Function GetEventAuth

federationapi/routing/eventauth.go:26–77

GetEventAuth returns event auth for the roomID and eventID

(
	ctx context.Context,
	request *gomatrixserverlib.FederationRequest,
	rsAPI api.FederationRoomserverAPI,
	roomID string,
	eventID string,
)

// GetEventAuth returns event auth for the roomID and eventID
func GetEventAuth(
	ctx context.Context,
	request *gomatrixserverlib.FederationRequest,
	rsAPI api.FederationRoomserverAPI,
	roomID string,
	eventID string,
) util.JSONResponse {
	// If we don't think we belong to this room then don't waste the effort
	// responding to expensive requests for it.
	if err := ErrorIfLocalServerNotInRoom(ctx, rsAPI, roomID); err != nil {
		return *err
	}

	event, resErr := fetchEvent(ctx, rsAPI, eventID)
	if resErr != nil {
		return *resErr
	}

	if event.RoomID() != roomID {
		return util.JSONResponse{Code: http.StatusNotFound, JSON: jsonerror.NotFound("event does not belong to this room")}
	}
	resErr = allowedToSeeEvent(ctx, request.Origin(), rsAPI, eventID)
	if resErr != nil {
		return *resErr
	}

	var response api.QueryStateAndAuthChainResponse
	err := rsAPI.QueryStateAndAuthChain(
		ctx,
		&api.QueryStateAndAuthChainRequest{
			RoomID:             roomID,
			PrevEventIDs:       []string{eventID},
			AuthEventIDs:       event.AuthEventIDs(),
			OnlyFetchAuthChain: true,
		},
		&response,
	)
	if err != nil {
		return util.ErrorResponse(err)
	}

	if !response.RoomExists {
		return util.JSONResponse{Code: http.StatusNotFound, JSON: nil}
	}

	return util.JSONResponse{
		Code: http.StatusOK,
		JSON: gomatrixserverlib.RespEventAuth{
			AuthEvents: gomatrixserverlib.NewEventJSONsFromHeaderedEvents(response.AuthChainEvents),
		},
	}
}