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.getPostTerms'		=> 'this:wp_getPostTerms',
 
 			// Blogger API
 			'blogger.getUsersBlogs' => 'this:blogger_getUsersBlogs',
@@ -1702,6 +1703,67 @@
 		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 post terms
+	 *
+	 * @uses wp_get_object_terms()
+	 * @param array $args Method parameters. Contains:
+	 *  - int     $blog_id
+	 *  - string  $username
+	 *  - string  $password
+	 *  - int     $post_id
+	 * @return array term data
+	 */
+	function wp_getPostTerms( $args ) {
+		$this->escape( $args );
+
+		$blog_id            = (int) $args[0];
+		$username           = $args[1];
+		$password           = $args[2];
+		$post_id            = (int) $args[3];
+
+		if ( ! $user = $this->login( $username, $password ) )
+			return $this->error;
+
+		do_action( 'xmlrpc_call', 'wp.getPostTerms' );
+
+		$post = wp_get_single_post( $post_id, ARRAY_A );
+		if ( empty( $post['ID'] ) )
+			return new IXR_Error( 404, __( 'Invalid post ID.' ) );
+
+		$post_type = get_post_type_object( $post['post_type'] );
+
+		if( ! current_user_can( $post_type->cap->edit_post , $post_id ) )
+			return new IXR_Error( 401, __( 'Sorry, you are not allowed to edit this post.' ) );
+
+		$taxonomies = get_taxonomies( '' );
+
+		$terms = wp_get_object_terms( $post_id , $taxonomies );
+
+		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/
 	 */