adding security

api/HelloYou.cs

@@ -0,0 +1,45 @@
+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Azure.WebJobs;
+using Microsoft.Azure.WebJobs.Extensions.Http;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+using System.Security.Claims;
+
+namespace Company.Function
+{
+    public static class HelloYou
+    {
+        [FunctionName("HelloYou")]
+        public static async Task<IActionResult> Run(
+            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "secured/HelloYou")] HttpRequest req,
+            ILogger log,
+            ClaimsPrincipal principal)
+        {
+            log.LogInformation("C# HTTP trigger function processed a request.");
+            bool isClaimValid = true;
+            string userId = string.Empty;
+
+            if (principal == null)
+            {
+                log.LogWarning("No principal.");
+                isClaimValid = false;
+            }
+
+            if(isClaimValid)
+            {
+                userId = principal.FindFirst(ClaimTypes.GivenName).Value;
+                log.LogInformation("Authenticated user {user}.", userId);
+            }
+
+            string responseMessage = string.IsNullOrEmpty(userId)
+                ? "This SECURED HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
+                : $"Bonjour Hi, {userId}. This SECURED HTTP triggered function executed successfully.";
+
+            return new OkObjectResult(responseMessage);
+        }
+    }
+}