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