Automatically disconnect user when token is invalid

matrixgw_backend/src/broadcast_messages.rs

@@ -0,0 +1,10 @@
+use crate::users::UserEmail;
+
+pub type BroadcastSender = tokio::sync::broadcast::Sender<BroadcastMessage>;
+
+/// Broadcast messages
+#[derive(Debug, Clone)]
+pub enum BroadcastMessage {
+    /// User is or has been disconnected
+    UserDisconnected(UserEmail),
+}