Add config validation for service types

pkg/app/authorizer.go

@@ -86,6 +86,13 @@ func (e *Authorizer) ConfigServices() error {
 	if err != nil {
 		return err
 	}
+	e.Services["edge"] = edgeDir
+
+	for key := range e.Configuration.Services {
+		if !(contains(edgeDir.AvailableServices(), key) || key == authorizerService) {
+			return errors.Errorf("unknown service type %s", key)
+		}
+	}
 
 	e.Services = make(map[string]ServiceTypes)
 
@@ -105,7 +112,6 @@ func (e *Authorizer) ConfigServices() error {
 		unary, stream := middlewareList.AsGRPCOptions()
 		opts = append(opts, unary, stream)
 
-		e.Services["edge"] = edgeDir
 		if contains(serviceConfig.registeredServices, "authorizer") {
 			topaz, err := NewTopaz(serviceConfig.API, &e.Configuration.Common, opts, e.Logger)
 			if err != nil {