ExpiryDateValidator.java

package com.checkout.paymentgw.payment.api.validation;

import com.checkout.paymentgw.payment.api.dto.PostPaymentRequest;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

import java.time.YearMonth;

public class ExpiryDateValidator implements ConstraintValidator<ValidExpiryDate, PostPaymentRequest> {

    @Override
    public boolean isValid(PostPaymentRequest req, ConstraintValidatorContext ctx) {
        if (req == null || req.getExpiryMonth() == null || req.getExpiryYear() == null) {
            // Field-level @NotNull will report the specific missing field.
            return true;
        }
        try {
            YearMonth expiry = YearMonth.of(req.getExpiryYear(), req.getExpiryMonth());
            return expiry.isAfter(YearMonth.now()) || expiry.equals(YearMonth.now());
        } catch (Exception e) {
            return false;
        }
    }
}