split s2s into units

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/server/event.rs

@@ -0,0 +1,52 @@
+use ruma::{
+	api::{client::error::ErrorKind, federation::event::get_event},
+	MilliSecondsSinceUnixEpoch, RoomId,
+};
+
+use crate::{services, Error, PduEvent, Result, Ruma};
+
+/// # `GET /_matrix/federation/v1/event/{eventId}`
+///
+/// Retrieves a single event from the server.
+///
+/// - Only works if a user of this server is currently invited or joined the
+///   room
+pub(crate) async fn get_event_route(body: Ruma<get_event::v1::Request>) -> Result<get_event::v1::Response> {
+	let origin = body.origin.as_ref().expect("server is authenticated");
+
+	let event = services()
+		.rooms
+		.timeline
+		.get_pdu_json(&body.event_id)?
+		.ok_or_else(|| Error::BadRequest(ErrorKind::NotFound, "Event not found."))?;
+
+	let room_id_str = event
+		.get("room_id")
+		.and_then(|val| val.as_str())
+		.ok_or_else(|| Error::bad_database("Invalid event in database."))?;
+
+	let room_id =
+		<&RoomId>::try_from(room_id_str).map_err(|_| Error::bad_database("Invalid room_id in event in database."))?;
+
+	if !services()
+		.rooms
+		.state_cache
+		.server_in_room(origin, room_id)?
+	{
+		return Err(Error::BadRequest(ErrorKind::forbidden(), "Server is not in room."));
+	}
+
+	if !services()
+		.rooms
+		.state_accessor
+		.server_can_see_event(origin, room_id, &body.event_id)?
+	{
+		return Err(Error::BadRequest(ErrorKind::forbidden(), "Server is not allowed to see event."));
+	}
+
+	Ok(get_event::v1::Response {
+		origin: services().globals.server_name().to_owned(),
+		origin_server_ts: MilliSecondsSinceUnixEpoch::now(),
+		pdu: PduEvent::convert_to_outgoing_federation_event(event),
+	})
+}