| /* |
| * 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.dispatch; |
| |
| import org.apache.http.client.HttpClient; |
| import org.apache.http.impl.client.CloseableHttpClient; |
| import org.apache.knox.gateway.SpiGatewayMessages; |
| import org.apache.knox.gateway.config.ConfigurationInjectorBuilder; |
| import org.apache.knox.gateway.filter.AbstractGatewayFilter; |
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; |
| import org.apache.knox.gateway.util.RegExUtils; |
| import org.apache.knox.gateway.util.WhitelistUtils; |
| |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| import java.io.UnsupportedEncodingException; |
| import java.net.URISyntaxException; |
| import java.net.URLDecoder; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| public class GatewayDispatchFilter extends AbstractGatewayFilter { |
| |
| private static final Map<String, Adapter> METHOD_ADAPTERS = createMethodAdapters(); |
| |
| protected static final SpiGatewayMessages LOG = MessagesFactory.get(SpiGatewayMessages.class); |
| |
| private final Object lock = new Object(); |
| |
| private String whitelist; |
| |
| private Dispatch dispatch; |
| |
| private HttpClient httpClient; |
| |
| private static Map<String, Adapter> createMethodAdapters() { |
| Map<String, Adapter> map = new HashMap<>(); |
| map.put("GET", new GetAdapter()); |
| map.put("POST", new PostAdapter()); |
| map.put("PUT", new PutAdapter()); |
| map.put("PATCH", new PatchAdapter()); |
| map.put("DELETE", new DeleteAdapter()); |
| map.put("OPTIONS", new OptionsAdapter()); |
| map.put("HEAD", new HeadAdapter()); |
| return Collections.unmodifiableMap(map); |
| } |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| super.init(filterConfig); |
| synchronized(lock) { |
| if (dispatch == null) { |
| String dispatchImpl = filterConfig.getInitParameter("dispatch-impl"); |
| dispatch = newInstanceFromName(dispatchImpl); |
| } |
| ConfigurationInjectorBuilder.configuration().target(dispatch).source(filterConfig).inject(); |
| HttpClientFactory httpClientFactory; |
| String httpClientFactoryClass = filterConfig.getInitParameter("httpClientFactory"); |
| if (httpClientFactoryClass != null) { |
| httpClientFactory = newInstanceFromName(httpClientFactoryClass); |
| } else { |
| httpClientFactory = new DefaultHttpClientFactory(); |
| } |
| httpClient = httpClientFactory.createHttpClient(filterConfig); |
| dispatch.setHttpClient(httpClient); |
| dispatch.init(); |
| } |
| } |
| |
| @Override |
| public void destroy() { |
| synchronized(lock) { |
| dispatch.destroy(); |
| try { |
| if (httpClient instanceof CloseableHttpClient) { |
| ((CloseableHttpClient) httpClient).close(); |
| } |
| } catch ( IOException e ) { |
| LOG.errorClosingHttpClient(e); |
| } |
| } |
| } |
| |
| public Dispatch getDispatch() { |
| synchronized(lock) { |
| return dispatch; |
| } |
| } |
| |
| public void setDispatch(Dispatch dispatch) { |
| synchronized(lock) { |
| this.dispatch = dispatch; |
| } |
| } |
| |
| @Override |
| protected void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException { |
| String method = request.getMethod().toUpperCase(Locale.ROOT); |
| Adapter adapter = METHOD_ADAPTERS.get(method); |
| if (adapter != null) { |
| if (isDispatchAllowed(request)) { |
| try { |
| adapter.doMethod(getDispatch(), request, response); |
| } catch (URISyntaxException e) { |
| throw new ServletException(e); |
| } |
| } else { |
| response.sendError(HttpServletResponse.SC_BAD_REQUEST); |
| } |
| } else { |
| response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| } |
| } |
| |
| private boolean isDispatchAllowed(HttpServletRequest request) { |
| boolean isAllowed = true; |
| |
| // Initialize the white list if it has not yet been initialized |
| if (whitelist == null) { |
| whitelist = WhitelistUtils.getDispatchWhitelist(request); |
| } |
| |
| if (whitelist != null) { |
| String requestURI = request.getRequestURI(); |
| |
| String decodedURL = null; |
| try { |
| decodedURL = URLDecoder.decode(requestURI, StandardCharsets.UTF_8.name()); |
| } catch (UnsupportedEncodingException e) { |
| // |
| } |
| |
| isAllowed = RegExUtils.checkWhitelist(whitelist, (decodedURL != null ? decodedURL : requestURI)); |
| |
| if (!isAllowed) { |
| LOG.dispatchDisallowed(requestURI); |
| } |
| } |
| |
| return isAllowed; |
| } |
| |
| private interface Adapter { |
| void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException; |
| } |
| |
| private static class GetAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doGet( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class PostAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doPost( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class PutAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doPut( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class PatchAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doPatch( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class DeleteAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doDelete( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class OptionsAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doOptions( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private static class HeadAdapter implements Adapter { |
| @Override |
| public void doMethod(Dispatch dispatch, HttpServletRequest request, HttpServletResponse response) |
| throws IOException, ServletException, URISyntaxException { |
| dispatch.doHead( dispatch.getDispatchUrl(request), request, response); |
| } |
| } |
| |
| private <T> T newInstanceFromName(String dispatchImpl) throws ServletException { |
| try { |
| Class<T> clazz = loadClass(dispatchImpl); |
| return clazz.newInstance(); |
| } catch ( Exception e ) { |
| throw new ServletException(e); |
| } |
| } |
| |
| private <T> Class<T> loadClass(String className) throws ClassNotFoundException { |
| ClassLoader loader = Thread.currentThread().getContextClassLoader(); |
| if ( loader == null ) { |
| loader = this.getClass().getClassLoader(); |
| } |
| return (Class<T>) loader.loadClass(className); |
| } |
| } |