org.hibernate.validator.internal.util.DomainNameUtil Maven / Gradle / Ivy
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/*
* Hibernate Validator, declare and validate application constraints
*
* License: Apache License, Version 2.0
* See the license.txt file in the root directory or .
*/
package org.hibernate.validator.internal.util;
import static java.util.regex.Pattern.CASE_INSENSITIVE;
import java.net.IDN;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Marko Bekhta
* @author Guillaume Smet
*/
public final class DomainNameUtil {
/**
* This is the maximum length of a domain name. But be aware that each label (parts separated by a dot) of the
* domain name must be at most 63 characters long. This is verified by {@link IDN#toASCII(String)}.
*/
private static final int MAX_DOMAIN_PART_LENGTH = 255;
private static final String DOMAIN_CHARS_WITHOUT_DASH = "[a-z\u0080-\uFFFF0-9!#$%&'*+/=?^_`{|}~]";
private static final String DOMAIN_LABEL = "(" + DOMAIN_CHARS_WITHOUT_DASH + "-*)*" + DOMAIN_CHARS_WITHOUT_DASH + "+";
private static final String DOMAIN = DOMAIN_LABEL + "+(\\." + DOMAIN_LABEL + "+)*";
private static final String IP_DOMAIN = "[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}";
//IP v6 regex taken from http://stackoverflow.com/questions/53497/regular-expression-that-matches-valid-ipv6-addresses
private static final String IP_V6_DOMAIN = "(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))";
/**
* Regular expression for the domain part of an URL
*
* A host string must be a domain string, an IPv4 address string, or "[", followed by an IPv6 address string,
* followed by "]".
*/
private static final Pattern DOMAIN_PATTERN = Pattern.compile(
DOMAIN + "|\\[" + IP_V6_DOMAIN + "\\]", CASE_INSENSITIVE
);
/**
* Regular expression for the domain part of an email address (everything after '@')
*/
private static final Pattern EMAIL_DOMAIN_PATTERN = Pattern.compile(
DOMAIN + "|\\[" + IP_DOMAIN + "\\]|" + "\\[IPv6:" + IP_V6_DOMAIN + "\\]", CASE_INSENSITIVE
);
private DomainNameUtil() {
}
/**
* Checks the validity of the domain name used in an email. To be valid it should be either a valid host name, or an
* IP address wrapped in [].
*
* @param domain domain to check for validity
* @return {@code true} if the provided string is a valid domain, {@code false} otherwise
*/
public static boolean isValidEmailDomainAddress(String domain) {
return isValidDomainAddress( domain, EMAIL_DOMAIN_PATTERN );
}
/**
* Checks validity of a domain name.
*
* @param domain the domain to check for validity
* @return {@code true} if the provided string is a valid domain, {@code false} otherwise
*/
public static boolean isValidDomainAddress(String domain) {
return isValidDomainAddress( domain, DOMAIN_PATTERN );
}
private static boolean isValidDomainAddress(String domain, Pattern pattern) {
// if we have a trailing dot the domain part we have an invalid email address.
// the regular expression match would take care of this, but IDN.toASCII drops the trailing '.'
if ( domain.endsWith( "." ) ) {
return false;
}
Matcher matcher = pattern.matcher( domain );
if ( !matcher.matches() ) {
return false;
}
String asciiString;
try {
asciiString = IDN.toASCII( domain );
}
catch (IllegalArgumentException e) {
return false;
}
if ( asciiString.length() > MAX_DOMAIN_PART_LENGTH ) {
return false;
}
return true;
}
}