private Response.ResponseBuilder evaluateIfNoneMatch(
EntityTag eTag, Set<? extends EntityTag> matchingTags, boolean isGetOrHead) {
if (isGetOrHead) {
if (matchingTags == MatchingEntityTag.ANY_MATCH) {
// 304 Not modified
return Response.notModified(eTag);
}
// The weak comparison function may be used to compare entity tags
if (matchingTags.contains(eTag)
|| matchingTags.contains(new EntityTag(eTag.getValue(), !eTag.isWeak()))) {
// 304 Not modified
return Response.notModified(eTag);
}
} else {
// The strong comparison function must be used to compare the entity
// tags. Thus if the entity tag of the entity is weak then matching
// of entity tags in the If-None-Match header should fail if the
// HTTP method is not GET or not HEAD.
if (eTag.isWeak()) {
return null;
}
if (matchingTags == MatchingEntityTag.ANY_MATCH || matchingTags.contains(eTag)) {
// 412 Precondition Failed
return Response.status(Response.Status.PRECONDITION_FAILED);
}
}
return null;
}
/**
* Add ETag and Last-Modified cache control headers to the response
*
* @param servletResponse the servlet response
* @param resource the fedora resource
* @param session the session
*/
protected static void addCacheControlHeaders(
final HttpServletResponse servletResponse,
final FedoraResource resource,
final Session session) {
final String txId = TransactionServiceImpl.getCurrentTransactionId(session);
if (txId != null) {
// Do not add caching headers if in a transaction
return;
}
final FedoraResource mutableResource =
resource instanceof NonRdfSourceDescription
? ((NonRdfSourceDescription) resource).getDescribedResource()
: resource;
final EntityTag etag = new EntityTag(mutableResource.getEtagValue());
final Date date = mutableResource.getLastModifiedDate();
if (!etag.getValue().isEmpty()) {
servletResponse.addHeader("ETag", etag.toString());
}
if (date != null) {
servletResponse.addDateHeader("Last-Modified", date.getTime());
}
}
@Override
public EntityTag getEntityTag() {
Object d = metadata.getFirst(HttpHeaders.ETAG);
if (d == null) return null;
if (d instanceof EntityTag) return (EntityTag) d;
return EntityTag.valueOf(getHeaderValueProcessor().toHeaderString(d));
}
// Private methods
private Response.ResponseBuilder evaluateIfMatch(EntityTag eTag) {
Set<? extends EntityTag> matchingTags = getIfMatch();
if (matchingTags == null) {
return null;
}
// The strong comparison function must be used to compare the entity
// tags. Thus if the entity tag of the entity is weak then matching
// of entity tags in the If-Match header should fail.
if (eTag.isWeak()) {
return Response.status(Response.Status.PRECONDITION_FAILED);
}
if (matchingTags != MatchingEntityTag.ANY_MATCH && !matchingTags.contains(eTag)) {
// 412 Precondition Failed
return Response.status(Response.Status.PRECONDITION_FAILED);
}
return null;
}
/** {@inheritDoc} */
public Client match(EntityTag tag, boolean ifNot) {
String hName = ifNot ? HttpHeaders.IF_NONE_MATCH : HttpHeaders.IF_MATCH;
state.getRequestHeaders().putSingle(hName, tag.toString());
return this;
}
