Greek VAT ID Validator for Laravel

The Greek VAT ID validator checks if a number is POTENTIALLY valid in Greek VAT ID Registry.

Validator does NOT check if VAT ID does actually belong to a person or a company, it checks only if it obeys the algorithm of a valid Greek VAT ID:

1. VAT ID = 090000045
2. Calculate sum of 0*2^8+9*2^7+0*2^6+0*2^5+0*2^4+0*2^3+0*2^2+4*2^1 = 1160
3. Calculate mod11 = 1160 % 11 = 5
4. Calculate mod10 = 5 % 10 = 5
5. mod10 (5) is equal to 5 (last digit), so VAT ID is VALID

1. VAT ID = 123456789
2. Calculate sum of 1*2^8+2*2^7+3*2^6+4*2^5+5*2^4+6*2^3+7*2^2+8*2^1 = 1004
3. Calculate mod11 = 1004 % 11 = 3
4. Calculate mod10 = 3 % 10 = 3
5. mod10 (3) is not equal to 9 (last digit), so VAT ID is INVALID

Installation

Install the package using Composer:

composer require liagkos/laravel-grvatid-validator

Laravel's service provider discovery will automatically configure the Grvatval service provider for you.

Using the grvatval validator

After installation, the grvatval validator will be available for use directly in your validation rules.

'vatid' => 'grvatval',

Within the context of a registration form, it would look like this:

return Validator::make($data, [
    'name' => 'required',
    'email' => 'required|string|email',
    'password' => 'required',
    'vatid' => 'required|grvatval'
]);

Using the Rule Object

Alternatively, you can use the Liagkos\Grvatval\Grvatval Validation Rule Object instead of the grvatval alias if you prefer:

return Validator::make($data, [
    'name' => 'required',
    'email' => 'required|string|email',
    'password' => 'required',
    'vatid' => ['required', new \Liagkos\Grvatval\Grvatval],
]);

Validation message

You will need to assign your own validation message within the resources/lang/*/validation.php file(s). Both the Rule object and the grvatval validator alias refer to the validation string validation.grvatval.

Testing

Just run the the test in tests directory. I use the orchestra/testbench along with PHPUnit.

Credits

Since I'm quite new in all Laravel stuff, I got the idea from Stephen Rees-Carten and his own valorin/pwned-validator validator, from whom I used some code and README.md stuff, modified accordingly to make this validator. Thank you Stephen, live long and propsper!