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我正在编写一个 Asp.Net Core 2.2 应用程序,我在其中添加了 HttpClient。

        services.AddAuthentication(o => {
            o.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            o.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            o.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
        })
            .AddQuickbooksOnline(o => {
                o.ClientId = Configuration["ecm.qbo.client-id"];
                o.ClientSecret = Configuration["ecm.qbo.client-secret"];
                o.Scope.Add(QuickbooksOnlineScopes.Accounting);
            });

        services.AddHttpClient("qbo", c => {
            c.BaseAddress = new Uri("https://sandbox-quickbooks.api.intuit.com");
            c.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            c.DefaultRequestHeaders.Add("content-type", "application/json");
            c.DefaultRequestHeaders.Authorization=// How do I get the token to be assigned here?
        });

        service.AddScoped<IInventoryService, QboInventoryService>();

所以,基本上我给自己写了一个扩展,它允许我使用最少的配置进行 AddQuickbooksOnline 身份验证,因为扩展默认会进行许多配置。

在我的应用程序注册并通过身份验证后,我会向经过身份验证的用户显示一个 GetProducts 按钮。

我希望这个按钮调用我的 ProductController。

public class ProductController : ControllerBase {
    private readonly IInventoryService _inventoryService;
    public ProductController(IInventoryService inventoryService) {
        _inventoryService=inventoryService??throw new ArgumentNullException(nameof(inventoryService));
    }

    public async Task<IEnumerable<Product>> Get() {
        var products=await _inventoryService.GetAllProducts();
        return products;
    }
}

并且该服务实际上取决于我要在我的服务配置中添加的已配置 HttpClient。

public class QboInventoryService : IInventoryService {
    private readonly IHttpClientFactory _clientFactory;
    private readonly IConfiguration _config;
    public QboInventoryService(IHttpClientFactory clientFactory, IConfiguration config) {
        _clientFactory=clientFactory??throw new ArgumentNullException(nameof(clientFactory));
        _config=config??throw new ArgumentNullException(nameof(config));
    }

    public async Task<IEnumerable<Product>> GetAllProducts() {
        IEnumerable<Product> products=new List<Product>();

        var client=_clientFactory.CreateClient("qbo");
        var response=await client.GetAsync(config["qbo.products.query"]);

        if(response.IsSuccessStatusCode) {
            var content=await response.Content.ReadAsStringAsync();
            products=JsonConvert.DeserializeObject<IEnumerable<Product>>(content);
        }

        return products;
    }
}

因此,为了调用 QBO WebAPI,我需要将经过身份验证的用户的 OAuth 令牌提供给正在实例化的 HttpClient。

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