diff options
Diffstat (limited to 'inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/URI/Host.php')
-rw-r--r-- | inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/URI/Host.php | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/URI/Host.php b/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/URI/Host.php new file mode 100644 index 00000000..01457785 --- /dev/null +++ b/inc/3rdparty/htmlpurifier/HTMLPurifier/AttrDef/URI/Host.php | |||
@@ -0,0 +1,128 @@ | |||
1 | <?php | ||
2 | |||
3 | /** | ||
4 | * Validates a host according to the IPv4, IPv6 and DNS (future) specifications. | ||
5 | */ | ||
6 | class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef | ||
7 | { | ||
8 | |||
9 | /** | ||
10 | * IPv4 sub-validator. | ||
11 | * @type HTMLPurifier_AttrDef_URI_IPv4 | ||
12 | */ | ||
13 | protected $ipv4; | ||
14 | |||
15 | /** | ||
16 | * IPv6 sub-validator. | ||
17 | * @type HTMLPurifier_AttrDef_URI_IPv6 | ||
18 | */ | ||
19 | protected $ipv6; | ||
20 | |||
21 | public function __construct() | ||
22 | { | ||
23 | $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4(); | ||
24 | $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6(); | ||
25 | } | ||
26 | |||
27 | /** | ||
28 | * @param string $string | ||
29 | * @param HTMLPurifier_Config $config | ||
30 | * @param HTMLPurifier_Context $context | ||
31 | * @return bool|string | ||
32 | */ | ||
33 | public function validate($string, $config, $context) | ||
34 | { | ||
35 | $length = strlen($string); | ||
36 | // empty hostname is OK; it's usually semantically equivalent: | ||
37 | // the default host as defined by a URI scheme is used: | ||
38 | // | ||
39 | // If the URI scheme defines a default for host, then that | ||
40 | // default applies when the host subcomponent is undefined | ||
41 | // or when the registered name is empty (zero length). | ||
42 | if ($string === '') { | ||
43 | return ''; | ||
44 | } | ||
45 | if ($length > 1 && $string[0] === '[' && $string[$length - 1] === ']') { | ||
46 | //IPv6 | ||
47 | $ip = substr($string, 1, $length - 2); | ||
48 | $valid = $this->ipv6->validate($ip, $config, $context); | ||
49 | if ($valid === false) { | ||
50 | return false; | ||
51 | } | ||
52 | return '[' . $valid . ']'; | ||
53 | } | ||
54 | |||
55 | // need to do checks on unusual encodings too | ||
56 | $ipv4 = $this->ipv4->validate($string, $config, $context); | ||
57 | if ($ipv4 !== false) { | ||
58 | return $ipv4; | ||
59 | } | ||
60 | |||
61 | // A regular domain name. | ||
62 | |||
63 | // This doesn't match I18N domain names, but we don't have proper IRI support, | ||
64 | // so force users to insert Punycode. | ||
65 | |||
66 | // There is not a good sense in which underscores should be | ||
67 | // allowed, since it's technically not! (And if you go as | ||
68 | // far to allow everything as specified by the DNS spec... | ||
69 | // well, that's literally everything, modulo some space limits | ||
70 | // for the components and the overall name (which, by the way, | ||
71 | // we are NOT checking!). So we (arbitrarily) decide this: | ||
72 | // let's allow underscores wherever we would have allowed | ||
73 | // hyphens, if they are enabled. This is a pretty good match | ||
74 | // for browser behavior, for example, a large number of browsers | ||
75 | // cannot handle foo_.example.com, but foo_bar.example.com is | ||
76 | // fairly well supported. | ||
77 | $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : ''; | ||
78 | |||
79 | // The productions describing this are: | ||
80 | $a = '[a-z]'; // alpha | ||
81 | $an = '[a-z0-9]'; // alphanum | ||
82 | $and = "[a-z0-9-$underscore]"; // alphanum | "-" | ||
83 | // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum | ||
84 | $domainlabel = "$an($and*$an)?"; | ||
85 | // toplabel = alpha | alpha *( alphanum | "-" ) alphanum | ||
86 | $toplabel = "$a($and*$an)?"; | ||
87 | // hostname = *( domainlabel "." ) toplabel [ "." ] | ||
88 | if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) { | ||
89 | return $string; | ||
90 | } | ||
91 | |||
92 | // If we have Net_IDNA2 support, we can support IRIs by | ||
93 | // punycoding them. (This is the most portable thing to do, | ||
94 | // since otherwise we have to assume browsers support | ||
95 | |||
96 | if ($config->get('Core.EnableIDNA')) { | ||
97 | $idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true)); | ||
98 | // we need to encode each period separately | ||
99 | $parts = explode('.', $string); | ||
100 | try { | ||
101 | $new_parts = array(); | ||
102 | foreach ($parts as $part) { | ||
103 | $encodable = false; | ||
104 | for ($i = 0, $c = strlen($part); $i < $c; $i++) { | ||
105 | if (ord($part[$i]) > 0x7a) { | ||
106 | $encodable = true; | ||
107 | break; | ||
108 | } | ||
109 | } | ||
110 | if (!$encodable) { | ||
111 | $new_parts[] = $part; | ||
112 | } else { | ||
113 | $new_parts[] = $idna->encode($part); | ||
114 | } | ||
115 | } | ||
116 | $string = implode('.', $new_parts); | ||
117 | if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) { | ||
118 | return $string; | ||
119 | } | ||
120 | } catch (Exception $e) { | ||
121 | // XXX error reporting | ||
122 | } | ||
123 | } | ||
124 | return false; | ||
125 | } | ||
126 | } | ||
127 | |||
128 | // vim: et sw=4 sts=4 | ||