/*
* 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.web.filter;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* {@link javax.servlet.Filter} that makes form encoded data available through
* the {@code ServletRequest.getParameter*()} family of methods during HTTP PUT
* or PATCH requests.
*
* <p>The Servlet spec requires form data to be available for HTTP POST but
* not for HTTP PUT or PATCH requests. This filter intercepts HTTP PUT and PATCH
* requests where content type is {@code 'application/x-www-form-urlencoded'},
* reads form encoded content from the body of the request, and wraps the ServletRequest
* in order to make the form data available as request parameters just like
* it is for HTTP POST requests.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class HttpPutFormContentFilter extends OncePerRequestFilter {
private FormHttpMessageConverter formConverter = new AllEncompassingFormHttpMessageConverter();
/**
* Set the converter to use for parsing form content.
* <p>By default this is an instnace of {@link AllEncompassingFormHttpMessageConverter}.
*/
public void setFormConverter(FormHttpMessageConverter converter) {
Assert.notNull(converter, "FormHttpMessageConverter is required.");
this.formConverter = converter;
}
public FormHttpMessageConverter getFormConverter() {
return this.formConverter;
}
/**
* The default character set to use for reading form data.
* This is a shortcut for:<br>
* {@code getFormConverter.setCharset(charset)}.
*/
public void setCharset(Charset charset) {
this.formConverter.setCharset(charset);
}
@Override
protected void doFilterInternal(final HttpServletRequest request, HttpServletResponse response,
FilterChain filterChain) throws ServletException, IOException {
if (("PUT".equals(request.getMethod()) || "PATCH".equals(request.getMethod())) && isFormContentType(request)) {
HttpInputMessage inputMessage = new ServletServerHttpRequest(request) {
@Override
public InputStream getBody() throws IOException {
return request.getInputStream();
}
};
MultiValueMap<String, String> formParameters = formConverter.read(null, inputMessage);
HttpServletRequest wrapper = new HttpPutFormContentRequestWrapper(request, formParameters);
filterChain.doFilter(wrapper, response);
}
else {
filterChain.doFilter(request, response);
}
}
private boolean isFormContentType(HttpServletRequest request) {
String contentType = request.getContentType();
if (contentType != null) {
try {
MediaType mediaType = MediaType.parseMediaType(contentType);
return (MediaType.APPLICATION_FORM_URLENCODED.includes(mediaType));
}
catch (IllegalArgumentException ex) {
return false;
}
}
else {
return false;
}
}
private static class HttpPutFormContentRequestWrapper extends HttpServletRequestWrapper {
private MultiValueMap<String, String> formParameters;
public HttpPutFormContentRequestWrapper(HttpServletRequest request, MultiValueMap<String, String> parameters) {
super(request);
this.formParameters = (parameters != null ? parameters : new LinkedMultiValueMap<>());
}
@Override
public String getParameter(String name) {
String queryStringValue = super.getParameter(name);
String formValue = this.formParameters.getFirst(name);
return (queryStringValue != null ? queryStringValue : formValue);
}
@Override
public Map<String, String[]> getParameterMap() {
Map<String, String[]> result = new LinkedHashMap<>();
Enumeration<String> names = getParameterNames();
while (names.hasMoreElements()) {
String name = names.nextElement();
result.put(name, getParameterValues(name));
}
return result;
}
@Override
public Enumeration<String> getParameterNames() {
Set<String> names = new LinkedHashSet<>();
names.addAll(Collections.list(super.getParameterNames()));
names.addAll(this.formParameters.keySet());
return Collections.enumeration(names);
}
@Override
public String[] getParameterValues(String name) {
String[] queryStringValues = super.getParameterValues(name);
List<String> formValues = this.formParameters.get(name);
if (formValues == null) {
return queryStringValues;
}
else if (queryStringValues == null) {
return formValues.toArray(new String[formValues.size()]);
}
else {
List<String> result = new ArrayList<>(queryStringValues.length + formValues.size());
result.addAll(Arrays.asList(queryStringValues));
result.addAll(formValues);
return result.toArray(new String[result.size()]);
}
}
}
}