implement room ban

apps/match/src/match.app.ts

@@ -274,6 +274,14 @@ async function enterRoom(c: Context<App>, id: number, roomInstance: RoomInstance
 /** MatchmakingErrorCode.NoSuchRoom — returned when a room isn't in the DB. */
 const NO_SUCH_ROOM = 20
 
+/**
+ * MatchmakingErrorCode for "you are banned from this room". Unlike the opaque
+ * NoSuchRoom every other refusal answers, a banned player is told why: they already
+ * know the room exists, so there's nothing to hide, and the client can say so instead
+ * of showing a room that mysteriously fails to load.
+ */
+const BANNED_FROM_ROOM = 55
+
 /** The notifications hub is a single global DO instance (see the `notify` worker). */
 const HUB_INSTANCE = 'global'
 
@@ -477,11 +485,20 @@ async function inviteParty(
 	)
 }
 
+/**
+ * The outcome of resolving a room to join: the instance, or the `errorCode` to answer
+ * with. Kept as a pair rather than a bare null so callers can tell a room that isn't
+ * there (NoSuchRoom) from one the caller is banned from — those answer different codes.
+ */
+type ResolvedInstance =
+	| { instance: RoomInstance; errorCode: 0 }
+	| { instance: null; errorCode: number }
+
 /**
  * Resolve a room by `:room` path segment (numeric id or name) from D1, then find a
  * joinable instance of it (public matchmakes reuse one via the `room_instance`
- * table) or create a new one. Returns null when the room isn't found, or when the
- * caller is banned from it.
+ * table) or create a new one. A null instance carries the error code to answer:
+ * NoSuchRoom when the room isn't in the DB, BannedFromRoom when the caller is banned.
  */
 async function resolveRoomInstance(
 	c: Context<App>,
@@ -489,23 +506,22 @@ async function resolveRoomInstance(
 	isPrivate: boolean,
 	ownerId: number,
 	subRoomId?: number
-): Promise<RoomInstance | null> {
+): Promise<ResolvedInstance> {
 	const id = Number.parseInt(roomKey, 10)
 	const room = Number.isNaN(id)
 		? await getRoomByName(c.env.DB, roomKey)
 		: await getRoomById(c.env.DB, id)
-	if (!room) return null
+	if (!room) return { instance: null, errorCode: NO_SUCH_ROOM }
 
 	const f = instanceFieldsFromRoom(room, subRoomId)
 
 	// A banned player never gets an instance. This is the whole enforcement of a room
 	// ban: the Photon room id only ever reaches a player through a matchmake, so
 	// refusing here means they have no coordinates to join or interact with. Handled
-	// before any instance is created or reused so a ban can't spawn one. The caller sees
-	// the same opaque NO_SUCH_ROOM every other refusal answers.
+	// before any instance is created or reused so a ban can't spawn one.
 	if (await isPlayerBannedFromRoom(c.env.DB, f.roomId, ownerId)) {
 		logger.info('matchmake refused: player banned from room', { roomId: f.roomId, ownerId })
-		return null
+		return { instance: null, errorCode: BANNED_FROM_ROOM }
 	}
 
 	// Never place the player back into the instance they're already in: the client
@@ -538,13 +554,16 @@ async function resolveRoomInstance(
 			roomInstanceType: f.roomInstanceType,
 		})
 	}
-	return roomInstanceFromRoom(
-		room,
-		isPrivate,
-		instance.roomInstanceId,
-		instance.photonRoomId,
-		f.subRoomId
-	)
+	return {
+		instance: roomInstanceFromRoom(
+			room,
+			isPrivate,
+			instance.roomInstanceId,
+			instance.photonRoomId,
+			f.subRoomId
+		),
+		errorCode: 0,
+	}
 }
 
