1753          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1754          * @param $short Boolean short circuit on first error
1755          *
1756          * @return Array list of errors
1757          */
1758         private function checkCSSandJSPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1759                 # Protect css/js subpages of user pages
1760                 # XXX: this might be better using restrictions
1761                 # XXX: right 'editusercssjs' is deprecated, for backward compatibility only
1762                 if ( $action != 'patrol' && !$user->isAllowed( 'editusercssjs' )
1763                                 && !preg_match( '/^' . preg_quote( $user->getName(), '/' ) . '\//', $this->mTextform ) ) {
1764                         if ( $this->isCssSubpage() && !$user->isAllowed( 'editusercss' ) ) {
1765                                 $errors[] = array( 'customcssprotected' );
1766                         } elseif ( $this->isJsSubpage() && !$user->isAllowed( 'edituserjs' ) ) {
1767                                 $errors[] = array( 'customjsprotected' );
1768                         }
1769                 }
1770
1771                 return $errors;
1772         }
1773
1774         /**
1775          * Check against page_restrictions table requirements on this
1776          * page. The user must possess all required rights for this
1777          * action.
1778          *
1779          * @param $action String the action to check
1780          * @param $user User user to check
1781          * @param $errors Array list of current errors
1782          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1783          * @param $short Boolean short circuit on first error
1784          *
1785          * @return Array list of errors
1786          */
1787         private function checkPageRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1788                 foreach ( $this->getRestrictions( $action ) as $right ) {
1789                         // Backwards compatibility, rewrite sysop -> protect
1790                         if ( $right == 'sysop' ) {
1791                                 $right = 'protect';
1792                         }
1793                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1794                                 // Users with 'editprotected' permission can edit protected pages
1795                                 // without cascading option turned on.
1796                                 if ( $action != 'edit' || !$user->isAllowed( 'editprotected' )
1797                                         || $this->mCascadeRestriction )
1798                                 {
1799                                         $errors[] = array( 'protectedpagetext', $right );
1800                                 }
1801                         }
1802                 }
1803
1804                 return $errors;
1805         }
1806
1807         /**
1808          * Check restrictions on cascading pages.
1809          *
1810          * @param $action String the action to check
1811          * @param $user User to check
1812          * @param $errors Array list of current errors
1813          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1814          * @param $short Boolean short circuit on first error
1815          *
1816          * @return Array list of errors
1817          */
1818         private function checkCascadingSourcesRestrictions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1819                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1820                         # We /could/ use the protection level on the source page, but it's
1821                         # fairly ugly as we have to establish a precedence hierarchy for pages
1822                         # included by multiple cascade-protected pages. So just restrict
1823                         # it to people with 'protect' permission, as they could remove the
1824                         # protection anyway.
1825                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1826                         # Cascading protection depends on more than this page...
1827                         # Several cascading protected pages may include this page...
1828                         # Check each cascading level
1829                         # This is only for protection restrictions, not for all actions
1830                         if ( isset( $restrictions[$action] ) ) {
1831                                 foreach ( $restrictions[$action] as $right ) {
1832                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1833                                         if ( $right != '' && !$user->isAllowed( $right ) ) {
1834                                                 $pages = '';
1835                                                 foreach ( $cascadingSources as $page )
1836                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1837                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1838                                         }
1839                                 }
1840                         }
1841                 }
1842
1843                 return $errors;
1844         }
1845
1846         /**
1847          * Check action permissions not already checked in checkQuickPermissions
1848          *
1849          * @param $action String the action to check
1850          * @param $user User to check
1851          * @param $errors Array list of current errors
1852          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1853          * @param $short Boolean short circuit on first error
1854          *
1855          * @return Array list of errors
1856          */
1857         private function checkActionPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1858                 global $wgDeleteRevisionsLimit, $wgLang;
1859
1860                 if ( $action == 'protect' ) {
1861                         if ( count( $this->getUserPermissionsErrorsInternal( 'edit', $user, $doExpensiveQueries, true ) ) ) {
1862                                 // If they can't edit, they shouldn't protect.
1863                                 $errors[] = array( 'protect-cantedit' );
1864                         }
1865                 } elseif ( $action == 'create' ) {
1866                         $title_protection = $this->getTitleProtection();
1867                         if( $title_protection ) {
1868                                 if( $title_protection['pt_create_perm'] == 'sysop' ) {
1869                                         $title_protection['pt_create_perm'] = 'protect'; // B/C
1870                                 }
1871                                 if( $title_protection['pt_create_perm'] == '' ||
1872                                         !$user->isAllowed( $title_protection['pt_create_perm'] ) )
1873                                 {
1874                                         $errors[] = array( 'titleprotected', User::whoIs( $title_protection['pt_user'] ), $title_protection['pt_reason'] );
1875                                 }
1876                         }
1877                 } elseif ( $action == 'move' ) {
1878                         // Check for immobile pages
1879                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1880                                 // Specific message for this case
1881                                 $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
1882                         } elseif ( !$this->isMovable() ) {
1883                                 // Less specific message for rarer cases
1884                                 $errors[] = array( 'immobile-source-page' );
1885                         }
1886                 } elseif ( $action == 'move-target' ) {
1887                         if ( !MWNamespace::isMovable( $this->mNamespace ) ) {
1888                                 $errors[] = array( 'immobile-target-namespace', $this->getNsText() );
1889                         } elseif ( !$this->isMovable() ) {
1890                                 $errors[] = array( 'immobile-target-page' );
1891                         }
1892                 } elseif ( $action == 'delete' ) {
1893                         if ( $doExpensiveQueries && $wgDeleteRevisionsLimit
1894                                 && !$this->userCan( 'bigdelete', $user ) && $this->isBigDeletion() )
1895                         {
1896                                 $errors[] = array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) );
1897                         }
1898                 }
1899                 return $errors;
1900         }
1901
1902         /**
1903          * Check that the user isn't blocked from editting.
1904          *
1905          * @param $action String the action to check
1906          * @param $user User to check
1907          * @param $errors Array list of current errors
1908          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1909          * @param $short Boolean short circuit on first error
1910          *
1911          * @return Array list of errors
1912          */
1913         private function checkUserBlock( $action, $user, $errors, $doExpensiveQueries, $short ) {
1914                 // Account creation blocks handled at userlogin.
1915                 // Unblocking handled in SpecialUnblock
1916                 if( !$doExpensiveQueries || in_array( $action, array( 'createaccount', 'unblock' ) ) ) {
1917                         return $errors;
1918                 }
1919
1920                 global $wgContLang, $wgLang, $wgEmailConfirmToEdit;
1921
1922                 if ( $wgEmailConfirmToEdit && !$user->isEmailConfirmed() ) {
1923                         $errors[] = array( 'confirmedittext' );
1924                 }
1925
1926                 if ( ( $action == 'edit' || $action == 'create' ) && !$user->isBlockedFrom( $this ) ) {
1927                         // Don't block the user from editing their own talk page unless they've been
1928                         // explicitly blocked from that too.
1929                 } elseif( $user->isBlocked() && $user->mBlock->prevents( $action ) !== false ) {
1930                         $block = $user->getBlock();
1931
1932                         // This is from OutputPage::blockedPage
1933                         // Copied at r23888 by werdna
1934
1935                         $id = $user->blockedBy();
1936                         $reason = $user->blockedFor();
1937                         if ( $reason == '' ) {
1938                                 $reason = wfMsg( 'blockednoreason' );
1939                         }
1940                         $ip = $user->getRequest()->getIP();
1941
1942                         if ( is_numeric( $id ) ) {
1943                                 $name = User::whoIs( $id );
1944                         } else {
1945                                 $name = $id;
1946                         }
1947
1948                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1949                         $blockid = $block->getId();
1950                         $blockExpiry = $block->getExpiry();
1951                         $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $block->mTimestamp ), true );
1952                         if ( $blockExpiry == 'infinity' ) {
1953                                 $blockExpiry = wfMessage( 'infiniteblock' )->text();
1954                         } else {
1955                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1956                         }
1957
1958                         $intended = strval( $block->getTarget() );
1959
1960                         $errors[] = array( ( $block->mAuto ? 'autoblockedtext' : 'blockedtext' ), $link, $reason, $ip, $name,
1961                                 $blockid, $blockExpiry, $intended, $blockTimestamp );
1962                 }
1963
1964                 return $errors;
1965         }
1966
1967         /**
1968          * Check that the user is allowed to read this page.
1969          *
1970          * @param $action String the action to check
1971          * @param $user User to check
1972          * @param $errors Array list of current errors
1973          * @param $doExpensiveQueries Boolean whether or not to perform expensive queries
1974          * @param $short Boolean short circuit on first error
1975          *
1976          * @return Array list of errors
1977          */
1978         private function checkReadPermissions( $action, $user, $errors, $doExpensiveQueries, $short ) {
1979                 global $wgWhitelistRead, $wgGroupPermissions, $wgRevokePermissions;
1980                 static $useShortcut = null;
1981
1982                 # Initialize the $useShortcut boolean, to determine if we can skip quite a bit of code below
1983                 if ( is_null( $useShortcut ) ) {
1984                         $useShortcut = true;
1985                         if ( empty( $wgGroupPermissions['*']['read'] ) ) {
1986                                 # Not a public wiki, so no shortcut
1987                                 $useShortcut = false;
1988                         } elseif ( !empty( $wgRevokePermissions ) ) {
1989                                 /**
1990                                  * Iterate through each group with permissions being revoked (key not included since we don't care
1991                                  * what the group name is), then check if the read permission is being revoked. If it is, then
1992                                  * we don't use the shortcut below since the user might not be able to read, even though anon
1993                                  * reading is allowed.
1994                                  */
1995                                 foreach ( $wgRevokePermissions as $perms ) {
1996                                         if ( !empty( $perms['read'] ) ) {
1997                                                 # We might be removing the read right from the user, so no shortcut
1998                                                 $useShortcut = false;
1999                                                 break;
2000                                         }
2001                                 }
2002                         }
2003                 }
2004
2005                 $whitelisted = false;
2006                 if ( $useShortcut ) {
2007                         # Shortcut for public wikis, allows skipping quite a bit of code
2008                         $whitelisted = true;
2009                 } elseif ( $user->isAllowed( 'read' ) ) {
2010                         # If the user is allowed to read pages, he is allowed to read all pages
2011                         $whitelisted = true;
2012                 } elseif ( $this->isSpecial( 'Userlogin' )
2013                         || $this->isSpecial( 'ChangePassword' )
2014                         || $this->isSpecial( 'PasswordReset' )
2015                 ) {
2016                         # Always grant access to the login page.
2017                         # Even anons need to be able to log in.
2018                         $whitelisted = true;
2019                 } elseif ( is_array( $wgWhitelistRead ) && count( $wgWhitelistRead ) ) {
2020                         # Time to check the whitelist
2021                         # Only do these checks is there's something to check against
2022                         $name = $this->getPrefixedText();
2023                         $dbName = $this->getPrefixedDBKey();
2024
2025                         // Check for explicit whitelisting with and without underscores
2026                         if ( in_array( $name, $wgWhitelistRead, true ) || in_array( $dbName, $wgWhitelistRead, true ) ) {
2027                                 $whitelisted = true;
2028                         } elseif ( $this->getNamespace() == NS_MAIN ) {
2029                                 # Old settings might have the title prefixed with
2030                                 # a colon for main-namespace pages
2031                                 if ( in_array( ':' . $name, $wgWhitelistRead ) ) {
2032                                         $whitelisted = true;
2033                                 }
2034                         } elseif ( $this->isSpecialPage() ) {
2035                                 # If it's a special page, ditch the subpage bit and check again
2036                                 $name = $this->getDBkey();
2037                                 list( $name, /* $subpage */ ) = SpecialPageFactory::resolveAlias( $name );
2038                                 if ( $name !== false ) {
2039                                         $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
2040                                         if ( in_array( $pure, $wgWhitelistRead, true ) ) {
2041                                                 $whitelisted = true;
2042                                         }
2043                                 }
2044                         }
2045                 }
2046
2047                 if ( !$whitelisted ) {
2048                         # If the title is not whitelisted, give extensions a chance to do so...
2049                         wfRunHooks( 'TitleReadWhitelist', array( $this, $user, &$whitelisted ) );
2050                         if ( !$whitelisted ) {
2051                                 $errors[] = $this->missingPermissionError( $action, $short );
2052                         }
2053                 }
2054
2055                 return $errors;
2056         }
2057
2058         /**
2059          * Get a description array when the user doesn't have the right to perform
2060          * $action (i.e. when User::isAllowed() returns false)
2061          *
2062          * @param $action String the action to check
2063          * @param $short Boolean short circuit on first error
2064          * @return Array list of errors
2065          */
2066         private function missingPermissionError( $action, $short ) {
2067                 // We avoid expensive display logic for quickUserCan's and such
2068                 if ( $short ) {
2069                         return array( 'badaccess-group0' );
2070                 }
2071
2072                 $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
2073                         User::getGroupsWithPermission( $action ) );
2074
2075                 if ( count( $groups ) ) {
2076                         global $wgLang;
2077                         return array(
2078                                 'badaccess-groups',
2079                                 $wgLang->commaList( $groups ),
2080                                 count( $groups )
2081                         );
2082                 } else {
2083                         return array( 'badaccess-group0' );
2084                 }
2085         }
2086
2087         /**
2088          * Can $user perform $action on this page? This is an internal function,
2089          * which checks ONLY that previously checked by userCan (i.e. it leaves out
2090          * checks on wfReadOnly() and blocks)
2091          *
2092          * @param $action String action that permission needs to be checked for
2093          * @param $user User to check
2094          * @param $doExpensiveQueries Bool Set this to false to avoid doing unnecessary queries.
