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transport.go
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transport.go
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// Copyright (c) 2021 The Jaeger 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 bearertoken
import (
"errors"
"net/http"
)
// RoundTripper wraps another http.RoundTripper and injects
// an authentication header with bearer token into requests.
type RoundTripper struct {
// Transport is the underlying http.RoundTripper being wrapped. Required.
Transport http.RoundTripper
// StaticToken is the pre-configured bearer token. Optional.
StaticToken string
// OverrideFromCtx enables reading bearer token from Context.
OverrideFromCtx bool
}
// RoundTrip injects the outbound Authorization header with the
// token provided in the inbound request.
func (tr RoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
if tr.Transport == nil {
return nil, errors.New("no http.RoundTripper provided")
}
token := tr.StaticToken
if tr.OverrideFromCtx {
headerToken, _ := GetBearerToken(r.Context())
if headerToken != "" {
token = headerToken
}
}
if token != "" {
r.Header.Set("Authorization", "Bearer "+token)
}
return tr.Transport.RoundTrip(r)
}