 /**
@@ -872,7 +891,8 @@ const app = new Hono<App>()
 			description: [
 				'Looks the club up, checks the caller is a member of it, and places them into an',
 				'instance of its clubhouse room. Returns errorCode 20 with a null instance when the',
-				'club is unknown, has no clubhouse set, or the caller isn’t a member.',
+				'club is unknown, has no clubhouse set, or the caller isn’t a member — and errorCode',
+				'55 when they are banned from the clubhouse room.',
 			].join(' '),
 			security: AUTHED,
 			requestBody: form(JoinModeRequest, 'Optional JoinMode'),
@@ -888,7 +908,7 @@ const app = new Hono<App>()
 			responses: {
 				200: json(
 					MatchmakeResponse,
-					'The clubhouse instance (or errorCode 20 with null when it can’t be entered)'
+					'The clubhouse instance (or a null instance with errorCode 20 / 55 when it can’t be entered)'
 				),
 				401: UNAUTHORIZED_RESPONSE,
 			},
@@ -908,13 +928,13 @@ const app = new Hono<App>()
 			}
 
 			const joinMode = await readJoinMode(c)
-			const instance = await resolveRoomInstance(
+			const { instance, errorCode } = await resolveRoomInstance(
 				c,
 				String(club.clubhouseRoomId),
 				joinMode === 2,
 				id
 			)
-			if (!instance) return c.json({ errorCode: NO_SUCH_ROOM, roomInstance: null })
+			if (!instance) return c.json({ errorCode, roomInstance: null })
 			await enterRoom(c, id, instance)
 			return c.json({ errorCode: 0, roomInstance: instance })
 		}
@@ -938,7 +958,9 @@ const app = new Hono<App>()
 				'from the target’s stored presence. FRIENDS ONLY: the caller must be a mutual friend',
 				'of the target (otherwise anyone could read a player’s presence and warp to them).',
 				'Returns errorCode 20 with a null instance when the target isn’t a friend, is the',
-				'caller themselves, or isn’t currently in a room.',
+				'caller themselves, or isn’t currently in a room, and errorCode 55 when the caller is',
+				'banned from the room the friend is in — this path hands out join coordinates without',
+				'going through the room resolver, so it carries its own ban check.',
 			].join(' '),
 			security: AUTHED,
 			parameters: [
@@ -953,7 +975,7 @@ const app = new Hono<App>()
 			responses: {
 				200: json(
 					MatchmakeResponse,
-					'The friend’s instance (or errorCode 20 with null when it can’t be joined)'
+					'The friend’s instance (or a null instance with errorCode 20 / 55 when it can’t be joined)'
 				),
 				401: UNAUTHORIZED_RESPONSE,
 			},
@@ -979,7 +1001,7 @@ const app = new Hono<App>()
 			// otherwise following a friend in is a way around a ban.
 			if (await isPlayerBannedFromRoom(c.env.DB, instance.roomId, id)) {
 				logger.info('follow refused: player banned from room', { roomId: instance.roomId, id })
-				return c.json({ errorCode: NO_SUCH_ROOM, roomInstance: null })
+				return c.json({ errorCode: BANNED_FROM_ROOM, roomInstance: null })
 			}
 
