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added vat number length check

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FH 2022-04-06 12:02:25 +02:00
parent c0c87580d4
commit 22f39b0099
4 changed files with 176 additions and 163 deletions
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2
FCS.Lib.Utility.csproj
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@ -56,7 +56,7 @@
<Compile Include="IRepository.cs" />
<Compile Include="IAsyncReadonlyRepo.cs" />
<Compile Include="IRepositoryEx.cs" />
<Compile Include="VatUtils.cs" />
<Compile Include="VatFormatValidator.cs" />
<Compile Include="Mogrifiers.cs" />
<Compile Include="QueryHelper.cs" />
<Compile Include="StringOptions.cs" />

4
Properties/AssemblyInfo.cs
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@ -16,5 +16,5 @@ using System.Runtime.InteropServices;
[assembly: ComVisible(false)]
[assembly: Guid("aaf08873-14e5-411d-8ec8-629782ac8f03")]
[assembly: AssemblyVersion("2.1.22093.1132")]
[assembly: AssemblyFileVersion("2.1.22093.1132")]
[assembly: AssemblyVersion("2.1.22095.1512")]
[assembly: AssemblyFileVersion("2.1.22095.1512")]

173
VatFormatValidator.cs Normal file
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@ -0,0 +1,173 @@
using System.Linq;
namespace FCS.Lib.Utility
{
public static class VatFormatValidator
{
// https://ec.europa.eu/taxation_customs/vies/faqvies.do#item_11
// https://ec.europa.eu/taxation_customs/vies/
public static bool CheckVat(string countryCode, string vatNumber)
{
return countryCode.ToUpperInvariant() switch
{
"DK" => ValidateFormatDk(vatNumber),
"NO" => ValidateFormatNo(vatNumber),
"SE" => ValidateFormatSe(vatNumber),
_ => false
};
}
private static bool ValidateFormatDk(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Denmark
// 8 digits 0 to 9
// C1..C7
// C8 check-digit MOD11
// C1 > 0
// R = (2*C1 + 7*C2 + 6*C3 + 5*C4 + 4*C5 + 3*C6 + 2*C7 + C8)
return (int)char.GetNumericValue(vatNumber[0]) == 1 && vatNumber.Length == 8 && ValidateMod11(vatNumber);
}
private static bool ValidateFormatNo(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Norway
// 12 digits
// C1..C8 random 0 to 9
// C9 check-digit MOD11
// C10 C11 C12 chars == MVA
return vatNumber.Length >= 9 && ValidateMod11(vatNumber.Substring(0, 8));
}
private static bool ValidateFormatSe(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Sweden
// 12 digits 0 to 9
// C10 = (10 – (18 + 5 + 1 + 8 + 4)MOD10 10) MOD10
// R = S1 + S3 + S5 + S7 + S9
// Si = int(Ci/5) + (Ci*2)MOD10)
// https://www.skatteverket.se/skatter/mervardesskattmoms/momsregistreringsnummer.4.18e1b10334ebe8bc80002649.html
// C11 C12 == 01 (De två sista siffrorna är alltid 01)
if (vatNumber.Length != 12 || vatNumber.Substring(10) != "01" || long.Parse(vatNumber) == 0)
return false;
var r = new[] { 0, 2, 4, 5, 8 }
.Sum(m => (int)char.GetNumericValue(vatNumber[m]) / 5 +
(int)char.GetNumericValue(vatNumber[m]) * 2 % 10);
var c1 = new[] { 1, 3, 5, 7 }.Sum(m => (int)char.GetNumericValue(vatNumber[m]));
var c10 = (10 - (r + c1) % 10) % 10;
return $"{vatNumber.Substring(0,9)}{c10}{vatNumber.Substring(9,1)}" == vatNumber;
}
