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module Banzai
module Filter
# Find every image that isn't already wrapped in an `a` tag, and that has
# a `src` attribute ending with a video extension, add a new video node and
# a "Download" link in the case the video cannot be played.
class VideoLinkFilter < HTML::Pipeline::Filter
def call
doc.xpath(query).each do |el|
el.replace(video_node(doc, el))
end
doc
end
private
def query
@query ||= begin
src_query = UploaderHelper::VIDEO_EXT.map do |ext|
"'.#{ext}' = substring(@src, string-length(@src) - #{ext.size})"
end
"descendant-or-self::img[not(ancestor::a) and (#{src_query.join(' or ')})]"
end
end
def video_node(doc, element)
container = doc.document.create_element(
'div',
class: 'video-container'
)
video = doc.document.create_element(
'video',
src: element['src'],
width: '400',
controls: true,
'data-setup' => '{}',
'data-title' => element['title'] || element['alt'])
link = doc.document.create_element(
'a',
element['title'] || element['alt'],
href: element['src'],
target: '_blank',
rel: 'noopener noreferrer',
title: "Download '#{element['title'] || element['alt']}'")
download_paragraph = doc.document.create_element('p')
download_paragraph.children = link
container.add_child(video)
container.add_child(download_paragraph)
container
end
end
end
end
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