HTMLPurifier_AttrDef_URI_Host Class Reference

Validates a host according to the IPv4, IPv6 and DNS (future) specifications. More...

Inheritance diagram for HTMLPurifier_AttrDef_URI_Host:

Collaboration diagram for HTMLPurifier_AttrDef_URI_Host:

Public Member Functions
	__construct ()
	validate ($string, $config, $context)
Public Member Functions inherited from HTMLPurifier_AttrDef
	parseCDATA ($string)
	Convenience method that parses a string as if it were CDATA.
	make ($string)
	Factory method for creating this class from a string.

Protected Attributes
	$ipv4
	IPv4 sub-validator.
	$ipv6
	IPv6 sub-validator.

Additional Inherited Members
Data Fields inherited from HTMLPurifier_AttrDef
	$minimized = false
	Tells us whether or not an HTML attribute is minimized.
	$required = false
	Tells us whether or not an HTML attribute is required.
Protected Member Functions inherited from HTMLPurifier_AttrDef
	mungeRgb ($string)
	Removes spaces from rgb(0, 0, 0) so that shorthand CSS properties work properly.
	expandCSSEscape ($string)
	Parses a possibly escaped CSS string and returns the "pure" version of it.

Detailed Description

Validates a host according to the IPv4, IPv6 and DNS (future) specifications.

Definition at line 6 of file Host.php.

Constructor & Destructor Documentation

HTMLPurifier_AttrDef_URI_Host::__construct

(

)

Definition at line 21 of file Host.php.

    {
        $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
        $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
    }

Member Function Documentation

HTMLPurifier_AttrDef_URI_Host::validate	(		$string,
			$config,
			$context
	)

Parameters

string	$string
HTMLPurifier_Config	$config
HTMLPurifier_Context	$context

Returns

bool|string

Reimplemented from HTMLPurifier_AttrDef.

Definition at line 33 of file Host.php.

References $ipv4, and $valid.

    {
        $length = strlen($string);
        // empty hostname is OK; it's usually semantically equivalent:
        // the default host as defined by a URI scheme is used:
        //
        //      If the URI scheme defines a default for host, then that
        //      default applies when the host subcomponent is undefined
        //      or when the registered name is empty (zero length).
        if ($string === '') {
            return '';
        }
        if ($length > 1 && $string[0] === '[' && $string[$length - 1] === ']') {
            //IPv6
            $ip = substr($string, 1, $length - 2);
            $valid = $this->ipv6->validate($ip, $config, $context);
            if ($valid === false) {
                return false;
            }
            return '[' . $valid . ']';
        }

        // need to do checks on unusual encodings too
        $ipv4 = $this->ipv4->validate($string, $config, $context);
        if ($ipv4 !== false) {
            return $ipv4;
        }

        // A regular domain name.

        // This doesn't match I18N domain names, but we don't have proper IRI support,
        // so force users to insert Punycode.

        // There is not a good sense in which underscores should be
        // allowed, since it's technically not! (And if you go as
        // far to allow everything as specified by the DNS spec...
        // well, that's literally everything, modulo some space limits
        // for the components and the overall name (which, by the way,
        // we are NOT checking!).  So we (arbitrarily) decide this:
        // let's allow underscores wherever we would have allowed
        // hyphens, if they are enabled.  This is a pretty good match
        // for browser behavior, for example, a large number of browsers
        // cannot handle foo_.example.com, but foo_bar.example.com is
        // fairly well supported.
        $underscore = $config->get('Core.AllowHostnameUnderscore') ? '_' : '';

        // The productions describing this are:
        $a   = '[a-z]';     // alpha
        $an  = '[a-z0-9]';  // alphanum
        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
        $domainlabel = "$an($and*$an)?";
        // toplabel    = alpha | alpha *( alphanum | "-" ) alphanum
        $toplabel = "$a($and*$an)?";
        // hostname    = *( domainlabel "." ) toplabel [ "." ]
        if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
            return $string;
        }

        // If we have Net_IDNA2 support, we can support IRIs by
        // punycoding them. (This is the most portable thing to do,
        // since otherwise we have to assume browsers support

        if ($config->get('Core.EnableIDNA')) {
            $idna = new Net_IDNA2(array('encoding' => 'utf8', 'overlong' => false, 'strict' => true));
            // we need to encode each period separately
            $parts = explode('.', $string);
            try {
                $new_parts = array();
                foreach ($parts as $part) {
                    $encodable = false;
                    for ($i = 0, $c = strlen($part); $i < $c; $i++) {
                        if (ord($part[$i]) > 0x7a) {
                            $encodable = true;
                            break;
                        }
                    }
                    if (!$encodable) {
                        $new_parts[] = $part;
                    } else {
                        $new_parts[] = $idna->encode($part);
                    }
                }
                $string = implode('.', $new_parts);
                if (preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string)) {
                    return $string;
                }
            } catch (Exception $e) {
                // XXX error reporting
            }
        }
        return false;
    }

Field Documentation

HTMLPurifier_AttrDef_URI_Host::$ipv4

protected

IPv4 sub-validator.

HTMLPurifier_AttrDef_URI_IPv4

Definition at line 13 of file Host.php.

Referenced by validate().

HTMLPurifier_AttrDef_URI_Host::$ipv6

protected

IPv6 sub-validator.

HTMLPurifier_AttrDef_URI_IPv6

Definition at line 19 of file Host.php.

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The documentation for this class was generated from the following file:

• Services/Html/HtmlPurifier/library/HTMLPurifier/AttrDef/URI/Host.php