backspace/docs/systems/websocket.md

WebSocket Protocol Reference

Endpoint: GET /ws (upgrade to WebSocket) Transport: JSON messages over WebSocket Source: packages/server/src/ws/handler.ts, packages/server/src/ws/events.ts

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Auth Flow

1. Client connects to /ws
2. Client sends { type: 'auth', token: '<jwt>' } within 10 seconds
3. Server validates token (rejects deleted users, tokens issued before passwordChangedAt)
4. Server responds with ready event containing full client state
5. Server updates user status to online, broadcasts presence_update to all user's spaces
6. Heartbeat: server pings every 30s (RFC 6455 ping frames), dead connections detected after ~65s

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Client → Server

Messages

type	fields	notes
message_create	channelId, content, replyToId?	SEND_MESSAGES perm
message_edit	messageId, content	author only
message_delete	messageId	author or MANAGE_MESSAGES
typing_start	channelId	5s auto-expire

DM Messages

type	fields	notes
dm_message_create	dmChannelId, content?, attachments?, replyToId?	member
dm_message_edit	messageId, content	author only
dm_message_delete	messageId	author only
dm_typing_start	dmChannelId	5s auto-expire

Reactions (space + DM, auto-detected)

type	fields	notes
reaction_add	messageId, emoji	ADD_REACTIONS perm (space)
reaction_remove	messageId, emoji	own reactions only

Read State

type	fields	notes
channel_ack	channelId, messageId	mark read up to message
mark_unread	channelId, messageId	'0' to clear all

Presence & Activity

type	fields	notes
presence_update	status: online/idle/dnd	persisted to DB
activity_update	activities: Activity[]	rate-limited 3s, respects showActivity

Voice (Space Channels)

type	fields	notes
voice_join	channelId	one room per user enforced
voice_leave	—
voice_status	isMuted, isDeafened, isCameraOn, isScreenSharing	server enforces space/permission mute

Voice Moderation

type	fields	permission
voice_space_mute	userId, muted	MUTE_MEMBERS
voice_space_deafen	userId, deafened	DEAFEN_MEMBERS
voice_move	userId, targetChannelId	MOVE_MEMBERS
voice_disconnect	userId	DISCONNECT_MEMBERS

DM Calls

type	fields	notes
dm_call_start	dmChannelId	60s auto-timeout if not accepted
dm_call_accept	dmChannelId	ringing→active
dm_call_reject	dmChannelId
dm_call_end	dmChannelId

System

type	fields
auth	token
ping	— (gets pong)

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Server → Client

System

type	fields	scope
ready	(see Ready Payload below)	user
pong	—	user
error	message	user

Messages

type	fields	scope
message_created	message: MessageWithUser	channel (VIEW_CHANNEL)
message_updated	message: MessageWithUser	channel
message_deleted	messageId, channelId	channel
typing	channelId, userId, username	channel (excludes sender)
reaction_added	messageId, reaction (includes user)	channel
reaction_removed	messageId, userId, emoji	channel
embeds_resolved	messageId, channelId, embeds[]	channel

DM Messages

type	fields	scope
dm_message_created	message: DmMessageWithUser	DM members
dm_message_updated	message: DmMessageWithUser	DM members
dm_message_deleted	messageId, dmChannelId	DM members
dm_typing	dmChannelId, userId, username	DM members (excludes sender)
dm_typing_stop	dmChannelId, userId	DM members (excludes typer)
dm_embeds_resolved	messageId, dmChannelId, embeds[]	DM members

Read State

type	fields	scope
channel_ack	channelId, messageId	user (multi-tab sync)
mark_unread	channelId, messageId	user (multi-tab sync)

Presence & Activity

type	fields	scope
presence_update	userId, status, activities?	space (all members)
user_updated	user	user

Space / Channel Management

type	fields	scope
space_updated	space	space
member_joined	spaceId, member: MemberWithUser	space
member_left	spaceId, userId	space
member_banned	spaceId, reason	user (banned)
channel_created	channel, spaceId	space
channel_updated	channel, spaceId	space
channel_deleted	channelId, spaceId	space
category_created	category, spaceId	space
category_updated	category, spaceId	space
category_deleted	categoryId, spaceId	space
channel_layout_updated	spaceId, channels[], categories[]	space
space_layout_updated	layout[], folders[], updatedAt?	user

DM Channel Management

type	fields	scope
dm_channel_created	dmChannel	user
dm_channel_closed	dmChannelId	user
dm_member_added	dmChannelId, user	DM members
dm_member_removed	dmChannelId, userId	DM members
dm_owner_updated	dmChannelId, newOwnerId	DM members

Voice

type	fields	scope
voice_state_update	channelId, userId, action: join/leave	space
voice_status_update	userId, channelId, isMuted, isDeafened, isCameraOn, isScreenSharing	room
voice_space_muted	userId, channelId, spaceId, muted	space
voice_space_deafened	userId, channelId, spaceId, deafened	space
voice_permission_muted	userId, spaceId, muted	space
voice_moved	userId, oldChannelId, newChannelId	user (target)
voice_disconnected	userId, channelId, reason?	user (target)
reason: 'displaced' (new tab)	'session_closed'

DM Calls

type	fields	scope
dm_call_incoming	dmChannelId, callerId, callerName, livekitUrl?, livekitToken?	DM members (excludes caller). Federation fields present for cross-instance calls.
dm_call_accepted	dmChannelId	DM members
dm_call_rejected	dmChannelId	DM members
dm_call_ended	dmChannelId	DM members

Social

type	fields	scope
friend_request_received	request	user (target)
friend_request_accepted	friend, requestId	user (requester)
friend_request_declined	requestId, userId	user (requester)
friend_request_cancelled	requestId, userId	user (target)
friend_removed	userId	user

Discovery

type	fields	scope
join_request_received	request	space (managers)
join_request_accepted	request, space	user (requester)
join_request_declined	request	user (requester)

Federation

type	fields	scope
federation_file_rejected	messageId, dmChannelId, attachmentId, affectedUsers[]	DM members

S2S relay-only event (not a direct client WS event):

read_state_update — sent peer-to-peer via the federation relay when a user acknowledges a DM channel on one instance. The receiving instance processes it, upserts the read_states row, and then emits a standard channel_ack event to the user's local WebSocket connections. The relay event itself is never forwarded to clients directly.

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Ready Payload

{
  type: 'ready',
  user: User,
  spaces: SpaceWithChannelsAndMembers[],
  dmChannels: DmChannel[],
  folders?: SpaceFolder[],
  spaceLayout?: SpaceLayoutItem[] | null,
  layoutUpdatedAt?: number,
  voiceStates?: Record<channelId, userId[]>,
  voiceUserStates?: Record<string, { isMuted, isDeafened, isCameraOn, isScreenSharing }>,
  spaceVoiceStates?: Record<string, { spaceMuted, spaceDeafened, permissionMuted }>,
  readStates?: ReadState[],
  activeCalls?: ActiveCallInfo[],  // includes federatedCallHost?, livekitUrl?, livekitToken? for federated calls
  userActivities?: Record<userId, Activity[]>
}

Federation filtering: When the connecting user is federated (homeInstance is set), the server omits all DM-related data from the ready payload. dmChannels and activeCalls are sent as empty arrays, and readStates is filtered to only include space channel entries. Federated users receive their DM data from their home instance's ready payload instead.