Separate admin access from finance lock

TrafagSalesExporter/Services/LandingPageSettingsService.cs

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+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using Microsoft.Extensions.Options;
+using TrafagSalesExporter.Security;
+
+namespace TrafagSalesExporter.Services;
+
+public interface ILandingPageSettingsService
+{
+    bool ShowWalkingLabFigure { get; }
+    void SetShowWalkingLabFigure(bool value);
+}
+
+public sealed class LandingPageSettingsService : ILandingPageSettingsService
+{
+    private static readonly object FileLock = new();
+    private readonly LandingPageOptions _options;
+    private readonly IHostEnvironment _environment;
+
+    public LandingPageSettingsService(IOptions<LandingPageOptions> options, IHostEnvironment environment)
+    {
+        _options = options.Value;
+        _environment = environment;
+    }
+
+    public bool ShowWalkingLabFigure => _options.ShowWalkingLabFigure;
+
+    public void SetShowWalkingLabFigure(bool value)
+    {
+        _options.ShowWalkingLabFigure = value;
+        SaveSetting(value);
+    }
+
+    private void SaveSetting(bool value)
+    {
+        var path = Path.Combine(_environment.ContentRootPath, "appsettings.json");
+
+        lock (FileLock)
+        {
+            var json = File.Exists(path)
+                ? File.ReadAllText(path, Encoding.UTF8)
+                : "{}";
+
+            var root = JsonNode.Parse(json)?.AsObject() ?? new JsonObject();
+            var section = root[LandingPageOptions.SectionName] as JsonObject;
+            if (section is null)
+            {
+                section = new JsonObject();
+                root[LandingPageOptions.SectionName] = section;
+            }
+
+            section[nameof(LandingPageOptions.ShowWalkingLabFigure)] = value;
+            var options = new JsonSerializerOptions { WriteIndented = true };
+            File.WriteAllText(path, root.ToJsonString(options), new UTF8Encoding(false));
+        }
+    }
+}