org.springframework.http.converter.FormHttpMessageConverter Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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.converter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.mail.internet.MimeUtility;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.StreamingHttpOutputMessage;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MimeTypeUtils;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StreamUtils;
import org.springframework.util.StringUtils;
/**
* Implementation of {@link HttpMessageConverter} to read and write 'normal' HTML
* forms and also to write (but not read) multipart data (e.g. file uploads).
*
* In other words, this converter can read and write the
* {@code "application/x-www-form-urlencoded"} media type as
* {@link MultiValueMap MultiValueMap<String, String>} and it can also
* write (but not read) the {@code "multipart/form-data"} media type as
* {@link MultiValueMap MultiValueMap<String, Object>}.
*
*
When writing multipart data, this converter uses other
* {@link HttpMessageConverter HttpMessageConverters} to write the respective
* MIME parts. By default, basic converters are registered (for {@code Strings}
* and {@code Resources}). These can be overridden through the
* {@link #setPartConverters partConverters} property.
*
*
For example, the following snippet shows how to submit an HTML form:
*
* RestTemplate template = new RestTemplate();
* // AllEncompassingFormHttpMessageConverter is configured by default
*
* MultiValueMap<String, String> form = new LinkedMultiValueMap<>();
* form.add("field 1", "value 1");
* form.add("field 2", "value 2");
* form.add("field 2", "value 3");
* template.postForLocation("https://example.com/myForm", form);
*
*
* The following snippet shows how to do a file upload:
*
* MultiValueMap<String, Object> parts = new LinkedMultiValueMap<>();
* parts.add("field 1", "value 1");
* parts.add("file", new ClassPathResource("myFile.jpg"));
* template.postForLocation("https://example.com/myFileUpload", parts);
*
*
* Some methods in this class were inspired by
* {@code org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity}.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.0
* @see org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter
* @see org.springframework.util.MultiValueMap
*/
public class FormHttpMessageConverter implements HttpMessageConverter> {
public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");
private List supportedMediaTypes = new ArrayList();
private List> partConverters = new ArrayList>();
private Charset charset = DEFAULT_CHARSET;
private Charset multipartCharset;
public FormHttpMessageConverter() {
this.supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
this.supportedMediaTypes.add(MediaType.MULTIPART_FORM_DATA);
StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
stringHttpMessageConverter.setWriteAcceptCharset(false); // see SPR-7316
this.partConverters.add(new ByteArrayHttpMessageConverter());
this.partConverters.add(stringHttpMessageConverter);
this.partConverters.add(new ResourceHttpMessageConverter());
applyDefaultCharset();
}
/**
* Set the list of {@link MediaType} objects supported by this converter.
*/
public void setSupportedMediaTypes(List supportedMediaTypes) {
this.supportedMediaTypes = supportedMediaTypes;
}
@Override
public List getSupportedMediaTypes() {
return Collections.unmodifiableList(this.supportedMediaTypes);
}
/**
* Set the message body converters to use. These converters are used to
* convert objects to MIME parts.
*/
public void setPartConverters(List> partConverters) {
Assert.notEmpty(partConverters, "'partConverters' must not be empty");
this.partConverters = partConverters;
}
/**
* Add a message body converter. Such a converter is used to convert objects
* to MIME parts.
*/
public void addPartConverter(HttpMessageConverter partConverter) {
Assert.notNull(partConverter, "'partConverter' must not be null");
this.partConverters.add(partConverter);
}
/**
* Set the default character set to use for reading and writing form data when
* the request or response Content-Type header does not explicitly specify it.
* By default this is set to "UTF-8". As of 4.3, it will also be used as
* the default charset for the conversion of text bodies in a multipart request.
* In contrast to this, {@link #setMultipartCharset} only affects the encoding of
* file names in a multipart request according to the encoded-word syntax.
*/
public void setCharset(Charset charset) {
if (charset != this.charset) {
this.charset = (charset != null ? charset : DEFAULT_CHARSET);
applyDefaultCharset();
}
}
/**
* Apply the configured charset as a default to registered part converters.
*/
private void applyDefaultCharset() {
for (HttpMessageConverter candidate : this.partConverters) {
if (candidate instanceof AbstractHttpMessageConverter) {
AbstractHttpMessageConverter converter = (AbstractHttpMessageConverter) candidate;
// Only override default charset if the converter operates with a charset to begin with...
if (converter.getDefaultCharset() != null) {
converter.setDefaultCharset(this.charset);
}
}
}
}
/**
* Set the character set to use when writing multipart data to encode file
* names. Encoding is based on the encoded-word syntax defined in RFC 2047
* and relies on {@code MimeUtility} from "javax.mail".
*
If not set file names will be encoded as US-ASCII.
