88 lines
2.6 KiB
PHP
88 lines
2.6 KiB
PHP
<?php
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/**
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* Copyright 2014 Openstack Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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class EmailValidator {
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/**
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Validate an email address.
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Provide email address (raw input)
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Returns true if the email address has the email
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address format and the domain exists.
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*/
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public function validEmail($email)
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{
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$isValid = true;
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$atIndex = strrpos($email, "@");
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if (is_bool($atIndex) && !$atIndex)
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{
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$isValid = false;
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}
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else
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{
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$domain = substr($email, $atIndex+1);
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$local = substr($email, 0, $atIndex);
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$localLen = strlen($local);
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$domainLen = strlen($domain);
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if ($localLen < 1 || $localLen > 64)
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{
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// local part length exceeded
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$isValid = false;
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}
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else if ($domainLen < 1 || $domainLen > 255)
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{
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// domain part length exceeded
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$isValid = false;
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}
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else if ($local[0] == '.' || $local[$localLen-1] == '.')
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{
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// local part starts or ends with '.'
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$isValid = false;
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}
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else if (preg_match('/\\.\\./', $local))
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{
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// local part has two consecutive dots
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$isValid = false;
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}
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else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain))
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{
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// character not valid in domain part
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$isValid = false;
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}
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else if (preg_match('/\\.\\./', $domain))
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{
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// domain part has two consecutive dots
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$isValid = false;
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}
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else if
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(!preg_match('/^(\\\\.|[A-Za-z0-9!#%&`_=\\/$\'*+?^{}|~.-])+$/',
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str_replace("\\\\","",$local)))
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{
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// character not valid in local part unless
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// local part is quoted
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if (!preg_match('/^"(\\\\"|[^"])+"$/',
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str_replace("\\\\","",$local)))
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{
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$isValid = false;
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}
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}
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if ($isValid && !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A")))
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{
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// domain not found in DNS
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$isValid = false;
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}
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}
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return $isValid;
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}
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} |