100 lines
2.2 KiB
Ruby
100 lines
2.2 KiB
Ruby
require "sinatra"
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require "mini_magick"
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require "digest"
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require "fileutils"
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require "tempfile"
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MiniMagick.logger.level = Logger::DEBUG
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ROOT = ENV.fetch("ROOT")
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KEY = ENV.fetch("KEY")
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DITHER = ENV["DITHER"] != "0"
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FORMAT = "png"
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CACHE_DIR = ENV["DITHER_CACHE_DIR"]
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def cache_path_for(path, geometry)
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return unless CACHE_DIR
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source_path = "#{ROOT}/#{path}.enc"
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cache_key = Digest::SHA256.hexdigest([
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path,
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Digest::SHA256.file(source_path).hexdigest,
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geometry,
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DITHER,
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FORMAT,
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1
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].join("\0"))
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FileUtils.mkdir_p(CACHE_DIR)
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File.join(CACHE_DIR, "#{cache_key}.#{FORMAT}")
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end
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get "/*" do |path|
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halt 404, {"Content-Type" => "text/plain"}, "not found" unless File.exist?("#{ROOT}/#{path}.enc")
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content_type "image/#{FORMAT}"
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geometry = params["geo"] unless params["geo"] == ""
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geometry.gsub!(/\d+/) { |n| n.to_i * 2 } if geometry && !DITHER
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cached_path = cache_path_for(path, geometry)
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if cached_path && File.exist?(cached_path)
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return File.binread(cached_path)
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end
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decrypted = Tempfile.new(["dither", File.extname(path)])
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decrypted.binmode
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decrypted.close
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begin
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openssl_ok = system(
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"openssl",
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"aes-256-cbc",
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"-d",
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"-in", "#{ROOT}/#{path}.enc",
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"-out", decrypted.path,
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"-pass", "file:#{KEY}",
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"-iter", "1000000"
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)
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halt 500, {"Content-Type" => "text/plain"}, "decrypt failed" unless openssl_ok
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convert = MiniMagick::Tool::Convert.new
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convert.limit("memory", "128MiB")
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convert.limit("map", "256MiB")
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convert.limit("disk", "1GiB")
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convert << decrypted.path
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convert.background("white")
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convert.layers("flatten")
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convert.strip
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convert.auto_orient
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if geometry
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if geometry.match?(/^\d+x\d+$/)
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convert.resize "#{geometry}^"
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convert.gravity "center"
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convert.extent geometry
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else
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convert.resize geometry
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end
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end
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if DITHER
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convert.ordered_dither "o8x8"
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convert.monochrome
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end
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convert << "#{FORMAT.upcase}:-"
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output = convert.call
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if cached_path
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temp_cache_path = "#{cached_path}.tmp-#{Process.pid}"
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File.binwrite(temp_cache_path, output)
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FileUtils.mv(temp_cache_path, cached_path)
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end
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output
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ensure
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decrypted.unlink
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end
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end
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