.

migrations/20250510184011_channel_message.sql

@@ -103,3 +103,61 @@ BEGIN
     RETURN new_channel_id;
 END;
 $$;
+
+CREATE OR REPLACE FUNCTION create_group_channel(
+    p_creator_id UUID, -- The user initiating the group creation (will be owner)
+    p_recipient_user_ids UUID[], -- Array of all user IDs for the group (must include creator)
+    p_group_channel_type INT2 -- The channel type identifier for groups (e.g., 1)
+)
+    RETURNS UUID
+    LANGUAGE plpgsql
+AS
+$$
+DECLARE
+    new_channel_id                         UUID;
+    existing_channel_id                    UUID;
+    final_channel_name                     VARCHAR;
+    unique_sorted_recipient_ids            UUID[];
+    num_recipients                         INT;
+    uid                                    UUID;
+    -- Threshold for detailed name vs. summary name
+    MAX_MEMBERS_FOR_DETAILED_NAME CONSTANT INT := 3;
+BEGIN
+    -- Validate and process recipient IDs
+    IF p_recipient_user_ids IS NULL OR array_length(p_recipient_user_ids, 1) IS NULL THEN
+        RAISE EXCEPTION 'Recipient user IDs array must be provided and not empty.';
+    END IF;
+
+    -- Get unique, sorted recipient IDs for consistent checking and to avoid duplicates.
+    SELECT array_agg(DISTINCT u ORDER BY u) INTO unique_sorted_recipient_ids FROM unnest(p_recipient_user_ids) u;
+    num_recipients := array_length(unique_sorted_recipient_ids, 1);
+
+    -- Validate minimum number of recipients for a group
+    IF num_recipients < 1 THEN -- Groups typically have at least 2 members
+        RAISE EXCEPTION 'Group channels (type %) must have at least 2 recipients. Found %.', p_group_channel_type, num_recipients;
+    END IF;
+
+    -- Create new group channel
+    INSERT INTO "channel" ("name", "type", "position", "owner_id", "server_id", "parent")
+    VALUES ('Group',
+            p_group_channel_type,
+            0, -- Default position
+            p_creator_id,
+            NULL, -- Not a server channel
+            NULL -- Not a nested server channel
+           )
+    RETURNING id INTO new_channel_id;
+
+    -- Add all recipients to the channel_recipient table
+    INSERT INTO "channel_recipient" ("channel_id", "user_id")
+    VALUES (new_channel_id, p_creator_id);
+
+    INSERT INTO "channel_recipient" ("channel_id", "user_id")
+    SELECT new_channel_id, r_id
+    FROM unnest(unique_sorted_recipient_ids) AS r_id;
+
+    RAISE NOTICE 'Group channel (type %) named "%" created with ID: % by owner % for recipients: %',
+        p_group_channel_type, final_channel_name, new_channel_id, p_creator_id, unique_sorted_recipient_ids;
+    RETURN new_channel_id;
+END;
+$$;

src/database.rs

@@ -621,7 +621,7 @@ impl Database {
         &self,
         user1_id: entity::user::Id,
         user2_id: entity::user::Id,
-    ) -> Result<Option<entity::channel::Id>> {
+    ) -> Result<entity::channel::Id> {
         let channel_id = sqlx::query_scalar!(
             r#"SELECT create_dm_channel($1, $2, $3)"#,
             user1_id,
@@ -629,7 +629,26 @@ impl Database {
             entity::channel::ChannelType::DirectMessage as i16
         )
         .fetch_one(&self.pool)
-        .await?;
+        .await?
+        .expect("channel_id is null");
+
+        Ok(channel_id)
+    }
+
+    pub async fn procedure_create_group_channel(
+        &self,
+        creator_id: entity::user::Id,
+        users: &[entity::user::Id],
+    ) -> Result<entity::channel::Id> {
+        let channel_id = sqlx::query_scalar!(
+            r#"SELECT create_group_channel($1, $2, $3)"#,
+            creator_id,
+            users,
+            entity::channel::ChannelType::DirectMessage as i16
+        )
+        .fetch_one(&self.pool)
+        .await?
+        .expect("channel_id is null");
 
