first commit

Nitrox.Launcher/Models/Validators/NitroxUniqueSaveName.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.IO;
+
+namespace Nitrox.Launcher.Models.Validators;
+
+/// <summary>
+///     Tests that the save name doesn't conflict with other Nitrox saves.
+/// </summary>
+public sealed class NitroxUniqueSaveName : TypedValidationAttribute<string>
+{
+    public string SavesFolderDirPropertyName { get; }
+    public bool AllowCaseInsensitiveName { get; }
+    public string OriginalValuePropertyName { get; }
+
+    public NitroxUniqueSaveName(string savesFolderDirPropertyName, bool allowCaseInsensitiveName = false, string originalValuePropertyName = null)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(savesFolderDirPropertyName);
+        SavesFolderDirPropertyName = savesFolderDirPropertyName;
+        AllowCaseInsensitiveName = allowCaseInsensitiveName;
+        OriginalValuePropertyName = originalValuePropertyName;
+    }
+
+    protected override ValidationResult IsValid(string value, ValidationContext context)
+    {
+        static bool SaveFolderExists(string folderName, bool matchExact, string savesFolderDir)
+        {
+            if (!matchExact)
+            {
+                foreach (string dir in Directory.EnumerateDirectories(savesFolderDir))
+                {
+                    if (Path.GetFileName(dir).Equals(folderName, StringComparison.Ordinal))
+                    {
+                        return true;
+                    }
+                }
+                return false;
+            }
+
+            return Path.Exists(Path.Combine(savesFolderDir, folderName));
+        }
+
+        if (!Directory.Exists(ReadProperty<string>(context, SavesFolderDirPropertyName)))
+        {
+            return ValidationResult.Success;
+        }
+        if (!string.IsNullOrEmpty(OriginalValuePropertyName) && value == ReadProperty<string>(context, OriginalValuePropertyName))
+        {
+            return ValidationResult.Success;
+        }
+        if (SaveFolderExists(value, !AllowCaseInsensitiveName, ReadProperty<string>(context, SavesFolderDirPropertyName)))
+        {
+            return new ValidationResult($@"Save ""{value}"" already exists.");
+        }
+
+        return ValidationResult.Success;
+    }
+}