Supperxin.Geetest
极验验证的 .NET Core 版本
安装：
Install-Package Supperxin.Geetest
使用
服务端
服务端主要分为两步：
- 请求Geetest服务器生成验证码
- 分析客户端Form提交的验证码是否合法
第一步的示例代码如下：
[HttpGet]
[AllowAnonymous]
public async Task<IActionResult> Login(string returnUrl = null)
{
// Clear the existing external cookie to ensure a clean login process
await HttpContext.Authentication.SignOutAsync(_externalCookieScheme);
ViewData["ReturnUrl"] = returnUrl;
ViewData["Captcha"] = getCaptcha();
return View();
}
private String getCaptcha()
{
GeetestLib geetest = new GeetestLib(_geetestOptions.Id, _geetestOptions.Key);
String userID = "test";
Byte gtServerStatus = geetest.preProcess(userID);
// Session[GeetestLib.gtServerStatusSessionKey] = gtServerStatus;
// Session["userID"] = userID;
return geetest.getResponseStr();
}第二步的示例代码如下：
public async Task<IActionResult> Login(LoginViewModel model, string returnUrl = null)
{
ViewData["ReturnUrl"] = returnUrl;
if (ModelState.IsValid)
{
GeetestLib geetest = new GeetestLib(_geetestOptions.Id, _geetestOptions.Key);
//Byte gt_server_status_code = (Byte) Session[GeetestLib.gtServerStatusSessionKey];
Byte gt_server_status_code = 1;
String userID = "test";
int validateResult = 0;
String challenge = Request.Form[GeetestLib.fnGeetestChallenge];
String validate = Request.Form[GeetestLib.fnGeetestValidate];
String seccode = Request.Form[GeetestLib.fnGeetestSeccode];
if (gt_server_status_code == 1) validateResult = geetest.enhencedValidateRequest(challenge, validate, seccode, userID);
else validateResult = geetest.failbackValidateRequest(challenge, validate, seccode);
if (validateResult != 1)
{
ModelState.AddModelError(string.Empty, "Invalid login attempt.");
return View(model);
}关于gt_server_status_code和userID两个参数，示例只是简单的复制，在实际环境中可以使用Distributed Cache来保存用户请求的实际数据
客户端
打开文件：Login.cshtml，在用户名和密码下方添加验证码区域，并且给submit button添加id
<div class="form-group">
<label class="col-md-2 control-label"></label>
<div id="captcha-box" class="col-md-10">
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<button id="login" type="submit" class="btn btn-default">Log in</button>
</div>
</div>调用geetest的sdk，生成验证码，并检测用户是否有通过验证码检测
<script src="~/js/gt.js"></script>
<script>
var data = @Html.Raw(ViewData["Captcha"]);
initGeetest({
// 以下配置参数来自服务端 SDK
gt: data.gt,
challenge: data.challenge,
offline: !data.success,
new_captcha: data.new_captcha
}, function (captchaObj) {
// 这里可以调用验证实例 captchaObj 的实例方法
captchaObj.appendTo('#captcha-box');
$('#login').click(function () {
var result = captchaObj.getValidate();
if (!result) {
alert('请完成验证');
return false;
}
})
})
</script>示例
可以直接运行Supperxin.Geetest.Demo.csproj来查看运行效果，运行之前需要配置appsettings.json中Geetest的id和key：
"Geetest": {
"Id": "",
"Key": ""
}运行效果如下：
