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module Gitlab
module Sanitizers
module SVG
def self.clean(data)
Loofah.xml_document(data).scrub!(Scrubber.new).to_s
end
class Scrubber < Loofah::Scrubber
# http://www.whatwg.org/specs/web-apps/current-work/multipage/elements.html#embedding-custom-non-visible-data-with-the-data-*-attributes
DATA_ATTR_PATTERN = /\Adata-(?!xml)[a-z_][\w.\u00E0-\u00F6\u00F8-\u017F\u01DD-\u02AF-]*\z/u
def scrub(node)
if Whitelist::ALLOWED_ELEMENTS.include?(node.name)
valid_attributes = Whitelist::ALLOWED_ATTRIBUTES[node.name]
return unless valid_attributes
node.attribute_nodes.each do |attr|
attr_name = attribute_name_with_namespace(attr)
if valid_attributes.include?(attr_name)
# xlink:href is on the whitelist but we should deny any reference other than internal ids
if attr_name == 'xlink:href' && unsafe_href?(attr)
attr.unlink
end
else
if Whitelist::ALLOWED_DATA_ATTRIBUTES_IN_ELEMENTS.include?(node.name) && data_attribute?(attr)
# Arbitrary data attributes are allowed. Verify that the attribute
# is a valid data attribute.
attr.unlink unless attr_name =~ DATA_ATTR_PATTERN
else
attr.unlink
end
end
end
else
node.unlink
end
end
def attribute_name_with_namespace(attr)
if attr.namespace
"#{attr.namespace.prefix}:#{attr.name}"
else
attr.name
end
end
def unsafe_href?(attr)
!attr.value.start_with?('#')
end
def data_attribute?(attr)
attr.name.start_with?('data-')
end
end
end
end
end
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