Index: wp-includes/class-wp-xmlrpc-server.php
===================================================================
--- wp-includes/class-wp-xmlrpc-server.php	(revision 19632)
+++ wp-includes/class-wp-xmlrpc-server.php	(working copy)
@@ -64,6 +64,7 @@
 			'wp.getMediaItem'		=> 'this:wp_getMediaItem',
 			'wp.getMediaLibrary'	=> 'this:wp_getMediaLibrary',
 			'wp.getPostFormats'     => 'this:wp_getPostFormats',
+			'wp.getTerms'			=> 'this:wp_getTerms',
 
 			// Blogger API
 			'blogger.getUsersBlogs' => 'this:blogger_getUsersBlogs',
@@ -1702,6 +1703,64 @@
 		return $formats;
 	}
 
+	/**
+	 * Prepares term data for return in an XML-RPC object
+	 *
+	 * @param array $term The unprepared term data
+	 * @return array The prepared term data
+	 */
+	function prepare_term( $term ) {
+		$_term = (array) $term;
+
+		return apply_filters( 'xmlrpc_prepare_term', $_term, $term );
+	}
+
+	/**
+	 * Retrieve terms
+	 *
+	 * @uses get_terms()
+	 * @param array $args Method parameters. Contains:
+	 *  - int     $blog_id
+	 *  - string  $username
+	 *  - string  $password
+	 *  - string   $taxonomy_name
+	 * @return array terms
+	 */
+	function wp_getTerms( $args ) {
+		$this->escape( $args );
+
+		$blog_id        = (int) $args[0];
+		$username       = $args[1];
+		$password       = $args[2];
+		$taxonomy_name  = $args[3];
+
+		if ( ! $user = $this->login( $username, $password ) )
+			return $this->error;
+
+		do_action( 'xmlrpc_call', 'wp.getTerms' );
+
+		if ( ! taxonomy_exists( $taxonomy_name ) )
+			return new IXR_Error( 403, __( 'Invalid taxonomy name.' ) );
+
+		$taxonomy = get_taxonomy( $taxonomy_name );
+
+		if( ! current_user_can( $taxonomy->cap->assign_terms ) )
+			return new IXR_Error( 401, __( 'You are not allowed to assign terms in this taxonomy.' ) );
+
+		$terms = get_terms( $taxonomy_name , array( 'get' => 'all' ) );
+
+		if ( is_wp_error( $terms ) )
+			return new IXR_Error( 500, $terms->get_error_message() );
+
+		$struct = array();
+
+		foreach ( $terms as $term ) {
+			$struct[] = $this->prepare_term( $term );
+		}
+
+		return $struct;
+	}
+
 	/* Blogger API functions.
 	 * specs on http://plant.blogger.com/api and http://groups.yahoo.com/group/bloggerDev/
 	 */