1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/_nuts/github.com/fabioberger/coinbase-go/api_key_authentication.go b/vendor/_nuts/github.com/fabioberger/coinbase-go/api_key_authentication.go
new file mode 100644
index 0000000..534e2dd
--- /dev/null
+++ b/vendor/_nuts/github.com/fabioberger/coinbase-go/api_key_authentication.go
@@ -0,0 +1,74 @@
+package coinbase
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/hex"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+// ApiKeyAuthentication Struct implements the Authentication interface and takes
+// care of authenticating RPC requests for clients with a Key & Secret pair
+type apiKeyAuthentication struct {
+	Key     string
+	Secret  string
+	BaseUrl string
+	Client  http.Client
+}
+
+// ApiKeyAuthWithEnv instantiates ApiKeyAuthentication with the API key & secret & environment (Live or Sandbox)
+func apiKeyAuthWithEnv(key string, secret string, sandbox bool) *apiKeyAuthentication {
+	baseUrl := "https://api.coinbase.com/v1/" // Live Url
+	
+	// Check if should use sandbox
+	if sandbox {
+		baseUrl = "https://api.sandbox.coinbase.com/v1/" // Sandbox Url
+	}
+	a := apiKeyAuthentication{
+		Key:     key,
+		Secret:  secret,
+		BaseUrl: baseUrl,
+		Client: http.Client{
+			Transport: &http.Transport{
+				Dial: dialTimeout,
+			},
+		},
+	}
+	return &a
+}
+
+// ApiKeyAuth instantiates ApiKeyAuthentication with the API key & secret
+// TODO: Maybe remove this (not sure if it would break backwards compatability)
+func apiKeyAuth(key string, secret string) *apiKeyAuthentication {
+	return apiKeyAuthWithEnv(key, secret, false)
+}
+
+// API Key + Secret authentication requires a request header of the HMAC SHA-256
+// signature of the "message" as well as an incrementing nonce and the API key
+func (a apiKeyAuthentication) authenticate(req *http.Request, endpoint string, params []byte) error {
+
+	nonce := strconv.FormatInt(time.Now().UTC().UnixNano(), 10)
+	message := nonce + endpoint + string(params) //As per Coinbase Documentation
+
+	req.Header.Set("ACCESS_KEY", a.Key)
+
+	h := hmac.New(sha256.New, []byte(a.Secret))
+	h.Write([]byte(message))
+
+	signature := hex.EncodeToString(h.Sum(nil))
+
+	req.Header.Set("ACCESS_SIGNATURE", signature)
+	req.Header.Set("ACCESS_NONCE", nonce)
+
+	return nil
+}
+
+func (a apiKeyAuthentication) getBaseUrl() string {
+	return a.BaseUrl
+}
+
+func (a apiKeyAuthentication) getClient() *http.Client {
+	return &a.Client
+}