discourse/lib/onebox/sanitize_config.rb

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# frozen_string_literal: true
module Onebox
module SanitizeConfig
HTTP_PROTOCOLS ||= ['http', 'https', :relative].freeze
ONEBOX ||= Sanitize::Config.freeze_config(Sanitize::Config.merge(Sanitize::Config::RELAXED,
elements: Sanitize::Config::RELAXED[:elements] + %w[audio details embed iframe source video svg path],
attributes: {
'a' => Sanitize::Config::RELAXED[:attributes]['a'] + %w(target),
'audio' => %w[controls controlslist],
'embed' => %w[height src type width],
'iframe' => %w[allowfullscreen frameborder height scrolling src width data-original-href data-unsanitized-src],
'source' => %w[src type],
'video' => %w[controls height loop width autoplay muted poster controlslist playsinline],
'path' => %w[d fill-rule],
'svg' => ['aria-hidden', 'width', 'height', 'viewbox'],
'div' => [:data], # any data-* attributes,
'span' => [:data], # any data-* attributes
},
add_attributes: {
'iframe' => {
'seamless' => 'seamless',
'sandbox' => 'allow-same-origin allow-scripts allow-forms allow-popups allow-popups-to-escape-sandbox' \
' allow-presentation',
}
},
transformers: (Sanitize::Config::RELAXED[:transformers] || []) + [
lambda do |env|
next unless env[:node_name] == 'a'
a_tag = env[:node]
a_tag['href'] ||= '#'
if a_tag['href'] =~ %r{^(?:[a-z]+:)?//}
a_tag['rel'] = 'nofollow ugc noopener'
else
a_tag.remove_attribute('target')
end
end,
lambda do |env|
next unless env[:node_name] == 'iframe'
iframe = env[:node]
allowed_regexes = env[:config][:allowed_iframe_regexes] || [/.*/]
allowed = allowed_regexes.any? { |r| iframe["src"] =~ r }
if !allowed
# add a data attribute with the blocked src. This is not required
# but makes it much easier to troubleshoot onebox issues
iframe["data-unsanitized-src"] = iframe["src"]
iframe.remove_attribute("src")
end
end
],
protocols: {
'embed' => { 'src' => HTTP_PROTOCOLS },
'iframe' => { 'src' => HTTP_PROTOCOLS },
'source' => { 'src' => HTTP_PROTOCOLS },
},
css: {
properties: Sanitize::Config::RELAXED[:css][:properties] + %w[--aspect-ratio]
}
))
DISCOURSE_ONEBOX ||=
Sanitize::Config.freeze_config(
Sanitize::Config.merge(
ONEBOX,
attributes: Sanitize::Config.merge(
ONEBOX[:attributes],
'aside' => [:data]
)
)
)
end
end