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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 transport
import (
"fmt"
"net/http"
"runtime/debug"
)
var (
// Version can be set via:
// -ldflags="-X 'github.com/google/go-containerregistry/pkg/v1/remote/transport.Version=$TAG'"
Version string
ggcrVersion = defaultUserAgent
)
const (
defaultUserAgent = "go-containerregistry"
moduleName = "github.com/google/go-containerregistry"
)
type userAgentTransport struct {
inner http.RoundTripper
ua string
}
func init() {
if v := version(); v != "" {
ggcrVersion = fmt.Sprintf("%s/%s", defaultUserAgent, v)
}
}
func version() string {
if Version != "" {
// Version was set via ldflags, just return it.
return Version
}
info, ok := debug.ReadBuildInfo()
if !ok {
return ""
}
// Happens for crane and gcrane.
if info.Main.Path == moduleName {
return info.Main.Version
}
// Anything else.
for _, dep := range info.Deps {
if dep.Path == moduleName {
return dep.Version
}
}
return ""
}
// NewUserAgent returns an http.Roundtripper that sets the user agent to
// The provided string plus additional go-containerregistry information,
// e.g. if provided "crane/v0.1.4" and this modules was built at v0.1.4:
//
// User-Agent: crane/v0.1.4 go-containerregistry/v0.1.4
func NewUserAgent(inner http.RoundTripper, ua string) http.RoundTripper {
if ua == "" {
ua = ggcrVersion
} else {
ua = fmt.Sprintf("%s %s", ua, ggcrVersion)
}
return &userAgentTransport{
inner: inner,
ua: ua,
}
}
// RoundTrip implements http.RoundTripper
func (ut *userAgentTransport) RoundTrip(in *http.Request) (*http.Response, error) {
in.Header.Set("User-Agent", ut.ua)
return ut.inner.RoundTrip(in)
}
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