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// Copyright 2017 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 grpcproxy
import (
"context"
"go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
)
func getAuthTokenFromClient(ctx context.Context) string {
md, ok := metadata.FromIncomingContext(ctx)
if ok {
ts, ok := md[rpctypes.TokenFieldNameGRPC]
if ok {
return ts[0]
}
}
return ""
}
func withClientAuthToken(ctx, ctxWithToken context.Context) context.Context {
token := getAuthTokenFromClient(ctxWithToken)
if token != "" {
ctx = context.WithValue(ctx, rpctypes.TokenFieldNameGRPC, token)
}
return ctx
}
type proxyTokenCredential struct {
token string
}
func (cred *proxyTokenCredential) RequireTransportSecurity() bool {
return false
}
func (cred *proxyTokenCredential) GetRequestMetadata(ctx context.Context, s ...string) (map[string]string, error) {
return map[string]string{
rpctypes.TokenFieldNameGRPC: cred.token,
}, nil
}
func AuthUnaryClientInterceptor(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
token := getAuthTokenFromClient(ctx)
if token != "" {
tokenCred := &proxyTokenCredential{token}
opts = append(opts, grpc.PerRPCCredentials(tokenCred))
}
return invoker(ctx, method, req, reply, cc, opts...)
}
func AuthStreamClientInterceptor(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
tokenif := ctx.Value(rpctypes.TokenFieldNameGRPC)
if tokenif != nil {
tokenCred := &proxyTokenCredential{tokenif.(string)}
opts = append(opts, grpc.PerRPCCredentials(tokenCred))
}
return streamer(ctx, desc, cc, method, opts...)
}
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