50 lines
1.0 KiB
Go
50 lines
1.0 KiB
Go
package gomail
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import (
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"bytes"
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"errors"
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"fmt"
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"net/smtp"
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)
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// loginAuth is an smtp.Auth that implements the LOGIN authentication mechanism.
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type loginAuth struct {
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username string
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password string
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host string
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}
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func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
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if !server.TLS {
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advertised := false
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for _, mechanism := range server.Auth {
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if mechanism == "LOGIN" {
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advertised = true
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break
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}
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}
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if !advertised {
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return "", nil, errors.New("gomail: unencrypted connection")
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}
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}
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if server.Name != a.host {
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return "", nil, errors.New("gomail: wrong host name")
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}
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return "LOGIN", nil, nil
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}
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func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
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if !more {
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return nil, nil
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}
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switch {
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case bytes.Equal(fromServer, []byte("Username:")):
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return []byte(a.username), nil
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case bytes.Equal(fromServer, []byte("Password:")):
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return []byte(a.password), nil
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default:
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return nil, fmt.Errorf("gomail: unexpected server challenge: %s", fromServer)
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}
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}
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