public LicenseFile TryGetLicense()
{
var environment = Environment.GetEnvironmentVariable(Constants.ENV_NAME);
if (string.IsNullOrWhiteSpace(environment))
{
throw new NoSidLicenseEnvironmentVariableException();
}
if (!Directory.Exists(environment))
{
throw new BadSidLicenseEnvironmentException();
}
var pfxFile = Path.Combine(environment, _pfxFile);
if (!File.Exists(pfxFile))
{
throw new NoCertificateException();
}
var licenseFile = Path.Combine(environment, Constants.LICENSE_FILE_NAME);
if (!File.Exists(licenseFile))
{
throw new LicenseFileNotFoundException();
}
var licenseContent = File.ReadAllText(licenseFile);
var certificate = new X509Certificate2(pfxFile);
var splittedLicenseContent = licenseContent.Split('.');
if (!CertificateHelper.CheckSignature(certificate, splittedLicenseContent.First(), splittedLicenseContent.Last()))
{
throw new BadLicenseFileException();
}
return(JsonConvert.DeserializeObject <LicenseFile>(Encoding.UTF8.GetString(Convert.FromBase64String(splittedLicenseContent.First()))));
}