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