 			// Join that same instance (same id + Photon room) and store it as the caller's
@@ -1015,7 +1037,10 @@ const app = new Hono<App>()
 				},
 			],
 			responses: {
-				200: json(MatchmakeResponse, 'The instance (or errorCode 20 with null on unknown room)'),
+				200: json(
+					MatchmakeResponse,
+					'The instance (or a null instance with errorCode 20 on an unknown room, 55 when banned)'
+				),
 				401: UNAUTHORIZED_RESPONSE,
 			},
 		}),
@@ -1024,14 +1049,14 @@ const app = new Hono<App>()
 			if (id === null) return unauthorized(c)
 			const { joinMode, additionalPlayerIds } = await readMatchmakeBody(c)
 			const subRoomId = Number.parseInt(c.req.param('subRoomId'), 10)
-			const instance = await resolveRoomInstance(
+			const { instance, errorCode } = await resolveRoomInstance(
 				c,
 				c.req.param('roomId'),
 				joinMode === 2,
 				id,
 				subRoomId
 			)
-			if (!instance) return c.json({ errorCode: NO_SUCH_ROOM, roomInstance: null })
+			if (!instance) return c.json({ errorCode, roomInstance: null })
 			await enterRoom(c, id, instance)
 			// Pull the caller's party (AdditionalPlayerIds) into the instance they landed in.
 			await inviteParty(c, id, additionalPlayerIds, instance)
@@ -1054,7 +1079,10 @@ const app = new Hono<App>()
 			requestBody: form(MatchmakeRoomRequest, 'Optional JoinMode and AdditionalPlayerIds'),
 			parameters: [{ name: 'roomId', in: 'path', required: true, schema: { type: 'string' } }],
 			responses: {
-				200: json(MatchmakeResponse, 'The instance (or errorCode 20 with null on unknown room)'),
+				200: json(
+					MatchmakeResponse,
+					'The instance (or a null instance with errorCode 20 on an unknown room, 55 when banned)'
+				),
 				401: UNAUTHORIZED_RESPONSE,
 			},
 		}),
@@ -1062,8 +1090,13 @@ const app = new Hono<App>()
 			const id = await authedId(c)
 			if (id === null) return unauthorized(c)
 			const { joinMode, additionalPlayerIds } = await readMatchmakeBody(c)
-			const instance = await resolveRoomInstance(c, c.req.param('roomId'), joinMode === 2, id)
-			if (!instance) return c.json({ errorCode: NO_SUCH_ROOM, roomInstance: null })
+			const { instance, errorCode } = await resolveRoomInstance(
+				c,
+				c.req.param('roomId'),
+				joinMode === 2,
+				id
+			)
+			if (!instance) return c.json({ errorCode, roomInstance: null })
 			await enterRoom(c, id, instance)
 			// Pull the caller's party (AdditionalPlayerIds) into the instance they landed in.
 			await inviteParty(c, id, additionalPlayerIds, instance)

apps/match/src/openapi.ts

@@ -128,7 +128,9 @@ export const PlayerDto = z.object({
  * a non-zero code (e.g. 20 NoSuchRoom) comes with `roomInstance: null`.
  */
 export const MatchmakeResponse = z.object({
-	errorCode: z.int().describe('0 = success; 20 = NoSuchRoom'),
+	errorCode: z
+		.int()
+		.describe('0 = success; 20 = NoSuchRoom; 55 = banned from the room (the one non-opaque code)'),
 	roomInstance: RoomInstanceDto.nullable(),
 })
 

apps/match/src/test/integration/api.test.ts

@@ -1251,7 +1251,7 @@ describe('auth-gated endpoints', () => {
 		).run()
 		try {
 			expect(await (await follow(9801, '9800')).json()).toEqual({
-				errorCode: 20,
+				errorCode: 55,
 				roomInstance: null,
 			})
 		} finally {
@@ -1278,14 +1278,15 @@ describe('auth-gated endpoints', () => {
 		).run()
 
 		// The ban is the whole enforcement: no instance means no Photon room id, so there
-		// is nothing for the banned player to join. Same opaque NoSuchRoom as any other
-		// refusal, and it applies to the subroom path as well.
-		expect(await matchmake('9701')).toEqual({ errorCode: 20, roomInstance: null })
+		// is nothing for the banned player to join. errorCode 55 rather than the opaque
+		// NoSuchRoom every other refusal answers — a banned player already knows the room
+		// exists, so the client can say why. Applies to the subroom path as well.
+		expect(await matchmake('9701')).toEqual({ errorCode: 55, roomInstance: null })
 		const sub = await exports.default.fetch(`${ORIGIN}/matchmake/room/2/2`, {
 			method: 'POST',
 			headers: await bearer('9701'),
 		})
-		expect(await sub.json()).toEqual({ errorCode: 20, roomInstance: null })
+		expect(await sub.json()).toEqual({ errorCode: 55, roomInstance: null })
 
 		// Refused before any instance is created, and no presence was recorded for them.
 		expect(

apps/rooms/src/openapi.ts

@@ -462,6 +462,17 @@ export const RoomBanDto = z.object({
 	CreatedAt: z.string(),
 })
 
