feat/authentication

+ moved pkg/auth-helper to internal/lib/auth
+ update AuthInfo
+ cleaning

internal/lib/auth/auth.go

@@ -0,0 +1,15 @@
+package authhelper
+
+import (
+	"errors"
+	"net/http"
+)
+
+func GetAuthInfo(r *http.Request) (*AuthInfo, error) {
+	ctxVal := r.Context().Value(AuthKey{})
+	if ctxVal == nil {
+		return nil, errors.New("can't get auth info")
+	}
+	authInfo := ctxVal.(*AuthInfo)
+	return authInfo, nil
+}