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# frozen_string_literal: true
module Banzai
module Filter
# HTML filter that "fixes" links to pages/files in a wiki.
# Rewrite rules are documented in the `WikiPipeline` spec.
#
# Context options:
# :wiki
class WikiLinkFilter < HTML::Pipeline::Filter
include Gitlab::Utils::SanitizeNodeLink
CSS_A = 'a:not(.gfm)'
XPATH_A = Gitlab::Utils::Nokogiri.css_to_xpath(CSS_A).freeze
CSS_VA = 'video, audio'
XPATH_VA = Gitlab::Utils::Nokogiri.css_to_xpath(CSS_VA).freeze
CSS_IMG = 'img'
XPATH_IMG = Gitlab::Utils::Nokogiri.css_to_xpath(CSS_IMG).freeze
def call
return doc unless wiki?
doc.xpath(XPATH_A).each { |el| process_link(el.attribute('href'), el) }
doc.xpath(XPATH_VA).each { |el| process_link(el.attribute('src'), el) }
doc.xpath(XPATH_IMG).each do |el|
attr = el.attribute('data-src') || el.attribute('src')
process_link(attr, el)
end
doc
end
protected
def process_link(link_attr, node)
process_link_attr(link_attr)
remove_unsafe_links({ node: node }, remove_invalid_links: false)
end
def wiki?
!context[:wiki].nil?
end
def process_link_attr(html_attr)
return if html_attr.blank?
html_attr.value = apply_rewrite_rules(html_attr.value)
rescue URI::Error, Addressable::URI::InvalidURIError
# noop
end
def apply_rewrite_rules(link_string)
Rewriter.new(link_string, wiki: context[:wiki], slug: context[:page_slug]).apply_rules
end
end
end
end
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