--amend

lib/azure_storage/azure_file_share.ex

@@ -219,15 +219,21 @@ defmodule AzureStorage.FileShare do
   @spec get_file(Context.t(), String.t(), String.t(), String.t()) ::
           {:ok, binary(), map()} | {:error, String.t()}
   def get_file(%Context{service: "file"} = context, share, directory, filename) do
-    path =
-      [share, directory, filename]
-      |> Enum.reject(&(&1 in [nil, ""]))
-      |> Path.join()
+    cond do
+      is_nil(share) or share == "" ->
+        {:error, "missing_share"}
 
-    context
-    |> build(method: :get, path: path)
-    |> request(response_body: :full)
-    |> parse_body_headers_response()
+      is_nil(filename) or filename == "" ->
+        {:error, "missing_filename"}
+
+      true ->
+        path = Path.join([share, directory || "", filename])
+
+        context
+        |> build(method: :get, path: path)
+        |> request(response_body: :full)
+        |> parse_body_headers_response()
+    end
   end
 
   # helpers