diff --git a/Tests/LibMatrix.HomeserverEmulator/Controllers/LegacyController.cs b/Tests/LibMatrix.HomeserverEmulator/Controllers/LegacyController.cs
new file mode 100644
index 0000000..e3f781b
--- /dev/null
+++ b/Tests/LibMatrix.HomeserverEmulator/Controllers/LegacyController.cs
@@ -0,0 +1,56 @@
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
+using System.Text.Json.Nodes;
+using ArcaneLibs.Extensions;
+using LibMatrix.EventTypes.Spec.State;
+using LibMatrix.HomeserverEmulator.Services;
+using LibMatrix.Responses;
+using LibMatrix.Services;
+using Microsoft.AspNetCore.Mvc;
+
+namespace LibMatrix.HomeserverEmulator.Controllers;
+
+[ApiController]
+[Route("/_matrix/client/{version}/")]
+public class LegacyController(ILogger<LegacyController> logger, TokenService tokenService, UserStore userStore, RoomStore roomStore) : ControllerBase {
+ [HttpGet("rooms/{roomId}/initialSync")]
+ [SuppressMessage("ReSharper.DPA", "DPA0011: High execution time of MVC action", Justification = "Endpoint is expected to wait until data is available or timeout.")]
+ public async Task<object> Sync([FromRoute] string roomId, [FromQuery] int limit = 20) {
+ var sw = Stopwatch.StartNew();
+ var token = tokenService.GetAccessToken(HttpContext);
+ if (token == null)
+ throw new MatrixException() {
+ ErrorCode = "M_MISSING_TOKEN",
+ Error = "Missing token"
+ };
+
+ var user = await userStore.GetUserByToken(token);
+ if (user == null)
+ throw new MatrixException() {
+ ErrorCode = "M_UNKNOWN_TOKEN",
+ Error = "No such user"
+ };
+ var room = roomStore.GetRoomById(roomId);
+ if (room is null)
+ throw new MatrixException() {
+ ErrorCode = "M_NOT_FOUND",
+ Error = "Room not found."
+ };
+ var accountData = room.AccountData.GetOrCreate(user.UserId, _ => []);
+ var membership = room.State.FirstOrDefault(x => x.Type == "m.room.member" && x.StateKey == user.UserId);
+ var timelineChunk = room.Timeline.TakeLast(limit).ToList();
+ return new {
+ account_data = accountData,
+ membership = (membership?.TypedContent as RoomMemberEventContent)?.Membership ?? "leave",
+ room_id = room.RoomId,
+ state = room.State.ToList(),
+ visibility = "public",
+ messages = new PaginatedChunkedStateEventResponse() {
+ Chunk = timelineChunk,
+ End = timelineChunk.Last().EventId,
+ Start = timelineChunk.Count >= limit ? timelineChunk.First().EventId : null
+ }
+ };
+ }
+}
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