ASP.NET Core集成微信登录的示例分析

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工具：

Visual Studio 2015 update 3

Asp.Net Core 1.0

1 准备工作

申请微信公众平台接口测试帐号，申请网址：（mp.weixin.qq.com/debug/cgi-bin/sandbox?t=sandbox/login）。申请接口测试号无需公众帐号，可以直接体验和测试公众平台所有高级接口。

1.1 配置接口信息

1.2 修改网页授权信息

点击"修改"后在弹出页面填入你的网站域名：

2 新建网站项目

2.1 选择ASP.NET Core Web Application 模板

2.2 选择Web 应用程序，并更改身份验证为个人用户账户

3 集成微信登录功能

3.1添加引用

打开project.json文件，添加引用Microsoft.AspNetCore.Authentication.OAuth

3.2 添加代码文件

在项目中新建文件夹，命名为WeChatOAuth，并添加代码文件（本文最后附全部代码）。

3.3 注册微信登录中间件

打开Startup.cs文件，在Configure中添加代码：

app.UseWeChatAuthentication(new WeChatOptions(){ AppId = "******", AppSecret = "******"});

注意该代码的插入位置必须在app.UseIdentity()下方。

4 代码

WeChatAppBuilderExtensions.cs：

// Copyright (c) .NET Foundation. All rights reserved.// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.using System;using Microsoft.AspNetCore.Authentication.WeChat;using Microsoft.Extensions.Options;namespace Microsoft.AspNetCore.Builder{ /// 
 /// Extension methods to add WeChat authentication capabilities to an HTTP application pipeline. /// 
 public static class WeChatAppBuilderExtensions {  /// 
  /// Adds the  middleware to the specified , which enables WeChat authentication capabilities.  /// 
  /// The  to add the middleware to.  /// A reference to this instance after the operation has completed.  public static IApplicationBuilder UseWeChatAuthentication(this IApplicationBuilder app)  {   if (app == null)   {    throw new ArgumentNullException(nameof(app));   }   return app.UseMiddleware();  }  /// 
  /// Adds the  middleware to the specified , which enables WeChat authentication capabilities.  /// 
  /// The  to add the middleware to.  /// A  that specifies options for the middleware.  /// A reference to this instance after the operation has completed.  public static IApplicationBuilder UseWeChatAuthentication(this IApplicationBuilder app, WeChatOptions options)  {   if (app == null)   {    throw new ArgumentNullException(nameof(app));   }   if (options == null)   {    throw new ArgumentNullException(nameof(options));   }   return app.UseMiddleware(Options.Create(options));  } }}

WeChatDefaults.cs：

// Copyright (c) .NET Foundation. All rights reserved.// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.namespace Microsoft.AspNetCore.Authentication.WeChat{ public static class WeChatDefaults {  public const string AuthenticationScheme = "WeChat";  public static readonly string AuthorizationEndpoint = "https://open.weixin.qq.com/connect/oauth3/authorize";  public static readonly string TokenEndpoint = "https://api.weixin.qq.com/sns/oauth3/access_token";  public static readonly string UserInformationEndpoint = "https://api.weixin.qq.com/sns/userinfo"; }}

