Add filter for HEIF (.heic) files to convert them to JPEGs

lib/pleroma/upload/filter/heif.ex

@@ -0,0 +1,41 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Upload.Filter.Heif do
+  @behaviour Pleroma.Upload.Filter
+  alias Pleroma.Upload
+
+  require Logger
+
+  @type conversion :: action :: String.t() | {action :: String.t(), opts :: String.t()}
+  @type conversions :: conversion() | [conversion()]
+
+  @spec filter(Pleroma.Upload.t()) :: {:ok, :atom} | {:error, String.t()}
+  def filter(
+        %Pleroma.Upload{name: name, path: path, tempfile: tempfile, content_type: "image/heic"} =
+          upload
+      ) do
+    try do
+      name = name |> String.replace_suffix(".heic", ".jpg")
+      path = path |> String.replace_suffix(".heic", ".jpg")
+      convert(tempfile)
+
+      {:ok, :filtered, %Upload{upload | name: name, path: path, content_type: "image/jpeg"}}
+    rescue
+      e in ErlangError ->
+        {:error, "mogrify command not found: #{inspect(e)}"}
+    end
+  end
+
+  def filter(_), do: {:ok, :noop}
+
+  def convert(tempfile) do
+    tempfile
+    |> Mogrify.open()
+    |> Mogrify.format("jpeg")
+    |> Mogrify.save(in_place: true)
+    |> Mogrify.verbose()
+    |> IO.inspect
+  end
+end