Index: includes/api/ApiMain.php
===================================================================
--- includes/api/ApiMain.php	(revision 75473)
+++ includes/api/ApiMain.php	(working copy)
@@ -63,6 +63,7 @@
 		'feedwatchlist' => 'ApiFeedWatchlist',
 		'help' => 'ApiHelp',
 		'paraminfo' => 'ApiParamInfo',
+		'rsd' => 'ApiRsd',
 
 		// Write modules
 		'purge' => 'ApiPurge',
Index: includes/api/ApiRsd.php
===================================================================
--- includes/api/ApiRsd.php	(revision 0)
+++ includes/api/ApiRsd.php	(revision 0)
@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * API for MediaWiki 1.17+
+ *
+ * Created on October 26, 2010
+ *
+ * Copyright © 2010 Bryan Tong Minh and Brion Vibber
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+if ( !defined( 'MEDIAWIKI' ) ) {
+	require_once( 'ApiBase.php' );
+}
+
+/**
+ * API interface for page purging
+ * @ingroup API
+ */
+class ApiRsd extends ApiBase {
+
+	public function __construct( $main, $action ) {
+		parent::__construct( $main, $action );
+	}
+
+	public function execute() {
+		$result = $this->getResult();
+		
+
+		$result->addValue( null, 'version', '1.0' );
+		$result->addValue( null, 'xmlns', 'http://archipelago.phrasewise.com/rsd' );
+
+		$service = array(
+			 'engineName' => array(
+				 '*' => 'MediaWiki'
+			 ),
+			 'engineLink' => array(
+				 '*' => 'http://www.mediawiki.org/'
+			 ),
+			 'apis' => $this->formatRsdApiList()
+		);
+
+		$result->setIndexedTagName( $service['apis'], 'api' );
+
+		$result->addValue( null, 'service', $service );
+	}
+
+	public function getCustomPrinter() {
+		$printer = $this->getMain()->createPrinterByName( 'xml' );
+		$printer->setRootElement( 'rsd' );
+		return $printer;
+	}
+
+	public function getAllowedParams() {
+		return array();
+	}
+
+	public function getParamDescription() {
+		return array();
+	}
+
+	public function getDescription() {
+		return 'Export an RSD schema';
+	}
+
+	protected function getExamples() {
+		return array(
+			'api.php?action=rsd'
+		);
+	}
+
+	/**
+	 * Builds an internal list of APIs to expose information about.
+	 * Normally this only lists the MediaWiki API, with its base URL,
+	 * link to documentation, and a marker as to available authentication
+	 * (to aid in OAuth client apps switching to support in the future).
+	 *
+	 * Extensions can expose other APIs, such as WordPress or Twitter-
+	 * compatible APIs, by hooking 'ApiRsdServiceApis' and adding more
+	 * elements to the array.
+	 *
+	 * See http://cyber.law.harvard.edu/blogs/gems/tech/rsd.html for
+	 * the base RSD spec, and check WordPress and StatusNet sites for
+	 * in-production examples listing several blogging and micrblogging
+	 * APIs.
+	 *
+	 * @return array
+	 */
+	protected function getRsdApiList()
+	{
+		$apis = array(
+			'MediaWiki' => array(
+				// The API link is required for all RSD API entries.
+				'apiLink' => wfExpandUrl( wfScript( 'api' ) ),
+
+				// Docs link is optional, but recommended.
+				'docs' => 'http://mediawiki.org/wiki/API',
+
+				// Some APIs may need a blog ID, but it may be left blank.
+				'blogID' => '',
+
+				// Additional settings are optional.
+				'settings' => array(
+					// Change this to true in the future as an aid to
+					// machine discovery of OAuth for API access.
+					'OAuth' => false,
+				)
+			),
+		);
+		wfRunHooks( 'ApiRsdServiceApis', array( &$apis ) );
+		return $apis;
+	}
+
+	/**
+	 * Formats the internal list of exposed APIs into an array suitable
+	 * to pass to the API's XML formatter.
+	 *
+	 * @return array
+	 */
+	protected function formatRsdApiList()
+	{
+		$apis = $this->getRsdApiList();
+
+		$outputData = array();
+		foreach ($apis as $name => $info) {
+			$data = array(
+				'name' => $name,
+				'preferred' => wfBoolToStr( $name == 'MediaWiki' ),
+				'apiLink' => $info['apiLink'],
+				'blogID' => isset( $info['blogID'] ) ? $info['blogID'] : ''
+			);
+			if( isset( $info['docs'] ) ) {
+				$data['settings']['docs'] = array(
+					'*' => $info['docs'],
+				);
+			}
+			if( isset( $info['settings'] ) ) {
+				foreach( $info['settings'] as $setting => $val ) {
+					if( is_bool( $val ) ) {
+						$xmlVal = wfBoolToStr( $val );
+					} else {
+						$xmlVal = $val;
+					}
+					$data['settings'][] = array(
+						'name' => $setting,
+						'*' => $xmlVal,
+					);
+				}
+			}
+			if( isset( $data['settings'] ) ) {
+				$data['settings']['_element'] = 'setting';
+			}
+			$outputData[] = $data;
+		}
+		return $outputData;
+	}
+	public function getVersion() {
+		return __CLASS__ . ': $Id$';
+	}
+}

Property changes on: includes/api/ApiRsd.php
___________________________________________________________________
Added: svn:eol-style
   + native

Index: includes/AutoLoader.php
===================================================================
--- includes/AutoLoader.php	(revision 75473)
+++ includes/AutoLoader.php	(working copy)
@@ -297,6 +297,7 @@
 	'ApiPatrol' => 'includes/api/ApiPatrol.php',
 	'ApiProtect' => 'includes/api/ApiProtect.php',
 	'ApiPurge' => 'includes/api/ApiPurge.php',
+	'ApiRsd' => 'includes/api/ApiRsd.php',
 	'ApiQuery' => 'includes/api/ApiQuery.php',
 	'ApiQueryAllCategories' => 'includes/api/ApiQueryAllCategories.php',
 	'ApiQueryAllimages' => 'includes/api/ApiQueryAllimages.php',
Index: includes/Skin.php
===================================================================
--- includes/Skin.php	(revision 75473)
+++ includes/Skin.php	(working copy)
@@ -216,6 +216,16 @@
 			'title' => wfMsgForContent( 'opensearch-desc' ),
 		) );
 
+		# Real Simple Discovery link, provides auto-discovery information
+		# for the MediaWiki API (and potentially additional custom API
+		# support such as WordPress or Twitter-compatible APIs for a
+		# blogging extension, etc)
+		$out->addLink( array(
+			'rel' => 'EditURI',
+			'type' => 'application/rsd+xml',
+			'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ) ),
+		) );
+
 		$this->addMetadataLinks( $out );
 
 		$this->mRevisionId = $out->mRevisionId;