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
|
// 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 remote
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
)
// ListWithContext calls List with the given context.
//
// Deprecated: Use List and WithContext. This will be removed in a future release.
func ListWithContext(ctx context.Context, repo name.Repository, options ...Option) ([]string, error) {
return List(repo, append(options, WithContext(ctx))...)
}
// List calls /tags/list for the given repository, returning the list of tags
// in the "tags" property.
func List(repo name.Repository, options ...Option) ([]string, error) {
o, err := makeOptions(options...)
if err != nil {
return nil, err
}
return newPuller(o).List(o.context, repo)
}
type Tags struct {
Name string `json:"name"`
Tags []string `json:"tags"`
Next string `json:"next,omitempty"`
}
func (f *fetcher) listPage(ctx context.Context, repo name.Repository, next string, pageSize int) (*Tags, error) {
if next == "" {
uri := &url.URL{
Scheme: repo.Scheme(),
Host: repo.RegistryStr(),
Path: fmt.Sprintf("/v2/%s/tags/list", repo.RepositoryStr()),
}
if pageSize > 0 {
uri.RawQuery = fmt.Sprintf("n=%d", pageSize)
}
next = uri.String()
}
req, err := http.NewRequestWithContext(ctx, "GET", next, nil)
if err != nil {
return nil, err
}
resp, err := f.client.Do(req)
if err != nil {
return nil, err
}
if err := transport.CheckError(resp, http.StatusOK); err != nil {
return nil, err
}
parsed := Tags{}
if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
return nil, err
}
if err := resp.Body.Close(); err != nil {
return nil, err
}
uri, err := getNextPageURL(resp)
if err != nil {
return nil, err
}
if uri != nil {
parsed.Next = uri.String()
}
return &parsed, nil
}
// getNextPageURL checks if there is a Link header in a http.Response which
// contains a link to the next page. If yes it returns the url.URL of the next
// page otherwise it returns nil.
func getNextPageURL(resp *http.Response) (*url.URL, error) {
link := resp.Header.Get("Link")
if link == "" {
return nil, nil
}
if link[0] != '<' {
return nil, fmt.Errorf("failed to parse link header: missing '<' in: %s", link)
}
end := strings.Index(link, ">")
if end == -1 {
return nil, fmt.Errorf("failed to parse link header: missing '>' in: %s", link)
}
link = link[1:end]
linkURL, err := url.Parse(link)
if err != nil {
return nil, err
}
if resp.Request == nil || resp.Request.URL == nil {
return nil, nil
}
linkURL = resp.Request.URL.ResolveReference(linkURL)
return linkURL, nil
}
type Lister struct {
f *fetcher
repo name.Repository
pageSize int
page *Tags
err error
needMore bool
}
func (l *Lister) Next(ctx context.Context) (*Tags, error) {
if l.needMore {
l.page, l.err = l.f.listPage(ctx, l.repo, l.page.Next, l.pageSize)
} else {
l.needMore = true
}
return l.page, l.err
}
func (l *Lister) HasNext() bool {
return l.page != nil && (!l.needMore || l.page.Next != "")
}
|