private static bool ValidateMod11(string number)
{
if (long.Parse(number) == 0)
return false;
var sum = 0;
for (int i = number.Length - 1, multiplier = 1; i >= 0; i--)
{
// Console.WriteLine($"char: {number[i]} multiplier: {multiplier}");
sum += (int)char.GetNumericValue(number[i]) * multiplier;
if (++multiplier > 7) multiplier = 2;
}
return sum % 11 == 0;
}
//private static string SanitizeVatNumber(string vatNumber)
//{
// var washing = vatNumber.Replace(" ", "").Replace("-", "").ToUpperInvariant();
// var result = washing.Replace("DK", "").Replace("NO", "").Replace("SE","") ;
// if (result.Contains("MVA"))
// result = result.Replace("MVA", "");
// return result.Length switch
// {
// >= 10 => vatNumber[..10],
// < 10 => result
// };
//}
//private static bool ValidateMod10(string number)
//{
// if (long.Parse(number) == 0)
// return false;
// var nDigits = number.Length;
// var nSum = 0;
// var isSecond = false;
// for (var i = nDigits - 1; i >= 0; i--)
// {
// var d = (int)char.GetNumericValue(number[i]) - '0';
// if (isSecond)
// d *= 2;
// nSum += d / 10;
// nSum += d % 10;
// isSecond = !isSecond;
// }
// return nSum % 10 == 0;
//}
//private static string GetMod10CheckDigit(string number)
//{
// var sum = 0;
// var alt = true;
// var digits = number.ToCharArray();
// for (var i = digits.Length - 1; i >= 0; i--)
// {
// var curDigit = digits[i] - 48;
// if (alt)
// {
// curDigit *= 2;
// if (curDigit > 9)
// curDigit -= 9;
// }
// sum += curDigit;
// alt = !alt;
// }
// return sum % 10 == 0 ? "0" : (10 - sum % 10).ToString();
//}
//private string AddMod11CheckDigit(string number)
//{
// return number + GetMod11CheckDigit(number);
//}
//private static string GetMod11CheckDigit(string number)
//{
// var sum = 0;
// for (int i = number.Length - 1, multiplier = 2; i >= 0; i--)
// {
// sum += (int)char.GetNumericValue(number[i]) * multiplier;
// if (++multiplier > 7) multiplier = 2;
// }
// var modulo = sum % 11;
// return modulo is 0 or 1 ? "0" : (11 - modulo).ToString();
//}
//private static bool CheckLuhn(string vatNumber)
//{
// // https://www.geeksforgeeks.org/luhn-algorithm/
// var nDigits = vatNumber.Length;
// var nSum = 0;
// var isSecond = false;
// for (var i = nDigits - 1; i >= 0; i--)
// {
// var d = (int)char.GetNumericValue(vatNumber[i]) - '0';
// if (isSecond)
// d *= 2;
// // We add two digits to handle
// // cases that make two digits
// // after doubling
// nSum += d / 10;
// nSum += d % 10;
// isSecond = !isSecond;
// }
// return nSum % 10 == 0;
//}
}
}

160
VatUtils.cs
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@ -1,160 +0,0 @@
using System.Linq;
namespace FCS.Lib.Utility
{
public static class VatUtils
{
public static bool CheckVat(string countryCode, string vatNumber)
{
return countryCode.ToUpperInvariant() switch
{
"DK" => CheckVatNumberDenmark(vatNumber),
"NO" => CheckVatNumberNorway(vatNumber),
"SE" => CheckVatNumberSweden(vatNumber),
_ => false
};
}
public static bool CheckVatNumberDenmark(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Denmark
// 8 digits 0 to 9
// C1..C7
// C8 Modulo 11 check digit
// C1 > 0
