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// Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package transport contains HTTP transports used to make
// authenticated API requests.
package transport
import (
"errors"
"net/http"
)
// APIKey is an HTTP Transport which wraps an underlying transport and
// appends an API Key "key" parameter to the URL of outgoing requests.
type APIKey struct {
// Key is the API Key to set on requests.
Key string
// Transport is the underlying HTTP transport.
// If nil, http.DefaultTransport is used.
Transport http.RoundTripper
}
func (t *APIKey) RoundTrip(req *http.Request) (*http.Response, error) {
rt := t.Transport
if rt == nil {
rt = http.DefaultTransport
if rt == nil {
return nil, errors.New("googleapi/transport: no Transport specified or available")
}
}
newReq := *req
args := newReq.URL.Query()
args.Set("key", t.Key)
newReq.URL.RawQuery = args.Encode()
return rt.RoundTrip(&newReq)
}
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