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package responses
import (
"encoding/base64"
"github.com/emersion/go-imap"
"github.com/emersion/go-sasl"
)
// An AUTHENTICATE response.
type Authenticate struct {
Mechanism sasl.Client
InitialResponse []byte
RepliesCh chan []byte
}
// Implements
func (r *Authenticate) Replies() <-chan []byte {
return r.RepliesCh
}
func (r *Authenticate) writeLine(l string) error {
r.RepliesCh <- []byte(l + "\r\n")
return nil
}
func (r *Authenticate) cancel() error {
return r.writeLine("*")
}
func (r *Authenticate) Handle(resp imap.Resp) error {
cont, ok := resp.(*imap.ContinuationReq)
if !ok {
return ErrUnhandled
}
// Empty challenge, send initial response as stated in RFC 2222 section 5.1
if cont.Info == "" && r.InitialResponse != nil {
encoded := base64.StdEncoding.EncodeToString(r.InitialResponse)
if err := r.writeLine(encoded); err != nil {
return err
}
r.InitialResponse = nil
return nil
}
challenge, err := base64.StdEncoding.DecodeString(cont.Info)
if err != nil {
r.cancel()
return err
}
reply, err := r.Mechanism.Next(challenge)
if err != nil {
r.cancel()
return err
}
encoded := base64.StdEncoding.EncodeToString(reply)
return r.writeLine(encoded)
}
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