+/**
+ * One entry of `GET /rooms/{roomId}/bans` — the client's ban-list shape. camelCase and
+ * a different field set from the {@link RoomBanDto} the write answers: no room id (the
+ * path already says which room) and no ban mask.
+ */
+export const RoomBanEntryDto = z.object({
+	accountId: z.int().describe('The banned player'),
+	bannedByAccountId: z.int().describe('Who issued the ban'),
+	banStartTime: z.string().describe('ISO 8601 UTC, when the ban was issued'),
+})
+
 /** The envelope the ban write answers — same shape as the room writes, `value` is the ban. */
 export const RoomBanEnvelope = z.object({
 	success: z.boolean(),

apps/rooms/src/rooms.app.ts

@@ -22,6 +22,7 @@ import {
 	getPresence,
 	getPublicRoomsByCreator,
 	getRecommendedRooms,
+	getRoomBans,
 	getRoomById,
 	getRoomByName,
 	getRoomsByCreator,
@@ -83,6 +84,7 @@ import {
 	RestrictionsRequest,
 	RoleRequest,
 	RoomBanEnvelope,
+	RoomBanEntryDto,
 	RoomDto,
 	RoomEnvelope,
 	roomIdParam,
@@ -375,19 +377,56 @@ async function pushRoomUpdate(
 }
 
 /**
- * Tell a player they've been banned from a room — a `ModerationRoomBan` push carrying
- * the ban. Like {@link pushRoomUpdate}, hub failures are logged and swallowed: the ban
- * row has already committed, so a hub hiccup must not fail the request.
+ * `reportCategory` on a moderation frame. -1 is "Moderator" — the category for an
+ * action a person took rather than one the system inferred, which is what a room ban
+ * is. The rest of the enum, for reference: 2 Harassment, 3 Cheating, 5 AFK, 6 Misc,
+ * 7 Underage, 10 VoteKick, 100–104 CoC_*, 200 InappropriateClothing.
  */
-async function pushRoomBan(c: Context<App>, ban: RoomBan): Promise<void> {
+const REPORT_CATEGORY_MODERATOR = -1
+
+/**
+ * Eject a player from the room they're in — a `ModerationKick` push (id 22), the frame
+ * the client acts on to remove someone. Sent on a ban: the row keeps them out of future
+ * matchmakes, this gets them out of the instance they're in right now.
+ *
+ * The payload is the client's moderation shape, camelCase, in wire order:
+ * `reportCategory`, `duration`, `gameSessionId`, `isHostKick`, `message`,
+ * `playerIdReporter`, `isBan`, `isVoiceModAutoban`. `duration` is 0 (a room ban has no
+ * expiry — it's lifted by DELETE, not by time) and `gameSessionId` is 0 (nothing here
+ * tracks one).
+ *
+ * `isHostKick` says the room's HOST ejected the player, as opposed to the room
+ * majority vote-kicking them. There is no vote-kick path yet, so the only false case
+ * here is a staff moderator acting in a room they don't host. `playerIdReporter` is
+ * whoever caused it — the host today, and the player who started the vote once
+ * vote-kicks exist (those will carry `reportCategory` 10 and `isHostKick` false).
+ *
+ * Like {@link pushRoomUpdate}, hub failures are logged and swallowed: the ban row has
+ * already committed, so a hub hiccup must not fail the request.
+ */
+async function pushRoomBan(
+	c: Context<App>,
+	ban: RoomBan,
+	roomName: string,
+	isHostKick: boolean
+): Promise<void> {
 	try {
 		await c.env.RECFLARE_NOTIFICATIONS_HUB.getByName(HUB_INSTANCE).notifyPlayer(
 			ban.BannedPlayerId,
-			NotificationType.ModerationRoomBan,
-			{ ...ban }
+			NotificationType.ModerationKick,
+			{
+				reportCategory: REPORT_CATEGORY_MODERATOR,
+				duration: 0,
+				gameSessionId: 0,
+				isHostKick,
+				message: `You have been banned from ${roomName}.`,
+				playerIdReporter: ban.BannedByAccountId,
+				isBan: true,
+				isVoiceModAutoban: false,
+			}
 		)
 	} catch (err) {
-		logger.error('failed to push ModerationRoomBan notification', {
+		logger.error('failed to push ModerationKick notification', {
 			playerId: ban.BannedPlayerId,
 			error: err instanceof Error ? err.message : String(err),
 		})
@@ -1393,6 +1432,55 @@ const app = new Hono<App>()
 		}
 	)
 
