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