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// 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"
)
type tags struct {
Name string `json:"name"`
Tags []string `json:"tags"`
}
// 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(repo, options...)
if err != nil {
return nil, err
}
scopes := []string{repo.Scope(transport.PullScope)}
tr, err := transport.NewWithContext(o.context, repo.Registry, o.auth, o.transport, scopes)
if err != nil {
return nil, err
}
uri := &url.URL{
Scheme: repo.Registry.Scheme(),
Host: repo.Registry.RegistryStr(),
Path: fmt.Sprintf("/v2/%s/tags/list", repo.RepositoryStr()),
}
if o.pageSize > 0 {
uri.RawQuery = fmt.Sprintf("n=%d", o.pageSize)
}
client := http.Client{Transport: tr}
tagList := []string{}
parsed := tags{}
// get responses until there is no next page
for {
select {
case <-o.context.Done():
return nil, o.context.Err()
default:
}
req, err := http.NewRequestWithContext(o.context, "GET", uri.String(), nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if err := transport.CheckError(resp, http.StatusOK); err != nil {
return nil, err
}
if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
return nil, err
}
if err := resp.Body.Close(); err != nil {
return nil, err
}
tagList = append(tagList, parsed.Tags...)
uri, err = getNextPageURL(resp)
if err != nil {
return nil, err
}
// no next page
if uri == nil {
break
}
}
return tagList, 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
}
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