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# frozen_string_literal: true
class Sanitize
module Config
HTTP_PROTOCOLS ||= ['http', 'https', 'dat', 'dweb', 'ipfs', 'ipns', 'ssb', 'gopher', :relative].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 e =~ /^(h|p|u|dt|e)-/ # microformats classes
next true if e =~ /^(mention|hashtag)$/ # semantic classes
next true if e =~ /^(ellipsis|invisible)$/ # link formatting classes
end
node['class'] = class_list.join(' ')
end
UNSUPPORTED_ELEMENTS_TRANSFORMER = lambda do |env|
return unless %w(h1 h2 h3 h4 h5 h6 blockquote pre ul ol li).include?(env[:node_name])
case env[:node_name]
when 'li'
env[:node].traverse do |node|
next unless %w(p ul ol li).include?(node.name)
node.add_next_sibling('<br>') if node.next_sibling
node.replace(node.children) unless node.text?
end
else
env[:node].name = 'p'
end
end
MASTODON_STRICT ||= freeze_config(
elements: %w(p br span a),
attributes: {
'a' => %w(href rel class),
'span' => %w(class),
},
add_attributes: {
'a' => {
'rel' => 'nofollow noopener noreferrer',
'target' => '_blank',
},
},
protocols: {
'a' => { 'href' => HTTP_PROTOCOLS },
},
transformers: [
CLASS_WHITELIST_TRANSFORMER,
UNSUPPORTED_ELEMENTS_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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