<?php
/**
* @see https://github.com/laminas/laminas-mail for the canonical source repository
* @copyright https://github.com/laminas/laminas-mail/blob/master/COPYRIGHT.md
* @license https://github.com/laminas/laminas-mail/blob/master/LICENSE.md New BSD License
*/
namespace Laminas\Mail\Header;
final class HeaderName
{
/**
* No public constructor.
*/
private function __construct()
{
}
/**
* Filter the header name according to RFC 2822
*
* @see http://www.rfc-base.org/txt/rfc-2822.txt (section 2.2)
* @param string $name
* @return string
*/
public static function filter($name)
{
$result = '';
$tot = strlen($name);
for ($i = 0; $i < $tot; $i += 1) {
$ord = ord($name[$i]);
if ($ord > 32 && $ord < 127 && $ord !== 58) {
$result .= $name[$i];
}
}
return $result;
}
/**
* Determine if the header name contains any invalid characters.
*
* @param string $name
* @return bool
*/
public static function isValid($name)
{
$tot = strlen($name);
for ($i = 0; $i < $tot; $i += 1) {
$ord = ord($name[$i]);
if ($ord < 33 || $ord > 126 || $ord === 58) {
return false;
}
}
return true;
}
/**
* Assert that the header name is valid.
*
* Raises an exception if invalid.
*
* @param string $name
* @throws Exception\RuntimeException
* @return void
*/
public static function assertValid($name)
{
if (! self::isValid($name)) {
throw new Exception\RuntimeException('Invalid header name detected');
}
}
}