fix(drivers/lanzou): handle acw_sc__v2 challenge in Login function (#2876)

The Login endpoint may return an acw_sc__v2 validation page when accessed,
which previously caused login failures. This change adds the same retry
logic and cookie handling already used in request() to automatically solve
the challenge, ensuring login success even when the anti-bot mechanism is
triggered.

drivers/lanzou/util.go

@@ -157,25 +157,43 @@ func (d *LanZou) request(url string, method string, callback base.ReqCallback, u
 }
 
 func (d *LanZou) Login() ([]*http.Cookie, error) {
-	resp, err := base.NewRestyClient().SetRedirectPolicy(resty.NoRedirectPolicy()).
-		R().SetFormData(map[string]string{
-		"task":         "3",
-		"uid":          d.Account,
-		"pwd":          d.Password,
-		"setSessionId": "",
-		"setSig":       "",
-		"setScene":     "",
-		"setTocen":     "",
-		"formhash":     "",
-	}).Post("https://up.woozooo.com/mlogin.php")
-	if err != nil {
-		return nil, err
+	var vs string
+	for retry := 0; retry < 3; retry++ {
+		req := base.NewRestyClient().SetRedirectPolicy(resty.NoRedirectPolicy()).R()
+
+		// 如果已计算出 acw_sc__v2，通过 cookie 携带
+		if vs != "" {
+			req.SetHeader("cookie", "acw_sc__v2="+vs)
+		}
+
+		resp, err := req.SetFormData(map[string]string{
+			"task":         "3",
+			"uid":          d.Account,
+			"pwd":          d.Password,
+			"setSessionId": "",
+			"setSig":       "",
+			"setScene":     "",
+			"setTocen":     "",
+			"formhash":     "",
+		}).Post("https://up.woozooo.com/mlogin.php")
+		if err != nil {
+			return nil, err
+		}
+		bodyStr := resp.String()
+		if strings.Contains(bodyStr, "acw_sc__v2") {
+			vs, err = CalcAcwScV2(bodyStr)
+			if err != nil {
+				return nil, err
+			}
+			continue
+		}
+		if utils.Json.Get(resp.Body(), "zt").ToInt() != 1 {
+			return nil, fmt.Errorf("login err: %s", resp.Body())
+		}
+		d.Cookie = CookieToString(resp.Cookies())
+		return resp.Cookies(), nil
 	}
-	if utils.Json.Get(resp.Body(), "zt").ToInt() != 1 {
-		return nil, fmt.Errorf("login err: %s", resp.Body())
-	}
-	d.Cookie = CookieToString(resp.Cookies())
-	return resp.Cookies(), nil
+	return nil, errors.New("acw_sc__v2 validation error")
 }
 
 /*