feat: expose ConversationClass (serde derive + rename Private→Dm) (#214)

Cargo.lock

@@ -3359,6 +3359,7 @@ dependencies = [
  "prost",
  "rand 0.9.4",
  "rand_core 0.6.4",
+ "serde",
  "shared-traits",
  "storage",
  "tempfile",

core/conversations/Cargo.toml

@@ -30,6 +30,7 @@ openmls_traits = "0.5.0"
 prost = "0.14.1"
 rand = "0.9"
 rand_core = { version = "0.6" }
+serde = { version = "1.0", features = ["derive"] }
 thiserror = "2.0.17"
 tracing = "0.1.44"
 x25519-dalek = { version = "2.0.1", features = [

core/conversations/src/inbox_v2.rs

@@ -122,7 +122,7 @@ impl InboxV2 {
 
     /// The convo built from an invite, paired with the display class its invite
     /// type implies: `InviteType::GroupV1` carries the pairwise DirectV1 welcome,
-    /// so it is `Private`; `InviteType::GroupV2` is a real group.
+    /// so it is `Dm`; `InviteType::GroupV2` is a real group.
     #[instrument(name = "inboxV2.handle_frame", skip_all, fields(user_id = %service_ctx.mls_identity.display_name()))]
     pub fn handle_frame<S: ExternalServices>(
         &self,
@@ -143,7 +143,7 @@ impl InboxV2 {
         match payload {
             InviteType::GroupV1(inv) => {
                 let convo = self.handle_heavy_invite(service_ctx, inv)?;
-                Ok(Some((Box::new(convo), ConversationClass::Private)))
+                Ok(Some((Box::new(convo), ConversationClass::Dm)))
             }
             InviteType::GroupV2(welcome_bytes) => {
                 info!("Process WelcomeMessage");

core/conversations/src/outcomes.rs

@@ -6,6 +6,7 @@
 //!   initial [`ConvoOutcome`].
 //! - [`PayloadOutcome`] — the union of the above, plus `Empty`.
 
+use serde::{Deserialize, Serialize};
 use storage::ConversationKind;
 
 use crate::conversation::ConversationId;
@@ -68,9 +69,9 @@ impl From<InboxOutcome> for PayloadOutcome {
 }
 
 /// Stable across protocol versions of the same conversation shape.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ConversationClass {
-    Private,
+    Dm,
     Group,
 }
 

crates/generic-chat/tests/saro_and_raya.rs

@@ -189,7 +189,7 @@ fn direct_v1_by_account_address() {
     // though its welcome rides the InboxV2 (GroupV1 invite) path.
     let raya_convo_id = expect_event(&raya_events, "ConversationStarted", |e| match e {
         Event::ConversationStarted { convo_id, class } => {
-            assert_eq!(class, ConversationClass::Private);
+            assert_eq!(class, ConversationClass::Dm);
             Ok(convo_id)
         }
         other => Err(other),