Login per email token. With logout of previous account if already logged in.

lib/beet_round_server/accounts.ex

@@ -57,6 +57,13 @@ defmodule BeetRoundServer.Accounts do
     if User.valid_password?(user, password), do: user
   end
 
+  def get_user_by_email_token(token) do
+    {:ok, query} =
+      UserToken.verify_email_token_query(token, "session")
+
+    Repo.one(query)
+  end
+
   @doc """
   Gets a single user.