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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]]
```
|
