diff --git a/LibMatrix/Helpers/RoomBuilder.cs b/LibMatrix/Helpers/RoomBuilder.cs
new file mode 100644
index 0000000..bef7568
--- /dev/null
+++ b/LibMatrix/Helpers/RoomBuilder.cs
@@ -0,0 +1,173 @@
+using System.Runtime.Intrinsics.X86;
+using LibMatrix.EventTypes.Spec.State.RoomInfo;
+using LibMatrix.Homeservers;
+using LibMatrix.Responses;
+using LibMatrix.RoomTypes;
+
+namespace LibMatrix.Helpers;
+
+public class RoomBuilder {
+ public string? Type { get; set; }
+ public string Version { get; set; } = "11";
+ public RoomNameEventContent Name { get; set; } = new();
+ public RoomTopicEventContent Topic { get; set; } = new();
+ public RoomAvatarEventContent Avatar { get; set; } = new();
+ public RoomCanonicalAliasEventContent CanonicalAlias { get; set; } = new();
+ public string AliasLocalPart { get; set; } = string.Empty;
+ public bool IsFederatable { get; set; } = true;
+ public long OwnPowerLevel { get; set; } = MatrixConstants.MaxSafeJsonInteger;
+
+ public RoomJoinRulesEventContent JoinRules { get; set; } = new() {
+ JoinRule = RoomJoinRulesEventContent.JoinRules.Public
+ };
+
+ public RoomHistoryVisibilityEventContent HistoryVisibility { get; set; } = new() {
+ HistoryVisibility = RoomHistoryVisibilityEventContent.HistoryVisibilityTypes.Shared
+ };
+
+ /// <summary>
+ /// State events to be sent *before* room access is configured. Keep this small!
+ /// </summary>
+ public List<StateEvent> ImportantState { get; set; } = [];
+
+ /// <summary>
+ /// State events to be sent *after* room access is configured, but before invites are sent.
+ /// </summary>
+ public List<StateEvent> InitialState { get; set; } = [];
+
+ /// <summary>
+ /// Users to invite, with optional reason
+ /// </summary>
+ public Dictionary<string, string?> Invites { get; set; } = new();
+
+ public RoomPowerLevelEventContent PowerLevels { get; init; } = new() {
+ EventsDefault = 0,
+ UsersDefault = 0,
+ Kick = 50,
+ Invite = 50,
+ Ban = 50,
+ Redact = 50,
+ StateDefault = 50,
+ NotificationsPl = new() {
+ Room = 50
+ },
+ Users = [],
+ Events = new Dictionary<string, long> {
+ { RoomAvatarEventContent.EventId, 50 },
+ { RoomCanonicalAliasEventContent.EventId, 50 },
+ { RoomEncryptionEventContent.EventId, 100 },
+ { RoomHistoryVisibilityEventContent.EventId, 100 },
+ { RoomNameEventContent.EventId, 50 },
+ { RoomPowerLevelEventContent.EventId, 100 },
+ { RoomServerAclEventContent.EventId, 100 },
+ { RoomTombstoneEventContent.EventId, 100 },
+ { RoomPolicyServerEventContent.EventId, 100 }
+ }
+ };
+
+ public async Task<GenericRoom> Create(AuthenticatedHomeserverGeneric homeserver) {
+ var crq = new CreateRoomRequest() {
+ PowerLevelContentOverride = new() {
+ EventsDefault = 1000000,
+ UsersDefault = 1000000,
+ Kick = 1000000,
+ Invite = 1000000,
+ Ban = 1000000,
+ Redact = 1000000,
+ StateDefault = 1000000,
+ NotificationsPl = new() {
+ Room = 1000000
+ },
+ Users = new Dictionary<string, long>() {
+ { homeserver.WhoAmI.UserId, MatrixConstants.MaxSafeJsonInteger }
+ },
+ Events = new Dictionary<string, long> {
+ { RoomAvatarEventContent.EventId, 1000000 },
