支付宝小程序开发-利用支付宝的SDK获取用户User ID

支付宝小程序在前端只能获取到用户昵称和头像，但是这是远远不够的，我们至少需要获取到用户的支付宝User ID，这个时候就必须在后端利用支付宝的SDK来获取了，当然前端要发出 httprequest 请求，下面结合前两篇的例子进行修改

支付宝小程序前端

app.js

App({
  globalData:{
    studentid:'',
    username:'',
    apiurl: 'http://XXX'
  }, 
  getUserInfo(){
    var that = this
    return new Promise((resovle,reject)=>{
      if(this.userInfo) resovle(this.userInfo);
      
      //调用用户授权 api 获取用户信息
      my.getAuthCode({
        scopes: 'auth_user', 
        success:(res) =>{
           if (res.authCode) {    
             my.httpRequest({
               url: that.globalData.apiurl + '/api/AliPay/GetUserInfo',
               method: 'GET',
               data: {
                  auth_code: res.authCode
               },
               dataType: 'json',
               success: function(res) {
                  that.globalData.studentid = res.data.data.student_id;
                  that.globalData.username = res.data.data.user_name;
                  //获取用户信息,照片、昵称
                  my.getAuthUserInfo({
                    scopes: ['auth_user'],
                    success: (res) => {
                      that.userInfo = res;
                      resovle(that.userInfo);
                   },
                   fail:() =>{
                      reject({});
                   }
                  });
                  console.log('返回UserDetail', res.data.data);         
               },
               fail: function(res) {
                  my.alert({content: 'fail'});
               },
               complete: function(res) {
                  my.hideLoading();
               }
            });
          }
        },
        fail:() =>{
          reject({});
        }
      });
    });
  },

  onLaunch(options) {

  },
  onShow(options) {
    // 从后台被 scheme 重新打开
  },
});

上面的代码调取后端webapi  http://XXX/api/AliPay/GetUserInfo 来获取用户信息，并把取到的userid,username 存到全局变量 globalData 里面

const app = getApp();

Page({
  data: {
    src: '',
    username: '',
    studentid: ''
  },
  imageError: function (e) {
    console.log('image 发生错误', e.detail.errMsg)
  },
  imageLoad: function (e) {
    console.log('image 加载成功', e);
  },
  onLoad(query) {
    // 页面加载
    app.getUserInfo().then(
      user => {
            console.info(user);
            //设置头像
            if (user.avatar.length > 0) {
               this.setData({src: user.avatar});
            }
            else{
               this.setData({src: '/images/tou.png'});
            } 
            //设置用户名    
            if (app.globalData.username)
            {
               this.setData({username: app.globalData.username});
            }
            else
            {
               this.setData({username: user.nickName});
            }

            if(app.globalData.studentid)
            {
               //设置UserId
               this.setData({studentid: app.globalData.studentid}); 
            }
        }
    );
  },
  onShow() {
    // 页面显示
       
  },
  onReady() {

     
  }
});

本来官方只提供了.net framwork 的SDK，但网上已经有人移植了.net core 的版本，运行 Install-Package Alipay.AopSdk.Core 进行安装，在 appsettings.json 进行如下的配置，写上你的小程序公匙，私匙，appid 等参数 uid 可以不写

  "Alipay": {
    //校园码支付宝小程序正式环境
    "AlipayPublicKey": "",
    "AppId": "",
    "CharSet": "UTF-8",
    "GatewayUrl": "https://openapi.alipay.com/gateway.do",
    "PrivateKey": "",
    "SignType": "RSA2",
    "Uid": ""
  }

然后在后端core还需要注入Service

 Startup.cs 代码就补贴全部了，只贴相关的，这段代码就干这么个事，读取 appsettings.json  并注入服务

        private void ConfigureAlipay(IServiceCollection services)
        {
            var alipayOptions = Configuration.GetSection("Alipay").Get<AlipayOptions>();
            //检查RSA私钥
            AlipayConfigChecker.Check(alipayOptions.SignType, alipayOptions.PrivateKey);
            services.AddAlipay(options => options.SetOption(alipayOptions)).AddAlipayF2F();
        }


        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            //配置alipay服务
            ConfigureAlipay(services);
            ......

在得到从前端传过来的授权码之后，利用授权得到用户信息 

        private AlipayUserInfoShareResponse GetShareResponse(string auth_code)
        {
            var alipaySystemOauthTokenRequest = new AlipaySystemOauthTokenRequest
            {
                Code = auth_code,
                GrantType = "authorization_code"
            };
            var oauthTokenResponse = _alipayService.Execute(alipaySystemOauthTokenRequest);
            AlipayUserInfoShareRequest requestUser = new AlipayUserInfoShareRequest();
            AlipayUserInfoShareResponse userinfoShareResponse = _alipayService.Execute(requestUser, oauthTokenResponse.AccessToken);
            return userinfoShareResponse;
        }

        /// <summary>
        /// 获取用户信息
        /// </summary>
        /// <param name="auth_code"></param>
        /// <returns></returns>
        [HttpGet]
        [Route("GetUserInfo")]
        public ActionResult GetUserInfo(string auth_code)
        {
            try
            {
                AlipayUserInfoShareResponse userinfoShareResponse = GetShareResponse(auth_code);
                return new JsonResult(new { data = userinfoShareResponse });
            }
            catch (Exception ex)
            {
                log.Error("错误:" + ex.ToString());
                return new JsonResult(new { data = ex.ToString() });
            }
        }

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