/// <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>
/// GETs the tax rate from TaxJar, given a ZipCode and a Country code
/// All other parameters are not required, but will give more information if given
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public double GetTaxRate(GetTaxRateRequest request)
{
//FIlter inputs at the top to ensure a properly generated request body
string errorText = CheckForValidInput(request, null);
string responseText;
double combinedRate = 0.0;
if (errorText == "OK")
{
try
{
//make call to TaxJar API...
TaxJarUrl.Append($"rates/{request.ZipCode}?country={request.Country}&city={request.City}");
//Append initial values; if street isnt null, append that after this.
if (request.Street != null && request.Street != "")
{
TaxJarUrl.Append($"&street={request.Street}");
}
//Create a Web Request;
var httpWebRequest = WebRequest.CreateHttp(TaxJarUrl.ToString());
//GET command
httpWebRequest.Method = "GET";
httpWebRequest.Timeout = 300000;
//Set a Custom Authorization token; The API requires something that isn't standard.
httpWebRequest.Headers["Authorization"] = $"Token token=\"{apiToken}\"";
//Call the API and get a response object
var response = (HttpWebResponse)httpWebRequest.GetResponse();
//Stream it to Read it.
var stream = response.GetResponseStream();
if (stream != null)
{
using (var streamReader = new StreamReader(stream))
{
responseText = streamReader.ReadToEnd();
}
//Parse the stream into a JObject so we can get the info wenwant from a specific node.
var contentObject = JObject.Parse(responseText);
//Return the Combined Rate member value, or the Standard Rate, if combined rate isn't present.
if (contentObject["rate"]["combined_rate"] == null)
{
combinedRate = Convert.ToDouble(contentObject["rate"]["standard_rate"]);
}
else
{
combinedRate = Convert.ToDouble(contentObject["rate"]["combined_rate"]);
}
}
}
catch (WebException wex)
{
//Toss the web exception up to the Controller to handle it.
throw wex;
}
}
else
{
switch (errorText)
{
case "US ZipCode Length":
throw new ArgumentException("US ZipCode Requires at least 3 characters", "US ZipCode");
case "CA ZipCode Length":
throw new ArgumentException("CA Zipcode must be at least 5 characters", "CA ZipCode");
case "No Country Code":
throw new ArgumentException("No Country Code Present", "Country");
}
}
//Assuming Combined_Rate is Requested, return that, or, again, the standard rate
return(combinedRate);
}
