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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package stsexchange
import (
"encoding/base64"
"net/http"
"net/url"
"golang.org/x/oauth2"
)
// ClientAuthentication represents an OAuth client ID and secret and the mechanism for passing these credentials as stated in rfc6749#2.3.1.
type ClientAuthentication struct {
// AuthStyle can be either basic or request-body
AuthStyle oauth2.AuthStyle
ClientID string
ClientSecret string
}
// InjectAuthentication is used to add authentication to a Secure Token Service exchange
// request. It modifies either the passed url.Values or http.Header depending on the desired
// authentication format.
func (c *ClientAuthentication) InjectAuthentication(values url.Values, headers http.Header) {
if c.ClientID == "" || c.ClientSecret == "" || values == nil || headers == nil {
return
}
switch c.AuthStyle {
case oauth2.AuthStyleInHeader: // AuthStyleInHeader corresponds to basic authentication as defined in rfc7617#2
plainHeader := c.ClientID + ":" + c.ClientSecret
headers.Add("Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(plainHeader)))
case oauth2.AuthStyleInParams: // AuthStyleInParams corresponds to request-body authentication with ClientID and ClientSecret in the message body.
values.Set("client_id", c.ClientID)
values.Set("client_secret", c.ClientSecret)
case oauth2.AuthStyleAutoDetect:
values.Set("client_id", c.ClientID)
values.Set("client_secret", c.ClientSecret)
default:
values.Set("client_id", c.ClientID)
values.Set("client_secret", c.ClientSecret)
}
}
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