.net Core2.2 WebApi通过OAuth2.0实现微信登录

前言

微信相关配置请参考 微信公众平台 的这篇文章。注意授权回调域名一定要修改正确。

微信网页授权是通过OAuth2.0机制实现的，所以我们可以使用 https://github.com/china-live/QQConnect 这个开源项目提供的中间件来实现微信第三方登录的流程。

开发流程

1、新建一个.net core webapi 项目。在NuGet中查找并安装 AspNetCore.Authentication.WeChat 包。

2、修改 appsettings.json 配置文件，增加以下配置：

 "Authentication": {
     "WeChat": {
       "AppId": "微信AppID",
       "AppSecret": "微信AppSecret"
     }
   },
   "Logging": {
     "LogLevel": {
       "Default": "Debug", //日志级别从低到高，依次为：Debug,Information,Warning,Error,None
       "Microsoft.EntityFrameworkCore": "Error",
       "System": "Error"
     }
   }

3、修改 Startup

         services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
         services.AddAuthentication()
                 .AddWeChat(wechatOptions =>
                 {
                     wechatOptions.AppId = Configuration["Authentication:WeChat:AppId"];
                     wechatOptions.AppSecret = Configuration["Authentication:WeChat:AppSecret"];
                     wechatOptions.UseCachedStateDataFormat = true;
                 });

4、新增 AccountController

     [Route("api/[controller]")]
     [ApiController]
     public class AccountController : ControllerBase
     {
         private const string LoginProviderKey = "LoginProvider";
         private const string Provider_WeChat = "WeChat";
         private readonly ILogger _logger;
         private readonly IHttpContextAccessor _contextAccessor;

         public AccountController(ILogger<AccountController> logger,
             IHttpContextAccessor contextAccessor)
         {
             _logger = logger;
             _contextAccessor = contextAccessor;
         }
         /// <summary>
         /// 微信登录
         /// </summary>
         /// <param name="redirectUrl">授权成功后的跳转地址</param>
         /// <returns></returns>
         [HttpGet("LoginByWeChat")]
         public IActionResult LoginByWeChat(string redirectUrl)
         {
             var request = _contextAccessor.HttpContext.Request;
             var url = $"{request.Scheme}://{request.Host}{request.PathBase}{request.Path}Callback?provider={Provider_WeChat}&redirectUrl={redirectUrl}";
             var properties = new AuthenticationProperties { RedirectUri = url };
             properties.Items[LoginProviderKey] = Provider_WeChat;
             return Challenge(properties, Provider_WeChat);
         }
         /// <summary>
         /// 微信授权成功后自动回调的地址
         /// </summary>
         /// <param name="provider"></param>
         /// <param name="redirectUrl">授权成功后的跳转地址</param>
         /// <returns></returns>
         [HttpGet("LoginByWeChatCallback")]
         public async Task<IActionResult> LoginByWeChatCallbackAsync(string provider = null, string redirectUrl = "")
         {
             var authenticateResult = await _contextAccessor.HttpContext.AuthenticateAsync(provider);
             if (!authenticateResult.Succeeded) return Redirect(redirectUrl);
             var openIdClaim = authenticateResult.Principal.FindFirst(ClaimTypes.NameIdentifier);
             if (openIdClaim == null || openIdClaim.Value.IsNullOrWhiteSpace())
                 return Redirect(redirectUrl);
             //TODO 记录授权成功后的微信信息
             var city = authenticateResult.Principal.FindFirst("urn:wechat:city")?.Value;
             var country = authenticateResult.Principal.FindFirst(ClaimTypes.Country)?.Value;
             var headimgurl = authenticateResult.Principal.FindFirst(ClaimTypes.Uri)?.Value;
             var nickName = authenticateResult.Principal.FindFirst(ClaimTypes.Name)?.Value;
             var openId = authenticateResult.Principal.FindFirst(ClaimTypes.NameIdentifier)?.Value;
             var privilege = authenticateResult.Principal.FindFirst("urn:wechat:privilege")?.Value;
             var province = authenticateResult.Principal.FindFirst("urn:wechat:province")?.Value;
             var sexClaim = authenticateResult.Principal.FindFirst(ClaimTypes.Gender);
             int sex = ;
             if (sexClaim != null && !sexClaim.Value.IsNullOrWhiteSpace())
                 sex = int.Parse(sexClaim.Value);
             var unionId = authenticateResult.Principal.FindFirst("urn:wechat:unionid")?.Value;
             _logger.LogDebug($"WeChat Info=> openId: {openId},nickName: {nickName}");
             return Redirect($"{redirectUrl}?openId={openIdClaim.Value}");
         }
     }

5、将网站发布到外网，请求

https://你的授权域名/api/account/LoginByWeChat?redirectUrl=授权成功后要跳转的页面

即可调起微信授权页面。

注意

微信授权必须使用https

微信开放平台和微信公众平台都有提供网站用微信登录的接口，前者适用于任何网站，后者只适用于微信服务号的内嵌网站

本篇相关源码地址：https://github.com/ren8179/QrF.OAuth.WeChat/tree/master