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// Copyright 2023 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tlsutil
import (
"crypto/tls"
"fmt"
)
type TLSVersion string
// Constants for TLS versions.
const (
TLSVersionDefault TLSVersion = ""
TLSVersion12 TLSVersion = "TLS1.2"
TLSVersion13 TLSVersion = "TLS1.3"
)
// GetTLSVersion returns the corresponding tls.Version or error.
func GetTLSVersion(version string) (uint16, error) {
var v uint16
switch version {
case string(TLSVersionDefault):
v = 0 // 0 means let Go decide.
case string(TLSVersion12):
v = tls.VersionTLS12
case string(TLSVersion13):
v = tls.VersionTLS13
default:
return 0, fmt.Errorf("unexpected TLS version %q (must be one of: TLS1.2, TLS1.3)", version)
}
return v, nil
}
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