forked from preichenberger/go-coinbasepro
/
websocket.go
76 lines (65 loc) · 1.62 KB
/
websocket.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
package coinbasepro
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"errors"
"fmt"
"strconv"
"time"
"github.com/gorilla/websocket"
)
func (c *Client) Subscribe(ctx context.Context, auth bool, msg *Message) (*websocket.Conn, error) {
var dialer websocket.Dialer
if c.WsURL == "" {
return nil, errors.New("no websocket url set")
}
var m interface{} = msg
if auth {
var err error
if m, err = c.signMessage(msg); err != nil {
return nil, err
}
}
if conn, _, err := dialer.DialContext(ctx, c.WsURL, nil); err != nil {
return nil, err
} else if err = conn.WriteJSON(m); err != nil {
conn.Close()
return nil, err
} else {
return conn, nil
}
}
func generateSig(message, secret string) (string, error) {
key, err := base64.StdEncoding.DecodeString(secret)
if err != nil {
return "", err
}
signature := hmac.New(sha256.New, key)
_, err = signature.Write([]byte(message))
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(signature.Sum(nil)), nil
}
type signedMessage struct {
Message
Key string `json:"key"`
Passphrase string `json:"passphrase"`
Timestamp string `json:"timestamp"`
Signature string `json:"signature"`
}
func (c *Client) signMessage(msg *Message) (*signedMessage, error) {
method := "GET"
url := "/users/self/verify"
timestamp := strconv.FormatInt(time.Now().Unix(), 10)
sig, err := generateSig(fmt.Sprintf("%s%s%s", timestamp, method, url), c.Secret)
return &signedMessage{
Message: *msg,
Key: c.Key,
Passphrase: c.Passphrase,
Timestamp: strconv.FormatInt(time.Now().Unix(), 10),
Signature: sig,
}, err
}