ASP.NET Core 5 WebAPI - Azure AD - 调用图 API 使用 Azure 广告访问令牌

Question

我使用 .NET 5 创建了一个 WebAPI，使用 Azure AD 对用户进行身份验证。我正在使用 Postman 生成访问令牌，WebAPI 在将访问令牌作为 Bearer 传递时工作。

我想调用 Graph API 以使用访问令牌获取用户日历和个人资料，但无法这样做。我已经关注了下面提到的几篇文章，但没有运气。

使用访问令牌调用 /me Graph 时出现无效的身份验证令牌错误API

应用程序注册以仅使用我的组织。我已将委派权限添加到 Graph API.

使用 Expose An API 创建自定义作用域，因为 WebAPI 抛出签名无效错误。

My WebAPI 在 StartUp.cs 代码中配置服务：

services.AddMicrosoftIdentityWebApiAuthentication(Configuration);

我的AppSettings.json

  "AzureAd": {
    "Instance": "https://login.microsoftonline.com/",
    "Domain": "<Domain",
    "ClientId": "<ClientId>",
    "TenantId": "<TenantId>"
  },

我已经尝试关注几篇建议 On Behalf Of Flow 的文章

https://joonasw.net/view/azure-ad-on-behalf-of-aspnet-core

我迷路了非常感谢任何帮助。

编辑 1：

我尝试实施 Farid 建议的解决方案。 邮递员输出返回 HTML 登录响应。它是 ASP.NET Core 5 WebAPI 所以我将 ConfigureServices 代码更改为以下内容：

services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)              
         .AddMicrosoftIdentityWebApi(Configuration.GetSection("AzureAd"))
         .EnableTokenAcquisitionToCallDownstreamApi()
         .AddMicrosoftGraph(Configuration.GetSection("DownstreamApi"))
         .AddInMemoryTokenCaches();

我收到以下错误。

System.InvalidOperationException: No authenticationScheme was specified, and there was no DefaultChallengeScheme found. The default schemes can be set using either AddAuthentication(string defaultScheme) or AddAuthentication(Action<AuthenticationOptions> configureOptions).
   at Microsoft.AspNetCore.Authentication.AuthenticationService.ChallengeAsync(HttpContext context, String scheme, AuthenticationProperties properties)
   at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(RequestDelegate next, HttpContext context, AuthorizationPolicy policy, PolicyAuthorizationResult authorizeResult)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

更新：

我能够使用以下代码解决错误：

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)                 .AddMicrosoftIdentityWebApi(Configuration.GetSection("AzureAd"))
.EnableTokenAcquisitionToCallDownstreamApi()                    .AddMicrosoftGraph(Configuration.GetSection("DownstreamApi"))
.AddInMemoryTokenCaches();

我可以阅读我的个人资料，但无法获取日历项目。这可能是由于管理员同意要求。

Answer 1

根据您提供的信息，您的令牌似乎已过期，因此首先尝试重新生成该令牌，此外，您添加了 Delegated permissions 没关系，但我怀疑您在添加 Graph API许可。所以它是强制性的，请仔细检查。请参阅下面的屏幕截图。请按照以下步骤使用 Microsoft Graph API

获取令牌和用户信息

授予管理员同意：

代币获取示例：

检查 appsettings.json 它应该如下所示：

{
  "AzureAd": {
    "Instance": "https://login.microsoftonline.com/",
    "Domain": "yourdemain.onmicrosoft.com",
    "TenantId": "",
    "ClientId": "",
    "ClientSecret": "",
    "ClientCertificates": [
    ],
    "CallbackPath": "/signin-oidc"
  },
  "DownstreamApi": {

    "BaseUrl": "https://graph.microsoft.com/v1.0",
    "Scopes": "https://graph.microsoft.com/.default"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

Startup.cs

  public void ConfigureServices(IServiceCollection services)
        {
            string[] initialScopes = Configuration.GetValue<string>("DownstreamApi:Scopes")?.Split(' ');

            services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
                .AddMicrosoftIdentityWebApp(Configuration.GetSection("AzureAd"))
                .EnableTokenAcquisitionToCallDownstreamApi(initialScopes)
                .AddMicrosoftGraph(Configuration.GetSection("DownstreamApi"))
                .AddInMemoryTokenCaches();

            services.AddControllersWithViews(options =>
            {
                var policy = new AuthorizationPolicyBuilder()
                    .RequireAuthenticatedUser()
                    .Build();
                options.Filters.Add(new AuthorizeFilter(policy));
            });
            services.AddRazorPages()
                    .AddMicrosoftIdentityUI();
        }

Note: You can ignore below two service from the ConfigureServices under startup.cs .EnableTokenAcquisitionToCallDownstreamApi(initialScopes) .AddMicrosoftGraph(Configuration.GetSection("DownstreamApi")) because I am using Graph API SDK and reading scope from appsettings.json so in the sample I am using local scope for your test case. So its not required or upto you.

控制器操作：

public async Task<object> GetUserInfoFromGraphAPI()
        {

            try
            {

                //Initialize on behalf of user token aquisition service

                var _tokenAcquisition = this.HttpContext.RequestServices.GetRequiredService<ITokenAcquisition>() as ITokenAcquisition;

                //define the scope
                string[] scopes = new string[] { "https://graph.microsoft.com/.default" };

                //Getting token from Azure Active Directory
                string accessToken = await _tokenAcquisition.GetAccessTokenForUserAsync(scopes);

                //Request Grap API end point
                HttpClient _client = new HttpClient();
                HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, string.Format("https://graph.microsoft.com/v1.0/me"));

                //Passing Token For this Request
                request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
                HttpResponseMessage response = await _client.SendAsync(request);

                //Get User into from grpah API
                dynamic userInfo = JsonConvert.DeserializeObject<dynamic>(await response.Content.ReadAsStringAsync());


                return userInfo;
            }
            catch (Exception ex)
            {

                throw;
            }

        }

输出：

Note: For complete solution please visit the GitHub Link

希望它能帮助您实现目标。