bbgo_origin/pkg/exchange/kucoin/kucoinapi/client.go

186 lines
4.4 KiB
Go

package kucoinapi
import (
"bytes"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/c9s/bbgo/pkg/util"
"github.com/pkg/errors"
)
const defaultHTTPTimeout = time.Second * 15
const RestBaseURL = "https://api.kucoin.com/api"
const SandboxRestBaseURL = "https://openapi-sandbox.kucoin.com/api"
type RestClient struct {
BaseURL *url.URL
client *http.Client
Key, Secret, Passphrase string
KeyVersion string
AccountService *AccountService
MarketDataService *MarketDataService
TradeService *TradeService
BulletService *BulletService
}
func NewClient() *RestClient {
u, err := url.Parse(RestBaseURL)
if err != nil {
panic(err)
}
client := &RestClient{
BaseURL: u,
KeyVersion: "2",
client: &http.Client{
Timeout: defaultHTTPTimeout,
},
}
client.AccountService = &AccountService{client: client}
client.MarketDataService = &MarketDataService{client: client}
client.TradeService = &TradeService{client: client}
client.BulletService = &BulletService{client: client}
return client
}
func (c *RestClient) Auth(key, secret, passphrase string) {
c.Key = key
c.Secret = secret
c.Passphrase = passphrase
}
// NewRequest create new API request. Relative url can be provided in refURL.
func (c *RestClient) NewRequest(method, refURL string, params url.Values, body []byte) (*http.Request, error) {
rel, err := url.Parse(refURL)
if err != nil {
return nil, err
}
if params != nil {
rel.RawQuery = params.Encode()
}
pathURL := c.BaseURL.ResolveReference(rel)
return http.NewRequest(method, pathURL.String(), bytes.NewReader(body))
}
// sendRequest sends the request to the API server and handle the response
func (c *RestClient) SendRequest(req *http.Request) (*util.Response, error) {
resp, err := c.client.Do(req)
if err != nil {
return nil, err
}
// newResponse reads the response body and return a new Response object
response, err := util.NewResponse(resp)
if err != nil {
return response, err
}
// Check error, if there is an error, return the ErrorResponse struct type
if response.IsError() {
return response, errors.New(string(response.Body))
}
return response, nil
}
// newAuthenticatedRequest creates new http request for authenticated routes.
func (c *RestClient) NewAuthenticatedRequest(method, refURL string, params url.Values, payload interface{}) (*http.Request, error) {
if len(c.Key) == 0 {
return nil, errors.New("empty api key")
}
if len(c.Secret) == 0 {
return nil, errors.New("empty api secret")
}
rel, err := url.Parse(refURL)
if err != nil {
return nil, err
}
if params != nil {
rel.RawQuery = params.Encode()
}
pathURL := c.BaseURL.ResolveReference(rel)
path := pathURL.Path
if rel.RawQuery != "" {
path += "?" + rel.RawQuery
}
body, err := castPayload(payload)
if err != nil {
return nil, err
}
req, err := http.NewRequest(method, pathURL.String(), bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Accept", "application/json")
// Build authentication headers
c.attachAuthHeaders(req, method, path, body)
return req, nil
}
func (c *RestClient) attachAuthHeaders(req *http.Request, method string, path string, body []byte) {
// Set location to UTC so that it outputs "2020-12-08T09:08:57.715Z"
t := time.Now().In(time.UTC)
// timestamp := t.Format("2006-01-02T15:04:05.999Z07:00")
timestamp := strconv.FormatInt(t.UnixNano()/int64(time.Millisecond), 10)
signKey := timestamp + strings.ToUpper(method) + path + string(body)
signature := sign(c.Secret, signKey)
req.Header.Add("KC-API-KEY", c.Key)
req.Header.Add("KC-API-SIGN", signature)
req.Header.Add("KC-API-TIMESTAMP", timestamp)
req.Header.Add("KC-API-PASSPHRASE", sign(c.Secret, c.Passphrase))
req.Header.Add("KC-API-KEY-VERSION", c.KeyVersion)
}
// sign uses sha256 to sign the payload with the given secret
func sign(secret, payload string) string {
var sig = hmac.New(sha256.New, []byte(secret))
_, err := sig.Write([]byte(payload))
if err != nil {
return ""
}
return base64.StdEncoding.EncodeToString(sig.Sum(nil))
}
func castPayload(payload interface{}) ([]byte, error) {
if payload != nil {
switch v := payload.(type) {
case string:
return []byte(v), nil
case []byte:
return v, nil
default:
body, err := json.Marshal(v)
return body, err
}
}
return nil, nil
}