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|
use crate::{services, Error, Result, Ruma};
use ruma::{
api::client::{context::get_context, error::ErrorKind, filter::LazyLoadOptions},
events::StateEventType,
};
use std::collections::HashSet;
use tracing::error;
/// # `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)
pub async fn get_context_route(
body: Ruma<get_context::v3::Request>,
) -> Result<get_context::v3::Response> {
let sender_user = body.sender_user.as_ref().expect("user is authenticated");
let sender_device = body.sender_device.as_ref().expect("user is authenticated");
let (lazy_load_enabled, lazy_load_send_redundant) = match &body.filter.lazy_load_options {
LazyLoadOptions::Enabled {
include_redundant_members,
} => (true, *include_redundant_members),
_ => (false, false),
};
let mut lazy_loaded = HashSet::new();
let base_token = services()
.rooms
.timeline
.get_pdu_count(&body.event_id)?
.ok_or(Error::BadRequest(
ErrorKind::NotFound,
"Base event id not found.",
))?;
let base_event =
services()
.rooms
.timeline
.get_pdu(&body.event_id)?
.ok_or(Error::BadRequest(
ErrorKind::NotFound,
"Base event not found.",
))?;
let room_id = base_event.room_id.clone();
if !services()
.rooms
.state_accessor
.user_can_see_event(sender_user, &room_id, &body.event_id)?
{
return Err(Error::BadRequest(
ErrorKind::Forbidden,
"You don't have permission to view this event.",
));
}
if !services().rooms.lazy_loading.lazy_load_was_sent_before(
sender_user,
sender_device,
&room_id,
&base_event.sender,
)? || lazy_load_send_redundant
{
lazy_loaded.insert(base_event.sender.as_str().to_owned());
}
// Use limit with maximum 100
let limit = u64::from(body.limit).min(100) as usize;
let base_event = base_event.to_room_event();
let events_before: Vec<_> = services()
.rooms
.timeline
.pdus_until(sender_user, &room_id, base_token)?
.take(limit / 2)
.filter_map(|r| r.ok()) // Remove buggy events
.filter(|(_, pdu)| {
services()
.rooms
.state_accessor
.user_can_see_event(sender_user, &room_id, &pdu.event_id)
.unwrap_or(false)
})
.collect();
for (_, event) in &events_before {
if !services().rooms.lazy_loading.lazy_load_was_sent_before(
sender_user,
sender_device,
&room_id,
&event.sender,
)? || lazy_load_send_redundant
{
lazy_loaded.insert(event.sender.as_str().to_owned());
}
}
let start_token = events_before
.last()
.map(|(count, _)| count.stringify())
.unwrap_or_else(|| base_token.stringify());
let events_before: Vec<_> = events_before
.into_iter()
.map(|(_, pdu)| pdu.to_room_event())
.collect();
let events_after: Vec<_> = services()
.rooms
.timeline
.pdus_after(sender_user, &room_id, base_token)?
.take(limit / 2)
.filter_map(|r| r.ok()) // Remove buggy events
.filter(|(_, pdu)| {
services()
.rooms
.state_accessor
.user_can_see_event(sender_user, &room_id, &pdu.event_id)
.unwrap_or(false)
})
.collect();
for (_, event) in &events_after {
if !services().rooms.lazy_loading.lazy_load_was_sent_before(
sender_user,
sender_device,
&room_id,
&event.sender,
)? || lazy_load_send_redundant
{
lazy_loaded.insert(event.sender.as_str().to_owned());
}
}
let shortstatehash = match services().rooms.state_accessor.pdu_shortstatehash(
events_after
.last()
.map_or(&*body.event_id, |(_, e)| &*e.event_id),
)? {
Some(s) => s,
None => services()
.rooms
.state
.get_room_shortstatehash(&room_id)?
.expect("All rooms have state"),
};
let state_ids = services()
.rooms
.state_accessor
.state_full_ids(shortstatehash)
.await?;
let end_token = events_after
.last()
.map(|(count, _)| count.stringify())
.unwrap_or_else(|| base_token.stringify());
let events_after: Vec<_> = events_after
.into_iter()
.map(|(_, pdu)| pdu.to_room_event())
.collect();
let mut state = Vec::new();
for (shortstatekey, id) in state_ids {
let (event_type, state_key) = services()
.rooms
.short
.get_statekey_from_short(shortstatekey)?;
if event_type != StateEventType::RoomMember {
let pdu = match services().rooms.timeline.get_pdu(&id)? {
Some(pdu) => pdu,
None => {
error!("Pdu in state not found: {}", id);
continue;
}
};
state.push(pdu.to_state_event());
} else if !lazy_load_enabled || lazy_loaded.contains(&state_key) {
let pdu = match services().rooms.timeline.get_pdu(&id)? {
Some(pdu) => pdu,
None => {
error!("Pdu in state not found: {}", id);
continue;
}
};
state.push(pdu.to_state_event());
}
}
let resp = get_context::v3::Response {
start: Some(start_token),
end: Some(end_token),
events_before,
event: Some(base_event),
events_after,
state,
};
Ok(resp)
}
|
