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// Library for Simple Authentication and Security Layer (SASL) defined in RFC 4422.
package sasl
// Note:
// Most of this code was copied, with some modifications, from net/smtp. It
// would be better if Go provided a standard package (e.g. crypto/sasl) that
// could be shared by SMTP, IMAP, and other packages.
import (
"errors"
)
// Common SASL errors.
var (
ErrUnexpectedClientResponse = errors.New("sasl: unexpected client response")
ErrUnexpectedServerChallenge = errors.New("sasl: unexpected server challenge")
)
// Client interface to perform challenge-response authentication.
type Client interface {
// Begins SASL authentication with the server. It returns the
// authentication mechanism name and "initial response" data (if required by
// the selected mechanism). A non-nil error causes the client to abort the
// authentication attempt.
//
// A nil ir value is different from a zero-length value. The nil value
// indicates that the selected mechanism does not use an initial response,
// while a zero-length value indicates an empty initial response, which must
// be sent to the server.
Start() (mech string, ir []byte, err error)
// Continues challenge-response authentication. A non-nil error causes
// the client to abort the authentication attempt.
Next(challenge []byte) (response []byte, err error)
}
// Server interface to perform challenge-response authentication.
type Server interface {
// Begins or continues challenge-response authentication. If the client
// supplies an initial response, response is non-nil.
//
// If the authentication is finished, done is set to true. If the
// authentication has failed, an error is returned.
Next(response []byte) (challenge []byte, done bool, err error)
}
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