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94 lines
2.4 KiB
94 lines
2.4 KiB
// Copyright 2018 Google LLC All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package name
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import (
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// nolint: depguard
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_ "crypto/sha256" // Recommended by go-digest.
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"strings"
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"github.com/opencontainers/go-digest"
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)
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const digestDelim = "@"
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// Digest stores a digest name in a structured form.
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type Digest struct {
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Repository
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digest string
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original string
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}
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// Ensure Digest implements Reference
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var _ Reference = (*Digest)(nil)
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// Context implements Reference.
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func (d Digest) Context() Repository {
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return d.Repository
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}
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// Identifier implements Reference.
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func (d Digest) Identifier() string {
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return d.DigestStr()
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}
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// DigestStr returns the digest component of the Digest.
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func (d Digest) DigestStr() string {
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return d.digest
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}
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// Name returns the name from which the Digest was derived.
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func (d Digest) Name() string {
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return d.Repository.Name() + digestDelim + d.DigestStr()
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}
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// String returns the original input string.
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func (d Digest) String() string {
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return d.original
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}
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// NewDigest returns a new Digest representing the given name.
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func NewDigest(name string, opts ...Option) (Digest, error) {
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// Split on "@"
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parts := strings.Split(name, digestDelim)
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if len(parts) != 2 {
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return Digest{}, newErrBadName("a digest must contain exactly one '@' separator (e.g. registry/repository@digest) saw: %s", name)
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}
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base := parts[0]
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dig := parts[1]
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prefix := digest.Canonical.String() + ":"
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if !strings.HasPrefix(dig, prefix) {
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return Digest{}, newErrBadName("unsupported digest algorithm: %s", dig)
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}
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hex := strings.TrimPrefix(dig, prefix)
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if err := digest.Canonical.Validate(hex); err != nil {
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return Digest{}, err
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}
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tag, err := NewTag(base, opts...)
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if err == nil {
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base = tag.Repository.Name()
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}
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repo, err := NewRepository(base, opts...)
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if err != nil {
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return Digest{}, err
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}
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return Digest{
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Repository: repo,
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digest: dig,
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original: name,
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}, nil
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}
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