将访问令牌作为 URL 查询参数传递？

Question

我正在创建一个机器人，我必须在其中发送带有从 Microsoft Graph 获得的图像的 HeroCard。问题是我无法通过这种方式发送访问令牌来获取图像。

我在 CardImage 的构造函数中传递了图像 URL。没有其他构造函数或函数可以修改它，所以我无法像往常一样获取带有令牌的图像，然后将其发送到 CardImage。

有没有办法将令牌作为 url 查询字符串传递？我知道不建议这样做，那么还有其他方法可以完成吗？ 感谢您的帮助

Answer 1

我不相信有办法做到这一点，除非您以某种方式拦截客户端中的 http 请求并添加 Authorization: Bearer <token> 标头。

但是，MSGraph Sample 可以使用一种解决方法。

1. Prompt the user to log in

2. Get the photo, using the token 和keep the base64 string of the photo。

3. 将 base64 字符串添加到 CardImage.Url 属性。

   • 它接受 base64 字符串，只要它的格式为："data:image/png;base64,<base64String>"
   • This answer 可以帮助你完成这部分

---

为了后代，每个步骤的相关代码

步骤 1

在对话框构造函数中：

AddDialog(new OAuthPrompt(
    nameof(OAuthPrompt),
    new OAuthPromptSettings
    {
        ConnectionName = ConnectionName,
        Text = "Please login",
        Title = "Login",
        Timeout = 300000, // User has 5 minutes to login
    }));

第一步：

private async Task<DialogTurnResult> PromptStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    return await stepContext.BeginDialogAsync(nameof(OAuthPrompt), null, cancellationToken);
}

下一步：

private async Task<DialogTurnResult> LoginStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    // Get the token from the previous step. Note that we could also have gotten the
    // token directly from the prompt itself. There is an example of this in the next method.
    var tokenResponse = (TokenResponse)stepContext.Result;
    if (tokenResponse != null)
    {
        await stepContext.Context.SendActivityAsync(MessageFactory.Text("You are now logged in."), cancellationToken);
        return await stepContext.PromptAsync(nameof(TextPrompt), new PromptOptions { Prompt = MessageFactory.Text("Would you like to do? (type 'me', 'send <EMAIL>' or 'recent')") }, cancellationToken);
    }

    await stepContext.Context.SendActivityAsync(MessageFactory.Text("Login was not successful please try again."), cancellationToken);
    return await stepContext.EndDialogAsync();
}

现在我们有了令牌。

第二步

// Gets the user's photo
public async Task<PhotoResponse> GetPhotoAsync()
{
    HttpClient client = new HttpClient();
    client.DefaultRequestHeaders.Add("Authorization", "Bearer " + _token);
    client.DefaultRequestHeaders.Add("Accept", "application/json");

    using (var response = await client.GetAsync("https://graph.microsoft.com/v1.0/me/photo/$value"))
    {
        if (!response.IsSuccessStatusCode)
        {
            throw new HttpRequestException($"Graph returned an invalid success code: {response.StatusCode}");
        }

        var stream = await response.Content.ReadAsStreamAsync();
        var bytes = new byte[stream.Length];
        stream.Read(bytes, 0, (int)stream.Length);

        var photoResponse = new PhotoResponse
        {
            Bytes = bytes,
            ContentType = response.Content.Headers.ContentType?.ToString(),
        };

        if (photoResponse != null)
        {
            photoResponse.Base64String = $"data:{photoResponse.ContentType};base64," +
                                            Convert.ToBase64String(photoResponse.Bytes);
        }

        return photoResponse;
    }
}

第三步

public static string ImageToBase64()
{
    var path = System.Web.HttpContext.Current.Server.MapPath(@"~\imgs\testpic.PNG");
    Byte[] bytes = File.ReadAllBytes(path);
    string base64String = Convert.ToBase64String(bytes);

    return "data:image/png;base64," + base64String;
}

[...]

var imgUrl = ImageToBase64();
var cardImages = new List<CardImage>();
cardImages.Add(new CardImage(url: imgUrl));

var heroCard = new HeroCard
{
    Title = "BotFramework Hero Card",
    Subtitle = "Microsoft Bot Framework",
    Text = "Build and connect intelligent bots to interact with your users naturally wherever they are," +
            " from text/sms to Skype, Slack, Office 365 mail and other popular services.",
    Images = cardImages,
    Buttons = new List<CardAction> { new CardAction(ActionTypes.OpenUrl, "Get Started", value: "https://docs.microsoft.com/bot-framework") },
};

var attachment = heroCard.ToAttachment();
var message = MessageFactory.Attachment(attachment);
await context.PostAsync(message);