Import december-2020-12-18 from private repo (scrubbed 2026-05-27)

Targets Rec Room 2020.12.18 client.

Re-import after adding:
- DorkNet.ClientMod/dorknet-clientmod.json.template — config schema
  the launcher's manifest-driven patcher renders into UserData/.
- tools/build-patcher-zip.ps1 — produces the dorknet-clientpatch-{key}.zip
  Release asset the launcher fetches.
- .github/workflows/release.yml — auto-publishes both Release assets
  on v1-december-* tag push.

Scrubbed via maintainer-side scrub-for-public.ps1: same drop rules as
the prior import, plus build-patcher-zip.ps1 added to the tools/
allow-list so it survives the scrub.

DorkNet.Server/Controllers/API/Settings/V2/SettingsController.cs

@@ -0,0 +1,101 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using DorkNet.Server.Auth;
+using DorkNet.Server.Data;
+using DorkNet.Server.Data.Entities;
+using System.Text.Json.Serialization;
+
+namespace DorkNet.Server.Controllers.API.Settings.V2;
+
+/// <summary>
+/// api.rec.net/api/settings/v2 — player settings download / set / remove.
+/// URL patterns (verified by disassembling RecNet.Settings$$DowloadLocalPlayerSettings
+/// at RVA 0xAF55B0 and RecNet.Settings$$StoreLocalPlayerSetting at RVA 0xAF5650):
+///
+///   GET    api/settings/v2/        — returns List&lt;{Key, Value}&gt;
+///   POST   api/settings/v2/set     — body { Key, Value } (set or update one)
+///   POST   api/settings/v2/remove  — body { Key } (delete one)
+///
+/// The CLIENT side parses the GET response with Util.DeserializeList&lt;Setting&gt;
+/// and reads each entry's "Key" and "Value" fields (verified by string literal
+/// references in the deserializer body — both are PascalCase).
+///
+/// Returning a Dictionary&lt;string,string&gt; here serializes as "{}"
+/// when empty, which the client casts to a List and dies with
+/// InvalidCastException: Unable to cast object of type 'Dictionary`2' to
+/// type 'List`1'. Always return a real List.
+/// </summary>
+[ApiController]
+[Route("api/[controller]/v2")]
+[Authorize]
+public class SettingsController(DorkNetDbContext db) : ControllerBase
+{
+    private long CurrentPlayerId => this.RequireCurrentPlayerId();
+
+    [HttpGet]
+    [HttpGet("get")]
+    public async Task<IActionResult> GetSettings()
+    {
+        var settings = await db.PlayerSettings
+            .Where(s => s.PlayerId == CurrentPlayerId)
+            .Select(s => new SettingDto { Key = s.Key, Value = s.Value })
+            .ToListAsync();
+        return Ok(settings);
+    }
+
+    [HttpPost("set")]
+    public async Task<ActionResult> SetSetting([FromBody] SetSettingRequest req)
+    {
+        var existing = await db.PlayerSettings
+            .FirstOrDefaultAsync(s => s.PlayerId == CurrentPlayerId && s.Key == req.Key);
+
+        if (existing is null)
+        {
+            db.PlayerSettings.Add(new PlayerSettingEntity
+            {
+                PlayerId = CurrentPlayerId,
+                Key = req.Key,
+                Value = req.Value,
+            });
+        }
+        else
+        {
+            existing.Value = req.Value;
+        }
+
+        await db.SaveChangesAsync();
+        return Ok(new SettingDto { Key = req.Key, Value = req.Value });
+    }
+
+    [HttpPost("remove")]
+    public async Task<ActionResult> RemoveSetting([FromBody] SetSettingRequest req)
+    {
+        var existing = await db.PlayerSettings
+            .FirstOrDefaultAsync(s => s.PlayerId == CurrentPlayerId && s.Key == req.Key);
+        if (existing is not null)
+        {
+            db.PlayerSettings.Remove(existing);
+            await db.SaveChangesAsync();
+        }
+        return Ok();
+    }
+}
+
+public class SettingDto
+{
+    [JsonPropertyName("Key")]
+    public string Key { get; set; } = string.Empty;
+
+    [JsonPropertyName("Value")]
+    public string Value { get; set; } = string.Empty;
+}
+
+public class SetSettingRequest
+{
+    [JsonPropertyName("Key")]
+    public string Key { get; set; } = string.Empty;
+
+    [JsonPropertyName("Value")]
+    public string Value { get; set; } = string.Empty;
+}