Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/github.com/denverdino/aliyungo/util/signature.go

@@ -0,0 +1,40 @@
+package util
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/base64"
+	"net/url"
+	"strings"
+)
+
+//CreateSignature creates signature for string following Aliyun rules
+func CreateSignature(stringToSignature, accessKeySecret string) string {
+	// Crypto by HMAC-SHA1
+	hmacSha1 := hmac.New(sha1.New, []byte(accessKeySecret))
+	hmacSha1.Write([]byte(stringToSignature))
+	sign := hmacSha1.Sum(nil)
+
+	// Encode to Base64
+	base64Sign := base64.StdEncoding.EncodeToString(sign)
+
+	return base64Sign
+}
+
+func percentReplace(str string) string {
+	str = strings.Replace(str, "+", "%20", -1)
+	str = strings.Replace(str, "*", "%2A", -1)
+	str = strings.Replace(str, "%7E", "~", -1)
+
+	return str
+}
+
+// CreateSignatureForRequest creates signature for query string values
+func CreateSignatureForRequest(method string, values *url.Values, accessKeySecret string) string {
+
+	canonicalizedQueryString := percentReplace(values.Encode())
+
+	stringToSign := method + "&%2F&" + url.QueryEscape(canonicalizedQueryString)
+
+	return CreateSignature(stringToSign, accessKeySecret)
+}