fix: Notify "roomlist" updates to federated users

When a participant is invited or disinvited to a conversation, or a
session is removed, the affected user receives a "roomlist" message with
type "invite" or "disinvite", while the rest of users in the
conversation receive a "roomlist" message with type "update" and a
"participant-list: refresh" property. Now both federated users and local
users receive the "roomlist" update.

Local users are also notified with a "roomlist" update when the
properties of the room change. However, in that case the signaling
server of federated users will be notified by the federated Nextcloud
server when the property changes are propagated to it, so there is no
need to notify federated users from the remote Nextcloud server in that
case.

Note, however, that independently of the users explicitly notified with
the "userids" parameter (which can include inactive participants) that
receive the "roomlist" message, the signaling server automatically
notifies all active participants in a conversation when it is modified,
so active federated users will receive a "room" message with the updated
properties (which may never be reflected in the proxy conversation, as
some properties are not propagated to the federated conversations).

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>

lib/Service/ParticipantService.php

@@ -1622,6 +1622,13 @@ public function getParticipantUserIds(Room $room, ?\DateTime $maxLastJoined = nu
 		return $this->getParticipantActorIdsByActorType($room, Attendee::ACTOR_USERS, $maxLastJoined);
 	}
 
+	/**
+	 * @return string[]
+	 */
+	public function getFederatedParticipantCloudIds(Room $room, ?\DateTime $maxLastJoined = null): array {
+		return $this->getParticipantActorIdsByActorType($room, Attendee::ACTOR_FEDERATED_USERS, $maxLastJoined);
+	}
+
 	/**
 	 * @return string[]
 	 */

lib/Signaling/BackendNotifier.php

@@ -142,6 +142,8 @@ private function backendRequest(Room $room, array $data): ?IResponse {
 	 * @throws \Exception
 	 */
 	public function roomInvited(Room $room, array $attendees): void {
+		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		$userIds = [];
 		foreach ($attendees as $attendee) {
 			if ($attendee->getActorType() === Attendee::ACTOR_USERS) {
@@ -155,7 +157,7 @@ public function roomInvited(Room $room, array $attendees): void {
 				'userids' => $userIds,
 				// TODO(fancycode): We should try to get rid of 'alluserids' and
 				// find a better way to notify existing users to update the room.
-				'alluserids' => $this->participantService->getParticipantUserIds($room),
+				'alluserids' => $allUserIds,
 				'properties' => $room->getPropertiesForSignaling('', false),
 			],
 		]);
@@ -177,6 +179,7 @@ public function roomInvited(Room $room, array $attendees): void {
 	 */
 	public function roomsDisinvited(Room $room, array $attendees): void {
 		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		sort($allUserIds);
 		$userIds = [];
 		foreach ($attendees as $attendee) {
@@ -213,6 +216,7 @@ public function roomsDisinvited(Room $room, array $attendees): void {
 	 */
 	public function roomSessionsRemoved(Room $room, array $sessionIds): void {
 		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		sort($allUserIds);
 		$start = microtime(true);
 		$this->backendRequest($room, [
@@ -245,6 +249,9 @@ public function roomModified(Room $room): void {
 		$this->backendRequest($room, [
 			'type' => 'update',
 			'update' => [
+				// Message not sent for federated users, as they will receive
+				// the message from their federated Nextcloud server once the
+				// property change is propagated.
 				'userids' => $this->participantService->getParticipantUserIds($room),
 				'properties' => $room->getPropertiesForSignaling(''),
 			],