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A client-side Java library to interact with Scalar DL network.

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/*
 * This file is part of the Scalar DL client SDK.
 * Copyright (c) 2019 Scalar, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. For more information, please contact Scalar, Inc.
 */
package com.scalar.dl.client.rpc;

import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;

public class AuthorizationInterceptor implements ClientInterceptor {
  private static final String KEY = "authorization";
  private final String token;

  public AuthorizationInterceptor(String token) {
    this.token = token;
  }

  @Override
  public  ClientCall interceptCall(
      MethodDescriptor methodDescriptor, CallOptions callOptions, Channel channel) {
    return new ForwardingClientCall.SimpleForwardingClientCall(
        channel.newCall(methodDescriptor, callOptions)) {
      @Override
      public void start(Listener responseListener, Metadata headers) {
        headers.put(Metadata.Key.of(KEY, Metadata.ASCII_STRING_MARSHALLER), token);
        super.start(responseListener, headers);
      }
    };
  }
}