basicly implement acl crud ops with roles and resources

internal/server/error.go

@@ -0,0 +1,20 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+type ErrorResponse struct {
+	Error   string `json:"error"`
+	Details string `json:"details,omitempty"`
+}
+
+func WriteError(w http.ResponseWriter, error, details string, statusCode int) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(statusCode)
+	json.NewEncoder(w).Encode(ErrorResponse{
+		Error:   error,
+		Details: details,
+	})
+}