Add the optimize filter for uploaded pics

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/upload/filter/optimize.ex

@@ -0,0 +1,41 @@
+defmodule MobilizonWeb.Upload.Filter.Optimize do
+  @moduledoc """
+  Handle picture optimizations
+  """
+
+  @behaviour MobilizonWeb.Upload.Filter
+
+  alias Mobilizon.Config
+
+  @default_optimizers [
+    JpegOptim,
+    PngQuant,
+    Optipng,
+    Svgo,
+    Gifsicle,
+    Cwebp
+  ]
+
+  def filter(%MobilizonWeb.Upload{tempfile: file, content_type: "image" <> _}) do
+    optimizers = Config.get([__MODULE__, :optimizers], @default_optimizers)
+
+    case ExOptimizer.optimize(file, deps: optimizers) do
+      {:ok, res} ->
+        :ok
+
+      {:error, err} ->
+        require Logger
+
+        Logger.warn(
+          "Unable to optimize file #{file}. The return from the process was #{inspect(err)}"
+        )
+
+        :ok
+
+      err ->
+        err
+    end
+  end
+
+  def filter(_), do: :ok
+end