]> sipb.mit.edu Git - ikiwiki.git/blobdiff - IkiWiki/Plugin/htmlscrubber.pm
export $safe_url_regexp
[ikiwiki.git] / IkiWiki / Plugin / htmlscrubber.pm
index 25caa8a506cdf5ab8ea0c9b0d3e9e935f62bd6f8..8c37f1be618b612c68bab5350077d341668be4d6 100644 (file)
@@ -5,19 +5,13 @@ use warnings;
 use strict;
 use IkiWiki 2.00;
 
+# This regexp matches urls that are in a known safe scheme.
+# Feel free to use it from other plugins.
+our $safe_url_regexp;
+
 sub import { #{{{
        hook(type => "sanitize", id => "htmlscrubber", call => \&sanitize);
-} # }}}
-
-sub sanitize (@) { #{{{
-       my %params=@_;
-       return scrubber()->scrub($params{content});
-} # }}}
 
-my $_scrubber;
-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
@@ -29,16 +23,25 @@ sub scrubber { #{{{
                "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",
+               "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;
+       # data is a special case. Allow data:image/*, but
+       # disallow data:text/javascript and everything else.
+       $safe_url_regexp=qr/^(?:(?:$uri_schemes):|data:image\/|[^:]+$)/i;
+} # }}}
+
+sub sanitize (@) { #{{{
+       my %params=@_;
+       return scrubber()->scrub($params{content});
+} # }}}
+
+my $_scrubber;
+sub scrubber { #{{{
+       return $_scrubber if defined $_scrubber;
 
        eval q{use HTML::Scrubber};
        error($@) if $@;
@@ -59,24 +62,27 @@ sub scrubber { #{{{
                        map { $_ => 1 } qw{
                                abbr accept accept-charset accesskey
                                align alt axis border cellpadding cellspacing
-                               char charoff charset checked cite class
+                               char charoff charset checked class
                                clear cols colspan color compact coords
                                datetime dir disabled enctype for frame
                                headers height hreflang hspace id ismap
-                               label lang longdesc maxlength media method
+                               label lang maxlength media method
                                multiple name nohref noshade nowrap prompt
                                readonly rel rev rows rowspan rules scope
                                selected shape size span start summary
-                               tabindex target title type usemap valign
+                               tabindex target title type valign
                                value vspace width
                                autoplay loopstart loopend end
                                playcount controls 
                        } ),
                        "/" => 1, # emit proper <hr /> XHTML
-                       href => $link,
-                       src => $link,
-                       action => $link,
-                       poster => $link,
+                       href => $safe_url_regexp,
+                       src => $safe_url_regexp,
+                       action => $safe_url_regexp,
+                       cite => $safe_url_regexp,
+                       longdesc => $safe_url_regexp,
+                       poster => $safe_url_regexp,
+                       usemap => $safe_url_regexp,
                }],
        );
        return $_scrubber;