2095          * @param $short Bool Set this to true to stop after the first permission error.
2096          * @return Array of arrays of the arguments to wfMsg to explain permissions problems.
2097          */
2098         protected function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true, $short = false ) {
2099                 wfProfileIn( __METHOD__ );
2100
2101                 # Read has special handling
2102                 if ( $action == 'read' ) {
2103                         $checks = array(
2104                                 'checkPermissionHooks',
2105                                 'checkReadPermissions',
2106                         );
2107                 } else {
2108                         $checks = array(
2109                                 'checkQuickPermissions',
2110                                 'checkPermissionHooks',
2111                                 'checkSpecialsAndNSPermissions',
2112                                 'checkCSSandJSPermissions',
2113                                 'checkPageRestrictions',
2114                                 'checkCascadingSourcesRestrictions',
2115                                 'checkActionPermissions',
2116                                 'checkUserBlock'
2117                         );
2118                 }
2119
2120                 $errors = array();
2121                 while( count( $checks ) > 0 &&
2122                                 !( $short && count( $errors ) > 0 ) ) {
2123                         $method = array_shift( $checks );
2124                         $errors = $this->$method( $action, $user, $errors, $doExpensiveQueries, $short );
2125                 }
2126
2127                 wfProfileOut( __METHOD__ );
2128                 return $errors;
2129         }
2130
2131         /**
2132          * Protect css subpages of user pages: can $wgUser edit
2133          * this page?
2134          *
2135          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2136          * @return Bool
2137          */
2138         public function userCanEditCssSubpage() {
2139                 global $wgUser;
2140                 wfDeprecated( __METHOD__, '1.19' );
2141                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'editusercss' ) )
2142                         || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2143         }
2144
2145         /**
2146          * Protect js subpages of user pages: can $wgUser edit
2147          * this page?
2148          *
2149          * @deprecated in 1.19; will be removed in 1.20. Use getUserPermissionsErrors() instead.
2150          * @return Bool
2151          */
2152         public function userCanEditJsSubpage() {
2153                 global $wgUser;
2154                 wfDeprecated( __METHOD__, '1.19' );
2155                 return ( ( $wgUser->isAllowedAll( 'editusercssjs', 'edituserjs' ) )
2156                            || preg_match( '/^' . preg_quote( $wgUser->getName(), '/' ) . '\//', $this->mTextform ) );
2157         }
2158
2159         /**
2160          * Get a filtered list of all restriction types supported by this wiki.
2161          * @param bool $exists True to get all restriction types that apply to
2162          * titles that do exist, False for all restriction types that apply to
2163          * titles that do not exist
2164          * @return array
2165          */
2166         public static function getFilteredRestrictionTypes( $exists = true ) {
2167                 global $wgRestrictionTypes;
2168                 $types = $wgRestrictionTypes;
2169                 if ( $exists ) {
2170                         # Remove the create restriction for existing titles
2171                         $types = array_diff( $types, array( 'create' ) );
2172                 } else {
2173                         # Only the create and upload restrictions apply to non-existing titles
2174                         $types = array_intersect( $types, array( 'create', 'upload' ) );
2175                 }
2176                 return $types;
2177         }
2178
2179         /**
2180          * Returns restriction types for the current Title
2181          *
2182          * @return array applicable restriction types
2183          */
2184         public function getRestrictionTypes() {
2185                 if ( $this->isSpecialPage() ) {
2186                         return array();
2187                 }
2188
2189                 $types = self::getFilteredRestrictionTypes( $this->exists() );
2190
2191                 if ( $this->getNamespace() != NS_FILE ) {
2192                         # Remove the upload restriction for non-file titles
2193                         $types = array_diff( $types, array( 'upload' ) );
2194                 }
2195
2196                 wfRunHooks( 'TitleGetRestrictionTypes', array( $this, &$types ) );
2197
2198                 wfDebug( __METHOD__ . ': applicable restrictions to [[' .
2199                         $this->getPrefixedText() . ']] are {' . implode( ',', $types ) . "}\n" );
2200
2201                 return $types;
2202         }
2203
2204         /**
2205          * Is this title subject to title protection?
2206          * Title protection is the one applied against creation of such title.
2207          *
2208          * @return Mixed An associative array representing any existent title
2209          *   protection, or false if there's none.
2210          */
2211         private function getTitleProtection() {
2212                 // Can't protect pages in special namespaces
2213                 if ( $this->getNamespace() < 0 ) {
2214                         return false;
2215                 }
2216
2217                 // Can't protect pages that exist.
2218                 if ( $this->exists() ) {
2219                         return false;
2220                 }
2221
2222                 if ( !isset( $this->mTitleProtection ) ) {
2223                         $dbr = wfGetDB( DB_SLAVE );
2224                         $res = $dbr->select( 'protected_titles', '*',
2225                                 array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2226                                 __METHOD__ );
2227
2228                         // fetchRow returns false if there are no rows.
2229                         $this->mTitleProtection = $dbr->fetchRow( $res );
2230                 }
2231                 return $this->mTitleProtection;
2232         }
2233
2234         /**
2235          * Update the title protection status
2236          *
2237          * @deprecated in 1.19; will be removed in 1.20. Use WikiPage::doUpdateRestrictions() instead.
2238          * @param $create_perm String Permission required for creation
2239          * @param $reason String Reason for protection
2240          * @param $expiry String Expiry timestamp
2241          * @return boolean true
2242          */
2243         public function updateTitleProtection( $create_perm, $reason, $expiry ) {
2244                 wfDeprecated( __METHOD__, '1.19' );
2245
2246                 global $wgUser;
2247
2248                 $limit = array( 'create' => $create_perm );
2249                 $expiry = array( 'create' => $expiry );
2250
2251                 $page = WikiPage::factory( $this );
2252                 $status = $page->doUpdateRestrictions( $limit, $expiry, false, $reason, $wgUser );
2253
2254                 return $status->isOK();
2255         }
2256
2257         /**
2258          * Remove any title protection due to page existing
2259          */
2260         public function deleteTitleProtection() {
2261                 $dbw = wfGetDB( DB_MASTER );
2262
2263                 $dbw->delete(
2264                         'protected_titles',
2265                         array( 'pt_namespace' => $this->getNamespace(), 'pt_title' => $this->getDBkey() ),
2266                         __METHOD__
2267                 );
2268                 $this->mTitleProtection = false;
2269         }
2270
2271         /**
2272          * Is this page "semi-protected" - the *only* protection is autoconfirm?
2273          *
2274          * @param $action String Action to check (default: edit)
2275          * @return Bool
2276          */
2277         public function isSemiProtected( $action = 'edit' ) {
2278                 if ( $this->exists() ) {
2279                         $restrictions = $this->getRestrictions( $action );
2280                         if ( count( $restrictions ) > 0 ) {
2281                                 foreach ( $restrictions as $restriction ) {
2282                                         if ( strtolower( $restriction ) != 'autoconfirmed' ) {
2283                                                 return false;
2284                                         }
2285                                 }
2286                         } else {
2287                                 # Not protected
2288                                 return false;
2289                         }
2290                         return true;
2291                 } else {
2292                         # If it doesn't exist, it can't be protected
2293                         return false;
2294                 }
2295         }
2296
2297         /**
2298          * Does the title correspond to a protected article?
2299          *
2300          * @param $action String the action the page is protected from,
2301          * by default checks all actions.
2302          * @return Bool
2303          */
2304         public function isProtected( $action = '' ) {
2305                 global $wgRestrictionLevels;
2306
2307                 $restrictionTypes = $this->getRestrictionTypes();
2308
2309                 # Special pages have inherent protection
2310                 if( $this->isSpecialPage() ) {
2311                         return true;
2312                 }
2313
2314                 # Check regular protection levels
2315                 foreach ( $restrictionTypes as $type ) {
2316                         if ( $action == $type || $action == '' ) {
2317                                 $r = $this->getRestrictions( $type );
2318                                 foreach ( $wgRestrictionLevels as $level ) {
2319                                         if ( in_array( $level, $r ) && $level != '' ) {
2320                                                 return true;
2321                                         }
2322                                 }
2323                         }
2324                 }
2325
2326                 return false;
2327         }
2328
2329         /**
2330          * Determines if $user is unable to edit this page because it has been protected
2331          * by $wgNamespaceProtection.
2332          *
2333          * @param $user User object to check permissions
2334          * @return Bool
2335          */
2336         public function isNamespaceProtected( User $user ) {
2337                 global $wgNamespaceProtection;
2338
2339                 if ( isset( $wgNamespaceProtection[$this->mNamespace] ) ) {
2340                         foreach ( (array)$wgNamespaceProtection[$this->mNamespace] as $right ) {
2341                                 if ( $right != '' && !$user->isAllowed( $right ) ) {
2342                                         return true;
2343                                 }
2344                         }
2345                 }
2346                 return false;
2347         }
2348
2349         /**
2350          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
2351          *
2352          * @return Bool If the page is subject to cascading restrictions.
2353          */
2354         public function isCascadeProtected() {
2355                 list( $sources, /* $restrictions */ ) = $this->getCascadeProtectionSources( false );
2356                 return ( $sources > 0 );
2357         }
2358
2359         /**
2360          * Cascading protection: Get the source of any cascading restrictions on this page.
2361          *
2362          * @param $getPages Bool Whether or not to retrieve the actual pages
2363          *        that the restrictions have come from.
2364          * @return Mixed Array of Title objects of the pages from which cascading restrictions
2365          *     have come, false for none, or true if such restrictions exist, but $getPages
2366          *     was not set.  The restriction array is an array of each type, each of which
2367          *     contains a array of unique groups.
2368          */
2369         public function getCascadeProtectionSources( $getPages = true ) {
2370                 global $wgContLang;
2371                 $pagerestrictions = array();
2372
2373                 if ( isset( $this->mCascadeSources ) && $getPages ) {
2374                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
2375                 } elseif ( isset( $this->mHasCascadingRestrictions ) && !$getPages ) {
2376                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
2377                 }
2378
2379                 wfProfileIn( __METHOD__ );
2380
2381                 $dbr = wfGetDB( DB_SLAVE );
2382
2383                 if ( $this->getNamespace() == NS_FILE ) {
2384                         $tables = array( 'imagelinks', 'page_restrictions' );
2385                         $where_clauses = array(
2386                                 'il_to' => $this->getDBkey(),
2387                                 'il_from=pr_page',
2388                                 'pr_cascade' => 1
2389                         );
2390                 } else {
2391                         $tables = array( 'templatelinks', 'page_restrictions' );
2392                         $where_clauses = array(
2393                                 'tl_namespace' => $this->getNamespace(),
2394                                 'tl_title' => $this->getDBkey(),
2395                                 'tl_from=pr_page',
2396                                 'pr_cascade' => 1
2397                         );
2398                 }
2399
2400                 if ( $getPages ) {
2401                         $cols = array( 'pr_page', 'page_namespace', 'page_title',
2402                                                    'pr_expiry', 'pr_type', 'pr_level' );
2403                         $where_clauses[] = 'page_id=pr_page';
2404                         $tables[] = 'page';
2405                 } else {
2406                         $cols = array( 'pr_expiry' );
2407                 }
2408
2409                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
2410
2411                 $sources = $getPages ? array() : false;
2412                 $now = wfTimestampNow();
2413                 $purgeExpired = false;
2414
2415                 foreach ( $res as $row ) {
2416                         $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2417                         if ( $expiry > $now ) {
2418                                 if ( $getPages ) {
2419                                         $page_id = $row->pr_page;
2420                                         $page_ns = $row->page_namespace;
2421                                         $page_title = $row->page_title;
2422                                         $sources[$page_id] = Title::makeTitle( $page_ns, $page_title );
2423                                         # Add groups needed for each restriction type if its not already there
2424                                         # Make sure this restriction type still exists
2425
2426                                         if ( !isset( $pagerestrictions[$row->pr_type] ) ) {
2427                                                 $pagerestrictions[$row->pr_type] = array();
2428                                         }
2429
2430                                         if ( isset( $pagerestrictions[$row->pr_type] ) &&
2431                                                  !in_array( $row->pr_level, $pagerestrictions[$row->pr_type] ) ) {
2432                                                 $pagerestrictions[$row->pr_type][] = $row->pr_level;
2433                                         }
2434                                 } else {
2435                                         $sources = true;
2436                                 }
2437                         } else {
2438                                 // Trigger lazy purge of expired restrictions from the db
2439                                 $purgeExpired = true;
2440                         }
2441                 }
2442                 if ( $purgeExpired ) {
2443                         Title::purgeExpiredRestrictions();
2444                 }
2445
2446                 if ( $getPages ) {
2447                         $this->mCascadeSources = $sources;
2448                         $this->mCascadingRestrictions = $pagerestrictions;
2449                 } else {
2450                         $this->mHasCascadingRestrictions = $sources;
2451                 }
2452
2453                 wfProfileOut( __METHOD__ );
2454                 return array( $sources, $pagerestrictions );
2455         }
2456
2457         /**
2458          * Accessor/initialisation for mRestrictions
2459          *
2460          * @param $action String action that permission needs to be checked for
2461          * @return Array of Strings the array of groups allowed to edit this article
2462          */
2463         public function getRestrictions( $action ) {
2464                 if ( !$this->mRestrictionsLoaded ) {
2465                         $this->loadRestrictions();
2466                 }
2467                 return isset( $this->mRestrictions[$action] )
2468                                 ? $this->mRestrictions[$action]
2469                                 : array();
2470         }
2471
2472         /**
2473          * Get the expiry time for the restriction against a given action
2474          *
2475          * @param $action
2476          * @return String|Bool 14-char timestamp, or 'infinity' if the page is protected forever
2477          *     or not protected at all, or false if the action is not recognised.
