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/*
*
* Copyright 2020 gRPC 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 credentials
import (
"crypto/tls"
)
const alpnProtoStrH2 = "h2"
// AppendH2ToNextProtos appends h2 to next protos.
func AppendH2ToNextProtos(ps []string) []string {
for _, p := range ps {
if p == alpnProtoStrH2 {
return ps
}
}
ret := make([]string, 0, len(ps)+1)
ret = append(ret, ps...)
return append(ret, alpnProtoStrH2)
}
// CloneTLSConfig returns a shallow clone of the exported
// fields of cfg, ignoring the unexported sync.Once, which
// contains a mutex and must not be copied.
//
// If cfg is nil, a new zero tls.Config is returned.
//
// TODO: inline this function if possible.
func CloneTLSConfig(cfg *tls.Config) *tls.Config {
if cfg == nil {
return &tls.Config{}
}
return cfg.Clone()
}
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