GraphHelper.cs

using Azure.Core;
using Azure.Identity;
using Microsoft.Graph;


public class GraphHelper
{
	// Settings object
	private static Settings? _settings;
	// User auth token credential
	private static DeviceCodeCredential? _deviceCodeCredential;
	// Client configured with user authentication
	private static GraphServiceClient? _userClient;

	public static void InitializeGraphForUserAuth(Settings settings,
		Func<DeviceCodeInfo, CancellationToken, Task> deviceCodePrompt)
	{
		_settings = settings;

		_deviceCodeCredential = new DeviceCodeCredential(deviceCodePrompt,
			settings.TenantId, settings.ClientId);

		_userClient = new GraphServiceClient(_deviceCodeCredential, settings.GraphUserScopes);
	}
	public static async Task<string> GetUserTokenAsync()
	{
		// Ensure credential isn't null
		_ = _deviceCodeCredential ??
			throw new System.NullReferenceException("Graph has not been initialized for user auth");

		// Ensure scopes isn't null
		_ = _settings?.GraphUserScopes ?? throw new System.ArgumentNullException("Argument 'scopes' cannot be null");

		// Request token with given scopes
		var context = new TokenRequestContext(_settings.GraphUserScopes);
		var response = await _deviceCodeCredential.GetTokenAsync(context);
		return response.Token;
	}

	public static Task<Presence> GetUsersPresenceAsync(string userId)
	{
		// Ensure client isn't null
		_ = _userClient ??
			throw new System.NullReferenceException("Graph has not been initialized for user auth");

		return _userClient.Users[userId].Presence
			.Request()
			.GetAsync();
	}
}