com.tigrisdata.db.client.AuthHeaderInterceptor Maven / Gradle / Ivy

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/*
 * Copyright 2022 Tigris Data, Inc.
 *
 * 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 com.tigrisdata.db.client;

import com.tigrisdata.db.client.auth.AuthorizationToken;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.ForwardingClientCallListener;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;

class AuthHeaderInterceptor implements ClientInterceptor {
  private static final Metadata.Key AUTH_HEADER_KEY =
      Metadata.Key.of("authorization", Metadata.ASCII_STRING_MARSHALLER);

  private final AuthorizationToken authorizationToken;

  public AuthHeaderInterceptor(AuthorizationToken authorizationToken) {
    this.authorizationToken = authorizationToken;
  }

  @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(AUTH_HEADER_KEY, authorizationToken.getAuthorizationToken());
        super.start(
            new ForwardingClientCallListener.SimpleForwardingClientCallListener(
                responseListener) {},
            headers);
      }
    };
  }
}