Initial implementation of image preview proxy. Media proxy tests refactoring.

lib/pleroma/helpers/mogrify_helper.ex

@@ -0,0 +1,25 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Helpers.MogrifyHelper do
+  @moduledoc """
+  Handles common Mogrify operations.
+  """
+
+  @spec store_as_temporary_file(String.t(), binary()) :: {:ok, String.t()} | {:error, atom()}
+  @doc "Stores binary content fetched from specified URL as a temporary file."
+  def store_as_temporary_file(url, body) do
+    path = Mogrify.temporary_path_for(%{path: url})
+    with :ok <- File.write(path, body), do: {:ok, path}
+  end
+
+  @spec store_as_temporary_file(String.t(), String.t()) :: Mogrify.Image.t() | any()
+  @doc "Modifies file at specified path by resizing to specified limit dimensions."
+  def in_place_resize_to_limit(path, resize_dimensions) do
+    path
+    |> Mogrify.open()
+    |> Mogrify.resize_to_limit(resize_dimensions)
+    |> Mogrify.save(in_place: true)
+  end
+end