fixes mm-1239 adds config setting to turn off valet feature

api/post.go

@@ -58,6 +58,11 @@ func createPost(c *Context, w http.ResponseWriter, r *http.Request) {
 }
 
 func createValetPost(c *Context, w http.ResponseWriter, r *http.Request) {
+	if !utils.Cfg.TeamSettings.AllowValet {
+		c.Err = model.NewAppError("createValetPost", "The valet feature is currently turned off. Please contact your system administrator for details.", "")
+		c.Err.StatusCode = http.StatusNotImplemented
+	}
+
 	post := model.PostFromJson(r.Body)
 	if post == nil {
 		c.SetInvalidParam("createValetPost", "post")