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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Mail
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/**
* @category Zend
* @package Zend_Mail
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
final class Zend_Mail_Header_HeaderValue
{
/**
* No public constructor.
*/
private function __construct()
{
}
/**
* Filter the header value according to RFC 2822
*
* @see http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
* @param string $value
* @return string
*/
public static function filter($value)
{
$result = '';
$tot = strlen($value);
// Filter for CR and LF characters, leaving CRLF + WSP sequences for
// Long Header Fields (section 2.2.3 of RFC 2822)
for ($i = 0; $i < $tot; $i += 1) {
$ord = ord($value[$i]);
if (($ord < 32 || $ord > 126)
&& $ord !== 13
) {
continue;
}
if ($ord === 13) {
if ($i + 2 >= $tot) {
continue;
}
$lf = ord($value[$i + 1]);
$sp = ord($value[$i + 2]);
if ($lf !== 10 || $sp !== 32) {
continue;
}
$result .= "\r\n ";
$i += 2;
continue;
}
$result .= $value[$i];
}
return $result;
}
/**
* Determine if the header value contains any invalid characters.
*
* @see http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
* @param string $value
* @return bool
*/
public static function isValid($value)
{
$tot = strlen($value);
for ($i = 0; $i < $tot; $i += 1) {
$ord = ord($value[$i]);
if (($ord < 32 || $ord > 126)
&& $ord !== 13
) {
return false;
}
if ($ord === 13) {
if ($i + 2 >= $tot) {
return false;
}
$lf = ord($value[$i + 1]);
$sp = ord($value[$i + 2]);
if ($lf !== 10 || $sp !== 32) {
return false;
}
$i += 2;
}
}
return true;
}
/**
* Assert that the header value is valid.
*
* Raises an exception if invalid.
*
* @param string $value
* @throws Exception\RuntimeException
* @return void
*/
public static function assertValid($value)
{
if (! self::isValid($value)) {
throw new Zend_Mail_Exception('Invalid header value detected');
}
}
}
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