github-advanced-security[bot] commented on code in PR #5544: URL: https://github.com/apache/shenyu/pull/5544#discussion_r1587244489
########## shenyu-admin/src/main/java/org/apache/shenyu/admin/filter/ClusterForwardFilter.java: ########## @@ -0,0 +1,175 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 org.apache.shenyu.admin.filter; + +import org.apache.commons.lang3.StringUtils; +import org.apache.shenyu.admin.config.properties.ClusterProperties; +import org.apache.shenyu.admin.model.dto.ClusterMasterDTO; +import org.apache.shenyu.admin.service.ClusterMasterService; +import org.jetbrains.annotations.NotNull; +import org.owasp.encoder.Encode; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import org.springframework.http.HttpEntity; +import org.springframework.http.HttpHeaders; +import org.springframework.http.HttpMethod; +import org.springframework.http.ResponseEntity; +import org.springframework.http.server.ServletServerHttpRequest; +import org.springframework.stereotype.Component; +import org.springframework.util.AntPathMatcher; +import org.springframework.util.PathMatcher; +import org.springframework.web.client.RestTemplate; +import org.springframework.web.filter.OncePerRequestFilter; +import org.springframework.web.util.UriComponentsBuilder; + +import javax.annotation.Resource; +import javax.servlet.FilterChain; +import javax.servlet.ServletException; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.Writer; +import java.util.Collections; +import java.util.Objects; + +/** + * Cluster forward filter. + */ +@Component +public class ClusterForwardFilter extends OncePerRequestFilter { + + private static final Logger LOG = LoggerFactory.getLogger(ClusterForwardFilter.class); + + private static final PathMatcher PATH_MATCHER = new AntPathMatcher(); + + @Resource + private RestTemplate restTemplate; + + @Resource + private ClusterMasterService clusterMasterService; + + @Resource + private ClusterProperties clusterProperties; + + @Override + protected void doFilterInternal(@NotNull final HttpServletRequest request, + @NotNull final HttpServletResponse response, + @NotNull final FilterChain filterChain) throws ServletException, IOException { + String method = request.getMethod(); + if (StringUtils.equals(HttpMethod.OPTIONS.name(), method)) { + filterChain.doFilter(request, response); + return; + } + + if (clusterMasterService.isMaster()) { + filterChain.doFilter(request, response); + return; + } + + String uri = request.getRequestURI(); + String requestContextPath = request.getContextPath(); + String replaced = uri.replaceAll(requestContextPath, ""); + boolean anyMatch = clusterProperties.getForwardList().stream().anyMatch(x -> PATH_MATCHER.match(x, replaced)); + if (!anyMatch) { + filterChain.doFilter(request, response); + return; + } + + // cluster forward request to master + forwardRequest(request, response, filterChain); + } + + private void forwardRequest(final HttpServletRequest request, + final HttpServletResponse response, + final FilterChain filterChain) throws IOException, ServletException { + ClusterMasterDTO master = clusterMasterService.getMaster(); + String host = master.getMasterHost(); + String port = master.getMasterPort(); + // String contextPath = master.getContextPath(); + + // new URL + // String uri = request.getRequestURI(); + // String requestContextPath = request.getContextPath(); + // uri = uri.replaceAll(requestContextPath, ""); + // if (StringUtils.isNotEmpty(contextPath)) { + // uri = contextPath + "/" + uri; + // } + UriComponentsBuilder builder = UriComponentsBuilder + .fromHttpRequest(new ServletServerHttpRequest(request)) + .host(host) + .port(port); + + // 添加查询参数 + if (StringUtils.isNotEmpty(request.getQueryString())) { + builder.query(request.getQueryString()); + } + + LOG.debug("forwarding request to url: {}", builder.toUriString()); + // Create request entity + HttpHeaders headers = new HttpHeaders(); + + copyHeaders(request, headers); + HttpEntity<byte[]> requestEntity = new HttpEntity<>(getBody(request), headers); + // Send request + ResponseEntity<String> responseEntity = restTemplate.exchange(builder.toUriString(), HttpMethod.valueOf(request.getMethod()), requestEntity, String.class); + + // Set response status and headers + response.setStatus(responseEntity.getStatusCodeValue()); + copyHeaders(responseEntity.getHeaders(), response); + // fix cors error + response.addHeader("Access-Control-Allow-Origin", "*"); + response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE"); + + try (Writer writer = response.getWriter()) { +// writer.write(URLEncoder.encode(Objects.requireNonNull(responseEntity.getBody()), "UTF-8")); + writer.write(Encode.forJava(Objects.requireNonNull(responseEntity.getBody()))); + writer.flush(); + } + + } + + private void copyHeaders(final HttpServletRequest request, final HttpHeaders headers) { + Collections.list(request.getHeaderNames()) + .forEach(headerName -> headers.add(headerName, request.getHeader(headerName).replaceAll("\r", "").replaceAll("\n", ""))); + } + + private void copyHeaders(final HttpHeaders sourceHeaders, final HttpServletResponse response) { + sourceHeaders.forEach((headerName, headerValues) -> { +// String name = headerName.replaceAll("[^a-zA-Z ]", ""); + if (!response.containsHeader(headerName)) { + headerValues.forEach(headerValue -> { + response.addHeader(headerName, headerValue.replaceAll("\r", "").replaceAll("\n", "")); Review Comment: ## HTTP response splitting This header depends on a [user-provided value](1), which may cause a response-splitting vulnerability. 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