add ClaimsPrincipal extension methods

Oqtane.Server/Extensions/ClaimsPrincipalExtensions.cs

@@ -0,0 +1,54 @@
+using System.Linq;
+using System.Security.Claims;
+
+namespace Oqtane.Extensions
+{
+    public static class ClaimsPrincipalExtensions
+    {
+        public static string Username(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal.HasClaim(item => item.Type == ClaimTypes.Name))
+            {
+                return claimsPrincipal.Claims.FirstOrDefault(item => item.Type == ClaimTypes.Name).Value;
+            }
+            else
+            {
+                return "";
+            }
+        }
+
+        public static int UserId(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal.HasClaim(item => item.Type == ClaimTypes.NameIdentifier))
+            {
+                return int.Parse(claimsPrincipal.Claims.First(item => item.Type == ClaimTypes.NameIdentifier).Value);
+            }
+            else
+            {
+                return -1;
+            }
+        }
+
+        public static string Roles(this ClaimsPrincipal claimsPrincipal)
+        {
+            var roles = "";
+            foreach (var claim in claimsPrincipal.Claims.Where(item => item.Type == ClaimTypes.Role))
+            {
+                roles += ((roles == "") ? "" : ";") + claim.Value;
+            }
+            return roles;
+        }
+
+        public static string SiteKey(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal.HasClaim(item => item.Type == "sitekey"))
+            {
+                return claimsPrincipal.Claims.FirstOrDefault(item => item.Type == "sitekey").Value;
+            }
+            else
+            {
+                return "";
+            }
+        }
+    }
+}