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December 21, 2015 09:49
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Sanitizing HTML content in a Rails model.
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class Foo < ActiveRecord::Base | |
ALLOWED_HTML_ELEMENTS = %w[ | |
a b br blockquote code em h2 h3 hr i li ol p pre s strong sub sup u ul | |
] | |
ALLOWED_EMPTY_HTML_ELEMENTS = %w[br hr] | |
before_validation :sanitize_html | |
private | |
def sanitize_html | |
unwanted_nodes = Loofah::Scrubber.new do |node| | |
name = node.name.downcase | |
node.remove unless (ALLOWED_HTML_ELEMENTS + ['text']).include?(name) | |
node.remove if (node.blank? || node.content.blank?) && !ALLOWED_EMPTY_HTML_ELEMENTS.include?(name) | |
end | |
frag = Loofah.fragment(self.content). | |
scrub!(:nofollow). | |
scrub!(unwanted_nodes). | |
scrub!(unwanted_nodes) # two-pass for catching empty elements after removing bad elements | |
self.content = frag.to_html.squish.strip | |
end | |
end |
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