Add uploader.ex

lib/nulla/uploader.ex

@@ -0,0 +1,25 @@
+defmodule Nulla.Uploader do
+  def upload(%Plug.Upload{path: temp_path, filename: original_name}) do
+    {:ok, binary} = File.read(temp_path)
+    hash = :crypto.hash(:sha1, binary) |> Base.encode16(case: :lower)
+    file_type = Path.extname(original_name)
+
+    segments =
+      hash
+      |> String.slice(0, 15)
+      |> String.codepoints()
+      |> Enum.chunk_every(3)
+      |> Enum.map(&Enum.join/1)
+
+    filename = String.slice(hash, 15..-1) <> file_type
+    relative_path = Path.join(segments) <> "/" <> filename
+
+    dest_path = Path.join(["priv/static/files", relative_path])
+
+    dest_path |> Path.dirname() |> File.mkdir_p!()
+
+    File.write!(dest_path, binary)
+
+    relative_path
+  end
+end