140 lines
3.5 KiB
Ruby
140 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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class Sanitize
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module Config
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HTTP_PROTOCOLS = %w(
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http
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https
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).freeze
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LINK_PROTOCOLS = %w(
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http
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https
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dat
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dweb
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ipfs
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ipns
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ssb
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gopher
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xmpp
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magnet
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gemini
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).freeze
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CLASS_WHITELIST_TRANSFORMER = lambda do |env|
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node = env[:node]
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class_list = node['class']&.split(/[\t\n\f\r ]/)
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return unless class_list
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class_list.keep_if do |e|
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next true if e =~ /^(h|p|u|dt|e)-/ # microformats classes
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next true if e =~ /^(mention|hashtag)$/ # semantic classes
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next true if e =~ /^(ellipsis|invisible)$/ # link formatting classes
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end
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node['class'] = class_list.join(' ')
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end
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IMG_TAG_TRANSFORMER = lambda do |env|
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node = env[:node]
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return unless env[:node_name] == 'img'
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node.name = 'a'
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node['href'] = node['src']
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if node['alt'].present?
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node.content = "[🖼 #{node['alt']}]"
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else
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url = node['href']
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prefix = url.match(/\Ahttps?:\/\/(www\.)?/).to_s
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text = url[prefix.length, 30]
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text = text + "…" if url[prefix.length..-1].length > 30
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node.content = "[🖼 #{text}]"
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end
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end
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LINK_REL_TRANSFORMER = lambda do |env|
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return unless env[:node_name] == 'a' and env[:node]['href']
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node = env[:node]
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rel = (node['rel'] || '').split(' ') & ['tag']
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unless env[:config][:outgoing] && TagManager.instance.local_url?(node['href'])
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rel += ['nofollow', 'noopener', 'noreferrer']
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end
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node['rel'] = rel.join(' ')
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end
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UNSUPPORTED_HREF_TRANSFORMER = lambda do |env|
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return unless env[:node_name] == 'a'
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current_node = env[:node]
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scheme = begin
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if current_node['href'] =~ Sanitize::REGEX_PROTOCOL
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Regexp.last_match(1).downcase
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else
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:relative
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end
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end
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current_node.replace(current_node.text) unless LINK_PROTOCOLS.include?(scheme)
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end
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MASTODON_STRICT ||= freeze_config(
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elements: %w(p br span a abbr del pre blockquote code b strong u sub sup i em h1 h2 h3 h4 h5 ul ol li),
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attributes: {
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'a' => %w(href rel class title),
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'span' => %w(class),
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'abbr' => %w(title),
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'blockquote' => %w(cite),
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'ol' => %w(start reversed),
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'li' => %w(value),
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},
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add_attributes: {
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'a' => {
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'target' => '_blank',
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},
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},
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protocols: {
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'a' => { 'href' => LINK_PROTOCOLS },
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'blockquote' => { 'cite' => LINK_PROTOCOLS },
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},
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transformers: [
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CLASS_WHITELIST_TRANSFORMER,
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IMG_TAG_TRANSFORMER,
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UNSUPPORTED_HREF_TRANSFORMER,
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LINK_REL_TRANSFORMER,
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]
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)
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MASTODON_OEMBED ||= freeze_config merge(
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RELAXED,
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elements: RELAXED[:elements] + %w(audio embed iframe source video),
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attributes: merge(
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RELAXED[:attributes],
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'audio' => %w(controls),
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'embed' => %w(height src type width),
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'iframe' => %w(allowfullscreen frameborder height scrolling src width),
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'source' => %w(src type),
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'video' => %w(controls height loop width),
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'div' => [:data]
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),
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protocols: merge(
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RELAXED[:protocols],
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'embed' => { 'src' => HTTP_PROTOCOLS },
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'iframe' => { 'src' => HTTP_PROTOCOLS },
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'source' => { 'src' => HTTP_PROTOCOLS }
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)
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)
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end
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end
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