Initialize module and dependencies

vendor/github.com/emersion/go-sasl/login.go

@@ -0,0 +1,38 @@
+package sasl
+
+import (
+	"bytes"
+)
+
+// The LOGIN mechanism name.
+const Login = "LOGIN"
+
+var expectedChallenge = []byte("Password:")
+
+type loginClient struct {
+	Username string
+	Password string
+}
+
+func (a *loginClient) Start() (mech string, ir []byte, err error) {
+	mech = "LOGIN"
+	ir = []byte(a.Username)
+	return
+}
+
+func (a *loginClient) Next(challenge []byte) (response []byte, err error) {
+	if bytes.Compare(challenge, expectedChallenge) != 0 {
+		return nil, ErrUnexpectedServerChallenge
+	} else {
+		return []byte(a.Password), nil
+	}
+}
+
+// A client implementation of the LOGIN authentication mechanism for SMTP,
+// as described in http://www.iana.org/go/draft-murchison-sasl-login
+//
+// It is considered obsolete, and should not be used when other mechanisms are
+// available. For plaintext password authentication use PLAIN mechanism.
+func NewLoginClient(username, password string) Client {
+	return &loginClient{username, password}
+}