fileupload « todo « doc - ikiwiki-upstream - Unnamed repository; edit this file to name it for gitweb.

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# 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("|", map quotemeta,

# 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", "smb", "sms", "snews", "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 (@) { #{{{

    my %params=@_;

    return scrubber()->scrub($params{content});

} # }}}

my $_scrubber;

sub scrubber { #{{{

    return $_scrubber if defined $_scrubber;

    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 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 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

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,

}],

);

    return $_scrubber;

} # }}}