<template>
 <div id="login" class="login"></div>
</template>

<script>
export default {
 name: "WXLogin",
 data: function() {
  return {};
 },
 mounted() {
  this.wechatHandleClick();
  document.getElementsByTagName("iframe")[0].height="320";
  document.getElementsByTagName("iframe")[0].style.marginLeft="30px";
 },
 methods: {
  wechatHandleClick() {
   let ba64Css =
    "css代码base64编码";// 微信需要https的样式路径，这里将样式内容加密base64，可以避免使用https，如果你的网站是https的可以直接使用安官方文档使用css文件路径
   const appid = "你第一步申请的Appid";
   const redirect_uri = encodeURIComponent("http://*/#/login");
   var obj = new WxLogin({
    id: "login", //div的id
    appid: appid,
    scope: "snsapi_login",//固定内容
    redirect_uri: redirect_uri, //回调地址
    // href: "http://*/static/UserCss/WeChart.css" //自定义样式链接，第三方可根据实际需求覆盖默认样式。    
    href: "data:text/css;base64," + ba64Css
    // state: "", //参数，可带可不带
    // style: "", //样式 提供"black"、"white"可选，默认为黑色文字描述
   });
  }
 }
};
</script>

 @Watch("$route")
 async RouteChange(newVal, oldVal) {
  await this.weixinRedirect();
 }
 // 请求微信后台
 async weixinRedirect() {
  let code = this.$route.query.code;
  let state = this.$route.query.state;
  if (code) {
   let wxTo = {
    code,
    state
   };
   //请求后台
   this.$http("*/WeixinRedirect",data:wxTo).then((token)=>{
     //登录成功，把token写入cookie
     //跳转到主页
      this.$router.replace({ path: "/", replace: true });
   }).catch(error => {
     //保持当前页面
     this.$router.replace({ path: "/login", replace: true });
    });
  }
 }
}

[HttpPost]
public async Task<AuthenticateResultModel> WeixinRedirect(string code, string state)
{
  if (code.IsNullOrEmpty())
  {
    throw new UserFriendlyException("微信授权失败，请重新授权");
  }
  var appid = configuration["Authentication:Wechat:AppId"];
  var secret = configuration["Authentication:Wechat:AppSecret"];
  var url = $"https://api.weixin.qq.com/sns/oauth2/access_token";
  var httpClient = httpClientFactory.CreateClient();
  httpClient.DefaultRequestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)");
  httpClient.Timeout = TimeSpan.FromMinutes(3);

  var resstr = await httpClient.GetStringAsync(url);
  try{
    //如果微信授权返回失败这里序列化不成功
   var res = JsonSerializationHelper.DeserializeWithType<WeiXinAccess_tokenResponse>(resstr);
  }catch (Exception e)
  {
    throw new UserFriendlyException("获取微信access_token失败");
  }
  if (res == null || res.openid.IsNullOrEmpty())
  {
    throw new UserFriendlyException("获取微信access_token失败");
  }
  var userId = //根据openID获取用户id，我们系统要求用户提前把微信和用户关联绑定，所以这里可以根据微信用户的openID获取到户农户id;
  //使用用户直接登录
  if (!userId.IsNullOrEmpty()&&long.TryParse(userId, out long id))
  {
    var user = await _userManager.GetUserByIdAsync(id);
    var loginResult = await _logInManager.LoginByUser(user);
    string accessToken = CreateAccessToken(CreateJwtClaims(loginResult.Identity));

    return new AuthenticateResultModel
    {
      AccessToken = accessToken,
      EncryptedAccessToken = GetEncrpyedAccessToken(accessToken),
      ExpireInSeconds = (int)_tokenConfiguration.Expiration.TotalSeconds,
      UserId = loginResult.User.Id
    };
  }
  throw new UserFriendlyException("微信尚未绑定账号，请使用账号登录后绑定微信。");

}

public class WeiXinAccess_tokenResponse
{
  public string access_token { get; set; }
  public int expires_in { get; set; }
  public string refresh_token { get; set; }
  public string openid { get; set; }
  public string scope { get; set; }
  public string unionid { get; set; }
}