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# Waffle API docs
# Gateway
Waffle uses a WebSocket gateway to transmit various updates from the server to the client and vice-versa (new message, user disconnecting, connect to voice, etc.)
# Gateway Payload format
All payloads sent through the gateway are *string payloads*. They all start with a number represeting the "instruction", followed by a "@" character (to delimit the instruction number from the rest of the payload), after which comes the data for the specific instruction.
Example packet:
```json
23@this is my payload data
```
Note for the example above: The "this is my payload data" text should not be user controlled. If user controlled input is required, it must be sanitized and/or passed as a JSON field.
Packets can also have JSON as a payload:
```json
32@{"name":"Alice"}
```
## Instructions
## 0:HELLO
*Part of handshake, Server to client*
Sent by the server to the client as soon as possible after they connect to the gateway.
This payload contains a `pingInterval` property. Every *pingInterval*, the client must send a packet simply containing `7@1`. This is the ACTION_PING payload. If the client does not send this payload at the right time, it is disconnected.
Example:
```json
0@{"pingInterval":14750}
```
## 1:YOO
*Part of handshake, Client to server*
Sent by the client as soon as possible after receiving the HELLO instruction.
JSON data format:
| Field | Description |
| - | - |
| token | The authentication token |
Example:
```json
1@{"token":"my totally real token"}
```
If the token is invalid, or the connection is otherwise rejected, the client should be disconnected as soon as possible, and no YOO\_ACK should be sent.
## 2:YOO\_ACK
*Part of handshake, Server to client*
Sent by the server as soon as possible after processing the YOO payload from the client.
JSON data format:
| Field | Description |
| - | - |
| user | A [message author object](#message-author-object) |
| session_id | A UUIDv4 |
| channels | An array of [channels](#channel-object) |
Example:
```json
2@{}
```
## 3:ACTION\_CREATE\_MESSAGE
*Auth required, Client to server*
Sent by the client when sending a message.
JSON data format:
| Field | Description |
| - | - |
| content | The text content of the message |
| channel | An object that contains "_id", the id of the channel to send the message to |
Example:
```json
3@{"content":"i hate you","channel":{"_id":"totally real channel id"}}
```
## 4:EVENT\_NEW\_MESSAGE
*Auth required, Server to client*
Sent by the server when a new message is created in a channel the client is subscribed to.
JSON data format:
[Message object](#message-object)
## 5:ACTION\_UPDATE\_STATUS
*Auth required, Client to server*
Sent by the client when updating status. Usually, this packet is sent as soon as possible after getting YOO\_ACK to indicate the client is online.
JSON data format:
| Field | Description |
| - | - |
| status | Can be 0(STATUS\_OFFLINE) or 1(STATUS\_ONLINE) |
| status_text | Custom status text, max 50 characters, min 1 non-whitespace character, trimmed |
Example:
```json
5@{"status":1,"status_text":"hello"}
```
## 6:EVENT\_CHANNEL\_MEMBERS
*Auth required, Server to client*
An object containing a list of user presences which were updated, where the keys are the user ids and the values are [user presence objects](#user-presence-object).
Example:
```json
6@{"userid":{_id:"userid",username:"username123",status:1,status_text:"hello"}}
```
## 7:ACTION_PING
*Auth required, Client to server*
Sent by the client every `pingInterval`. The payload of this packet must always be `1`.
Example:
```json
7@1
```
## 21:ACTION_VOICE_REQUEST_SESSION
*Auth required, Client to server*
Sent by the client whenever it wants to initiate a voice session in a specific channel.
JSON data format:
| Field | Description |
| - | - |
| channel | An object that contains "_id", the id of the channel to connect to |
## 22:EVENT_VOICE_ASSIGN_SERVER
*Auth required, Server to client*
Sent by the server when a voice server has been assigned to a channel session.
JSON data format:
| Field | Description |
| - | - |
| reportTo | The IP and port of the voice server to connect to |
| channel | An object that contains "_id", the id of the channel |
# Voice server gateway
Voice server signaling is done through a websocket gateway. This gateway is specified by the `reportTo` property in EVENT_VOICE_ASSIGN_SERVER.
## 23:ACTION_VOICE_CONNECTION_REQUEST
*Client to server*
| Field | Description |
| - | - |
| token | The authentication token |
| channel | An object that contains "_id", the id of the channel to connect to |
| offer | An SDP payload; the webrtc offer from the client |
## 24:EVENT_VOICE_CONNECTION_ANSWER
*Auth required, Server to client*
| Field | Description |
| - | - |
| session_id | A UUIDv4 |
| answer | An SDP payload; the webrtc answer from the server |
# Objects and data types
## Message object
| Field | Description |
| - | - |
| content | The text content of the message (max 2000 characters, min 1 character, trimmed) |
| channel | A [message channel object](#message-channel-object) |
| author | A [message author object](#message-author-object) |
| _id | A UUIDv4 |
## Message channel object
Used mostly for messages.
| Field | Description |
| - | - |
| _id | The id of the channel |
| name | The name of the channel |
## Channel object
| Field | Description |
| - | - |
| _id | The id of the channel |
| name | The name of the channel |
| creator | A [user object](#user-object) |
## User object
| Field | Description |
| - | - |
| _id | The id of the user |
| name | The name of the user |
| color | A hex color that represents that user |
## Message author object
Used mostly for messages.
| Field | Description |
| - | - |
| _id | The id of the user |
| name | The name of the user |
## User presence object
| Field | Description |
| - | - |
| _id | The id of the user |
| name | The name of the user |
| status | The status of the user (see ACTION_UPDATE_STATUS) |
| status_text | The text status of the user (see ACTION_UPDATE_STATUS) |