sanitize_css(style)
public
Sanitizes a block of css code. Used by #sanitize when it comes across a
style attribute
# File actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb, line 107
def sanitize_css(style)
# disallow urls
style = style.to_s.gsub(/url\s*\(\s*[^\s)]+?\s*\)\s*/, ' ')
# gauntlet
if style !~ /^([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*$/ ||
style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$)\s*)*$/
return ''
end
clean = []
style.scan(/([-\w]+)\s*:\s*([^:;]*)/) do |prop,val|
if allowed_css_properties.include?(prop.downcase)
clean << prop + ': ' + val + ';'
elsif shorthand_css_properties.include?(prop.split('-')[0].downcase)
unless val.split().any? do |keyword|
!allowed_css_keywords.include?(keyword) &&
keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
end
clean << prop + ': ' + val + ';'
end
end
end
clean.join(' ')
end
