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More refactoring of the group session sharing code for clarity.

master
Denis Kasak 2021-03-02 10:27:19 +01:00
parent df8c489304
commit 2b5e1744ee
1 changed files with 23 additions and 22 deletions
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45
matrix_sdk_crypto/src/session_manager/group_sessions.rs
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@ -255,20 +255,19 @@ impl GroupSessionManager {
for user_id in users {
let user_devices = self.store.get_user_devices(&user_id).await?;
let non_blacklisted_devices: Vec<Device> = user_devices
.devices()
.filter(|d| !d.is_blacklisted())
.collect();
// If we haven't already concluded that the session should be rotated, check whether
// any of the devices in the session got deleted or blacklisted in the meantime. If so,
// we should also rotate the session.
// If we haven't already concluded that the session should be rotated for other
// reasons, we also need to check whether any of the devices in the session got deleted
// or blacklisted in the meantime. If so, we should also rotate the session.
if !should_rotate {
// Devices that should receive this session
let device_ids: HashSet<&DeviceId> = user_devices
.keys()
.filter(|d| {
!user_devices
.get(d)
.map_or(false, |d| d.is_blacklisted())
})
.map(|d| d.as_ref())
// Device IDs that should receive this session
let non_blacklisted_device_ids: HashSet<&DeviceId> = non_blacklisted_devices
.iter()
.map(|d| d.device_id())
.collect();
if let Some(shared) = outbound.shared_with_set.get(user_id) {
@ -278,16 +277,18 @@ impl GroupSessionManager {
shared.iter().map(|d| d.key().clone()).collect();
let shared: HashSet<&DeviceId> = shared.iter().map(|d| d.as_ref()).collect();
// The difference between the devices that received the
// session and devices that should receive the session are
// our deleted or newly blacklisted devices
// The set difference between
//
// If the set isn't empty, a device got blacklisted or
// deleted, so remember it.
if !shared
.difference(&device_ids)
.collect::<HashSet<_>>()
.is_empty()
// 1. Devices that had previously received the session, and
// 2. Devices that would now receive the session
//
// represents newly deleted or blacklisted devices. If this set is non-empty,
// we must rotate.
let newly_deleted_or_blacklisted = shared
.difference(&non_blacklisted_device_ids)
.collect::<HashSet<_>>();
if !newly_deleted_or_blacklisted.is_empty()
{
should_rotate = true;
}
@ -297,7 +298,7 @@ impl GroupSessionManager {
devices
.entry(user_id.clone())
.or_insert_with(Vec::new)
.extend(user_devices.devices().filter(|d| !d.is_blacklisted()));
.extend(non_blacklisted_devices);
}
Ok((should_rotate, devices))