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package smtp
import (
"net/smtp"
)
type oauth2Auth struct {
username, accessToken string
}
// OAuth2Auth returns an Auth that implements the SASL XOAUTH2 authentication
// as per https://developers.google.com/gmail/imap/xoauth2-protocol.
// It assumes the provided password is a valid OAuth2 access token.
// Token refresh or complex challenge-response flows are not supported.
func OAuth2Auth(username, accessToken string) smtp.Auth {
return &oauth2Auth{username, accessToken}
}
func (a *oauth2Auth) Start(_ *smtp.ServerInfo) (string, []byte, error) {
resp := []byte("user=" + a.username + "\x01auth=Bearer " + a.accessToken + "\x01\x01")
return "XOAUTH2", resp, nil
}
func (a *oauth2Auth) Next(_ []byte, _ bool) ([]byte, error) {
return nil, nil
}
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