Added extension to get domain name from HttpContext

Author: jamesmcroft

src/MADE.Web/Extensions/HttpContextExtensions.cs

@@ -0,0 +1,23 @@
+// MADE Apps licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace MADE.Web.Extensions
+{
+    using Microsoft.AspNetCore.Http;
+
+    /// <summary>
+    /// Defines a collection of extensions for a <see cref="HttpContext" /> object.
+    /// </summary>
+    public static class HttpContextExtensions
+    {
+        /// <summary>
+        /// Gets the domain name of the requesting context.
+        /// </summary>
+        /// <param name="context">The requesting <see cref="HttpContext"/>.</param>
+        /// <returns>The domain part of the request's host.</returns>
+        public static string GetDomain(this HttpContext context)
+        {
+            return context.Request.Host.Host;
+        }
+    }
+}