49 lines
1.1 KiB
Ruby
49 lines
1.1 KiB
Ruby
module Banzai
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module Filter
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# HTML Filter to modify the attributes of external links
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class ExternalLinkFilter < HTML::Pipeline::Filter
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def call
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links.each do |node|
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href = href_to_lowercase_scheme(node["href"].to_s)
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unless node["href"].to_s == href
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node.set_attribute('href', href)
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end
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if href =~ %r{\A(https?:)?//[^/]} && external_url?(href)
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node.set_attribute('rel', 'nofollow noreferrer')
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node.set_attribute('target', '_blank')
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end
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end
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doc
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end
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private
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def links
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query = 'descendant-or-self::a[@href and not(@href = "")]'
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doc.xpath(query)
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end
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def href_to_lowercase_scheme(href)
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scheme_match = href.match(/\A(\w+):\/\//)
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if scheme_match
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scheme_match.to_s.downcase + scheme_match.post_match
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else
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href
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end
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end
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def external_url?(url)
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!url.start_with?(internal_url)
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end
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def internal_url
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@internal_url ||= Gitlab.config.gitlab.url
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end
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end
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end
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end
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