我正在创建一个机器人,我必须在其中发送带有从Microsoft Graph获取的图像的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的构造函数中传递图像URL。没有其他构造函数或函数可以对其进行修改,因此我无法像通常那样获得带有令牌的图像,然后将其发送到CardImage。
是否可以将令牌作为url查询字符串传递?我知道不推荐这样做,所以还有另一种方法可以做到这一点吗? 谢谢您的帮助
答案 0 :(得分:0)
除非您以某种方式拦截客户端中的http请求并添加Authorization: Bearer <token>
头,否则我不认为有办法。
但是,有MSGraph Sample种用途的解决方法。
Get the photo, using the token和keep the base64 string of the photo。
将base64字符串添加到CardImage.Url
属性中。
"data:image/png;base64,<base64String>"
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。
// 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;
}
}
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);