+ { RoomCanonicalAliasEventContent.EventId, 1000000 },
+ { RoomEncryptionEventContent.EventId, 1000000 },
+ { RoomHistoryVisibilityEventContent.EventId, 1000000 },
+ { RoomNameEventContent.EventId, 1000000 },
+ { RoomPowerLevelEventContent.EventId, 1000000 },
+ { RoomServerAclEventContent.EventId, 1000000 },
+ { RoomTombstoneEventContent.EventId, 1000000 },
+ { RoomPolicyServerEventContent.EventId, 1000000 }
+ }
+ },
+ Visibility = "private",
+ RoomVersion = Version
+ };
+
+ if (!string.IsNullOrWhiteSpace(Type))
+ crq.CreationContent.Add("type", Type);
+
+ if (!IsFederatable)
+ crq.CreationContent.Add("m.federate", false);
+
+ var room = await homeserver.CreateRoom(crq);
+
+ await SetBasicRoomInfoAsync(room);
+ await SetStatesAsync(room, ImportantState);
+ await SetAccessAsync(room);
+ await SetStatesAsync(room, InitialState);
+ await SendInvites(room);
+
+ return room;
+ }
+
+ private async Task SendInvites(GenericRoom room) {
+ if (Invites.Count == 0) return;
+
+ var inviteTasks = Invites.Select(async kvp => {
+ try {
+ await room.InviteUserAsync(kvp.Key, kvp.Value);
+ }
+ catch (MatrixException e) {
+ Console.Error.WriteLine("Failed to invite {0} to {1}: {2}", kvp.Key, room.RoomId, e.Message);
+ }
+ });
+
+ await Task.WhenAll(inviteTasks);
+ }
+
+ private async Task SetStatesAsync(GenericRoom room, List<StateEvent> state) {
+ foreach (var ev in state) {
+ await (string.IsNullOrWhiteSpace(ev.StateKey)
+ ? room.SendStateEventAsync(ev.Type, ev.RawContent)
+ : room.SendStateEventAsync(ev.Type, ev.StateKey, ev.RawContent));
+ }
+ }
+
+ private async Task SetBasicRoomInfoAsync(GenericRoom room) {
+ if (!string.IsNullOrWhiteSpace(Name.Name))
+ await room.SendStateEventAsync(RoomNameEventContent.EventId, Name);
+
+ if (!string.IsNullOrWhiteSpace(Topic.Topic))
+ await room.SendStateEventAsync(RoomTopicEventContent.EventId, Topic);
+
+ if (!string.IsNullOrWhiteSpace(Avatar.Url))
+ await room.SendStateEventAsync(RoomAvatarEventContent.EventId, Avatar);
+
+ if (!string.IsNullOrWhiteSpace(AliasLocalPart))
+ CanonicalAlias.Alias = $"#{AliasLocalPart}:{room.Homeserver.ServerName}";
+
+ if (!string.IsNullOrWhiteSpace(CanonicalAlias.Alias)) {
+ await room.Homeserver.SetRoomAliasAsync(CanonicalAlias.Alias!, room.RoomId);
+ await room.SendStateEventAsync(RoomCanonicalAliasEventContent.EventId, CanonicalAlias);
+ }
+ }
+
+ private async Task SetAccessAsync(GenericRoom room) {
+ PowerLevels.Users![room.Homeserver.WhoAmI.UserId] = OwnPowerLevel;
+ await room.SendStateEventAsync(RoomPowerLevelEventContent.EventId, PowerLevels);
+
+ if (!string.IsNullOrWhiteSpace(HistoryVisibility.HistoryVisibility))
+ await room.SendStateEventAsync(RoomHistoryVisibilityEventContent.EventId, HistoryVisibility);
+
+ if (!string.IsNullOrWhiteSpace(JoinRules.JoinRuleValue))
+ await room.SendStateEventAsync(RoomJoinRulesEventContent.EventId, JoinRules);
+ }
+}
+
+public class MatrixConstants {
+ public const long MaxSafeJsonInteger = 9007199254740991L; // 2^53 - 1
+}
\ No newline at end of file
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