57 lines
2.2 KiB
Go
57 lines
2.2 KiB
Go
package policyconfiguration
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/docker/docker/reference"
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)
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// DockerReferenceIdentity returns a string representation of the reference, suitable for policy lookup,
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// as a backend for ImageReference.PolicyConfigurationIdentity.
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// The reference must satisfy !reference.IsNameOnly().
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func DockerReferenceIdentity(ref reference.Named) (string, error) {
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res := ref.FullName()
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tagged, isTagged := ref.(reference.NamedTagged)
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digested, isDigested := ref.(reference.Canonical)
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switch {
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case isTagged && isDigested: // This should not happen, docker/reference.ParseNamed drops the tag.
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return "", fmt.Errorf("Unexpected Docker reference %s with both a name and a digest", ref.String())
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case !isTagged && !isDigested: // This should not happen, the caller is expected to ensure !reference.IsNameOnly()
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return "", fmt.Errorf("Internal inconsistency: Docker reference %s with neither a tag nor a digest", ref.String())
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case isTagged:
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res = res + ":" + tagged.Tag()
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case isDigested:
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res = res + "@" + digested.Digest().String()
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default: // Coverage: The above was supposed to be exhaustive.
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return "", errors.New("Internal inconsistency, unexpected default branch")
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}
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return res, nil
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}
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// DockerReferenceNamespaces returns a list of other policy configuration namespaces to search,
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// as a backend for ImageReference.PolicyConfigurationIdentity.
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// The reference must satisfy !reference.IsNameOnly().
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func DockerReferenceNamespaces(ref reference.Named) []string {
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// Look for a match of the repository, and then of the possible parent
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// namespaces. Note that this only happens on the expanded host names
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// and repository names, i.e. "busybox" is looked up as "docker.io/library/busybox",
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// then in its parent "docker.io/library"; in none of "busybox",
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// un-namespaced "library" nor in "" supposedly implicitly representing "library/".
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//
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// ref.FullName() == ref.Hostname() + "/" + ref.RemoteName(), so the last
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// iteration matches the host name (for any namespace).
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res := []string{}
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name := ref.FullName()
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for {
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res = append(res, name)
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lastSlash := strings.LastIndex(name, "/")
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if lastSlash == -1 {
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break
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}
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name = name[:lastSlash]
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}
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return res
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}
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