+	// A room's ban list — the owner's view of who they've banned. Same gate as issuing a
+	// ban: a ban list says who a room's owner has had trouble with, so it isn't public.
+	// Answers a BARE array (not the room-write envelope), newest ban first.
+	.get(
+		'/rooms/:roomId{[0-9]+}/bans',
+		describeRoute({
+			tags: ['Room settings'],
+			summary: 'A room’s ban list',
+			description: [
+				'Everyone banned from the room, most recently banned first. Auth-gated, then gated',
+				'exactly like issuing a ban: the room’s creator or a co-owner, or an account whose',
+				'token carries the `developer` / `moderator` role. A ban list says who a room’s',
+				'owner has had trouble with, so it is not public.',
+				'',
+				'A bare array, NOT the `{ success, error, value }` envelope the ban write answers,',
+				'and the entries are camelCase with a different field set: no room id (the path',
+				'already says which room) and no ban mask. An unknown room is an empty list rather',
+				'than an error — it reads the same as a room nobody is banned from.',
+			].join('\n'),
+			security: AUTHED,
+			parameters: [roomIdParam],
+			responses: {
+				200: json(RoomBanEntryDto.array(), 'The room’s bans, newest first'),
+				401: UNAUTHORIZED_RESPONSE,
+				403: FORBIDDEN_RESPONSE,
+			},
+		}),
+		async (c) => {
+			const accountId = await authedAccountId(c)
+			if (accountId === null) return unauthorized(c)
+
+			const roomId = Number.parseInt(c.req.param('roomId'), 10)
+			const room = await getRoomById(c.env.DB, roomId)
+			// No room → nothing banned. Same answer as a room with an empty ban list, so
+			// this doesn't become a way to probe which room ids exist.
+			if (!room) return c.json([])
+			if (!canManageRoom(room, accountId) && !(await isStaff(c))) return c.body(null, 403)
+
+			const bans = await getRoomBans(c.env.DB, roomId)
+			return c.json(
+				bans.map((ban) => ({
+					accountId: ban.BannedPlayerId,
+					bannedByAccountId: ban.BannedByAccountId,
+					banStartTime: ban.CreatedAt,
+				}))
+			)
+		}
+	)
+
 	// Ban a player from a room (form body `id` + `banMask`). Auth-gated (401), then
 	// gated to the room's owner/co-owner OR a staff token (403). One row per
 	// (room, player) — re-banning rewrites it, so the call is idempotent.
@@ -1403,9 +1491,9 @@ const app = new Hono<App>()
 			summary: 'Ban a player from a room',
 			description: [
 				'Records a ban in the `room_ban` table — one row per (room, player), so re-banning',
-				'someone already banned rewrites their row rather than adding a second. Nothing',
-				'enforces the ban yet: matchmaking does not consult this table, so a banned player',
-				'can still join. This is the record only.',
+				'someone already banned rewrites their row rather than adding a second. The row is',
+				'what the `match` worker checks: a banned player’s matchmake into this room is',
+				'refused with errorCode 55 and never gets a Photon room id.',
 				'',
 				'Gated to the room’s creator or a co-owner, OR to any account whose token carries the',
 				'`developer` / `moderator` role — a valid token from anyone else is a 403. Banning',
@@ -1415,8 +1503,16 @@ const app = new Hono<App>()
 				'`banMask` is stored verbatim and nothing interprets it — the client sends `0` and',
 				'what it selects is not known yet. It defaults to 0 when absent.',
 				'',
-				'The BANNED player (not the caller) gets a `ModerationRoomBan` push carrying the ban,',
-				'so their client can act on it; the hub queues it if they are offline.',
+				'The BANNED player (not the caller) gets a `ModerationKick` push (id 22) — the frame',
+				'the client acts on to eject someone — so a ban takes effect immediately rather than',
+				'only at their next matchmake. `isBan` is true, `duration` 0 (a room ban has no',
+				'expiry; it is lifted by DELETE, not by time) and `reportCategory` -1 (Moderator).',
+				'',
+				'`isHostKick` means the room’s HOST ejected them rather than the room majority',
+				'vote-kicking them; with no vote-kick path yet the only false case is a staff',
+				'moderator acting in a room they do not host. `playerIdReporter` is whoever caused',
+				'it — the host today, the player who started the vote once vote-kicks exist. The hub',
+				'queues the frame if they are offline.',
 				'',
 				'Answers the same lowercase `{ success, error, value }` envelope the room writes use,',
 				'but `value` is the BAN, not the room — a ban is not part of the room the client',
@@ -1440,8 +1536,10 @@ const app = new Hono<App>()
 			if (!room) return banEnvelope(c, null, 'This room does not exist!')
 
