includes/Revision.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @todo document
   5  */
   6
   7 /** */
   8 require_once( 'Database.php' );
   9
  10 /**
  11  * @package MediaWiki
  12  * @todo document
  13  */
  14 class Revision {
  15         const MW_REV_DELETED_TEXT       = 1;
  16         const MW_REV_DELETED_COMMENT    = 2;
  17         const MW_REV_DELETED_USER       = 4;
  18         const MW_REV_DELETED_RESTRICTED = 8;
  19
  20         /**
  21          * Load a page revision from a given revision ID number.
  22          * Returns null if no such revision can be found.
  23          *
  24          * @param int $id
  25          * @static
  26          * @access public
  27          */
  28         function newFromId( $id ) {
  29                 return Revision::newFromConds(
  30                         array( 'page_id=rev_page',
  31                                'rev_id' => intval( $id ) ) );
  32         }
  33
  34         /**
  35          * Load either the current, or a specified, revision
  36          * that's attached to a given title. If not attached
  37          * to that title, will return null.
  38          *
  39          * @param Title $title
  40          * @param int $id
  41          * @return Revision
  42          * @access public
  43          * @static
  44          */
  45         function newFromTitle( &$title, $id = 0 ) {
  46                 if( $id ) {
  47                         $matchId = intval( $id );
  48                 } else {
  49                         $matchId = 'page_latest';
  50                 }
  51                 return Revision::newFromConds(
  52                         array( "rev_id=$matchId",
  53                                'page_id=rev_page',
  54                                'page_namespace' => $title->getNamespace(),
  55                                'page_title'     => $title->getDbkey() ) );
  56         }
  57
  58         /**
  59          * Load either the current, or a specified, revision
  60          * that's attached to a given page. If not attached
  61          * to that page, will return null.
  62          *
  63          * @param Database $db
  64          * @param int $pageid
  65          * @param int $id
  66          * @return Revision
  67          * @access public
  68          */
  69         function loadFromPageId( &$db, $pageid, $id = 0 ) {
  70                 $conds=array('page_id=rev_page','rev_page'=>intval( $pageid ), 'page_id'=>intval( $pageid ));
  71                 if( $id ) {
  72                         $conds['rev_id']=intval($id);
  73                 } else {
  74                         $conds[]='rev_id=page_latest';
  75                 }
  76                 return Revision::loadFromConds( $db, $conds );
  77         }
  78
  79         /**
  80          * Load either the current, or a specified, revision
  81          * that's attached to a given page. If not attached
  82          * to that page, will return null.
  83          *
  84          * @param Database $db
  85          * @param Title $title
  86          * @param int $id
  87          * @return Revision
  88          * @access public
  89          */
  90         function loadFromTitle( &$db, $title, $id = 0 ) {
  91                 if( $id ) {
  92                         $matchId = intval( $id );
  93                 } else {
  94                         $matchId = 'page_latest';
  95                 }
  96                 return Revision::loadFromConds(
  97                         $db,
  98                         array( "rev_id=$matchId",
  99                                'page_id=rev_page',
 100                                'page_namespace' => $title->getNamespace(),
 101                                'page_title'     => $title->getDbkey() ) );
 102         }
 103
 104         /**
 105          * Load the revision for the given title with the given timestamp.
 106          * WARNING: Timestamps may in some circumstances not be unique,
 107          * so this isn't the best key to use.
 108          *
 109          * @param Database $db
 110          * @param Title $title
 111          * @param string $timestamp
 112          * @return Revision
 113          * @access public
 114          * @static
 115          */
 116         function loadFromTimestamp( &$db, &$title, $timestamp ) {
 117                 return Revision::loadFromConds(
 118                         $db,
 119                         array( 'rev_timestamp'  => $db->timestamp( $timestamp ),
 120                                'page_id=rev_page',
 121                                'page_namespace' => $title->getNamespace(),
 122                                'page_title'     => $title->getDbkey() ) );
 123         }
 124
 125         /**
 126          * Given a set of conditions, fetch a revision.
 127          *
 128          * @param array $conditions
 129          * @return Revision
 130          * @static
 131          * @access private
 132          */
 133         function newFromConds( $conditions ) {
 134                 $db =& wfGetDB( DB_SLAVE );
 135                 $row = Revision::loadFromConds( $db, $conditions );
 136                 if( is_null( $row ) ) {
 137                         $dbw =& wfGetDB( DB_MASTER );
 138                         $row = Revision::loadFromConds( $dbw, $conditions );
 139                 }
 140                 return $row;
 141         }
 142
 143         /**
 144          * Given a set of conditions, fetch a revision from
 145          * the given database connection.
