feat: Typing notifications in simplified sliding sync

What's missing? Being able to use separate rooms & lists for typing
indicators.
At the moment, we use the same ones as we use for the timeline, as
todo_rooms is quite intertwined. We need to disentangle this to get that
functionality, although I'm not sure if clients use it.

.typos.toml

@@ -1,5 +1,5 @@
 [files]
-extend-exclude = ["*.csr"]
+extend-exclude = ["*.csr", "*.lock"]
 
 [default.extend-words]
 "allocatedp" = "allocatedp"

Cargo.lock

@@ -3695,7 +3695,7 @@ dependencies = [
 [[package]]
 name = "ruma"
 version = "0.10.1"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "assign",
  "js_int",
@@ -3715,7 +3715,7 @@ dependencies = [
 [[package]]
 name = "ruma-appservice-api"
 version = "0.10.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -3727,7 +3727,7 @@ dependencies = [
 [[package]]
 name = "ruma-client-api"
 version = "0.18.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "as_variant",
  "assign",
@@ -3750,7 +3750,7 @@ dependencies = [
 [[package]]
 name = "ruma-common"
 version = "0.13.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "as_variant",
  "base64 0.22.1",
@@ -3782,7 +3782,7 @@ dependencies = [
 [[package]]
 name = "ruma-events"
 version = "0.28.1"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "as_variant",
  "indexmap 2.9.0",
@@ -3807,7 +3807,7 @@ dependencies = [
 [[package]]
 name = "ruma-federation-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "bytes",
  "headers",
@@ -3829,7 +3829,7 @@ dependencies = [
 [[package]]
 name = "ruma-identifiers-validation"
 version = "0.9.5"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "js_int",
  "thiserror 2.0.12",
@@ -3838,7 +3838,7 @@ dependencies = [
 [[package]]
 name = "ruma-identity-service-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -3848,7 +3848,7 @@ dependencies = [
 [[package]]
 name = "ruma-macros"
 version = "0.13.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "cfg-if",
  "proc-macro-crate",
@@ -3863,7 +3863,7 @@ dependencies = [
 [[package]]
 name = "ruma-push-gateway-api"
 version = "0.9.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "js_int",
  "ruma-common",
@@ -3875,7 +3875,7 @@ dependencies = [
 [[package]]
 name = "ruma-signatures"
 version = "0.15.0"
-source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=d6870a7fb7f6cccff63f7fd0ff6c581bad80e983#d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+source = "git+https://forgejo.ellis.link/continuwuation/ruwuma?rev=a48665b682be1016cea53ea5e7787442dfe7c1de#a48665b682be1016cea53ea5e7787442dfe7c1de"
 dependencies = [
  "base64 0.22.1",
  "ed25519-dalek",

Cargo.toml

@@ -350,7 +350,7 @@ version = "0.1.2"
 [workspace.dependencies.ruma]
 git = "https://forgejo.ellis.link/continuwuation/ruwuma"
 #branch = "conduwuit-changes"
-rev = "d6870a7fb7f6cccff63f7fd0ff6c581bad80e983"
+rev = "a48665b682be1016cea53ea5e7787442dfe7c1de"
 features = [
     "compat",
     "rand",
@@ -381,7 +381,7 @@ features = [
     "unstable-msc4121",
     "unstable-msc4125",
     "unstable-msc4186",
-    "unstable-msc4203", # sending to-device events to appservices 
+    "unstable-msc4203", # sending to-device events to appservices
     "unstable-msc4210", # remove legacy mentions
     "unstable-extensible-events",
     "unstable-pdu",

src/api/client/sync/v3.rs

@@ -808,7 +808,7 @@ async fn load_joined_room(
 			let typings = services
 				.rooms
 				.typing
-				.typings_all(room_id, sender_user)
+				.typings_event_for_user(room_id, sender_user)
 				.await?;
 
 			Ok(vec![serde_json::from_str(&serde_json::to_string(&typings)?)?])

src/api/client/sync/v5.rs

@@ -33,6 +33,7 @@ use ruma::{
 	events::{
 		AnyRawAccountDataEvent, AnySyncEphemeralRoomEvent, StateEventType, TimelineEventType,
 		room::member::{MembershipState, RoomMemberEventContent},
+		typing::TypingEventContent,
 	},
 	serde::Raw,
 	uint,
@@ -205,6 +206,9 @@ pub(crate) async fn sync_events_v5_route(
 		_ = tokio::time::timeout(duration, watcher).await;
 	}
 
