continuwuity/src/service/rooms/event_handler/parse_incoming_pdu.rs

use conduit::{pdu::gen_event_id_canonical_json, warn, Err, Error, Result};
use ruma::{api::client::error::ErrorKind, CanonicalJsonObject, OwnedEventId, OwnedRoomId, RoomId};
use serde_json::value::RawValue as RawJsonValue;

impl super::Service {
	pub fn parse_incoming_pdu(&self, pdu: &RawJsonValue) -> Result<(OwnedEventId, CanonicalJsonObject, OwnedRoomId)> {
		let value: CanonicalJsonObject = serde_json::from_str(pdu.get()).map_err(|e| {
			warn!("Error parsing incoming event {pdu:?}: {e:?}");
			Error::BadServerResponse("Invalid PDU in server response")
		})?;

		let room_id: OwnedRoomId = value
			.get("room_id")
			.and_then(|id| RoomId::parse(id.as_str()?).ok())
			.ok_or(Error::BadRequest(ErrorKind::InvalidParam, "Invalid room id in pdu"))?;

		let Ok(room_version_id) = self.services.state.get_room_version(&room_id) else {
			return Err!("Server is not in room {room_id}");
		};

		let Ok((event_id, value)) = gen_event_id_canonical_json(pdu, &room_version_id) else {
			// Event could not be converted to canonical json
			return Err!(Request(InvalidParam("Could not convert event to canonical json.")));
		};

		Ok((event_id, value, room_id))
	}
}