use crate::{database::DatabaseGuard, ConduitResult, Error, Ruma};
use ruma::api::client::{error::ErrorKind, r0::context::get_context};
use std::convert::TryFrom;
#[cfg(feature = "conduit_bin")]
use rocket::get;
/// # `GET /_matrix/client/r0/rooms/{roomId}/context`
///
/// Allows loading room history around an event.
///
/// - Only works if the user is joined (TODO: always allow, but only show events if the user was
/// joined, depending on history_visibility)
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/client/r0/rooms/<_>/context/<_>", data = "<body>")
)]
#[tracing::instrument(skip(db, body))]
pub async fn get_context_route(
db: DatabaseGuard,
body: Ruma<get_context::Request<'_>>,
) -> ConduitResult<get_context::Response> {
let sender_user = body.sender_user.as_ref().expect("user is authenticated");
if !db.rooms.is_joined(sender_user, &body.room_id)? {
return Err(Error::BadRequest(
ErrorKind::Forbidden,
"You don't have permission to view this room.",
));
}
let base_pdu_id = db
.rooms
.get_pdu_id(&body.event_id)?
.ok_or(Error::BadRequest(
ErrorKind::NotFound,
"Base event id not found.",
))?;
let base_token = db.rooms.pdu_count(&base_pdu_id)?;
let base_event = db
.rooms
.get_pdu_from_id(&base_pdu_id)?
.ok_or(Error::BadRequest(
ErrorKind::NotFound,
"Base event not found.",
))?
.to_room_event();
let events_before: Vec<_> = db
.rooms
.pdus_until(sender_user, &body.room_id, base_token)?
.take(
u32::try_from(body.limit).map_err(|_| {
Error::BadRequest(ErrorKind::InvalidParam, "Limit value is invalid.")
})? as usize
/ 2,
)
.filter_map(|r| r.ok()) // Remove buggy events
.collect();
let start_token = events_before
.last()
.and_then(|(pdu_id, _)| db.rooms.pdu_count(pdu_id).ok())
.map(|count| count.to_string());
let events_before: Vec<_> = events_before
.into_iter()
.map(|(_, pdu)| pdu.to_room_event())
.collect();
let events_after: Vec<_> = db
.rooms
.pdus_after(sender_user, &body.room_id, base_token)?
.take(
u32::try_from(body.limit).map_err(|_| {
Error::BadRequest(ErrorKind::InvalidParam, "Limit value is invalid.")
})? as usize
/ 2,
)
.filter_map(|r| r.ok()) // Remove buggy events
.collect();
let end_token = events_after
.last()
.and_then(|(pdu_id, _)| db.rooms.pdu_count(pdu_id).ok())
.map(|count| count.to_string());
let events_after: Vec<_> = events_after
.into_iter()
.map(|(_, pdu)| pdu.to_room_event())
.collect();
let resp = get_context::Response {
start: start_token,
end: end_token,
events_before,
event: Some(base_event),
events_after,
state: db // TODO: State at event
.rooms
.room_state_full(&body.room_id)?
.values()
.map(|pdu| pdu.to_state_event())
.collect(),
};
Ok(resp.into())
}