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# frozen_string_literal: true
require 'nokogiri'
module Gitlab
module Email
class HtmlToMarkdownParser < Html2Text
extend Gitlab::Utils::Override
# List of tags to be converted by Markdown.
#
# All attributes are removed except for the defined ones.
#
# <tag> => [<attribute to keep>, ...]
ALLOWED_TAG_ATTRIBUTES = {
'em' => [],
'strong' => [],
'details' => [],
'img' => %w[alt src]
}.freeze
private_constant :ALLOWED_TAG_ATTRIBUTES
# This redefinition can be removed once https://github.com/soundasleep/html2text_ruby/pull/30
# is merged and released.
def self.convert(html)
html = fix_newlines(replace_entities(html))
doc = Nokogiri::HTML(html)
new(doc).convert
end
private
override :iterate_over
def iterate_over(node)
allowed_attributes = ALLOWED_TAG_ATTRIBUTES[node.name]
return super unless allowed_attributes
remove_attributes(node, allowed_attributes)
Kramdown::Document.new(node.to_html, input: 'html').to_commonmark
end
def remove_attributes(node, allowed_attributes)
to_remove = (node.keys - allowed_attributes)
to_remove.each { |key| node.remove_attribute(key) }
end
end
end
end
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