From 97501782d6f5237b73f9a0c4ca66637ca4278592 Mon Sep 17 00:00:00 2001
From: Robert Ginsburg <rgins16@gmail.com>
Date: Thu, 6 Jul 2023 17:50:53 -0400
Subject: [PATCH] Fixed bug where user-supplied cache is loaded into memory
 before looking into the cache

---
 lib/msal-node/src/client/ClientCredentialClient.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/msal-node/src/client/ClientCredentialClient.ts b/lib/msal-node/src/client/ClientCredentialClient.ts
index be0507fb4c..fa36f3e2f8 100644
--- a/lib/msal-node/src/client/ClientCredentialClient.ts
+++ b/lib/msal-node/src/client/ClientCredentialClient.ts
@@ -25,6 +25,7 @@ import {
     ServerAuthorizationTokenResponse,
     StringUtils,
     TimeUtils,
+    TokenCacheContext,
     UrlString,
 } from "@azure/msal-common";
 
@@ -71,6 +72,16 @@ export class ClientCredentialClient extends BaseClient {
     private async getCachedAuthenticationResult(
         request: CommonClientCredentialRequest
     ): Promise<AuthenticationResult | null> {
+        // read the user-supplied cache into memory, if applicable
+        if (this.config.serializableCache && this.config.persistencePlugin) {
+            const cacheContext = new TokenCacheContext(
+                this.config.serializableCache,
+                true,
+            );
+
+            await this.config.persistencePlugin.beforeCacheAccess(cacheContext);
+        }
+        
         const cachedAccessToken = this.readAccessTokenFromCache();
 
         if (!cachedAccessToken) {