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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Orange. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.so.security;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import com.google.common.collect.ImmutableSet;
/**
* @author Sheel Bajpai (sheel.bajpai@orange.com)
*
*/
public class HttpHeaderForwarderHandlerInterceptor extends HandlerInterceptorAdapter {
private static final ThreadLocal<Map<String, List<String>>> HEADERS_THREAD_LOCAL = new ThreadLocal<>();
private static final Set<String> FORWARDED_HEADER_NAMES = ImmutableSet.of("authorization", "x-request-id",
"x-b3-traceid", "x-b3-spanid", "x-b3-parentspanid", "x-b3-sampled", "x-b3-flags", "x-ot-span-context");
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
Map<String, List<String>> headerMap = Collections.list(request.getHeaderNames()).stream()
.map(String::toLowerCase).filter(FORWARDED_HEADER_NAMES::contains)
.collect(Collectors.toMap(Function.identity(), h -> Collections.list(request.getHeaders(h))));
HEADERS_THREAD_LOCAL.set(headerMap);
return super.preHandle(request, response, handler);
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
HEADERS_THREAD_LOCAL.remove();
}
static Map<String, List<String>> getHeaders() {
return HEADERS_THREAD_LOCAL.get();
}
}
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