# frozen_string_literal: true class Sanitize module Config HTTP_PROTOCOLS = %w( http https ).freeze LINK_PROTOCOLS = %w( http https dat dweb ipfs ipns ssb gopher xmpp magnet gemini ).freeze CLASS_WHITELIST_TRANSFORMER = lambda do |env| node = env[:node] class_list = node['class']&.split(/[\t\n\f\r ]/) return unless class_list class_list.keep_if do |e| next true if /^(h|p|u|dt|e)-/.match?(e) # microformats classes next true if /^(mention|hashtag)$/.match?(e) # semantic classes next true if /^(ellipsis|invisible)$/.match?(e) # link formatting classes end node['class'] = class_list.join(' ') end UNSUPPORTED_HREF_TRANSFORMER = lambda do |env| return unless env[:node_name] == 'a' current_node = env[:node] scheme = if current_node['href'] =~ Sanitize::REGEX_PROTOCOL Regexp.last_match(1).downcase else :relative end current_node.replace(Nokogiri::XML::Text.new(current_node.text, current_node.document)) unless LINK_PROTOCOLS.include?(scheme) end UNSUPPORTED_ELEMENTS_TRANSFORMER = lambda do |env| return unless %w(h1 h2 h3 h4 h5 h6).include?(env[:node_name]) current_node = env[:node] current_node.name = 'strong' current_node.wrap('<p></p>') end MASTODON_STRICT ||= freeze_config( elements: %w(p br span a del pre blockquote code b strong u i em ul ol li), attributes: { 'a' => %w(href rel class), 'span' => %w(class), 'ol' => %w(start reversed), 'li' => %w(value), }, add_attributes: { 'a' => { 'rel' => 'nofollow noopener noreferrer', 'target' => '_blank', }, }, protocols: {}, transformers: [ CLASS_WHITELIST_TRANSFORMER, UNSUPPORTED_ELEMENTS_TRANSFORMER, UNSUPPORTED_HREF_TRANSFORMER, ] ) MASTODON_OEMBED ||= freeze_config merge( RELAXED, elements: RELAXED[:elements] + %w(audio embed iframe source video), attributes: merge( RELAXED[:attributes], 'audio' => %w(controls), 'embed' => %w(height src type width), 'iframe' => %w(allowfullscreen frameborder height scrolling src width), 'source' => %w(src type), 'video' => %w(controls height loop width), 'div' => [:data] ), protocols: merge( RELAXED[:protocols], 'embed' => { 'src' => HTTP_PROTOCOLS }, 'iframe' => { 'src' => HTTP_PROTOCOLS }, 'source' => { 'src' => HTTP_PROTOCOLS } ) ) end end