// R = (2*C1 + 7*C2 + 6*C3 + 5*C4 + 4*C5 + 3*C6 + 2*C7 + C8)
return (int)char.GetNumericValue(vatNumber[0]) == 1 && vatNumber.Length == 8 && ValidateMod11(vatNumber);
}
public static bool CheckVatNumberNorway(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Norway
// 12 digits
// C1..C8 random 0 to 9
// C9 Check MOD11
// C10 C11 C12 chars == MVA
return vatNumber.Length >= 9 && ValidateMod11(vatNumber.Substring(0, 8));
}
public static bool CheckVatNumberSweden(string vatNumber)
{
// https://wiki.scn.sap.com/wiki/display/CRM/Sweden
// 12 digits 0 to 9
// C1 = (10 - (R + C2 + C4 + C6 + C8) modulo 10) modulo 10
// R = S1 + S3 + S5 + S7 + S9
// Si = int(Ci/5) + (Ci*2) modulo 10)
// C11 C12 >= 01 <= 94
//
// Validate full string using Luhn algoritm
// 12 chars
if (vatNumber.Length != 12 || vatNumber.Substring(10) != "01" || long.Parse(vatNumber) == 0)
return false;
var r = new[] { 0, 2, 4, 5, 8 }
.Sum(m => (int)char.GetNumericValue(vatNumber[m]) / 5 +
(int)char.GetNumericValue(vatNumber[m]) * 2 % 10);
var c1 = new[] { 1, 3, 5, 7 }.Sum(m => (int)char.GetNumericValue(vatNumber[m]));
var c10 = (10 - (r + c1) % 10) % 10;
return $"{vatNumber.Substring(0,9)}{c10}{vatNumber.Substring(9,1)}" == vatNumber;
}
public static bool ValidateMod11(string number)
{
if (long.Parse(number) == 0)
return false;
var sum = 0;
for (int i = number.Length - 1, multiplier = 1; i >= 0; i--)
{
// Console.WriteLine($"char: {number[i]} multiplier: {multiplier}");
sum += (int)char.GetNumericValue(number[i]) * multiplier;
if (++multiplier > 7) multiplier = 2;
}
return sum % 11 == 0;
}
public static bool ValidateMod10(string number)
{
if (long.Parse(number) == 0)
return false;
var nDigits = number.Length;
var nSum = 0;
var isSecond = false;
for (var i = nDigits - 1; i >= 0; i--)
{
var d = (int)char.GetNumericValue(number[i]) - '0';
if (isSecond)
d *= 2;
nSum += d / 10;
nSum += d % 10;
isSecond = !isSecond;
}
return nSum % 10 == 0;
}
public static string GetMod10CheckDigit(string number)
{
var sum = 0;
var alt = true;
var digits = number.ToCharArray();
for (var i = digits.Length - 1; i >= 0; i--)
{
var curDigit = digits[i] - 48;
if (alt)
{
curDigit *= 2;
if (curDigit > 9)
curDigit -= 9;
}
sum += curDigit;
alt = !alt;
}
return sum % 10 == 0 ? "0" : (10 - sum % 10).ToString();
}
public static string AddMod11CheckDigit(string number)
{
return number + GetMod11CheckDigit(number);
}
public static string GetMod11CheckDigit(string number)
{
var sum = 0;
for (int i = number.Length - 1, multiplier = 2; i >= 0; i--)
{
sum += (int)char.GetNumericValue(number[i]) * multiplier;
if (++multiplier > 7) multiplier = 2;
}
var modulo = sum % 11;
return modulo is 0 or 1 ? "0" : (11 - modulo).ToString();
}
private static bool CheckLuhn(string vatNumber)
{
// https://www.geeksforgeeks.org/luhn-algorithm/
var nDigits = vatNumber.Length;
var nSum = 0;
var isSecond = false;
for (var i = nDigits - 1; i >= 0; i--)
{
var d = (int)char.GetNumericValue(vatNumber[i]) - '0';
if (isSecond)
d *= 2;
// We add two digits to handle
// cases that make two digits
// after doubling
nSum += d / 10;
nSum += d % 10;
isSecond = !isSecond;
}
return nSum % 10 == 0;
}
}
}