/
AuthClient.java
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/
AuthClient.java
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/*
* Copyright 2018 The gRPC 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 io.grpc.examples.authentication;
import io.grpc.CallCredentials;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.examples.helloworld.GreeterGrpc;
import io.grpc.examples.helloworld.HelloReply;
import io.grpc.examples.helloworld.HelloRequest;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* An authenticating client that requests a greeting from the {@link AuthServer}.
*/
public class AuthClient {
private static final Logger logger = Logger.getLogger(AuthClient.class.getName());
private final ManagedChannel channel;
private final GreeterGrpc.GreeterBlockingStub blockingStub;
/**
* Construct client for accessing GreeterGrpc server.
*/
AuthClient(String host, int port) {
this(ManagedChannelBuilder
.forAddress(host, port)
// Channels are secure by default (via SSL/TLS). For this example we disable TLS to avoid
// needing certificates, but it is recommended to use a secure channel while passing
// credentials.
.usePlaintext()
.build());
}
/**
* Construct client for accessing GreeterGrpc server using the existing channel.
*/
AuthClient(ManagedChannel channel) {
this.channel = channel;
this.blockingStub = GreeterGrpc.newBlockingStub(channel);
}
public void shutdown() throws InterruptedException {
channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
}
/**
* Say hello to server.
*
* @param name name to set in HelloRequest
* @param clientId client identifier to set in JWT subject
* @return the message in the HelloReply from the server
*/
public String greet(String name, String clientId) {
logger.info("Will try to greet " + name + " ...");
HelloRequest request = HelloRequest.newBuilder().setName(name).build();
String jwt = getJwt(clientId); // build JWT
CallCredentials credentials = new BearerToken(jwt); // Wrap JWT in CallCredentials
HelloReply response = blockingStub
.withCallCredentials(credentials) // get a new stub that uses the given call credentials
.sayHello(request); // and call the server using it
logger.info("Greeting: " + response.getMessage());
return response.getMessage();
}
private static String getJwt(String clientId) {
return Jwts.builder()
.setSubject(clientId)
.signWith(SignatureAlgorithm.HS256, Constant.JWT_SIGNING_KEY)
.compact();
}
/**
* Greet server. If provided, the first element of {@code args} is the name to use in the greeting
* and the second is the client identifier to set in JWT
*/
public static void main(String[] args) throws Exception {
AuthClient client = new AuthClient("localhost", 50051);
try {
String user = "world";
String clientId = "default-client";
if (args.length > 0) {
user = args[0]; // Use the arg as the name to greet if provided
}
if (args.length > 1) {
clientId = args[1]; // Use the second argument as the client identifier if provided
}
client.greet(user, clientId);
} finally {
client.shutdown();
}
}
}