OpenIddict使用教程

OpenIddict是一个ASP.NET Core身份验证库，可帮助您添加OpenID Connect和OAuth 2.0支持到ASP.NET Core应用程序中。下面是OpenIddict使用教程的步骤:

1. 安装OpenIddict，在项目中添加OpenIddict.Core和OpenIddict.EntityFrameworkCore Nuget包。

2. 配置OpenIddict，在Startup.cs文件中添加OpenIddict服务的配置。您可以选择使用内存或EFCore进行配置。以下是使用EF Core进行配置的示例：

services.AddDbContext<ApplicationDbContext>(options =>
{
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"));
    options.UseOpenIddict();
});

services.AddCustomOpenIddictApplication();
services.AddCustomOpenIddictAuthorization();
services.AddCustomOpenIddictScope();
services.AddCustomOpenIddictToken();
services.AddCustomOpenIddictValidation();
services.AddCustomOpenIddictUser();

services.AddOpenIddict()
    .AddCore(options =>
    {
        options.UseEntityFrameworkCore()
            .UseDbContext<ApplicationDbContext>()
            .ReplaceDefaultEntities<ApplicationDbContext>();
    })
    .AddServer(options =>
    {
        options.UseMvc();
        options.EnableAuthorizationEndpoint("/connect/authorize")
            .EnableLogoutEndpoint("/connect/logout")
            .EnableTokenEndpoint("/connect/token")
            .EnableUserinfoEndpoint("/connect/userinfo");
        options.RegisterScopes("openid", "profile", "email", "offline_access");

        options.AllowImplicitFlow();
        options.DisableHttpsRequirement();

        options.AddSigningCertificate(File.ReadAllBytes(Configuration["Auth:Certificates:Path"]),
            Configuration["Auth:Certificates:Password"]);

        options.DisableAccessTokenEncryption();
        options.SetAccessTokenLifetime(TimeSpan.FromHours(6));
    });

3. 添加授权策略，在Startup.cs文件添加需要的授权策略。以下是一个例子：

services.AddAuthorization(options =>
{
    options.AddPolicy("EmployeeOnly", policy => policy.RequireClaim("EmployeeNumber"));
    options.AddPolicy("AdministratorOnly", policy => policy.RequireRole("Administrator"));
});

4. 在您的应用程序中使用OpenIddict，您可以使用OpenIddict来实现您的OAuth 2.0或OpenID Connect需求。以下是一些常见的用例：

4.1 登录页面

使用OpenIddict进行身份验证，您可以使用如下代码在您的控制器中。您可以使用请求重定向到触发OpenID Connect流：

[HttpGet("~/login")]
public IActionResult Login()
{
    var request = HttpContext.GetOpenIddictServerRequest();
    
    return View(new LoginViewModel
    {
        Nonce = RandomNumberGenerator.GetInt32(),
        ReturnUrl = request.RedirectUri,
        Ticket = request.GetOpenIddictServerTransactionId(),
    });
}

[HttpPost("~/login")]
public IActionResult Login(LoginViewModel model)
{
    if (ModelState.IsValid)
    {
        var user = await _userManager.FindByNameAsync(model.Username);
        if (user == null)
        {
            ModelState.AddModelError("Username", "Username or password is incorrect.");
        }
        else if (!await _userManager.IsEmailConfirmedAsync(user))
        {
            ModelState.AddModelError("Email", "You must have a confirmed email to log in.");
        }
        else if (!await _userManager.CheckPasswordAsync(user, model.Password))
        {
            ModelState.AddModelError("Username", "Username or password is incorrect.");
        }
        else
        {
            // 创建一个新的身份验证票据.
            var ticket = await CreateTicketAsync(user);

            return SignIn(ticket.Principal, ticket.Properties, ticket.AuthenticationScheme);
        }
    }

    ViewData["returnUrl"] = model.ReturnUrl;
    ViewData["nonce"] = model.Nonce;
    ViewData["transactionId"] = model.Ticket;
    return View(model);
}

