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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 Catalogs struct {
Repos []string `json:"repositories"`
Next string `json:"next,omitempty"`
}
// 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(options...)
if err != nil {
return nil, err
}
f, err := newPuller(o).fetcher(o.context, target)
if err != nil {
return nil, err
}
uri := url.URL{
Scheme: target.Scheme(),
Host: target.RegistryStr(),
Path: "/v2/_catalog",
RawQuery: fmt.Sprintf("last=%s&n=%d", url.QueryEscape(last), n),
}
req, err := http.NewRequest(http.MethodGet, uri.String(), nil)
if err != nil {
return nil, err
}
resp, err := f.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 Catalogs
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(options...)
if err != nil {
return nil, err
}
// WithContext overrides the ctx passed directly.
if o.context != context.Background() {
ctx = o.context
}
return newPuller(o).catalog(ctx, target, o.pageSize)
}
func (f *fetcher) catalogPage(ctx context.Context, reg name.Registry, next string, pageSize int) (*Catalogs, error) {
if next == "" {
uri := &url.URL{
Scheme: reg.Scheme(),
Host: reg.RegistryStr(),
Path: "/v2/_catalog",
}
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 := Catalogs{}
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
}
type Catalogger struct {
f *fetcher
reg name.Registry
pageSize int
page *Catalogs
err error
needMore bool
}
func (l *Catalogger) Next(ctx context.Context) (*Catalogs, error) {
if l.needMore {
l.page, l.err = l.f.catalogPage(ctx, l.reg, l.page.Next, l.pageSize)
} else {
l.needMore = true
}
return l.page, l.err
}
func (l *Catalogger) HasNext() bool {
return l.page != nil && (!l.needMore || l.page.Next != "")
}
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