]> sipb.mit.edu Git - ikiwiki.git/blobdiff - IkiWiki/Plugin/htmlscrubber.pm
export $safe_url_regexp
[ikiwiki.git] / IkiWiki / Plugin / htmlscrubber.pm
index 41cf6c991c868bb95c3a1bc74dbfbad4e3cf4368..8c37f1be618b612c68bab5350077d341668be4d6 100644 (file)
@@ -3,47 +3,87 @@ package IkiWiki::Plugin::htmlscrubber;
 
 use warnings;
 use strict;
 
 use warnings;
 use strict;
-use IkiWiki;
+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 { #{{{
 
 sub import { #{{{
-       IkiWiki::hook(type => "sanitize", id => "htmlscrubber",
-               call => \&sanitize);
+       hook(type => "sanitize", id => "htmlscrubber", call => \&sanitize);
+
+       # 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",
+               # Selected unofficial schemes
+               "aim", "callto", "cvs", "ed2k", "feed", "fish", "gg",
+               "irc", "ircs", "lastfm", "ldaps", "magnet", "mms",
+               "msnim", "notes", "rsync", "secondlife", "skype", "ssh",
+               "sftp", "sms", "steam", "webcal", "ymsgr",
+       );
+       # 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 ($) { #{{{
-       return scrubber()->scrub(shift);
+sub sanitize (@) { #{{{
+       my %params=@_;
+       return scrubber()->scrub($params{content});
 } # }}}
 
 my $_scrubber;
 sub scrubber { #{{{
        return $_scrubber if defined $_scrubber;
 } # }}}
 
 my $_scrubber;
 sub scrubber { #{{{
        return $_scrubber if defined $_scrubber;
-       
+
        eval q{use HTML::Scrubber};
        eval q{use HTML::Scrubber};
+       error($@) if $@;
        # Lists based on http://feedparser.org/docs/html-sanitization.html
        # Lists based on http://feedparser.org/docs/html-sanitization.html
+       # With html 5 video and audio tags added.
        $_scrubber = HTML::Scrubber->new(
                allow => [qw{
        $_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
                        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
                        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
+                               align alt axis border cellpadding cellspacing
+                               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 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 valign
+                               value vspace width
+                               autoplay loopstart loopend end
+                               playcount controls 
+                       } ),
+                       "/" => 1, # emit proper <hr /> XHTML
+                       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,
                }],
                }],
-               default => [undef, { map { $_ => 1 } qw{
-                       abbr accept accept-charset accesskey action
-                       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
-                       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
-                       tabindex target title type usemap valign
-                       value vspace width
-               }}],
        );
        return $_scrubber;
 } # }}}
        );
        return $_scrubber;
 } # }}}