Get ClaimsPrincipal from the Request Context

ClaimsDemo.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Extensions.Logging;
using System.Security.Claims;

// DEMO: Get ClaimsPrincipal from the request context
namespace ClaimsDemo.Function
{
    public static class ClaimsDemo
    {
        [FunctionName("ClaimsDemo")]
        public static IActionResult Run
            ([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]
             HttpRequest req, ILogger log)
        {
            ClaimsPrincipal claimIdentity = req.HttpContext.User;

            log.LogInformation("User ID: " + claimIdentity.Identity.Name);
            
            log.LogInformation("Claim Type : Claim Value");

            foreach (Claim claim in claimIdentity.Claims)
            {
                log.LogInformation(claim.Type + " : " + claim.Value + "\n");
            }

            return new OkObjectResult("Success");
        }
    }
}