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Group chats.
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Note: we assume everyone in the chat trusts each other.
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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.
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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.
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TODO: write more of this.
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## Protocol
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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:
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[uint8_t id 97][uint16_t group chat number (local)][33 bytes group chat identifier[1 byte type][32 bytes id]]
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Peer leave packet:
[uint8_t id 98][uint16_t group chat number][uint8_t id 1]
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Peer query packet:
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[uint8_t id 98][uint16_t group chat number][uint8_t id 8]
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Peer response packet:
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[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]]
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Title response packet:
[uint8_t id 98][uint16_t group chat number][uint8_t id 10][title]
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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]
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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
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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.
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[uint16_t peer_num][uint8_t 32bytes real public key][uint8_t 32bytes temp DHT public key]
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17 - kill_peer
[uint16_t peer_num]
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48 - name change
[uint8_t name[namelen]]
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49 - groupchat title change
[uint8_t title[titlelen]]
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64 - chat message
[uint8_t message[messagelen]]
65 - action (/me)
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[uint8_t message[messagelen]]
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