xmlstream: introduce XMPP specifics

tokio-xmpp/src/xmlstream/xmpp.rs

@@ -0,0 +1,34 @@
+// Copyright (c) 2024 Jonas Schäfer <jonas@zombofant.net>
+//
+// 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 xso::{AsXml, FromXml};
+
+use xmpp_parsers::{iq::Iq, message::Message, presence::Presence, sasl, starttls};
+
+/// Any valid XMPP stream-level element.
+#[derive(FromXml, AsXml, Debug)]
+#[xml()]
+pub enum XmppStreamElement {
+    /// IQ stanza
+    #[xml(transparent)]
+    Iq(Iq),
+
+    /// Message stanza
+    #[xml(transparent)]
+    Message(Message),
+
+    /// Presence stanza
+    #[xml(transparent)]
+    Presence(Presence),
+
+    /// SASL-related nonza
+    #[xml(transparent)]
+    Sasl(sasl::Nonza),
+
+    /// STARTTLS-related nonza
+    #[xml(transparent)]
+    Starttls(starttls::Nonza),
+}