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rt.go
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rt.go
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// Copyright 2017 The LUCI 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 service
import (
"net/http"
"strings"
commonAuth "go.chromium.org/luci/auth"
)
type serviceModifyingTransport struct {
userAgent string
}
func (smt *serviceModifyingTransport) roundTripper(base http.RoundTripper) http.RoundTripper {
if base == nil {
base = http.DefaultTransport
}
return commonAuth.NewModifyingTransport(base, func(req *http.Request) error {
// Set a user agent based on our service. If an existing user agent is
// specified, add it onto the end of the string.
parts := make([]string, 0, 2)
for _, part := range []string{
smt.userAgent,
req.UserAgent(),
} {
if part != "" {
parts = append(parts, part)
}
}
if len(parts) > 0 {
req.Header.Set("User-Agent", strings.Join(parts, " / "))
}
return nil
})
}