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# frozen_string_literal: true
module Banzai
module Filter
# Sanitize HTML produced by Markdown.
#
# Extends Banzai::Filter::BaseSanitizationFilter with specific rules.
class SanitizationFilter < Banzai::Filter::BaseSanitizationFilter
# Styles used by Markdown for table alignment
TABLE_ALIGNMENT_PATTERN = /text-align: (?<alignment>center|left|right)/.freeze
def customize_allowlist(allowlist)
# Allow table alignment; we allow specific text-align values in a
# transformer below
allowlist[:attributes]['th'] = %w[style]
allowlist[:attributes]['td'] = %w[style]
allowlist[:css] = { properties: ['text-align'] }
# Allow the 'data-sourcepos' from CommonMark on all elements
allowlist[:attributes][:all].push('data-sourcepos')
# Remove any `style` properties not required for table alignment
allowlist[:transformers].push(self.class.remove_unsafe_table_style)
# Allow `id` in a and li elements for footnotes
# and remove any `id` properties not matching for footnotes
allowlist[:attributes]['a'].push('id')
allowlist[:attributes]['li'] = %w[id]
allowlist[:transformers].push(self.class.remove_non_footnote_ids)
if Feature.enabled?(:use_cmark_renderer, default_enabled: :yaml)
# Allow section elements with data-footnotes attribute
allowlist[:elements].push('section')
allowlist[:attributes]['section'] = %w(data-footnotes)
allowlist[:attributes]['a'].push('data-footnote-ref', 'data-footnote-backref')
end
allowlist
end
class << self
def remove_unsafe_table_style
lambda do |env|
node = env[:node]
return unless node.name == 'th' || node.name == 'td'
return unless node.has_attribute?('style')
if node['style'] =~ TABLE_ALIGNMENT_PATTERN
node['style'] = "text-align: #{$~[:alignment]}"
else
node.remove_attribute('style')
end
end
end
def remove_non_footnote_ids
lambda do |env|
node = env[:node]
return unless node.name == 'a' || node.name == 'li'
return unless node.has_attribute?('id')
if Feature.enabled?(:use_cmark_renderer, default_enabled: :yaml)
return if node.name == 'a' && node['id'] =~ Banzai::Filter::FootnoteFilter::FOOTNOTE_LINK_REFERENCE_PATTERN
return if node.name == 'li' && node['id'] =~ Banzai::Filter::FootnoteFilter::FOOTNOTE_LI_REFERENCE_PATTERN
else
return if node.name == 'a' && node['id'] =~ Banzai::Filter::FootnoteFilter::FOOTNOTE_LINK_REFERENCE_PATTERN_OLD
return if node.name == 'li' && node['id'] =~ Banzai::Filter::FootnoteFilter::FOOTNOTE_LI_REFERENCE_PATTERN_OLD
end
node.remove_attribute('id')
end
end
end
end
end
end
Banzai::Filter::SanitizationFilter.prepend_mod_with('Banzai::Filter::SanitizationFilter')
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