Fastify plugin implementing MS Graph Change Notifications webhook.

npm i --save fastify-msgraph-change-notification-webhook

The plugin requires at least fastify:4.x.

const fastifyChangeNotificationWebhook = require('fastify-msgraph-change-notification-webhook')
const fastify = require('fastify')()

/** ... setup fastify instance ... */

fastify.register(fastifyChangeNotificationWebhook, {
    path: '/your-webhook-path'
    subscriptions: {
        'subscription-1': {
            clientState: 'subscription-1-secret',
            callback: (notification) => console.log('subscription-1 sent notification', notification)
        },
        'subscription-2': {
            clientState: 'subscription-2-secret',
            callback: (notification) => console.log('subscription-2 sent notification', notification)
        }
    },
})

This plugin exposes a POST route under the path provided by the plugin which:

• implements validation url procedure;

• for each change notification received:

  • verifies that the change notification secret is valid;
  • executes a callback.

  Secrets and callbacks are provided to the plugin by the subscriptions object. It's a key-value pair JSON where each entry has its own MS Graph subscriptionId and contains the following information:

  • clientState: the value provided during subscription to validate change notifications;
  • callback: a function that will process the notification

The route responds with status code 200 if all callbacks during a request are executed correctly, otherwise a status code 500 will be returned: this means that MS Graph will try to re-process the notification later.

Also, the plugin exposes a copy of the subscriptions object through your fastify instance.