/// <summary>
/// This function is used purely to check the inputs for each given function, to ensure that the request bodies are built properly.
/// </summary>
/// <param name="rateRequest"></param>
/// <param name="calculateRequest"></param>
/// <returns></returns>
private string CheckForValidInput(GetTaxRateRequest rateRequest = null, CalculateTaxRequest calculateRequest = null)
{
if (rateRequest != null)
{
switch (rateRequest.Country)
{
case "US":
if (rateRequest.ZipCode.Length < 3)
{
return("US ZipCode Length");
}
break;
case "CA":
if (rateRequest.ZipCode.Length < 5)
{
return("CA ZipCode Length");
}
break;
case "":
case null:
return("No Country Code");
}
}
if (calculateRequest != null)
{
//If Country is not correct, throw an error; no need to check the switch for that
if (calculateRequest.from_country.Length < 2 || calculateRequest.to_country.Length < 2)
{
return("Short Country Code");
}
if (calculateRequest.from_state.Length < 2 || calculateRequest.to_state.Length < 2)
{
return("Short State Code");
}
if (calculateRequest.from_country == "US" && calculateRequest.from_zip.Length < 3 || calculateRequest.to_zip.Length < 3)
{
return("US ZipCode Length");
}
if (calculateRequest.from_country == "CA" && calculateRequest.from_zip.Length < 5 || calculateRequest.from_zip.Length < 5)
{
return("CA ZipCode Length");
}
if (calculateRequest.line_items.Count < 1)
{
return("No Line Items");
}
}
return("OK");
}
/// <summary>
/// POSTS a request to the TaxJar API to return all applicable taxable information on a given order.
/// This will return a double value with the total amount of tax to collect
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public double CalculateTaxForOrder(CalculateTaxRequest request)
{
//Filter Inputs
string errorText = CheckForValidInput(null, request);
string responseText;
double amountToCollect = 0.0;
if (errorText == "OK")
{
try
{
//Finish Url
TaxJarUrl.Append("taxes");
//Create HTTP Web Request
var httpWebRequest = WebRequest.CreateHttp(TaxJarUrl.ToString());
httpWebRequest.Method = "POST";
httpWebRequest.Timeout = 300000;
//Build Custom Auth header
httpWebRequest.Headers["Authorization"] = $"Token token=\"{apiToken}\"";
httpWebRequest.ContentType = "application/json";
//pass JSON body for POST
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
//Serialize the request with the Serializer settings that Ignore null / default values
streamWriter.Write(JsonConvert.SerializeObject(request, settings));
}
//Get Response from POST
var response = (HttpWebResponse)httpWebRequest.GetResponse();
var stream = response.GetResponseStream();
if (stream != null)
{
using (var streamReader = new StreamReader(stream))
{
responseText = streamReader.ReadToEnd();
}
//Parse object for easy access
var contentObject = JObject.Parse(responseText);
//Grab Amount to collect value from parsed object
amountToCollect = Convert.ToDouble(contentObject["tax"]["amount_to_collect"]);
}
}
catch (WebException wex)
{
//Throw web exceptions to the Controller
throw wex;
}
}
else
{
switch (errorText)
{
case "Short Country Code":
throw new ArgumentException("Country Code must be two characters", "Country");
case "Short State Code":
throw new ArgumentException("State Code must be two characters", "State");
case "US ZipCode Length":
throw new ArgumentException("US Zipcodes must be at least 3 characters in length", "US ZipCode");
case "CA ZipCode Length":
throw new ArgumentException("CA Zipcodes must be at least 5 character in length", "CA ZipCode");
case "No Line Items":
throw new ArgumentException("Order Requests must have at least one line item", "Line_Items");
}
}
//return Amount_to_Collect
return(amountToCollect);
}
