无法使用来自 Asp.Net 的代表流调用 graphAPI Web API

Question

我正在尝试在 Asp.net Web API （.net 5）中实现代表用户。 我从手机APP收到一个access_token，发送到我的Web API。 Web API 使用此令牌调用 GRAPH API 以获取用户的配置文件详细信息。 下面是我的代码 Startup.cs 文件

 services.AddAuthentication("JwtBearer")
                        .AddJwtBearer("JwtBearer", options =>
                        {
                            options.MetadataAddress = $"https://login.microsoftonline.com/{Configuration["b2bAzureAppIdentity:TenantId"]}/v2.0/.well-known/openid-configuration";
                            options.TokenValidationParameters = new TokenValidationParameters()
                            {
                                ValidIssuer = $"https://sts.windows.net/{Configuration["b2bAzureAppIdentity:TenantId"]}/",

                                // as audience, both the client id and the identifierUri are allowed (sematically equivalent)
                                ValidAudiences = new[] { Configuration["b2bAzureAppIdentity:AppIdUri"], Configuration["b2bAzureAppIdentity:ClientId"] }
                            };
                        }).AddMicrosoftIdentityWebApi(Configuration, "b2bAzureAppIdentity")
                        .EnableTokenAcquisitionToCallDownstreamApi()
                        .AddMicrosoftGraph(Configuration.GetSection("DownstreamApi"))
                        .AddInMemoryTokenCaches();

controller.cs

 [HttpGet("GetMyDetails")]
    [AuthorizeForScopes(Scopes = new string[] { "user.read" })]
    public async Task<IActionResult> GetMyDetails()
    {
        var user = await _graphServiceClient.Me.Request().GetAsync();
        return new OkObjectResult(user.Photo);
    }

Appsettings 采用以下格式

 "b2bAzureAppIdentity": {
"Instance": "https://login.microsoftonline.com/",
"Domain": "",
"TenantId": "",
"ClientId": "",
"ClientSecret": "",
"AppIdUri": ""},
 "DownstreamApi": {
"BaseUrl": "https://graph.microsoft.com/v1.0",
"Scopes": "user.read"},

In Azure, the API permissions and scope are set correctly, this is evident because when I make calls from postman, I'm able to get the accesstoken for on_behalf_of and use it to get the user's profile details by calling https://graph. microsoft.com/v1.0/me

在 controller 这一行

var user = await _graphServiceClient.Me.Request().GetAsync();

我收到一条错误消息：“没有向 AcquireTokenSilent 调用传递任何帐户或登录提示。”

我已经用谷歌搜索了这个错误，解决方案说用户应该同意 scope 但是它已经得到了 Azure 门户中的管理员的同意。 此外，这在 Postman 中工作的事实让人相信 APP 和 API 的配置是正确的。

有没有人遇到过类似的问题？

Answer 1

发生这种情况是因为收到的 access_token 没有与获取用户详细信息的请求一起发送。 以下是如何代表提供者实施的示例：

// Create a client application.
IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
                .Create(clientId)
                .WithTenantId(tenantID)
                // The Authority is a required parameter when your application is configured 
                // to accept authentications only from the tenant where it is registered.
                .WithAuthority(authority)
                .WithClientSecret(clientSecret)
                .Build();
                
// Use the API reference to determine which scopes are appropriate for your API request.
// e.g. - https://docs.microsoft.com/en-us/graph/api/user-get?view=graph-rest-1.0&tabs=http
var scopes = new string[] { "User.Read" };
// Create an authentication provider.
ClientCredentialProvider authenticationProvider = new OnBehalfOfProvider(confidentialClientApplication, scopes);

var jsonWebToken = actionContext.Request.Headers.Authorization.Parameter;
var userAssertion = new UserAssertion(jsonWebToken);
// Configure GraphServiceClient with provider.
GraphServiceClient graphServiceClient = new GraphServiceClient(authenticationProvider);
// Make a request
var me = await graphServiceClient.Me.Request().WithUserAssertion(userAssertion).GetAsync();

在这种情况下，令牌会在对WithUserAssertion的调用中添加到请求中。

请让我知道这是否有帮助，如果您还有其他问题。