2478          */
2479         public function getRestrictionExpiry( $action ) {
2480                 if ( !$this->mRestrictionsLoaded ) {
2481                         $this->loadRestrictions();
2482                 }
2483                 return isset( $this->mRestrictionsExpiry[$action] ) ? $this->mRestrictionsExpiry[$action] : false;
2484         }
2485
2486         /**
2487          * Returns cascading restrictions for the current article
2488          *
2489          * @return Boolean
2490          */
2491         function areRestrictionsCascading() {
2492                 if ( !$this->mRestrictionsLoaded ) {
2493                         $this->loadRestrictions();
2494                 }
2495
2496                 return $this->mCascadeRestriction;
2497         }
2498
2499         /**
2500          * Loads a string into mRestrictions array
2501          *
2502          * @param $res Resource restrictions as an SQL result.
2503          * @param $oldFashionedRestrictions String comma-separated list of page
2504          *        restrictions from page table (pre 1.10)
2505          */
2506         private function loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions = null ) {
2507                 $rows = array();
2508
2509                 foreach ( $res as $row ) {
2510                         $rows[] = $row;
2511                 }
2512
2513                 $this->loadRestrictionsFromRows( $rows, $oldFashionedRestrictions );
2514         }
2515
2516         /**
2517          * Compiles list of active page restrictions from both page table (pre 1.10)
2518          * and page_restrictions table for this existing page.
2519          * Public for usage by LiquidThreads.
2520          *
2521          * @param $rows array of db result objects
2522          * @param $oldFashionedRestrictions string comma-separated list of page
2523          *        restrictions from page table (pre 1.10)
2524          */
2525         public function loadRestrictionsFromRows( $rows, $oldFashionedRestrictions = null ) {
2526                 global $wgContLang;
2527                 $dbr = wfGetDB( DB_SLAVE );
2528
2529                 $restrictionTypes = $this->getRestrictionTypes();
2530
2531                 foreach ( $restrictionTypes as $type ) {
2532                         $this->mRestrictions[$type] = array();
2533                         $this->mRestrictionsExpiry[$type] = $wgContLang->formatExpiry( '', TS_MW );
2534                 }
2535
2536                 $this->mCascadeRestriction = false;
2537
2538                 # Backwards-compatibility: also load the restrictions from the page record (old format).
2539
2540                 if ( $oldFashionedRestrictions === null ) {
2541                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions',
2542                                 array( 'page_id' => $this->getArticleID() ), __METHOD__ );
2543                 }
2544
2545                 if ( $oldFashionedRestrictions != '' ) {
2546
2547                         foreach ( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
2548                                 $temp = explode( '=', trim( $restrict ) );
2549                                 if ( count( $temp ) == 1 ) {
2550                                         // old old format should be treated as edit/move restriction
2551                                         $this->mRestrictions['edit'] = explode( ',', trim( $temp[0] ) );
2552                                         $this->mRestrictions['move'] = explode( ',', trim( $temp[0] ) );
2553                                 } else {
2554                                         $restriction = trim( $temp[1] );
2555                                         if( $restriction != '' ) { //some old entries are empty
2556                                                 $this->mRestrictions[$temp[0]] = explode( ',', $restriction );
2557                                         }
2558                                 }
2559                         }
2560
2561                         $this->mOldRestrictions = true;
2562
2563                 }
2564
2565                 if ( count( $rows ) ) {
2566                         # Current system - load second to make them override.
2567                         $now = wfTimestampNow();
2568                         $purgeExpired = false;
2569
2570                         # Cycle through all the restrictions.
2571                         foreach ( $rows as $row ) {
2572
2573                                 // Don't take care of restrictions types that aren't allowed
2574                                 if ( !in_array( $row->pr_type, $restrictionTypes ) )
2575                                         continue;
2576
2577                                 // This code should be refactored, now that it's being used more generally,
2578                                 // But I don't really see any harm in leaving it in Block for now -werdna
2579                                 $expiry = $wgContLang->formatExpiry( $row->pr_expiry, TS_MW );
2580
2581                                 // Only apply the restrictions if they haven't expired!
2582                                 if ( !$expiry || $expiry > $now ) {
2583                                         $this->mRestrictionsExpiry[$row->pr_type] = $expiry;
2584                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
2585
2586                                         $this->mCascadeRestriction |= $row->pr_cascade;
2587                                 } else {
2588                                         // Trigger a lazy purge of expired restrictions
2589                                         $purgeExpired = true;
2590                                 }
2591                         }
2592
2593                         if ( $purgeExpired ) {
2594                                 Title::purgeExpiredRestrictions();
2595                         }
2596                 }
2597
2598                 $this->mRestrictionsLoaded = true;
2599         }
2600
2601         /**
2602          * Load restrictions from the page_restrictions table
2603          *
2604          * @param $oldFashionedRestrictions String comma-separated list of page
2605          *        restrictions from page table (pre 1.10)
2606          */
2607         public function loadRestrictions( $oldFashionedRestrictions = null ) {
2608                 global $wgContLang;
2609                 if ( !$this->mRestrictionsLoaded ) {
2610                         if ( $this->exists() ) {
2611                                 $dbr = wfGetDB( DB_SLAVE );
2612
2613                                 $res = $dbr->select(
2614                                         'page_restrictions',
2615                                         '*',
2616                                         array( 'pr_page' => $this->getArticleID() ),
2617                                         __METHOD__
2618                                 );
2619
2620                                 $this->loadRestrictionsFromResultWrapper( $res, $oldFashionedRestrictions );
2621                         } else {
2622                                 $title_protection = $this->getTitleProtection();
2623
2624                                 if ( $title_protection ) {
2625                                         $now = wfTimestampNow();
2626                                         $expiry = $wgContLang->formatExpiry( $title_protection['pt_expiry'], TS_MW );
2627
2628                                         if ( !$expiry || $expiry > $now ) {
2629                                                 // Apply the restrictions
2630                                                 $this->mRestrictionsExpiry['create'] = $expiry;
2631                                                 $this->mRestrictions['create'] = explode( ',', trim( $title_protection['pt_create_perm'] ) );
2632                                         } else { // Get rid of the old restrictions
2633                                                 Title::purgeExpiredRestrictions();
2634                                                 $this->mTitleProtection = false;
2635                                         }
2636                                 } else {
2637                                         $this->mRestrictionsExpiry['create'] = $wgContLang->formatExpiry( '', TS_MW );
2638                                 }
2639                                 $this->mRestrictionsLoaded = true;
2640                         }
2641                 }
2642         }
2643
2644         /**
2645          * Flush the protection cache in this object and force reload from the database.
2646          * This is used when updating protection from WikiPage::doUpdateRestrictions().
2647          */
2648         public function flushRestrictions() {
2649                 $this->mRestrictionsLoaded = false;
2650                 $this->mTitleProtection = null;
2651         }
2652
2653         /**
2654          * Purge expired restrictions from the page_restrictions table
2655          */
2656         static function purgeExpiredRestrictions() {
2657                 $dbw = wfGetDB( DB_MASTER );
2658                 $dbw->delete(
2659                         'page_restrictions',
2660                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2661                         __METHOD__
2662                 );
2663
2664                 $dbw->delete(
2665                         'protected_titles',
2666                         array( 'pt_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
2667                         __METHOD__
2668                 );
2669         }
2670
2671         /**
2672          * Does this have subpages?  (Warning, usually requires an extra DB query.)
2673          *
2674          * @return Bool
2675          */
2676         public function hasSubpages() {
2677                 if ( !MWNamespace::hasSubpages( $this->mNamespace ) ) {
2678                         # Duh
2679                         return false;
2680                 }
2681
2682                 # We dynamically add a member variable for the purpose of this method
2683                 # alone to cache the result.  There's no point in having it hanging
2684                 # around uninitialized in every Title object; therefore we only add it
2685                 # if needed and don't declare it statically.
2686                 if ( isset( $this->mHasSubpages ) ) {
2687                         return $this->mHasSubpages;
2688                 }
2689
2690                 $subpages = $this->getSubpages( 1 );
2691                 if ( $subpages instanceof TitleArray ) {
2692                         return $this->mHasSubpages = (bool)$subpages->count();
2693                 }
2694                 return $this->mHasSubpages = false;
2695         }
2696
2697         /**
2698          * Get all subpages of this page.
2699          *
2700          * @param $limit Int maximum number of subpages to fetch; -1 for no limit
2701          * @return mixed TitleArray, or empty array if this page's namespace
2702          *  doesn't allow subpages
2703          */
2704         public function getSubpages( $limit = -1 ) {
2705                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
2706                         return array();
2707                 }
2708
2709                 $dbr = wfGetDB( DB_SLAVE );
2710                 $conds['page_namespace'] = $this->getNamespace();
2711                 $conds[] = 'page_title ' . $dbr->buildLike( $this->getDBkey() . '/', $dbr->anyString() );
2712                 $options = array();
2713                 if ( $limit > -1 ) {
2714                         $options['LIMIT'] = $limit;
2715                 }
2716                 return $this->mSubpages = TitleArray::newFromResult(
2717                         $dbr->select( 'page',
2718                                 array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' ),
2719                                 $conds,
2720                                 __METHOD__,
2721                                 $options
2722                         )
2723                 );
2724         }
2725
2726         /**
2727          * Is there a version of this page in the deletion archive?
2728          *
2729          * @return Int the number of archived revisions
2730          */
2731         public function isDeleted() {
2732                 if ( $this->getNamespace() < 0 ) {
2733                         $n = 0;
2734                 } else {
2735                         $dbr = wfGetDB( DB_SLAVE );
2736
2737                         $n = $dbr->selectField( 'archive', 'COUNT(*)',
2738                                 array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2739                                 __METHOD__
2740                         );
2741                         if ( $this->getNamespace() == NS_FILE ) {
2742                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
2743                                         array( 'fa_name' => $this->getDBkey() ),
2744                                         __METHOD__
2745                                 );
2746                         }
2747                 }
2748                 return (int)$n;
2749         }
2750
2751         /**
2752          * Is there a version of this page in the deletion archive?
2753          *
2754          * @return Boolean
2755          */
2756         public function isDeletedQuick() {
2757                 if ( $this->getNamespace() < 0 ) {
2758                         return false;
2759                 }
2760                 $dbr = wfGetDB( DB_SLAVE );
2761                 $deleted = (bool)$dbr->selectField( 'archive', '1',
2762                         array( 'ar_namespace' => $this->getNamespace(), 'ar_title' => $this->getDBkey() ),
2763                         __METHOD__
2764                 );
2765                 if ( !$deleted && $this->getNamespace() == NS_FILE ) {
2766                         $deleted = (bool)$dbr->selectField( 'filearchive', '1',
2767                                 array( 'fa_name' => $this->getDBkey() ),
2768                                 __METHOD__
2769                         );
2770                 }
2771                 return $deleted;
2772         }
2773
2774         /**
2775          * Get the article ID for this Title from the link cache,
2776          * adding it if necessary
2777          *
2778          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select
2779          *  for update
2780          * @return Int the ID
2781          */
2782         public function getArticleID( $flags = 0 ) {
2783                 if ( $this->getNamespace() < 0 ) {
2784                         return $this->mArticleID = 0;
2785                 }
2786                 $linkCache = LinkCache::singleton();
2787                 if ( $flags & self::GAID_FOR_UPDATE ) {
2788                         $oldUpdate = $linkCache->forUpdate( true );
2789                         $linkCache->clearLink( $this );
2790                         $this->mArticleID = $linkCache->addLinkObj( $this );
2791                         $linkCache->forUpdate( $oldUpdate );
2792                 } else {
2793                         if ( -1 == $this->mArticleID ) {
2794                                 $this->mArticleID = $linkCache->addLinkObj( $this );
2795                         }
2796                 }
2797                 return $this->mArticleID;
2798         }
2799
2800         /**
2801          * Is this an article that is a redirect page?
