replace coherence with guardian

lib/eventos_web/controllers/session_controller.ex

@@ -0,0 +1,27 @@
+defmodule EventosWeb.SessionController do
+  use EventosWeb, :controller
+  alias Eventos.Accounts.User
+  alias Eventos.Accounts
+
+  def sign_in(conn, %{"email" => email, "password" => password}) do
+    with %User{} = user <- Accounts.find(email) do
+      # Attempt to authenticate the user
+      with {:ok, token, _claims} <- Accounts.authenticate(%{user: user, password: password}) do
+        # Render the token
+        render conn, "token.json", token: token
+      end
+    end
+  end
+
+  def sign_out(conn, _params) do
+    conn
+    |> Eventos.Guardian.Plug.sign_out()
+    |> send_resp(204, "")
+  end
+
+  def show(conn, _params) do
+    user = Eventos.Guardian.Plug.current_resource(conn)
+
+    send_resp(conn, 200, Poison.encode!(%{user: user}))
+  end
+end