我正在使用Bot Framework在C＃中开发一个bot，我想获取用户发送的附件。
它们似乎位于与此类似的位置：
ContentType: audio
ContentURL: https://smba.trafficmanager.net/apis/v3/attachments/0-weu-d9-734cab9e78c28a1619a39ce8c69342d1/views/original
Name: 2-audioMessage.m4a
当我收到请求时，它会向我显示以下内容：
{"message":"Authorization has been denied for this request."}
我怎样才能获得附件？ （在我的例子中，它们是Skype中的语音笔记）。
谢谢。
这是附件处理程序的详细类实现。请查看并进一步参考，请下载以下示例
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Bot.Builder;
using Microsoft.Bot.Connector;
using Microsoft.Bot.Schema;
namespace Microsoft.BotBuilderSamples
{
/// <summary>
/// Represents a bot that processes incoming activities.
/// For each user interaction, an instance of this class is created and the OnTurnAsync method is called.
/// This is a Transient lifetime service. Transient lifetime services are created
/// each time they're requested. For each Activity received, a new instance of this
/// class is created. Objects that are expensive to construct, or have a lifetime
/// beyond the single turn, should be carefully managed.
/// For example, the <see cref="MemoryStorage"/> object and associated
/// <see cref="IStatePropertyAccessor{T}"/> object are created with a singleton lifetime.
/// This bot responds to the user's text input with an <see cref="Attachment"/> (in this example, an image)
/// using various types of attachments. In this case, we are displaying an image from a file on the server,
/// an image from an HTTP URL, and an uploaded image. In this project the user also has the option to upload
/// an <see cref="Attachment"/> to the bot. The <see cref="Attachment"/> saves to the same directory as the
/// AttachmentBot.cs file. A message exchange between user and bot may contain media attachments, such as images,
/// video, audio, and files. The types of attachments that can be sent and received varies by channel. In this
/// sample we demonstrate sending a <see cref="HeroCard"/> and images as attachments. Also demonstrated is the
/// ability of a bot to receive file attachments.
/// </summary>
/// <seealso cref="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-2.1"/>
public class AttachmentsBot : IBot
{
/// <summary>
/// Every conversation turn for our Echo Bot will call this method.
/// There are no dialogs used, since it's "single turn" processing, meaning a single
/// request and response.
/// </summary>
/// <param name="turnContext">A <see cref="ITurnContext"/> containing all the data needed
/// for processing this conversation turn. </param>
/// <param name="cancellationToken">(Optional) A <see cref="CancellationToken"/> that can be used by other objects
/// or threads to receive notice of cancellation.</param>
/// <returns>A <see cref="Task"/> that represents the work queued to execute.</returns>
/// <seealso cref="BotStateSet"/>
/// <seealso cref="ConversationState"/>
/// <seealso cref="IMiddleware"/>
public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
{
if (turnContext == null)
{
throw new ArgumentNullException(nameof(turnContext));
}
if (turnContext.Activity.Type == ActivityTypes.Message)
{
// Take the input from the user and create the appropriate response.
var reply = ProcessInput(turnContext);
// Respond to the user.
await turnContext.SendActivityAsync(reply, cancellationToken);
await DisplayOptionsAsync(turnContext, cancellationToken);
}
else if (turnContext.Activity.Type == ActivityTypes.ConversationUpdate)
{
if (turnContext.Activity.MembersAdded != null)
{
// Send a welcome message to the user and tell them what actions they may perform to use this bot
await SendWelcomeMessageAsync(turnContext, cancellationToken);
}
}
else
{
// Default behavior for all other type of activities.
await turnContext.SendActivityAsync($"{turnContext.Activity.Type} activity detected");
}
}
/// <summary>
/// Displays a <see cref="HeroCard"/> with options for the user to select.
/// </summary>
/// <param name="turnContext">Provides the <see cref="ITurnContext"/> for the turn of the bot.</param>
/// <param name="cancellationToken" >(Optional) A <see cref="CancellationToken"/> that can be used by other objects
/// or threads to receive notice of cancellation.</param>
/// <returns>A <see cref="Task"/> representing the operation result of the operation.</returns>
private static async Task DisplayOptionsAsync(ITurnContext turnContext, CancellationToken cancellationToken)
{
var reply = turnContext.Activity.CreateReply();
// Create a HeroCard with options for the user to interact with the bot.
var card = new HeroCard
{
Text = "You can upload an image or select one of the following choices",
Buttons = new List<CardAction>
{
// Note that some channels require different values to be used in order to get buttons to display text.
// In this code the emulator is accounted for with the 'title' parameter, but in other channels you may
// need to provide a value for other parameters like 'text' or 'displayText'.
new CardAction(ActionTypes.ImBack, title: "1. Inline Attachment", value: "1"),
new CardAction(ActionTypes.ImBack, title: "2. Internet Attachment", value: "2"),
new CardAction(ActionTypes.ImBack, title: "3. Uploaded Attachment", value: "3"),
},
};
// Add the card to our reply.
reply.Attachments = new List<Attachment>() { card.ToAttachment() };
await turnContext.SendActivityAsync(reply, cancellationToken);
}
/// <summary>
/// Greet the user and give them instructions on how to interact with the bot.
/// </summary>
/// <param name="turnContext">Provides the <see cref="ITurnContext"/> for the turn of the bot.</param>
/// <param name="cancellationToken" >(Optional) A <see cref="CancellationToken"/> that can be used by other objects
/// or threads to receive notice of cancellation.</param>
/// <returns>A <see cref="Task"/> representing the operation result of the operation.</returns>
private static async Task SendWelcomeMessageAsync(ITurnContext turnContext, CancellationToken cancellationToken)
{
foreach (var member in turnContext.Activity.MembersAdded)
{
if (member.Id != turnContext.Activity.Recipient.Id)
{
await turnContext.SendActivityAsync(
$"Welcome to AttachmentsBot {member.Name}." +
$" This bot will introduce you to Attachments." +
$" Please select an option",
cancellationToken: cancellationToken);
await DisplayOptionsAsync(turnContext, cancellationToken);
}
}
}
/// <summary>
/// Given the input from the message <see cref="Activity"/>, create the response.
