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// Copyright 2019 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"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote/transport"
)
type catalog struct {
Repos []string `json:"repositories"`
}
// CatalogPage calls /_catalog, returning the list of repositories on the registry.
func CatalogPage(target name.Registry, last string, n int, options ...Option) ([]string, error) {
o, err := makeOptions(target, options...)
if err != nil {
return nil, err
}
scopes := []string{target.Scope(transport.PullScope)}
tr, err := transport.NewWithContext(o.context, target, o.auth, o.transport, scopes)
if err != nil {
return nil, err
}
query := fmt.Sprintf("last=%s&n=%d", url.QueryEscape(last), n)
uri := url.URL{
Scheme: target.Scheme(),
Host: target.RegistryStr(),
Path: "/v2/_catalog",
RawQuery: query,
}
client := http.Client{Transport: tr}
req, err := http.NewRequest(http.MethodGet, uri.String(), nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req.WithContext(o.context))
if err != nil {
return nil, err
}
defer resp.Body.Close()
if err := transport.CheckError(resp, http.StatusOK); err != nil {
return nil, err
}
var parsed catalog
if err := json.NewDecoder(resp.Body).Decode(&parsed); err != nil {
return nil, err
}
return parsed.Repos, nil
}
// Catalog calls /_catalog, returning the list of repositories on the registry.
func Catalog(ctx context.Context, target name.Registry, options ...Option) ([]string, error) {
o, err := makeOptions(target, options...)
if err != nil {
return nil, err
}
scopes := []string{target.Scope(transport.PullScope)}
tr, err := transport.NewWithContext(o.context, target, o.auth, o.transport, scopes)
if err != nil {
return nil, err
}
uri := &url.URL{
Scheme: target.Scheme(),
Host: target.RegistryStr(),
Path: "/v2/_catalog",
}
if o.pageSize > 0 {
uri.RawQuery = fmt.Sprintf("n=%d", o.pageSize)
}
client := http.Client{Transport: tr}
// WithContext overrides the ctx passed directly.
if o.context != context.Background() {
ctx = o.context
}
var (
parsed catalog
repoList []string
)
// get responses until there is no next page
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
req, err := http.NewRequest("GET", uri.String(), nil)
if err != nil {
return nil, err
}
req = req.WithContext(ctx)
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
}
repoList = append(repoList, parsed.Repos...)
uri, err = getNextPageURL(resp)
if err != nil {
return nil, err
}
// no next page
if uri == nil {
break
}
}
return repoList, nil
}
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