From 4f067b7af6edcbd56b28ac96f2e11eb87c9efb5b Mon Sep 17 00:00:00 2001
From: Gil Casadevall <gil@ixde.net>
Date: Wed, 22 Jun 2016 12:54:34 +0200
Subject: [PATCH] Added env variables validation

---
 main.go | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/main.go b/main.go
index 0fecff2..fdc9417 100644
--- a/main.go
+++ b/main.go
@@ -1,8 +1,11 @@
 package main
 
 import (
-	"github.com/go-chat-bot/bot/slack"
+	"errors"
+	"fmt"
 	"os"
+
+	"github.com/go-chat-bot/bot/slack"
 )
 
 const (
@@ -16,7 +19,30 @@ var (
 	kb *Kubebot
 )
 
+func validateEnvParams() error {
+	if os.Getenv(slackTokenLabel) == "" {
+		return errors.New("slackTokenLabel env variable not defined")
+	}
+	if os.Getenv(slackChannelsLabel) == "" {
+		return errors.New("slackChannelsLabel env variable not defined")
+	}
+	if os.Getenv(slackAdminsLabel) == "" {
+		return errors.New("slackAdminsLabel env variable not defined")
+	}
+	if os.Getenv(slackCommandsLabel) == "" {
+		return errors.New("slackCommandsLabel env variable not defined")
+	}
+
+	return nil
+}
+
 func main() {
+
+	if err := validateEnvParams(); err != nil {
+		fmt.Printf("Kubebot cannot run. Error: %s\n", err.Error())
+		return
+	}
+
 	kb = &Kubebot{
 		token:    os.Getenv(slackTokenLabel),
 		admins:   stringToMap(os.Getenv(slackAdminsLabel), " "),