 146          *
 147          * @param Database $db
 148          * @param array $conditions
 149          * @return Revision
 150          * @static
 151          * @access private
 152          */
 153         function loadFromConds( &$db, $conditions ) {
 154                 $res = Revision::fetchFromConds( $db, $conditions );
 155                 if( $res ) {
 156                         $row = $res->fetchObject();
 157                         $res->free();
 158                         if( $row ) {
 159                                 $ret = new Revision( $row );
 160                                 return $ret;
 161                         }
 162                 }
 163                 $ret = null;
 164                 return $ret;
 165         }
 166
 167         /**
 168          * Return a wrapper for a series of database rows to
 169          * fetch all of a given page's revisions in turn.
 170          * Each row can be fed to the constructor to get objects.
 171          *
 172          * @param Title $title
 173          * @return ResultWrapper
 174          * @static
 175          * @access public
 176          */
 177         function fetchAllRevisions( &$title ) {
 178                 return Revision::fetchFromConds(
 179                         wfGetDB( DB_SLAVE ),
 180                         array( 'page_namespace' => $title->getNamespace(),
 181                                'page_title'     => $title->getDbkey(),
 182                                'page_id=rev_page' ) );
 183         }
 184
 185         /**
 186          * Return a wrapper for a series of database rows to
 187          * fetch all of a given page's revisions in turn.
 188          * Each row can be fed to the constructor to get objects.
 189          *
 190          * @param Title $title
 191          * @return ResultWrapper
 192          * @static
 193          * @access public
 194          */
 195         function fetchRevision( &$title ) {
 196                 return Revision::fetchFromConds(
 197                         wfGetDB( DB_SLAVE ),
 198                         array( 'rev_id=page_latest',
 199                                'page_namespace' => $title->getNamespace(),
 200                                'page_title'     => $title->getDbkey(),
 201                                'page_id=rev_page' ) );
 202         }
 203
 204         /**
 205          * Given a set of conditions, return a ResultWrapper
 206          * which will return matching database rows with the
 207          * fields necessary to build Revision objects.
 208          *
 209          * @param Database $db
 210          * @param array $conditions
 211          * @return ResultWrapper
 212          * @static
 213          * @access private
 214          */
 215         function fetchFromConds( &$db, $conditions ) {
 216                 $res = $db->select(
 217                         array( 'page', 'revision' ),
 218                         array( 'page_namespace',
 219                                'page_title',
 220                                'page_latest',
 221                                'rev_id',
 222                                'rev_page',
 223                                'rev_text_id',
 224                                'rev_comment',
 225                                'rev_user_text',
 226                                'rev_user',
 227                                'rev_minor_edit',
 228                                'rev_timestamp',
 229                                'rev_deleted' ),
 230                         $conditions,
 231                         'Revision::fetchRow',
 232                         array( 'LIMIT' => 1 ) );
 233                 $ret = $db->resultObject( $res );
 234                 return $ret;
 235         }
 236
 237         /**
 238          * @param object $row
 239          * @access private
 240          */
 241         function Revision( $row ) {
 242                 if( is_object( $row ) ) {
 243                         $this->mId        = intval( $row->rev_id );
 244                         $this->mPage      = intval( $row->rev_page );
 245                         $this->mTextId    = intval( $row->rev_text_id );
 246                         $this->mComment   =         $row->rev_comment;
 247                         $this->mUserText  =         $row->rev_user_text;
 248                         $this->mUser      = intval( $row->rev_user );
 249                         $this->mMinorEdit = intval( $row->rev_minor_edit );
 250                         $this->mTimestamp =         $row->rev_timestamp;
 251                         $this->mDeleted   = intval( $row->rev_deleted );
 252
 253                         if( isset( $row->page_latest ) ) {
 254                                 $this->mCurrent   = ( $row->rev_id == $row->page_latest );
 255                                 $this->mTitle     = Title::makeTitle( $row->page_namespace,
 256                                                                       $row->page_title );
 257                         } else {
 258                                 $this->mCurrent = false;
 259                                 $this->mTitle = null;
 260                         }
 261
 262                         if( isset( $row->old_text ) ) {
 263                                 $this->mText  = $this->getRevisionText( $row );
 264                         } else {
 265                                 $this->mText  = null;
 266                         }
 267                 } elseif( is_array( $row ) ) {
 268                         // Build a new revision to be saved...
