forked from maicoin/max-exchange-api-go
/
auth_middleware.go
75 lines (64 loc) · 1.95 KB
/
auth_middleware.go
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// Copyright 2018 MaiCoin Technologies
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package max
import (
"bytes"
"encoding/base64"
"encoding/json"
"io/ioutil"
"net/http"
"time"
)
const (
HeaderAccessKey = "X-MAX-ACCESSKEY"
HeaderPayloadKey = "X-MAX-PAYLOAD"
HeaderSignature = "X-MAX-SIGNATURE"
)
func newAuthMiddleware(accessKey, secretKey string, getTimeDiff func() time.Duration) middleware {
return func(n http.RoundTripper) http.RoundTripper {
return authMiddleware{
accessKey: accessKey,
secretKey: secretKey,
getTimeDiff: getTimeDiff,
next: n,
}
}
}
type authMiddleware struct {
accessKey string
secretKey string
getTimeDiff func() time.Duration
next http.RoundTripper
}
func (m authMiddleware) RoundTrip(req *http.Request) (*http.Response, error) {
params := make(map[string]interface{})
params["path"] = req.URL.Path
params["nonce"] = nonce(m.getTimeDiff())
if req.Body != nil {
err := json.NewDecoder(req.Body).Decode(¶ms)
if err != nil {
return nil, err
}
}
body, _ := json.Marshal(params)
req.Body = ioutil.NopCloser(bytes.NewBuffer(body))
payload := base64.StdEncoding.EncodeToString(body)
// Write auth headers
req.Header.Set(HeaderAccessKey, m.accessKey)
req.Header.Set(HeaderPayloadKey, payload)
req.Header.Set(HeaderSignature, signPayload([]byte(m.secretKey), []byte(payload)))
req.RequestURI = req.URL.Path
req.ContentLength = int64(len(body))
return m.next.RoundTrip(req)
}