         Ok(channel_id)
     }

src/web/mod.rs

@@ -71,6 +71,7 @@ fn protected_router() -> axum::Router<state::AppState> {
         .route("/users/@me", get(user::me))
         .route("/users/@me", patch(user::patch))
         .route("/users/@me/channels", get(user::channel::list))
+        .route("/users/@me/channels", post(user::channel::create))
         .route("/users/{id}", get(user::get_by_id))
         // channel
         .route(

src/web/route/user/channel/create.rs

@@ -0,0 +1,75 @@
+use axum::Json;
+use axum::extract::State;
+use axum::response::IntoResponse;
+use axum_extra::extract::WithRejection;
+use serde::Deserialize;
+use validator::Validate;
+
+use crate::state::AppState;
+use crate::web::context::UserContext;
+use crate::web::entity::user::PartialUser;
+use crate::web::route::user::channel::RecipientChannel;
+use crate::web::ws;
+use crate::{entity, web};
+
+#[derive(Debug, Validate, Deserialize)]
+pub struct CreatePayload {
+    #[validate(length(min = 1, max = 32))]
+    recipients: Vec<entity::user::Id>,
+}
+
+pub async fn create(
+    State(state): State<AppState>,
+    context: UserContext,
+    WithRejection(Json(payload), _): WithRejection<Json<CreatePayload>, web::Error>,
+) -> web::Result<impl IntoResponse> {
+    match payload.validate() {
+        Ok(_) => {},
+        Err(err) => {
+            return Err(web::error::ClientError::ValidationFailed(err).into());
+        },
+    }
+
+    let channel_id = match payload.recipients.len() {
+        1 => {
+            let recipient = payload.recipients[0];
+            state
+                .database
+                .procedure_create_dm_channel(context.user_id, recipient)
+                .await?
+        },
+        _ => {
+            state
+                .database
+                .procedure_create_group_channel(context.user_id, &payload.recipients)
+                .await?
+        },
+    };
+
+    let channel = state.database.select_channel_by_id(channel_id).await?;
+
+    let recipients = state
+        .database
+        .select_channel_recipients(channel_id)
+        .await?
+        .unwrap_or_default()
+        .into_iter()
+        .map(|user| user.id)
+        .collect::<Vec<_>>();
+
+    let recipient_channels = RecipientChannel {
+        channel: channel.clone(),
+        recipients: recipients.clone(),
+    };
+
+    ws::gateway::util::send_message_channel(
+        state,
+        channel_id,
+        ws::gateway::event::Event::AddDmChannel {
+            channel,
+            recipients,
+        },
+    );
+
+    Ok(Json(recipient_channels))
+}

src/web/route/user/channel/list.rs

@@ -1,21 +1,11 @@
 use axum::Json;
 use axum::extract::State;
 use axum::response::IntoResponse;
-use serde::Serialize;
 
-use crate::entity::channel;
 use crate::state::AppState;
 use crate::web;
 use crate::web::context::UserContext;
-use crate::web::entity::user::PartialUser;
-
-#[derive(Debug, sqlx::FromRow, Serialize)]
-#[serde(rename_all = "camelCase")]
-pub struct RecipientChannel {
-    #[serde(flatten)]
-    pub channel: channel::Channel,
-    pub recipients: Vec<PartialUser>,
-}
+use crate::web::route::user::channel::RecipientChannel;
 
 pub async fn list(
     State(state): State<AppState>,
@@ -30,8 +20,7 @@ pub async fn list(
         let recipients = match recipients {
             Some(recipients) => recipients
                 .into_iter()
-                .filter(|user| user.id != context.user_id)
-                .map(PartialUser::from)
+                .map(|user| user.id)
                 .collect(),
             None => {
                 continue;

src/web/route/user/channel/mod.rs

@@ -1,3 +1,16 @@
+mod create;
 mod list;
 
+pub use create::create;
 pub use list::list;
+use serde::Serialize;
+
+use crate::entity::{channel, user};
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct RecipientChannel {
+    #[serde(flatten)]
+    pub channel: channel::Channel,
+    pub recipients: Vec<user::Id>,
+}

src/web/ws/gateway/event.rs

@@ -11,7 +11,10 @@ pub enum Event {
     RemoveServer { server_id: entity::server::Id },
 
