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# 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
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