Azure Identity Extension for Token Cache Persistence
This package provides an extension to the Azure Identity library for JavaScript (@azure/identity
) that enables persistent token caching. Token cache persistence allows the built-in token cache to persist across sessions using a secure storage system provided by the local Operating System.
Source code | Samples
Getting started
Install the package
This package is designed to be used with Azure Identity for JavaScript. Install both @azure/identity
and this package using npm
:
$ npm install --save @azure/identity
$ npm install --save @azure/identity-cache-persistence
Prerequisites
Supported Environments
Azure Identity extensions for JavaScript support stable (even numbered) versions of Node.js starting from v12. While it may run in other Node versions, no support is guaranteed. @azure/identity-cache-persistence
does not support browser environments.
Key concepts
If this is your first time using @azure/identity
or the Microsoft identity platform (Azure Active Directory), we recommend that you read Using @azure/identity
with Microsoft Identity Platform first. This document will give you a deeper understanding of the platform and how to configure your Azure account correctly.
Azure Identity Extensions
As of @azure/identity
version 2.0.0, the Identity client library for JavaScript includes an extension API. This package (@azure/identity-cache-persistence
) exports an extension object that you must pass as an argument to the top-level useIdentityExtension
function from the @azure/identity
package. Enable token cache persistence in your program as follows:
import { useIdentityExtension } from "@azure/identity";
import { cachePersistenceExtension } from "@azure/identity-cache-persistence";
useIdentityExtension(cachePersistenceExtension);
After calling useIdentityExtension
, the persistent token cache extension is registered to the @azure/identity
package and will be available on all credentials that support persistent token caching (those that have tokenCachePersistenceOptions
in their constructor options).
Examples
Once the extension is registered, you can enable token cache persistence by passing tokenCachePersistenceOptions
with an enabled
property set to true
to a credential constructor. In the following example, we use the DeviceCodeCredential
, since persistent caching of its tokens allows you to skip the interactive device-code authentication flow if a cached token is available.
import { useIdentityExtension, DeviceCodeCredential } from "@azure/identity";
import { cachePersistenceExtension } from "@azure/identity-cache-persistence";
useIdentityExtension(cachePersistenceExtension);
async function main() {
const credential = new DeviceCodeCredential({
tokenCachePersistenceOptions: {
enabled: true
}
});
const scope = "https://graph.microsoft.com/.default";
console.log((await credential.getToken(scope)).token.substr(0, 10), "...");
}
main().catch((error) => {
console.error("An error occurred:", error);
process.exit(1);
});
Troubleshooting
Logging
Enabling logging may help uncover useful information about failures. In order to see a log of HTTP requests and responses, set the AZURE_LOG_LEVEL
environment variable to info
. Alternatively, logging can be enabled at runtime by calling setLogLevel
in the @azure/logger
:
import { setLogLevel } from "@azure/logger";
setLogLevel("info");
Next steps
Provide Feedback
If you encounter bugs or have suggestions, please open an issue.
Contributing
If you'd like to contribute to this library, please read the contributing guide to learn more about how to build and test the code.