87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package archive
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import (
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"strings"
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"github.com/containerd/cri/pkg/util"
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digest "github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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// FilterRefPrefix restricts references to having the given image
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// prefix. Tag-only references will have the prefix prepended.
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func FilterRefPrefix(image string) func(string) string {
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return refTranslator(image, true)
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}
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// AddRefPrefix prepends the given image prefix to tag-only references,
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// while leaving returning full references unmodified.
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func AddRefPrefix(image string) func(string) string {
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return refTranslator(image, false)
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}
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// refTranslator creates a reference which only has a tag or verifies
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// a full reference.
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func refTranslator(image string, checkPrefix bool) func(string) string {
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return func(ref string) string {
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// Check if ref is full reference
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if strings.ContainsAny(ref, "/:@") {
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// If not prefixed, don't include image
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if checkPrefix && !isImagePrefix(ref, image) {
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return ""
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}
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return ref
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}
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return image + ":" + ref
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}
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}
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func isImagePrefix(s, prefix string) bool {
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if !strings.HasPrefix(s, prefix) {
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return false
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}
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if len(s) > len(prefix) {
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switch s[len(prefix)] {
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case '/', ':', '@':
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// Prevent matching partial namespaces
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default:
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return false
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}
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}
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return true
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}
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func normalizeReference(ref string) (string, error) {
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// TODO: Replace this function to not depend on reference package
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normalized, err := util.NormalizeImageRef(ref)
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if err != nil {
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return "", errors.Wrapf(err, "normalize image ref %q", ref)
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}
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return normalized.String(), nil
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}
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// DigestTranslator creates a digest reference by adding the
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// digest to an image name
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func DigestTranslator(prefix string) func(digest.Digest) string {
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return func(dgst digest.Digest) string {
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return prefix + "@" + dgst.String()
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}
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}
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