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/*-
* ============LICENSE_START=======================================================
* VID
* ================================================================================
* Copyright (C) 2017 - 2019 AT&T Intellectual Property. 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.
* ============LICENSE_END=========================================================
*/
package org.onap.vid.controller.filter;
import static org.onap.portalsdk.core.util.SystemProperties.ECOMP_REQUEST_ID;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.UUID;
import java.util.regex.Pattern;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.filter.GenericFilterBean;
@WebFilter(urlPatterns = "/*")
public class PromiseRequestIdFilter extends GenericFilterBean {
private static final String REQUEST_ID_RESPONSE_HEADER = ECOMP_REQUEST_ID + "-echo";
private static final Pattern uuidRegex = Pattern.compile("[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}");
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (request instanceof HttpServletRequest) {
request = wrapIfNeeded(request);
if (response instanceof HttpServletResponse) {
final String actualRequestId = ((HttpServletRequest) request).getHeader(ECOMP_REQUEST_ID);
((HttpServletResponse) response).addHeader(REQUEST_ID_RESPONSE_HEADER, actualRequestId);
}
}
chain.doFilter(request, response);
}
public ServletRequest wrapIfNeeded(ServletRequest request) {
final HttpServletRequest httpRequest = (HttpServletRequest) request;
final String originalRequestId = incomingRequestId(httpRequest);
if (isWrapNeeded(originalRequestId)) {
request = new PromiseRequestIdRequestWrapper(httpRequest);
}
return request;
}
private boolean verifyAndValidateUuid(String value) {
return uuidRegex.matcher(value).matches();
}
protected boolean isWrapNeeded(String originalRequestId) {
return StringUtils.isEmpty(originalRequestId)
|| !verifyAndValidateUuid(originalRequestId);
}
protected String incomingRequestId(HttpServletRequest httpRequest) {
return httpRequest.getHeader(ECOMP_REQUEST_ID);
}
private static class PromiseRequestIdRequestWrapper extends HttpServletRequestWrapper {
private final UUID requestId;
PromiseRequestIdRequestWrapper(HttpServletRequest request) {
super(request);
requestId = UUID.randomUUID();
}
@Override
public String getHeader(String name) {
return isRequestIdHeaderName(name) ?
requestId.toString() : super.getHeader(name);
}
@Override
public Enumeration<String> getHeaders(String name) {
if (isRequestIdHeaderName(name)) {
return Collections.enumeration(Collections.singleton(requestId.toString()));
} else {
return super.getHeaders(name);
}
}
@Override
public Enumeration<String> getHeaderNames() {
if (null == super.getHeader(ECOMP_REQUEST_ID)) {
return Collections.enumeration(ImmutableList.<String>builder()
.add(ECOMP_REQUEST_ID)
.addAll(Collections.list(super.getHeaderNames()))
.build());
}
return super.getHeaderNames();
}
private boolean isRequestIdHeaderName(String name) {
return ECOMP_REQUEST_ID.equalsIgnoreCase(name);
}
}
}
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