优化结构

internal/modules/system/utils/paymentutil/signing.go

@@ -0,0 +1,58 @@
+package paymentutil
+
+import (
+	"crypto/hmac"
+	"crypto/md5"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"net/url"
+	"sort"
+	"strings"
+)
+
+func WechatV2Sign(values map[string]string, key, signType string) string {
+	keys := make([]string, 0, len(values))
+	for k, v := range values {
+		if k != "sign" && v != "" {
+			keys = append(keys, k)
+		}
+	}
+	sort.Strings(keys)
+	parts := make([]string, 0, len(keys))
+	for _, k := range keys {
+		parts = append(parts, k+"="+values[k])
+	}
+	raw := strings.Join(parts, "&") + "&key=" + key
+	if strings.EqualFold(signType, "HMAC-SHA256") {
+		return HMACSHA256Hex([]byte(raw), key, true)
+	}
+	sum := md5.Sum([]byte(raw))
+	return strings.ToUpper(hex.EncodeToString(sum[:]))
+}
+
+func MD5Canonical(values map[string]any, secret string) string {
+	keys := make([]string, 0, len(values))
+	for key, value := range values {
+		if key != "sign" && value != nil && fmt.Sprint(value) != "" {
+			keys = append(keys, key)
+		}
+	}
+	sort.Strings(keys)
+	query := url.Values{}
+	for _, key := range keys {
+		query.Set(key, fmt.Sprint(values[key]))
+	}
+	sum := md5.Sum([]byte(query.Encode() + "&key=" + secret))
+	return strings.ToUpper(hex.EncodeToString(sum[:]))
+}
+
+func HMACSHA256Hex(raw []byte, secret string, upper bool) string {
+	h := hmac.New(sha256.New, []byte(secret))
+	_, _ = h.Write(raw)
+	result := hex.EncodeToString(h.Sum(nil))
+	if upper {
+		return strings.ToUpper(result)
+	}
+	return result
+}