private static X509Certificate2 GetCertificate()
{
if (_signingCertificate == null)
{
var certificateKey = ConfigurationManager.AppSettings["GovTalkCertKey"];
_signingCertificate = GovTalkHelpers.GetSigningCertificate(certificateKey);
if (_signingCertificate == null)
{
throw new Exception("Could not find signing certificate");
}
}
return(_signingCertificate);
}
/// <summary>
/// Builds key exchange request xml with generated keypair's public key and calls key exchange subcontract to receive providers public key
/// </summary>S
/// <param name="fileName"></param>
/// <param name="subContractId">Key exchange subcontractId given by service provider</param>
/// <param name="signingCert">Signing certificate</param>
public void PerformExchange(String fileName, String subContractId, X509Certificate2 signingCert)
{
if (GeneratedPublicKey == null)
{
GenerateKeyPair();
}
var publicKeyXml = GeneratedPublicKey.ToXml();
var signId = GovTalkHelpers.GenerateSignId();
var firstChild = (XmlElement)publicKeyXml.FirstChild;
firstChild.SignXml(signingCert, signId);
var xmlText = GovTalkHelpers.GetXmlFile(fileName);
var requestNode = GovTalkHelpers.ComposeRequestXmlWithParamObjects(xmlText, subContractId, publicKeyXml);
var keyExchangeResponse = GovTalkCallApi.GetResponse(requestNode.OuterXml);
var keyExchangeDoc = new XmlDocument();
keyExchangeDoc.LoadXml(keyExchangeResponse);
//var logFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "XmlLogs", $"keyExch_{DateTime.Now:yyyy.MM.dd_hh.mm.ss}.xml");
//var fileName = HttpContext.Current.Server.MapPath($"~/XmlLogs/keyExch_{DateTime.Now:yyyy.MM.dd_hh.mm.ss}.xml");
//using (var file = File.CreateText(logFileName))
// keyExchangeDoc.Save(file);
var resultStatus = GovTalkHelpers.GetResponseStatus(keyExchangeDoc);
if (resultStatus.Code != "14")
{
var message = $"KeyExchange error [{resultStatus.Code}] {resultStatus.Message}";
throw new Exception(message);
}
ReceivedPublicKey = new ECPublicKey();
ReceivedPublicKey.LoadXml(keyExchangeResponse);
KeyId = ReceivedPublicKey.Id;
}
public static XmlElement LoadXml(String method, bool encrypt, IDictionary <String, Object> @params, String resultContract)
{
var methodKey = $"GovTalk_{method}";
var methodFilePath = ConfigurationManager.AppSettings[methodKey];
var xmlText = GovTalkHelpers.GetXmlFile(methodFilePath);
foreach (var pair in @params)
{
var key = String.Concat("$!{", pair.Key, "}");
var value = Convert.ToString(pair.Value);
if (pair.Value is DateTime)
{
value = XmlConvert.ToString((DateTime)pair.Value, XmlDateTimeSerializationMode.Local);
}
xmlText = xmlText.Replace(key, value);
}
var requestDoc = new XmlDocument();
requestDoc.LoadXml(xmlText);
var signId = GovTalkHelpers.GenerateSignId();
var certificate = GetCertificate();
var requestElement = (XmlElement)requestDoc.GetSubnode("Request");
requestElement.SignXml(certificate, signId);
var paramsElement = (XmlElement)requestElement.GetSubnode("Parameters");
var contractName = resultContract;
if (String.IsNullOrWhiteSpace(contractName))
{
contractName = paramsElement.FirstChild.Name;
}
if (encrypt)
{
var encKey = GetEncryptKey();
paramsElement.EncryptXml(encKey.EncKey, encKey.KeyId);
}
var response = GetResponse(requestDoc.OuterXml);
//Initialize response xml document by response string returned by service api
var responseDoc = new XmlDocument();
responseDoc.LoadXml(response);
//Deserialize 'ResultStatus' node of response xml into corresponding object
var status = GovTalkHelpers.GetResponseStatus(responseDoc);
if (status.Code != "14") //14 is OK
{
if (status.Code == "31") //TODO: 31 not found records, temporary
{
return(null);
}
throw new Exception($"{status.Code} - {status.Message}");
}
var resultNode = (XmlElement)responseDoc.GetSubnode(contractName);
if (resultNode != null && encrypt)
{
var encKey = GetEncryptKey();
resultNode.DecryptXml(encKey.EncKey);
}
var responseNode = (XmlElement)responseDoc.GetSubnode("Response");
if (!responseNode.ValidateSignature())
{
throw new Exception("Signature is not valid");
}
if (resultNode != null)
{
return(resultNode);
}
return((XmlElement)responseDoc.FirstChild);
}
