Get user Identity and Claims from HTTP Request Headers

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;
using System.IdentityModel.Tokens.Jwt;

// DEMO: Get user Identity and Claims from the Token Headers
namespace ClaimsDemo.Function
{
    public static class ClaimsDemo
    {
        [FunctionName("ClaimsDemo")]
        public static IActionResult Run
            ([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]
             HttpRequest req, ILogger log)
        {

            //Extract user Name and AAD ID Token from the request headers
            var userId = req.Headers["X-MS-CLIENT-PRINCIPAL-NAME"];
            var userIDToken = req.Headers["X-MS-TOKEN-AAD-ID-TOKEN"];

            log.LogInformation("User ID: " + userId);
            log.LogInformation("User ID Token: " + userIDToken);

            //Read and decode the JWT
            var jwttoken = new JwtSecurityTokenHandler().ReadJwtToken(userIDToken) as JwtSecurityToken;

            //Extract the claims from the JWT
            foreach (Claim claim in jwttoken.Claims)
            {
                log.LogInformation(claim.Type + " : " + claim.Value + "\n");
            }

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