From 889c89ec79fc4ee1eaff0aba597cff40119e96b9 Mon Sep 17 00:00:00 2001
From: Rickard von Essen <rickard.von.essen@gmail.com>
Date: Wed, 15 Aug 2018 15:27:00 +0200
Subject: [PATCH] Validate tags

---
 builder/digitalocean/config.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/builder/digitalocean/config.go b/builder/digitalocean/config.go
index bb4175972..19c802c4b 100644
--- a/builder/digitalocean/config.go
+++ b/builder/digitalocean/config.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"regexp"
 	"time"
 
 	"github.com/hashicorp/packer/common"
@@ -125,6 +126,13 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 	if c.Tags == nil {
 		c.Tags = make([]string, 0)
 	}
+	tagRe := regexp.MustCompile("^[[:alnum:]:_-]{1,255}$")
+
+	for _, t := range c.Tags {
+		if !tagRe.MatchString(t) {
+			errs = packer.MultiErrorAppend(errs, errors.New(fmt.Sprintf("invalid tag: %s", t)))
+		}
+	}
 
 	if errs != nil && len(errs.Errors) > 0 {
 		return nil, nil, errs