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Apache Commons Validator provides the building blocks for both client side validation and server side data validation.
It may be used standalone or with a framework like Struts.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.validator;
import org.apache.commons.validator.routines.InetAddressValidator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Perform email validations.
*
* This class is a Singleton; you can retrieve the instance via the getInstance() method.
*
*
* Based on a script by Sandeep V. Tamhankar
* http://javascript.internet.com
*
*
* This implementation is not guaranteed to catch all possible errors in an email address.
* For example, an address like [email protected] will pass validator, even though there
* is no TLD "somedog"
*
.
*
* @version $Revision$
* @since Validator 1.1
* @deprecated Use the new EmailValidator in the routines package. This class
* will be removed in a future release.
*/
@Deprecated
public class EmailValidator {
private static final String SPECIAL_CHARS = "\\p{Cntrl}\\(\\)<>@,;:'\\\\\\\"\\.\\[\\]";
private static final String VALID_CHARS = "[^\\s" + SPECIAL_CHARS + "]";
private static final String QUOTED_USER = "(\"[^\"]*\")";
private static final String ATOM = VALID_CHARS + '+';
private static final String WORD = "((" + VALID_CHARS + "|')+|" + QUOTED_USER + ")";
// NOT USED private static final Pattern LEGAL_ASCII_PATTERN = Pattern.compile("^\\p{ASCII}+$");
// NOT USED private static final Pattern EMAIL_PATTERN = Pattern.compile("^(.+)@(.+)$");
private static final Pattern IP_DOMAIN_PATTERN = Pattern.compile("^\\[(.*)\\]$");
private static final Pattern TLD_PATTERN = Pattern.compile("^([a-zA-Z]+)$");
private static final Pattern USER_PATTERN = Pattern.compile("^\\s*" + WORD + "(\\." + WORD + ")*$");
private static final Pattern DOMAIN_PATTERN = Pattern.compile("^" + ATOM + "(\\." + ATOM + ")*\\s*$");
private static final Pattern ATOM_PATTERN = Pattern.compile("(" + ATOM + ")");
/**
* Singleton instance of this class.
*/
private static final EmailValidator EMAIL_VALIDATOR = new EmailValidator();
/**
* Returns the Singleton instance of this validator.
* @return singleton instance of this validator.
*/
public static EmailValidator getInstance() {
return EMAIL_VALIDATOR;
}
/**
* Protected constructor for subclasses to use.
*/
protected EmailValidator() {
super();
}
/**
* Checks if a field has a valid e-mail address.
*
* @param email The value validation is being performed on. A null
* value is considered invalid.
* @return true if the email address is valid.
*/
public boolean isValid(String email) {
return org.apache.commons.validator.routines.EmailValidator.getInstance().isValid(email);
}
/**
* Returns true if the domain component of an email address is valid.
* @param domain being validated.
* @return true if the email address's domain is valid.
*/
protected boolean isValidDomain(String domain) {
boolean symbolic = false;
// see if domain is an IP address in brackets
Matcher ipDomainMatcher = IP_DOMAIN_PATTERN.matcher(domain);
if (ipDomainMatcher.matches()) {
InetAddressValidator inetAddressValidator =
InetAddressValidator.getInstance();
if (inetAddressValidator.isValid(ipDomainMatcher.group(1))) {
return true;
}
} else {
// Domain is symbolic name
symbolic = DOMAIN_PATTERN.matcher(domain).matches();
}
if (symbolic) {
if (!isValidSymbolicDomain(domain)) {
return false;
}
} else {
return false;
}
return true;
}
/**
* Returns true if the user component of an email address is valid.
* @param user being validated
* @return true if the user name is valid.
*/
protected boolean isValidUser(String user) {
return USER_PATTERN.matcher(user).matches();
}
/**
* Validates an IP address. Returns true if valid.
* @param ipAddress IP address
* @return true if the ip address is valid.
*/
protected boolean isValidIpAddress(String ipAddress) {
Matcher ipAddressMatcher = IP_DOMAIN_PATTERN.matcher(ipAddress);
for (int i = 1; i <= 4; i++) { // CHECKSTYLE IGNORE MagicNumber
String ipSegment = ipAddressMatcher.group(i);
if (ipSegment == null || ipSegment.length() <= 0) {
return false;
}
int iIpSegment = 0;
try {
iIpSegment = Integer.parseInt(ipSegment);
} catch(NumberFormatException e) {
return false;
}
if (iIpSegment > 255) { // CHECKSTYLE IGNORE MagicNumber
return false;
}
}
return true;
}
/**
* Validates a symbolic domain name. Returns true if it's valid.
* @param domain symbolic domain name
* @return true if the symbolic domain name is valid.
*/
protected boolean isValidSymbolicDomain(String domain) {
String[] domainSegment = new String[10]; // CHECKSTYLE IGNORE MagicNumber
boolean match = true;
int i = 0;
Matcher atomMatcher = ATOM_PATTERN.matcher(domain);
while (match) {
match = atomMatcher.matches();
if (match) {
domainSegment[i] = atomMatcher.group(1);
int l = domainSegment[i].length() + 1;
domain =
(l >= domain.length())
? ""
: domain.substring(l);
i++;
}
}
int len = i;
// Make sure there's a host name preceding the domain.
if (len < 2) {
return false;
}
String tld = domainSegment[len - 1];
if (tld.length() > 1) {
if (! TLD_PATTERN.matcher(tld).matches()) {
return false;
}
} else {
return false;
}
return true;
}
/**
* Recursively remove comments, and replace with a single space. The simpler
* regexps in the Email Addressing FAQ are imperfect - they will miss escaped
* chars in atoms, for example.
* Derived From Mail::RFC822::Address
* @param emailStr The email address
* @return address with comments removed.
*/
protected String stripComments(String emailStr) {
String result = emailStr;
String commentPat = "^((?:[^\"\\\\]|\\\\.)*(?:\"(?:[^\"\\\\]|\\\\.)*\"(?:[^\"\\\\]|\111111\\\\.)*)*)\\((?:[^()\\\\]|\\\\.)*\\)/";
Pattern commentMatcher = Pattern.compile(commentPat);
while (commentMatcher.matcher(result).matches()) {
result = result.replaceFirst(commentPat, "\1 ");
}
return result;
}
}