 			// The room's own owners, or a staffer acting across rooms. Roles are only
-			// looked up when the cheaper room check fails.
-			if (!canManageRoom(room, accountId) && !(await isStaff(c))) return c.body(null, 403)
+			// looked up when the cheaper room check fails. The room's own owner IS the
+			// host, which is what the kick frame's `isHostKick` reports.
+			const isHostKick = canManageRoom(room, accountId)
+			if (!isHostKick && !(await isStaff(c))) return c.body(null, 403)
 
 			const body = (await c.req.parseBody().catch(() => ({}))) as Record<string, unknown>
 			const str = (v: unknown): string => (typeof v === 'string' ? v : '')
@@ -1458,8 +1556,9 @@ const app = new Hono<App>()
 			const banMask = Number.parseInt(str(body.banMask), 10) || 0
 
 			const ban = await banPlayerFromRoom(c.env.DB, roomId, bannedPlayerId, banMask, accountId)
-			// The banned player is told, not the caller — their client acts on the ban.
-			await pushRoomBan(c, ban)
+			// The banned player is told, not the caller — their client acts on the kick.
+			const roomName = typeof room.Name === 'string' ? room.Name : 'this room'
+			await pushRoomBan(c, ban, roomName, isHostKick)
 			return banEnvelope(c, ban)
 		}
 	)

apps/rooms/src/test/integration/api.test.ts

@@ -1006,29 +1006,83 @@ describe('rooms endpoints', () => {
 		expect(await bansOf(2)).toHaveLength(2)
 	})
 
-	it('POST /rooms/:id/bans notifies the banned player', async () => {
-		type Sent = { playerId: number; notificationType: string | number; data: { RoomId: number } }
+	it('POST /rooms/:id/bans kicks the banned player', async () => {
+		type Sent = { playerId: number; notificationType: string | number; data: unknown }
 		const hub = () => env.RECFLARE_NOTIFICATIONS_HUB.getByName('global')
-		await hub().fetch('http://do/all', { method: 'DELETE' })
+		const sentSince = async (): Promise<Sent[]> =>
+			(await (await hub().fetch('http://do/all')).json()) as Sent[]
 
+		// The room's current name, read rather than hardcoded — earlier tests rename it.
+		const { Name } = (await (await SELF.fetch(`${ORIGIN}/rooms/2`)).json()) as { Name: string }
+
+		await hub().fetch('http://do/all', { method: 'DELETE' })
 		expect((await postForm('/rooms/2/bans', { banMask: '0', id: '207' }, '1')).status).toBe(200)
 
