forked from treehouse/mastodon
132 lines
3.4 KiB
Ruby
132 lines
3.4 KiB
Ruby
# frozen_string_literal: true
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class AdvancedTextFormatter < TextFormatter
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class HTMLRenderer < Redcarpet::Render::HTML
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def initialize(options, &block)
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super(options)
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@format_link = block
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end
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def block_code(code, _language)
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<<~HTML
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<pre><code>#{ERB::Util.h(code).gsub("\n", '<br/>')}</code></pre>
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HTML
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end
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def autolink(link, link_type)
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return link if link_type == :email
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@format_link.call(link)
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end
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end
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# @param [String] text
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# @param [Hash] options
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# @option options [Boolean] :multiline
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# @option options [Boolean] :with_domains
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# @option options [Boolean] :with_rel_me
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# @option options [Array<Account>] :preloaded_accounts
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# @option options [String] :content_type
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def initialize(text, options = {})
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content_type = options.delete(:content_type)
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super(text, options)
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@text = format_markdown(text) if content_type == 'text/markdown'
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end
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# Differs from TextFormatter by not messing with newline after parsing
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def to_s
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return ''.html_safe if text.blank?
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html = rewrite do |entity|
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if entity[:url]
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link_to_url(entity)
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elsif entity[:hashtag]
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link_to_hashtag(entity)
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elsif entity[:screen_name]
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link_to_mention(entity)
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end
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end
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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# Differs from `TextFormatter` by skipping HTML tags and entities
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def entities
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@entities ||= begin
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gaps = []
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total_offset = 0
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escaped = text.gsub(/<[^>]*>|&#[0-9]+;/) do |match|
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total_offset += match.length - 1
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end_offset = Regexp.last_match.end(0)
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gaps << [end_offset - total_offset, total_offset]
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' '
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end
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Extractor.extract_entities_with_indices(escaped, extract_url_without_protocol: false).map do |entity|
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start_pos, end_pos = entity[:indices]
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offset_idx = gaps.rindex { |gap| gap.first <= start_pos }
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offset = offset_idx.nil? ? 0 : gaps[offset_idx].last
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entity.merge(indices: [start_pos + offset, end_pos + offset])
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end
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end
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end
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private
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# Differs from `TextFormatter` in that it keeps HTML; but it sanitizes at the end to remain safe
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def rewrite
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entities.sort_by! do |entity|
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entity[:indices].first
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end
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result = ''.dup
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last_index = entities.reduce(0) do |index, entity|
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indices = entity[:indices]
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result << text[index...indices.first]
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result << yield(entity)
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indices.last
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end
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result << text[last_index..-1]
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Sanitize.fragment(result, Sanitize::Config::MASTODON_OUTGOING)
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end
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def format_markdown(html)
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html = markdown_formatter.render(html)
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html.delete("\r").delete("\n")
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end
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def markdown_formatter
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extensions = {
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autolink: true,
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no_intra_emphasis: true,
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fenced_code_blocks: true,
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disable_indented_code_blocks: true,
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strikethrough: true,
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lax_spacing: true,
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space_after_headers: true,
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superscript: true,
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underline: true,
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highlight: true,
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footnotes: false,
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}
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renderer = HTMLRenderer.new({
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filter_html: false,
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escape_html: false,
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no_images: true,
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no_styles: true,
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safe_links_only: true,
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hard_wrap: true,
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link_attributes: { target: '_blank', rel: 'nofollow noopener' },
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}) do |url|
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link_to_url({ url: url })
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end
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Redcarpet::Markdown.new(renderer, extensions)
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end
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end
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