This article mainly introduces the relevant information about ASP.NET Core integrating WeChat login, which has certain reference value. Interested friends can refer to

Tools:

Visual Studio 2015 update 3

Asp.Net Core 1.0

1 Preparation

Apply for a WeChat public platform interface test account, Application URL: (mp.weixin.qq.com/debug/cgi-bin/sandbox?t=sandbox/login). No public account is required to apply for an interface test account, and you can directly experience and test all advanced interfaces of the public platform.

1.1 Configure interface information

##1.2 Modify web page authorization information

Click "Modify" and fill in your website domain name on the pop-up page:

2 Create a new website project

2.1 Select the ASP.NET Core Web Application template

2.2 Select the Web application and change the authentication to a personal user account

3 Integrate WeChat login function

3.1 Add reference

Open the project.json file and add reference Microsoft.AspNetCore.Authentication.OAuth

3.2 Add code files

Create a new folder in the project, name it WeChatOAuth, and add the code file (all codes are attached at the end of this article).

3.3 Register WeChat login middleware

Open the Startup.cs file and add the code in Configure ：

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

 AppSecret = "******"

});

Note that the insertion position of this code must be below app.UseIdentity().

4 Code

##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
{
 /// <summary>
 /// Extension methods to add WeChat authentication capabilities to an HTTP application pipeline.
 /// </summary>
 public static class WeChatAppBuilderExtensions
 {
  /// <summary>
  /// Adds the <see cref="WeChatMiddleware"/> middleware to the specified <see cref="IApplicationBuilder"/>, which enables WeChat authentication capabilities.
  /// </summary>
  /// <param name="app">The <see cref="IApplicationBuilder"/> to add the middleware to.</param>
  /// <returns>A reference to this instance after the operation has completed.</returns>
  public static IApplicationBuilder UseWeChatAuthentication(this IApplicationBuilder app)
  {
   if (app == null)
   {
    throw new ArgumentNullException(nameof(app));
   }

   return app.UseMiddleware<WeChatMiddleware>();
  }

  /// <summary>
  /// Adds the <see cref="WeChatMiddleware"/> middleware to the specified <see cref="IApplicationBuilder"/>, which enables WeChat authentication capabilities.
  /// </summary>
  /// <param name="app">The <see cref="IApplicationBuilder"/> to add the middleware to.</param>
  /// <param name="options">A <see cref="WeChatOptions"/> that specifies options for the middleware.</param>
  /// <returns>A reference to this instance after the operation has completed.</returns>
  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<WeChatMiddleware>(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/oauth2/authorize";

  public static readonly string TokenEndpoint = "https://api.weixin.qq.com/sns/oauth2/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<WeChatOptions>
 {
  public WeChatHandler(HttpClient httpClient)
   : base(httpClient)
  {
  }


  protected override async Task<AuthenticateResult> 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.");
   }

   // OAuth2 10.12 CSRF
   if (!ValidateCorrelationId(properties))
   {
    return AuthenticateResult.Fail("Correlation failed.");
   }

   if (StringValues.IsNullOrEmpty(code))
   {
    return AuthenticateResult.Fail("Code was not found.");
   }

   //獲取tokens
   var tokens = await ExchangeCodeAsync(code, BuildRedirectUri(Options.CallbackPath));

   var identity = new ClaimsIdentity(Options.ClaimsIssuer);

   AuthenticationTicket ticket = null;

   if (Options.WeChatScope == Options.InfoScope)
   {
    //獲取用戶信息
    ticket = await CreateTicketAsync(identity, properties, tokens);
   }
   else
   {
    //不獲取信息，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.");
   }
  }

  
  /// <summary>
  /// OAuth第一步,獲取code
  /// </summary>
  /// <param name="properties"></param>
  /// <param name="redirectUri"></param>
  /// <returns></returns>
  protected override string BuildChallengeUrl(AuthenticationProperties properties, string redirectUri)
  {
   //加密OAuth狀態(tài)
   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();
  }



