BasicAuthInterceptor.java

/**
 * Copyright 2015-2017 The OpenZipkin 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 zipkin.autoconfigure.storage.elasticsearch.http;

import com.squareup.moshi.JsonReader;
import okhttp3.Credentials;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

import java.io.IOException;

import static zipkin.moshi.JsonReaders.enterPath;

/*
adds basic auth username and password to every request per
https://www.elastic.co/guide/en/x-pack/current/how-security-works.html
*/
final public class BasicAuthInterceptor implements Interceptor {

  private String basicCredentials;

  BasicAuthInterceptor(ZipkinElasticsearchHttpStorageProperties es) {
    basicCredentials = Credentials.basic(es.getUsername(), es.getPassword());
  }

  @Override
  public Response intercept(Chain chain) throws IOException {

    Request input = chain.request();
    Request requestWithCredentials = appendBasicAuthHeaderParameters(input);
    Response response = chain.proceed(requestWithCredentials);
    if (response.code() == 403) {
      try (ResponseBody body = response.body()) {
        JsonReader message = enterPath(JsonReader.of(body.source()), "message");
        if (message != null) throw new IllegalStateException(message.nextString());
      }
      throw new IllegalStateException(response.toString());
    }
    return response;
  }

  private Request appendBasicAuthHeaderParameters(Request input) throws IOException {

    Request.Builder builder = input.newBuilder();
    return builder.header("authorization", basicCredentials).build();
  }
}