discourse/plugins/lazy-yt/plugin.rb

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# frozen_string_literal: true
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# name: lazy-yt
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# about: Uses the lazyYT plugin to lazy load Youtube videos
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# version: 1.0.1
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# authors: Arpit Jalan
# url: https://github.com/discourse/discourse/tree/master/plugins/lazy-yt
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hide_plugin if self.respond_to?(:hide_plugin)
require "onebox"
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# javascript
register_asset "javascripts/lazyYT.js"
# stylesheet
register_asset "stylesheets/lazyYT.css"
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register_asset "stylesheets/lazyYT_mobile.scss", :mobile
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# freedom patch YouTube Onebox
class Onebox::Engine::YoutubeOnebox
include Onebox::Engine
alias_method :yt_onebox_to_html, :to_html
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def to_html
if video_id && !params['list']
size_restricted = [params['width'], params['height']].any?
video_width = (params['width'] && params['width'].to_i <= 695) ? params['width'] : 690 # embed width
video_height = (params['height'] && params['height'].to_i <= 500) ? params['height'] : 388 # embed height
size_tags = ["width=\"#{video_width}\"", "height=\"#{video_height}\""]
result = parse_embed_response
result ||= get_opengraph.data
thumbnail_url = result[:image] || "https://img.youtube.com/vi/#{video_id}/hqdefault.jpg"
# Put in the LazyYT div instead of the iframe
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escaped_title = ERB::Util.html_escape(video_title)
<<~EOF
<div class="onebox lazyYT lazyYT-container"
data-youtube-id="#{video_id}"
data-youtube-title="#{escaped_title}"
#{size_restricted ? size_tags.map { |t| "data-#{t}" }.join(' ') : ""}
data-parameters="#{embed_params}">
<a href="https://www.youtube.com/watch?v=#{video_id}" target="_blank">
<img class="ytp-thumbnail-image"
src="#{thumbnail_url}"
#{size_restricted ? size_tags.join(' ') : ""}
title="#{escaped_title}">
</a>
</div>
EOF
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else
yt_onebox_to_html
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end
end
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end
after_initialize do
on(:reduce_cooked) do |fragment|
fragment.css(".lazyYT").each do |yt|
begin
youtube_id = yt["data-youtube-id"]
parameters = yt["data-parameters"]
uri = URI("https://www.youtube.com/embed/#{youtube_id}?autoplay=1&#{parameters}")
yt.replace %{<p><a href="#{uri.to_s}">https://#{uri.host}#{uri.path}</a></p>}
rescue URI::InvalidURIError
# remove any invalid/weird URIs
yt.remove
end
end
end
end