     #[serde(rename_all = "camelCase")]
-    AddDmChannel { channel: entity::channel::Channel },
+    AddDmChannel {
+        channel: entity::channel::Channel,
+        recipients: Vec<entity::user::Id>,
+    },
 
     #[serde(rename_all = "camelCase")]
     RemoveDmChannel { channel_id: entity::channel::Id },
@@ -31,9 +34,7 @@ pub enum Event {
     },
 
     #[serde(rename_all = "camelCase")]
-    RemoveUser {
-        user_id: entity::user::Id,
-    },
+    RemoveUser { user_id: entity::user::Id },
 
     #[serde(rename_all = "camelCase")]
     AddServerMember {

src/webrtc/mod.rs

@@ -23,6 +23,7 @@ struct PeerState {
     peer_id: PeerId,
     peer_connection: Arc<webrtc::peer_connection::RTCPeerConnection>,
     outgoing_audio_track: Arc<TrackLocalStaticRTP>,
+    ssrc: u32,
 }
 
 struct RoomState {
@@ -136,7 +137,8 @@ pub async fn webrtc_task(
     Ok(())
 }
 
-#[tracing::instrument(skip(api, room_state, offer_signal), fields(peer_id = %offer_signal.offer.peer_id))]
+#[tracing::instrument(skip(api, room_state, offer_signal), fields(peer_id = %offer_signal.offer.peer_id
+))]
 async fn handle_peer(
     api: Arc<API>,
     room_state: Arc<RoomState>,
@@ -238,13 +240,11 @@ async fn handle_peer(
         peer_id: offer_signal.offer.peer_id,
         peer_connection: Arc::clone(&peer_connection),
         outgoing_audio_track: Arc::clone(&outgoing_track),
+        ssrc: 0,
     };
 
     {
-        if let Some((_, old_peer)) = room_state
-            .peers
-            .remove(&offer_signal.offer.peer_id)
-        {
+        if let Some((_, old_peer)) = room_state.peers.remove(&offer_signal.offer.peer_id) {
             let _ = old_peer.peer_connection.close().await;
         }
     }
@@ -262,13 +262,24 @@ async fn handle_peer(
     Ok(())
 }
 
-#[tracing::instrument(skip(room_state, track), fields(room_id = %room_state.room_id, peer_id = %peer_id))]
+#[tracing::instrument(skip(room_state, track), fields(room_id = %room_state.room_id, peer_id = %peer_id
+))]
 async fn forward_audio_track(
     room_state: Arc<RoomState>,
     peer_id: PeerId,
     track: Arc<TrackRemote>,
 ) -> anyhow::Result<()> {
     let mut rtp_buf = vec![0u8; 1500];
+
+    {
+        let mut peer_state = room_state
+            .peers
+            .get_mut(&peer_id)
+            .expect("peer state not found");
+
+        peer_state.ssrc = track.ssrc();
+    }
+
     while let Ok((rtp_packet, _attr)) = track.read(&mut rtp_buf).await {
         let other_peer_tracks = room_state
             .peers
@@ -276,7 +287,10 @@ async fn forward_audio_track(
             .filter_map(|pair| {
                 let peer_state = pair.value();
                 if peer_state.peer_id != peer_id {
-                    Some(peer_state.outgoing_audio_track.clone())
+                    let mut rtp_packet = rtp_packet.clone();
+                    rtp_packet.header.ssrc = peer_state.ssrc;
+
+                    Some((peer_state.outgoing_audio_track.clone(), rtp_packet))
                 } else {
                     None
                 }
@@ -290,7 +304,7 @@ async fn forward_audio_track(
 
         let write_futures = other_peer_tracks
             .iter()
-            .map(|outgoing_track| outgoing_track.write_rtp(&rtp_packet));
+            .map(|(outgoing_track, packet)| outgoing_track.write_rtp(&packet));
 
         let results = futures::future::join_all(write_futures).await;
         for result in results {