# frozen_string_literal: true module ActiveStorage class Previewer::PDFPreviewer < Previewer 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 def mutool_path ActiveStorage.paths[:mutool] || "mutool" end end end