2802          * Uses link cache, adding it if necessary
2803          *
2804          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2805          * @return Bool
2806          */
2807         public function isRedirect( $flags = 0 ) {
2808                 if ( !is_null( $this->mRedirect ) ) {
2809                         return $this->mRedirect;
2810                 }
2811                 # Calling getArticleID() loads the field from cache as needed
2812                 if ( !$this->getArticleID( $flags ) ) {
2813                         return $this->mRedirect = false;
2814                 }
2815
2816                 $linkCache = LinkCache::singleton();
2817                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'redirect' );
2818                 assert( $cached !== null ); # assert the assumption that the cache actually knows about this title #XXX breaks stuff #TODO: use exception
2819
2820                 $this->mRedirect = (bool)$cached;
2821
2822                 return $this->mRedirect;
2823         }
2824
2825         /**
2826          * What is the length of this page?
2827          * Uses link cache, adding it if necessary
2828          *
2829          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2830          * @return Int
2831          */
2832         public function getLength( $flags = 0 ) {
2833                 if ( $this->mLength != -1 ) {
2834                         return $this->mLength;
2835                 }
2836                 # Calling getArticleID() loads the field from cache as needed
2837                 if ( !$this->getArticleID( $flags ) ) {
2838                         return $this->mLength = 0;
2839                 }
2840                 $linkCache = LinkCache::singleton();
2841                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'length' );
2842                 assert( $cached !== null ); # assert the assumption that the cache actually knows about this title #TODO: use exception
2843
2844                 $this->mLength = intval( $cached );
2845
2846                 return $this->mLength;
2847         }
2848
2849         /**
2850          * What is the page_latest field for this page?
2851          *
2852          * @param $flags Int a bit field; may be Title::GAID_FOR_UPDATE to select for update
2853          * @return Int or 0 if the page doesn't exist
2854          */
2855         public function getLatestRevID( $flags = 0 ) {
2856                 if ( $this->mLatestID !== false ) {
2857                         return intval( $this->mLatestID );
2858                 }
2859                 # Calling getArticleID() loads the field from cache as needed
2860                 if ( !$this->getArticleID( $flags ) ) {
2861                         return $this->mLatestID = 0;
2862                 }
2863                 $linkCache = LinkCache::singleton();
2864                 $cached = $linkCache->getGoodLinkFieldObj( $this, 'revision' );
2865                 assert( $cached !== null ); # assert the assumption that the cache actually knows about this title #TODO: use exception
2866
2867                 $this->mLatestID = intval( $cached );
2868
2869                 return $this->mLatestID;
2870         }
2871
2872         /**
2873          * This clears some fields in this object, and clears any associated
2874          * keys in the "bad links" section of the link cache.
2875          *
2876          * - This is called from WikiPage::doEdit() and WikiPage::insertOn() to allow
2877          * loading of the new page_id. It's also called from
2878          * WikiPage::doDeleteArticle()
2879          *
2880          * @param $newid Int the new Article ID
2881          */
2882         public function resetArticleID( $newid ) {
2883                 $linkCache = LinkCache::singleton();
2884                 $linkCache->clearLink( $this );
2885
2886                 if ( $newid === false ) {
2887                         $this->mArticleID = -1;
2888                 } else {
2889                         $this->mArticleID = intval( $newid );
2890                 }
2891                 $this->mRestrictionsLoaded = false;
2892                 $this->mRestrictions = array();
2893                 $this->mRedirect = null;
2894                 $this->mLength = -1;
2895                 $this->mLatestID = false;
2896                 $this->mEstimateRevisions = null;
2897         }
2898
2899         /**
2900          * Capitalize a text string for a title if it belongs to a namespace that capitalizes
2901          *
2902          * @param $text String containing title to capitalize
2903          * @param $ns int namespace index, defaults to NS_MAIN
2904          * @return String containing capitalized title
2905          */
2906         public static function capitalize( $text, $ns = NS_MAIN ) {
2907                 global $wgContLang;
2908
2909                 if ( MWNamespace::isCapitalized( $ns ) ) {
2910                         return $wgContLang->ucfirst( $text );
2911                 } else {
2912                         return $text;
2913                 }
2914         }
2915
2916         /**
2917          * Secure and split - main initialisation function for this object
2918          *
2919          * Assumes that mDbkeyform has been set, and is urldecoded
2920          * and uses underscores, but not otherwise munged.  This function
2921          * removes illegal characters, splits off the interwiki and
2922          * namespace prefixes, sets the other forms, and canonicalizes
2923          * everything.
2924          *
2925          * @return Bool true on success
2926          */
2927         private function secureAndSplit() {
2928                 global $wgContLang, $wgLocalInterwiki;
2929
2930                 # Initialisation
2931                 $this->mInterwiki = $this->mFragment = '';
2932                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
2933
2934                 $dbkey = $this->mDbkeyform;
2935
2936                 # Strip Unicode bidi override characters.
2937                 # Sometimes they slip into cut-n-pasted page titles, where the
2938                 # override chars get included in list displays.
2939                 $dbkey = preg_replace( '/\xE2\x80[\x8E\x8F\xAA-\xAE]/S', '', $dbkey );
2940
2941                 # Clean up whitespace
2942                 # Note: use of the /u option on preg_replace here will cause
2943                 # input with invalid UTF-8 sequences to be nullified out in PHP 5.2.x,
2944                 # conveniently disabling them.
2945                 $dbkey = preg_replace( '/[ _\xA0\x{1680}\x{180E}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}]+/u', '_', $dbkey );
2946                 $dbkey = trim( $dbkey, '_' );
2947
2948                 if ( $dbkey == '' ) {
2949                         return false;
2950                 }
2951
2952                 if ( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
2953                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
2954                         return false;
2955                 }
2956
2957                 $this->mDbkeyform = $dbkey;
2958
2959                 # Initial colon indicates main namespace rather than specified default
2960                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
2961                 if ( ':' == $dbkey[0] ) {
2962                         $this->mNamespace = NS_MAIN;
2963                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
2964                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
2965                 }
2966
2967                 # Namespace or interwiki prefix
2968                 $firstPass = true;
2969                 $prefixRegexp = "/^(.+?)_*:_*(.*)$/S";
2970                 do {
2971                         $m = array();
2972                         if ( preg_match( $prefixRegexp, $dbkey, $m ) ) {
2973                                 $p = $m[1];
2974                                 if ( ( $ns = $wgContLang->getNsIndex( $p ) ) !== false ) {
2975                                         # Ordinary namespace
2976                                         $dbkey = $m[2];
2977                                         $this->mNamespace = $ns;
2978                                         # For Talk:X pages, check if X has a "namespace" prefix
2979                                         if ( $ns == NS_TALK && preg_match( $prefixRegexp, $dbkey, $x ) ) {
2980                                                 if ( $wgContLang->getNsIndex( $x[1] ) ) {
2981                                                         # Disallow Talk:File:x type titles...
2982                                                         return false;
2983                                                 } elseif ( Interwiki::isValidInterwiki( $x[1] ) ) {
2984                                                         # Disallow Talk:Interwiki:x type titles...
2985                                                         return false;
2986                                                 }
2987                                         }
2988                                 } elseif ( Interwiki::isValidInterwiki( $p ) ) {
2989                                         if ( !$firstPass ) {
2990                                                 # Can't make a local interwiki link to an interwiki link.
2991                                                 # That's just crazy!
2992                                                 return false;
2993                                         }
2994
2995                                         # Interwiki link
2996                                         $dbkey = $m[2];
2997                                         $this->mInterwiki = $wgContLang->lc( $p );
2998
2999                                         # Redundant interwiki prefix to the local wiki
3000                                         if ( $wgLocalInterwiki !== false
3001                                                 && 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) )
3002                                         {
3003                                                 if ( $dbkey == '' ) {
3004                                                         # Can't have an empty self-link
3005                                                         return false;
3006                                                 }
3007                                                 $this->mInterwiki = '';
3008                                                 $firstPass = false;
3009                                                 # Do another namespace split...
3010                                                 continue;
3011                                         }
3012
3013                                         # If there's an initial colon after the interwiki, that also
3014                                         # resets the default namespace
3015                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
3016                                                 $this->mNamespace = NS_MAIN;
3017                                                 $dbkey = substr( $dbkey, 1 );
3018                                         }
3019                                 }
3020                                 # If there's no recognized interwiki or namespace,
3021                                 # then let the colon expression be part of the title.
3022                         }
3023                         break;
3024                 } while ( true );
3025
3026                 # We already know that some pages won't be in the database!
3027                 if ( $this->mInterwiki != '' || NS_SPECIAL == $this->mNamespace ) {
3028                         $this->mArticleID = 0;
3029                 }
3030                 $fragment = strstr( $dbkey, '#' );
3031                 if ( false !== $fragment ) {
3032                         $this->setFragment( $fragment );
3033                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
3034                         # remove whitespace again: prevents "Foo_bar_#"
3035                         # becoming "Foo_bar_"
3036                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
3037                 }
3038
3039                 # Reject illegal characters.
3040                 $rxTc = self::getTitleInvalidRegex();
3041                 if ( preg_match( $rxTc, $dbkey ) ) {
3042                         return false;
3043                 }
3044
3045                 # Pages with "/./" or "/../" appearing in the URLs will often be un-
3046                 # reachable due to the way web browsers deal with 'relative' URLs.
3047                 # Also, they conflict with subpage syntax.  Forbid them explicitly.
3048                 if ( strpos( $dbkey, '.' ) !== false &&
3049                          ( $dbkey === '.' || $dbkey === '..' ||
3050                            strpos( $dbkey, './' ) === 0  ||
3051                            strpos( $dbkey, '../' ) === 0 ||
3052                            strpos( $dbkey, '/./' ) !== false ||
3053                            strpos( $dbkey, '/../' ) !== false  ||
3054                            substr( $dbkey, -2 ) == '/.' ||
3055                            substr( $dbkey, -3 ) == '/..' ) )
3056                 {
3057                         return false;
3058                 }
3059
3060                 # Magic tilde sequences? Nu-uh!
3061                 if ( strpos( $dbkey, '~~~' ) !== false ) {
3062                         return false;
3063                 }
3064
3065                 # Limit the size of titles to 255 bytes. This is typically the size of the
3066                 # underlying database field. We make an exception for special pages, which
3067                 # don't need to be stored in the database, and may edge over 255 bytes due
3068                 # to subpage syntax for long titles, e.g. [[Special:Block/Long name]]
3069                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
3070                   strlen( $dbkey ) > 512 )
3071                 {
3072                         return false;
3073                 }
3074
3075                 # Normally, all wiki links are forced to have an initial capital letter so [[foo]]
3076                 # and [[Foo]] point to the same place.  Don't force it for interwikis, since the
3077                 # other site might be case-sensitive.
3078                 $this->mUserCaseDBKey = $dbkey;
3079                 if ( $this->mInterwiki == '' ) {
3080                         $dbkey = self::capitalize( $dbkey, $this->mNamespace );
3081                 }
3082
3083                 # Can't make a link to a namespace alone... "empty" local links can only be
3084                 # self-links with a fragment identifier.
3085                 if ( $dbkey == '' && $this->mInterwiki == '' && $this->mNamespace != NS_MAIN ) {
3086                         return false;
3087                 }
3088
3089                 // Allow IPv6 usernames to start with '::' by canonicalizing IPv6 titles.
3090                 // IP names are not allowed for accounts, and can only be referring to
3091                 // edits from the IP. Given '::' abbreviations and caps/lowercaps,
3092                 // there are numerous ways to present the same IP. Having sp:contribs scan
3093                 // them all is silly and having some show the edits and others not is
3094                 // inconsistent. Same for talk/userpages. Keep them normalized instead.
3095                 $dbkey = ( $this->mNamespace == NS_USER || $this->mNamespace == NS_USER_TALK )
3096                         ? IP::sanitizeIP( $dbkey )
3097                         : $dbkey;
3098
3099                 // Any remaining initial :s are illegal.
3100                 if ( $dbkey !== '' && ':' == $dbkey[0] ) {
3101                         return false;
3102                 }
3103
3104                 # Fill fields
3105                 $this->mDbkeyform = $dbkey;
3106                 $this->mUrlform = wfUrlencode( $dbkey );
3107
3108                 $this->mTextform = str_replace( '_', ' ', $dbkey );
3109
3110                 return true;
3111         }
3112
3113         /**
3114          * Get an array of Title objects linking to this Title
3115          * Also stores the IDs in the link cache.
3116          *
3117          * WARNING: do not use this function on arbitrary user-supplied titles!
3118          * On heavily-used templates it will max out the memory.
