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module Banzai
module Filter
# HTML Filter to modify the attributes of external links
class ExternalLinkFilter < HTML::Pipeline::Filter
SCHEMES = ['http', 'https', nil].freeze
def call
links.each do |node|
uri = uri(node['href'].to_s)
next unless uri
node.set_attribute('href', uri.to_s)
if SCHEMES.include?(uri.scheme) && external_url?(uri)
node.set_attribute('rel', 'nofollow noreferrer noopener')
node.set_attribute('target', '_blank')
end
end
doc
end
private
def uri(href)
URI.parse(href)
rescue URI::Error
nil
end
def links
query = 'descendant-or-self::a[@href and not(@href = "")]'
doc.xpath(query)
end
def external_url?(uri)
# Relative URLs miss a hostname
return false unless uri.hostname
uri.hostname != internal_url.hostname
end
def internal_url
@internal_url ||= URI.parse(Gitlab.config.gitlab.url)
end
end
end
end
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