chore: 并入 iotlcm-upstream-proxy 历史到 upstream-proxy/（原提交 44209ec）

upstream-proxy/internal/logic/upstreamimpl/dx/client.go

@@ -0,0 +1,96 @@
+package dx
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// Config 网关鉴权与请求配置
+type Config struct {
+	BaseURL   string // 默认 https://cmp-api.ctwing.cn:20164
+	AppKey    string
+	AppSecret string
+	Timeout   time.Duration
+}
+
+// Client API 客户端
+type Client struct {
+	baseURL   string
+	appKey    string
+	appSecret string
+	http      *http.Client
+}
+
+// New 创建客户端
+func NewClient(cfg Config) *Client {
+	base := cfg.BaseURL
+	if base == "" {
+		base = DefaultBaseURL
+	}
+	timeout := cfg.Timeout
+	if timeout == 0 {
+		timeout = 10 * time.Second
+	}
+	return &Client{
+		baseURL:   strings.TrimSuffix(base, "/"),
+		appKey:    cfg.AppKey,
+		appSecret: cfg.AppSecret,
+		http: &http.Client{
+			Timeout: timeout,
+		},
+	}
+}
+
+// DoGetRequest 通用GET请求（自动处理签名）
+// endpoint: API路径，如 "/api/v1/openbill/queryTraffic"
+// params: 查询参数，需调用方自行构建
+func (c *Client) DoGetRequest(ctx context.Context, endpoint string, params url.Values) ([]byte, error) {
+	req, err := c.doGetRequest(ctx, endpoint, params)
+	if err != nil {
+		return nil, err
+	}
+	return c.doRequest(req)
+}
+
+// doGetRequest 封装通用的 GET 请求构建逻辑
+func (c *Client) doGetRequest(ctx context.Context, endpoint string, params url.Values) (*http.Request, error) {
+	queryString := params.Encode()
+	timestamp := GetTimestampGMT()
+	signStr, err := BuildSign(queryString, "", c.appSecret, timestamp)
+	if err != nil {
+		return nil, err
+	}
+	reqURL := c.baseURL + endpoint + "?" + queryString
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, reqURL, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("AppKey", c.appKey)
+	req.Header.Set("Sign", signStr)
+	req.Header.Set("Timestamp", timestamp)
+	return req, nil
+}
+
+// doRequest 执行HTTP请求
+func (c *Client) doRequest(req *http.Request) ([]byte, error) {
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("http status %d: %s", resp.StatusCode, string(body))
+	}
+	return body, nil
+}