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org.springframework.http.server.reactive.TomcatHttpHandlerAdapter Maven / Gradle / Ivy
/*
* Copyright 2002-2020 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
*
* https://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.lang.reflect.Field;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import javax.servlet.AsyncContext;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.apache.catalina.connector.CoyoteInputStream;
import org.apache.catalina.connector.CoyoteOutputStream;
import org.apache.catalina.connector.RequestFacade;
import org.apache.catalina.connector.ResponseFacade;
import org.apache.coyote.Request;
import org.apache.coyote.Response;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
/**
* {@link ServletHttpHandlerAdapter} extension that uses Tomcat APIs for reading
* from the request and writing to the response with {@link ByteBuffer}.
*
* @author Violeta Georgieva
* @author Brian Clozel
* @since 5.0
* @see org.springframework.web.server.adapter.AbstractReactiveWebInitializer
*/
public class TomcatHttpHandlerAdapter extends ServletHttpHandlerAdapter {
public TomcatHttpHandlerAdapter(HttpHandler httpHandler) {
super(httpHandler);
}
@Override
protected ServletServerHttpRequest createRequest(HttpServletRequest request, AsyncContext asyncContext)
throws IOException, URISyntaxException {
Assert.notNull(getServletPath(), "Servlet path is not initialized");
return new TomcatServerHttpRequest(
request, asyncContext, getServletPath(), getDataBufferFactory(), getBufferSize());
}
@Override
protected ServletServerHttpResponse createResponse(HttpServletResponse response,
AsyncContext asyncContext, ServletServerHttpRequest request) throws IOException {
return new TomcatServerHttpResponse(
response, asyncContext, getDataBufferFactory(), getBufferSize(), request);
}
private static final class TomcatServerHttpRequest extends ServletServerHttpRequest {
private static final Field COYOTE_REQUEST_FIELD;
private final int bufferSize;
private final DataBufferFactory factory;
static {
Field field = ReflectionUtils.findField(RequestFacade.class, "request");
Assert.state(field != null, "Incompatible Tomcat implementation");
ReflectionUtils.makeAccessible(field);
COYOTE_REQUEST_FIELD = field;
}
TomcatServerHttpRequest(HttpServletRequest request, AsyncContext context,
String servletPath, DataBufferFactory factory, int bufferSize)
throws IOException, URISyntaxException {
super(createTomcatHttpHeaders(request), request, context, servletPath, factory, bufferSize);
this.factory = factory;
this.bufferSize = bufferSize;
}
private static HttpHeaders createTomcatHttpHeaders(HttpServletRequest request) {
RequestFacade requestFacade = getRequestFacade(request);
org.apache.catalina.connector.Request connectorRequest = (org.apache.catalina.connector.Request)
ReflectionUtils.getField(COYOTE_REQUEST_FIELD, requestFacade);
Assert.state(connectorRequest != null, "No Tomcat connector request");
Request tomcatRequest = connectorRequest.getCoyoteRequest();
TomcatHeadersAdapter headers = new TomcatHeadersAdapter(tomcatRequest.getMimeHeaders());
return new HttpHeaders(headers);
}
private static RequestFacade getRequestFacade(HttpServletRequest request) {
if (request instanceof RequestFacade) {
return (RequestFacade) request;
}
else if (request instanceof HttpServletRequestWrapper) {
HttpServletRequestWrapper wrapper = (HttpServletRequestWrapper) request;
HttpServletRequest wrappedRequest = (HttpServletRequest) wrapper.getRequest();
return getRequestFacade(wrappedRequest);
}
else {
throw new IllegalArgumentException("Cannot convert [" + request.getClass() +
"] to org.apache.catalina.connector.RequestFacade");
}
}
@Override
protected DataBuffer readFromInputStream() throws IOException {
ServletInputStream inputStream = ((ServletRequest) getNativeRequest()).getInputStream();
if (!(inputStream instanceof CoyoteInputStream)) {
// It's possible InputStream can be wrapped, preventing use of CoyoteInputStream
return super.readFromInputStream();
}
boolean release = true;
int capacity = this.bufferSize;
DataBuffer dataBuffer = this.factory.allocateBuffer(capacity);
try {
ByteBuffer byteBuffer = dataBuffer.asByteBuffer(0, capacity);
int read = ((CoyoteInputStream) inputStream).read(byteBuffer);
logBytesRead(read);
if (read > 0) {
dataBuffer.writePosition(read);
release = false;
return dataBuffer;
}
else if (read == -1) {
return EOF_BUFFER;
}
else {
return null;
}
}
finally {
if (release) {
DataBufferUtils.release(dataBuffer);
}
}
}
}
private static final class TomcatServerHttpResponse extends ServletServerHttpResponse {
private static final Field COYOTE_RESPONSE_FIELD;
static {
Field field = ReflectionUtils.findField(ResponseFacade.class, "response");
Assert.state(field != null, "Incompatible Tomcat implementation");
ReflectionUtils.makeAccessible(field);
COYOTE_RESPONSE_FIELD = field;
}
TomcatServerHttpResponse(HttpServletResponse response, AsyncContext context,
DataBufferFactory factory, int bufferSize, ServletServerHttpRequest request) throws IOException {
super(createTomcatHttpHeaders(response), response, context, factory, bufferSize, request);
}
private static HttpHeaders createTomcatHttpHeaders(HttpServletResponse response) {
ResponseFacade responseFacade = getResponseFacade(response);
org.apache.catalina.connector.Response connectorResponse = (org.apache.catalina.connector.Response)
ReflectionUtils.getField(COYOTE_RESPONSE_FIELD, responseFacade);
Assert.state(connectorResponse != null, "No Tomcat connector response");
Response tomcatResponse = connectorResponse.getCoyoteResponse();
TomcatHeadersAdapter headers = new TomcatHeadersAdapter(tomcatResponse.getMimeHeaders());
return new HttpHeaders(headers);
}
private static ResponseFacade getResponseFacade(HttpServletResponse response) {
if (response instanceof ResponseFacade) {
return (ResponseFacade) response;
}
else if (response instanceof HttpServletResponseWrapper) {
HttpServletResponseWrapper wrapper = (HttpServletResponseWrapper) response;
HttpServletResponse wrappedResponse = (HttpServletResponse) wrapper.getResponse();
return getResponseFacade(wrappedResponse);
}
else {
throw new IllegalArgumentException("Cannot convert [" + response.getClass() +
"] to org.apache.catalina.connector.ResponseFacade");
}
}
@Override
protected void applyHeaders() {
HttpServletResponse response = getNativeResponse();
MediaType contentType = null;
try {
contentType = getHeaders().getContentType();
}
catch (Exception ex) {
String rawContentType = getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
response.setContentType(rawContentType);
}
if (response.getContentType() == null && contentType != null) {
response.setContentType(contentType.toString());
}
getHeaders().remove(HttpHeaders.CONTENT_TYPE);
Charset charset = (contentType != null ? contentType.getCharset() : null);
if (response.getCharacterEncoding() == null && charset != null) {
response.setCharacterEncoding(charset.name());
}
long contentLength = getHeaders().getContentLength();
if (contentLength != -1) {
response.setContentLengthLong(contentLength);
}
getHeaders().remove(HttpHeaders.CONTENT_LENGTH);
}
@Override
protected int writeToOutputStream(DataBuffer dataBuffer) throws IOException {
ByteBuffer input = dataBuffer.asByteBuffer();
int len = input.remaining();
ServletResponse response = getNativeResponse();
((CoyoteOutputStream) response.getOutputStream()).write(input);
return len;
}
}
}
