asp.net core 腾讯验证码的接入示例代码

Intro

之前使用的验证码服务是用的极验验证，而且是比较旧的，好久之前接入的，而且验证码服务依赖 Session，有点不太灵活，后来发现腾讯也有验证码服务，而且支持小程序，并且是唯一支持小程序的验证码。。（垄断么。。）

而且相比之下，腾讯验证码不需要依赖 Session，集成起来也比较方便，于是就用了腾讯验证码，详细参考：https://007.qq.com/product.html?ADTAG=index.block

验证流程

服务器端接入

using System.ComponentModel.DataAnnotations;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using WeihanLi.Extensions;

namespace ActivityReservation.Common
{
  public class TencentCaptchaOptions
  {
    /// <summary>
    /// 客户端AppId
    /// </summary>
    [Required]
    public string AppId { get; set; }

    /// <summary>
    /// App Secret Key
    /// </summary>
    [Required]
    public string AppSecret { get; set; }
  }

  public class TencentCaptchaRequest
  {
    /// <summary>
    /// 验证码客户端验证回调的票据
    /// </summary>
    public string Ticket { get; set; }

    /// <summary>
    /// 验证码客户端验证回调的随机串
    /// </summary>
    public string Nonce { get; set; }

    /// <summary>
    /// 提交验证的用户的IP地址（eg: 10.127.10.2）
    /// </summary>
    public string UserIP { get; set; }
  }

  public class TencentCaptchaHelper
  {
    private class TencentCaptchaResponse
    {
      /// <summary>
      /// 1:验证成功，0:验证失败，100:AppSecretKey参数校验错误
      /// </summary>
      [JsonProperty("response")]
      public int Code { get; set; }

      /// <summary>
      /// 恶意等级 [0, 100]
      /// </summary>
      [JsonProperty("evil_level")]
      public string EvilLevel { get; set; }

      /// <summary>
      /// 错误信息
      /// </summary>
      [JsonProperty("err_msg")]
      public string ErrorMsg { get; set; }
    }

    private const string TencentCaptchaVerifyUrl = "https://ssl.captcha.qq.com/ticket/verify";
    private readonly TencentCaptchaOptions _captchaOptions;
    private readonly ILogger _logger;
    private readonly HttpClient _httpClient;

    public TencentCaptchaHelper(
      IOptions<TencentCaptchaOptions> option,
      ILogger<TencentCaptchaHelper> logger,
      HttpClient httpClient)
    {
      _captchaOptions = option.Value;
      _logger = logger;
      _httpClient = httpClient;
    }

    public async Task<bool> IsValidRequestAsync(TencentCaptchaRequest request)
    {
      // 参考文档：https://007.qq.com/captcha/#/gettingStart
      var response = await _httpClient.GetAsync(
        $"{TencentCaptchaVerifyUrl}?aid={_captchaOptions.AppId}&AppSecretKey={_captchaOptions.AppSecret}&Ticket={request.Ticket}&Randstr={request.Nonce}&UserIP={request.UserIP}");
      var responseText = await response.Content.ReadAsStringAsync();
      if (responseText.IsNotNullOrEmpty())
      {
        _logger.Debug($"Tencent captcha verify response:{responseText}");
        var result = responseText.JsonToType<TencentCaptchaResponse>();
        if (result.Code == 1)
        {
          return true;
        }
      }
      return false;
    }
  }
}

Startup 配置：

services.AddHttpClient<TencentCaptchaHelper>(client => client.Timeout = TimeSpan.FromSeconds(3))
  .ConfigurePrimaryHttpMessageHandler(() => new NoProxyHttpClientHandler());
services.AddTencentCaptchaHelper(options =>
{
  options.AppId = Configuration["Tencent:Captcha:AppId"];
  options.AppSecret = Configuration["Tencent:Captcha:AppSecret"];
});

前端接入

前端接入这里不作多介绍了，接入方式多种多样，具体可以参考官方文档：https://cloud.tencent.com/document/product/1110/36841

下面的代码是 angular spa 在前端接入的核心代码

 private loadCaptcha(): void {
  var tCaptcha = document.getElementById("tCaptcha");
  if (tCaptcha) {
   this.InitCaptcha();
   return;
  }
  let script = <any>document.createElement('script');
  script.id = "tCaptcha";
  script.type = 'text/javascript';
  script.src = "https://ssl.captcha.qq.com/TCaptcha.js"
  if (script.readyState) { //IE
   script.onreadystatechange = () => {
    if (script.readyState === "loaded" || script.readyState === "complete") {
     this.InitCaptcha();
    }
   };
  } else { //Others
   script.onload = () => {
    this.InitCaptcha();
   };
  }
  document.getElementsByTagName('body')[0].appendChild(script);
 }

 private InitCaptcha(): void {
  let captchaDom = document.getElementById('TencentCaptcha1');
  if (!captchaDom) {
   return;
  }
  this.tencentRecaptcha = new TencentCaptcha(
   captchaDom, appId, (res) => {
    this.captchaValid = false;
    console.log(res);
    // res（用户主动关闭验证码）= {ret: 2, ticket: null}
    // res（验证成功） = {ret: 0, ticket: "String", randstr: "String"}
    if (res.ret === 0) {
     this.captchaInfo.nonce = res.randstr;
     this.captchaInfo.ticket = res.ticket;
     this.captchaValid = true;
     this.tencentRecaptcha.destroy();

     let button = <HTMLElement>document.getElementById("btnSubmit");
     button.click();
    }
   }
  );
  console.log(`captcha inited`);
  this.tencentRecaptcha.show();
 }

使用效果：

老版网站接入效果：

Reference

https://github.com/WeihanLi/ActivityReservation
https://reservation.weihanli.xyz/Home/Reservate
https://reservation-client.weihanli.xyz/reservation/new
https://cloud.tencent.com/document/product/1110/36841

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