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Mixer/lib/mixer/accounts/avatar_uploader.ex

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Elixir
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defmodule Mixer.Accounts.AvatarUploader do
use Waffle.Definition
@versions [:original, :thumb]
@extensions ~w(.jpg .jpeg .png .gif .webp)
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
# Resize to a 256×256 square (centre-crop) and convert to WebP for efficiency
def transform(:thumb, _) do
{:convert, "-strip -thumbnail 256x256^ -gravity center -extent 256x256 -format webp", :webp}
end
# Store both versions under avatars/:user_id/
def storage_dir(_version, {_file, scope}), do: "avatars/#{scope.user_id}"
def filename(:original, {file, _scope}) do
Path.basename(file.file_name, Path.extname(file.file_name))
end
def filename(:thumb, _), do: "thumb"
def s3_object_headers(:thumb, _), do: [content_type: "image/webp"]
def s3_object_headers(_version, {file, _scope}) do
[content_type: MIME.from_path(file.file_name)]
end
def acl(_version, _), do: :public_read
end