/*
* Copyright 2013-2015 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.cloud.netflix.feign.support;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.util.Collection;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import lombok.extern.apachecommons.CommonsLog;
import static org.springframework.cloud.netflix.feign.support.FeignUtils.getHeaders;
import static org.springframework.cloud.netflix.feign.support.FeignUtils.getHttpHeaders;
/**
* @author Spencer Gibb
*/
@CommonsLog
public class SpringEncoder implements Encoder {
private ObjectFactory<HttpMessageConverters> messageConverters;
public SpringEncoder(ObjectFactory<HttpMessageConverters> messageConverters) {
this.messageConverters = messageConverters;
}
@Override
public void encode(Object requestBody, Type bodyType, RequestTemplate request)
throws EncodeException {
// template.body(conversionService.convert(object, String.class));
if (requestBody != null) {
Class<?> requestType = requestBody.getClass();
Collection<String> contentTypes = request.headers().get("Content-Type");
MediaType requestContentType = null;
if (contentTypes != null && !contentTypes.isEmpty()) {
String type = contentTypes.iterator().next();
requestContentType = MediaType.valueOf(type);
}
for (HttpMessageConverter<?> messageConverter : this.messageConverters
.getObject().getConverters()) {
if (messageConverter.canWrite(requestType, requestContentType)) {
if (log.isDebugEnabled()) {
if (requestContentType != null) {
log.debug("Writing [" + requestBody + "] as \""
+ requestContentType + "\" using ["
+ messageConverter + "]");
}
else {
log.debug("Writing [" + requestBody + "] using ["
+ messageConverter + "]");
}
}
FeignOutputMessage outputMessage = new FeignOutputMessage(request);
try {
@SuppressWarnings("unchecked")
HttpMessageConverter<Object> copy = (HttpMessageConverter<Object>) messageConverter;
copy.write(requestBody, requestContentType, outputMessage);
}
catch (IOException ex) {
throw new EncodeException("Error converting request body", ex);
}
// clear headers
request.headers(null);
// converters can modify headers, so update the request
// with the modified headers
request.headers(getHeaders(outputMessage.getHeaders()));
// do not use charset for binary data
if (messageConverter instanceof ByteArrayHttpMessageConverter) {
request.body(outputMessage.getOutputStream().toByteArray(), null);
} else {
request.body(outputMessage.getOutputStream().toByteArray(), Charset.forName("UTF-8"));
}
return;
}
}
String message = "Could not write request: no suitable HttpMessageConverter "
+ "found for request type [" + requestType.getName() + "]";
if (requestContentType != null) {
message += " and content type [" + requestContentType + "]";
}
throw new EncodeException(message);
}
}
private class FeignOutputMessage implements HttpOutputMessage {
private final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
private final HttpHeaders httpHeaders;
private FeignOutputMessage(RequestTemplate request) {
httpHeaders = getHttpHeaders(request.headers());
}
@Override
public OutputStream getBody() throws IOException {
return this.outputStream;
}
@Override
public HttpHeaders getHeaders() {
return this.httpHeaders;
}
public ByteArrayOutputStream getOutputStream() {
return this.outputStream;
}
}
}