  /// <summary>
  /// OAuth第二步,獲取token
  /// </summary>
  /// <param name="code"></param>
  /// <param name="redirectUri"></param>
  /// <returns></returns>
  protected override async Task<OAuthTokenResponse> ExchangeCodeAsync(string code, string redirectUri)
  {
   var tokenRequestParameters = new Dictionary<string, string>()
   {
    { "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<string>("errcode");
    string ErrMsg = payload.Value<string>("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屬性保存openid
    tokens.TokenType = payload.Value<string>("openid");

    return tokens;
   }
   else
   {
    var error = "OAuth token endpoint failure";
    return OAuthTokenResponse.Failed(new Exception(error));
   }
  }

  /// <summary>
  /// OAuth第四步，獲取用戶信息
  /// </summary>
  /// <param name="identity"></param>
  /// <param name="properties"></param>
  /// <param name="tokens"></param>
  /// <returns></returns>
  protected override async Task<AuthenticationTicket> 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屬性
    { "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<string>("openid");
   if (!string.IsNullOrEmpty(identifier))
   {
    identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, identifier, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var nickname = user.Value<string>("nickname");
   if (!string.IsNullOrEmpty(nickname))
   {
    identity.AddClaim(new Claim(ClaimTypes.Name, nickname, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var sex = user.Value<string>("sex");
   if (!string.IsNullOrEmpty(sex))
   {
    identity.AddClaim(new Claim("urn:WeChat:sex", sex, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var country = user.Value<string>("country");
   if (!string.IsNullOrEmpty(country))
   {
    identity.AddClaim(new Claim(ClaimTypes.Country, country, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var province = user.Value<string>("province");
   if (!string.IsNullOrEmpty(province))
   {
    identity.AddClaim(new Claim(ClaimTypes.StateOrProvince, province, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var city = user.Value<string>("city");
   if (!string.IsNullOrEmpty(city))
   {
    identity.AddClaim(new Claim("urn:WeChat:city", city, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var headimgurl = user.Value<string>("headimgurl");
   if (!string.IsNullOrEmpty(headimgurl))
   {
    identity.AddClaim(new Claim("urn:WeChat:headimgurl", headimgurl, ClaimValueTypes.String, Options.ClaimsIssuer));
   }

   var unionid = user.Value<string>("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
{
 /// <summary>
 /// An ASP.NET Core middleware for authenticating users using WeChat.
 /// </summary>
 public class WeChatMiddleware : OAuthMiddleware<WeChatOptions>
 {
  /// <summary>
  /// Initializes a new <see cref="WeChatMiddleware"/>.
  /// </summary>
  /// <param name="next">The next middleware in the HTTP pipeline to invoke.</param>
  /// <param name="dataProtectionProvider"></param>
  /// <param name="loggerFactory"></param>
  /// <param name="encoder"></param>
  /// <param name="sharedOptions"></param>
  /// <param name="options">Configuration options for the middleware.</param>
  public WeChatMiddleware(
   RequestDelegate next,
   IDataProtectionProvider dataProtectionProvider,
   ILoggerFactory loggerFactory,
   UrlEncoder encoder,
   IOptions<SharedAuthenticationOptions> sharedOptions,
   IOptions<WeChatOptions> 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)));
   }
  }

  /// <summary>
  /// Provides the <see cref="AuthenticationHandler{T}"/> object for processing authentication-related requests.
  /// </summary>
  /// <returns>An <see cref="AuthenticationHandler{T}"/> configured with the <see cref="WeChatOptions"/> supplied to the constructor.</returns>
  protected override AuthenticationHandler<WeChatOptions> 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
{
 /// <summary>
 /// Configuration options for <see cref="WeChatMiddleware"/>.
 /// </summary>
 public class WeChatOptions : OAuthOptions
 {
  /// <summary>
  /// Initializes a new <see cref="WeChatOptions"/>.
  /// </summary>
  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 （不彈出授權(quán)頁面，直接跳轉(zhuǎn)，只能獲取用戶openid），
   //InfoScope （彈出授權(quán)頁面，可通過openid拿到昵稱、性別、所在地。并且，即使在未關(guān)注的情況下，只要用戶授權(quán)，也能獲取其信息）
   WeChatScope = InfoScope;
  }

  // WeChat uses a non-standard term for this field.
  /// <summary>
  /// Gets or sets the WeChat-assigned appId.
  /// </summary>
  public string AppId
  {
   get { return ClientId; }
   set { ClientId = value; }
  }

  // WeChat uses a non-standard term for this field.
  /// <summary>
  /// Gets or sets the WeChat-assigned app secret.
  /// </summary>
  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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