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tangled.org
1package state
2
3import (
4 "crypto/hmac"
5 "crypto/sha256"
6 "encoding/hex"
7 "net/http"
8 "time"
9)
10
11type SignerTransport struct {
12 Secret string
13}
14
15func SignedClient(secret string) *http.Client {
16 return &http.Client{
17 Timeout: 5 * time.Second,
18 Transport: SignerTransport{
19 Secret: secret,
20 },
21 }
22}
23
24func (s SignerTransport) RoundTrip(req *http.Request) (*http.Response, error) {
25 timestamp := time.Now().Format(time.RFC3339)
26 mac := hmac.New(sha256.New, []byte(s.Secret))
27 message := req.Method + req.URL.Path + timestamp
28 mac.Write([]byte(message))
29 signature := hex.EncodeToString(mac.Sum(nil))
30 req.Header.Set("X-Signature", signature)
31 req.Header.Set("X-Timestamp", timestamp)
32 return http.DefaultTransport.RoundTrip(req)
33}