 269                         global $wgUser;
 270
 271                         $this->mId        = isset( $row['id']         ) ? intval( $row['id']         ) : null;
 272                         $this->mPage      = isset( $row['page']       ) ? intval( $row['page']       ) : null;
 273                         $this->mTextId    = isset( $row['text_id']    ) ? intval( $row['text_id']    ) : null;
 274                         $this->mUserText  = isset( $row['user_text']  ) ? strval( $row['user_text']  ) : $wgUser->getName();
 275                         $this->mUser      = isset( $row['user']       ) ? intval( $row['user']       ) : $wgUser->getId();
 276                         $this->mMinorEdit = isset( $row['minor_edit'] ) ? intval( $row['minor_edit'] ) : 0;
 277                         $this->mTimestamp = isset( $row['timestamp']  ) ? strval( $row['timestamp']  ) : wfTimestamp( TS_MW );
 278                         $this->mDeleted   = isset( $row['deleted']    ) ? intval( $row['deleted']    ) : 0;
 279
 280                         // Enforce spacing trimming on supplied text
 281                         $this->mComment   = isset( $row['comment']    ) ?  trim( strval( $row['comment'] ) ) : null;
 282                         $this->mText      = isset( $row['text']       ) ? rtrim( strval( $row['text']    ) ) : null;
 283
 284                         $this->mTitle     = null; # Load on demand if needed
 285                         $this->mCurrent   = false;
 286                 } else {
 287                         throw new MWException( 'Revision constructor passed invalid row format.' );
 288                 }
 289         }
 290
 291         /**#@+
 292          * @access public
 293          */
 294
 295         /**
 296          * @return int
 297          */
 298         function getId() {
 299                 return $this->mId;
 300         }
 301
 302         /**
 303          * @return int
 304          */
 305         function getTextId() {
 306                 return $this->mTextId;
 307         }
 308
 309         /**
 310          * Returns the title of the page associated with this entry.
 311          * @return Title
 312          */
 313         function getTitle() {
 314                 if( isset( $this->mTitle ) ) {
 315                         return $this->mTitle;
 316                 }
 317                 $dbr =& wfGetDB( DB_SLAVE );
 318                 $row = $dbr->selectRow(
 319                         array( 'page', 'revision' ),
 320                         array( 'page_namespace', 'page_title' ),
 321                         array( 'page_id=rev_page',
 322                                'rev_id' => $this->mId ),
 323                         'Revision::getTitle' );
 324                 if( $row ) {
 325                         $this->mTitle = Title::makeTitle( $row->page_namespace,
 326                                                            $row->page_title );
 327                 }
 328                 return $this->mTitle;
 329         }
 330
 331         /**
 332          * Set the title of the revision
 333          * @param Title $title
 334          */
 335         function setTitle( $title ) {
 336                 $this->mTitle = $title;
 337         }
 338
 339         /**
 340          * @return int
 341          */
 342         function getPage() {
 343                 return $this->mPage;
 344         }
 345
 346         /**
 347          * Fetch revision's user id if it's available to all users
 348          * @return int
 349          */
 350         function getUser() {
 351                 if( $this->isDeleted( self::MW_REV_DELETED_USER ) ) {
 352                         return 0;
 353                 } else {
 354                         return $this->mUser;
 355                 }
 356         }
 357
 358         /**
 359          * Fetch revision's user id without regard for the current user's permissions
 360          * @return string
 361          */
 362         function getRawUser() {
 363                 return $this->mUser;
 364         }
 365
 366         /**
 367          * Fetch revision's username if it's available to all users
 368          * @return string
 369          */
 370         function getUserText() {
 371                 if( $this->isDeleted( self::MW_REV_DELETED_USER ) ) {
 372                         return "";
 373                 } else {
 374                         return $this->mUserText;
 375                 }
 376         }
 377
 378         /**
 379          * Fetch revision's username without regard for view restrictions
 380          * @return string
 381          */
 382         function getRawUserText() {
 383                 return $this->mUserText;
 384         }
 385
 386         /**
 387          * Fetch revision comment if it's available to all users
 388          * @return string
 389          */
 390         function getComment() {
 391                 if( $this->isDeleted( self::MW_REV_DELETED_COMMENT ) ) {
 392                         return "";
