From 9a17379e0eb594a87b085e6459416ead6b662b09 Mon Sep 17 00:00:00 2001
From: Chris Bianca <me@chrisbianca.com>
Date: Fri, 27 Oct 2017 14:05:19 +0100
Subject: [PATCH] [auth][js] Add in `onUserChanged` method

---
 lib/modules/auth/index.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/modules/auth/index.js b/lib/modules/auth/index.js
index 3146e74e..378a23aa 100644
--- a/lib/modules/auth/index.js
+++ b/lib/modules/auth/index.js
@@ -66,6 +66,7 @@ export default class Auth extends ModuleBase {
   _setAuthState(auth: AuthResultType) {
     this._authResult = auth;
     this._user = auth && auth.user ? new User(this, auth.user) : null;
+    this.emit(this._getAppEventName('onUserChanged'), this._user);
   }
 
   /**
@@ -149,6 +150,26 @@ export default class Auth extends ModuleBase {
     this.removeListener(this._getAppEventName('onIdTokenChanged'), listener);
   }
 
+  /**
+   * Listen for user changes.
+   * @param listener
+   */
+  onUserChanged(listener: Function) {
+    this.log.info('Creating onUserChanged listener');
+    this.on(this._getAppEventName('onUserChanged'), listener);
+    if (this._authResult) listener(this._user || null);
+    return this._offUserChanged.bind(this, listener);
+  }
+
+  /**
+   * Remove user change listener
+   * @param listener
+   */
+  _offUserChanged(listener: Function) {
+    this.log.info('Removing onUserChanged listener');
+    this.removeListener(this._getAppEventName('onUserChanged'), listener);
+  }
+
   /**
    * Sign the current user out
    * @return {Promise}