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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 name
import (
"net"
"net/url"
"regexp"
"strings"
)
// Detect more complex forms of local references.
var reLocal = regexp.MustCompile(`.*\.local(?:host)?(?::\d{1,5})?$`)
// Detect the loopback IP (127.0.0.1)
var reLoopback = regexp.MustCompile(regexp.QuoteMeta("127.0.0.1"))
// Detect the loopback IPV6 (::1)
var reipv6Loopback = regexp.MustCompile(regexp.QuoteMeta("::1"))
// Registry stores a docker registry name in a structured form.
type Registry struct {
insecure bool
registry string
}
// RegistryStr returns the registry component of the Registry.
func (r Registry) RegistryStr() string {
return r.registry
}
// Name returns the name from which the Registry was derived.
func (r Registry) Name() string {
return r.RegistryStr()
}
func (r Registry) String() string {
return r.Name()
}
// Scope returns the scope required to access the registry.
func (r Registry) Scope(string) string {
// The only resource under 'registry' is 'catalog'. http://goo.gl/N9cN9Z
return "registry:catalog:*"
}
func (r Registry) isRFC1918() bool {
ipStr := strings.Split(r.Name(), ":")[0]
ip := net.ParseIP(ipStr)
if ip == nil {
return false
}
for _, cidr := range []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"} {
_, block, _ := net.ParseCIDR(cidr)
if block.Contains(ip) {
return true
}
}
return false
}
// Scheme returns https scheme for all the endpoints except localhost or when explicitly defined.
func (r Registry) Scheme() string {
if r.insecure {
return "http"
}
if r.isRFC1918() {
return "http"
}
if strings.HasPrefix(r.Name(), "localhost:") {
return "http"
}
if reLocal.MatchString(r.Name()) {
return "http"
}
if reLoopback.MatchString(r.Name()) {
return "http"
}
if reipv6Loopback.MatchString(r.Name()) {
return "http"
}
return "https"
}
func checkRegistry(name string) error {
// Per RFC 3986, registries (authorities) are required to be prefixed with "//"
// url.Host == hostname[:port] == authority
if url, err := url.Parse("//" + name); err != nil || url.Host != name {
return newErrBadName("registries must be valid RFC 3986 URI authorities: %s", name)
}
return nil
}
// NewRegistry returns a Registry based on the given name.
// Strict validation requires explicit, valid RFC 3986 URI authorities to be given.
func NewRegistry(name string, opts ...Option) (Registry, error) {
opt := makeOptions(opts...)
if opt.strict && len(name) == 0 {
return Registry{}, newErrBadName("strict validation requires the registry to be explicitly defined")
}
if err := checkRegistry(name); err != nil {
return Registry{}, err
}
if name == "" {
name = opt.defaultRegistry
}
// Rewrite "docker.io" to "index.docker.io".
// See: https://github.com/google/go-containerregistry/issues/68
if name == defaultRegistryAlias {
name = DefaultRegistry
}
return Registry{registry: name, insecure: opt.insecure}, nil
}
// NewInsecureRegistry returns an Insecure Registry based on the given name.
//
// Deprecated: Use the Insecure Option with NewRegistry instead.
func NewInsecureRegistry(name string, opts ...Option) (Registry, error) {
opts = append(opts, Insecure)
return NewRegistry(name, opts...)
}
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