78 lines
4.3 KiB
Markdown
78 lines
4.3 KiB
Markdown
We should support SVG. In particular:
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* We could support rendering SVGs to PNGs when compiling the wiki. Not all browsers support SVG yet.
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* We could support editing SVGs via the web interface. SVG can contain unsafe content such as scripting, so we would need to whitelist safe markup.
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* I am interested in seeing [svg-edit](http://code.google.com/p/svg-edit/) integrated -- [[EricDrechsel]]
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--[[JoshTriplett]]
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[[wishlist]]
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I'm allowing for inline SVG on my own installation. I've patched my
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copy of htmlscrubber.pm to allow safe MathML and SVG elements (as
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implemented in html5lib). <del datetime="2008-03-20T23:04-05:00">Here's a patch
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if anyone else is interested.</del>
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<ins datetime="2008-03-20T23:05-05:00">Actually, that patch wasn't quite
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right. I'll post a new one when it's working properly.</ins> --[[JasonBlevins]]
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* * *
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I'd like to hear what people think about the following:
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1. Including whitelists of elements and attributes for SVG and MathML in
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htmlscrubber.
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2. Creating a whitelist of safe SVG (and maybe even HTML) style
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attributes such as `fill`, `stroke-width`, etc.
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This is how the [sanitizer][] in html5lib works. It shouldn't be too
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hard to translate the relevant parts to Perl.
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--[[JasonBlevins]], March 21, 2008 11:39 EDT
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[sanitizer]: http://code.google.com/p/html5lib/source/browse/trunk/ruby/lib/html5/sanitizer.rb
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* * *
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Another problem is that [HTML::Scrubber][] converts all tags to lowercase.
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Some SVG elements, such as viewBox, are mixed case. It seems that
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properly handling SVG might require moving to a different sanitizer.
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It seems that [HTML::Sanitizer][] has functions for sanitizing XHTML.
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Any thoughts? --[[JasonBlevins]], March 21, 2008 13:54 EDT
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[HTML::Scrubber]: http://search.cpan.org/~podmaster/HTML-Scrubber-0.08/Scrubber.pm
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[HTML::Sanitizer]: http://search.cpan.org/~nesting/HTML-Sanitizer-0.04/Sanitizer.pm
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I figured out a quick hack to make HTML::Scrubber case-sensitive by
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making the underlying HTML::Parser case-sensitive:
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$_scrubber->{_p}->case_sensitive(1);
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So now I've got a version of [htmlscrubber.pm][] ([diff][])
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which allows safe SVG and MathML elements and attributes (but no
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styles—do we need them?). I'd be thrilled to see this
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in the trunk if other people think it's useful.
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--[[JasonBlevins]], March 24, 2008 14:56 EDT
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[htmlscrubber.pm]:http://xbeta.org/gitweb/?p=xbeta/ikiwiki.git;a=blob;f=IkiWiki/Plugin/htmlscrubber.pm;h=3c0ddc8f25bd8cb863634a9d54b40e299e60f7df;hb=fe333c8e5b4a5f374a059596ee698dacd755182d
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[diff]: http://xbeta.org/gitweb/?p=xbeta/ikiwiki.git;a=blobdiff;f=IkiWiki/Plugin/htmlscrubber.pm;h=3c0ddc8f25bd8cb863634a9d54b40e299e60f7df;hp=3bdaccea119ec0e1b289a0da2f6d90e2219b8d66;hb=fe333c8e5b4a5f374a059596ee698dacd755182d;hpb=be0b4f603f918444b906e42825908ddac78b7073
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> Unfortuantly these links are broken. --[[Joey]]
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* * *
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Actually, there's a way to embed SVG into MarkDown sources using the [data: URI scheme][rfc2397], [like this](data:image/svg+xml;base64,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).
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Of course, this way to display an image one needs to click a link, but it may be considered a feature.
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— [[Ivan_Shmakov]], 2010-03-12Z.
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[rfc2397]: http://tools.ietf.org/html/rfc2397
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> You can do the same with img src actually.
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>
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> If svg markup allows unsafe elements (ie, javascript),
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> which it appears to,
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> then this is a security hole, and the htmlscrubber
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> needs to lock it down more. Darn, now I have to spend my afternoon making
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> security releases! --[[Joey]]
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