Add a component handshake parser.

src/component.rs

@@ -0,0 +1,32 @@
+// Copyright (c) 2018 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+use try_from::TryFrom;
+
+use minidom::Element;
+use error::Error;
+use helpers::Base64;
+use ns;
+
+generate_element_with_text!(Handshake, "handshake", ns::COMPONENT,
+    data: Base64<Vec<u8>>
+);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<handshake xmlns='jabber:component:accept'/>".parse().unwrap();
+        let handshake = Handshake::try_from(elem).unwrap();
+        assert!(handshake.data.is_empty());
+
+        let elem: Element = "<handshake xmlns='jabber:component:accept'>AAAA</handshake>".parse().unwrap();
+        let handshake = Handshake::try_from(elem).unwrap();
+        assert_eq!(handshake.data, b"\0\0\0");
+    }
+}