cubefs

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/*
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 *
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 * Copyright 2020 gRPC authors.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 */
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package credentials
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import "crypto/tls"
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const alpnProtoStrH2 = "h2"
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// AppendH2ToNextProtos appends h2 to next protos.
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func AppendH2ToNextProtos(ps []string) []string {
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	for _, p := range ps {
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		if p == alpnProtoStrH2 {
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			return ps
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		}
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	}
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	ret := make([]string, 0, len(ps)+1)
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	ret = append(ret, ps...)
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	return append(ret, alpnProtoStrH2)
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}
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// CloneTLSConfig returns a shallow clone of the exported
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// fields of cfg, ignoring the unexported sync.Once, which
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// contains a mutex and must not be copied.
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//
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// If cfg is nil, a new zero tls.Config is returned.
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//
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// TODO: inline this function if possible.
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func CloneTLSConfig(cfg *tls.Config) *tls.Config {
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	if cfg == nil {
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		return &tls.Config{}
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	}
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	return cfg.Clone()
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}
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