4.2 注册页面

您还可以使用OpenIddict来实现您的注册页面。以下是一个例子：

[HttpGet("~/register")]
public IActionResult Register()
{
    return View();
}

[HttpPost("~/register")]
public async Task<IActionResult> Register(RegisterViewModel model)
{
    if (ModelState.IsValid)
    {
        var user = new ApplicationUser
        {
            UserName = model.Email,
            Email = model.Email,
            FirstName = model.FirstName,
            LastName = model.LastName,
        };

        var result = await _userManager.CreateAsync(user, model.Password);
        if (result.Succeeded)
        {
            var code = await _userManager.GenerateEmailConfirmationAsync(user);
            var callbackUrl= Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: HttpContext.Request.Scheme);
            
            await _emailSender.SendEmailAsync(model.Email, "Confirm your email",
                $"Please confirm your account by clicking this link: {callbackUrl}");

            return RedirectToAction(nameof(RegisterConfirmation));
        }

        foreach (var error in result.Errors)
        {
            ModelState.AddModelError("Email", error.Description);
        }
    }

    return View(model);
}

[HttpGet("~/register/confirmation")]
public IActionResult RegisterConfirmation()
{
    return View();
}

4.3 访问受保护的资源

最后，您可以使用OpenIddict来实现访问受保护资源的身份验证和授权。以下是一个例子：

[HttpGet("~/manager")]
[Authorize(Roles = "Manager")]
public IActionResult ManagerDashboard()
{
    return View();
}

[HttpGet("~/employee")]
[Authorize(Policy = "EmployeeOnly")]
public IActionResult EmployeeDashboard()
{
    return View();
}

[HttpGet("~/administrator")]
[Authorize(Policy = "AdministratorOnly")]
public IActionResult AdministratorDashboard()
{
    return View();
}

5. 通过OpenIddict实现Token刷新

当访问受保护的API时，您可以使用OpenIddict来实现使用token刷新。以下是实现Token刷新的一个示例方法：

[HttpPost("~/api/token/refresh")]
public async Task<IActionResult> Refresh([FromForm]string refreshToken)
{
    var info = await HttpContext.AuthenticateAsync(OpenIddictServerDefaults.AuthenticationScheme);

    if (info == null)
    {
        return BadRequest(new
        {
            error = OpenIddictConstants.Errors.InvalidRequest,
            error_description = "The refresh token is no longer valid."
        });
    }

    var principal = info.Principal;

    var user = await _userManager.GetUserAsync(principal);
    if (user == null)
    {
        return BadRequest(new
        {
            error = OpenIddictConstants.Errors.InvalidRequest,
            error_description = "The refresh token is no longer valid."
        });
    }

    // 确保刷新令牌没有被撤销.
    if (!await _tokenManager.ValidateAsync(
        principal.GetId(),
        principal.GetClaim(OpenIddictConstants.Claims.JwtId)))
    {
        return BadRequest(new
        {
            error = OpenIddictConstants.Errors.InvalidRequest,
            error_description = "The refresh token is no longer valid."
        });
    }

    // 从数据库得到客户端应用程序详细信息
    var application = await _applicationManager.FindByClientIdAsync(
        principal.GetClaim(OpenIddictConstants.Claims.ClientId));
    if (application == null)
    {
        return BadRequest(new
        {
            error = OpenIddictConstants.Errors.InvalidRequest,
            error_description = "The client application associated with this token is no longer valid."
        });
    }

    var identity = await _userManager.CreateIdentityAsync(user, principal.GetScopes());

    var ticket = await CreateTicketAsync(application, identity, principal);

    return SignIn(ticket.Principal, ticket.Properties, ticket.AuthenticationScheme);
}

6. 通过OpenIddict实现密码恢复流程OpenIddict还可以实现忘记密码流程的重置密码，以下是一个简单的示例：

[HttpPost("~/forgot-password")]
[AllowAnonymous]
public async Task<IActionResult> ForgotPassword([FromForm] string email)
{
    var user = await _userManager.FindByEmailAsync(email);
    if (user == null)
    {
        // Don't reveal that the user does not exist or is not confirmed
        return Ok();
    }

    var code = await _userManager.GeneratePasswordResetTokenAsync(user);
    code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));

    var callbackUrl = Url.Action("ResetPassword", "Account", new { userId = user.Id, code = code }, protocol: HttpContext.Reque

    await _emailSender.SendEmailAsync(
        email,
        "Password Reset",
        $"Please reset your password by clicking here: <a href='{HtmlEncoder.Default.Encode(callbackUrl)}'>link</a>.");

    return Ok();
}

[HttpGet("~/reset-password")]
[AllowAnonymous]
public IActionResult ResetPassword(string code = null, string userId = null)
{
    return View(new ResetPasswordViewModel { Code = code, UserId = userId });
}

