sslobodr | d046be8 | 2019-01-16 10:02:22 -0500 | [diff] [blame] | 1 | // Copyright 2017 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package grpcproxy |
| 16 | |
| 17 | import ( |
| 18 | "context" |
| 19 | |
| 20 | "google.golang.org/grpc" |
| 21 | "google.golang.org/grpc/metadata" |
| 22 | ) |
| 23 | |
| 24 | func getAuthTokenFromClient(ctx context.Context) string { |
| 25 | md, ok := metadata.FromIncomingContext(ctx) |
| 26 | if ok { |
| 27 | ts, ok := md["token"] |
| 28 | if ok { |
| 29 | return ts[0] |
| 30 | } |
| 31 | } |
| 32 | return "" |
| 33 | } |
| 34 | |
| 35 | func withClientAuthToken(ctx context.Context, ctxWithToken context.Context) context.Context { |
| 36 | token := getAuthTokenFromClient(ctxWithToken) |
| 37 | if token != "" { |
| 38 | ctx = context.WithValue(ctx, "token", token) |
| 39 | } |
| 40 | return ctx |
| 41 | } |
| 42 | |
| 43 | type proxyTokenCredential struct { |
| 44 | token string |
| 45 | } |
| 46 | |
| 47 | func (cred *proxyTokenCredential) RequireTransportSecurity() bool { |
| 48 | return false |
| 49 | } |
| 50 | |
| 51 | func (cred *proxyTokenCredential) GetRequestMetadata(ctx context.Context, s ...string) (map[string]string, error) { |
| 52 | return map[string]string{ |
| 53 | "token": cred.token, |
| 54 | }, nil |
| 55 | } |
| 56 | |
| 57 | func AuthUnaryClientInterceptor(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error { |
| 58 | token := getAuthTokenFromClient(ctx) |
| 59 | if token != "" { |
| 60 | tokenCred := &proxyTokenCredential{token} |
| 61 | opts = append(opts, grpc.PerRPCCredentials(tokenCred)) |
| 62 | } |
| 63 | return invoker(ctx, method, req, reply, cc, opts...) |
| 64 | } |
| 65 | |
| 66 | func AuthStreamClientInterceptor(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) { |
| 67 | tokenif := ctx.Value("token") |
| 68 | if tokenif != nil { |
| 69 | tokenCred := &proxyTokenCredential{tokenif.(string)} |
| 70 | opts = append(opts, grpc.PerRPCCredentials(tokenCred)) |
| 71 | } |
| 72 | return streamer(ctx, desc, cc, method, opts...) |
| 73 | } |