INT-1256 initial commit of new (experimental) inbound HTTP adapter
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Mark Fisher
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/*
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* Copyright 2002-2010 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.integration.http;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.MediaType;
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import org.springframework.http.converter.ByteArrayHttpMessageConverter;
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import org.springframework.http.converter.HttpMessageConverter;
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import org.springframework.http.converter.ResourceHttpMessageConverter;
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import org.springframework.http.converter.StringHttpMessageConverter;
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//import org.springframework.http.converter.feed.AtomFeedHttpMessageConverter;
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//import org.springframework.http.converter.feed.RssChannelHttpMessageConverter;
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import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;
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import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
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import org.springframework.http.converter.xml.SourceHttpMessageConverter;
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import org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter;
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import org.springframework.http.server.ServletServerHttpRequest;
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import org.springframework.http.server.ServletServerHttpResponse;
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import org.springframework.integration.core.Message;
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import org.springframework.integration.core.MessageHeaders;
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import org.springframework.integration.core.MessagingException;
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import org.springframework.integration.gateway.AbstractMessagingGateway;
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import org.springframework.integration.message.HeaderMapper;
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import org.springframework.integration.message.MessageBuilder;
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import org.springframework.util.Assert;
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import org.springframework.util.ClassUtils;
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import org.springframework.web.HttpRequestHandler;
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/**
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* @author Mark Fisher
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* @since 2.0
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*/
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public class HttpRequestHandlingMessagingGateway extends AbstractMessagingGateway implements HttpRequestHandler {
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private static final boolean jaxb2Present =
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ClassUtils.isPresent("javax.xml.bind.Binder", HttpRequestHandlingMessagingGateway.class.getClassLoader());
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private static final boolean jacksonPresent =
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ClassUtils.isPresent("org.codehaus.jackson.map.ObjectMapper", HttpRequestHandlingMessagingGateway.class.getClassLoader()) &&
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ClassUtils.isPresent("org.codehaus.jackson.JsonGenerator", HttpRequestHandlingMessagingGateway.class.getClassLoader());
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private static boolean romePresent =
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ClassUtils.isPresent("com.sun.syndication.feed.WireFeed", HttpRequestHandlingMessagingGateway.class.getClassLoader());
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private volatile Class<?> expectedType = byte[].class;
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private final List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
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private volatile HeaderMapper<HttpHeaders> headerMapper = new DefaultHeaderMapper();
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private final boolean expectReply;
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public HttpRequestHandlingMessagingGateway() {
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this(true);
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}
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@SuppressWarnings("unchecked")
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public HttpRequestHandlingMessagingGateway(boolean expectReply) {
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this.expectReply = expectReply;
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this.messageConverters.add(new SerializingHttpMessageConverter());
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this.messageConverters.add(new ByteArrayHttpMessageConverter());
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this.messageConverters.add(new StringHttpMessageConverter());
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this.messageConverters.add(new ResourceHttpMessageConverter());
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this.messageConverters.add(new SourceHttpMessageConverter());
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this.messageConverters.add(new XmlAwareFormHttpMessageConverter());
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if (jaxb2Present) {
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this.messageConverters.add(new Jaxb2RootElementHttpMessageConverter());
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}
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if (jacksonPresent) {
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this.messageConverters.add(new MappingJacksonHttpMessageConverter());
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}
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if (romePresent) {
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// TODO add deps for:
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//this.messageConverters.add(new AtomFeedHttpMessageConverter());
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//this.messageConverters.add(new RssChannelHttpMessageConverter());
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}
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}
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public void setExpectedType(Class<?> expectedType) {
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Assert.notNull(expectedType, "expectedType must not be null");
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this.expectedType = expectedType;
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}
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public final void handleRequest(HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws ServletException, IOException {
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this.doHandleRequest(new ServletServerHttpRequest(servletRequest), new ServletServerHttpResponse(servletResponse));
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}
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private void doHandleRequest(ServletServerHttpRequest request, ServletServerHttpResponse response) throws IOException {
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Object payload = this.readPayload(request);
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Map<String, ?> headers = this.headerMapper.toHeaders(request.getHeaders());
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Message<?> message = MessageBuilder.withPayload(payload).copyHeaders(headers).build();
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if (this.expectReply) {
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Message<?> reply = this.sendAndReceiveMessage(message);
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this.headerMapper.fromHeaders(reply.getHeaders(), response.getHeaders());
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if (reply.getPayload() != null) {
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this.writePayload(reply.getPayload(), response, request.getHeaders().getAccept());
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}
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}
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else {
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this.send(message);
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// will be a status response for now... add an optional ResponseGenerator strategy?
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}
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}
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@SuppressWarnings("unchecked")
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private Object readPayload(ServletServerHttpRequest request) throws IOException {
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MediaType contentType = request.getHeaders().getContentType();
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for (HttpMessageConverter<?> converter : this.messageConverters) {
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if (converter.canRead(this.expectedType, contentType)) {
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return converter.read((Class) this.expectedType, request);
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}
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}
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throw new MessagingException("Could not convert request: no suitable HttpMessageConverter found for expected type [" +
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this.expectedType.getName() + "] and content type [" + contentType + "]");
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}
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@SuppressWarnings("unchecked")
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private void writePayload(Object payload, ServletServerHttpResponse response, List<MediaType> acceptTypes) throws IOException {
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for (HttpMessageConverter converter : this.messageConverters) {
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for (MediaType acceptType : acceptTypes) {
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if (converter.canWrite(payload.getClass(), acceptType)) {
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converter.write(payload, acceptType, response);
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return;
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}
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}
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}
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throw new MessagingException("Could not convert reply: no suitable HttpMessageConverter found for result type [" +
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payload.getClass().getName() + "] and content types [" + acceptTypes + "]");
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}
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private static class DefaultHeaderMapper implements HeaderMapper<HttpHeaders> {
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public void fromHeaders(MessageHeaders headers, HttpHeaders target) {
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for (String name : headers.keySet()) {
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Object value = headers.get(name);
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if (value instanceof String) {
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target.add(name, (String) value);
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}
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}
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}
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public Map<String, ?> toHeaders(HttpHeaders source) {
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return source;
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}
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}
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}
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