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