-		const sent = (await (await hub().fetch('http://do/all')).json()) as Sent[]
-		// Pushed to the BANNED player, not the caller. Asserted against the enum rather
-		// than a literal — the hub's ids are the notify worker's to change.
-		expect(sent).toEqual([
+		// A ModerationKick (id 22) to the BANNED player, not the caller — it ejects them
+		// from the instance they're in now; the row keeps them out of future matchmakes.
+		// Asserted against the enum rather than a literal: the ids are notify's to change.
+		expect(await sentSince()).toEqual([
 			{
 				playerId: 207,
-				notificationType: NotificationType.ModerationRoomBan,
+				notificationType: NotificationType.ModerationKick,
+				// The client's moderation payload, camelCase, in wire order.
 				data: {
-					RoomId: 2,
-					BannedPlayerId: 207,
-					BanMask: 0,
-					BannedByAccountId: 1,
-					CreatedAt: expect.any(String),
+					reportCategory: -1, // Moderator — a person acted, not the system
+					duration: 0, // a room ban has no expiry
+					gameSessionId: 0,
+					// The host ejected them (as opposed to a room vote-kick, which doesn't
+					// exist yet). Account 1 owns RecCenter, so it hosts it.
+					isHostKick: true,
+					message: `You have been banned from ${Name}.`,
+					playerIdReporter: 1,
+					isBan: true,
+					isVoiceModAutoban: false,
 				},
 			},
 		])
+
+		// A staff moderator doesn't host the room, so it isn't a host kick — and
+		// `playerIdReporter` is still whoever caused it.
+		await hub().fetch('http://do/all', { method: 'DELETE' })
+		expect(
+			(await postForm('/rooms/2/bans', { id: '208' }, '999', ['gameClient', 'moderator'])).status
+		).toBe(200)
+		expect((await sentSince())[0]).toMatchObject({
+			playerId: 208,
+			data: { isHostKick: false, playerIdReporter: 999 },
+		})
+	})
+
+	it('GET /rooms/:id/bans lists the room’s bans, under the same gate', async () => {
+		type Entry = { accountId: number; bannedByAccountId: number; banStartTime: string }
+		const list = async (path: string, sub?: string, roles?: string[]) =>
+			SELF.fetch(`${ORIGIN}${path}`, { headers: sub ? await bearer(sub, roles) : {} })
+
+		// Room 3 is owned by account 1 (it has no bans yet) — ban two players into it.
+		expect((await postForm('/rooms/3/bans', { id: '401' }, '1')).status).toBe(200)
+		expect((await postForm('/rooms/3/bans', { id: '402' }, '1')).status).toBe(200)
+
+		// No token → 401; a valid token with no room role and no staff role → 403.
+		expect((await list('/rooms/3/bans')).status).toBe(401)
+		expect((await list('/rooms/3/bans', '999')).status).toBe(403)
+
+		const res = await list('/rooms/3/bans', '1')
+		expect(res.status).toBe(200)
+		// A bare array in the client's camelCase shape — no room id, no ban mask.
+		const bans = (await res.json()) as Entry[]
+		expect(bans.map((b) => b.accountId).sort((a, b) => a - b)).toEqual([401, 402])
+		expect(bans[0]).toEqual({
+			accountId: expect.any(Number),
+			bannedByAccountId: 1,
+			banStartTime: expect.stringMatching(/^\d{4}-\d{2}-\d{2}T/),
+		})
+
+		// A staffer can read a list for a room they have no role on.
+		expect((await list('/rooms/3/bans', '999', ['gameClient', 'moderator'])).status).toBe(200)
+
+		// An unknown room reads the same as a room with nobody banned — no probing which
+		// room ids exist.
+		expect(await (await list('/rooms/99999/bans', '1')).json()).toEqual([])
 	})
 
 	it('DELETE /rooms/:id/bans/:playerId lifts a ban, under the same gate', async () => {
@@ -2569,6 +2623,7 @@ describe('rooms endpoints', () => {
 			'GET /rooms/visitedby/me',
 			'GET /rooms/visitedby/{playerId}',
 			'GET /rooms/{roomId}',
+			'GET /rooms/{roomId}/bans',
 			'GET /rooms/{roomId}/interactionby/me',
 			'GET /rooms/{roomId}/playerdata/me',
 			'GET /rooms/{roomId}/similar',