Graph API & OAuth 2.0 Configuration for Office 365

Owned by Elliot Dooleysmith
Last updated: Sept 09, 2022
6 min read

This guide covers how to configure ResourceXpress to use OAuth 2.0 to connect with Office 365.

Pre-requisites & Limitations

If using ResourceXpress v2021.5 HF2 or earlier versions, Exchange Impersonation for all resource mailboxes is mandatory for the service account(s).

Please see the https://resourcexpress.atlassian.net/wiki/spaces/RSG/pages/106233906 configuration guide for instructions to configure Impersonation.

An Exchange service account with mailbox impersonation rights is not required for ResourceXpress v2021.6 and later versions.

ResourceXpress Settings

To configure OAuth in ResourceXpress first sign into the admin console, using the navigation menu across the top select Administration Settings then System Settings, the OAuth options can be found under the Resource Server tab.

If using a Hybrid Licence ensure Exchange is selected in the Booking System dropdown.

These settings can also be applied to individual Resource Profiles or https://resourcexpress.atlassian.net/wiki/spaces/RSG/pages/125567008.

For individual profiles follow this same procedure but fill in the options found under the Connection Properties tab found in the profile settings.

For Location-based Systems follow this procedure filling in the settings by location found under the Locations tab in System Settings.

The Server Host Name will need to be set to https://graph.microsoft.com/v1.0.

Select Yes for Use Graph API

Follow the steps below in a new tab/browser window to get get the OAuth Tenant ID, Client ID and Client Secret.

Register an Azure Active Directory App

Navigate to https://portal.azure.com, from here select Azure Active Directory.

From the left-side menu choose App registrations then click New registration.

In the Register an application window enter a name for your application.
Select the Supported account types and click the Register button.

Add API Permissions

Select API Permissions under Manage, found on the left menu.

Calendars.ReadWrite permission required

Click the Add a permission button from the API permissions window.

From the Select an API window choose the Microsoft Graph tab.

Select Application permissions and choose the Calendars.ReadWrite option and click Add permissions.

Next, click Grant admin consent and then Accept from the confirmation dialogue box.

Make sure that admin consent has been granted to the Calendars.ReadWrite permission, this may require the page to be refreshed.

Mail.Send permission optional

Click the Add a permission button from the API permissions window.

From the Select an API window choose the Microsoft Graph tab.

Select Application permissions and choose the Mail.Send option and click Add permissions.

Next, click Grant admin consent and then Accept from the confirmation dialogue box.

Make sure that admin consent has been granted to the Mail.Send permission, this may require the page to be refreshed.

Users.Read.All & Group.Read.All permission optional

Click the Add a permission button from the API permissions window.

From the Select an API window choose the Microsoft Graph tab.

Select Application permissions and check the box for the User.Read.All and Group.Read.All options and click Add permissions.

Next, click Grant admin consent and then Accept from the confirmation dialogue box.

Make sure that admin consent has been granted to the permissions, this may require the page to be refreshed.

 

Generate the Client Secret

Select Certificates & secrets from the left menu found under Manage.

Then click New client secret.
Enter a Description and select the option for Expiry.

Click Add.

Click the Copy to clipboard option for this client secret, return the ResourceXpress Admin Console tab and paste this value into the OAuth Client Secret field.

Getting the Client & Tenant ID’s

Return to the Azure Portal, select Overview from the left menu.

From here copy the Application (client) ID and Directory (tenant) ID and paste these into the relevant fields in the ResourceXpress Admin Console.

The Azure Portal page can now be closed.

ResourceXpress On-Prem

If using ResourceXpress On-Prem then a modification will need to be made to the web.config file to allow Microsoft Graph API to work.

This can be found in the root directory for the ResourceXpress installation.
By default this is C:\\inetpub\wwwroot\

Using your preferred editor, add the below link into the web.config file.

<add key="GraphApiOAuthParameters" value="grant_type=client_credentials&amp;client_id=$$clientId$$&amp;client_secret=$$clientSecret$$&amp;scope=https://graph.microsoft.com/.default"/>

After making the modification, save this file and restart the IIS application pool.

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