* @since 4.1.1
* @see Encoded-Word
*/
public void setMultipartCharset(Charset charset) {
this.multipartCharset = charset;
}
@Override
public boolean canRead(Class clazz, MediaType mediaType) {
if (!MultiValueMap.class.isAssignableFrom(clazz)) {
return false;
}
if (mediaType == null) {
return true;
}
for (MediaType supportedMediaType : getSupportedMediaTypes()) {
// We can't read multipart....
if (!supportedMediaType.equals(MediaType.MULTIPART_FORM_DATA) && supportedMediaType.includes(mediaType)) {
return true;
}
}
return false;
}
@Override
public boolean canWrite(Class clazz, MediaType mediaType) {
if (!MultiValueMap.class.isAssignableFrom(clazz)) {
return false;
}
if (mediaType == null || MediaType.ALL.equals(mediaType)) {
return true;
}
for (MediaType supportedMediaType : getSupportedMediaTypes()) {
if (supportedMediaType.isCompatibleWith(mediaType)) {
return true;
}
}
return false;
}
@Override
public MultiValueMap read(Class> clazz,
HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
MediaType contentType = inputMessage.getHeaders().getContentType();
Charset charset = (contentType.getCharset() != null ? contentType.getCharset() : this.charset);
String body = StreamUtils.copyToString(inputMessage.getBody(), charset);
String[] pairs = StringUtils.tokenizeToStringArray(body, "&");
MultiValueMap result = new LinkedMultiValueMap(pairs.length);
for (String pair : pairs) {
int idx = pair.indexOf('=');
if (idx == -1) {
result.add(URLDecoder.decode(pair, charset.name()), null);
}
else {
String name = URLDecoder.decode(pair.substring(0, idx), charset.name());
String value = URLDecoder.decode(pair.substring(idx + 1), charset.name());
result.add(name, value);
}
}
return result;
}
@Override
@SuppressWarnings("unchecked")
public void write(MultiValueMap map, MediaType contentType, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
if (!isMultipart(map, contentType)) {
writeForm((MultiValueMap) map, contentType, outputMessage);
}
else {
writeMultipart((MultiValueMap) map, outputMessage);
}
}
private boolean isMultipart(MultiValueMap map, MediaType contentType) {
if (contentType != null) {
return MediaType.MULTIPART_FORM_DATA.includes(contentType);
}
for (List values : map.values()) {
for (Object value : values) {
if (value != null && !(value instanceof String)) {
return true;
}
}
}
return false;
}
private void writeForm(MultiValueMap form, MediaType contentType,
HttpOutputMessage outputMessage) throws IOException {
Charset charset;
if (contentType != null) {
outputMessage.getHeaders().setContentType(contentType);
charset = (contentType.getCharset() != null ? contentType.getCharset() : this.charset);
}
else {
outputMessage.getHeaders().setContentType(MediaType.APPLICATION_FORM_URLENCODED);
charset = this.charset;
}
StringBuilder builder = new StringBuilder();
for (Iterator nameIterator = form.keySet().iterator(); nameIterator.hasNext();) {
String name = nameIterator.next();
for (Iterator valueIterator = form.get(name).iterator(); valueIterator.hasNext();) {
String value = valueIterator.next();
builder.append(URLEncoder.encode(name, charset.name()));
if (value != null) {
builder.append('=');
builder.append(URLEncoder.encode(value, charset.name()));
if (valueIterator.hasNext()) {
builder.append('&');
}
}
}
if (nameIterator.hasNext()) {
builder.append('&');
}
}
final byte[] bytes = builder.toString().getBytes(charset.name());
outputMessage.getHeaders().setContentLength(bytes.length);
if (outputMessage instanceof StreamingHttpOutputMessage) {
StreamingHttpOutputMessage streamingOutputMessage = (StreamingHttpOutputMessage) outputMessage;
streamingOutputMessage.setBody(new StreamingHttpOutputMessage.Body() {
@Override
public void writeTo(OutputStream outputStream) throws IOException {
StreamUtils.copy(bytes, outputStream);
}
});
}
else {
StreamUtils.copy(bytes, outputMessage.getBody());
}
}
private void writeMultipart(final MultiValueMap parts, HttpOutputMessage outputMessage)
throws IOException {
final byte[] boundary = generateMultipartBoundary();
Map parameters = Collections.singletonMap("boundary", new String(boundary, "US-ASCII"));
MediaType contentType = new MediaType(MediaType.MULTIPART_FORM_DATA, parameters);
HttpHeaders headers = outputMessage.getHeaders();
headers.setContentType(contentType);
if (outputMessage instanceof StreamingHttpOutputMessage) {
StreamingHttpOutputMessage streamingOutputMessage = (StreamingHttpOutputMessage) outputMessage;
streamingOutputMessage.setBody(new StreamingHttpOutputMessage.Body() {
@Override
public void writeTo(OutputStream outputStream) throws IOException {
writeParts(outputStream, parts, boundary);
writeEnd(outputStream, boundary);
}
});
}
else {
writeParts(outputMessage.getBody(), parts, boundary);
writeEnd(outputMessage.getBody(), boundary);
}
}
private void writeParts(OutputStream os, MultiValueMap parts, byte[] boundary) throws IOException {
for (Map.Entry> entry : parts.entrySet()) {
String name = entry.getKey();
for (Object part : entry.getValue()) {
if (part != null) {
writeBoundary(os, boundary);
writePart(name, getHttpEntity(part), os);
writeNewLine(os);
}
}
}
}
@SuppressWarnings("unchecked")
private void writePart(String name, HttpEntity partEntity, OutputStream os) throws IOException {
Object partBody = partEntity.getBody();
Class partType = partBody.getClass();
HttpHeaders partHeaders = partEntity.getHeaders();
MediaType partContentType = partHeaders.getContentType();
for (HttpMessageConverter messageConverter : this.partConverters) {
if (messageConverter.canWrite(partType, partContentType)) {
HttpOutputMessage multipartMessage = new MultipartHttpOutputMessage(os);
multipartMessage.getHeaders().setContentDispositionFormData(name, getFilename(partBody));
if (!partHeaders.isEmpty()) {
multipartMessage.getHeaders().putAll(partHeaders);
}
((HttpMessageConverter