chore: 并入 iotlcm-upstream-chan 历史到 upstream-chan/（原提交 1e74497）

upstream-chan/internal/logic/upstreamimpl/dx/sign.go

@@ -0,0 +1,69 @@
+package dx
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"sort"
+	"strings"
+	"time"
+)
+
+const (
+	// DefaultBaseURL 电信API基础地址
+	DefaultBaseURL = "https://cmp-api.ctwing.cn:20164"
+)
+
+// GetTimestampGMT 返回 GMT 时区的 yyyyMMddHHmmss 格式时间戳
+func GetTimestampGMT() string {
+	return time.Now().UTC().Format("20060102150405")
+}
+
+// OrderParams 将 URL params 按 key 字典序排序
+func OrderParams(params string) (string, error) {
+	if params == "" {
+		return "", nil
+	}
+	kvs := strings.Split(params, "&")
+	m := make(map[string]string, len(kvs))
+	for _, kv := range kvs {
+		idx := strings.Index(kv, "=")
+		if idx < 0 {
+			continue
+		}
+		m[kv[:idx]] = kv[idx+1:]
+	}
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	var parts []string
+	for _, k := range keys {
+		parts = append(parts, k+"="+m[k])
+	}
+	return strings.Join(parts, "&"), nil
+}
+
+// SignMD5 对 reqStr 做 MD5 加密，返回小写十六进制字符串
+func SignMD5(reqStr string) string {
+	h := md5.Sum([]byte(reqStr))
+	return strings.ToLower(hex.EncodeToString(h[:]))
+}
+
+// BuildSign 构造签名：params + body + secretKey + timestamp → MD5 → hex
+func BuildSign(params, body, secretKey, timestamp string) (string, error) {
+	ordered, err := OrderParams(params)
+	if err != nil {
+		return "", err
+	}
+	reqStr := ordered + body + secretKey + timestamp
+	md5Str := SignMD5(reqStr)
+	return hex.EncodeToString([]byte(md5Str)), nil
+}
+
+// BuildSignV3 follows the V3 Java sample: encode the lowercase MD5 digest
+// string as hex a second time, then uppercase that outer encoding.
+func BuildSignV3(params, body, secretKey, timestamp string) (string, error) {
+	sign, err := BuildSign(params, body, secretKey, timestamp)
+	return strings.ToUpper(sign), err
+}