public virtual async Task <string> GetTokenAsync(SasTokenGenerationModel model)
{
if (model.Claims.Any(c => c.Type == "token"))
{
var tenant = model.Claims.FindFirstOrEmptyValue("tenant");
var resource = model.Claims.FindFirstOrEmptyValue("resource");
var path = model.Claims.FindFirstOrEmptyValue("prefix");
var purpose = model.Claims.FindFirstOrEmptyValue("purpose");
var tokens = model.Claims.Where(k => k.Type == "token").Select(t => t.Value).ToList();
if (path.IsPresent())
{
var blob = model.Blob;
if (blob == null)
{
var account = await _storage.GetStorageAccountAsync(tenant, purpose);
var container = account.CreateCloudBlobClient()
.GetContainerReference(await _containers.GetContainerNameAsync(tenant, purpose, resource));
blob = container.GetBlockBlobReference(path);
}
await blob.LoadTokensAsync(tokens);
await blob.SaveTokensAsync(tokens);
}
else
{
var account = await _storage.GetStorageAccountAsync(tenant, purpose);
var container = account.CreateCloudBlobClient()
.GetContainerReference(await _containers.GetContainerNameAsync(tenant, purpose, resource));
await container.FetchAttributesAsync();
if (container.Metadata.ContainsKey("token"))
{
tokens.AddRange(container.Metadata["token"].Split(','));
}
container.Metadata["token"] = string.Join(",", tokens);
await container.SetMetadataAsync();
}
}
var body = string.Format("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.{0}",
Base64UrlEncode(string.Format("{{{0}}}", string.Join(",", model.Claims.GroupBy(o => o.Type).OrderBy(o => o.Key).Select(GetStringProperty)))));
var keys = await _keyProvider.Value;
using (HMACSHA256 hmacSha256 = new HMACSHA256(Convert.FromBase64String(keys.Primary)))
{
var signature = Base64UrlEncode(hmacSha256.ComputeHash(Encoding.UTF8.GetBytes(body)));
return(string.Format("{0}.{1}", body, signature));
}
}
protected virtual async Task <string> GetTokenIdsAsync(string tenant, string purpose, string resource, string prefix)
{
IDictionary <string, string> md;
var account = await _storage.GetStorageAccountAsync(tenant, purpose);
var blobClient = account.CreateCloudBlobClient();
var blobContainer = blobClient.GetContainerReference(await _containers.GetContainerNameAsync(tenant, purpose, resource));
if (prefix.IsPresent())
{
var blob = blobContainer.GetBlockBlobReference(prefix);
await blob.FetchAttributesAsync();
md = blob.Metadata;
}
else
{
await blobContainer.FetchAttributesAsync();
md = blobContainer.Metadata;
}
string tokens;
md.TryGetValue("token", out tokens);
return(tokens);
}