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108 lines
3.5 KiB
108 lines
3.5 KiB
/* |
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* |
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* Copyright 2018 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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// The server demonstrates how to consume and validate OAuth2 tokens provided by |
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// clients for each RPC. |
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package main |
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import ( |
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"context" |
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"crypto/tls" |
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"log" |
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"net" |
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"strings" |
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"google.golang.org/grpc" |
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"google.golang.org/grpc/codes" |
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"google.golang.org/grpc/credentials" |
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pb "google.golang.org/grpc/examples/helloworld/helloworld" |
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"google.golang.org/grpc/metadata" |
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"google.golang.org/grpc/status" |
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"google.golang.org/grpc/testdata" |
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) |
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var ( |
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errMissingMetadata = status.Errorf(codes.InvalidArgument, "missing metadata") |
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errInvalidToken = status.Errorf(codes.Unauthenticated, "invalid token") |
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) |
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func main() { |
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log.Println("server starting on port 8080...") |
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cert, err := tls.LoadX509KeyPair(testdata.Path("server1.pem"), testdata.Path("server1.key")) |
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if err != nil { |
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log.Fatalf("failed to load key pair: %s", err) |
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} |
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opts := []grpc.ServerOption{ |
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// The following grpc.ServerOption adds an interceptor for all unary |
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// RPCs. To configure an interceptor for streaming RPCs, see: |
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// https://godoc.org/google.golang.org/grpc#StreamInterceptor |
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grpc.UnaryInterceptor(ensureValidToken), |
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// Enable TLS for all incoming connections. |
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grpc.Creds(credentials.NewServerTLSFromCert(&cert)), |
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} |
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s := grpc.NewServer(opts...) |
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pb.RegisterGreeterServer(s, &server{}) |
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lis, err := net.Listen("tcp", ":8080") |
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if err != nil { |
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log.Fatalf("failed to listen: %v", err) |
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} |
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if err := s.Serve(lis); err != nil { |
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log.Fatalf("failed to serve: %v", err) |
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} |
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} |
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// server is used to implement helloworld.GreeterServer. |
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type server struct{} |
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// SayHello implements helloworld.GreeterServer |
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func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) { |
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return &pb.HelloReply{Message: "Hello " + in.Name}, nil |
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} |
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// valid validates the authorization. |
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func valid(authorization []string) bool { |
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if len(authorization) < 1 { |
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return false |
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} |
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token := strings.TrimPrefix(authorization[0], "Bearer ") |
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// Perform the token validation here. For the sake of this example, the code |
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// here forgoes any of the usual OAuth2 token validation and instead checks |
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// for a token matching an arbitrary string. |
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if token != "some-secret-token" { |
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return false |
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} |
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return true |
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} |
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// ensureValidToken ensures a valid token exists within a request's metadata. If |
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// the token is missing or invalid, the interceptor blocks execution of the |
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// handler and returns an error. Otherwise, the interceptor invokes the unary |
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// handler. |
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func ensureValidToken(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) { |
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md, ok := metadata.FromIncomingContext(ctx) |
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if !ok { |
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return nil, errMissingMetadata |
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} |
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// The keys within metadata.MD are normalized to lowercase. |
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// See: https://godoc.org/google.golang.org/grpc/metadata#New |
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if !valid(md["authorization"]) { |
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return nil, errInvalidToken |
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} |
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// Continue execution of handler after ensuring a valid token. |
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return handler(ctx, req) |
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}
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