feat(xmpp): make presence polymorphic wrt any fields

src/projections/xmpp/mod.rs

@@ -337,7 +337,7 @@ async fn socket_final(
                     proto::ClientPacket::Message(_) => todo!(),
                     proto::ClientPacket::Presence(p) => {
                         let mut events = vec![];
-                        let response = Presence {
+                        let response = Presence::<()> {
                             to: Some("darova@localhost/kek".to_string()),
                             from: Some("darova@localhost/kek".to_string()),
                             ..Default::default()

src/projections/xmpp/proto.rs

@@ -72,7 +72,7 @@ impl Parser for IqClientBodyParser {
 pub enum ClientPacket {
     Iq(Iq<IqClientBody>),
     Message(Message),
-    Presence(Presence),
+    Presence(Presence<Ignore>),
 }
 
 #[derive(From)]
@@ -91,7 +91,7 @@ enum ClientPacketParserInner {
     Initial,
     IqV(<Iq<IqClientBody> as FromXml>::P),
     MessageV(<Message as FromXml>::P),
-    PresenceV(<Presence as FromXml>::P),
+    PresenceV(<Presence<Ignore> as FromXml>::P),
 }
 
 impl Parser for ClientPacketParser {
@@ -111,7 +111,7 @@ impl Parser for ClientPacketParser {
                 let name = bytes.name();
                 match_parser!(ClientPacketParser, name, namespace, event;
                     Iq::<IqClientBody>,
-                    Presence,
+                    Presence::<Ignore>,
                     Message
                 )
             }

src/protos/xmpp/client.rs

@@ -342,13 +342,27 @@ impl<T: ToXml> ToXml for Iq<T> {
     }
 }
 
-#[derive(PartialEq, Eq, Debug, Default)]
+#[derive(PartialEq, Eq, Debug)]
-pub struct Presence {
+pub struct Presence<T> {
     pub to: Option<String>,
     pub from: Option<String>,
     pub priority: Option<PresencePriority>,
     pub show: Option<PresenceShow>,
     pub status: Vec<String>,
+    pub custom: Vec<T>,
+}
+
+impl<T> Default for Presence<T> {
+    fn default() -> Self {
+        Self {
+            to: Default::default(),
+            from: Default::default(),
+            priority: Default::default(),
+            show: Default::default(),
+            status: Default::default(),
+            custom: Default::default(),
+        }
+    }
 }
 
 #[derive(PartialEq, Eq, Debug)]
@@ -389,20 +403,21 @@ impl PresenceShow {
 }
 
 #[derive(From)]
-pub struct PresenceParser(PresenceParserInner);
+pub struct PresenceParser<T: FromXml>(PresenceParserInner<T>);
-enum PresenceParserInner {
+enum PresenceParserInner<T: FromXml> {
     Initial,
-    InPresence(Presence),
+    InPresence(Presence<T>),
-    InPriority(Presence),
+    InPriority(Presence<T>),
-    InPriorityEnd(Presence),
+    InPriorityEnd(Presence<T>),
-    InShow(Presence),
+    InShow(Presence<T>),
-    InShowEnd(Presence),
+    InShowEnd(Presence<T>),
-    InStatus(Presence),
+    InStatus(Presence<T>),
-    InStatusEnd(Presence),
+    InStatusEnd(Presence<T>),
+    InCustom(Presence<T>, T::P),
 }
 
-impl Parser for PresenceParser {
+impl<T: FromXml> Parser for PresenceParser<T> {
-    type Output = Result<Presence>;
+    type Output = Result<Presence<T>>;
 
