request.ex

defmodule Feed.S3.Request do
  alias ExAws.S3
  
  @bucket "<BUCKET NAME>"
  @post_regex ~r/posts\/.*.md/
  @tip_regex ~r/tips\/.*.md/
  
  def get_posts do
    @post_regex
    |> list_posts()
    |> parse_list()
  end
  
  def get_tips do
    @tip_regex
    |> list_tips()
    |> parse_list()
  end
  
  defp list_items(regex) do
    @bucket
    |> S3.list_objects()
    |> ExAws.request!()
    |> Map.get(:body)
    |> Map.get(:contents)
    |> Enum.filter(fn item ->
      String.match?(item.key, regex)
    end)
  end
  
  defp parse_list(files) do
    files
    |> Enum.map(fn file ->
      body =
        @bucket
        |> S3.get_object(file.key)
        |> ExAws.request!()
        |> Map.get(:body)
        
      %{
        body: body,
        filename: file.key
      }
    end)
  end
end