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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 gcrane
import (
"context"
"net/http"
"runtime"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/crane"
"github.com/google/go-containerregistry/pkg/v1/google"
"github.com/google/go-containerregistry/pkg/v1/remote"
)
// Option is a functional option for gcrane operations.
type Option func(*options)
type options struct {
jobs int
remote []remote.Option
google []google.Option
crane []crane.Option
}
func makeOptions(opts ...Option) *options {
o := &options{
jobs: runtime.GOMAXPROCS(0),
remote: []remote.Option{
remote.WithAuthFromKeychain(Keychain),
},
google: []google.Option{
google.WithAuthFromKeychain(Keychain),
},
crane: []crane.Option{
crane.WithAuthFromKeychain(Keychain),
},
}
for _, option := range opts {
option(o)
}
return o
}
// WithJobs sets the number of concurrent jobs to run.
//
// The default number of jobs is GOMAXPROCS.
func WithJobs(jobs int) Option {
return func(o *options) {
o.jobs = jobs
}
}
// WithTransport is a functional option for overriding the default transport
// for remote operations.
func WithTransport(t http.RoundTripper) Option {
return func(o *options) {
o.remote = append(o.remote, remote.WithTransport(t))
o.google = append(o.google, google.WithTransport(t))
o.crane = append(o.crane, crane.WithTransport(t))
}
}
// WithUserAgent adds the given string to the User-Agent header for any HTTP
// requests.
func WithUserAgent(ua string) Option {
return func(o *options) {
o.remote = append(o.remote, remote.WithUserAgent(ua))
o.google = append(o.google, google.WithUserAgent(ua))
o.crane = append(o.crane, crane.WithUserAgent(ua))
}
}
// WithContext is a functional option for setting the context.
func WithContext(ctx context.Context) Option {
return func(o *options) {
o.remote = append(o.remote, remote.WithContext(ctx))
o.google = append(o.google, google.WithContext(ctx))
o.crane = append(o.crane, crane.WithContext(ctx))
}
}
// WithKeychain is a functional option for overriding the default
// authenticator for remote operations, using an authn.Keychain to find
// credentials.
//
// By default, gcrane will use gcrane.Keychain.
func WithKeychain(keys authn.Keychain) Option {
return func(o *options) {
// Replace the default keychain at position 0.
o.remote[0] = remote.WithAuthFromKeychain(keys)
o.google[0] = google.WithAuthFromKeychain(keys)
o.crane[0] = crane.WithAuthFromKeychain(keys)
}
}
// WithAuth is a functional option for overriding the default authenticator
// for remote operations.
//
// By default, gcrane will use gcrane.Keychain.
func WithAuth(auth authn.Authenticator) Option {
return func(o *options) {
// Replace the default keychain at position 0.
o.remote[0] = remote.WithAuth(auth)
o.google[0] = google.WithAuth(auth)
o.crane[0] = crane.WithAuth(auth)
}
}
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