     fn consume<'a>(
         self: Self,
@@ -425,8 +440,11 @@ impl Parser for PresenceParser {
                     b"priority" => {
                         Continuation::Continue(PresenceParserInner::InPriority(p).into())
                     }
-                    _ => Continuation::Final(Err(ffail!("Unexpected XML event: {event:?}"))),
+                    _ => PresenceParser(PresenceParserInner::InCustom(p, T::parse()))
+                        .consume(namespace, event),
                 },
+                Event::Empty(_) => PresenceParser(PresenceParserInner::InCustom(p, T::parse()))
+                    .consume(namespace, event),
                 Event::End(_) => Continuation::Final(Ok(p)),
                 _ => Continuation::Final(Err(ffail!("Unexpected XML event: {event:?}"))),
             },
@@ -489,24 +507,36 @@ impl Parser for PresenceParser {
                 Event::End(_) => Continuation::Continue(PresenceParserInner::InPresence(p).into()),
                 _ => Continuation::Final(Err(ffail!("Unexpected XML event: {event:?}"))),
             },
+            PresenceParserInner::InCustom(mut p, c) => match c.consume(namespace, event) {
+                Continuation::Final(Ok(res)) => {
+                    p.custom.push(res);
+                    Continuation::Continue(PresenceParserInner::InPresence(p).into())
+                }
+                Continuation::Final(Err(err)) => Continuation::Final(Err(ffail!(
+                    "Failed to parse custom presence element: {err}"
+                ))),
+                Continuation::Continue(c) => {
+                    Continuation::Continue(PresenceParserInner::InCustom(p, c).into())
+                }
+            },
         }
     }
 }
 
-impl FromXml for Presence {
+impl<T: FromXml> FromXml for Presence<T> {
-    type P = PresenceParser;
+    type P = PresenceParser<T>;
 
     fn parse() -> Self::P {
         PresenceParserInner::Initial.into()
     }
 }
 
-impl FromXmlTag for Presence {
+impl<T: FromXml> FromXmlTag for Presence<T> {
     const NAME: &'static str = "presence";
     const NS: &'static str = XMLNS;
 }
 
-impl ToXml for Presence {
+impl<T: ToXml> ToXml for Presence<T> {
     fn serialize(&self, events: &mut Vec<Event<'static>>) {
         let mut start = BytesStart::new("presence");
         if let Some(ref to) = self.to {

src/util/xml.rs

@@ -3,6 +3,9 @@ use quick_xml::name::ResolveResult;
 
 use crate::prelude::Result;
 
+mod ignore;
+pub use ignore::Ignore;
+
 pub trait FromXml: Sized {
     type P: Parser<Output = Result<Self>>;
 

src/util/xml/ignore.rs

@@ -0,0 +1,62 @@
+use super::*;
+use derive_more::From;
+
+#[derive(Default, Debug, PartialEq, Eq)]
+pub struct Ignore;
+
+#[derive(From)]
+pub struct IgnoreParser(IgnoreParserInner);
+
+enum IgnoreParserInner {
+    Initial,
+    InTag { name: Vec<u8>, depth: u8 },
+}
+
+impl Parser for IgnoreParser {
+    type Output = Result<Ignore>;
+
+    fn consume<'a>(
+        self: Self,
+        namespace: ResolveResult,
+        event: &Event<'a>,
+    ) -> Continuation<Self, Self::Output> {
+        match self.0 {
+            IgnoreParserInner::Initial => match event {
+                Event::Start(bytes) => {
+                    let name = bytes.name().0.to_owned();
+                    Continuation::Continue(IgnoreParserInner::InTag { name, depth: 0 }.into())
+                }
+                Event::Empty(_) => Continuation::Final(Ok(Ignore)),
+                _ => Continuation::Final(Ok(Ignore)),
+            },
+            IgnoreParserInner::InTag { name, depth } => match event {
+                Event::End(bytes) if name == bytes.name().0 => {
+                    if depth == 0 {
+                        Continuation::Final(Ok(Ignore))
+                    } else {
+                        Continuation::Continue(
+                            IgnoreParserInner::InTag {
+                                name,
+                                depth: depth - 1,
+                            }
+                            .into(),
+                        )
+                    }
+                }
+                _ => Continuation::Final(Ok(Ignore)),
+            },
+        }
+    }
+}
+
+impl FromXml for Ignore {
+    type P = IgnoreParser;
+
+    fn parse() -> Self::P {
+        IgnoreParserInner::Initial.into()
+    }
+}
+
+impl ToXml for () {
+    fn serialize(&self, events: &mut Vec<Event<'static>>) {}
+}