Implement forgetting about rooms (#1572)

* Add basic storage methods

* Add internal api handler

* Add check for forgotten room

* Add /rooms/{roomID}/forget endpoint

* Add missing rsAPI method

* Remove unused parameters

* Add passing tests

Signed-off-by: Till Faelligen <tfaelligen@gmail.com>

* Add missing file

* Add postgres migration

* Add sqlite migration

* Use Forgetter to forget room

* Remove empty line

* Update HTTP status codes

It looks like the spec calls for these to be 400, rather than 403: https://matrix.org/docs/spec/client_server/r0.6.1#post-matrix-client-r0-rooms-roomid-forget

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

roomserver/api/api.go

@@ -147,6 +147,9 @@ type RoomserverInternalAPI interface {
 		response *PerformBackfillResponse,
 	) error
 
+	// PerformForget forgets a rooms history for a specific user
+	PerformForget(ctx context.Context, req *PerformForgetRequest, resp *PerformForgetResponse) error
+
 	// Asks for the default room version as preferred by the server.
 	QueryRoomVersionCapabilities(
 		ctx context.Context,

roomserver/api/api_trace.go

@@ -194,6 +194,16 @@ func (t *RoomserverInternalAPITrace) PerformBackfill(
 	return err
 }
 
+func (t *RoomserverInternalAPITrace) PerformForget(
+	ctx context.Context,
+	req *PerformForgetRequest,
+	res *PerformForgetResponse,
+) error {
+	err := t.Impl.PerformForget(ctx, req, res)
+	util.GetLogger(ctx).WithError(err).Infof("PerformForget req=%+v res=%+v", js(req), js(res))
+	return err
+}
+
 func (t *RoomserverInternalAPITrace) QueryRoomVersionCapabilities(
 	ctx context.Context,
 	req *QueryRoomVersionCapabilitiesRequest,

roomserver/api/perform.go

@@ -159,3 +159,11 @@ type PerformPublishResponse struct {
 	// If non-nil, the publish request failed. Contains more information why it failed.
 	Error *PerformError
 }
+
+// PerformForgetRequest is a request to PerformForget
+type PerformForgetRequest struct {
+	RoomID string `json:"room_id"`
+	UserID string `json:"user_id"`
+}
+
+type PerformForgetResponse struct{}

roomserver/api/query.go

@@ -140,7 +140,9 @@ type QueryMembershipForUserResponse struct {
 	// True if the user is in room.
 	IsInRoom bool `json:"is_in_room"`
 	// The current membership
-	Membership string
+	Membership string `json:"membership"`
+	// True if the user asked to forget this room.
+	IsRoomForgotten bool `json:"is_room_forgotten"`
 }
 
 // QueryMembershipsForRoomRequest is a request to QueryMembershipsForRoom
@@ -160,6 +162,8 @@ type QueryMembershipsForRoomResponse struct {
 	// True if the user has been in room before and has either stayed in it or
 	// left it.
 	HasBeenInRoom bool `json:"has_been_in_room"`
+	// True if the user asked to forget this room.
+	IsRoomForgotten bool `json:"is_room_forgotten"`
 }
 
 // QueryServerJoinedToRoomRequest is a request to QueryServerJoinedToRoom