+	let typing = collect_typing_events(services, sender_user, &body, &todo_rooms).await?;
+	response.extensions.typing = typing;
+
 	trace!(
 		rooms = ?response.rooms.len(),
 		account_data = ?response.extensions.account_data.rooms.len(),
@@ -288,6 +292,8 @@ where
 	Rooms: Iterator<Item = &'a RoomId> + Clone + Send + 'a,
 	AllRooms: Iterator<Item = &'a RoomId> + Clone + Send + 'a,
 {
+	// TODO MSC4186: Implement remaining list filters: is_dm, is_encrypted,
+	// room_types.
 	for (list_id, list) in &body.lists {
 		let active_rooms: Vec<_> = match list.filters.as_ref().and_then(|f| f.is_invite) {
 			| None => all_rooms.clone().collect(),
@@ -665,6 +671,62 @@ where
 	}
 	Ok(rooms)
 }
+
+async fn collect_typing_events(
+	services: &Services,
+	sender_user: &UserId,
+	body: &sync_events::v5::Request,
+	todo_rooms: &TodoRooms,
+) -> Result<sync_events::v5::response::Typing> {
+	if !body.extensions.typing.enabled.unwrap_or(false) {
+		return Ok(sync_events::v5::response::Typing::default());
+	}
+	let rooms: Vec<_> = body.extensions.typing.rooms.clone().unwrap_or_else(|| {
+		body.room_subscriptions
+			.keys()
+			.map(ToOwned::to_owned)
+			.collect()
+	});
+	let lists: Vec<_> = body
+		.extensions
+		.typing
+		.lists
+		.clone()
+		.unwrap_or_else(|| body.lists.keys().map(ToOwned::to_owned).collect::<Vec<_>>());
+
+	if rooms.is_empty() && lists.is_empty() {
+		return Ok(sync_events::v5::response::Typing::default());
+	}
+
+	let mut typing_response = sync_events::v5::response::Typing::default();
+	for (room_id, (required_state_request, timeline_limit, roomsince)) in todo_rooms {
+		if services.rooms.typing.last_typing_update(room_id).await? <= *roomsince {
+			continue;
+		}
+
+		match services
+			.rooms
+			.typing
+			.typing_users_for_user(room_id, sender_user)
+			.await
+		{
+			| Ok(typing_users) => {
+				typing_response.rooms.insert(
+					room_id.to_owned(), // Already OwnedRoomId
+					Raw::new(&sync_events::v5::response::SyncTypingEvent {
+						content: TypingEventContent::new(typing_users),
+					})?,
+				);
+			},
+			| Err(e) => {
+				warn!(%room_id, "Failed to get typing events for room: {}", e);
+			},
+		}
+	}
+
+	Ok(typing_response)
+}
+
 async fn collect_account_data(
 	services: &Services,
 	(sender_user, _, globalsince, body): (&UserId, &DeviceId, u64, &sync_events::v5::Request),

src/service/rooms/typing/mod.rs

@@ -179,18 +179,15 @@ impl Service {
 			.unwrap_or(0))
 	}
 
-	/// Returns a new typing EDU.
+	pub async fn typing_users_for_user(
-	pub async fn typings_all(
 		&self,
 		room_id: &RoomId,
 		sender_user: &UserId,
-	) -> Result<SyncEphemeralRoomEvent<ruma::events::typing::TypingEventContent>> {
+	) -> Result<Vec<OwnedUserId>> {
 		let room_typing_indicators = self.typing.read().await.get(room_id).cloned();
 
 		let Some(typing_indicators) = room_typing_indicators else {
-			return Ok(SyncEphemeralRoomEvent {
+			return Ok(Vec::new());
-				content: ruma::events::typing::TypingEventContent { user_ids: Vec::new() },
-			});
 		};
 
 		let user_ids: Vec<_> = typing_indicators
@@ -207,8 +204,19 @@ impl Service {
 			.collect()
 			.await;
 
+		Ok(user_ids)
+	}
+
+	/// Returns a new typing EDU.
+	pub async fn typings_event_for_user(
+		&self,
+		room_id: &RoomId,
+		sender_user: &UserId,
+	) -> Result<SyncEphemeralRoomEvent<ruma::events::typing::TypingEventContent>> {
 		Ok(SyncEphemeralRoomEvent {
-			content: ruma::events::typing::TypingEventContent { user_ids },
+			content: ruma::events::typing::TypingEventContent {
+				user_ids: self.typing_users_for_user(room_id, sender_user).await?,
+			},
 		})
 	}