includes/title/NaiveImportTitleFactory.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 use MediaWiki\MediaWikiServices;
  22
  23 /**
  24  * A class to convert page titles on a foreign wiki (ForeignTitle objects) into
  25  * page titles on the local wiki (Title objects), using a default namespace
  26  * mapping.
  27  *
  28  * For built-in namespaces (0 <= ID < 100), we try to find a local namespace
  29  * with the same namespace ID as the foreign page. If no such namespace exists,
  30  * or the namespace ID is unknown or > 100, we look for a local namespace with
  31  * a matching namespace name. If that can't be found, we dump the page in the
  32  * main namespace as a last resort.
  33  */
  34 class NaiveImportTitleFactory implements ImportTitleFactory {
  35         /**
  36          * Determines which local title best corresponds to the given foreign title.
  37          * If such a title can't be found or would be locally invalid, null is
  38          * returned.
  39          *
  40          * @param ForeignTitle $foreignTitle The ForeignTitle to convert
  41          * @return Title|null
  42          */
  43         public function createTitleFromForeignTitle( ForeignTitle $foreignTitle ) {
  44                 if ( $foreignTitle->isNamespaceIdKnown() ) {
  45                         $foreignNs = $foreignTitle->getNamespaceId();
  46
  47                         // For built-in namespaces (0 <= ID < 100), we try to find a local NS with
  48                         // the same namespace ID
  49                         if (
  50                                 $foreignNs < 100 &&
  51                                 MediaWikiServices::getInstance()->getNamespaceInfo()->exists( $foreignNs )
  52                         ) {
  53                                 return Title::makeTitleSafe( $foreignNs, $foreignTitle->getText() );
  54                         }
  55                 }
  56
  57                 // Do we have a local namespace by the same name as the foreign
  58                 // namespace?
  59                 $targetNs = MediaWikiServices::getInstance()->getContentLanguage()->getNsIndex(
  60                         $foreignTitle->getNamespaceName() );
  61                 if ( $targetNs !== false ) {
  62                         return Title::makeTitleSafe( $targetNs, $foreignTitle->getText() );
  63                 }
  64
  65                 // Otherwise, just fall back to main namespace
  66                 return Title::makeTitleSafe( 0, $foreignTitle->getFullText() );
  67         }
  68 }