last ...

Constants/XAiServiceConstants.cs

@@ -0,0 +1,16 @@
+namespace xAiService.Constants
+{
+    public struct XAiServiceConstants
+    {
+        //
+        // Service Extensions Log Tag ...
+        public const string XAiServiceDILogTag = "XAiService";
+        
+        //
+        // File Provider Identifiers ...
+        public const string XAiProjectFilesIdentifier = "AiPrjF";
+        public const string XAiMessageFilesIdentifier = "AiMsgF";
+        public const string XMetaDataFileIdsIdentifier = "FileIds";
+        public const string XAiConversationFilesIdentifier = "AiCnvrF";
+    }
+}

Extensions/XAiServiceExtensions.cs

@@ -0,0 +1,44 @@
+using xCommons.Extensions;
+using xExceptions.Constants;
+using xIdentityModels.Models;
+
+namespace xAiService.Extensions
+{
+    public static class XAiServiceExtensions
+    {
+        /// <summary>
+        /// Validate User Info ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static bool IsValid(this XUserClaimsInfoDto source)
+        {
+            //
+            var result =
+                !source.IsNullOrDefault() &&
+                !source.UserId.IsNullOrEmpty() &&
+                !source.AccessToken.IsNullOrEmpty();
+
+            //
+            return result;
+        }
+
+        /// <summary>
+        /// Validate User Info ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <param name="invalidException"></param>
+        public static void Validate(
+            this XUserClaimsInfoDto source,
+            XException invalidException = XException.InvalidArgs
+        )
+        {
+            //
+            var isValid = source.IsValid();
+            if (!isValid)
+            {
+                invalidException.Throw();
+            }
+        }
+    }
+}

xAiService.csproj

@@ -26,6 +26,7 @@
   <!-- Local Projects -->
   <ItemGroup>
     <ProjectReference Include="..\xAiModels\xAiModels.csproj" />
+    <ProjectReference Include="..\xFileService\xFileService.csproj" />
   </ItemGroup>
 
   <!-- Local Modules -->