first commit

Nitrox.Launcher/Models/Validators/SaveNameAttribute.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Nitrox.Launcher.Models.Validators;
+
+/// <summary>Validates a Nitrox save name.</summary>
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter)]
+public class SaveNameAttribute : DataTypeAttribute
+{
+    public SaveNameAttribute() : base(DataType.Text)
+    {
+    }
+
+    public override bool IsValid(object value)
+    {
+        if (value is not string str)
+        {
+            return false;
+        }
+        int indexOfAny = str.IndexOfAny(FileNameAttribute.InvalidPathCharacters);
+        if (indexOfAny > -1)
+        {
+            return false;
+        }
+        if (str.EndsWith(".", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+        return true;
+    }
+}