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