vendor dependencies with dep

vendor/gopkg.in/gomail.v2/auth.go

@@ -0,0 +1,67 @@
+package gomail
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"net/smtp"
+)
+
+// plainAuth is an smtp.Auth that implements the PLAIN authentication mechanism.
+// It fallbacks to the LOGIN mechanism if it is the only mechanism advertised
+// by the server.
+type plainAuth struct {
+	username string
+	password string
+	host     string
+	login    bool
+}
+
+func (a *plainAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
+	if server.Name != a.host {
+		return "", nil, errors.New("gomail: wrong host name")
+	}
+
+	var plain, login bool
+	for _, a := range server.Auth {
+		switch a {
+		case "PLAIN":
+			plain = true
+		case "LOGIN":
+			login = true
+		}
+	}
+
+	if !server.TLS && !plain && !login {
+		return "", nil, errors.New("gomail: unencrypted connection")
+	}
+
+	if !plain && login {
+		a.login = true
+		return "LOGIN", nil, nil
+	}
+
+	return "PLAIN", []byte("\x00" + a.username + "\x00" + a.password), nil
+}
+
+func (a *plainAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+	if !a.login {
+		if more {
+			return nil, errors.New("gomail: unexpected server challenge")
+		}
+		return nil, nil
+	}
+
+	if !more {
+		return nil, nil
+	}
+
+	switch {
+	case bytes.Equal(fromServer, []byte("Username:")):
+		return []byte(a.username), nil
+	case bytes.Equal(fromServer, []byte("Password:")):
+		return []byte(a.password), nil
+	default:
+		return nil, fmt.Errorf("gomail: unexpected server challenge: %s", fromServer)
+	}
+}