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https://github.com/matrix-org/dendrite
synced 2024-12-21 05:53:45 +01:00
Enforce history visibility etc for /rooms/{roomID}/state
This commit is contained in:
Neil Alexander
parent
48850d9995
commit
0b9257d2d1
2 changed files with 100 additions and 40 deletions
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@ -201,7 +201,7 @@ func Setup(
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if err != nil {
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return util.ErrorResponse(err)
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}
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return OnIncomingStateRequest(req.Context(), rsAPI, vars["roomID"])
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return OnIncomingStateRequest(req.Context(), device, rsAPI, vars["roomID"])
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})).Methods(http.MethodGet, http.MethodOptions)
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r0mux.Handle("/rooms/{roomID}/state/{type:[^/]+/?}", httputil.MakeAuthAPI("room_state", userAPI, func(req *http.Request, device *userapi.Device) util.JSONResponse {
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@ -22,7 +22,6 @@ import (
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/syncapi/types"
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userapi "github.com/matrix-org/dendrite/userapi/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/util"
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@ -42,57 +41,118 @@ type stateEventInStateResp struct {
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// TODO: Check if the user is in the room. If not, check if the room's history
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// is publicly visible. Current behaviour is returning an empty array if the
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// user cannot see the room's history.
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func OnIncomingStateRequest(ctx context.Context, rsAPI api.RoomserverInternalAPI, roomID string) util.JSONResponse {
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// TODO(#287): Auth request and handle the case where the user has left (where
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// we should return the state at the poin they left)
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stateReq := api.QueryLatestEventsAndStateRequest{
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RoomID: roomID,
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}
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stateRes := api.QueryLatestEventsAndStateResponse{}
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func OnIncomingStateRequest(ctx context.Context, device *userapi.Device, rsAPI api.RoomserverInternalAPI, roomID string) util.JSONResponse {
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var worldReadable bool
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var wantLatestState bool
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if err := rsAPI.QueryLatestEventsAndState(ctx, &stateReq, &stateRes); err != nil {
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// First of all, get the latest state of the room. We need to do this
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// so that we can look at the history visibility of the room. If the
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// room is world-readable then we will always return the latest state.
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stateRes := api.QueryLatestEventsAndStateResponse{}
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if err := rsAPI.QueryLatestEventsAndState(ctx, &api.QueryLatestEventsAndStateRequest{
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RoomID: roomID,
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StateToFetch: []gomatrixserverlib.StateKeyTuple{},
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}, &stateRes); err != nil {
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util.GetLogger(ctx).WithError(err).Error("queryAPI.QueryLatestEventsAndState failed")
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return jsonerror.InternalServerError()
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}
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if len(stateRes.StateEvents) == 0 {
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return util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("cannot find state"),
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}
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}
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resp := []stateEventInStateResp{}
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// Fill the prev_content and replaces_state keys if necessary
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for _, event := range stateRes.StateEvents {
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stateEvent := stateEventInStateResp{
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ClientEvent: gomatrixserverlib.HeaderedToClientEvents(
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[]gomatrixserverlib.HeaderedEvent{event}, gomatrixserverlib.FormatAll,
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)[0],
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}
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var prevEventRef types.PrevEventRef
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if len(event.Unsigned()) > 0 {
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if err := json.Unmarshal(event.Unsigned(), &prevEventRef); err != nil {
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util.GetLogger(ctx).WithError(err).Error("json.Unmarshal failed")
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// Look at the room state and see if we have a history visibility event
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// that marks the room as world-readable. If we don't then we assume that
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// the room is not world-readable.
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for _, ev := range stateRes.StateEvents {
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if ev.Type() == gomatrixserverlib.MRoomHistoryVisibility {
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content := map[string]string{}
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if err := json.Unmarshal(ev.Content(), &content); err != nil {
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util.GetLogger(ctx).WithError(err).Error("json.Unmarshal for history visibility failed")
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return jsonerror.InternalServerError()
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}
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// Fills the previous state event ID if the state event replaces another
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// state event
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if len(prevEventRef.ReplacesState) > 0 {
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stateEvent.ReplacesState = prevEventRef.ReplacesState
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}
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// Fill the previous event if the state event references a previous event
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if prevEventRef.PrevContent != nil {
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stateEvent.PrevContent = prevEventRef.PrevContent
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if visibility, ok := content["history_visibility"]; ok {
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worldReadable = visibility == "world_readable"
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break
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}
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}
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resp = append(resp, stateEvent)
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}
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// If the room isn't world-readable then we will instead try to find out
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// the state of the room based on the user's membership. If the user is
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// in the room then we'll want the latest state. If the user has never
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// been in the room and the room isn't world-readable, then we won't
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// return any state. If the user was in the room previously but is no
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// longer then we will return the state at the time that the user left.
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// membershipRes will only be populated if the room is not world-readable.
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var membershipRes api.QueryMembershipForUserResponse
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if !worldReadable {
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// The room isn't world-readable so try to work out based on the
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// user's membership if we want the latest state or not.
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err := rsAPI.QueryMembershipForUser(ctx, &api.QueryMembershipForUserRequest{
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RoomID: roomID,
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UserID: device.UserID,
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}, &membershipRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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// If the user has never been in the room then stop at this point.
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// We won't tell the user about a room they have never joined.
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if !membershipRes.HasBeenInRoom {
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return util.JSONResponse{
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Code: http.StatusForbidden,
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JSON: jsonerror.Forbidden(fmt.Sprintf("Unknown room %q or user %q has never joined this room", roomID, device.UserID)),
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}
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}
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// Otherwise, if the user has been in the room, whether or not we
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// give them the latest state will depend on if they are *still* in
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// the room.
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wantLatestState = membershipRes.IsInRoom
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} else {
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// The room is world-readable so the user join state is irrelevant,
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// just get the latest room state instead.
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wantLatestState = true
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}
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util.GetLogger(ctx).WithFields(log.Fields{
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"roomID": roomID,
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"state_at_event": !wantLatestState,
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}).Info("Fetching all state")
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stateEvents := []gomatrixserverlib.ClientEvent{}
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if wantLatestState {
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// If we are happy to use the latest state, either because the user is
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// still in the room, or because the room is world-readable, then just
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// use the result of the previous QueryLatestEventsAndState response
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// to find the state event, if provided.
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for _, ev := range stateRes.StateEvents {
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stateEvents = append(
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stateEvents,
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gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
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)
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}
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} else {
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// Otherwise, take the event ID of their leave event and work out what
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// the state of the room was before that event.
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var stateAfterRes api.QueryStateAfterEventsResponse
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err := rsAPI.QueryStateAfterEvents(ctx, &api.QueryStateAfterEventsRequest{
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RoomID: roomID,
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PrevEventIDs: []string{membershipRes.EventID},
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StateToFetch: []gomatrixserverlib.StateKeyTuple{},
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}, &stateAfterRes)
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if err != nil {
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util.GetLogger(ctx).WithError(err).Error("Failed to QueryMembershipForUser")
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return jsonerror.InternalServerError()
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}
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for _, ev := range stateRes.StateEvents {
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stateEvents = append(
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stateEvents,
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gomatrixserverlib.HeaderedToClientEvent(ev, gomatrixserverlib.FormatAll),
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)
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}
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}
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// Return the results to the requestor.
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return util.JSONResponse{
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Code: http.StatusOK,
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JSON: resp,
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JSON: stateEvents,
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}
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}
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