Working s3 compatible file uplaods!

lib/mixer/posts/media_uploader.ex

@@ -0,0 +1,24 @@
+defmodule Mixer.Posts.MediaUploader do
+  use Waffle.Definition
+
+  @async false
+  @versions [:original]
+  @extensions ~w(.jpg .jpeg .png .gif .webp .mp4 .mov)
+
+  def validate({file, _scope}) do
+    ext = file.file_name |> Path.extname() |> String.downcase()
+    if ext in @extensions, do: :ok, else: {:error, "unsupported file type #{ext}"}
+  end
+
+  def storage_dir(_version, {_file, scope}), do: "uploads/media/#{scope.id}"
+
+  def filename(_version, {file, _scope}) do
+    Path.basename(file.file_name, Path.extname(file.file_name))
+  end
+
+  def s3_object_headers(_version, {file, _scope}) do
+    [content_type: MIME.from_path(file.file_name)]
+  end
+
+  def acl(_version, _), do: :public_read
+end