392 lines
12 KiB
Ruby
392 lines
12 KiB
Ruby
# frozen_string_literal: true
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require 'singleton'
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require_relative './sanitize_config'
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class HTMLRenderer < Redcarpet::Render::HTML
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def block_code(code, language)
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"<pre><code>#{encode(code).gsub("\n", "<br/>")}</code></pre>"
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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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Formatter.instance.link_url(link)
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end
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private
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def html_entities
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@html_entities ||= HTMLEntities.new
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end
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def encode(html)
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html_entities.encode(html)
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end
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end
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class Formatter
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include Singleton
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include RoutingHelper
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include ActionView::Helpers::TextHelper
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def format(status, **options)
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if status.reblog?
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prepend_reblog = status.reblog.account.acct
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status = status.proper
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else
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prepend_reblog = false
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end
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raw_content = status.text
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if options[:inline_poll_options] && status.preloadable_poll
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raw_content = raw_content + "\n\n" + status.preloadable_poll.options.map { |title| "[ ] #{title}" }.join("\n")
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end
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return '' if raw_content.blank?
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unless status.local?
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html = reformat(raw_content)
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html = encode_custom_emojis(html, status.emojis, options[:autoplay]) if options[:custom_emojify]
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return html.html_safe # rubocop:disable Rails/OutputSafety
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end
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linkable_accounts = status.active_mentions.map(&:account)
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linkable_accounts << status.account
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html = raw_content
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html = "RT @#{prepend_reblog} #{html}" if prepend_reblog
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html = format_markdown(html) if status.content_type == 'text/markdown'
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html = encode_and_link_urls(html, linkable_accounts, keep_html: %w(text/markdown text/html).include?(status.content_type))
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html = reformat(html, true) if %w(text/markdown text/html).include?(status.content_type)
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html = encode_custom_emojis(html, status.emojis, options[:autoplay]) if options[:custom_emojify]
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unless %w(text/markdown text/html).include?(status.content_type)
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html = simple_format(html, {}, sanitize: false)
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html = html.delete("\n")
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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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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 reformat(html, outgoing = false)
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sanitize(html, Sanitize::Config::MASTODON_STRICT.merge(outgoing: outgoing))
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rescue ArgumentError
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''
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end
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def plaintext(status)
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return status.text if status.local?
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text = status.text.gsub(/(<br \/>|<br>|<\/p>)+/) { |match| "#{match}\n" }
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strip_tags(text)
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end
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def simplified_format(account, **options)
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html = account.local? ? linkify(account.note) : reformat(account.note)
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html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify]
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def sanitize(html, config)
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Sanitize.fragment(html, config)
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end
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def format_spoiler(status, **options)
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html = encode(status.spoiler_text)
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html = encode_custom_emojis(html, status.emojis, options[:autoplay])
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def format_poll_option(status, option, **options)
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html = encode(option.title)
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html = encode_custom_emojis(html, status.emojis, options[:autoplay])
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def format_display_name(account, **options)
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html = encode(account.display_name.presence || account.username)
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html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify]
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def format_field(account, str, **options)
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html = account.local? ? encode_and_link_urls(str, me: true) : reformat(str)
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html = encode_custom_emojis(html, account.emojis, options[:autoplay]) if options[:custom_emojify]
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def linkify(text)
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html = encode_and_link_urls(text)
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html = simple_format(html, {}, sanitize: false)
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html = html.delete("\n")
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html.html_safe # rubocop:disable Rails/OutputSafety
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end
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def link_url(url)
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"<a href=\"#{encode(url)}\" target=\"blank\" rel=\"nofollow noopener noreferrer\">#{link_html(url)}</a>"
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end
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private
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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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})
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Redcarpet::Markdown.new(renderer, extensions)
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end
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def html_entities
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@html_entities ||= HTMLEntities.new
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end
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def encode(html)
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html_entities.encode(html)
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end
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def encode_and_link_urls(html, accounts = nil, options = {})
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if accounts.is_a?(Hash)
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options = accounts
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accounts = nil
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end
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entities = options[:keep_html] ? html_friendly_extractor(html) : utf8_friendly_extractor(html, extract_url_without_protocol: false)
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rewrite(html.dup, entities, options[:keep_html]) do |entity|
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if entity[:url]
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link_to_url(entity, options)
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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, accounts)
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end
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end
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end
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def count_tag_nesting(tag)
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if tag[1] == '/' then -1
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elsif tag[-2] == '/' then 0
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else 1
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end
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end
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def encode_custom_emojis(html, emojis, animate = false)
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return html if emojis.empty?
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emoji_map = emojis.each_with_object({}) { |e, h| h[e.shortcode] = [full_asset_url(e.image.url), full_asset_url(e.image.url(:static))] }
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i = -1
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tag_open_index = nil
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inside_shortname = false
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shortname_start_index = -1
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invisible_depth = 0
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while i + 1 < html.size
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i += 1
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if invisible_depth.zero? && inside_shortname && html[i] == ':'
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shortcode = html[shortname_start_index + 1..i - 1]
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emoji = emoji_map[shortcode]
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if emoji
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original_url, static_url = emoji
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replacement = begin
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if animate
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"<img draggable=\"false\" class=\"emojione\" alt=\":#{encode(shortcode)}:\" title=\":#{encode(shortcode)}:\" src=\"#{encode(original_url)}\" />"
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else
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"<img draggable=\"false\" class=\"emojione custom-emoji\" alt=\":#{encode(shortcode)}:\" title=\":#{encode(shortcode)}:\" src=\"#{encode(static_url)}\" data-original=\"#{original_url}\" data-static=\"#{static_url}\" />"
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end
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end
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before_html = shortname_start_index.positive? ? html[0..shortname_start_index - 1] : ''
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html = before_html + replacement + html[i + 1..-1]
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i += replacement.size - (shortcode.size + 2) - 1
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else
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i -= 1
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end
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inside_shortname = false
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elsif tag_open_index && html[i] == '>'
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tag = html[tag_open_index..i]
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tag_open_index = nil
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if invisible_depth.positive?