3119          *
3120          * @param $options Array: may be FOR UPDATE
3121          * @param $table String: table name
3122          * @param $prefix String: fields prefix
3123          * @return Array of Title objects linking here
3124          */
3125         public function getLinksTo( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3126                 if ( count( $options ) > 0 ) {
3127                         $db = wfGetDB( DB_MASTER );
3128                 } else {
3129                         $db = wfGetDB( DB_SLAVE );
3130                 }
3131
3132                 $res = $db->select(
3133                         array( 'page', $table ),
3134                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3135                         array(
3136                                 "{$prefix}_from=page_id",
3137                                 "{$prefix}_namespace" => $this->getNamespace(),
3138                                 "{$prefix}_title"     => $this->getDBkey() ),
3139                         __METHOD__,
3140                         $options
3141                 );
3142
3143                 $retVal = array();
3144                 if ( $res->numRows() ) {
3145                         $linkCache = LinkCache::singleton();
3146                         foreach ( $res as $row ) {
3147                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
3148                                 if ( $titleObj ) {
3149                                         $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3150                                         $retVal[] = $titleObj;
3151                                 }
3152                         }
3153                 }
3154                 return $retVal;
3155         }
3156
3157         /**
3158          * Get an array of Title objects using this Title as a template
3159          * Also stores the IDs in the link cache.
3160          *
3161          * WARNING: do not use this function on arbitrary user-supplied titles!
3162          * On heavily-used templates it will max out the memory.
3163          *
3164          * @param $options Array: may be FOR UPDATE
3165          * @return Array of Title the Title objects linking here
3166          */
3167         public function getTemplateLinksTo( $options = array() ) {
3168                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
3169         }
3170
3171         /**
3172          * Get an array of Title objects linked from this Title
3173          * Also stores the IDs in the link cache.
3174          *
3175          * WARNING: do not use this function on arbitrary user-supplied titles!
3176          * On heavily-used templates it will max out the memory.
3177          *
3178          * @param $options Array: may be FOR UPDATE
3179          * @param $table String: table name
3180          * @param $prefix String: fields prefix
3181          * @return Array of Title objects linking here
3182          */
3183         public function getLinksFrom( $options = array(), $table = 'pagelinks', $prefix = 'pl' ) {
3184                 $id = $this->getArticleID();
3185
3186                 # If the page doesn't exist; there can't be any link from this page
3187                 if ( !$id ) {
3188                         return array();
3189                 }
3190
3191                 if ( count( $options ) > 0 ) {
3192                         $db = wfGetDB( DB_MASTER );
3193                 } else {
3194                         $db = wfGetDB( DB_SLAVE );
3195                 }
3196
3197                 $namespaceFiled = "{$prefix}_namespace";
3198                 $titleField = "{$prefix}_title";
3199
3200                 $res = $db->select(
3201                         array( $table, 'page' ),
3202                         array( $namespaceFiled, $titleField, 'page_id', 'page_len', 'page_is_redirect', 'page_latest' ),
3203                         array( "{$prefix}_from" => $id ),
3204                         __METHOD__,
3205                         $options,
3206                         array( 'page' => array( 'LEFT JOIN', array( "page_namespace=$namespaceFiled", "page_title=$titleField" ) ) )
3207                 );
3208
3209                 $retVal = array();
3210                 if ( $res->numRows() ) {
3211                         $linkCache = LinkCache::singleton();
3212                         foreach ( $res as $row ) {
3213                                 $titleObj = Title::makeTitle( $row->$namespaceFiled, $row->$titleField );
3214                                 if ( $titleObj ) {
3215                                         if ( $row->page_id ) {
3216                                                 $linkCache->addGoodLinkObjFromRow( $titleObj, $row );
3217                                         } else {
3218                                                 $linkCache->addBadLinkObj( $titleObj );
3219                                         }
3220                                         $retVal[] = $titleObj;
3221                                 }
3222                         }
3223                 }
3224                 return $retVal;
3225         }
3226
3227         /**
3228          * Get an array of Title objects used on this Title as a template
3229          * Also stores the IDs in the link cache.
3230          *
3231          * WARNING: do not use this function on arbitrary user-supplied titles!
3232          * On heavily-used templates it will max out the memory.
3233          *
3234          * @param $options Array: may be FOR UPDATE
3235          * @return Array of Title the Title objects used here
3236          */
3237         public function getTemplateLinksFrom( $options = array() ) {
3238                 return $this->getLinksFrom( $options, 'templatelinks', 'tl' );
3239         }
3240
3241         /**
3242          * Get an array of Title objects referring to non-existent articles linked from this page
3243          *
3244          * @todo check if needed (used only in SpecialBrokenRedirects.php, and should use redirect table in this case)
3245          * @return Array of Title the Title objects
3246          */
3247         public function getBrokenLinksFrom() {
3248                 if ( $this->getArticleID() == 0 ) {
3249                         # All links from article ID 0 are false positives
3250                         return array();
3251                 }
3252
3253                 $dbr = wfGetDB( DB_SLAVE );
3254                 $res = $dbr->select(
3255                         array( 'page', 'pagelinks' ),
3256                         array( 'pl_namespace', 'pl_title' ),
3257                         array(
3258                                 'pl_from' => $this->getArticleID(),
3259                                 'page_namespace IS NULL'
3260                         ),
3261                         __METHOD__, array(),
3262                         array(
3263                                 'page' => array(
3264                                         'LEFT JOIN',
3265                                         array( 'pl_namespace=page_namespace', 'pl_title=page_title' )
3266                                 )
3267                         )
3268                 );
3269
3270                 $retVal = array();
3271                 foreach ( $res as $row ) {
3272                         $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
3273                 }
3274                 return $retVal;
3275         }
3276
3277
3278         /**
3279          * Get a list of URLs to purge from the Squid cache when this
3280          * page changes
3281          *
3282          * @return Array of String the URLs
3283          */
3284         public function getSquidURLs() {
3285                 global $wgContLang;
3286
3287                 $urls = array(
3288                         $this->getInternalURL(),
3289                         $this->getInternalURL( 'action=history' )
3290                 );
3291
3292                 // purge variant urls as well
3293                 if ( $wgContLang->hasVariants() ) {
3294                         $variants = $wgContLang->getVariants();
3295                         foreach ( $variants as $vCode ) {
3296                                 $urls[] = $this->getInternalURL( '', $vCode );
3297                         }
3298                 }
3299
3300                 return $urls;
3301         }
3302
3303         /**
3304          * Purge all applicable Squid URLs
3305          */
3306         public function purgeSquid() {
3307                 global $wgUseSquid;
3308                 if ( $wgUseSquid ) {
3309                         $urls = $this->getSquidURLs();
3310                         $u = new SquidUpdate( $urls );
3311                         $u->doUpdate();
3312                 }
3313         }
3314
3315         /**
3316          * Move this page without authentication
3317          *
3318          * @param $nt Title the new page Title
3319          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3320          */
3321         public function moveNoAuth( &$nt ) {
3322                 return $this->moveTo( $nt, false );
3323         }
3324
3325         /**
3326          * Check whether a given move operation would be valid.
3327          * Returns true if ok, or a getUserPermissionsErrors()-like array otherwise
3328          *
3329          * @param $nt Title the new title
3330          * @param $auth Bool indicates whether $wgUser's permissions
3331          *  should be checked
3332          * @param $reason String is the log summary of the move, used for spam checking
3333          * @return Mixed True on success, getUserPermissionsErrors()-like array on failure
3334          */
3335         public function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
3336                 global $wgUser;
3337
3338                 $errors = array();
3339                 if ( !$nt ) {
3340                         // Normally we'd add this to $errors, but we'll get
3341                         // lots of syntax errors if $nt is not an object
3342                         return array( array( 'badtitletext' ) );
3343                 }
3344                 if ( $this->equals( $nt ) ) {
3345                         $errors[] = array( 'selfmove' );
3346                 }
3347                 if ( !$this->isMovable() ) {
3348                         $errors[] = array( 'immobile-source-namespace', $this->getNsText() );
3349                 }
3350                 if ( $nt->getInterwiki() != '' ) {
3351                         $errors[] = array( 'immobile-target-namespace-iw' );
3352                 }
3353                 if ( !$nt->isMovable() ) {
3354                         $errors[] = array( 'immobile-target-namespace', $nt->getNsText() );
3355                 }
3356
3357                 $oldid = $this->getArticleID();
3358                 $newid = $nt->getArticleID();
3359
3360                 if ( strlen( $nt->getDBkey() ) < 1 ) {
3361                         $errors[] = array( 'articleexists' );
3362                 }
3363                 if ( ( $this->getDBkey() == '' ) ||
3364                          ( !$oldid ) ||
3365                          ( $nt->getDBkey() == '' ) ) {
3366                         $errors[] = array( 'badarticleerror' );
3367                 }
3368
3369                 // Image-specific checks
3370                 if ( $this->getNamespace() == NS_FILE ) {
3371                         $errors = array_merge( $errors, $this->validateFileMoveOperation( $nt ) );
3372                 }
3373
3374                 if ( $nt->getNamespace() == NS_FILE && $this->getNamespace() != NS_FILE ) {
3375                         $errors[] = array( 'nonfile-cannot-move-to-file' );
3376                 }
3377
3378                 if ( $auth ) {
3379                         $errors = wfMergeErrorArrays( $errors,
3380                                 $this->getUserPermissionsErrors( 'move', $wgUser ),
3381                                 $this->getUserPermissionsErrors( 'edit', $wgUser ),
3382                                 $nt->getUserPermissionsErrors( 'move-target', $wgUser ),
3383                                 $nt->getUserPermissionsErrors( 'edit', $wgUser ) );
3384                 }
3385
3386                 $match = EditPage::matchSummarySpamRegex( $reason );
3387                 if ( $match !== false ) {
3388                         // This is kind of lame, won't display nice
3389                         $errors[] = array( 'spamprotectiontext' );
3390                 }
3391
3392                 $err = null;
3393                 if ( !wfRunHooks( 'AbortMove', array( $this, $nt, $wgUser, &$err, $reason ) ) ) {
3394                         $errors[] = array( 'hookaborted', $err );
3395                 }
3396
3397                 # The move is allowed only if (1) the target doesn't exist, or
3398                 # (2) the target is a redirect to the source, and has no history
3399                 # (so we can undo bad moves right after they're done).
3400
3401                 if ( 0 != $newid ) { # Target exists; check for validity
3402                         if ( !$this->isValidMoveTarget( $nt ) ) {
3403                                 $errors[] = array( 'articleexists' );
3404                         }
3405                 } else {
3406                         $tp = $nt->getTitleProtection();
3407                         $right = ( $tp['pt_create_perm'] == 'sysop' ) ? 'protect' : $tp['pt_create_perm'];
3408                         if ( $tp and !$wgUser->isAllowed( $right ) ) {
3409                                 $errors[] = array( 'cantmove-titleprotected' );
3410                         }
3411                 }
3412                 if ( empty( $errors ) ) {
3413                         return true;
3414                 }
3415                 return $errors;
3416         }
3417
3418         /**
3419          * Check if the requested move target is a valid file move target
3420          * @param Title $nt Target title
3421          * @return array List of errors
3422          */
3423         protected function validateFileMoveOperation( $nt ) {
3424                 global $wgUser;
3425
3426                 $errors = array();
3427
3428                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is not allowed until below
3429
3430                 $file = wfLocalFile( $this );
3431                 if ( $file->exists() ) {
3432                         if ( $nt->getText() != wfStripIllegalFilenameChars( $nt->getText() ) ) {
3433                                 $errors[] = array( 'imageinvalidfilename' );
3434                         }
3435                         if ( !File::checkExtensionCompatibility( $file, $nt->getDBkey() ) ) {
3436                                 $errors[] = array( 'imagetypemismatch' );
3437                         }
3438                 }
3439
3440                 if ( $nt->getNamespace() != NS_FILE ) {
3441                         $errors[] = array( 'imagenocrossnamespace' );
3442                         // From here we want to do checks on a file object, so if we can't
3443                         // create one, we must return.
3444                         return $errors;
3445                 }
3446
3447                 // wfFindFile( $nt ) / wfLocalFile( $nt ) is allowed below here
3448
3449                 $destFile = wfLocalFile( $nt );
3450                 if ( !$wgUser->isAllowed( 'reupload-shared' ) && !$destFile->exists() && wfFindFile( $nt ) ) {
3451                         $errors[] = array( 'file-exists-sharedrepo' );
3452                 }
3453
3454                 return $errors;
3455         }
3456
3457         /**
3458          * Move a title to a new location
3459          *
3460          * @param $nt Title the new title
3461          * @param $auth Bool indicates whether $wgUser's permissions
3462          *  should be checked
3463          * @param $reason String the reason for the move
3464          * @param $createRedirect Bool Whether to create a redirect from the old title to the new title.
3465          *  Ignored if the user doesn't have the suppressredirect right.
3466          * @return Mixed true on success, getUserPermissionsErrors()-like array on failure
3467          */
3468         public function moveTo( &$nt, $auth = true, $reason = '', $createRedirect = true ) {
3469                 global $wgUser;
3470                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
3471                 if ( is_array( $err ) ) {
3472                         // Auto-block user's IP if the account was "hard" blocked
3473                         $wgUser->spreadAnyEditBlock();
3474                         return $err;
3475                 }
3476
3477                 // If it is a file, move it first.
3478                 // It is done before all other moving stuff is done because it's hard to revert.
