How to subscribe to MS Graph event notifications

Question

Can I use an app registration with delegated Calendars.Read permission to subscribe to calendar event notifications for a given shared email that I own?

I intend to use the JavaScript sdk.

what are the authentication options? is there a way to sign in without a user logging in interactively?

I must not use application type permission because I can’t get access to every one’s calendar.

Answer 1

Hi @Dimitrios Gkiokas

The ROPC flow is an available option that allows applications to log in by directly handling the user's password without browser interaction. However, the ROPC flow does not support MFA, and hardcoding the user's password may pose certain risks. Therefore, we generally do not recommend using the ROPC flow. It should only be used when more secure flows are not feasible.

References: https://learn.microsoft.com/en-us/graph/sdks/choose-authentication-providers?tabs=typescript#usernamepassword-provider.

Hope this helps.

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Answer 2

Hello Dimitrios Gkiokas,

Thank you for reaching out to Microsoft!

Yes, you can use an app registration with delegated permissions Calendars.Read to subscribe to calendar event notifications for a shared email that you own.

For the authentication options, you might have the OAuth 2.o Authorization code flow as this flow allows you to obtain an access token and a refresh token. The refresh token can be used to obtain new access tokens without user interaction, enabling non-interactive sign-ins. Please refer the below mentioned link for detailed information related to non-interactive sign-ins.

Link: Non-interactive user sign-in

Since OAuth 2.o client credential flow is typically used for app-only permissions, this may not be most suitable for the requirement.

Yes, you can achieve non-interactive sign-ins using the OAuth 2.o Authorization Code flow.

Hope this helps.

If the answer is helpful, please click Accept Answer and kindly upvote it. If you have any further questions about this answer, please click Comment.