| // 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" |
| |
| "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["token"] |
| if ok { |
| return ts[0] |
| } |
| } |
| return "" |
| } |
| |
| func withClientAuthToken(ctx context.Context, ctxWithToken context.Context) context.Context { |
| token := getAuthTokenFromClient(ctxWithToken) |
| if token != "" { |
| ctx = context.WithValue(ctx, "token", 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{ |
| "token": 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("token") |
| if tokenif != nil { |
| tokenCred := &proxyTokenCredential{tokenif.(string)} |
| opts = append(opts, grpc.PerRPCCredentials(tokenCred)) |
| } |
| return streamer(ctx, desc, cc, method, opts...) |
| } |