public static void AuthorizeForRole(string role)
{
var pctx = ContextRegistry.ContextsOf("Principal").FirstOrDefault();
if (null == pctx)
{
throw new AuthenticationException("No authenticated identity");
}
var id = pctx.Segments.First();
ApplicationPrincipal pr;
if (!_cachedPrincipals.MaybeGetItem(id, out pr))
{
using (
var dc =
DocumentStoreLocator.ResolveOrRoot(
ContextualAuthorizationConfiguration.PrincipalsStore))
{
pr = dc.Load <ApplicationPrincipal>(id);
_cachedPrincipals.Add(id, pr);
}
}
if (!pr.IsInRole(role))
{
throw new SecurityException(string.Format("principal {0} is not in role {1}", id, role));
}
}
public byte[] DownloadData(string file, int startRange, int length)
{
Debug.Assert(!string.IsNullOrWhiteSpace(file));
Debug.Assert(startRange >= 0);
Debug.Assert(length < _memoryHog);
Stream data;
if (!_cache.MaybeGetItem(file, out data))
{
_log.InfoFormat("Downloading {0} from blob storage and caching", file);
var blobs = Client.FromConfig().ForBlobs();
var c = blobs.GetContainerReference(_container);
var b = c.GetBlobReference(file);
using (MemoryStream ms = new MemoryStream())
{
b.DownloadToStream(ms);
_cache.Add(file, ms);
data = ms;
}
}
else
{
_dblog.InfoFormat("Cache hit for file download {0}", file);
}
if (startRange >= data.Length)
{
return(null);
}
byte[] retval = new byte[length];
data.Seek(startRange, SeekOrigin.Begin);
int read = data.Read(retval, 0, length);
if (read < length)
{
using (MemoryStream ms = new MemoryStream())
{
ms.Write(retval, 0, read);
retval = ms.ToArray();
}
}
return(retval);
}
public byte[] RetrieveKey(string key, bool fromCache = true)
{
byte[] retval = null;
bool found = false;
if (fromCache)
{
_dblog.InfoFormat("Found image {0} in cache", key);
lock (_cache)
{
found = _cache.MaybeGetItem(key, out retval);
}
}
if (!found)
{
_log.InfoFormat("Retrieving image {0} from blob storage into cache", key);
return(RetrieveFromBlobStorage(key));
}
return(retval);
}
