centralize ConfigurationBuilder

src/Core/Utilities/ConfigurationBuilderExtensions.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+
+namespace Bit.Core.Utilities
+{
+    public static class ConfigurationBuilderExtensions
+    {
+        public static IConfigurationBuilder AddSettingsConfiguration<T>(
+            this ConfigurationBuilder builder,
+            IHostingEnvironment env) where T : class
+        {
+            builder.SetBasePath(env.ContentRootPath)
+                .AddJsonFile("settings.json")
+                .AddJsonFile($"settings.{env.EnvironmentName}.json", optional: true);
+
+            if(env.IsDevelopment())
+            {
+                builder.AddUserSecrets<T>();
+            }
+
+            builder.AddEnvironmentVariables();
+
+            return builder;
+        }
+    }
+}