2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 - 2019 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.vid.controller.filter;
24 import static org.apache.commons.lang3.ObjectUtils.defaultIfNull;
25 import static org.apache.commons.lang3.StringUtils.isNotEmpty;
26 import static org.onap.portalsdk.core.util.SystemProperties.ECOMP_REQUEST_ID;
28 import com.google.common.collect.ImmutableList;
29 import java.io.IOException;
30 import java.util.Collections;
31 import java.util.Enumeration;
32 import java.util.UUID;
33 import java.util.function.Supplier;
34 import java.util.regex.Pattern;
35 import javax.servlet.FilterChain;
36 import javax.servlet.ServletException;
37 import javax.servlet.ServletRequest;
38 import javax.servlet.ServletResponse;
39 import javax.servlet.annotation.WebFilter;
40 import javax.servlet.http.HttpServletRequest;
41 import javax.servlet.http.HttpServletRequestWrapper;
42 import javax.servlet.http.HttpServletResponse;
43 import javax.validation.constraints.NotNull;
44 import org.onap.vid.logging.Headers;
45 import org.onap.vid.logging.RequestIdHeader;
46 import org.springframework.web.filter.GenericFilterBean;
48 @WebFilter(urlPatterns = "/*")
49 public class PromiseRequestIdFilter extends GenericFilterBean {
51 // The wrapped request is guaranteed to have the transaction id as the value
52 // of the header PROMISED_HEADER_NAME.
53 // PROMISED_HEADER_NAME is set to ECOMP_REQUEST_ID as long as
54 // org.onap.portalsdk...UserUtils.getRequestId() is using the header
55 // "X-ECOMP-RequestID".
56 private static final RequestIdHeader PROMISED_HEADER = RequestIdHeader.ECOMP_ID;
57 private static final String REQUEST_ID_RESPONSE_HEADER = ECOMP_REQUEST_ID + "-echo";
59 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}", Pattern.CASE_INSENSITIVE);
62 public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
63 throws IOException, ServletException {
65 if (request instanceof HttpServletRequest) {
66 request = wrapIfNeeded(request);
68 if (response instanceof HttpServletResponse) {
69 final String actualRequestId = PROMISED_HEADER.getHeaderValue((HttpServletRequest) request);
70 ((HttpServletResponse) response).addHeader(REQUEST_ID_RESPONSE_HEADER, actualRequestId);
74 chain.doFilter(request, response);
77 public ServletRequest wrapIfNeeded(ServletRequest request) {
78 final HttpServletRequest httpRequest = (HttpServletRequest) request;
80 final RequestIdHeader highestPriorityHeader = highestPriorityHeader(httpRequest);
81 final String originalRequestId = highestPriorityHeader.getHeaderValue(httpRequest);
83 if (isWrapNeeded(highestPriorityHeader, originalRequestId)) {
84 // Copy originalRequestId to the promised header value
85 request = new PromiseRequestIdRequestWrapper(httpRequest, toUuidOrElse(originalRequestId, UUID::randomUUID));
91 private boolean verifyAndValidateUuid(String value) {
92 return isNotEmpty(value) && uuidRegex.matcher(value).matches();
95 private boolean isWrapNeeded(RequestIdHeader highestPriorityHeader, String originalRequestId) {
96 boolean headerExistsAndValid =
97 PROMISED_HEADER == highestPriorityHeader && verifyAndValidateUuid(originalRequestId);
99 return !headerExistsAndValid;
102 UUID toUuidOrElse(String uuid, Supplier<UUID> uuidSupplier) {
103 if (verifyAndValidateUuid(uuid)) {
105 return UUID.fromString(uuid);
106 } catch (IllegalArgumentException e) {
107 return uuidSupplier.get();
110 return uuidSupplier.get();
114 RequestIdHeader highestPriorityHeader(HttpServletRequest httpRequest) {
115 return defaultIfNull(Headers.highestPriorityHeader(httpRequest), PROMISED_HEADER);
118 private static class PromiseRequestIdRequestWrapper extends HttpServletRequestWrapper {
120 private final UUID requestId;
122 PromiseRequestIdRequestWrapper(HttpServletRequest request, @NotNull UUID requestId) {
124 this.requestId = requestId;
128 public String getHeader(String name) {
129 return isRequestIdHeaderName(name) ?
130 requestId.toString() : super.getHeader(name);
134 public Enumeration<String> getHeaders(String name) {
135 if (isRequestIdHeaderName(name)) {
136 return Collections.enumeration(Collections.singleton(requestId.toString()));
138 return super.getHeaders(name);
143 public Enumeration<String> getHeaderNames() {
145 if (null == super.getHeader(PROMISED_HEADER.getHeaderName())) {
146 return Collections.enumeration(ImmutableList.<String>builder()
147 .add(PROMISED_HEADER.getHeaderName())
148 .addAll(Collections.list(super.getHeaderNames()))
152 return super.getHeaderNames();
155 private boolean isRequestIdHeaderName(String name) {
156 return PROMISED_HEADER.stringEquals(name);