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https://github.com/ezyang/htmlpurifier.git
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5b14310284
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@208 48356398-32a2-884e-a903-53898d9a118a
103 lines
4.0 KiB
PHP
103 lines
4.0 KiB
PHP
<?php
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require_once 'HTMLPurifier/URIScheme.php';
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require_once 'HTMLPurifier/URISchemeRegistry.php';
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class HTMLPurifier_AttrDef_URI extends HTMLPurifier_AttrDef
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{
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function validate($uri, $config = null) {
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// We'll write stack-based parsers later, for now, use regexps to
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// get things working as fast as possible (irony)
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// parse as CDATA
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$uri = $this->parseCDATA($uri);
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// while it would be nice to use parse_url(), that's specifically
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// for HTTP and thus won't work for our generic URI parsing
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// define regexps
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$HEXDIG = '[A-Fa-f0-9]';
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$unreserved = 'A-Za-z0-9-._~'; // make sure you wrap with []
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$sub_delims = '!$&\'()'; // needs []
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$pct_encoded = "%$HEXDIG$HEXDIG";
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$h16 = "{$HEXDIG}{1,4}";
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$dec_octet = '(?:25[0-5]|2[0-4]\d|1\d\d|1\d|[0-9])';
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$IPv4address = "$dec_octet.$dec_octet.$dec_octet.$dec_octet";
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$ls32 = "(?:$h16:$h16|$IPv4address)";
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$IPvFuture = "v$HEXDIG+\.[:$unreserved$sub_delims]+";
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$IPv6Address = "(?:".
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"(?:$h16:){6}$ls32" .
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"|::(?:$h16:){5}$ls32" .
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"|(?:$h16)?::(?:$h16:){4}$ls32" .
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"|(?:(?:$h16:){1}$h16)?::(?:$h16:){3}$ls32" .
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"|(?:(?:$h16:){2}$h16)?::(?:$h16:){2}$ls32" .
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"|(?:(?:$h16:){3}$h16)?::(?:$h16:){1}$ls32" .
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"|(?:(?:$h16:){4}$h16)?::$ls32" .
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"|(?:(?:$h16:){5}$h16)?::$h16" .
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"|(?:(?:$h16:){6}$h16)?::" .
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")";
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$IP_literal = "\[(?:$IPvFuture|$IPv6Address)\]";
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// the important regexps, the collide with other names, prefix with r_
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$r_userinfo = "(?:[$unreserved$sub_delims:]|$pct_encoded)*";
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$r_authority = "/^(($r_userinfo)@)?(\[$IP_literal\]|[^:]*)(:(\d*))?/";
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// according to the RFC... (but this cuts corners, i.e. non-validating)
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$r_URI = '!^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?!';
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// 12 3 4 5 6 7 8 9
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$matches = array();
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$result = preg_match($r_URI, $uri, $matches);
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if (!$result) return ''; // wow, that's very strange
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// seperate out parts
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$scheme = !empty($matches[1]) ? $matches[2] : null;
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$authority = !empty($matches[3]) ? $matches[4] : null;
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$path = $matches[5]; // always present
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$query = !empty($matches[6]) ? $matches[7] : null;
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$fragment = !empty($matches[8]) ? $matches[9] : null;
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// okay, no need to validate the scheme since we do that when we
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// retrieve the specific scheme object from the registry
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$scheme = ctype_lower($scheme) ? $scheme : strtolower($scheme);
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$registry = HTMLPurifier_URISchemeRegistry::instance();
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$scheme_obj = $registry->getScheme($scheme);
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if (!$scheme_obj) return ''; // invalid scheme, clean it out
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if ($authority !== null) {
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// validate authority
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$matches = array();
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// IPv6 is broken
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preg_match($r_authority, $authority, $matches);
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$userinfo = !empty($matches[1]) ? $matches[2] : null;
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$host = !empty($matches[3]) ? $matches[3] : null;
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$port = !empty($matches[4]) ? $matches[5] : null;
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// validate port
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if ($port !== null) {
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if (!ctype_digit($port) || $port < 1 || $port > 65535) {
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$port = null;
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}
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}
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$authority =
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($userinfo === null ? '' : ($userinfo . '@')) .
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$host .
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($port === null ? '' : (':' . $port));
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}
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list($authority, $path, $query, $fragment) =
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$scheme_obj->validateComponents($authority, $path, $query, $fragment);
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}
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}
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?>
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