com.sun.faces.ext.validator.CreditCardValidator Maven / Gradle / Ivy
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package com.sun.faces.ext.validator;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.faces.context.FacesContext;
import javax.faces.component.UIComponent;
import javax.faces.application.FacesMessage;
import java.util.Locale;
import java.io.Serializable;
/**
* A Validator that checks against a Regular Expression (which is the pattern
* property). The pattern must resolve to a String that follows the java.util.regex
* standards.
* @author driscoll
*/
public class CreditCardValidator implements Validator, Serializable {
/**
* Validate a String against a regular expression pattern... The full regex
* pattern must be matched in order to pass the validation.
* @param context Context of this request
* @param component The component wrapping this validator
* @param obj A string which will be compared to the pattern property of this validator. Must be a string.
*/
public void validate(FacesContext context, UIComponent component, Object obj) {
FacesMessage fmsg;
Locale locale = context.getViewRoot().getLocale();
if (obj == null) {
return;
}
if (!(obj instanceof String)) {
fmsg = MojarraMessageFactory.getMessage(locale,
"com.sun.faces.ext.validator.creditcardValidator.NOT_STRING",
(Object) null);
throw new ValidatorException(fmsg);
}
String input = (String) obj;
if (!input.matches("^[0-9\\ \\-]*$")) {
fmsg = MojarraMessageFactory.getMessage(locale,
"com.sun.faces.ext.validator.creditcardValidator.INVALID_CHARS",
(Object) null);
throw new ValidatorException(fmsg);
}
if (!luhnCheck(stripNonDigit(input))) {
fmsg = MojarraMessageFactory.getMessage(locale,
"com.sun.faces.ext.validator.creditcardValidator.INVALID_NUMBER",
(Object) null);
throw new ValidatorException(fmsg);
}
}
private String stripNonDigit(String s) {
return s.replaceAll(" ", "").replaceAll("-", "");
}
private boolean luhnCheck(String number) {
int sum = 0;
boolean timestwo = false;
for (int i = number.length() - 1; i >= 0; i--) {
int n = Integer.parseInt(number.substring(i, i + 1));
if (timestwo) {
n *= 2;
if (n > 9) {
n = (n % 10) + 1;
}
}
sum += n;
timestwo = !timestwo;
}
return sum % 10 == 0;
}
}