Locally all my images are 404 not found (haven’t tried this in production). This is a brand new implementation so I’m sure I got something mixed up along the way.

I’m using ex_aws to store images in production, but locally I am just using the filesystem. I use system configs to determine what gets uploaded where.

dev.exs:

config :app, App.Images.PostImages,
  provider: App.Storage.LocalProvider,
  root: Path.expand(Path.join(__DIR__, "../priv/static/images/posts")),
  url_prefix: "/pics"

LocalProvider:

  @doc """
  This is what fetches a URL of an uploaded image
  """
  @impl true
  def url(%{url_prefix: url_prefix}, key, _opts \\ []) do
    with :ok <- validate_key(key) do
      ok({:local, Path.join(url_prefix, key)})
    else
      res -> {:error, res}
    end
  end

endpoint.ex

 image_file_storage = Application.get_env(:app, App.Images.PostImages)

  if Keyword.fetch!(image_file_storage, :provider) == App.Storage.LocalProvider do
    plug Plug.Static,
      at: "/pics",
      from: Keyword.fetch!(image_file_storage, :root),
      gzip: false
  end

The url/3 function returns a url /pics/:image_key, which it does. And I can view the image if I navigate to ../priv/static/images/posts/:image_key but Phoenix is not finding localhost:4000/pics/:image_key. What am I missing? I’ve implemented this in other systems before, but this is the first time I’ve written all provider behaviours myself.