[HttpPost("~/reset-password")]
[AllowAnonymous]
public async Task<IActionResult> ResetPassword([FromForm] ResetPasswordViewModel model)
{
    if (!ModelState.IsValid)
    {
        return View(model);
    }

    var user = await _userManager.FindByIdAsync(model.UserId);
    if (user == null)
    {
        // Don't reveal that the user does not exist
        return View("ResetPasswordConfirmation");
    }

    var decodedCode = Encoding.UTF8.GetString(WebEncoders.Base64UrlDecode(model.Code));
    var result = await _userManager.ResetPasswordAsync(user, decodedCode, model.Password);
    if (result.Succeeded)
    {
        return RedirectToAction(nameof(ResetPasswordConfirmation));
    }

    foreach (var error in result.Errors)
    {
        ModelState.AddModelError(string.Empty, error.Description);
    }

    return View(model);
}

[HttpGet("~/reset-password-confirmation")]
[AllowAnonymous]
public IActionResult ResetPasswordConfirmation()
{
    return View();
}

7. 使用OpenIddict实现自定义Token发布方案

OpenIddict支持自定义Token发布方案，以适应各种需求。在以下示例中，我们将实现自定义发布方案来控制Token的过期时间：

public class CustomTokenEndpointHandler : OpenIddictServerHandler<OpenIddictServerOptions>
{
    public CustomTokenEndpointHandler(IServiceProvider services)
        : base(services)
    {
    }

    public override async Task HandleAsync([NotNull] OpenIddictServerHandleContext context)
    {
        if (context == null)
        {
            throw new ArgumentNullException(nameof(context));
        }

        // 从数据库检索客户机应用程序.
        var application = await context.HttpContext.GetOpenIddictServerApplicationAsync();
        if (application == null)
        {
            throw new InvalidOperationException("The client application cannot be retrieved.");
        }

        // Retrieve the user principal from the authorization server settings.
        var principal = context.HttpContext.User;

        // Ensure that the application is allowed to use the specified grant type.
        if (!await ValidateClientRedirectUriAsync(application, context.Request))
        {
            throw new InvalidOperationException("The grant type is not allowed for this application.");
        }

        // Note: the "scopes" parameter is always ignored by this custom token endpoint
        // and the claims are automatically defined based on the granted scopes/roles.

        var ticket = new AuthenticationTicket(principal, new AuthenticationProperties(),
            OpenIddictServerDefaults.AuthenticationScheme);
            
        // Customize the token lifetime based on the custom grant type requested.
        if (string.Equals(context.Request.GrantType, "urn:custom_grant", StringComparison.OrdinalIgnoreCase))
        {
            // Set the token expiration to 1 hour.
            ticket.Properties.ExpiresUtc = context.Options.SystemClock.UtcNow.AddHours(1);
        }
        else
        {
            // Set the token expiration to the default duration (5 minutes)
            ticket.Properties.ExpiresUtc = context.Options.SystemClock.UtcNow.Add(
                context.Options.AccessTokenLifetime ?? TimeSpan.FromMinutes(5));
        }

        context.Logger.LogInformation("The custom token request was successfully processed.");

        await context.HttpContext.SignInAsync(ticket.Principal, ticket.Properties, ticket.AuthenticationScheme);

        // Mark the response as handled to skip the rest of the pipeline.
        context.HandleRequest();
    }
}

您需要将其添加到OpenIddict配置中：

services.AddOpenIddict()
    .AddCore(options =>
    {
        // ...
    })
    .AddServer(options =>{
    // ...
    
    options.Handlers.Add(new CustomTokenEndpointHandler(services));
    
    // ...
})
.AddValidation(options =>
{
    // ...
});

此时，您可以使用urn:custom_grant授权类型来发出过期时间为1小时的Token，这可以通过以下方式完成：

var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost:5000/connect/token");
request.Content = new FormUrlEncodedContent(new Dictionary<string, string>
{
    ["grant_type"] = "urn:custom_grant",
    ["client_id"] = "your_client_id",
    ["client_secret"] = "your_client_secret",
    ["scope"] = "your_scopes_separated_by_spaces"
});

var response = await client.SendAsync(request);
var payload = await response.Content.ReadAsStringAsync();

总结

本文介绍了如何使用OpenIddict创建一个基本的身份验证和授权服务器。当然，在实现身份验证和授权服务器时有很多细节需要考虑，例如维护安全性、处理错误、管理用户和客户端应用程序等。希望这篇文章对您有所帮助！