copy default parameters to prevent concurrent map write (#74)

auth/handler.go

@@ -30,6 +30,7 @@ import (
 
 	"github.com/dgrijalva/jwt-go"
 	"github.com/gomodule/redigo/redis"
+	"github.com/jinzhu/copier"
 	"github.com/mittwald/servicegateway/config"
 	"github.com/op/go-logging"
 	cache "github.com/patrickmn/go-cache"
@@ -106,7 +107,11 @@ func NewAuthenticationHandler(
 func (h *AuthenticationHandler) Authenticate(username string, password string, additionalBodyProperties map[string]interface{}) (*JWTResponse, error) {
 	response := JWTResponse{}
 
-	authRequest := h.config.ProviderConfig.Parameters
+	authRequest := make(map[string]interface{})
+	err := copier.Copy(&authRequest, h.config.ProviderConfig.Parameters)
+	if err != nil {
+		return nil, fmt.Errorf("failed to copy default parameters!")
+	}
 	authRequest["username"] = username
 	authRequest["password"] = password
 

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/gorilla/handlers v1.5.2
 	github.com/hashicorp/consul/api v1.26.1
 	github.com/hashicorp/golang-lru v1.0.2
+	github.com/jinzhu/copier v0.4.0
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7
 	github.com/patrickmn/go-cache v2.1.0+incompatible

go.sum

@@ -103,6 +103,8 @@ github.com/hashicorp/memberlist v0.5.0 h1:EtYPN8DpAURiapus508I4n9CzHs2W+8NZGbmmR
 github.com/hashicorp/memberlist v0.5.0/go.mod h1:yvyXLpo0QaGE59Y7hDTsTzDD25JYBZ4mHgHUZ8lrOI0=
 github.com/hashicorp/serf v0.10.1 h1:Z1H2J60yRKvfDYAOZLd2MU0ND4AH/WDz7xYHDWQsIPY=
 github.com/hashicorp/serf v0.10.1/go.mod h1:yL2t6BqATOLGc5HF7qbFkTfXoPIY0WZdWHfEvMqbG+4=
+github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
+github.com/jinzhu/copier v0.4.0/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=