tomato-testing/docs/Group-Chats.md

Group chats.

Note: we assume everyone in the chat trusts each other.

These group chats work by temporarily adding the 4 "closest" people defined by a distance function in group.c in order to form a circle of connected peers. These peers then relay messages to each other.

A friend invites another friend to a group chat by sending them an invite packet. The friend either ignores the invite or responds with a response packet if he wants to join the chat. The friend invite contains the type of groupchat (text only, A/V) the friend is being invited to.

TODO(irungentoo): write more of this.

Protocol

Invite packets: Invite packet: [uint8_t id 96][uint8_t id 0][uint16_t group chat number][33 bytes group chat identifier[1 byte type][32 bytes id]]

Response packet [uint8_t id 96][uint8_t id 1][uint16_t group chat number(local)][uint16_t group chat number to join][33 bytes group chat identifier[1 byte type][32 bytes id]]

Peer online packet: [uint8_t id 97][uint16_t group chat number (local)][33 bytes group chat identifier[1 byte type][32 bytes id]]

Peer leave packet: [uint8_t id 98][uint16_t group chat number][uint8_t id 1]

Peer query packet: [uint8_t id 98][uint16_t group chat number][uint8_t id 8]

Peer response packet: [uint8_t id 98][uint16_t group chat number][uint8_t id 9][Repeated times number of peers: [uint16_t peer num][uint8_t 32bytes real public key][uint8_t 32bytes temp DHT public key][uint8_t name length][name]]

Title response packet: [uint8_t id 98][uint16_t group chat number][uint8_t id 10][title]

Message packets: [uint8_t id 99][uint16_t group chat number][uint16_t peer number][uint32_t message number][uint8_t with a value representing id of message][data]

Lossy Message packets: [uint8_t id 199][uint16_t group chat number][uint16_t peer number][uint16_t message number][uint8_t with a value representing id of message][data]

Group chat types: 0: text 1: AV

Note: the message number is increased by 1 for each sent message.

message ids: 0 - ping sent every ~60 seconds by every peer. No data.

16 - new_peer Tell everyone about a new peer in the chat. [uint16_t peer_num][uint8_t 32bytes real public key][uint8_t 32bytes temp DHT public key]

17 - kill_peer [uint16_t peer_num]

48 - name change [uint8_t name[namelen]]

49 - groupchat title change [uint8_t title[titlelen]]

64 - chat message [uint8_t message[messagelen]]

65 - action (/me) [uint8_t message[messagelen]]