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80 lines
1.9 KiB
Ruby
80 lines
1.9 KiB
Ruby
class OembedController < ApplicationController
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CELL_WIDTH = 7.22
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CELL_HEIGHT = 16
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BORDER_WIDTH = 12
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def show
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url = URI.parse(params[:url])
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if url.path =~ %r{^/a/([^/]+)$}
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id = $1
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asciicast = AsciicastDecorator.new(Asciicast.find(id))
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respond_to do |format|
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format.json do
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render json: oembed_response(asciicast)
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end
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format.xml do
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render xml: oembed_response(asciicast).to_xml(root: 'oembed')
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end
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end
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else
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head :bad_request
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end
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rescue URI::InvalidURIError
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head :bad_request
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end
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private
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def oembed_response(asciicast)
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scale = 2 # pixel density
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image_width = scale * (CELL_WIDTH * asciicast.width + BORDER_WIDTH).floor
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image_height = scale * (CELL_HEIGHT * asciicast.height + BORDER_WIDTH)
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width, height = size_smaller_than(
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image_width,
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image_height,
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params[:maxwidth] || image_width,
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params[:maxheight] || image_height
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)
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{
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type: 'rich',
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version: 1.0,
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title: asciicast.title,
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author_name: asciicast.user.display_name,
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author_url: profile_url(asciicast.user),
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provider_name: 'asciinema',
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provider_url: root_url,
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thumbnail_url: asciicast_url(asciicast, format: :png),
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thumbnail_width: width,
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thumbnail_height: height,
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html: render_html(asciicast, width),
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width: width,
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height: height,
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}
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end
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def render_html(asciicast, width)
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render_to_string(
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template: 'oembed/show.html.erb',
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layout: false,
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locals: { asciicast: asciicast, width: width }
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).chomp
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end
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def size_smaller_than(width, height, max_width, max_height)
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fw = Rational(max_width, width)
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fh = Rational(max_height, height)
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if fw > 1 && fh > 1
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[width, height]
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else
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f = [fw, fh].min
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[(Rational(width) * f).to_i, (Rational(height) * f).to_i]
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end
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end
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end
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