Handle passwords serverside

cmd/serverFunc.go

@@ -15,6 +15,7 @@ import (
 
 var (
 	listenPort   string = "1302"
+	password     string = ""
 	isLogging    bool   = false
 	logLocation  string
 	listenerList []chan string
@@ -92,9 +93,31 @@ func populateChat(conn net.Conn) {
 
 }
 
+func getPasswd(conn net.Conn) error {
+	conn.Write([]byte("Password: "))
+	userPassNewline, err := bufio.NewReader(conn).ReadString('\n')
+	userPass := strings.TrimRight(userPassNewline, "\n")
+	if err != nil {
+		e := fmt.Errorf("Node %v didn't respond to password prompt!\n", getIP(conn))
+		return e
+	}
+	if userPass != password {
+		e := fmt.Errorf("Node %v attempted connecting with an incorrect password!\n", getIP(conn))
+		return e
+	}
+	return nil
+}
+
 func handleConn(conn net.Conn, chatChan chan string) {
 	defer conn.Close()
 
+	if password != "" {
+		if err := getPasswd(conn); err != nil {
+			log.Print(err)
+			return
+		}
+	}
+
 	go receiveMessageServer(conn, chatChan)
 
 	//////////////////////////////////