add auth for future https srever and cfgHandler to load configuration

auth/auth.go

@@ -0,0 +1,15 @@
+package auth
+
+import (
+	"errors"
+
+	"github.com/gin-gonic/gin"
+)
+
+func GetIDFromAuth(c *gin.Context) (string, error) {
+	auth := c.GetHeader("Authorization")
+	if len(auth) > 7 && auth[:7] == "Bearer " {
+		return auth[7:], nil
+	}
+	return "", errors.New("authorization token missing")
+}