/**
* Determine the JSON encoding to use for the given content type.
*
* @param contentType the media type as requested by the caller
* @return the JSON encoding to use (never {@code null})
*/
protected JsonEncoding getJsonEncoding(MediaType contentType) {
if (contentType != null && contentType.getCharset() != null) {
Charset charset = contentType.getCharset();
for (JsonEncoding encoding : JsonEncoding.values()) {
if (charset.name().equals(encoding.getJavaName())) {
return encoding;
}
}
}
return JsonEncoding.UTF8;
}
@Override
protected void applyHeaders() {
for (Map.Entry<String, List<String>> entry : getHeaders().entrySet()) {
String headerName = entry.getKey();
for (String headerValue : entry.getValue()) {
this.response.addHeader(headerName, headerValue);
}
}
MediaType contentType = getHeaders().getContentType();
if (this.response.getContentType() == null && contentType != null) {
this.response.setContentType(contentType.toString());
}
Charset charset = (contentType != null ? contentType.getCharset() : null);
if (this.response.getCharacterEncoding() == null && charset != null) {
this.response.setCharacterEncoding(charset.name());
}
}
@Override
protected HttpHeaders initHeaders() {
HttpHeaders headers = new HttpHeaders();
for (Enumeration<?> names = getServletRequest().getHeaderNames(); names.hasMoreElements(); ) {
String name = (String) names.nextElement();
for (Enumeration<?> values = getServletRequest().getHeaders(name);
values.hasMoreElements(); ) {
headers.add(name, (String) values.nextElement());
}
}
MediaType contentType = headers.getContentType();
if (contentType == null) {
String requestContentType = getServletRequest().getContentType();
if (StringUtils.hasLength(requestContentType)) {
contentType = MediaType.parseMediaType(requestContentType);
headers.setContentType(contentType);
}
}
if (contentType != null && contentType.getCharset() == null) {
String encoding = getServletRequest().getCharacterEncoding();
if (StringUtils.hasLength(encoding)) {
Charset charset = Charset.forName(encoding);
Map<String, String> params = new LinkedCaseInsensitiveMap<>();
params.putAll(contentType.getParameters());
params.put("charset", charset.toString());
headers.setContentType(
new MediaType(contentType.getType(), contentType.getSubtype(), params));
}
}
if (headers.getContentLength() == -1) {
int contentLength = getServletRequest().getContentLength();
if (contentLength != -1) {
headers.setContentLength(contentLength);
}
}
return headers;
}
private Optional<Charset> getCharset(MediaType mediaType) {
return (mediaType != null ? Optional.ofNullable(mediaType.getCharset()) : Optional.empty());
}
private Charset getCharset(ClientHttpResponse response) {
HttpHeaders headers = response.getHeaders();
MediaType contentType = headers.getContentType();
return contentType != null ? contentType.getCharset() : null;
}