/*
* Copyright 2002-2011 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;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.util.Assert;
/**
* {@link ServerHttpRequest} implementation that is based on a {@link HttpServletRequest}.
*
* @author Arjen Poutsma
* @since 3.0
*/
public class ServletServerHttpRequest implements ServerHttpRequest {
protected static final String FORM_CONTENT_TYPE = "application/x-www-form-urlencoded";
protected static final String FORM_CHARSET = "UTF-8";
private static final String METHOD_POST = "POST";
private final HttpServletRequest servletRequest;
private HttpHeaders headers;
/**
* Construct a new instance of the ServletServerHttpRequest based on the given {@link HttpServletRequest}.
* @param servletRequest the servlet request
*/
public ServletServerHttpRequest(HttpServletRequest servletRequest) {
Assert.notNull(servletRequest, "'servletRequest' must not be null");
this.servletRequest = servletRequest;
}
/**
* Returns the {@code HttpServletRequest} this object is based on.
*/
public HttpServletRequest getServletRequest() {
return this.servletRequest;
}
public HttpMethod getMethod() {
return HttpMethod.valueOf(this.servletRequest.getMethod());
}
public URI getURI() {
try {
return new URI(this.servletRequest.getScheme(), null, this.servletRequest.getServerName(),
this.servletRequest.getServerPort(), this.servletRequest.getRequestURI(),
this.servletRequest.getQueryString(), null);
}
catch (URISyntaxException ex) {
throw new IllegalStateException("Could not get HttpServletRequest URI: " + ex.getMessage(), ex);
}
}
public HttpHeaders getHeaders() {
if (this.headers == null) {
this.headers = new HttpHeaders();
for (Enumeration headerNames = this.servletRequest.getHeaderNames(); headerNames.hasMoreElements();) {
String headerName = (String) headerNames.nextElement();
for (Enumeration headerValues = this.servletRequest.getHeaders(headerName);
headerValues.hasMoreElements();) {
String headerValue = (String) headerValues.nextElement();
this.headers.add(headerName, headerValue);
}
}
}
return this.headers;
}
public InputStream getBody() throws IOException {
if (isFormPost(this.servletRequest)) {
return getBodyFromServletRequestParameters(this.servletRequest);
}
else {
return this.servletRequest.getInputStream();
}
}
private boolean isFormPost(HttpServletRequest request) {
return (request.getContentType() != null && request.getContentType().contains(FORM_CONTENT_TYPE) &&
METHOD_POST.equalsIgnoreCase(request.getMethod()));
}
/**
* Use {@link javax.servlet.ServletRequest#getParameterMap()} to reconstruct the
* body of a form 'POST' providing a predictable outcome as opposed to reading
* from the body, which can fail if any other code has used ServletRequest
* to access a parameter thus causing the input stream to be "consumed".
*/
private InputStream getBodyFromServletRequestParameters(HttpServletRequest request) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(bos, FORM_CHARSET);
Map<String, String[]> form = request.getParameterMap();
for (Iterator<String> nameIterator = form.keySet().iterator(); nameIterator.hasNext();) {
String name = nameIterator.next();
List<String> values = Arrays.asList(form.get(name));
for (Iterator<String> valueIterator = values.iterator(); valueIterator.hasNext();) {
String value = valueIterator.next();
writer.write(URLEncoder.encode(name, FORM_CHARSET));
if (value != null) {
writer.write('=');
writer.write(URLEncoder.encode(value, FORM_CHARSET));
if (valueIterator.hasNext()) {
writer.write('&');
}
}
}
if (nameIterator.hasNext()) {
writer.append('&');
}
}
writer.flush();
return new ByteArrayInputStream(bos.toByteArray());
}
}