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invisible_depth += count_tag_nesting(tag)
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elsif tag == '<span class="invisible">'
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invisible_depth = 1
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end
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elsif html[i] == '<'
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tag_open_index = i
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inside_shortname = false
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elsif !tag_open_index && html[i] == ':'
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inside_shortname = true
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shortname_start_index = i
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end
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end
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html
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end
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def rewrite(text, entities, keep_html = false)
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text = text.to_s
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# Sort by start index
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entities = entities.sort_by do |entity|
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indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices]
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indices.first
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end
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result = []
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last_index = entities.reduce(0) do |index, entity|
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indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices]
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result << (keep_html ? text[index...indices.first] : encode(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 << (keep_html ? text[last_index..-1] : encode(text[last_index..-1]))
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result.flatten.join
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end
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UNICODE_ESCAPE_BLACKLIST_RE = /\p{Z}|\p{P}/
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def utf8_friendly_extractor(text, options = {})
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old_to_new_index = [0]
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escaped = text.chars.map do |c|
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output = begin
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if c.ord.to_s(16).length > 2 && UNICODE_ESCAPE_BLACKLIST_RE.match(c).nil?
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CGI.escape(c)
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else
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c
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end
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end
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old_to_new_index << old_to_new_index.last + output.length
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output
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end.join
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# Note: I couldn't obtain list_slug with @user/list-name format
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# for mention so this requires additional check
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special = Extractor.extract_urls_with_indices(escaped, options).map do |extract|
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new_indices = [
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old_to_new_index.find_index(extract[:indices].first),
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old_to_new_index.find_index(extract[:indices].last),
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]
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next extract.merge(
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indices: new_indices,
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url: text[new_indices.first..new_indices.last - 1]
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)
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end
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standard = Extractor.extract_entities_with_indices(text, options)
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extra = Extractor.extract_extra_uris_with_indices(text, options)
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Extractor.remove_overlapping_entities(special + standard + extra)
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end
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def html_friendly_extractor(html, options = {})
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gaps = []
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total_offset = 0
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escaped = html.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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"\u200b"
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end
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entities = Extractor.extract_hashtags_with_indices(escaped, :check_url_overlap => false) +
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Extractor.extract_mentions_or_lists_with_indices(escaped)
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Extractor.remove_overlapping_entities(entities).map do |extract|
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pos = extract[:indices].first
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offset_idx = gaps.rindex { |gap| gap.first <= pos }
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offset = offset_idx.nil? ? 0 : gaps[offset_idx].last
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next extract.merge(
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:indices => [extract[:indices].first + offset, extract[:indices].last + offset]
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)
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end
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end
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def link_to_url(entity, options = {})
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url = Addressable::URI.parse(entity[:url])
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html_attrs = { target: '_blank', rel: 'nofollow noopener noreferrer' }
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html_attrs[:rel] = "me #{html_attrs[:rel]}" if options[:me]
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Twitter::Autolink.send(:link_to_text, entity, link_html(entity[:url]), url, html_attrs)
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rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
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encode(entity[:url])
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end
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def link_to_mention(entity, linkable_accounts)
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acct = entity[:screen_name]
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return link_to_account(acct) unless linkable_accounts
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account = linkable_accounts.find { |item| TagManager.instance.same_acct?(item.acct, acct) }
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account ? mention_html(account) : "@#{encode(acct)}"
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end
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def link_to_account(acct)
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username, domain = acct.split('@')
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domain = nil if TagManager.instance.local_domain?(domain)
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account = EntityCache.instance.mention(username, domain)
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account ? mention_html(account) : "@#{encode(acct)}"
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end
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def link_to_hashtag(entity)
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hashtag_html(entity[:hashtag])
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end
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def link_html(url)
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url = Addressable::URI.parse(url).to_s
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prefix = url.match(/\A(https?:\/\/(www\.)?|xmpp:)/).to_s
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text = url[prefix.length, 30]
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suffix = url[prefix.length + 30..-1]
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cutoff = url[prefix.length..-1].length > 30
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"<span class=\"invisible\">#{encode(prefix)}</span><span class=\"#{cutoff ? 'ellipsis' : ''}\">#{encode(text)}</span><span class=\"invisible\">#{encode(suffix)}</span>"
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end
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def hashtag_html(tag)
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"<a href=\"#{encode(tag_url(tag))}\" class=\"mention hashtag\" rel=\"tag\">#<span>#{encode(tag)}</span></a>"
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end
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def mention_html(account)
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"<span class=\"h-card\"><a href=\"#{encode(ActivityPub::TagManager.instance.url_for(account))}\" class=\"u-url mention\">@<span>#{encode(account.username)}</span></a></span>"
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end
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end
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