configure reva gateway endpoint for sharing driver

.bingo/Variables.mk

@@ -100,3 +100,4 @@ $(REFLEX): $(BINGO_DIR)/reflex.mod
 	@# Install binary/ries using Go 1.14+ build command. This is using bwplotka/bingo-controlled, separate go module with pinned dependencies.
 	@echo "(re)installing $(GOBIN)/reflex-v0.3.1"
 	@cd $(BINGO_DIR) && $(GO) build -mod=mod -modfile=reflex.mod -o=$(GOBIN)/reflex-v0.3.1 "github.com/cespare/reflex"
+

.bingo/variables.env

@@ -35,3 +35,4 @@ PROTOC_GEN_MICROWEB="${GOBIN}/protoc-gen-microweb-v0.0.0-20211219183901-997c02ca
 PROTOC_GEN_OPENAPIV2="${GOBIN}/protoc-gen-openapiv2-v2.7.2"
 
 REFLEX="${GOBIN}/reflex-v0.3.1"
+

storage/pkg/command/sharing.go

@@ -121,7 +121,8 @@ func sharingConfigFromStruct(c *cli.Context, cfg *config.Config) map[string]inte
 					"driver": cfg.Reva.Sharing.UserDriver,
 					"drivers": map[string]interface{}{
 						"json": map[string]interface{}{
-							"file": cfg.Reva.Sharing.UserJSONFile,
+							"file":         cfg.Reva.Sharing.UserJSONFile,
+							"gateway_addr": cfg.Reva.Gateway.Endpoint,
 						},
 						"sql": map[string]interface{}{ // cernbox sql
 							"db_username":                   cfg.Reva.Sharing.UserSQLUsername,