Java tutorial
/* * Copyright 2002-2017 the original author or authors. * * Licensed 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.springframework.http.server.reactive; import java.io.IOException; import java.net.InetSocketAddress; import java.net.URI; import java.net.URISyntaxException; import java.nio.charset.Charset; import java.security.cert.X509Certificate; import java.util.Enumeration; import java.util.Map; import javax.servlet.AsyncContext; import javax.servlet.AsyncEvent; import javax.servlet.AsyncListener; import javax.servlet.ReadListener; import javax.servlet.ServletInputStream; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import reactor.core.publisher.Flux; import org.springframework.core.io.buffer.DataBuffer; import org.springframework.core.io.buffer.DataBufferFactory; import org.springframework.http.HttpCookie; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.lang.Nullable; import org.springframework.util.Assert; import org.springframework.util.LinkedCaseInsensitiveMap; import org.springframework.util.LinkedMultiValueMap; import org.springframework.util.MultiValueMap; import org.springframework.util.StringUtils; /** * Adapt {@link ServerHttpRequest} to the Servlet {@link HttpServletRequest}. * * @author Rossen Stoyanchev * @since 5.0 */ class ServletServerHttpRequest extends AbstractServerHttpRequest { protected final Log logger = LogFactory.getLog(getClass()); private final HttpServletRequest request; private final RequestBodyPublisher bodyPublisher; private final Object cookieLock = new Object(); private final DataBufferFactory bufferFactory; private final byte[] buffer; public ServletServerHttpRequest(HttpServletRequest request, AsyncContext asyncContext, String servletPath, DataBufferFactory bufferFactory, int bufferSize) throws IOException { super(initUri(request), request.getContextPath() + servletPath, initHeaders(request)); Assert.notNull(bufferFactory, "'bufferFactory' must not be null"); Assert.isTrue(bufferSize > 0, "'bufferSize' must be higher than 0"); this.request = request; this.bufferFactory = bufferFactory; this.buffer = new byte[bufferSize]; asyncContext.addListener(new RequestAsyncListener()); // Tomcat expects ReadListener registration on initial thread ServletInputStream inputStream = request.getInputStream(); this.bodyPublisher = new RequestBodyPublisher(inputStream); this.bodyPublisher.registerReadListener(); } private static URI initUri(HttpServletRequest request) { Assert.notNull(request, "'request' must not be null"); try { StringBuffer url = request.getRequestURL(); String query = request.getQueryString(); if (StringUtils.hasText(query)) { url.append('?').append(query); } return new URI(url.toString()); } catch (URISyntaxException ex) { throw new IllegalStateException("Could not get URI: " + ex.getMessage(), ex); } } private static HttpHeaders initHeaders(HttpServletRequest request) { HttpHeaders headers = new HttpHeaders(); for (Enumeration<?> names = request.getHeaderNames(); names.hasMoreElements();) { String name = (String) names.nextElement(); for (Enumeration<?> values = request.getHeaders(name); values.hasMoreElements();) { headers.add(name, (String) values.nextElement()); } } MediaType contentType = headers.getContentType(); if (contentType == null) { String requestContentType = request.getContentType(); if (StringUtils.hasLength(requestContentType)) { contentType = MediaType.parseMediaType(requestContentType); headers.setContentType(contentType); } } if (contentType != null && contentType.getCharset() == null) { String encoding = request.getCharacterEncoding(); if (StringUtils.hasLength(encoding)) { Charset charset = Charset.forName(encoding); Map<String, String> params = new LinkedCaseInsensitiveMap<>(); params.putAll(contentType.getParameters()); params.put("charset", charset.toString()); headers.setContentType(new MediaType(contentType.getType(), contentType.getSubtype(), params)); } } if (headers.getContentLength() == -1) { int contentLength = request.getContentLength(); if (contentLength != -1) { headers.setContentLength(contentLength); } } return headers; } @Override public String getMethodValue() { return this.request.getMethod(); } @Override protected MultiValueMap<String, HttpCookie> initCookies() { MultiValueMap<String, HttpCookie> httpCookies = new LinkedMultiValueMap<>(); Cookie[] cookies; synchronized (this.cookieLock) { cookies = this.request.getCookies(); } if (cookies != null) { for (Cookie cookie : cookies) { String name = cookie.getName(); HttpCookie httpCookie = new HttpCookie(name, cookie.getValue()); httpCookies.add(name, httpCookie); } } return httpCookies; } @Override public InetSocketAddress getRemoteAddress() { return new InetSocketAddress(this.request.getRemoteHost(), this.request.getRemotePort()); } @Nullable protected SslInfo initSslInfo() { if (!this.request.isSecure()) { return null; } return new DefaultSslInfo((String) request.getAttribute("javax.servlet.request.ssl_session_id"), (X509Certificate[]) request.getAttribute("java.security.cert.X509Certificate")); } @Override public Flux<DataBuffer> getBody() { return Flux.from(this.bodyPublisher); } /** * Read from the request body InputStream and return a DataBuffer. * Invoked only when {@link ServletInputStream#isReady()} returns "true". */ @Nullable protected DataBuffer readFromInputStream() throws IOException { int read = this.request.getInputStream().read(this.buffer); if (logger.isTraceEnabled()) { logger.trace("InputStream read returned " + read + (read != -1 ? " bytes" : "")); } if (read > 0) { DataBuffer dataBuffer = this.bufferFactory.allocateBuffer(read); dataBuffer.write(this.buffer, 0, read); return dataBuffer; } return null; } @SuppressWarnings("unchecked") @Override public <T> T getNativeRequest() { return (T) this.request; } private final class RequestAsyncListener implements AsyncListener { @Override public void onStartAsync(AsyncEvent event) { } @Override public void onTimeout(AsyncEvent event) { Throwable ex = event.getThrowable(); ex = ex != null ? ex : new IllegalStateException("Async operation timeout."); bodyPublisher.onError(ex); } @Override public void onError(AsyncEvent event) { bodyPublisher.onError(event.getThrowable()); } @Override public void onComplete(AsyncEvent event) { bodyPublisher.onAllDataRead(); } } private class RequestBodyPublisher extends AbstractListenerReadPublisher<DataBuffer> { private final ServletInputStream inputStream; public RequestBodyPublisher(ServletInputStream inputStream) { this.inputStream = inputStream; } public void registerReadListener() throws IOException { this.inputStream.setReadListener(new RequestBodyPublisherReadListener()); } @Override protected void checkOnDataAvailable() { if (!this.inputStream.isFinished() && this.inputStream.isReady()) { onDataAvailable(); } } @Override @Nullable protected DataBuffer read() throws IOException { if (this.inputStream.isReady()) { return readFromInputStream(); } return null; } @Override protected void readingPaused() { // no-op } private class RequestBodyPublisherReadListener implements ReadListener { @Override public void onDataAvailable() throws IOException { RequestBodyPublisher.this.onDataAvailable(); } @Override public void onAllDataRead() throws IOException { RequestBodyPublisher.this.onAllDataRead(); } @Override public void onError(Throwable throwable) { RequestBodyPublisher.this.onError(throwable); } } } }