65 lines
1.4 KiB
Elixir
65 lines
1.4 KiB
Elixir
defmodule LabelmakerWeb.LabelController do
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use LabelmakerWeb, :controller
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alias LabelmakerWeb.Constants
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@label_dir Path.join(:code.priv_dir(:labelmaker), "static/labels")
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File.mkdir_p!(@label_dir)
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def show(conn, params) do
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params =
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params
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|> Map.take(Constants.permitted_keys())
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|> Enum.filter(fn {k, v} ->
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case k do
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"color" -> v in Constants.colors()
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"font" -> v in Constants.fonts()
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"label" -> String.length(v) <= Constants.max_label_length()
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"size" -> v in Constants.sizes()
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_ -> true
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end
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end)
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|> Map.new()
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options =
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Constants.defaults()
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|> Map.merge(params)
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filename =
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options
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|> inspect()
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|> (fn str -> :crypto.hash(:sha256, str) end).()
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|> Base.encode16(case: :lower)
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filename = filename <> ".png"
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filepath = Path.join(@label_dir, filename)
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unless File.exists?(filepath) do
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generate_image(options, filepath)
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end
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conn
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|> put_resp_content_type("image/png")
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|> send_file(200, filepath)
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end
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defp generate_image(options, filepath) do
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args = [
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"-background",
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"none",
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"-fill",
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options["color"],
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"-pointsize",
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options["size"],
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"-font",
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options["font"],
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"label:#{options["label"]}",
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"-set",
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"comment",
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inspect(options),
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filepath
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]
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{_, 0} = System.cmd("magick", args)
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end
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end
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