builders and update rebuilds

util/Setup/AppIdBuilder.cs

@@ -0,0 +1,39 @@
+using System;
+using System.IO;
+
+namespace Bit.Setup
+{
+    public class AppIdBuilder
+    {
+        public AppIdBuilder(string url)
+        {
+            Url = url;
+        }
+
+        public string Url { get; private set; }
+
+        public void Build()
+        {
+            Console.WriteLine("Building FIDO U2F app id.");
+            Directory.CreateDirectory("/bitwarden/web/");
+            using(var sw = File.CreateText("/bitwarden/web/app-id.json"))
+            {
+                sw.Write($@"{{
+  ""trustedFacets"": [
+    {{
+      ""version"": {{
+        ""major"": 1,
+        ""minor"": 0
+      }},
+      ""ids"": [
+        ""{Url}"",
+        ""ios:bundle-id:com.8bit.bitwarden"",
+        ""android:apk-key-hash:dUGFzUzf3lmHSLBDBIv+WaFyZMI""
+      ]
+    }}
+  ]
+}}");
+            }
+        }
+    }
+}