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basic.go
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basic.go
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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 transport
import (
"net/http"
"github.com/aaron-prindle/go-containerregistry/pkg/authn"
)
type basicTransport struct {
inner http.RoundTripper
auth authn.Authenticator
target string
}
var _ http.RoundTripper = (*basicTransport)(nil)
// RoundTrip implements http.RoundTripper
func (bt *basicTransport) RoundTrip(in *http.Request) (*http.Response, error) {
hdr, err := bt.auth.Authorization()
if err != nil {
return nil, err
}
// http.Client handles redirects at a layer above the http.RoundTripper
// abstraction, so to avoid forwarding Authorization headers to places
// we are redirected, only set it when the authorization header matches
// the host with which we are interacting.
// In case of redirect http.Client can use an empty Host, check URL too.
if in.Host == bt.target || in.URL.Host == bt.target {
in.Header.Set("Authorization", hdr)
}
in.Header.Set("User-Agent", transportName)
return bt.inner.RoundTrip(in)
}