| /* |
| * 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.knox.gateway.filter; |
| |
| import org.apache.knox.gateway.GatewayMessages; |
| import org.apache.knox.gateway.config.GatewayConfig; |
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; |
| import org.eclipse.jetty.server.Request; |
| import org.eclipse.jetty.server.handler.HandlerWrapper; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * This is a helper handler that adjusts the "target" patch |
| * of the request when Topology Port Mapping feature is |
| * enabled. See KNOX-928. |
| * <p> |
| * This class also handles the Default Topology Feature |
| * where, any one of the topologies can be set to "default" |
| * and can listen on the standard Knox port (8443) and |
| * will not need /gateway/{topology} context. |
| * Basically Topology Port Mapping for standard port. |
| * Backwards compatible to Default Topology Feature. |
| */ |
| public class PortMappingHelperHandler extends HandlerWrapper { |
| private static final GatewayMessages LOG = MessagesFactory.get(GatewayMessages.class); |
| |
| private final GatewayConfig config; |
| private final String defaultTopologyRedirectContext; |
| |
| public PortMappingHelperHandler(final GatewayConfig config) { |
| this.config = config; |
| this.defaultTopologyRedirectContext = getDefaultTopologyRedirectContext(config); |
| } |
| |
| /** |
| * Set up context for default topology feature. |
| * @param config GatewayConfig object to read from |
| * @return default topology redirect context as a string |
| */ |
| private String getDefaultTopologyRedirectContext(final GatewayConfig config) { |
| final String defaultTopologyName = config.getDefaultTopologyName(); |
| |
| // default topology feature can also be enabled using port mapping feature |
| // config e.g. gateway.port.mapping.{defaultTopologyName} |
| String defaultTopologyRedirectContext = null; |
| if(defaultTopologyName == null && |
| config.getGatewayPortMappings().containsValue(config.getGatewayPort())) { |
| for(final Map.Entry<String, Integer> entry: config.getGatewayPortMappings().entrySet()) { |
| if(entry.getValue().equals(config.getGatewayPort())) { |
| defaultTopologyRedirectContext = "/" + config.getGatewayPath() + "/" + entry.getKey(); |
| break; |
| } |
| } |
| } |
| |
| if (defaultTopologyName != null) { |
| defaultTopologyRedirectContext = config.getDefaultAppRedirectPath(); |
| if (defaultTopologyRedirectContext != null |
| && defaultTopologyRedirectContext.trim().isEmpty()) { |
| defaultTopologyRedirectContext = null; |
| } |
| } |
| if (defaultTopologyRedirectContext != null) { |
| LOG.defaultTopologySetup(defaultTopologyName, defaultTopologyRedirectContext); |
| } |
| return defaultTopologyRedirectContext; |
| } |
| |
| @Override |
| public void handle(final String target, final Request baseRequest, |
| final HttpServletRequest request, final HttpServletResponse response) |
| throws IOException, ServletException { |
| final String baseURI = baseRequest.getRequestURI(); |
| final int port = baseRequest.getLocalPort(); |
| |
| if (config.isGatewayPortMappingEnabled() |
| && config.getGatewayPortMappings().containsValue(port)) { |
| // If Port Mapping feature enabled |
| handlePortMapping(target, baseRequest, request, response, port); |
| } else if (defaultTopologyRedirectContext != null && |
| !baseURI.startsWith("/" + config.getGatewayPath())) { |
| //Backwards compatibility for default topology feature |
| handleDefaultTopologyMapping(target, baseRequest, request, response); |
| } else { |
| // case where topology port mapping is not enabled (or improperly configured) |
| // and no default topology is configured |
| super.handle(target, baseRequest, request, response); |
| } |
| } |
| |
| private void handlePortMapping(final String target, final Request baseRequest, |
| final HttpServletRequest request, |
| final HttpServletResponse response, final int port) |
| throws IOException, ServletException { |
| final String topologyName = config.getGatewayPortMappings().entrySet() |
| .stream() |
| .filter(e -> e.getValue().equals(port)) |
| .map(Map.Entry::getKey) |
| .findFirst() |
| .orElse(null); |
| final String gatewayTopologyContext = "/" + config.getGatewayPath() + "/" + topologyName; |
| String newTarget = target; |
| |
| if(!target.contains(gatewayTopologyContext)) { |
| newTarget = gatewayTopologyContext + target; |
| } |
| |
| // if the request does not contain /{gatewayName}/{topologyName} |
| if(!baseRequest.getRequestURI().contains(gatewayTopologyContext)) { |
| RequestUpdateHandler.ForwardedRequest newRequest = new RequestUpdateHandler.ForwardedRequest( |
| request, gatewayTopologyContext); |
| |
| baseRequest.setPathInfo(gatewayTopologyContext + baseRequest.getPathInfo()); |
| baseRequest.setURIPathQuery(gatewayTopologyContext + baseRequest.getRequestURI()); |
| |
| LOG.topologyPortMappingUpdateRequest(target, newTarget); |
| super.handle(newTarget, baseRequest, newRequest, response); |
| } else { |
| super.handle(newTarget, baseRequest, request, response); |
| } |
| } |
| |
| private void handleDefaultTopologyMapping(final String target, final Request baseRequest, |
| final HttpServletRequest request, |
| final HttpServletResponse response) |
| throws IOException, ServletException { |
| RequestUpdateHandler.ForwardedRequest newRequest = new RequestUpdateHandler.ForwardedRequest( |
| request, defaultTopologyRedirectContext); |
| |
| final String newTarget = defaultTopologyRedirectContext + target; |
| LOG.defaultTopologyForward(target, newTarget); |
| super.handle(newTarget, baseRequest, newRequest, response); |
| } |
| } |