 393                 } else {
 394                         return $this->mComment;
 395                 }
 396         }
 397
 398         /**
 399          * Fetch revision comment without regard for the current user's permissions
 400          * @return string
 401          */
 402         function getRawComment() {
 403                 return $this->mComment;
 404         }
 405
 406         /**
 407          * @return bool
 408          */
 409         function isMinor() {
 410                 return (bool)$this->mMinorEdit;
 411         }
 412
 413         /**
 414          * int $field one of MW_REV_DELETED_* bitfield constants
 415          * @return bool
 416          */
 417         function isDeleted( $field ) {
 418                 return ($this->mDeleted & $field) == $field;
 419         }
 420
 421         /**
 422          * Fetch revision text if it's available to all users
 423          * @return string
 424          */
 425         function getText() {
 426                 if( $this->isDeleted( self::MW_REV_DELETED_TEXT ) ) {
 427                         return "";
 428                 } else {
 429                         return $this->getRawText();
 430                 }
 431         }
 432
 433         /**
 434          * Fetch revision text without regard for view restrictions
 435          * @return string
 436          */
 437         function getRawText() {
 438                 if( is_null( $this->mText ) ) {
 439                         // Revision text is immutable. Load on demand:
 440                         $this->mText = $this->loadText();
 441                 }
 442                 return $this->mText;
 443         }
 444
 445         /**
 446          * @return string
 447          */
 448         function getTimestamp() {
 449                 return wfTimestamp(TS_MW, $this->mTimestamp);
 450         }
 451
 452         /**
 453          * @return bool
 454          */
 455         function isCurrent() {
 456                 return $this->mCurrent;
 457         }
 458
 459         /**
 460          * @return Revision
 461          */
 462         function getPrevious() {
 463                 $prev = $this->mTitle->getPreviousRevisionID( $this->mId );
 464                 if ( $prev ) {
 465                         return Revision::newFromTitle( $this->mTitle, $prev );
 466                 } else {
 467                         return null;
 468                 }
 469         }
 470
 471         /**
 472          * @return Revision
 473          */
 474         function getNext() {
 475                 $next = $this->mTitle->getNextRevisionID( $this->mId );
 476                 if ( $next ) {
 477                         return Revision::newFromTitle( $this->mTitle, $next );
 478                 } else {
 479                         return null;
 480                 }
 481         }
 482         /**#@-*/
 483
 484         /**
 485           * Get revision text associated with an old or archive row
 486           * $row is usually an object from wfFetchRow(), both the flags and the text
 487           * field must be included
 488           * @static
 489           * @param integer $row Id of a row
 490           * @param string $prefix table prefix (default 'old_')
 491           * @return string $text|false the text requested
 492           */
 493         function getRevisionText( $row, $prefix = 'old_' ) {
 494                 $fname = 'Revision::getRevisionText';
 495                 wfProfileIn( $fname );
 496
 497                 # Get data
 498                 $textField = $prefix . 'text';
 499                 $flagsField = $prefix . 'flags';
 500
 501                 if( isset( $row->$flagsField ) ) {
 502                         $flags = explode( ',', $row->$flagsField );
 503                 } else {
 504                         $flags = array();
 505                 }
 506
 507                 if( isset( $row->$textField ) ) {
 508                         $text = $row->$textField;
 509                 } else {
 510                         wfProfileOut( $fname );
 511                         return false;
 512                 }
 513
 514                 # Use external methods for external objects, text in table is URL-only then
 515                 if ( in_array( 'external', $flags ) ) {
 516                         $url=$text;
 517                         @list($proto,$path)=explode('://',$url,2);
 518                         if ($path=="") {
 519                                 wfProfileOut( $fname );
 520                                 return false;
 521                         }
 522                         require_once('ExternalStore.php');
 523                         $text=ExternalStore::fetchFromURL($url);
 524                 }
 525
 526                 // If the text was fetched without an error, convert it
 527                 if ( $text !== false ) {
 528                         if( in_array( 'gzip', $flags ) ) {
 529                                 # Deal with optional compression of archived pages.
