<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代碼base64編碼";// 微信需要https的樣式路徑，這里將樣式內(nèi)容加密base64，可以避免使用https，如果你的網(wǎng)站是https的可以直接使用安官方文檔使用css文件路徑
   const appid = "你第一步申請的Appid";
   const redirect_uri = encodeURIComponent("http://*/#/login");
   var obj = new WxLogin({
    id: "login", //div的id
    appid: appid,
    scope: "snsapi_login",//固定內(nèi)容
    redirect_uri: redirect_uri, //回調(diào)地址
    // href: "http://*/static/UserCss/WeChart.css" //自定義樣式鏈接，第三方可根據(jù)實際需求覆蓋默認樣式。    
    href: "data:text/css;base64," + ba64Css
    // state: "", //參數(shù)，可帶可不帶
    // style: "", //樣式 提供"black"、"white"可選，默認為黑色文字描述
   });
  }
 }
};
</script>

 @Watch("$route")
 async RouteChange(newVal, oldVal) {
  await this.weixinRedirect();
 }
 // 請求微信后臺
 async weixinRedirect() {
  let code = this.$route.query.code;
  let state = this.$route.query.state;
  if (code) {
   let wxTo = {
    code,
    state
   };
   //請求后臺
   this.$http("*/WeixinRedirect",data:wxTo).then((token)=>{
     //登錄成功，把token寫入cookie
     //跳轉(zhuǎn)到主頁
      this.$router.replace({ path: "/", replace: true });
   }).catch(error => {
     //保持當前頁面
     this.$router.replace({ path: "/login", replace: true });
    });
  }
 }
}

[HttpPost]
public async Task<AuthenticateResultModel> WeixinRedirect(string code, string state)
{
  if (code.IsNullOrEmpty())
  {
    throw new UserFriendlyException("微信授權失敗，請重新授權");
  }
  var appid = configuration["Authentication:Wechat:AppId"];
  var secret = configuration["Authentication:Wechat:AppSecret"];
  var url = $"https://api.weixin.qq.com/sns/oauth2/access_token?appid={appid}&secret={secret}&code=[code]&grant_type=authorization_code";
  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{
    //如果微信授權返回失敗這里序列化不成功
   var res = JsonSerializationHelper.DeserializeWithType<WeiXinAccess_tokenResponse>(resstr);
  }catch (Exception e)
  {
    throw new UserFriendlyException("獲取微信access_token失敗");
  }
  if (res == null || res.openid.IsNullOrEmpty())
  {
    throw new UserFriendlyException("獲取微信access_token失敗");
  }
  var userId = //根據(jù)openID獲取用戶id，我們系統(tǒng)要求用戶提前把微信和用戶關聯(lián)綁定，所以這里可以根據(jù)微信用戶的openID獲取到戶農(nóng)戶id;
  //使用用戶直接登錄
  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("微信尚未綁定賬號，請使用賬號登錄后綁定微信。");

}

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; }
}