1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
<?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)) {
#require_once 'Zend/Mail/Exception.php';
throw new Zend_Mail_Exception('Invalid header value detected');
}
}
}