sub scrubber { #{{{
return $_scrubber if defined $_scrubber;
+ # Only known uri schemes are allowed to avoid all the ways of
+ # embedding javascrpt.
+ # List at http://en.wikipedia.org/wiki/URI_scheme
+ my $uri_schemes=join("|",
+ # IANA registered schemes
+ "http", "https", "ftp", "mailto", "file", "telnet", "gopher",
+ "aaa", "aaas", "acap", "cap", "cid", "crid",
+ "dav", "dict", "dns", "fax", "go", "h323", "im", "imap",
+ "ldap", "mid", "news", "nfs", "nntp", "pop", "pres",
+ "sip", "sips", "snmp", "tel", "urn", "wais", "xmpp",
+ "z39.50r", "z39.50s",
+ # data is a special case. Allow data:text/<image>, but
+ # disallow data:text/javascript and everything else.
+ qr/data:text\/(?:png|gif|jpeg)/,
+ # Selected unofficial schemes
+ "about", "aim", "callto", "cvs", "ed2k", "feed", "fish", "gg",
+ "irc", "ircs", "lastfm", "ldaps", "magnet", "mms",
+ "msnim", "notes", "rsync", "secondlife", "skype", "ssh",
+ "sftp", "sms", "steam", "webcal", "ymsgr",
+ );
+ my $link=qr/^(?:$uri_schemes:|[^:]+$)/i;
+
eval q{use HTML::Scrubber};
error($@) if $@;
# Lists based on http://feedparser.org/docs/html-sanitization.html
+ # With html 5 video and audio tags added.
$_scrubber = HTML::Scrubber->new(
allow => [qw{
- a abbr acronym address area b big blockquote br
+ a abbr acronym address area b big blockquote br br/
button caption center cite code col colgroup dd del
dfn dir div dl dt em fieldset font form h1 h2 h3 h4
- h5 h6 hr i img input ins kbd label legend li map
- menu ol optgroup option p pre q s samp select small
+ h5 h6 hr hr/ i img input ins kbd label legend li map
+ menu ol optgroup option p p/ pre q s samp select small
span strike strong sub sup table tbody td textarea
tfoot th thead tr tt u ul var
+ video audio
}],
default => [undef, { (
map { $_ => 1 } qw{
- abbr accept accept-charset accesskey action
+ abbr accept accept-charset accesskey
align alt axis border cellpadding cellspacing
char charoff charset checked cite class
clear cols colspan color compact coords
datetime dir disabled enctype for frame
- headers height href hreflang hspace id ismap
+ headers height hreflang hspace id ismap
label lang longdesc maxlength media method
multiple name nohref noshade nowrap prompt
readonly rel rev rows rowspan rules scope
- selected shape size span src start summary
+ selected shape size span start summary
tabindex target title type usemap valign
value vspace width
+ autoplay loopstart loopend end
+ playcount controls
} ),
"/" => 1, # emit proper <hr /> XHTML
- "style" => qr{^[-a-zA-Z0-9]+$}, # only very simple
- # references allowed,
- # to avoid javascript
- }],
+ href => $link,
+ src => $link,
+ action => $link,
+ poster => $link,
+ }],
);
return $_scrubber;
} # }}}