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rails--rails/activestorage/lib/active_storage/previewer/pdf_previewer.rb
2017-12-01 11:07:30 -05:00

24 lines
618 B
Ruby

# frozen_string_literal: true
module ActiveStorage
class Previewer::PDFPreviewer < Previewer
class_attribute :mutool_path, default: "mutool"
def self.accept?(blob)
blob.content_type == "application/pdf"
end
def preview
download_blob_to_tempfile do |input|
draw_first_page_from input do |output|
yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png"
end
end
end
private
def draw_first_page_from(file, &block)
draw mutool_path, "draw", "-F", "png", "-o", "-", file.path, "1", &block
end
end
end