/// <summary>
/// Requests a download token for a given resource.
/// </summary>
/// <param name="resourceIdentifier"></param>
/// <param name="includeFileHash">Whether a file hash for the
/// requested resource should be calculated and assigned to the
/// <see cref="DownloadToken.Md5FileHash"/> property of the returned
/// <see cref="DownloadToken"/>.</param>
/// <returns></returns>
public DownloadToken RequestDownloadToken(string resourceIdentifier, bool includeFileHash)
{
FileInfo fileInfo = FileResolveFunc(resourceIdentifier);
if (!fileInfo.Exists)
{
string msg = String.Format("Resource [{0}] not found.", resourceIdentifier);
throw new VirtualResourceNotFoundException(msg);
}
string transferId = Guid.NewGuid().ToString();
DownloadToken dt = new DownloadToken
{
TransferId = transferId,
ResourceIdentifier = resourceIdentifier,
CreationTime = SystemTime.Now(),
ContentType = ContentUtil.ResolveContentType(fileInfo.Extension),
DownloadBlockSize = 512 * 1024, //TODO configure block size and expiration
ResourceName = fileInfo.Name,
ResourceLength = fileInfo.Length,
ExpirationTime = SystemTime.Now().AddHours(24),
Status = TransferStatus.Starting
};
//calculate number of blocks
long count = dt.ResourceLength / dt.DownloadBlockSize.Value;
if (dt.ResourceLength % dt.DownloadBlockSize != null)
{
count++;
}
dt.TotalBlockCount = count;
if (includeFileHash)
{
dt.Md5FileHash = fileInfo.CalculateMd5Hash();
}
var transfer = new DownloadTransfer(dt)
{
File = fileInfo
};
Transfers.Add(transferId, transfer);
return(dt);
}