/// <summary>
/// This method will access the license keys that belong to the user by asking them to
/// login into their account and authorize this application to get a token that will
/// return them. In rare cases, we may get a successful authorization but not successful
/// retrieval of license keys. In this case, the value tuple that is returned by this
/// method will contain a token (Item3/licenseKeyToken). Next time you try to repeat
/// the attempt, pass in the returned token into "existingToken" parameter.
/// </summary>
/// <param name="machineCode">The machine code you want to authorize.</param>
/// <param name="token">The token to access the "GetToken" method.</param>
/// <param name="appName">A user friendly name of your application.</param>
/// <param name="tokenExpires">Sets the number of days the token should be valid.</param>
/// <param name="RSAPublicKey">The RSA public key can be found here:
/// https://app.cryptolens.io/User/Security </param>
/// <param name="existingToken">If you have already called this method once
/// and received a token as a result (despite an error), you can enter it here
/// to avoid duplicate authorization by the user.</param>
public static GetLicenseKeysResult GetLicenseKeys(string machineCode, string token, string appName, int tokenExpires, string RSAPublicKey, string existingToken = null)
{
string tokenNew = existingToken;
if (string.IsNullOrEmpty(existingToken))
{
var auth = AuthMethods.CreateAuthRequest(new Scope {
GetLicenseKeys = true
}, appName, machineCode, AuthMethods.GetTokenId(token), tokenExpires);
for (int i = 0; i < 100; i++)
{
try
{
tokenNew = AuthMethods.GetToken(auth, token);
}
catch (Exception ex) { }
if (tokenNew != null)
{
break;
}
Thread.Sleep(3000);
}
if (tokenNew == null)
{
return(new GetLicenseKeysResult {
Error = "Timeout reached. The user took too long time to authorize this request."
});
}
}
GetLicenseKeysResultLinqSign result = null;
try
{
result = HelperMethods.SendRequestToWebAPI3 <GetLicenseKeysResultLinqSign>(new GetLicenseKeysModel {
Sign = true, MachineCode = machineCode
}, "/User/GetLicenseKeys", tokenNew);
}
catch (Exception ex)
{
return(new GetLicenseKeysResult {
LicenseKeyToken = tokenNew, Error = "Could not contact SKM: " + ex.InnerException
});
}
if (result == null || result.Result == ResultType.Error)
{
return(new GetLicenseKeysResult {
LicenseKeyToken = tokenNew, Error = "An error occurred in the method: " + result?.Message
});
}
var licenseKeys = Convert.FromBase64String(result.Results);
var activatedMachines = Convert.FromBase64String(result.ActivatedMachineCodes);
var date = BitConverter.GetBytes(result.SignDate);
if (!BitConverter.IsLittleEndian)
{
Array.Reverse(date);
}
var toSign = licenseKeys.Concat(activatedMachines.Concat(date)).ToArray();
// only if sign enabled.
#if NET40 || NET46 || NET35
using (var rsaVal = new RSACryptoServiceProvider())
{
rsaVal.FromXmlString(RSAPublicKey);
if (!rsaVal.VerifyData(toSign, "SHA256", Convert.FromBase64String(result.Signature)))
{
// verification failed.
return(new GetLicenseKeysResult {
LicenseKeyToken = tokenNew, Error = "Verification of the signature failed."
});
}
}
#else
using (var rsaVal = RSA.Create())
{
rsaVal.ImportParameters(SecurityMethods.FromXMLString(RSAPublicKey));
if (!rsaVal.VerifyData(toSign, Convert.FromBase64String(result.Signature),
HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1))
{
// verification failed.
return(new GetLicenseKeysResult {
LicenseKeyToken = tokenNew, Error = "Verification of the signature failed."
});
}
}
#endif
var machineCodes = JsonConvert.DeserializeObject <List <String> >(System.Text.UTF8Encoding.UTF8.GetString(activatedMachines));
if (machineCodes?.Count != 0 && !machineCodes.Contains(machineCode))
{
return(new GetLicenseKeysResult {
LicenseKeyToken = tokenNew, Error = "This machine code has not been authorized."
});
}
return(new GetLicenseKeysResult
{
Licenses = JsonConvert.DeserializeObject <List <KeyInfoResult> >(System.Text.UTF8Encoding.UTF8.GetString((licenseKeys))).Select(x => x.LicenseKey).ToList(),
LicenseKeyToken = tokenNew
});
}
