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New directive %Core.AllowHostnameUnderscore

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Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
This commit is contained in:
Edward Z. Yang
2013-07-26 21:33:39 -07:00
parent af7107e830
commit 53c2907706
6 changed files with 47 additions and 4 deletions
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15
library/HTMLPurifier/AttrDef/URI/Host.php
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@@ -47,10 +47,23 @@ class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
// 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-]'; // alphanum | "-"
$and = "[a-z0-9-$underscore]"; // alphanum | "-"
// domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
$domainlabel = "$an($and*$an)?";
// toplabel = alpha | alpha *( alphanum | "-" ) alphanum