 530                                 # This can be done periodically via maintenance/compressOld.php, and
 531                                 # as pages are saved if $wgCompressRevisions is set.
 532                                 $text = gzinflate( $text );
 533                         }
 534
 535                         if( in_array( 'object', $flags ) ) {
 536                                 # Generic compressed storage
 537                                 $obj = unserialize( $text );
 538                                 if ( !is_object( $obj ) ) {
 539                                         // Invalid object
 540                                         wfProfileOut( $fname );
 541                                         return false;
 542                                 }
 543                                 $text = $obj->getText();
 544                         }
 545
 546                         global $wgLegacyEncoding;
 547                         if( $wgLegacyEncoding && !in_array( 'utf-8', $flags ) ) {
 548                                 # Old revisions kept around in a legacy encoding?
 549                                 # Upconvert on demand.
 550                                 global $wgInputEncoding, $wgContLang;
 551                                 $text = $wgContLang->iconv( $wgLegacyEncoding, $wgInputEncoding . '//IGNORE', $text );
 552                         }
 553                 }
 554                 wfProfileOut( $fname );
 555                 return $text;
 556         }
 557
 558         /**
 559          * If $wgCompressRevisions is enabled, we will compress data.
 560          * The input string is modified in place.
 561          * Return value is the flags field: contains 'gzip' if the
 562          * data is compressed, and 'utf-8' if we're saving in UTF-8
 563          * mode.
 564          *
 565          * @static
 566          * @param mixed $text reference to a text
 567          * @return string
 568          */
 569         function compressRevisionText( &$text ) {
 570                 global $wgCompressRevisions;
 571                 $flags = array();
 572
 573                 # Revisions not marked this way will be converted
 574                 # on load if $wgLegacyCharset is set in the future.
 575                 $flags[] = 'utf-8';
 576
 577                 if( $wgCompressRevisions ) {
 578                         if( function_exists( 'gzdeflate' ) ) {
 579                                 $text = gzdeflate( $text );
 580                                 $flags[] = 'gzip';
 581                         } else {
 582                                 wfDebug( "Revision::compressRevisionText() -- no zlib support, not compressing\n" );
 583                         }
 584                 }
 585                 return implode( ',', $flags );
 586         }
 587
 588         /**
 589          * Insert a new revision into the database, returning the new revision ID
 590          * number on success and dies horribly on failure.
 591          *
 592          * @param Database $dbw
 593          * @return int
 594          */
 595         function insertOn( &$dbw ) {
 596                 global $wgDefaultExternalStore;
 597
 598                 $fname = 'Revision::insertOn';
 599                 wfProfileIn( $fname );
 600
 601                 $data = $this->mText;
 602                 $flags = Revision::compressRevisionText( $data );
 603
 604                 # Write to external storage if required
 605                 if ( $wgDefaultExternalStore ) {
 606                         if ( is_array( $wgDefaultExternalStore ) ) {
 607                                 // Distribute storage across multiple clusters
 608                                 $store = $wgDefaultExternalStore[mt_rand(0, count( $wgDefaultExternalStore ) - 1)];
 609                         } else {
 610                                 $store = $wgDefaultExternalStore;
 611                         }
 612                         require_once('ExternalStore.php');
 613                         // Store and get the URL
 614                         $data = ExternalStore::insert( $store, $data );
 615                         if ( !$data ) {
 616                                 # This should only happen in the case of a configuration error, where the external store is not valid
 617                                 throw new MWException( "Unable to store text to external storage $store" );
 618                         }
 619                         if ( $flags ) {
 620                                 $flags .= ',';
 621                         }
 622                         $flags .= 'external';
 623                 }
 624
 625                 # Record the text (or external storage URL) to the text table
 626                 if( !isset( $this->mTextId ) ) {
 627                         $old_id = $dbw->nextSequenceValue( 'text_old_id_val' );
 628                         $dbw->insert( 'text',
 629                                 array(
 630                                         'old_id'    => $old_id,
 631                                         'old_text'  => $data,
 632                                         'old_flags' => $flags,
 633                                 ), $fname
 634                         );
 635                         $this->mTextId = $dbw->insertId();
 636                 }
 637
 638                 # Record the edit in revisions
 639                 $rev_id = isset( $this->mId )
 640                         ? $this->mId
 641                         : $dbw->nextSequenceValue( 'rev_rev_id_val' );
 642                 $dbw->insert( 'revision',
 643                         array(
 644                                 'rev_id'         => $rev_id,
 645                                 'rev_page'       => $this->mPage,
 646                                 'rev_text_id'    => $this->mTextId,
 647                                 'rev_comment'    => $this->mComment,
 648                                 'rev_minor_edit' => $this->mMinorEdit ? 1 : 0,
 649                                 'rev_user'       => $this->mUser,
 650                                 'rev_user_text'  => $this->mUserText,
 651                                 'rev_timestamp'  => $dbw->timestamp( $this->mTimestamp ),
 652                                 'rev_deleted'    => $this->mDeleted,
 653                         ), $fname
 654                 );
 655
 656                 $this->mId = !is_null($rev_id) ? $rev_id : $dbw->insertId();
 657                 wfProfileOut( $fname );
 658                 return $this->mId;
 659         }
 660
 661         /**
 662          * Lazy-load the revision's text.
