# frozen_string_literal: true require 'singleton' require_relative './sanitize_config' class HTMLRenderer < Redcarpet::Render::HTML def block_code(code, language) "
#{encode(code).gsub("\n", "
")}
" end def autolink(link, link_type) return link if link_type == :email Formatter.instance.link_url(link) end private def html_entities @html_entities ||= HTMLEntities.new end def encode(html) html_entities.encode(html) end end # rubocop:disable Metrics/ClassLength class Formatter include Singleton include RoutingHelper include ActionView::Helpers::TextHelper def format(status, **options) if status.reblog? prepend_reblog = status.reblog.account.acct status = status.proper else prepend_reblog = false end summary = nil raw_content = status.text summary_mode = false if status.title.present? summary = status.spoiler_text.presence || status.text summary_mode = !options[:article_content] raw_content = summary_mode ? summary : status.text end if options[:inline_poll_options] && status.preloadable_poll raw_content = raw_content + "\n\n" + status.preloadable_poll.options.map { |title| "[ ] #{title}" }.join("\n") end return '' if raw_content.blank? return format_remote_content(raw_content, status.emojis, summary: summary, **options) unless status.local? html = raw_content html = "RT @#{prepend_reblog} #{html}" if prepend_reblog html = "📄 #{html}" if summary_mode return html if options[:plaintext] linkable_accounts = status.mentions.map(&:account) linkable_accounts << status.account keep_html = !summary_mode && %w(text/markdown text/html).include?(status.content_type) html = format_markdown(html) if !summary_mode && status.content_type == 'text/markdown' html = encode_and_link_urls(html, linkable_accounts, keep_html: keep_html) html = reformat(html, true) if keep_html html = encode_custom_emojis(html, status.emojis, options[:autoplay]) if options[:custom_emojify] unless keep_html html = simple_format(html, {}, sanitize: false) html.delete!("\n") end html = summary_mode ? format_article_summary(html, status) : format_article_content(summary, html) if summary.present? html = format_footer(html, status.footer, linkable_accounts, status.emojis, **options) if status.footer.present? html.html_safe # rubocop:disable Rails/OutputSafety end def format_remote_content(html, emojis, **options) html = reformat(html, options[:outgoing]) html = encode_custom_emojis(html, emojis, options[:autoplay]) if options[:custom_emojify] html = format_article_content(options[:summary], html) if options[:article_content] && options[:summary].present? html.html_safe # rubocop:disable Rails/OutputSafety end def format_footer(html, footer, linkable_accounts, emojis, **options) footer = encode_and_link_urls(footer, linkable_accounts) footer = encode_custom_emojis(footer, emojis, options[:autoplay]) if options[:custom_emojify] footer = "#{footer}" footer = simple_format(footer, { 'data-name': 'footer' }, sanitize: false) footer.delete!("\n") "#{html}#{footer}" end def format_markdown(html) html = markdown_formatter.render(html) html.delete("\r").delete("\n") end def format_article(text) text = text.gsub(/>[\r\n]+<') text.html_safe # rubocop:disable Rails/OutputSafety end def format_article_summary(html, status) status_url = ActivityPub::TagManager.instance.url_for(status) "#{html}\n

#{link_url(status_url)}

" end def format_article_content(summary, html) "
#{format_summary(summary, html)}
#{html}" end def reformat(html, outgoing = false) sanitize(html, Sanitize::Config::MASTODON_STRICT.merge(outgoing: outgoing)) rescue ArgumentError '' end def plaintext(status) return status.text if status.local? text = status.text.gsub(/(
|
|<\/p>)+/) { |match| "#{match}\n" } strip_tags(text) end def simplified_format(account, **options) return reformat(account.note) unless account.local? html = format_markdown(account.note) html = encode_and_link_urls(html, keep_html: true) html = reformat(html, true) html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify] html.html_safe # rubocop:disable Rails/OutputSafety end def sanitize(html, config) Sanitize.fragment(html, config) end def format_summary(summary, fallback) summary&.strip.presence || fallback[/(?:

.*?<\/p>)/im].presence || '🗎❓' end def format_spoiler(status, **options) html = encode(status.title.presence || status.spoiler_text) html = encode_custom_emojis(html, status.emojis, options[:autoplay]) html.html_safe # rubocop:disable Rails/OutputSafety end def format_poll_option(status, option, **options) html = encode(option.title) html = encode_custom_emojis(html, status.emojis, options[:autoplay]) html.html_safe # rubocop:disable Rails/OutputSafety end def format_display_name(account, **options) html = encode(account.display_name.presence || account.username) html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify] html.html_safe # rubocop:disable Rails/OutputSafety end def format_field(account, str, **options) html = account.local? ? encode_and_link_urls(str, me: true) : reformat(str) html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify] html.html_safe # rubocop:disable Rails/OutputSafety end def linkify(text, accounts = nil, options = {}) html = encode_and_link_urls(text, accounts, options) html = simple_format(html, {}, sanitize: false) html = html.delete("\n") html.html_safe # rubocop:disable Rails/OutputSafety end def link_url(url) "#{link_html(url)}" end private def markdown_formatter extensions = { autolink: true, no_intra_emphasis: true, fenced_code_blocks: true, disable_indented_code_blocks: true, strikethrough: true, lax_spacing: true, space_after_headers: true, superscript: true, underline: true, highlight: true, footnotes: false, } renderer = HTMLRenderer.new({ filter_html: false, escape_html: false, no_images: false, no_styles: true, safe_links_only: true, hard_wrap: true, link_attributes: { target: '_blank', rel: 'nofollow noopener' }, }) Redcarpet::Markdown.new(renderer, extensions) end def html_entities @html_entities ||= HTMLEntities.new end def encode(html) html_entities.encode(html) end def encode_and_link_urls(html, accounts = nil, options = {}) if accounts.is_a?(Hash) options = accounts accounts = nil end entities = options[:keep_html] ? html_friendly_extractor(html) : utf8_friendly_extractor(html, extract_url_without_protocol: false) rewrite(html.dup, entities, options[:keep_html]) do |entity| if entity[:url] link_to_url(entity, options) elsif entity[:hashtag] link_to_hashtag(entity) elsif entity[:screen_name] link_to_mention(entity, accounts) end end end def count_tag_nesting(tag) if tag[1] == '/' then -1 elsif tag[-2] == '/' then 0 else 1 end end def encode_custom_emojis(html, emojis, animate = false) return html if emojis.empty? emoji_map = emojis.each_with_object({}) { |e, h| h[e.shortcode] = [full_asset_url(e.image.url), full_asset_url(e.image.url(:static))] } i = -1 tag_open_index = nil inside_shortname = false shortname_start_index = -1 invisible_depth = 0 while i + 1 < html.size i += 1 if invisible_depth.zero? && inside_shortname && html[i] == ':' shortcode = html[shortname_start_index + 1..i - 1] emoji = emoji_map[shortcode] if emoji original_url, static_url = emoji replacement = begin if animate "\":#{encode(shortcode)}:\"" else "\":#{encode(shortcode)}:\"" end end before_html = shortname_start_index.positive? ? html[0..shortname_start_index - 1] : '' html = before_html + replacement + html[i + 1..-1] i += replacement.size - (shortcode.size + 2) - 1 else i -= 1 end inside_shortname = false elsif tag_open_index && html[i] == '>' tag = html[tag_open_index..i] tag_open_index = nil if invisible_depth.positive? invisible_depth += count_tag_nesting(tag) elsif tag == '