add GroupParticipants state event support

crates/nip29/src/group.rs

@@ -10,8 +10,9 @@ use state::NostrRegistry;
 
 use crate::LOCAL_KEYS;
 use crate::protocol::{
-    GroupAdmins, GroupId, GroupKey, GroupMembers, GroupMetadata, GroupPins, GroupRoles,
-    MEMBERSHIP_KINDS, Membership, PIN_LIST, Pin, RENDER_KINDS, STATE_KINDS, TimelineWindow,
+    GroupAdmins, GroupId, GroupKey, GroupMembers, GroupMetadata, GroupParticipants, GroupPins,
+    GroupRoles, MEMBERSHIP_KINDS, Membership, PIN_LIST, Pin, RENDER_KINDS, STATE_KINDS,
+    TimelineWindow,
 };
 
 const REPLAY_LIMIT: usize = 100;
@@ -40,6 +41,7 @@ pub struct Group {
     members: GroupMembers,
     admins: GroupAdmins,
     roles: GroupRoles,
+    participants: GroupParticipants,
     pins: GroupPins,
     membership: Membership,
     membership_events: Vec<Event>,
@@ -64,6 +66,7 @@ impl Group {
             members: GroupMembers::default(),
             admins: GroupAdmins::default(),
             roles: GroupRoles::default(),
+            participants: GroupParticipants::default(),
             pins: GroupPins::default(),
             membership: Membership::Unknown,
             membership_events: Vec::new(),
@@ -99,6 +102,10 @@ impl Group {
         &self.roles
     }
 
+    pub fn participants(&self) -> &GroupParticipants {
+        &self.participants
+    }
+
     pub fn pins(&self) -> &GroupPins {
         &self.pins
     }
@@ -478,6 +485,10 @@ impl Group {
                 Ok(roles) => self.roles = roles,
                 Err(_) => return false,
             },
+            Kind::GroupLivekitParticipants => match GroupParticipants::parse(event) {
+                Ok(participants) => self.participants = participants,
+                Err(_) => return false,
+            },
             Kind::Custom(PIN_LIST) => match GroupPins::parse(event) {
                 Ok(pins) => self.pins = pins,
                 Err(_) => return false,

crates/nip29/src/protocol.rs

@@ -22,11 +22,12 @@ pub const RENDER_KINDS: [Kind; 5] = [
 pub const PIN_LIST: u16 = 39_005;
 pub const UPDATE_PIN_LIST: u16 = 9_010;
 
-pub const STATE_KINDS: [Kind; 5] = [
+pub const STATE_KINDS: [Kind; 6] = [
     Kind::GroupMetadata,
     Kind::GroupAdmins,
     Kind::GroupMembers,
     Kind::GroupRoles,
+    Kind::GroupLivekitParticipants,
     Kind::Custom(PIN_LIST),
 ];
 
@@ -519,6 +520,37 @@ impl GroupRoles {
     }
 }
 
+#[derive(Debug, Clone, Default)]
+pub struct GroupParticipants(Vec<PublicKey>);
+
+impl GroupParticipants {
+    pub fn parse(event: &Event) -> Result<Self> {
+        if event.kind != Kind::GroupLivekitParticipants {
+            bail!("not a group participants event: kind {}", event.kind);
+        }
+
+        let mut participants = Vec::new();
+
+        for tag in event.tags.iter().filter(|tag| tag.kind() == "participant") {
+            let Some(public_key) = tag.content() else {
+                continue;
+            };
+
+            participants.push(PublicKey::parse(public_key)?);
+        }
+
+        Ok(Self(participants))
+    }
+
+    pub fn contains(&self, public_key: &PublicKey) -> bool {
+        self.0.contains(public_key)
+    }
+
+    pub fn iter(&self) -> impl Iterator<Item = &PublicKey> {
+        self.0.iter()
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum Pin {
     Event(EventId),