b1349342d2
- Disallow links with relative paths - Disallow iframes with non-http protocols and relative paths Close #13037
118 lines
2.8 KiB
Ruby
118 lines
2.8 KiB
Ruby
# 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
|
|
).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_HREF_TRANSFORMER = lambda do |env|
|
|
return unless env[:node_name] == 'a'
|
|
|
|
current_node = env[:node]
|
|
|
|
scheme = begin
|
|
if current_node['href'] =~ Sanitize::REGEX_PROTOCOL
|
|
Regexp.last_match(1).downcase
|
|
else
|
|
:relative
|
|
end
|
|
end
|
|
|
|
current_node.replace(current_node.text) unless LINK_PROTOCOLS.include?(scheme)
|
|
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])
|
|
|
|
current_node = env[:node]
|
|
|
|
case env[:node_name]
|
|
when 'li'
|
|
current_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
|
|
current_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: {},
|
|
|
|
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
|