ClientCredentials: Fixed bug where user-supplied cache is loaded into memory only after network request

change/@azure-msal-common-ae269072-8357-4cb8-994d-5693622cf944.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "ClientCredentials: Fixed bug where user-supplied cache is loaded into memory only after network request #6218",
+  "packageName": "@azure/msal-common",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

change/@azure-msal-node-c1a45be3-8104-4384-8fb0-b0c3c22cf892.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "ClientCredentials: Fixed bug where user-supplied cache is loaded into memory only after network request #6218",
+  "packageName": "@azure/msal-node",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

lib/msal-common/src/cache/CacheManager.ts

@@ -39,6 +39,9 @@ import { AuthorityMetadataEntity } from "./entities/AuthorityMetadataEntity";
 import { BaseAuthRequest } from "../request/BaseAuthRequest";
 import { Logger } from "../logger/Logger";
 import { name, version } from "../packageMetadata";
+import { ISerializableTokenCache } from "./interface/ISerializableTokenCache";
+import { ICachePlugin } from "./interface/ICachePlugin";
+import { TokenCacheContext } from "./persistence/TokenCacheContext";
 
 /**
  * Interface class which implement cache storage functions used by MSAL to perform validity checks, and store tokens.
@@ -216,6 +219,25 @@ export abstract class CacheManager implements ICacheManager {
         credential: ValidCredentialType
     ): string;
 
+    /**
+     * Read the user-supplied cache into memory, if applicable
+     * @param serializableCache 
+     * @param persistencePlugin 
+     */
+    async readUserDefinedCacheIntoMemory(
+        serializableCache: ISerializableTokenCache | null,
+        persistencePlugin: ICachePlugin | null
+    ): Promise<void> {
+        if (serializableCache && persistencePlugin) {
+            const cacheContext = new TokenCacheContext(
+                serializableCache,
+                true,
+            );
+
+            await persistencePlugin.beforeCacheAccess(cacheContext);
+        }
+    }
+
     /**
      * Returns all accounts in cache
      */

lib/msal-node/src/client/ClientCredentialClient.ts

@@ -71,6 +71,9 @@ export class ClientCredentialClient extends BaseClient {
     private async getCachedAuthenticationResult(
         request: CommonClientCredentialRequest
     ): Promise<AuthenticationResult | null> {
+        // read the user-supplied cache into memory, if applicable
+        await this.cacheManager.readUserDefinedCacheIntoMemory(this.config.serializableCache, this.config.persistencePlugin);
+
         const cachedAccessToken = this.readAccessTokenFromCache();
 
         if (!cachedAccessToken) {