Move delay namespace out of the constructor

crates/projection-xmpp/src/presence.rs

@@ -149,14 +149,14 @@ impl<'a> XmppConnection<'a> {
                     server: Server(self.hostname_rooms.clone()),
                     resource: Option::from(Resource(history_message.author.name.clone().into())),
                 },
-                delay: Delay::new(
-                    Jid {
+                delay: Delay {
+                    from: Jid {
                         name: Option::from(Name(history_message.author.name.clone().into())),
                         server: Server(self.hostname_rooms.clone()),
                         resource: None,
                     },
-                    history_message.created_at.to_rfc3339(),
-                ),
+                    stamp: history_message.created_at.to_rfc3339(),
+                },
                 body: history_message.content.clone(),
             });
             tracing::info!(

crates/proto-xmpp/src/muc/mod.rs

@@ -10,6 +10,7 @@ use crate::xml::*;
 
 pub const XMLNS: &'static str = "http://jabber.org/protocol/muc";
 pub const XMLNS_USER: &'static str = "http://jabber.org/protocol/muc#user";
+pub const XMLNS_DELAY: &'static str = "urn:xmpp:delay";
 
 #[derive(PartialEq, Eq, Debug, Default)]
 pub struct History {
@@ -253,27 +254,16 @@ impl Role {
 
 #[derive(Debug, PartialEq, Eq)]
 pub struct Delay {
-    pub xmlns: String,
     pub from: Jid,
     pub stamp: String,
 }
 
-impl Delay {
-    pub fn new(from: Jid, stamp: String) -> Self {
-        Self {
-            xmlns: "urn:xmpp:delay".into(),
-            from,
-            stamp,
-        }
-    }
-}
-
 impl ToXml for Delay {
     fn serialize(&self, events: &mut Vec<Event>) {
         let mut tag = BytesStart::new("delay");
         tag.push_attribute(Attribute {
             key: QName(b"xmlns"),
-            value: self.xmlns.as_bytes().into(),
+            value: XMLNS_DELAY.as_bytes().into(),
         });
         tag.push_attribute(Attribute {
             key: QName(b"from"),