OrderSystem/OrderSystem.Web/Controllers/WxController.cs

using Bowin.Common.Cache;
using Bowin.Common.DES;
using Bowin.Common.ServiceToken;
using Bowin.Common.Utility;
using Bowin.Common.WebModels;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;
using OrderSystem.Entity.ViewModel;
using OrderSystem.Services.SystemSetting;
using System.Net.Http;

namespace OrderSystem.Web.Controllers
{
    [Route("api/[controller]/[action]")]
    [Authorize]
    public class WxController : ControllerBase
    {
        private readonly IHttpClientFactory _clientFactory;
        public WxController(IHttpClientFactory clientFactory)
        {
            _clientFactory = clientFactory;
        }

        [AllowAnonymous]
        [HttpGet]
        public ResultMessage GetOauthUrlForBase()
        {
            string url = $"https://open.weixin.qq.com/connect/oauth2/authorize?appid={ Configuration.Current.WxConfig.AppId}&redirect_uri={Configuration.Current.WxConfig.RedirectURI}/{Configuration.Current.AppSettings.H5Version}/index.html&response_type=code&scope=snsapi_base&state=STATE#wechat_redirect";

            return ResultMessage.Success(url);
        }


        [AllowAnonymous]
        [HttpGet]
        public ResultMessage GetOpenID(string code) 
        {
            string url = $"https://api.weixin.qq.com/sns/oauth2/access_token?appid={ Configuration.Current.WxConfig.AppId}&secret={Configuration.Current.WxConfig.AppSecret}&code={code}&grant_type=authorization_code";

            var client = _clientFactory.CreateClient();

            var httpResponse = client.PostAsync(url, null).Result;

            if (httpResponse.IsSuccessStatusCode)
            {
                var jsonData = httpResponse.Content.ReadAsStringAsync().Result;

                var error = JsonConvert.DeserializeObject<WxMpError>(jsonData);

                if (error != null && !string.IsNullOrEmpty(error.errcode))
                    return ResultMessage.GetError($"获取openID接口返回错误!错误代码：{error.errcode}，错误信息：{error.errmsg}");

                var data = JsonConvert.DeserializeObject<WxMpOAuth2AccessToken>(jsonData);

                return ResultMessage.Success(data.openid);

            }
            else 
            {
                return ResultMessage.GetError("获取openID接口请求错误!错误代码：" + httpResponse.StatusCode);
            }
           
        }

        public class WxMpOAuth2AccessToken 
        {
            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; }
        }

        public class WxMpError 
        {
            public string errcode { get; set; }
            public string errmsg { get; set; }
        }
    }
}