 663          * Currently hardcoded to the 'text' table storage engine.
 664          *
 665          * @return string
 666          * @access private
 667          */
 668         function loadText() {
 669                 $fname = 'Revision::loadText';
 670                 wfProfileIn( $fname );
 671
 672                 $dbr =& wfGetDB( DB_SLAVE );
 673                 $row = $dbr->selectRow( 'text',
 674                         array( 'old_text', 'old_flags' ),
 675                         array( 'old_id' => $this->getTextId() ),
 676                         $fname);
 677
 678                 if( !$row ) {
 679                         $dbw =& wfGetDB( DB_MASTER );
 680                         $row = $dbw->selectRow( 'text',
 681                                 array( 'old_text', 'old_flags' ),
 682                                 array( 'old_id' => $this->getTextId() ),
 683                                 $fname);
 684                 }
 685
 686                 $text = Revision::getRevisionText( $row );
 687                 wfProfileOut( $fname );
 688
 689                 return $text;
 690         }
 691
 692         /**
 693          * Create a new null-revision for insertion into a page's
 694          * history. This will not re-save the text, but simply refer
 695          * to the text from the previous version.
 696          *
 697          * Such revisions can for instance identify page rename
 698          * operations and other such meta-modifications.
 699          *
 700          * @param Database $dbw
 701          * @param int      $pageId ID number of the page to read from
 702          * @param string   $summary
 703          * @param bool     $minor
 704          * @return Revision
 705          */
 706         function newNullRevision( &$dbw, $pageId, $summary, $minor ) {
 707                 $fname = 'Revision::newNullRevision';
 708                 wfProfileIn( $fname );
 709
 710                 $current = $dbw->selectRow(
 711                         array( 'page', 'revision' ),
 712                         array( 'page_latest', 'rev_text_id' ),
 713                         array(
 714                                 'page_id' => $pageId,
 715                                 'page_latest=rev_id',
 716                                 ),
 717                         $fname );
 718
 719                 if( $current ) {
 720                         $revision = new Revision( array(
 721                                 'page'       => $pageId,
 722                                 'comment'    => $summary,
 723                                 'minor_edit' => $minor,
 724                                 'text_id'    => $current->rev_text_id,
 725                                 ) );
 726                 } else {
 727                         $revision = null;
 728                 }
 729
 730                 wfProfileOut( $fname );
 731                 return $revision;
 732         }
 733
 734         /**
 735          * Determine if the current user is allowed to view a particular
 736          * field of this revision, if it's marked as deleted.
 737          * @param int $field one of self::MW_REV_DELETED_TEXT,
 738          *                          self::MW_REV_DELETED_COMMENT,
 739          *                          self::MW_REV_DELETED_USER
 740          * @return bool
 741          */
 742         function userCan( $field ) {
 743                 if( ( $this->mDeleted & $field ) == $field ) {
 744                         global $wgUser;
 745                         $permission = ( $this->mDeleted & self::MW_REV_DELETED_RESTRICTED ) == self::MW_REV_DELETED_RESTRICTED
 746                                 ? 'hiderevision'
 747                                 : 'deleterevision';
 748                         wfDebug( "Checking for $permission due to $field match on $this->mDeleted\n" );
 749                         return $wgUser->isAllowed( $permission );
 750                 } else {
 751                         return true;
 752                 }
 753         }
 754
 755 }
 756
 757 ?>