分离小米支付与taptap支付到库里面

package/pay/xiaomi/helper.go

@@ -0,0 +1,63 @@
+package xiaomi
+
+import (
+	"crypto/hmac"
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// SignatureHelper 签名辅助类
+type SignatureHelper struct{}
+
+// hmacSHA1 计算HMAC-SHA1哈希值
+func hmacSHA1(data, key string) string {
+	h := hmac.New(sha1.New, []byte(key))
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+// Sign 计算hmac-sha1签名
+func (m *MiPay) Sign(params map[string]string, secretKey string) string {
+	if _, ok := params["signature"]; ok {
+		delete(params, "signature")
+	}
+	for k, v := range params {
+		if v == "" || v == "0" {
+			delete(params, k)
+		}
+	}
+	sortString := m.buildSortString(params)
+	signature := hmacSHA1(sortString, secretKey)
+	return signature
+}
+
+// VerifySignature 验证签名
+func (m *MiPay) VerifySignature(params map[string]string, signature, secretKey string) bool {
+	tmpSign := m.Sign(params, secretKey)
+	return tmpSign == signature
+}
+
+// buildSortString 构造排序字符串
+func (m *MiPay) buildSortString(params map[string]string) string {
+	if len(params) == 0 {
+		return ""
+	}
+
+	// 按键排序
+	keys := make([]string, 0, len(params))
+	for k := range params {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	// 构建排序字符串
+	var fields []string
+	for _, k := range keys {
+		fields = append(fields, fmt.Sprintf("%s=%s", k, params[k]))
+	}
+
+	return strings.Join(fields, "&")
+}