/*
 * Copyright 2017 The Mifos Initiative.
 *
 * 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.mifos.core.api.util;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.web.bind.annotation.RequestMethod;

import java.nio.charset.Charset;

/**
 * Sets the content length of a request to zero if the request is of type POST or PUT, and contains
 * no request body.
 */
public class EmptyBodyInterceptor implements RequestInterceptor {

  EmptyBodyInterceptor() {
    super();
  }

  @Override
  public void apply(final RequestTemplate template) {
    if ((template.method().equalsIgnoreCase(RequestMethod.POST.name())
        || template.method().equalsIgnoreCase(RequestMethod.PUT.name()))
        && template.body() == null) {
      template.body(new byte[0], Charset.defaultCharset());
    }
  }
}