From 63d34f7990f4fc277166e032a63426d3613294d9 Mon Sep 17 00:00:00 2001
From: Brandon Orther <brandon@omt.tech>
Date: Sun, 3 Dec 2017 22:20:47 -0800
Subject: [PATCH] Fix BUG performLogin called multiple times

Since `enable` caused the policy function to be called for every action dispatched to the store, any action(s) dispatched after performLogin was called and before `state.cognito.state` transitioned from `LOGGING_IN` to something else caused `performLogin` to be called.

To fix this bug the store subscription handler checks if `state.cognito.state` has changed and only calls the policy function if it has.
---
 src/policy.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/policy.js b/src/policy.js
index 43e1436..cd5cffe 100644
--- a/src/policy.js
+++ b/src/policy.js
@@ -10,10 +10,16 @@ import { CognitoState } from './states';
  * @param {function} f - f(state, dispatch)
 */
 const enable = (store, f, params) => {
+  let currentCognitoState;
+
   store.subscribe(() => {
     const state = store.getState();
     const dispatch = store.dispatch;
-    f(state, dispatch, params);
+      
+    if (state.cognito.state !== currentCognitoState) {
+      currentCognitoState = state.cognito.state;
+      f(state, dispatch, params);
+    }
   });
 };