mirror of
https://github.com/permissionlesstech/bitchat.git
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Private groups: creator-managed encrypted group chat over the mesh
Small encrypted crews (hard cap 16) between public broadcast and 1:1 DMs: Protocol - MessageType.groupMessage = 0x25: broadcast packets with a cleartext 16-byte group ID + epoch, ChaCha20-Poly1305 ciphertext (epoch bound as AEAD AAD), inner Ed25519 sender signature over "bitchat-group-msg-v1"|groupID|messageID|timestamp|content - NoisePayloadType.groupInvite = 0x06 / .groupKeyUpdate = 0x07: creator-signed group state (key, epoch, roster) 1:1 over Noise; signature over "bitchat-group-v1"|groupID|epoch|key-hash|roster-hash and the Noise session peer must BE the creator - SyncTypeFlags bit 10 (groupMessage): variable-length LE bitfield widens 1 -> 2 bytes inside the length-prefixed REQUEST_SYNC TLV; old clients ignore unknown bits and answer with types they know - PeerCapabilities.localSupported now advertises .groups Storage - GroupStore: symmetric keys in the keychain, roster/name/epoch as protected JSON in Application Support; wiped in panicClearAllData() Behavior - Non-members relay 0x25 like any broadcast but cannot read it; group messages join gossip-sync backfill with the public-message window - Receivers drop wrong-epoch envelopes, bad sender signatures, and senders missing from the creator-signed roster - Fire-and-flood delivery (no per-member acks in v1) UI - Groups open as chat windows through the private-chat sheet (virtual "group_" peer IDs); groups section in the people sheet; /group create/invite/remove/leave/list commands; invitees get a system message + notification and the group appears in their people sheet Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jack
@@ -221,6 +221,13 @@ private struct ContentPeopleListView: View {
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}
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)
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} else {
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GroupChatList(
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groups: peerListModel.groupRows,
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onTapGroup: { peerID in
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peerListModel.startConversation(with: peerID)
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showSidebar = true
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}
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)
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MeshPeerList(
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onTapPeer: { peerID in
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peerListModel.startConversation(with: peerID)
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@@ -455,6 +462,10 @@ private struct ContentPrivateChatSheetView: View {
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}
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private var privacyCaptionText: String {
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// Group chats are ChaCha20-Poly1305 sealed to the roster's shared key.
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if privateConversationModel.selectedPeerID?.isGroup == true {
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return String(localized: "content.private.caption_group", comment: "Caption above the group chat composer noting messages are encrypted to group members")
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}
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// Geohash DMs are NIP-17 gift-wrapped — always end-to-end encrypted,
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// even though they carry no Noise session status. Mesh DMs earn the
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// "encrypted" claim only once the Noise handshake has secured.
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@@ -503,30 +514,39 @@ private struct ContentPrivateHeaderInfoButton: View {
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var body: some View {
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Button(action: {
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// A group has no single fingerprint to show.
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guard !headerState.isGroupConversation else { return }
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appChromeModel.showFingerprint(for: headerState.headerPeerID)
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}) {
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HStack(spacing: 6) {
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switch headerState.availability {
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case .bluetoothConnected:
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Image(systemName: "dot.radiowaves.left.and.right")
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if headerState.isGroupConversation {
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Image(systemName: "person.3.fill")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(palette.primary)
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.accessibilityLabel(String(localized: "content.accessibility.connected_mesh", comment: "Accessibility label for mesh-connected peer indicator"))
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case .meshReachable:
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Image(systemName: "point.3.filled.connected.trianglepath.dotted")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(palette.primary)
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.accessibilityLabel(String(localized: "content.accessibility.reachable_mesh", comment: "Accessibility label for mesh-reachable peer indicator"))
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case .nostrAvailable:
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Image(systemName: "globe")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(.purple)
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.accessibilityLabel(String(localized: "content.accessibility.available_nostr", comment: "Accessibility label for Nostr-available peer indicator"))
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case .offline:
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// Absence of a glyph was the only offline signal; say it.
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Text("mesh_peers.state.offline")
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.bitchatFont(size: 11)
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.foregroundColor(palette.secondary)
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.accessibilityLabel(String(localized: "content.accessibility.group_chat", comment: "Accessibility label for the group chat indicator"))
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} else {
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switch headerState.availability {
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case .bluetoothConnected:
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Image(systemName: "dot.radiowaves.left.and.right")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(palette.primary)
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.accessibilityLabel(String(localized: "content.accessibility.connected_mesh", comment: "Accessibility label for mesh-connected peer indicator"))
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case .meshReachable:
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Image(systemName: "point.3.filled.connected.trianglepath.dotted")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(palette.primary)
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.accessibilityLabel(String(localized: "content.accessibility.reachable_mesh", comment: "Accessibility label for mesh-reachable peer indicator"))
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case .nostrAvailable:
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Image(systemName: "globe")
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.font(.bitchatSystem(size: 14))
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.foregroundColor(.purple)
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.accessibilityLabel(String(localized: "content.accessibility.available_nostr", comment: "Accessibility label for Nostr-available peer indicator"))
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case .offline:
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// Absence of a glyph was the only offline signal; say it.
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Text("mesh_peers.state.offline")
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.bitchatFont(size: 11)
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.foregroundColor(palette.secondary)
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}
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}
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Text(headerState.displayName)
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@@ -571,7 +591,9 @@ private struct ContentPrivateHeaderInfoButton: View {
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)
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)
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.accessibilityHint(
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String(localized: "content.accessibility.view_fingerprint_hint", comment: "Accessibility hint for viewing encryption fingerprint")
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headerState.isGroupConversation
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? ""
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: String(localized: "content.accessibility.view_fingerprint_hint", comment: "Accessibility hint for viewing encryption fingerprint")
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)
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.frame(minHeight: headerHeight)
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}
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