-
Notifications
You must be signed in to change notification settings - Fork 875
/
parser.go
190 lines (157 loc) · 5.11 KB
/
parser.go
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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
Copyright 2021 The Karmada Authors.
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 imageparser
import (
_ "crypto/sha256" // initialize crypto/sha256 to enable sha256 algorithm
_ "crypto/sha512" // initialize crypto/sha512 to enable sha512 algorithm
"strings"
"github.com/distribution/distribution/v3/reference"
)
// Components make up a whole image.
// Basically we presume an image can be made of `[domain][:port][path]<name>[:tag][@sha256:digest]`, ie:
// fictional.registry.example:10443/karmada/karmada-controller-manager:v1.0.0 or
// fictional.registry.example:10443/karmada/karmada-controller-manager@sha256:50d858e0985ecc7f60418aaf0cc5ab587f42c2570a884095a9e8ccacd0f6545c
type Components struct {
// hostname is the prefix of referencing image, like "registry.k8s.io".
// It may optionally be followed by a port number, like "fictional.registry.example:10443".
hostname string
// repository is the short name of referencing image, like "karmada-controller-manager".
// It may be made up of slash-separated components, like "karmada/karmada-controller-manager".
repository string
// tag is the tag of referencing image. ie:
// - latest
// - v1.19.1
tag string
// digest is the digest of referencing image. ie:
// - sha256:50d858e0985ecc7f60418aaf0cc5ab587f42c2570a884095a9e8ccacd0f6545c
digest string
}
// Hostname returns the hostname, as well known as image registry.
func (c *Components) Hostname() string {
return c.hostname
}
// SetHostname sets the hostname.
func (c *Components) SetHostname(hostname string) {
c.hostname = hostname
}
// RemoveHostname removes the hostname.
func (c *Components) RemoveHostname() {
c.hostname = ""
}
// Repository returns the repository without hostname.
func (c *Components) Repository() string {
return c.repository
}
// SetRepository sets the repository.
func (c *Components) SetRepository(repository string) {
c.repository = repository
}
// RemoveRepository removes the repository.
func (c *Components) RemoveRepository() {
c.repository = ""
}
// FullRepository returns the whole repository, including hostname if not empty.
func (c *Components) FullRepository() string {
if c.hostname == "" {
return c.repository
}
return c.hostname + "/" + c.repository
}
// String returns the full name of the image, including repository and tag(or digest).
func (c Components) String() string {
if c.tag != "" {
return c.FullRepository() + ":" + c.tag
} else if c.digest != "" {
return c.FullRepository() + "@" + c.digest
}
return c.FullRepository()
}
// Tag returns the tag.
func (c *Components) Tag() string {
return c.tag
}
// SetTag sets the tag.
func (c *Components) SetTag(tag string) {
c.tag = tag
}
// RemoveTag removes the tag.
func (c *Components) RemoveTag() {
c.tag = ""
}
// Digest returns the digest.
func (c *Components) Digest() string {
return c.digest
}
// SetDigest sets the digest.
func (c *Components) SetDigest(digest string) {
c.digest = digest
}
// RemoveDigest removes the digest.
func (c *Components) RemoveDigest() {
c.digest = ""
}
// TagOrDigest returns image tag if not empty otherwise returns image digest.
func (c *Components) TagOrDigest() string {
if c.tag != "" {
return c.tag
}
return c.digest
}
// SetTagOrDigest sets image tag or digest by matching the input.
func (c *Components) SetTagOrDigest(input string) {
if anchoredTagRegexp.MatchString(input) {
c.SetTag(input)
c.RemoveDigest()
return
}
if anchoredDigestRegexp.MatchString(input) {
c.SetDigest(input)
c.RemoveTag()
}
}
// RemoveTagOrDigest removes tag or digest.
// Since tag and digest don't co-exist, so remove tag if tag not empty, otherwise remove digest.
func (c *Components) RemoveTagOrDigest() {
if c.tag != "" {
c.tag = ""
} else if c.digest != "" {
c.digest = ""
}
}
// Parse returns a Components of the given image.
func Parse(image string) (*Components, error) {
ref, err := reference.Parse(image)
if err != nil {
return nil, err
}
comp := &Components{}
if named, ok := ref.(reference.Named); ok {
comp.hostname, comp.repository = SplitHostname(named.Name())
}
if tagged, ok := ref.(reference.Tagged); ok {
comp.tag = tagged.Tag()
} else if digested, ok := ref.(reference.Digested); ok {
comp.digest = digested.Digest().String()
}
return comp, nil
}
// SplitHostname splits a repository name(ie: registry.k8s.io/kube-apiserver) to hostname(registry.k8s.io) and remotename(kube-apiserver) string.
func SplitHostname(name string) (hostname, remoteName string) {
i := strings.IndexRune(name, '/')
if i == -1 || (!strings.ContainsAny(name[:i], ".:") && name[:i] != "localhost") {
hostname, remoteName = "", name
} else {
hostname, remoteName = name[:i], name[i+1:]
}
return
}