proxy: Return an error when autoprovision a user fails

Fixes: #6194

services/proxy/pkg/middleware/account_resolver.go

@@ -78,10 +78,14 @@ func (m accountResolver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 			user, err = m.userProvider.CreateUserFromClaims(req.Context(), claims)
 			if err != nil {
 				m.logger.Error().Err(err).Msg("Autoprovisioning user failed")
+				w.WriteHeader(http.StatusInternalServerError)
+				return
 			}
 			user, token, err = m.userProvider.GetUserByClaims(req.Context(), "userid", user.Id.OpaqueId)
 			if err != nil {
 				m.logger.Error().Err(err).Str("userid", user.Id.OpaqueId).Msg("Error getting token for autoprovisioned user")
+				w.WriteHeader(http.StatusUnauthorized)
+				return
 			}
 		}
 

services/proxy/pkg/user/backend/cs3.go

@@ -229,6 +229,8 @@ func (c cs3backend) isAlreadyExists(resp *http.Response) (bool, error) {
 		return false, err
 	}
 
+	c.logger.Warn().Str("OData Error", oDataErr.Error.Message).Msg("Error Response")
+
 	if oDataErr.Error.Code == errorcode.NameAlreadyExists.String() {
 		return true, nil
 	}