How to implement EWS API for connecting Outlook on-premise user's calendar data

Aliraza HN 5

Our website(which is built on Rails framework) has Outlook calendar integration through which our client's user can connect their Outlook calendar & then we fetch or push events to their Outlook calendar,

Currently, we are using this API for authenticating users on Outlook: "https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=#{AZURE_APP_CLIENT_ID}&redirect_uri=https://our_website.com/auth/microsoft_graph_auth/callback&response_mode=query&response_type=code&scope=calendars.readwrite%20offline_access&state=encrypted_code

Once a user is authenticated we fetch all events using this API: 'https://graph.microsoft.com/v1.0/me/calendarView'

But the problem is some of our clients have "Outlook on-premise" instead of normal cloud-based Outlook, How do we connect users with their Outlook on-premise account, What changes will we have to make in the above implementation? Please see I am completely new in this & don't have in-depth knowledge

Aliraza HN 5 Reputation points

2024-08-29T06:33:02.75+00:00

Till where I could research using EWS API we can fetch users calendar data & I was able to do it,

but the problem we have is we need to pass a username & password every time in the request, which is a security concern as we don't store users password on our end

I could see Exchange provides OAuth but the documentation says it's only available for Exchange Online & our clients are hosted completely on-premise (using Exchange Server 2019 CU14)

We thought of asking the client to implement ADFS, not sure if it will allow us to achieve our goal(i.e. to fetch & create events in their calendar)

Can anyone please confirm that if we pass ADFS access token using EWS API it will work or not?

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How to implement EWS API for connecting Outlook on-premise user's calendar data

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