internal WebHook(string secret, string signature, string body)
{
if(string.IsNullOrEmpty(secret))
{
throw new ArgumentException("A secret must be provided", "secret");
}
this._validationErrors = new List<string>();
this._webHookData = ValidateWebHook(secret, signature, body);
}
internal WebHook(string secret, string signature, string body)
{
if (string.IsNullOrEmpty(secret))
{
throw new ArgumentException("A secret must be provided", "secret");
}
this._validationErrors = new List <string>();
this._webHookData = ValidateWebHook(secret, signature, body);
}
private WebHookData ValidateWebHook(string secret, string signature, string body)
{
WebHookData parsedWebHookData = null;
var signatureNullOrEmpth = string.IsNullOrEmpty(signature);
if (signatureNullOrEmpth == true)
{
this._validationErrors.Add("The supplied signature to check was null or empty. A signature to check must be provided.");
}
if (string.IsNullOrEmpty(body) == true)
{
this._validationErrors.Add("The supplied body to check was null or empty. A body to check must be provided.");
}
else
{
try
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
parsedWebHookData = serializer.Deserialize <WebHookData>(body);
}
catch (Exception e)
{
var validationError = string.Format("Exception occurred parsing the body as JSON: {0}{1}", Environment.NewLine, e.StackTrace);
this._validationErrors.Add(validationError);
}
}
if (parsedWebHookData != null)
{
var expectedSignature = CryptoHelper.GetHmac256(secret, body);
var signatureIsValid = (signature == expectedSignature);
if (signatureIsValid == false)
{
this._validationErrors.Add(
string.Format("The signature did not validate. Expected {0}. Got {1}", signature, expectedSignature)
);
}
}
return(parsedWebHookData);
}