first commit

Nitrox.Launcher/Models/Validators/NotEndsWithAttribute.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Nitrox.Launcher.Models.Validators;
+
+/// <summary>
+///     Tests that the value doesn't end with the specified text.
+/// </summary>
+public sealed class NotEndsWithAttribute(string text, StringComparison comparison = StringComparison.OrdinalIgnoreCase) : TypedValidationAttribute<string>
+{
+    protected override ValidationResult IsValid(string value, ValidationContext context)
+    {
+        if (value == null)
+        {
+            return ValidationResult.Success;
+        }
+        return value.EndsWith(text, comparison) ? new ValidationResult($"{context.DisplayName} must not contain the text '{text}' at the end.") : ValidationResult.Success;
+    }
+}