/*
* Build signature for the pingback received
*
* @param Dictionary<string, string> parameters
* @param string secret Paymentwall Secret Key
* @param int version Paymentwall Signature Version
* @return string
*/
public string CalculateSignature(Dictionary <string, string> signatureParamsToSign, string secret, int version)
{
string baseString = "";
signatureParamsToSign.Remove("sig");
if (version == PWPingback.SIGNATURE_VERSION_2 || version == PWPingback.SIGNATURE_VERSION_3)
{
signatureParamsToSign = signatureParamsToSign.OrderBy(d => d.Key, StringComparer.Ordinal).ToDictionary(d => d.Key, d => d.Value);
}
foreach (KeyValuePair <string, string> kvp in signatureParamsToSign)
{
baseString += kvp.Key + "=" + kvp.Value;
}
baseString += secret;
if (version == PWPingback.SIGNATURE_VERSION_3)
{
return(PWPingback.getHash(baseString, "sha256"));
}
else
{
return(PWPingback.getHash(baseString, "md5"));
}
}
/**
* @return bool
*/
public bool IsSignatureValid()
{
string signature = "";
Dictionary <string, string> signatureParamsToSign = new Dictionary <string, string>();
if (this.parameters.ContainsKey("sig"))
{
signature = this.parameters["sig"];
}
else
{
signature = null;
}
List <string> signatureParams = new List <string>();
if (PWPingback.GetApiType() == PWPingback.API_VC)
{
signatureParams.AddRange(new string[] { "uid", "currency", "type", "ref" });
}
else if (PWPingback.GetApiType() == PWPingback.API_GOODS)
{
signatureParams.AddRange(new string[] { "uid", "goodsid", "slength", "speriod", "type", "ref" });
}
else //API_CART
{
signatureParams.AddRange(new string[] { "uid", "goodsid", "type", "ref" });
this.parameters["sign_version"] = PWPingback.SIGNATURE_VERSION_2.ToString();
}
if (!this.parameters.ContainsKey("sign_version")) //Check if signature version 1
{
foreach (string field in signatureParams)
{
if (this.parameters[field] != null)
{
signatureParamsToSign.Add(field, this.parameters[field]);
}
else
{
signatureParamsToSign.Add(field, null);
}
}
this.parameters["sign_version"] = PWPingback.SIGNATURE_VERSION_1.ToString();
}
else
{
signatureParamsToSign = this.parameters;
}
string signatureCalculated = this.CalculateSignature(signatureParamsToSign, PWPingback.GetSecretKey(), Convert.ToInt32(this.parameters["sign_version"]));
return(signatureCalculated == signature);
}
/*
* Get required parameters based on API
*
* @return List<string>
*/
public List <string> GetRequiredParams()
{
List <string> requiredParams = new List <string>();
if (PWPingback.GetApiType() == PWPingback.API_VC)
{
requiredParams.AddRange(new string[] { "uid", "currency", "type", "ref", "sig" });
}
else if (PWPingback.GetApiType() == PWPingback.API_GOODS)
{
requiredParams.AddRange(new string[] { "uid", "goodsid", "type", "ref", "sig" });
}
else //API_CART
{
requiredParams.AddRange(new string[] { "uid", "goodsid[0]", "type", "ref", "sig" });
}
return(requiredParams);
}