3479                 $dbw = wfGetDB( DB_MASTER );
3480                 if ( $this->getNamespace() == NS_FILE ) {
3481                         $file = wfLocalFile( $this );
3482                         if ( $file->exists() ) {
3483                                 $status = $file->move( $nt );
3484                                 if ( !$status->isOk() ) {
3485                                         return $status->getErrorsArray();
3486                                 }
3487                         }
3488                         // Clear RepoGroup process cache
3489                         RepoGroup::singleton()->clearCache( $this );
3490                         RepoGroup::singleton()->clearCache( $nt ); # clear false negative cache
3491                 }
3492
3493                 $dbw->begin( __METHOD__ ); # If $file was a LocalFile, its transaction would have closed our own.
3494                 $pageid = $this->getArticleID( self::GAID_FOR_UPDATE );
3495                 $protected = $this->isProtected();
3496
3497                 // Do the actual move
3498                 $this->moveToInternal( $nt, $reason, $createRedirect );
3499
3500                 // Refresh the sortkey for this row.  Be careful to avoid resetting
3501                 // cl_timestamp, which may disturb time-based lists on some sites.
3502                 $prefixes = $dbw->select(
3503                         'categorylinks',
3504                         array( 'cl_sortkey_prefix', 'cl_to' ),
3505                         array( 'cl_from' => $pageid ),
3506                         __METHOD__
3507                 );
3508                 foreach ( $prefixes as $prefixRow ) {
3509                         $prefix = $prefixRow->cl_sortkey_prefix;
3510                         $catTo = $prefixRow->cl_to;
3511                         $dbw->update( 'categorylinks',
3512                                 array(
3513                                         'cl_sortkey' => Collation::singleton()->getSortKey(
3514                                                 $nt->getCategorySortkey( $prefix ) ),
3515                                         'cl_timestamp=cl_timestamp' ),
3516                                 array(
3517                                         'cl_from' => $pageid,
3518                                         'cl_to' => $catTo ),
3519                                 __METHOD__
3520                         );
3521                 }
3522
3523                 $redirid = $this->getArticleID();
3524
3525                 if ( $protected ) {
3526                         # Protect the redirect title as the title used to be...
3527                         $dbw->insertSelect( 'page_restrictions', 'page_restrictions',
3528                                 array(
3529                                         'pr_page'    => $redirid,
3530                                         'pr_type'    => 'pr_type',
3531                                         'pr_level'   => 'pr_level',
3532                                         'pr_cascade' => 'pr_cascade',
3533                                         'pr_user'    => 'pr_user',
3534                                         'pr_expiry'  => 'pr_expiry'
3535                                 ),
3536                                 array( 'pr_page' => $pageid ),
3537                                 __METHOD__,
3538                                 array( 'IGNORE' )
3539                         );
3540                         # Update the protection log
3541                         $log = new LogPage( 'protect' );
3542                         $comment = wfMsgForContent( 'prot_1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
3543                         if ( $reason ) {
3544                                 $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3545                         }
3546                         // @todo FIXME: $params?
3547                         $log->addEntry( 'move_prot', $nt, $comment, array( $this->getPrefixedText() ) );
3548                 }
3549
3550                 # Update watchlists
3551                 $oldnamespace = $this->getNamespace() & ~1;
3552                 $newnamespace = $nt->getNamespace() & ~1;
3553                 $oldtitle = $this->getDBkey();
3554                 $newtitle = $nt->getDBkey();
3555
3556                 if ( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
3557                         WatchedItem::duplicateEntries( $this, $nt );
3558                 }
3559
3560                 $dbw->commit( __METHOD__ );
3561
3562                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
3563                 return true;
3564         }
3565
3566         /**
3567          * Move page to a title which is either a redirect to the
3568          * source page or nonexistent
3569          *
3570          * @param $nt Title the page to move to, which should be a redirect or nonexistent
3571          * @param $reason String The reason for the move
3572          * @param $createRedirect Bool Whether to leave a redirect at the old title.  Ignored
3573          *   if the user doesn't have the suppressredirect right
3574          * @throws MWException
3575          */
3576         private function moveToInternal( &$nt, $reason = '', $createRedirect = true ) {
3577                 global $wgUser, $wgContLang;
3578
3579                 if ( $nt->exists() ) {
3580                         $moveOverRedirect = true;
3581                         $logType = 'move_redir';
3582                 } else {
3583                         $moveOverRedirect = false;
3584                         $logType = 'move';
3585                 }
3586
3587                 $redirectSuppressed = !$createRedirect && $wgUser->isAllowed( 'suppressredirect' );
3588
3589                 $logEntry = new ManualLogEntry( 'move', $logType );
3590                 $logEntry->setPerformer( $wgUser );
3591                 $logEntry->setTarget( $this );
3592                 $logEntry->setComment( $reason );
3593                 $logEntry->setParameters( array(
3594                         '4::target' => $nt->getPrefixedText(),
3595                         '5::noredir' => $redirectSuppressed ? '1': '0',
3596                 ) );
3597
3598                 $formatter = LogFormatter::newFromEntry( $logEntry );
3599                 $formatter->setContext( RequestContext::newExtraneousContext( $this ) );
3600                 $comment = $formatter->getPlainActionText();
3601                 if ( $reason ) {
3602                         $comment .= wfMsgForContent( 'colon-separator' ) . $reason;
3603                 }
3604                 # Truncate for whole multibyte characters.
3605                 $comment = $wgContLang->truncate( $comment, 255 );
3606
3607                 $oldid = $this->getArticleID();
3608
3609                 $dbw = wfGetDB( DB_MASTER );
3610
3611                 $newpage = WikiPage::factory( $nt );
3612
3613                 if ( $moveOverRedirect ) {
3614                         $newid = $nt->getArticleID();
3615
3616                         # Delete the old redirect. We don't save it to history since
3617                         # by definition if we've got here it's rather uninteresting.
3618                         # We have to remove it so that the next step doesn't trigger
3619                         # a conflict on the unique namespace+title index...
3620                         $dbw->delete( 'page', array( 'page_id' => $newid ), __METHOD__ );
3621
3622                         $newpage->doDeleteUpdates( $newid );
3623                 }
3624
3625                 # Save a null revision in the page's history notifying of the move
3626                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
3627                 if ( !is_object( $nullRevision ) ) {
3628                         throw new MWException( 'No valid null revision produced in ' . __METHOD__ );
3629                 }
3630                 $nullRevId = $nullRevision->insertOn( $dbw );
3631
3632                 # Change the name of the target page:
3633                 $dbw->update( 'page',
3634                         /* SET */ array(
3635                                 'page_namespace' => $nt->getNamespace(),
3636                                 'page_title'     => $nt->getDBkey(),
3637                         ),
3638                         /* WHERE */ array( 'page_id' => $oldid ),
3639                         __METHOD__
3640                 );
3641
3642                 $this->resetArticleID( 0 );
3643                 $nt->resetArticleID( $oldid );
3644
3645                 $newpage->updateRevisionOn( $dbw, $nullRevision );
3646
3647                 wfRunHooks( 'NewRevisionFromEditComplete',
3648                         array( $newpage, $nullRevision, $nullRevision->getParentId(), $wgUser ) );
3649
3650                 $newpage->doEditUpdates( $nullRevision, $wgUser, array( 'changed' => false ) );
3651
3652                 if ( !$moveOverRedirect ) {
3653                         WikiPage::onArticleCreate( $nt );
3654                 }
3655
3656                 # Recreate the redirect, this time in the other direction.
3657                 if ( $redirectSuppressed ) {
3658                         WikiPage::onArticleDelete( $this );
3659                 } else {
3660                         $mwRedir = MagicWord::get( 'redirect' );
3661                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
3662                         $redirectArticle = WikiPage::factory( $this );
3663                         $newid = $redirectArticle->insertOn( $dbw );
3664                         if ( $newid ) { // sanity
3665                                 $redirectRevision = new Revision( array(
3666                                         'page'    => $newid,
3667                                         'comment' => $comment,
3668                                         'text'    => $redirectText ) );
3669                                 $redirectRevision->insertOn( $dbw );
3670                                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
3671
3672                                 wfRunHooks( 'NewRevisionFromEditComplete',
3673                                         array( $redirectArticle, $redirectRevision, false, $wgUser ) );
3674
3675                                 $redirectArticle->doEditUpdates( $redirectRevision, $wgUser, array( 'created' => true ) );
3676                         }
3677                 }
3678
3679                 # Log the move
3680                 $logid = $logEntry->insert();
3681                 $logEntry->publish( $logid );
3682         }
3683
3684         /**
3685          * Move this page's subpages to be subpages of $nt
3686          *
3687          * @param $nt Title Move target
3688          * @param $auth bool Whether $wgUser's permissions should be checked
3689          * @param $reason string The reason for the move
3690          * @param $createRedirect bool Whether to create redirects from the old subpages to
3691          *     the new ones Ignored if the user doesn't have the 'suppressredirect' right
3692          * @return mixed array with old page titles as keys, and strings (new page titles) or
3693          *     arrays (errors) as values, or an error array with numeric indices if no pages
3694          *     were moved
3695          */
3696         public function moveSubpages( $nt, $auth = true, $reason = '', $createRedirect = true ) {
3697                 global $wgMaximumMovedPages;
3698                 // Check permissions
3699                 if ( !$this->userCan( 'move-subpages' ) ) {
3700                         return array( 'cant-move-subpages' );
3701                 }
3702                 // Do the source and target namespaces support subpages?
3703                 if ( !MWNamespace::hasSubpages( $this->getNamespace() ) ) {
3704                         return array( 'namespace-nosubpages',
3705                                 MWNamespace::getCanonicalName( $this->getNamespace() ) );
3706                 }
3707                 if ( !MWNamespace::hasSubpages( $nt->getNamespace() ) ) {
3708                         return array( 'namespace-nosubpages',
3709                                 MWNamespace::getCanonicalName( $nt->getNamespace() ) );
3710                 }
3711
3712                 $subpages = $this->getSubpages( $wgMaximumMovedPages + 1 );
3713                 $retval = array();
3714                 $count = 0;
3715                 foreach ( $subpages as $oldSubpage ) {
3716                         $count++;
3717                         if ( $count > $wgMaximumMovedPages ) {
3718                                 $retval[$oldSubpage->getPrefixedTitle()] =
3719                                                 array( 'movepage-max-pages',
3720                                                         $wgMaximumMovedPages );
3721                                 break;
3722                         }
3723
3724                         // We don't know whether this function was called before
3725                         // or after moving the root page, so check both
3726                         // $this and $nt
3727                         if ( $oldSubpage->getArticleID() == $this->getArticleID() ||
3728                                         $oldSubpage->getArticleID() == $nt->getArticleID() )
3729                         {
3730                                 // When moving a page to a subpage of itself,
3731                                 // don't move it twice
3732                                 continue;
3733                         }
3734                         $newPageName = preg_replace(
3735                                         '#^' . preg_quote( $this->getDBkey(), '#' ) . '#',
3736                                         StringUtils::escapeRegexReplacement( $nt->getDBkey() ), # bug 21234
3737                                         $oldSubpage->getDBkey() );
3738                         if ( $oldSubpage->isTalkPage() ) {
3739                                 $newNs = $nt->getTalkPage()->getNamespace();
3740                         } else {
3741                                 $newNs = $nt->getSubjectPage()->getNamespace();
3742                         }
3743                         # Bug 14385: we need makeTitleSafe because the new page names may
3744                         # be longer than 255 characters.
3745                         $newSubpage = Title::makeTitleSafe( $newNs, $newPageName );
3746
3747                         $success = $oldSubpage->moveTo( $newSubpage, $auth, $reason, $createRedirect );
3748                         if ( $success === true ) {
3749                                 $retval[$oldSubpage->getPrefixedText()] = $newSubpage->getPrefixedText();
3750                         } else {
3751                                 $retval[$oldSubpage->getPrefixedText()] = $success;
3752                         }
3753                 }
3754                 return $retval;
3755         }
3756
3757         /**
3758          * Checks if this page is just a one-rev redirect.
3759          * Adds lock, so don't use just for light purposes.
3760          *
3761          * @return Bool
3762          */
3763         public function isSingleRevRedirect() {
3764                 $dbw = wfGetDB( DB_MASTER );
3765                 # Is it a redirect?
3766                 $row = $dbw->selectRow( 'page',
3767                         array( 'page_is_redirect', 'page_latest', 'page_id' ),
3768                         $this->pageCond(),
3769                         __METHOD__,
3770                         array( 'FOR UPDATE' )
3771                 );
3772                 # Cache some fields we may want
3773                 $this->mArticleID = $row ? intval( $row->page_id ) : 0;
3774                 $this->mRedirect = $row ? (bool)$row->page_is_redirect : false;
3775                 $this->mLatestID = $row ? intval( $row->page_latest ) : false;
3776                 if ( !$this->mRedirect ) {
3777                         return false;
3778                 }
3779                 # Does the article have a history?
3780                 $row = $dbw->selectField( array( 'page', 'revision' ),
3781                         'rev_id',
3782                         array( 'page_namespace' => $this->getNamespace(),
3783                                 'page_title' => $this->getDBkey(),
3784                                 'page_id=rev_page',
3785                                 'page_latest != rev_id'
3786                         ),
3787                         __METHOD__,
3788                         array( 'FOR UPDATE' )
3789                 );
3790                 # Return true if there was no history
3791                 return ( $row === false );
3792         }
3793
3794         /**
3795          * Checks if $this can be moved to a given Title
3796          * - Selects for update, so don't call it unless you mean business
3797          *
3798          * @param $nt Title the new title to check
3799          * @return Bool
3800          */
3801         public function isValidMoveTarget( $nt ) {
3802                 # Is it an existing file?
