/// <summary>
/// get signature from azure mobile apps(custom function)
/// </summary>
/// <param name="containerName"></param>
/// <returns></returns>
private static async Task <string> getSignature(string containerName)
{
// Get from session
var session = App.SessionRepository.GetValue <BlobSignature>($"BlobSignature{containerName}");
if (session != null && session.Expire.AddMinutes(-5) > DateTimeOffset.UtcNow)
{
return(session.Signature);
}
// get Signature from Azure mobile apps.
var signature = await CustomFunction.Get <BlobSignature>($"api/values/blobsignature/{containerName}");
App.SessionRepository.SetValue($"BlobSignature{containerName}", signature);
return(signature?.Signature);
}