Initial commit

vendor/github.com/hyperhq/hypercli/registry/reference.go

@@ -0,0 +1,68 @@
+package registry
+
+import (
+	"strings"
+
+	"github.com/docker/distribution/digest"
+)
+
+// Reference represents a tag or digest within a repository
+type Reference interface {
+	// HasDigest returns whether the reference has a verifiable
+	// content addressable reference which may be considered secure.
+	HasDigest() bool
+
+	// ImageName returns an image name for the given repository
+	ImageName(string) string
+
+	// Returns a string representation of the reference
+	String() string
+}
+
+type tagReference struct {
+	tag string
+}
+
+func (tr tagReference) HasDigest() bool {
+	return false
+}
+
+func (tr tagReference) ImageName(repo string) string {
+	return repo + ":" + tr.tag
+}
+
+func (tr tagReference) String() string {
+	return tr.tag
+}
+
+type digestReference struct {
+	digest digest.Digest
+}
+
+func (dr digestReference) HasDigest() bool {
+	return true
+}
+
+func (dr digestReference) ImageName(repo string) string {
+	return repo + "@" + dr.String()
+}
+
+func (dr digestReference) String() string {
+	return dr.digest.String()
+}
+
+// ParseReference parses a reference into either a digest or tag reference
+func ParseReference(ref string) Reference {
+	if strings.Contains(ref, ":") {
+		dgst, err := digest.ParseDigest(ref)
+		if err == nil {
+			return digestReference{digest: dgst}
+		}
+	}
+	return tagReference{tag: ref}
+}
+
+// DigestReference creates a digest reference using a digest
+func DigestReference(dgst digest.Digest) Reference {
+	return digestReference{digest: dgst}
+}