public override Uri Identify(IRepository repository, Stream originalContentStream, ITypedContent typedContent)
{
Stream contentStream = originalContentStream;
string fileExtension = null;
if (typedContent != null)
{
fileExtension = typedContent.FileExtension;
Func <Stream, Stream> streamPreprocessorFunc;
if (_StreamIdentifierPreprocessorFuncs.TryGetValue(typedContent.ContentType, out streamPreprocessorFunc))
{
contentStream = streamPreprocessorFunc(originalContentStream);
}
}
byte[] hash = _HashAlgorithm.ComputeHash(contentStream);
string relativeUri = string.Concat(
_Encoding
.Encode(
BitConverter.ToUInt64(hash, 0),
false)
.ToLower(),
"-",
_Encoding
.Encode(
BitConverter.ToUInt64(hash, 8),
false)
.ToLower());
for (int i = _FolderDepth; i > 0; i--)
{
relativeUri = relativeUri.Insert(i, Path.DirectorySeparatorChar.ToString());
}
if (fileExtension != null)
{
relativeUri = Path.ChangeExtension(relativeUri, fileExtension);
}
return(new Uri(repository.Uri, relativeUri));
}
/// <summary>
/// Generates the activation code.
/// </summary>
/// <returns></returns>
private async Task <string> GenerateActivationCode()
{
List <string> profanityList = appSettings.ProfanityList;
string result;
ushort deploymentNumber = appSettings.DeploymentNumber;
var rand = new RngCspRandom();
do
{
ulong token = deploymentNumber;
token <<= 8 * sizeof(uint);
uint nonce = rand.Next(100000000, 999999999);
token |= nonce;
var encoder = new CrockfordBase32Encoding();
result = encoder.Encode(token, false);
}while (result.ContainsAny(profanityList.ToArray()) || !(await IsActivationCodeUnique(result)));
return(result);
}