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