public Uri GenerateLaunchURL()
{
Uri uri = new Uri(CCTERMINAL_BASE_URL);
Dictionary <string, string> parameters = this.GenerateParams();
return(ChargeUtils.UriWithAdditionalParams(uri, parameters));
}
public string CreateAndStoreNonce()
{
string nonce = ChargeUtils.GenerateNonce();
ChargeUtils.SaveLocalData(ChargeResponse.Keys.NONCE, nonce);
return(nonce);
}
private const int NONCE_LENGTH = 27; // same size as base64-encoded SHA1 seems good
public static string GenerateNonce()
{
var nonceString = new StringBuilder();
for (int i = 0; i < NONCE_LENGTH; i++)
{
uint position = ChargeUtils.GenerateRandomNumber() % (uint)NONCE_ALPHABET.Length;
nonceString.Append(NONCE_ALPHABET[(int)position]);
}
return(nonceString.ToString());
}
public void SetReturnURL(string returnURL, Dictionary <string, string> extraParams)
{
Uri uri = new Uri(returnURL);
// genereate nonce and add it to extra params
if (null == extraParams)
{
extraParams = new Dictionary <string, string>();
}
string nonce = CreateAndStoreNonce();
extraParams.Add(ChargeResponse.Keys.NONCE, nonce);
this.ReturnURL = ChargeUtils.UriWithAdditionalParams(uri, extraParams).ToString();
}
private void ValidateNonce(string nonce)
{
// Validate nonce
string savedNonce = (string)ChargeUtils.RetrieveLocalData(Keys.NONCE);
if (String.IsNullOrEmpty(savedNonce))
{
throw new ChargeException("No nonce was saved.");
}
if (!nonce.Equals(savedNonce, StringComparison.Ordinal))
{
throw new ChargeException("Nonce doesn't match.");
}
// Nonce validated, clear saved nonce
ChargeUtils.DeleteLocalData(Keys.NONCE);
}
public static Uri UriWithAdditionalParams(Uri uri, Dictionary <string, string> newParameters)
{
Dictionary <string, string> parameters;
if (String.IsNullOrEmpty(uri.Query))
{
parameters = newParameters;
}
else
{
// extract existing query string parameters
parameters = ChargeUtils.ParseQueryString(uri.Query);
// add new parameters -- new parameters will overwrite old ones if key already exists
foreach (var param in newParameters)
{
parameters[param.Key] = param.Value;
}
}
if (parameters.Count == 0)
{
// no parameters = no query string.
return(uri);
}
// loop through parameters to generate param list
List <string> paramList = new List <string>();
foreach (var param in parameters)
{
if (param.Value != null)
{
paramList.Add(
String.Format(
CultureInfo.InvariantCulture,
"{0}={1}",
Uri.EscapeDataString(param.Key),
Uri.EscapeDataString(param.Value)
)
);
}
}
// join param list with & and prefix it with ?
string queryString = String.Join("&", paramList);
queryString = String.Format(CultureInfo.InvariantCulture, "?{0}", queryString);
String uriString = null;
if (uri.IsDefaultPort)
{
uriString = String.Format(
CultureInfo.InvariantCulture,
"{0}://{1}{2}{3}",
uri.Scheme,
uri.Host,
uri.AbsolutePath,
queryString);
}
else
{
uriString = String.Format(
CultureInfo.InvariantCulture,
"{0}://{1}:{2}{3}{4}",
uri.Scheme,
uri.Host,
uri.Port,
uri.AbsolutePath,
queryString);
}
return(new Uri(uriString));
}
public ChargeResponse(Uri responseUri)
{
if (null == responseUri)
{
throw new ArgumentNullException("uri");
}
string query = responseUri.Query;
if (String.IsNullOrEmpty(query))
{
throw new ChargeException("Invalid Request: Query string is empty");
}
Dictionary<string, string> parameters = ChargeUtils.ParseQueryString(query);
if (parameters.Count == 0)
{
throw new ChargeException("Invalid Request: Query string has no params");
}
// Validate nonce
if (!parameters.ContainsKey(Keys.NONCE) || String.IsNullOrEmpty(parameters[Keys.NONCE]))
{
throw new ChargeException("No nonce was provided.");
}
string nonce = parameters[Keys.NONCE];
this.ValidateNonce(nonce);
// Parse parameters
if (parameters.ContainsKey(Keys.AMOUNT))
{
this.Amount = parameters[Keys.AMOUNT];
}
if (parameters.ContainsKey(Keys.CARD_TYPE))
{
this.CardType = parameters[Keys.CARD_TYPE];
}
if (parameters.ContainsKey(Keys.CURRENCY))
{
this.Currency = parameters[Keys.CURRENCY];
}
if (parameters.ContainsKey(Keys.ERROR_MESSAGE))
{
this.ErrorMessage = parameters[Keys.ERROR_MESSAGE];
}
if (parameters.ContainsKey(Keys.REDACTED_CARD_NUMBER))
{
this.RedactedCardNumber = parameters[Keys.REDACTED_CARD_NUMBER];
}
if (parameters.ContainsKey(Keys.RESPONSE_TYPE))
{
this.ResponseType = parameters[Keys.RESPONSE_TYPE];
}
if (parameters.ContainsKey(Keys.TAX_AMOUNT))
{
this.TaxAmount = parameters[Keys.TAX_AMOUNT];
}
if (parameters.ContainsKey(Keys.TAX_RATE))
{
this.TaxRate = parameters[Keys.TAX_RATE];
}
if (parameters.ContainsKey(Keys.TIP_AMOUNT))
{
this.TipAmount = parameters[Keys.TIP_AMOUNT];
}
if (parameters.ContainsKey(Keys.TRANSACTION_ID))
{
this.TransactionId = parameters[Keys.TRANSACTION_ID];
}
this.ValidateFields();
if (this.ResponseType == Type.APPROVED)
{
this.ResponseCode = Code.APPROVED;
}
else if (this.ResponseType == Type.CANCELLED)
{
this.ResponseCode = Code.CANCELLED;
}
else if (this.ResponseType == Type.DECLINED)
{
this.ResponseCode = Code.DECLINED;
}
else
{
this.ResponseCode = Code.ERROR;
}
this.ExtraParams = new Dictionary<string, string>();
foreach (var parameter in parameters)
{
if (!parameter.Key.StartsWith("ifcc_", StringComparison.Ordinal))
{
this.ExtraParams[parameter.Key] = parameter.Value;
}
}
}
