private Response.ResponseBuilder getNoCacheResponseBuilder(Response.Status status) {
CacheControl cc = new CacheControl();
cc.setNoCache(true);
cc.setMaxAge(-1);
cc.setMustRevalidate(true);
return Response.status(status).cacheControl(cc);
}
/**
* Get the binary content of a datastream
*
* @param rangeValue the range value
* @return Binary blob
* @throws IOException if io exception occurred
*/
protected Response getBinaryContent(final String rangeValue) throws IOException {
final FedoraBinary binary = (FedoraBinary) resource();
// we include an explicit etag, because the default behavior is to use the JCR node's etag, not
// the jcr:content node digest. The etag is only included if we are not within a transaction.
final String txId = TransactionServiceImpl.getCurrentTransactionId(session());
if (txId == null) {
checkCacheControlHeaders(request, servletResponse, binary, session());
}
final CacheControl cc = new CacheControl();
cc.setMaxAge(0);
cc.setMustRevalidate(true);
Response.ResponseBuilder builder;
if (rangeValue != null && rangeValue.startsWith("bytes")) {
final Range range = Range.convert(rangeValue);
final long contentSize = binary.getContentSize();
final String endAsString;
if (range.end() == -1) {
endAsString = Long.toString(contentSize - 1);
} else {
endAsString = Long.toString(range.end());
}
final String contentRangeValue =
String.format("bytes %s-%s/%s", range.start(), endAsString, contentSize);
if (range.end() > contentSize || (range.end() == -1 && range.start() > contentSize)) {
builder =
status(REQUESTED_RANGE_NOT_SATISFIABLE).header("Content-Range", contentRangeValue);
} else {
final RangeRequestInputStream rangeInputStream =
new RangeRequestInputStream(binary.getContent(), range.start(), range.size());
builder =
status(PARTIAL_CONTENT)
.entity(rangeInputStream)
.header("Content-Range", contentRangeValue);
}
} else {
final InputStream content = binary.getContent();
builder = ok(content);
}
// we set the content-type explicitly to avoid content-negotiation from getting in the way
return builder.type(binary.getMimeType()).cacheControl(cc).build();
}
private static void evaluateRequestPreconditions(
final Request request,
final HttpServletResponse servletResponse,
final FedoraResource resource,
final Session session,
final boolean cacheControl) {
final String txId = TransactionServiceImpl.getCurrentTransactionId(session);
if (txId != null) {
// Force cache revalidation if in a transaction
servletResponse.addHeader(CACHE_CONTROL, "must-revalidate");
servletResponse.addHeader(CACHE_CONTROL, "max-age=0");
return;
}
final EntityTag etag = new EntityTag(resource.getEtagValue());
final Date date = resource.getLastModifiedDate();
final Date roundedDate = new Date();
if (date != null) {
roundedDate.setTime(date.getTime() - date.getTime() % 1000);
}
Response.ResponseBuilder builder = request.evaluatePreconditions(etag);
if (builder != null) {
builder = builder.entity("ETag mismatch");
} else {
builder = request.evaluatePreconditions(roundedDate);
if (builder != null) {
builder = builder.entity("Date mismatch");
}
}
if (builder != null && cacheControl) {
final CacheControl cc = new CacheControl();
cc.setMaxAge(0);
cc.setMustRevalidate(true);
// here we are implicitly emitting a 304
// the exception is not an error, it's genuinely
// an exceptional condition
builder = builder.cacheControl(cc).lastModified(date).tag(etag);
}
if (builder != null) {
throw new WebApplicationException(builder.build());
}
}
/**
* Get the binary content of a datastream
*
* @param pathList
* @return Binary blob
* @throws RepositoryException
*/
@GET
public Response getContent(
@PathParam("path") List<PathSegment> pathList, @Context final Request request)
throws RepositoryException {
String path = toPath(pathList);
final Datastream ds = datastreamService.getDatastream(path);
final EntityTag etag = new EntityTag(ds.getContentDigest().toString());
final Date date = ds.getLastModifiedDate();
final Date roundedDate = new Date();
roundedDate.setTime(date.getTime() - date.getTime() % 1000);
ResponseBuilder builder = request.evaluatePreconditions(roundedDate, etag);
final CacheControl cc = new CacheControl();
cc.setMaxAge(0);
cc.setMustRevalidate(true);
if (builder == null) {
builder = Response.ok(ds.getContent(), ds.getMimeType());
}
return builder.cacheControl(cc).lastModified(date).tag(etag).build();
}