WeChatHandler.cs

// Copyright (c) .NET Foundation. All rights reserved.// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.using Microsoft.AspNetCore.Authentication.OAuth;using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.Http.Authentication;using Microsoft.AspNetCore.Http.Extensions;using Microsoft.Extensions.Primitives;using Newtonsoft.Json.Linq;using System;using System.Collections.Generic;using System.Net.Http;using System.Net.Http.Headers;using System.Security.Claims;using System.Text;using Microsoft.AspNetCore.Mvc;using System.Threading.Tasks;namespace Microsoft.AspNetCore.Authentication.WeChat{ internal class WeChatHandler : OAuthHandler {  public WeChatHandler(HttpClient httpClient)   : base(httpClient)  {  }  protected override async Task HandleRemoteAuthenticateAsync()  {   AuthenticationProperties properties = null;   var query = Request.Query;   var error = query["error"];   if (!StringValues.IsNullOrEmpty(error))   {    var failureMessage = new StringBuilder();    failureMessage.Append(error);    var errorDescription = query["error_description"];    if (!StringValues.IsNullOrEmpty(errorDescription))    {     failureMessage.Append(";Description=").Append(errorDescription);    }    var errorUri = query["error_uri"];    if (!StringValues.IsNullOrEmpty(errorUri))    {     failureMessage.Append(";Uri=").Append(errorUri);    }    return AuthenticateResult.Fail(failureMessage.ToString());   }   var code = query["code"];   var state = query["state"];   var oauthState = query["oauthstate"];   properties = Options.StateDataFormat.Unprotect(oauthState);   if (state != Options.StateAddition || properties == null)   {    return AuthenticateResult.Fail("The oauth state was missing or invalid.");   }   // OAuth3 10.12 CSRF   if (!ValidateCorrelationId(properties))   {    return AuthenticateResult.Fail("Correlation failed.");   }   if (StringValues.IsNullOrEmpty(code))   {    return AuthenticateResult.Fail("Code was not found.");   }   //获取tokens   var tokens = await ExchangeCodeAsync(code, BuildRedirectUri(Options.CallbackPath));   var identity = new ClaimsIdentity(Options.ClaimsIssuer);   AuthenticationTicket ticket = null;   if (Options.WeChatScope == Options.InfoScope)   {    //获取用户信息    ticket = await CreateTicketAsync(identity, properties, tokens);   }   else   {    //不获取信息，只使用openid    identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, tokens.TokenType, ClaimValueTypes.String, Options.ClaimsIssuer));    ticket = new AuthenticationTicket(new ClaimsPrincipal(identity), properties, Options.AuthenticationScheme);   }   if (ticket != null)   {    return AuthenticateResult.Success(ticket);   }   else   {    return AuthenticateResult.Fail("Failed to retrieve user information from remote server.");   }  }    /// 
  /// OAuth第一步,获取code  /// 
  ///   ///   ///   protected override string BuildChallengeUrl(AuthenticationProperties properties, string redirectUri)  {   //加密OAuth状态   var oauthstate = Options.StateDataFormat.Protect(properties);   //   redirectUri = $"{redirectUri}?{nameof(oauthstate)}={oauthstate}";   var queryBuilder = new QueryBuilder()   {    { "appid", Options.ClientId },    { "redirect_uri", redirectUri },    { "response_type", "code" },    { "scope", Options.WeChatScope },         { "state", Options.StateAddition },   };   return Options.AuthorizationEndpoint + queryBuilder.ToString();  }  /// 
  /// OAuth第二步,获取token  /// 
  ///   ///   ///   protected override async Task ExchangeCodeAsync(string code, string redirectUri)  {   var tokenRequestParameters = new Dictionary()   {    { "appid", Options.ClientId },    { "secret", Options.ClientSecret },    { "code", code },    { "grant_type", "authorization_code" },   };   var requestContent = new FormUrlEncodedContent(tokenRequestParameters);   var requestMessage = new HttpRequestMessage(HttpMethod.Post, Options.TokenEndpoint);   requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));   requestMessage.Content = requestContent;   var response = await Backchannel.SendAsync(requestMessage, Context.RequestAborted);   if (response.IsSuccessStatusCode)   {    var payload = JObject.Parse(await response.Content.ReadAsStringAsync());    string ErrCode = payload.Value("errcode");    string ErrMsg = payload.Value("errmsg");    if (!string.IsNullOrEmpty(ErrCode) | !string.IsNullOrEmpty(ErrMsg))    {     return OAuthTokenResponse.Failed(new Exception($"ErrCode:{ErrCode},ErrMsg:{ErrMsg}"));     }    var tokens = OAuthTokenResponse.Success(payload);    //借用TokenType属性保存openid    tokens.TokenType = payload.Value("openid");    return tokens;   }   else   {    var error = "OAuth token endpoint failure";    return OAuthTokenResponse.Failed(new Exception(error));   }  }  /// 
  /// OAuth第四步，获取用户信息  /// 
  ///   ///   ///   ///   protected override async Task CreateTicketAsync(ClaimsIdentity identity, AuthenticationProperties properties, OAuthTokenResponse tokens)  {   var queryBuilder = new QueryBuilder()   {    { "access_token", tokens.AccessToken },    { "openid", tokens.TokenType },//在第二步中，openid被存入TokenType属性    { "lang", "zh_CN" }   };   var infoRequest = Options.UserInformationEndpoint + queryBuilder.ToString();   var response = await Backchannel.GetAsync(infoRequest, Context.RequestAborted);   if (!response.IsSuccessStatusCode)   {    throw new HttpRequestException($"Failed to retrieve WeChat user information ({response.StatusCode}) Please check if the authentication information is correct and the corresponding WeChat Graph API is enabled.");   }   var user = JObject.Parse(await response.Content.ReadAsStringAsync());   var ticket = new AuthenticationTicket(new ClaimsPrincipal(identity), properties, Options.AuthenticationScheme);   var context = new OAuthCreatingTicketContext(ticket, Context, Options, Backchannel, tokens, user);   var identifier = user.Value("openid");   if (!string.IsNullOrEmpty(identifier))   {    identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, identifier, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var nickname = user.Value("nickname");   if (!string.IsNullOrEmpty(nickname))   {    identity.AddClaim(new Claim(ClaimTypes.Name, nickname, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var sex = user.Value("sex");   if (!string.IsNullOrEmpty(sex))   {    identity.AddClaim(new Claim("urn:WeChat:sex", sex, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var country = user.Value("country");   if (!string.IsNullOrEmpty(country))   {    identity.AddClaim(new Claim(ClaimTypes.Country, country, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var province = user.Value("province");   if (!string.IsNullOrEmpty(province))   {    identity.AddClaim(new Claim(ClaimTypes.StateOrProvince, province, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var city = user.Value("city");   if (!string.IsNullOrEmpty(city))   {    identity.AddClaim(new Claim("urn:WeChat:city", city, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var headimgurl = user.Value("headimgurl");   if (!string.IsNullOrEmpty(headimgurl))   {    identity.AddClaim(new Claim("urn:WeChat:headimgurl", headimgurl, ClaimValueTypes.String, Options.ClaimsIssuer));   }   var unionid = user.Value("unionid");   if (!string.IsNullOrEmpty(unionid))   {    identity.AddClaim(new Claim("urn:WeChat:unionid", unionid, ClaimValueTypes.String, Options.ClaimsIssuer));   }   await Options.Events.CreatingTicket(context);   return context.Ticket;  } }}

