36 lines
1.2 KiB
Ruby
36 lines
1.2 KiB
Ruby
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module Gitlab
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module Sanitizers
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module SVG
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def self.clean(data)
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Loofah.xml_document(data).scrub!(Scrubber.new).to_s
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end
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class Scrubber < Loofah::Scrubber
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# http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#embedding-custom-non-visible-data-with-the-data-*-attributes
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DATA_ATTR_PATTERN = /\Adata-(?!xml)[a-z_][\w.\u00E0-\u00F6\u00F8-\u017F\u01DD-\u02AF-]*\z/u
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def scrub(node)
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unless Whitelist::ALLOWED_ELEMENTS.include?(node.name)
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node.unlink
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else
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node.attributes.each do |attr_name, attr|
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valid_attributes = Whitelist::ALLOWED_ATTRIBUTES[node.name]
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unless valid_attributes && valid_attributes.include?(attr_name)
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if Whitelist::ALLOWED_DATA_ATTRIBUTES_IN_ELEMENTS.include?(node.name) &&
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attr_name.start_with?('data-')
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# Arbitrary data attributes are allowed. Verify that the attribute
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# is a valid data attribute.
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attr.unlink unless attr_name =~ DATA_ATTR_PATTERN
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else
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attr.unlink
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end
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end
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end
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end
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end
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end
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end
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end
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end
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