Store last fm information into session (doesn't work yet)

lib/last_fm/api.ex

@@ -1,7 +1,7 @@
 defmodule LastFm.API do
   require Logger
 
-  alias LastFm.{Artist, Track}
+  alias LastFm.{Artist, Session, Track}
 
   defmodule ErrorResponse do
     defstruct [:error, :message]
@@ -71,6 +71,7 @@ defmodule LastFm.API do
     |> new_request()
     |> Req.merge(url: "/", params: params)
     |> Req.Request.append_response_steps(parse_error: &parse_error/1)
+    |> Req.Request.append_response_steps(parse_session: &parse_session/1)
     |> get_request()
   end
 
@@ -181,6 +182,11 @@ defmodule LastFm.API do
     request
   end
 
+  defp parse_session({request, response}) do
+    session = Session.parse(response.body)
+    {request, Map.put(response, :body, session)}
+  end
+
   defp parse_error({request, response}) do
     case response.body do
       %{"error" => error_number, "message" => message} ->

lib/music_library_web/controllers/last_fm_controller.ex

@@ -1,7 +1,19 @@
 defmodule MusicLibraryWeb.LastFmController do
   use MusicLibraryWeb, :controller
 
-  def callback(conn, %{"token" => _token}) do
-    conn |> redirect(to: ~p"/")
+  def callback(conn, %{"token" => token}) do
+    case LastFm.get_session(token) do
+      {:ok, session} ->
+        conn
+        |> put_session(:last_fm_user, session.name)
+        |> put_session(:last_fm_key, session.key)
+        |> put_flash(:info, "Successfully authenticated with Last.fm.")
+        |> redirect(to: ~p"/")
+
+      {:error, reason} ->
+        conn
+        |> put_flash(:error, "Failed to authenticate with Last.fm: #{reason}")
+        |> redirect(to: ~p"/")
+    end
   end
 end