add alert/notification functionality (for server connection events and messages)

Application/Alerts/AlertExtensions.cs

@@ -0,0 +1,55 @@
+using System;
+using SharedLibraryCore;
+using SharedLibraryCore.Alerts;
+using SharedLibraryCore.Database.Models;
+
+namespace IW4MAdmin.Application.Alerts;
+
+public static class AlertExtensions
+{
+    public static Alert.AlertState BuildAlert(this EFClient client, Alert.AlertCategory? type = null)
+    {
+        return new Alert.AlertState
+        {
+            RecipientId = client.ClientId,
+            Category = type ?? Alert.AlertCategory.Information
+        };
+    }
+
+    public static Alert.AlertState WithCategory(this Alert.AlertState state, Alert.AlertCategory category)
+    {
+        state.Category = category;
+        return state;
+    }
+
+    public static Alert.AlertState OfType(this Alert.AlertState state, string type)
+    {
+        state.Type = type;
+        return state;
+    }
+
+    public static Alert.AlertState WithMessage(this Alert.AlertState state, string message)
+    {
+        state.Message = message;
+        return state;
+    }
+
+    public static Alert.AlertState ExpiresIn(this Alert.AlertState state, TimeSpan expiration)
+    {
+        state.ExpiresAt = DateTime.Now.Add(expiration);
+        return state;
+    }
+    
+    public static Alert.AlertState FromSource(this Alert.AlertState state, string source)
+    {
+        state.Source = source;
+        return state;
+    }
+
+    public static Alert.AlertState FromClient(this Alert.AlertState state, EFClient client)
+    {
+        state.Source = client.Name.StripColors();
+        state.SourceId = client.ClientId;
+        return state;
+    }
+}