WeChatMiddleware.cs

// Copyright (c) .NET Foundation. All rights reserved.// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.using System;using System.Globalization;using System.Text.Encodings.Web;using Microsoft.AspNetCore.Authentication.OAuth;using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.DataProtection;using Microsoft.AspNetCore.Http;using Microsoft.Extensions.Logging;using Microsoft.Extensions.Options;namespace Microsoft.AspNetCore.Authentication.WeChat{ /// 
 /// An ASP.NET Core middleware for authenticating users using WeChat. /// 
 public class WeChatMiddleware : OAuthMiddleware {  /// 
  /// Initializes a new .  /// 
  /// The next middleware in the HTTP pipeline to invoke.  ///   ///   ///   ///   /// Configuration options for the middleware.  public WeChatMiddleware(   RequestDelegate next,   IDataProtectionProvider dataProtectionProvider,   ILoggerFactory loggerFactory,   UrlEncoder encoder,   IOptions sharedOptions,   IOptions options)   : base(next, dataProtectionProvider, loggerFactory, encoder, sharedOptions, options)  {   if (next == null)   {    throw new ArgumentNullException(nameof(next));   }   if (dataProtectionProvider == null)   {    throw new ArgumentNullException(nameof(dataProtectionProvider));   }   if (loggerFactory == null)   {    throw new ArgumentNullException(nameof(loggerFactory));   }   if (encoder == null)   {    throw new ArgumentNullException(nameof(encoder));   }   if (sharedOptions == null)   {    throw new ArgumentNullException(nameof(sharedOptions));   }   if (options == null)   {    throw new ArgumentNullException(nameof(options));   }   if (string.IsNullOrEmpty(Options.AppId))   {    throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, nameof(Options.AppId)));   }   if (string.IsNullOrEmpty(Options.AppSecret))   {    throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, nameof(Options.AppSecret)));   }  }  /// 
  /// Provides the  object for processing authentication-related requests.  /// 
  /// An  configured with the  supplied to the constructor.  protected override AuthenticationHandler CreateHandler()  {   return new WeChatHandler(Backchannel);  } }}

WeChatOptions.cs

// Copyright (c) .NET Foundation. All rights reserved.// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.using System.Collections.Generic;using Microsoft.AspNetCore.Authentication.WeChat;using Microsoft.AspNetCore.Http;using Microsoft.AspNetCore.Identity;namespace Microsoft.AspNetCore.Builder{ /// 
 /// Configuration options for . /// 
 public class WeChatOptions : OAuthOptions {  /// 
  /// Initializes a new .  /// 
  public WeChatOptions()  {   AuthenticationScheme = WeChatDefaults.AuthenticationScheme;   DisplayName = AuthenticationScheme;   CallbackPath = new PathString("/signin-wechat");   StateAddition = "#wechat_redirect";   AuthorizationEndpoint = WeChatDefaults.AuthorizationEndpoint;   TokenEndpoint = WeChatDefaults.TokenEndpoint;   UserInformationEndpoint = WeChatDefaults.UserInformationEndpoint;   //SaveTokens = true;      //BaseScope （不弹出授权页面，直接跳转，只能获取用户openid），   //InfoScope （弹出授权页面，可通过openid拿到昵称、性别、所在地。并且，即使在未关注的情况下，只要用户授权，也能获取其信息）   WeChatScope = InfoScope;  }  // WeChat uses a non-standard term for this field.  /// 
  /// Gets or sets the WeChat-assigned appId.  /// 
  public string AppId  {   get { return ClientId; }   set { ClientId = value; }  }  // WeChat uses a non-standard term for this field.  /// 
  /// Gets or sets the WeChat-assigned app secret.  /// 
  public string AppSecret  {   get { return ClientSecret; }   set { ClientSecret = value; }  }  public string StateAddition { get; set; }  public string WeChatScope { get; set; }  public string BaseScope = "snsapi_base";  public string InfoScope = "snsapi_userinfo"; }}

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