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credhelper.go
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credhelper.go
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/*
Copyright 2023 The Crossplane Authors.
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 credhelper provides a docker credential helper for the Upbound marketplace.
package credhelper
import (
"strings"
"github.com/docker/docker-credential-helpers/credentials"
"github.com/crossplane/crossplane-runtime/pkg/errors"
"github.com/crossplane/crossplane-runtime/pkg/logging"
"github.com/crossplane/crossplane/internal/xpkg/upbound/config"
)
const (
errUnimplemented = "operation is not implemented"
errInitializeSource = "unable to initialize source"
errExtractConfig = "unable to extract config"
errGetDefaultProfile = "unable to get default profile in config"
errGetProfile = "unable to get specified profile in config"
errUnsupportedDomain = "supplied server URL is not supported"
)
const (
defaultDockerUser = "_token"
)
// Helper is a docker credential helper for Upbound.
type Helper struct {
log logging.Logger
profile string
domain string
src config.Source
}
// Opt sets a helper option.
type Opt func(h *Helper)
// WithLogger sets the helper logger.
func WithLogger(l logging.Logger) Opt {
return func(h *Helper) {
h.log = l
}
}
// WithDomain sets the allowed registry domain.
func WithDomain(d string) Opt {
return func(h *Helper) {
h.domain = d
}
}
// WithProfile sets the helper profile.
func WithProfile(p string) Opt {
return func(h *Helper) {
h.profile = p
}
}
// WithSource sets the source for the helper config.
func WithSource(src config.Source) Opt {
return func(h *Helper) {
h.src = src
}
}
// New constructs a new Docker credential helper.
func New(opts ...Opt) *Helper {
h := &Helper{
log: logging.NewNopLogger(),
src: config.NewFSSource(),
}
for _, o := range opts {
o(h)
}
return h
}
// Add adds the supplied credentials.
func (h *Helper) Add(_ *credentials.Credentials) error {
return errors.New(errUnimplemented)
}
// Delete deletes credentials for the supplied server.
func (h *Helper) Delete(_ string) error {
return errors.New(errUnimplemented)
}
// List lists all the configured credentials.
func (h *Helper) List() (map[string]string, error) {
return nil, errors.New(errUnimplemented)
}
// Get gets credentials for the supplied server.
func (h *Helper) Get(serverURL string) (string, string, error) {
if !strings.Contains(serverURL, h.domain) {
h.log.Debug("Supplied server URL is not supported by this credentials helper", "serverURL", serverURL, "domain", h.domain)
return "", "", errors.New(errUnsupportedDomain)
}
h.log.Debug("Getting credentials for server", "serverURL", serverURL)
if err := h.src.Initialize(); err != nil {
return "", "", errors.Wrap(err, errInitializeSource)
}
conf, err := config.Extract(h.src)
if err != nil {
return "", "", errors.Wrap(err, errExtractConfig)
}
var p config.Profile
if h.profile == "" {
h.log.Debug("No profile specified, using default profile")
_, p, err = conf.GetDefaultUpboundProfile()
if err != nil {
return "", "", errors.Wrap(err, errGetDefaultProfile)
}
} else {
h.log.Debug("Using specified profile", "profile", h.profile)
p, err = conf.GetUpboundProfile(h.profile)
if err != nil {
return "", "", errors.Wrap(err, errGetProfile)
}
}
return defaultDockerUser, p.Session, nil
}