91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package internal
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/base64"
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"errors"
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"fmt"
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"net/http"
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"strconv"
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"time"
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)
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const securityTokenHeader = "x-cns-security-token"
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// TokenTransport HTTP transport for API authentication.
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type TokenTransport struct {
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apiKey string
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secretKey string
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// Transport is the underlying HTTP transport to use when making requests.
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// It will default to http.DefaultTransport if nil.
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Transport http.RoundTripper
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}
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// NewTokenTransport Creates an HTTP transport for API authentication.
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func NewTokenTransport(apiKey, secretKey string) (*TokenTransport, error) {
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if apiKey == "" {
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return nil, errors.New("credentials missing: API key")
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}
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if secretKey == "" {
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return nil, errors.New("credentials missing: secret key")
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}
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return &TokenTransport{apiKey: apiKey, secretKey: secretKey}, nil
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}
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// RoundTrip executes a single HTTP transaction.
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func (t *TokenTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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enrichedReq := &http.Request{}
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*enrichedReq = *req
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enrichedReq.Header = make(http.Header, len(req.Header))
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for k, s := range req.Header {
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enrichedReq.Header[k] = append([]string(nil), s...)
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}
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if t.apiKey != "" && t.secretKey != "" {
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securityToken := createCnsSecurityToken(t.apiKey, t.secretKey)
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enrichedReq.Header.Set(securityTokenHeader, securityToken)
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}
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return t.transport().RoundTrip(enrichedReq)
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}
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func (t *TokenTransport) transport() http.RoundTripper {
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if t.Transport != nil {
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return t.Transport
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}
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return http.DefaultTransport
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}
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// Client Creates a new HTTP client.
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func (t *TokenTransport) Client() *http.Client {
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return &http.Client{Transport: t}
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}
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// Wrap wraps an HTTP client Transport with the TokenTransport.
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func (t *TokenTransport) Wrap(client *http.Client) *http.Client {
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backup := client.Transport
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t.Transport = backup
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client.Transport = t
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return client
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}
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func createCnsSecurityToken(apiKey, secretKey string) string {
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timestamp := time.Now().Round(time.Millisecond).UnixNano() / int64(time.Millisecond)
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hm := encodedHmac(timestamp, secretKey)
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requestDate := strconv.FormatInt(timestamp, 10)
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return fmt.Sprintf("%s:%s:%s", apiKey, hm, requestDate)
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}
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func encodedHmac(message int64, secret string) string {
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h := hmac.New(sha1.New, []byte(secret))
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_, _ = h.Write([]byte(strconv.FormatInt(message, 10)))
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return base64.StdEncoding.EncodeToString(h.Sum(nil))
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}
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