54 lines
1.9 KiB
Ruby
54 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/image.js
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module Banzai
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module Filter
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# HTML filter that wraps links around inline images.
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class ImageLinkFilter < HTML::Pipeline::Filter
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# Find every image that isn't already wrapped in an `a` tag, create
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# a new node (a link to the image source), copy the image as a child
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# of the anchor, and then replace the img with the link-wrapped version.
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#
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# If `link_replaces_image` context parameter is provided, the image is going
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# to be replaced with a link to an image.
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def call
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doc.xpath('descendant-or-self::img[not(ancestor::a)]').each do |img|
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link_replaces_image = !!context[:link_replaces_image]
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html_class = link_replaces_image ? 'with-attachment-icon' : 'no-attachment-icon'
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link = doc.document.create_element(
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'a',
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class: html_class,
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href: img['data-src'] || img['src'],
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target: '_blank',
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rel: 'noopener noreferrer'
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)
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# make sure the original non-proxied src carries over to the link
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link['data-canonical-src'] = img['data-canonical-src'] if img['data-canonical-src']
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if img['data-diagram'] && img['data-diagram-src']
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link['data-diagram'] = img['data-diagram']
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link['data-diagram-src'] = img['data-diagram-src']
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img.remove_attribute('data-diagram')
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img.remove_attribute('data-diagram-src')
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end
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link.children = link_replaces_image ? link_children(img) : img.clone
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img.replace(link)
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end
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doc
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end
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private
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def link_children(img)
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[img['alt'], img['data-src'], img['src']]
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.map { |f| Sanitize.fragment(f).presence }.compact.first || ''
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end
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end
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end
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end
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