forked from hashicorp/terraform
/
s3_tags.go
131 lines (114 loc) · 3.27 KB
/
s3_tags.go
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package aws
import (
"crypto/md5"
"encoding/base64"
"encoding/xml"
"log"
"github.com/hashicorp/aws-sdk-go/aws"
"github.com/hashicorp/aws-sdk-go/gen/s3"
"github.com/hashicorp/terraform/helper/schema"
)
// setTags is a helper to set the tags for a resource. It expects the
// tags field to be named "tags"
func setTagsS3(conn *s3.S3, d *schema.ResourceData) error {
if d.HasChange("tags") {
oraw, nraw := d.GetChange("tags")
o := oraw.(map[string]interface{})
n := nraw.(map[string]interface{})
create, remove := diffTagsS3(tagsFromMapS3(o), tagsFromMapS3(n))
// Set tags
if len(remove) > 0 {
log.Printf("[DEBUG] Removing tags: %#v", remove)
err := conn.DeleteBucketTagging(&s3.DeleteBucketTaggingRequest{
Bucket: aws.String(d.Get("bucket").(string)),
})
if err != nil {
return err
}
}
if len(create) > 0 {
log.Printf("[DEBUG] Creating tags: %#v", create)
tagging := s3.Tagging{
TagSet: create,
XMLName: xml.Name{
Space: "http://s3.amazonaws.com/doc/2006-03-01/",
Local: "Tagging",
},
}
// AWS S3 API requires us to send a base64 encoded md5 hash of the
// content, which we need to build ourselves since aws-sdk-go does not.
b, err := xml.Marshal(tagging)
if err != nil {
return err
}
h := md5.New()
h.Write(b)
base := base64.StdEncoding.EncodeToString(h.Sum(nil))
req := &s3.PutBucketTaggingRequest{
Bucket: aws.String(d.Get("bucket").(string)),
ContentMD5: aws.String(base),
Tagging: &tagging,
}
err = conn.PutBucketTagging(req)
if err != nil {
return err
}
}
}
return nil
}
// diffTags takes our tags locally and the ones remotely and returns
// the set of tags that must be created, and the set of tags that must
// be destroyed.
func diffTagsS3(oldTags, newTags []s3.Tag) ([]s3.Tag, []s3.Tag) {
// First, we're creating everything we have
create := make(map[string]interface{})
for _, t := range newTags {
create[*t.Key] = *t.Value
}
// Build the list of what to remove
var remove []s3.Tag
for _, t := range oldTags {
old, ok := create[*t.Key]
if !ok || old != *t.Value {
// Delete it!
remove = append(remove, t)
}
}
return tagsFromMapS3(create), remove
}
// tagsFromMap returns the tags for the given map of data.
func tagsFromMapS3(m map[string]interface{}) []s3.Tag {
result := make([]s3.Tag, 0, len(m))
for k, v := range m {
result = append(result, s3.Tag{
Key: aws.String(k),
Value: aws.String(v.(string)),
})
}
return result
}
// tagsToMap turns the list of tags into a map.
func tagsToMapS3(ts []s3.Tag) map[string]string {
result := make(map[string]string)
for _, t := range ts {
result[*t.Key] = *t.Value
}
return result
}
// return a slice of s3 tags associated with the given s3 bucket. Essentially
// s3.GetBucketTagging, except returns an empty slice instead of an error when
// there are no tags.
func getTagSetS3(s3conn *s3.S3, bucket string) ([]s3.Tag, error) {
request := &s3.GetBucketTaggingRequest{
Bucket: aws.String(bucket),
}
response, err := s3conn.GetBucketTagging(request)
if ec2err, ok := err.(aws.APIError); ok && ec2err.Code == "NoSuchTagSet" {
// There is no tag set associated with the bucket.
return []s3.Tag{}, nil
} else if err != nil {
return nil, err
}
return response.TagSet, nil
}