1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package name
import (
"strings"
)
const (
// These have the form: sha256:<hex string>
// TODO(dekkagaijin): replace with opencontainers/go-digest or docker/distribution's validation.
digestChars = "sh:0123456789abcdef"
digestDelim = "@"
)
// Digest stores a digest name in a structured form.
type Digest struct {
Repository
digest string
original string
}
// Ensure Digest implements Reference
var _ Reference = (*Digest)(nil)
// Context implements Reference.
func (d Digest) Context() Repository {
return d.Repository
}
// Identifier implements Reference.
func (d Digest) Identifier() string {
return d.DigestStr()
}
// DigestStr returns the digest component of the Digest.
func (d Digest) DigestStr() string {
return d.digest
}
// Name returns the name from which the Digest was derived.
func (d Digest) Name() string {
return d.Repository.Name() + digestDelim + d.DigestStr()
}
// String returns the original input string.
func (d Digest) String() string {
return d.original
}
func checkDigest(name string) error {
return checkElement("digest", name, digestChars, 7+64, 7+64)
}
// NewDigest returns a new Digest representing the given name.
func NewDigest(name string, opts ...Option) (Digest, error) {
// Split on "@"
parts := strings.Split(name, digestDelim)
if len(parts) != 2 {
return Digest{}, newErrBadName("a digest must contain exactly one '@' separator (e.g. registry/repository@digest) saw: %s", name)
}
base := parts[0]
digest := parts[1]
// Always check that the digest is valid.
if err := checkDigest(digest); err != nil {
return Digest{}, err
}
tag, err := NewTag(base, opts...)
if err == nil {
base = tag.Repository.Name()
}
repo, err := NewRepository(base, opts...)
if err != nil {
return Digest{}, err
}
return Digest{
Repository: repo,
digest: digest,
original: name,
}, nil
}
|