3803                 if ( $nt->getNamespace() == NS_FILE ) {
3804                         $file = wfLocalFile( $nt );
3805                         if ( $file->exists() ) {
3806                                 wfDebug( __METHOD__ . ": file exists\n" );
3807                                 return false;
3808                         }
3809                 }
3810                 # Is it a redirect with no history?
3811                 if ( !$nt->isSingleRevRedirect() ) {
3812                         wfDebug( __METHOD__ . ": not a one-rev redirect\n" );
3813                         return false;
3814                 }
3815                 # Get the article text
3816                 $rev = Revision::newFromTitle( $nt );
3817                 if( !is_object( $rev ) ){
3818                         return false;
3819                 }
3820                 $content = $rev->getContent();
3821                 # Does the redirect point to the source?
3822                 # Or is it a broken self-redirect, usually caused by namespace collisions?
3823                 $redirTitle = $content->getRedirectTarget();
3824
3825                 if ( $redirTitle ) {
3826                         if ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
3827                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) {
3828                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
3829                                 return false;
3830                         } else {
3831                                 return true;
3832                         }
3833                 } else {
3834                         # Fail safe (not a redirect after all. strange.)
3835                         wfDebug( __METHOD__ . ": failsafe: database sais " . $nt->getPrefixedDBkey() . " is a redirect, but it doesn't contain a valid redirect.\n" );
3836                         return false;
3837                 }
3838         }
3839
3840         /**
3841          * Get categories to which this Title belongs and return an array of
3842          * categories' names.
3843          *
3844          * @return Array of parents in the form:
3845          *        $parent => $currentarticle
3846          */
3847         public function getParentCategories() {
3848                 global $wgContLang;
3849
3850                 $data = array();
3851
3852                 $titleKey = $this->getArticleID();
3853
3854                 if ( $titleKey === 0 ) {
3855                         return $data;
3856                 }
3857
3858                 $dbr = wfGetDB( DB_SLAVE );
3859
3860                 $res = $dbr->select( 'categorylinks', '*',
3861                         array(
3862                                 'cl_from' => $titleKey,
3863                         ),
3864                         __METHOD__,
3865                         array()
3866                 );
3867
3868                 if ( $dbr->numRows( $res ) > 0 ) {
3869                         foreach ( $res as $row ) {
3870                                 // $data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$row->cl_to);
3871                                 $data[$wgContLang->getNSText( NS_CATEGORY ) . ':' . $row->cl_to] = $this->getFullText();
3872                         }
3873                 }
3874                 return $data;
3875         }
3876
3877         /**
3878          * Get a tree of parent categories
3879          *
3880          * @param $children Array with the children in the keys, to check for circular refs
3881          * @return Array Tree of parent categories
3882          */
3883         public function getParentCategoryTree( $children = array() ) {
3884                 $stack = array();
3885                 $parents = $this->getParentCategories();
3886
3887                 if ( $parents ) {
3888                         foreach ( $parents as $parent => $current ) {
3889                                 if ( array_key_exists( $parent, $children ) ) {
3890                                         # Circular reference
3891                                         $stack[$parent] = array();
3892                                 } else {
3893                                         $nt = Title::newFromText( $parent );
3894                                         if ( $nt ) {
3895                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array( $parent => 1 ) );
3896                                         }
3897                                 }
3898                         }
3899                 }
3900
3901                 return $stack;
3902         }
3903
3904         /**
3905          * Get an associative array for selecting this title from
3906          * the "page" table
3907          *
3908          * @return Array suitable for the $where parameter of DB::select()
3909          */
3910         public function pageCond() {
3911                 if ( $this->mArticleID > 0 ) {
3912                         // PK avoids secondary lookups in InnoDB, shouldn't hurt other DBs
3913                         return array( 'page_id' => $this->mArticleID );
3914                 } else {
3915                         return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
3916                 }
3917         }
3918
3919         /**
3920          * Get the revision ID of the previous revision
3921          *
3922          * @param $revId Int Revision ID. Get the revision that was before this one.
3923          * @param $flags Int Title::GAID_FOR_UPDATE
3924          * @return Int|Bool Old revision ID, or FALSE if none exists
3925          */
3926         public function getPreviousRevisionID( $revId, $flags = 0 ) {
3927                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3928                 $revId = $db->selectField( 'revision', 'rev_id',
3929                         array(
3930                                 'rev_page' => $this->getArticleID( $flags ),
3931                                 'rev_id < ' . intval( $revId )
3932                         ),
3933                         __METHOD__,
3934                         array( 'ORDER BY' => 'rev_id DESC' )
3935                 );
3936
3937                 if ( $revId === false ) {
3938                         return false;
3939                 } else {
3940                         return intval( $revId );
3941                 }
3942         }
3943
3944         /**
3945          * Get the revision ID of the next revision
3946          *
3947          * @param $revId Int Revision ID. Get the revision that was after this one.
3948          * @param $flags Int Title::GAID_FOR_UPDATE
3949          * @return Int|Bool Next revision ID, or FALSE if none exists
3950          */
3951         public function getNextRevisionID( $revId, $flags = 0 ) {
3952                 $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3953                 $revId = $db->selectField( 'revision', 'rev_id',
3954                         array(
3955                                 'rev_page' => $this->getArticleID( $flags ),
3956                                 'rev_id > ' . intval( $revId )
3957                         ),
3958                         __METHOD__,
3959                         array( 'ORDER BY' => 'rev_id' )
3960                 );
3961
3962                 if ( $revId === false ) {
3963                         return false;
3964                 } else {
3965                         return intval( $revId );
3966                 }
3967         }
3968
3969         /**
3970          * Get the first revision of the page
3971          *
3972          * @param $flags Int Title::GAID_FOR_UPDATE
3973          * @return Revision|Null if page doesn't exist
3974          */
3975         public function getFirstRevision( $flags = 0 ) {
3976                 $pageId = $this->getArticleID( $flags );
3977                 if ( $pageId ) {
3978                         $db = ( $flags & self::GAID_FOR_UPDATE ) ? wfGetDB( DB_MASTER ) : wfGetDB( DB_SLAVE );
3979                         $row = $db->selectRow( 'revision', Revision::selectFields(),
3980                                 array( 'rev_page' => $pageId ),
3981                                 __METHOD__,
3982                                 array( 'ORDER BY' => 'rev_timestamp ASC', 'LIMIT' => 1 )
3983                         );
3984                         if ( $row ) {
3985                                 return new Revision( $row );
3986                         }
3987                 }
3988                 return null;
3989         }
3990
3991         /**
3992          * Get the oldest revision timestamp of this page
3993          *
3994          * @param $flags Int Title::GAID_FOR_UPDATE
3995          * @return String: MW timestamp
3996          */
3997         public function getEarliestRevTime( $flags = 0 ) {
3998                 $rev = $this->getFirstRevision( $flags );
3999                 return $rev ? $rev->getTimestamp() : null;
4000         }
4001
4002         /**
4003          * Check if this is a new page
4004          *
4005          * @return bool
4006          */
4007         public function isNewPage() {
4008                 $dbr = wfGetDB( DB_SLAVE );
4009                 return (bool)$dbr->selectField( 'page', 'page_is_new', $this->pageCond(), __METHOD__ );
4010         }
4011
4012         /**
4013          * Check whether the number of revisions of this page surpasses $wgDeleteRevisionsLimit
4014          *
4015          * @return bool
4016          */
4017         public function isBigDeletion() {
4018                 global $wgDeleteRevisionsLimit;
4019
4020                 if ( !$wgDeleteRevisionsLimit ) {
4021                         return false;
4022                 }
4023
4024                 $revCount = $this->estimateRevisionCount();
4025                 return $revCount > $wgDeleteRevisionsLimit;
4026         }
4027
4028         /**
4029          * Get the  approximate revision count of this page.
4030          *
4031          * @return int
4032          */
4033         public function estimateRevisionCount() {
4034                 if ( !$this->exists() ) {
4035                         return 0;
4036                 }
4037
4038                 if ( $this->mEstimateRevisions === null ) {
4039                         $dbr = wfGetDB( DB_SLAVE );
4040                         $this->mEstimateRevisions = $dbr->estimateRowCount( 'revision', '*',
4041                                 array( 'rev_page' => $this->getArticleID() ), __METHOD__ );
4042                 }
4043
4044                 return $this->mEstimateRevisions;
4045         }
4046
4047         /**
4048          * Get the number of revisions between the given revision.
4049          * Used for diffs and other things that really need it.
4050          *
4051          * @param $old int|Revision Old revision or rev ID (first before range)
4052          * @param $new int|Revision New revision or rev ID (first after range)
4053          * @return Int Number of revisions between these revisions.
4054          */
4055         public function countRevisionsBetween( $old, $new ) {
4056                 if ( !( $old instanceof Revision ) ) {
4057                         $old = Revision::newFromTitle( $this, (int)$old );
4058                 }
4059                 if ( !( $new instanceof Revision ) ) {
4060                         $new = Revision::newFromTitle( $this, (int)$new );
4061                 }
4062                 if ( !$old || !$new ) {
4063                         return 0; // nothing to compare
4064                 }
4065                 $dbr = wfGetDB( DB_SLAVE );
4066                 return (int)$dbr->selectField( 'revision', 'count(*)',
4067                         array(
4068                                 'rev_page' => $this->getArticleID(),
4069                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4070                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4071                         ),
4072                         __METHOD__
4073                 );
4074         }
4075
4076         /**
4077          * Get the number of authors between the given revision IDs.
4078          * Used for diffs and other things that really need it.
4079          *
4080          * @param $old int|Revision Old revision or rev ID (first before range)
4081          * @param $new int|Revision New revision or rev ID (first after range)
4082          * @param $limit Int Maximum number of authors
4083          * @return Int Number of revision authors between these revisions.
4084          */
4085         public function countAuthorsBetween( $old, $new, $limit ) {
4086                 if ( !( $old instanceof Revision ) ) {
4087                         $old = Revision::newFromTitle( $this, (int)$old );
4088                 }
4089                 if ( !( $new instanceof Revision ) ) {
4090                         $new = Revision::newFromTitle( $this, (int)$new );
4091                 }
4092                 if ( !$old || !$new ) {
4093                         return 0; // nothing to compare
4094                 }
4095                 $dbr = wfGetDB( DB_SLAVE );
4096                 $res = $dbr->select( 'revision', 'DISTINCT rev_user_text',
4097                         array(
4098                                 'rev_page' => $this->getArticleID(),
4099                                 'rev_timestamp > ' . $dbr->addQuotes( $dbr->timestamp( $old->getTimestamp() ) ),
4100                                 'rev_timestamp < ' . $dbr->addQuotes( $dbr->timestamp( $new->getTimestamp() ) )
4101                         ), __METHOD__,
4102                         array( 'LIMIT' => $limit + 1 ) // add one so caller knows it was truncated
4103                 );
4104                 return (int)$dbr->numRows( $res );
4105         }
4106
4107         /**
4108          * Compare with another title.
4109          *
4110          * @param $title Title
4111          * @return Bool
4112          */
4113         public function equals( Title $title ) {
4114                 // Note: === is necessary for proper matching of number-like titles.
4115                 return $this->getInterwiki() === $title->getInterwiki()
4116                         && $this->getNamespace() == $title->getNamespace()
4117                         && $this->getDBkey() === $title->getDBkey();
4118         }
4119
4120         /**
4121          * Check if this title is a subpage of another title
4122          *
4123          * @param $title Title
4124          * @return Bool
4125          */
4126         public function isSubpageOf( Title $title ) {
4127                 return $this->getInterwiki() === $title->getInterwiki()
4128                         && $this->getNamespace() == $title->getNamespace()
4129                         && strpos( $this->getDBkey(), $title->getDBkey() . '/' ) === 0;
4130         }
4131
4132         /**
4133          * Check if page exists.  For historical reasons, this function simply
4134          * checks for the existence of the title in the page table, and will
4135          * thus return false for interwiki links, special pages and the like.
4136          * If you want to know if a title can be meaningfully viewed, you should
4137          * probably call the isKnown() method instead.
4138          *
4139          * @return Bool
4140          */
4141         public function exists() {
4142                 return $this->getArticleID() != 0;
4143         }
4144
4145         /**
4146          * Should links to this title be shown as potentially viewable (i.e. as
4147          * "bluelinks"), even if there's no record by this title in the page
4148          * table?
4149          *
4150          * This function is semi-deprecated for public use, as well as somewhat
4151          * misleadingly named.  You probably just want to call isKnown(), which
4152          * calls this function internally.
4153          *
4154          * (ISSUE: Most of these checks are cheap, but the file existence check
4155          * can potentially be quite expensive.  Including it here fixes a lot of
4156          * existing code, but we might want to add an optional parameter to skip
4157          * it and any other expensive checks.)
