# frozen_string_literal: true require 'singleton' require_relative './sanitize_config' 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 raw_content = status.text unless status.local? html = reformat(raw_content) html = encode_custom_emojis(html, status.emojis) if options[:custom_emojify] return html.html_safe # rubocop:disable Rails/OutputSafety end linkable_accounts = status.mentions.map(&:account) linkable_accounts << status.account html = raw_content html = "RT @#{prepend_reblog} #{html}" if prepend_reblog html = encode_and_link_urls(html, linkable_accounts) html = encode_custom_emojis(html, status.emojis) if options[:custom_emojify] html = simple_format(html, {}, sanitize: false) html = html.delete("\n") html.html_safe # rubocop:disable Rails/OutputSafety end def reformat(html) sanitize(html, Sanitize::Config::MASTODON_STRICT) end def plaintext(status) return status.text if status.local? text = status.text.gsub(/(<br \/>|<br>|<\/p>)+/) { |match| "#{match}\n" } strip_tags(text) end def simplified_format(account) return reformat(account.note).html_safe unless account.local? # rubocop:disable Rails/OutputSafety linkify(account.note) end def sanitize(html, config) Sanitize.fragment(html, config) end def format_spoiler(status) html = encode(status.spoiler_text) html = encode_custom_emojis(html, status.emojis) html.html_safe # rubocop:disable Rails/OutputSafety end def linkify(text) html = encode_and_link_urls(text) html = simple_format(html, {}, sanitize: false) html = html.delete("\n") html.html_safe # rubocop:disable Rails/OutputSafety end private def encode(html) HTMLEntities.new.encode(html) end def encode_and_link_urls(html, accounts = nil) entities = Extractor.extract_entities_with_indices(html, extract_url_without_protocol: false) rewrite(html.dup, entities) do |entity| if entity[:url] link_to_url(entity) 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) return html if emojis.empty? emoji_map = emojis.map { |e| [e.shortcode, full_asset_url(e.image.url(:static))] }.to_h 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 replacement = "<img draggable=\"false\" class=\"emojione\" alt=\":#{shortcode}:\" title=\":#{shortcode}:\" src=\"#{emoji}\" />" 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 == '<span class="invisible">' invisible_depth = 1 end elsif html[i] == '<' tag_open_index = i inside_shortname = false elsif !tag_open_index && html[i] == ':' inside_shortname = true shortname_start_index = i end end html end def rewrite(text, entities) chars = text.to_s.to_char_a # Sort by start index entities = entities.sort_by do |entity| indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices] indices.first end result = [] last_index = entities.reduce(0) do |index, entity| indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices] result << encode(chars[index...indices.first].join) result << yield(entity) indices.last end result << encode(chars[last_index..-1].join) result.flatten.join end def link_to_url(entity) normalized_url = Addressable::URI.parse(entity[:url]).normalize html_attrs = { target: '_blank', rel: 'nofollow noopener' } Twitter::Autolink.send(:link_to_text, entity, link_html(entity[:url]), normalized_url, html_attrs) rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError encode(entity[:url]) end def link_to_mention(entity, linkable_accounts) acct = entity[:screen_name] return link_to_account(acct) unless linkable_accounts account = linkable_accounts.find { |item| TagManager.instance.same_acct?(item.acct, acct) } account ? mention_html(account) : "@#{acct}" end def link_to_account(acct) username, domain = acct.split('@') domain = nil if TagManager.instance.local_domain?(domain) account = Account.find_remote(username, domain) account ? mention_html(account) : "@#{acct}" end def link_to_hashtag(entity) hashtag_html(entity[:hashtag]) end def link_html(url) url = Addressable::URI.parse(url).to_s prefix = url.match(/\Ahttps?:\/\/(www\.)?/).to_s text = url[prefix.length, 30] suffix = url[prefix.length + 30..-1] cutoff = url[prefix.length..-1].length > 30 "<span class=\"invisible\">#{encode(prefix)}</span><span class=\"#{cutoff ? 'ellipsis' : ''}\">#{encode(text)}</span><span class=\"invisible\">#{encode(suffix)}</span>" end def hashtag_html(tag) "<a href=\"#{tag_url(tag.downcase)}\" class=\"mention hashtag\" rel=\"tag\">#<span>#{tag}</span></a>" end def mention_html(account) "<span class=\"h-card\"><a href=\"#{TagManager.instance.url_for(account)}\" class=\"u-url mention\">@<span>#{account.username}</span></a></span>" end end