From a21a94078ba855b25601fe97141b30b8b55c24c9 Mon Sep 17 00:00:00 2001
From: Ray DeCampo <ray@decampo.org>
Date: Sun, 24 Dec 2017 11:35:11 -0500
Subject: [PATCH] KEYCLOAK-5578: Keycloak JS adapter returns native Promise
 instances when available. Promise instances are adorned with success() and
 error() functions to retain backwards compatibility.

---
 .../oidc/js/src/main/resources/keycloak.js    | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/adapters/oidc/js/src/main/resources/keycloak.js b/adapters/oidc/js/src/main/resources/keycloak.js
index e1cfe56bf6..37875f4339 100755
--- a/adapters/oidc/js/src/main/resources/keycloak.js
+++ b/adapters/oidc/js/src/main/resources/keycloak.js
@@ -772,6 +772,43 @@
         }
 
         function createPromise() {
+            if (typeof Promise === "function") {
+                return createNativePromise();
+            } else {
+                return createLegacyPromise();
+            }
+        }
+
+        function createNativePromise() {
+            // Need to create a native Promise which also preserves the
+            // interface of the custom promise type previously used by the API
+            var p = {
+                setSuccess: function(result) {
+                    p.success = true;
+                    p.resolve(result);
+                },
+
+                setError: function(result) {
+                    p.success = false;
+                    p.reject(result);
+                }
+            };
+            p.promise = new Promise(function(resolve, reject) {
+                p.resolve = resolve;
+                p.reject = reject;
+            });
+            p.promise.success = function(callback) {
+                p.promise.then(callback);
+                return p.promise;
+            }
+            p.promise.error = function(callback) {
+                p.promise.catch(callback);
+                return p.promise;
+            }
+            return p;
+        }
+
+        function createLegacyPromise() {
             var p = {
                 setSuccess: function(result) {
                     p.success = true;