4158          *
4159          * @return Bool
4160          */
4161         public function isAlwaysKnown() {
4162                 $isKnown = null;
4163
4164                 /**
4165                  * Allows overriding default behaviour for determining if a page exists.
4166                  * If $isKnown is kept as null, regular checks happen. If it's
4167                  * a boolean, this value is returned by the isKnown method.
4168                  *
4169                  * @since 1.20
4170                  *
4171                  * @param Title $title
4172                  * @param boolean|null $isKnown
4173                  */
4174                 wfRunHooks( 'TitleIsAlwaysKnown', array( $this, &$isKnown ) );
4175
4176                 if ( !is_null( $isKnown ) ) {
4177                         return $isKnown;
4178                 }
4179
4180                 if ( $this->mInterwiki != '' ) {
4181                         return true;  // any interwiki link might be viewable, for all we know
4182                 }
4183
4184                 switch( $this->mNamespace ) {
4185                         case NS_MEDIA:
4186                         case NS_FILE:
4187                                 // file exists, possibly in a foreign repo
4188                                 return (bool)wfFindFile( $this );
4189                         case NS_SPECIAL:
4190                                 // valid special page
4191                                 return SpecialPageFactory::exists( $this->getDBkey() );
4192                         case NS_MAIN:
4193                                 // selflink, possibly with fragment
4194                                 return $this->mDbkeyform == '';
4195                         case NS_MEDIAWIKI:
4196                                 // known system message
4197                                 return $this->hasSourceText() !== false;
4198                         default:
4199                                 return false;
4200                 }
4201         }
4202
4203         /**
4204          * Does this title refer to a page that can (or might) be meaningfully
4205          * viewed?  In particular, this function may be used to determine if
4206          * links to the title should be rendered as "bluelinks" (as opposed to
4207          * "redlinks" to non-existent pages).
4208          * Adding something else to this function will cause inconsistency
4209          * since LinkHolderArray calls isAlwaysKnown() and does its own
4210          * page existence check.
4211          *
4212          * @return Bool
4213          */
4214         public function isKnown() {
4215                 return $this->isAlwaysKnown() || $this->exists();
4216         }
4217
4218         /**
4219          * Does this page have source text?
4220          *
4221          * @return Boolean
4222          */
4223         public function hasSourceText() {
4224                 if ( $this->exists() ) {
4225                         return true;
4226                 }
4227
4228                 if ( $this->mNamespace == NS_MEDIAWIKI ) {
4229                         // If the page doesn't exist but is a known system message, default
4230                         // message content will be displayed, same for language subpages-
4231                         // Use always content language to avoid loading hundreds of languages
4232                         // to get the link color.
4233                         global $wgContLang;
4234                         list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4235                         $message = wfMessage( $name )->inLanguage( $wgContLang )->useDatabase( false );
4236                         return $message->exists();
4237                 }
4238
4239                 return false;
4240         }
4241
4242         /**
4243          * Get the default message text or false if the message doesn't exist
4244          *
4245          * @return String or false
4246          */
4247         public function getDefaultMessageText() {
4248                 global $wgContLang;
4249
4250                 if ( $this->getNamespace() != NS_MEDIAWIKI ) { // Just in case
4251                         return false;
4252                 }
4253
4254                 list( $name, $lang ) = MessageCache::singleton()->figureMessage( $wgContLang->lcfirst( $this->getText() ) );
4255                 $message = wfMessage( $name )->inLanguage( $lang )->useDatabase( false );
4256
4257                 if ( $message->exists() ) {
4258                         return $message->plain();
4259                 } else {
4260                         return false;
4261                 }
4262         }
4263
4264         /**
4265          * Updates page_touched for this page; called from LinksUpdate.php
4266          *
4267          * @return Bool true if the update succeded
4268          */
4269         public function invalidateCache() {
4270                 if ( wfReadOnly() ) {
4271                         return false;
4272                 }
4273                 $dbw = wfGetDB( DB_MASTER );
4274                 $success = $dbw->update(
4275                         'page',
4276                         array( 'page_touched' => $dbw->timestamp() ),
4277                         $this->pageCond(),
4278                         __METHOD__
4279                 );
4280                 HTMLFileCache::clearFileCache( $this );
4281                 return $success;
4282         }
4283
4284         /**
4285          * Update page_touched timestamps and send squid purge messages for
4286          * pages linking to this title. May be sent to the job queue depending
4287          * on the number of links. Typically called on create and delete.
4288          */
4289         public function touchLinks() {
4290                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
4291                 $u->doUpdate();
4292
4293                 if ( $this->getNamespace() == NS_CATEGORY ) {
4294                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
4295                         $u->doUpdate();
4296                 }
4297         }
4298
4299         /**
4300          * Get the last touched timestamp
4301          *
4302          * @param $db DatabaseBase: optional db
4303          * @return String last-touched timestamp
4304          */
4305         public function getTouched( $db = null ) {
4306                 $db = isset( $db ) ? $db : wfGetDB( DB_SLAVE );
4307                 $touched = $db->selectField( 'page', 'page_touched', $this->pageCond(), __METHOD__ );
4308                 return $touched;
4309         }
4310
4311         /**
4312          * Get the timestamp when this page was updated since the user last saw it.
4313          *
4314          * @param $user User
4315          * @return String|Null
4316          */
4317         public function getNotificationTimestamp( $user = null ) {
4318                 global $wgUser, $wgShowUpdatedMarker;
4319                 // Assume current user if none given
4320                 if ( !$user ) {
4321                         $user = $wgUser;
4322                 }
4323                 // Check cache first
4324                 $uid = $user->getId();
4325                 // avoid isset here, as it'll return false for null entries
4326                 if ( array_key_exists( $uid, $this->mNotificationTimestamp ) ) {
4327                         return $this->mNotificationTimestamp[$uid];
4328                 }
4329                 if ( !$uid || !$wgShowUpdatedMarker ) {
4330                         return $this->mNotificationTimestamp[$uid] = false;
4331                 }
4332                 // Don't cache too much!
4333                 if ( count( $this->mNotificationTimestamp ) >= self::CACHE_MAX ) {
4334                         $this->mNotificationTimestamp = array();
4335                 }
4336                 $dbr = wfGetDB( DB_SLAVE );
4337                 $this->mNotificationTimestamp[$uid] = $dbr->selectField( 'watchlist',
4338                         'wl_notificationtimestamp',
4339                         array(
4340                                 'wl_user' => $user->getId(),
4341                                 'wl_namespace' => $this->getNamespace(),
4342                                 'wl_title' => $this->getDBkey(),
4343                         ),
4344                         __METHOD__
4345                 );
4346                 return $this->mNotificationTimestamp[$uid];
4347         }
4348
4349         /**
4350          * Generate strings used for xml 'id' names in monobook tabs
4351          *
4352          * @param $prepend string defaults to 'nstab-'
4353          * @return String XML 'id' name
4354          */
4355         public function getNamespaceKey( $prepend = 'nstab-' ) {
4356                 global $wgContLang;
4357                 // Gets the subject namespace if this title
4358                 $namespace = MWNamespace::getSubject( $this->getNamespace() );
4359                 // Checks if cononical namespace name exists for namespace
4360                 if ( MWNamespace::exists( $this->getNamespace() ) ) {
4361                         // Uses canonical namespace name
4362                         $namespaceKey = MWNamespace::getCanonicalName( $namespace );
4363                 } else {
4364                         // Uses text of namespace
4365                         $namespaceKey = $this->getSubjectNsText();
4366                 }
4367                 // Makes namespace key lowercase
4368                 $namespaceKey = $wgContLang->lc( $namespaceKey );
4369                 // Uses main
4370                 if ( $namespaceKey == '' ) {
4371                         $namespaceKey = 'main';
4372                 }
4373                 // Changes file to image for backwards compatibility
4374                 if ( $namespaceKey == 'file' ) {
4375                         $namespaceKey = 'image';
4376                 }
4377                 return $prepend . $namespaceKey;
4378         }
4379
4380         /**
4381          * Get all extant redirects to this Title
4382          *
4383          * @param $ns Int|Null Single namespace to consider; NULL to consider all namespaces
4384          * @return Array of Title redirects to this title
4385          */
4386         public function getRedirectsHere( $ns = null ) {
4387                 $redirs = array();
4388
4389                 $dbr = wfGetDB( DB_SLAVE );
4390                 $where = array(
4391                         'rd_namespace' => $this->getNamespace(),
4392                         'rd_title' => $this->getDBkey(),
4393                         'rd_from = page_id'
4394                 );
4395                 if ( !is_null( $ns ) ) {
4396                         $where['page_namespace'] = $ns;
4397                 }
4398
4399                 $res = $dbr->select(
4400                         array( 'redirect', 'page' ),
4401                         array( 'page_namespace', 'page_title' ),
4402                         $where,
4403                         __METHOD__
4404                 );
4405
4406                 foreach ( $res as $row ) {
4407                         $redirs[] = self::newFromRow( $row );
4408                 }
4409                 return $redirs;
4410         }
4411
4412         /**
4413          * Check if this Title is a valid redirect target
4414          *
4415          * @return Bool
4416          */
4417         public function isValidRedirectTarget() {
4418                 global $wgInvalidRedirectTargets;
4419
4420                 // invalid redirect targets are stored in a global array, but explicity disallow Userlogout here
4421                 if ( $this->isSpecial( 'Userlogout' ) ) {
4422                         return false;
4423                 }
4424
4425                 foreach ( $wgInvalidRedirectTargets as $target ) {
4426                         if ( $this->isSpecial( $target ) ) {
4427                                 return false;
4428                         }
4429                 }
4430
4431                 return true;
4432         }
4433
4434         /**
4435          * Get a backlink cache object
4436          *
4437          * @return BacklinkCache
4438          */
4439         function getBacklinkCache() {
4440                 if ( is_null( $this->mBacklinkCache ) ) {
4441                         $this->mBacklinkCache = new BacklinkCache( $this );
4442                 }
4443                 return $this->mBacklinkCache;
4444         }
4445
4446         /**
4447          * Whether the magic words __INDEX__ and __NOINDEX__ function for  this page.
4448          *
4449          * @return Boolean
4450          */
4451         public function canUseNoindex() {
4452                 global $wgContentNamespaces, $wgExemptFromUserRobotsControl;
4453
4454                 $bannedNamespaces = is_null( $wgExemptFromUserRobotsControl )
4455                         ? $wgContentNamespaces
4456                         : $wgExemptFromUserRobotsControl;
4457
4458                 return !in_array( $this->mNamespace, $bannedNamespaces );
4459
4460         }
4461
4462         /**
4463          * Returns the raw sort key to be used for categories, with the specified
4464          * prefix.  This will be fed to Collation::getSortKey() to get a
4465          * binary sortkey that can be used for actual sorting.
4466          *
4467          * @param $prefix string The prefix to be used, specified using
4468          *   {{defaultsort:}} or like [[Category:Foo|prefix]].  Empty for no
4469          *   prefix.
4470          * @return string
4471          */
4472         public function getCategorySortkey( $prefix = '' ) {
4473                 $unprefixed = $this->getText();
4474
4475                 // Anything that uses this hook should only depend
4476                 // on the Title object passed in, and should probably
4477                 // tell the users to run updateCollations.php --force
4478                 // in order to re-sort existing category relations.
4479                 wfRunHooks( 'GetDefaultSortkey', array( $this, &$unprefixed ) );
4480                 if ( $prefix !== '' ) {
4481                         # Separate with a line feed, so the unprefixed part is only used as
4482                         # a tiebreaker when two pages have the exact same prefix.
4483                         # In UCA, tab is the only character that can sort above LF
4484                         # so we strip both of them from the original prefix.
4485                         $prefix = strtr( $prefix, "\n\t", '  ' );
4486                         return "$prefix\n$unprefixed";
4487                 }
4488                 return $unprefixed;
4489         }
4490
4491         /**
4492          * Get the language in which the content of this page is written.
4493          * Defaults to $wgContLang, but in certain cases it can be e.g.
4494          * $wgLang (such as special pages, which are in the user language).
4495          *
4496          * @since 1.18
4497          * @return Language
4498          */
4499         public function getPageLanguage() {
4500                 global $wgLang;
4501                 if ( $this->isSpecialPage() ) {
4502                         // special pages are in the user language
4503                         return $wgLang;
4504                 } elseif ( $this->isCssOrJsPage() || $this->isCssJsSubpage() ) {
4505                         // css/js should always be LTR and is, in fact, English
4506                         return wfGetLangObj( 'en' );
4507                 } elseif ( $this->getNamespace() == NS_MEDIAWIKI ) {
4508                         // Parse mediawiki messages with correct target language
4509                         list( /* $unused */, $lang ) = MessageCache::singleton()->figureMessage( $this->getText() );
4510                         return wfGetLangObj( $lang );
4511                 }
4512                 global $wgContLang;
4513                 // If nothing special, it should be in the wiki content language
4514                 $pageLang = $wgContLang;
4515                 // Hook at the end because we don't want to override the above stuff
4516                 wfRunHooks( 'PageContentLanguage', array( $this, &$pageLang, $wgLang ) );
4517                 return wfGetLangObj( $pageLang );
4518         }
4519 }