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package discord
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"log"
"math/rand"
"net/http"
"time"
"github.com/gorilla/websocket"
)
const DISCORD_URl = "https://discord.com/api/v9/"
const USER_AGENT = "DiscordBot (https://jinx.rnrd.eu/, v0.0.0) Jinx"
type Discord struct {
Token string
Conn *websocket.Conn
}
func NewClient(token string) *Discord {
return &Discord{
Token: token,
Conn: nil,
}
}
func (d *Discord) Connect(ctx context.Context) error {
gatewayURL, err := d.getGateway()
if err != nil {
return err
}
fmt.Printf("gateway: %s\n", gatewayURL)
connectHeader := http.Header{}
d.Conn, _, err = websocket.DefaultDialer.Dial(gatewayURL, connectHeader)
if err != nil {
return err
}
var helloMsg GatewayPayload[GatewayHelloMsg]
if err = d.Conn.ReadJSON(&helloMsg); err != nil {
return err
}
fmt.Printf("connection response Payload: %+v\n", helloMsg)
if helloMsg.Op != GATEWAY_OP_HELLO {
return fmt.Errorf("expected opcode %d, got %d", GATEWAY_OP_HELLO, helloMsg.Op)
}
go d.startHeartbeat(ctx, helloMsg.Data.HeartbeatInterval)
if err = d.identify(); err != nil {
return err
}
return nil
}
func (d *Discord) Disconnect() error {
if d.Conn == nil {
return errors.New("not connected")
}
return d.Conn.Close()
}
func (d *Discord) getGateway() (string, error) {
url := DISCORD_URl + "gateway"
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return "", err
}
req.Header.Set("Authorization", d.Token)
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", USER_AGENT)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
var buf bytes.Buffer
_, err = buf.ReadFrom(resp.Body)
if err != nil {
return "", err
}
switch resp.StatusCode {
case 200:
default:
return "", errors.New("gateway response status code: " + resp.Status)
}
body := struct {
URL string `json:"url"`
}{}
err = json.Unmarshal(buf.Bytes(), &body)
if err != nil {
return "", err
}
url = body.URL + "?v=9&encoding=json"
return url, nil
}
func (d *Discord) startHeartbeat(ctx context.Context, interval uint64) {
// REF: heartbeat_interval * jitter
jitter := rand.Intn(int(interval))
time.Sleep(time.Duration(jitter) * time.Millisecond)
ticker := time.NewTicker(time.Duration(interval) * time.Millisecond)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
fmt.Println("sending heartbeat.")
msg := GatewayPayload[any]{
Op: GATEWAY_OP_HEARTBEAT,
}
if err := d.Conn.WriteJSON(msg); err != nil {
log.Fatalf("error sending heartbeat: %s\n", err)
}
}
}
}
func (d *Discord) identify() error {
msg := GatewayPayload[GatewayIdentifyMsg]{
Op: GATEWAY_OP_IDENTIFY,
Data: GatewayIdentifyMsg{
Token: d.Token,
Properties: GatewayIdentifyProperties{
OS: "linux",
Browser: "jinx",
Device: "jinx",
},
},
Sequence: 0,
}
if err := d.Conn.WriteJSON(msg); err != nil {
return err
}
var res GatewayPayload[GatewayReadyMsg]
if err := d.Conn.ReadJSON(&res); err != nil {
return err
}
fmt.Printf("identify response payload: %+v\n", res)
if res.Op != GATEWAY_OP_DISPATCH {
return fmt.Errorf("expected opcode %d, got %d", GATEWAY_OP_DISPATCH, res.Op)
}
if res.EventName != "READY" {
return fmt.Errorf("expected event name %s, got %s", "READY", res.EventName)
}
return nil
}
|
