前言

微信相關配置請參考 微信公眾平臺 的這篇文章。注意授權回調域名一定要修改正確。
微信網頁授權是通過OAuth2.0機制實現的，所以我們可以使用 https://github.com/china-live/QQConnect 這個開源項目提供的中間件來實現微信第三方登錄的流程。

開發流程

1、新建一個.net core webapi 項目。在NuGet中查找并安裝 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", //日志級別從低到高，依次為：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>
        /// 微信登錄
        /// </summary>
        /// <param name="redirectUrl">授權成功后的跳轉地址</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>
        /// 微信授權成功后自動回調的地址
        /// </summary>
        /// <param name="provider"></param>
        /// <param name="redirectUrl">授權成功后的跳轉地址</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 記錄授權成功后的微信信息 
            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 = 0;
            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、將網站發布到外網，請求https://你的授權域名/api/account/LoginByWeChat?redirectUrl=授權成功后要跳轉的頁面即可調起微信授權頁面。

注意

微信授權必須使用https

微信開放平臺和微信公眾平臺都有提供網站用微信登錄的接口，前者適用于任何網站，后者只適用于微信服務號的內嵌網站。

本篇相關源碼地址：https://github.com/ren8179/QrF.OAuth.WeChat/tree/master