/// </summary>
/// <param name="turnContext">Provides the <see cref="ITurnContext"/> for the turn of the bot.</param>
/// <returns>An <see cref="Activity"/> to send as a response.</returns>
private static Activity ProcessInput(ITurnContext turnContext)
{
var activity = turnContext.Activity;
var reply = activity.CreateReply();
if (activity.Attachments != null && activity.Attachments.Any())
{
// We know the user is sending an attachment as there is at least one item
// in the Attachments list.
HandleIncomingAttachment(activity, reply);
}
else
{
// Send at attachment to the user.
HandleOutgoingAttachment(activity, reply);
}
return reply;
}
/// <summary>
/// Adds an attachment to the 'reply' parameter that is passed in.
/// </summary>
private static void HandleOutgoingAttachment(IMessageActivity activity, IMessageActivity reply)
{
// Look at the user input, and figure out what kind of attachment to send.
if (activity.Text.StartsWith("1"))
{
reply.Text = "This is an inline attachment.";
reply.Attachments = new List<Attachment>() { GetInlineAttachment() };
}
else if (activity.Text.StartsWith("2"))
{
reply.Text = "This is an attachment from a HTTP URL.";
reply.Attachments = new List<Attachment>() { GetInternetAttachment() };
}
else if (activity.Text.StartsWith("3"))
{
reply.Text = "This is an uploaded attachment.";
// Get the uploaded attachment.
var uploadedAttachment = GetUploadedAttachmentAsync(reply.ServiceUrl, reply.Conversation.Id).Result;
reply.Attachments = new List<Attachment>() { uploadedAttachment };
}
else
{
// The user did not enter input that this bot was built to handle.
reply.Text = "Your input was not recognized please try again.";
}
}
/// <summary>
/// Handle attachments uploaded by users. The bot receives an <see cref="Attachment"/> in an <see cref="Activity"/>.
/// The activity has a <see cref="IList{T}"/> of attachments.
/// </summary>
/// <remarks>
/// Not all channels allow users to upload files. Some channels have restrictions
/// on file type, size, and other attributes. Consult the documentation for the channel for
/// more information. For example Skype's limits are here
/// <see ref="https://support.skype.com/en/faq/FA34644/skype-file-sharing-file-types-size-and-time-limits"/>.
/// </remarks>
private static void HandleIncomingAttachment(IMessageActivity activity, IMessageActivity reply)
{
foreach (var file in activity.Attachments)
{
// Determine where the file is hosted.
var remoteFileUrl = file.ContentUrl;
// Save the attachment to the system temp directory.
var localFileName = Path.Combine(Path.GetTempPath(), file.Name);
// Download the actual attachment
using (var webClient = new WebClient())
{
webClient.DownloadFile(remoteFileUrl, localFileName);
}
reply.Text = $"Attachment \"{activity.Attachments[0].Name}\"" +
$" has been received and saved to \"{localFileName}\"";
}
}
/// <summary>
/// Creates an inline attachment sent from the bot to the user using a base64 string.
/// </summary>
/// <returns>An <see cref="Attachment"/> to be displayed to the user.</returns>
/// <remarks>
/// Using a base64 string to send an attachment will not work on all channels.
/// Additionally, some channels will only allow certain file types to be sent this way.
/// For example a .png file may work but a .pdf file may not on some channels.
/// Please consult the channel documentation for specifics.
/// </remarks>
private static Attachment GetInlineAttachment()
{
var imagePath = Path.Combine(Environment.CurrentDirectory, @"Resources\architecture-resize.png");
var imageData = Convert.ToBase64String(File.ReadAllBytes(imagePath));
return new Attachment
{
Name = @"Resources\architecture-resize.png",
ContentType = "image/png",
ContentUrl = $"data:image/png;base64,{imageData}",
};
}
/// <summary>
/// Creates an <see cref="Attachment"/> to be sent from the bot to the user from an uploaded file.
/// </summary>
/// <returns>A <see cref="Task"/> representing the operation result.</returns>
private static async Task<Attachment> GetUploadedAttachmentAsync(string serviceUrl, string conversationId)
{
if (string.IsNullOrWhiteSpace(serviceUrl))
{
throw new ArgumentNullException(nameof(serviceUrl));
}
if (string.IsNullOrWhiteSpace(conversationId))
{
throw new ArgumentNullException(nameof(conversationId));
}
var imagePath = Path.Combine(Environment.CurrentDirectory, @"Resources\architecture-resize.png");
// Create a connector client to use to upload the image.
using (var connector = new ConnectorClient(new Uri(serviceUrl)))
{
var attachments = new Attachments(connector);
var response = await attachments.Client.Conversations.UploadAttachmentAsync(
conversationId,
new AttachmentData
{
Name = @"Resources\architecture-resize.png",
OriginalBase64 = File.ReadAllBytes(imagePath),
Type = "image/png",
});
var attachmentUri = attachments.GetAttachmentUri(response.Id);
return new Attachment
{
Name = @"Resources\architecture-resize.png",
ContentType = "image/png",
ContentUrl = attachmentUri,
};
}
}
/// <summary>
/// Creates an <see cref="Attachment"/> to be sent from the bot to the user from a HTTP URL.
/// </summary>
/// <returns>A <see cref="Task"/> representing the operation result.</returns>
private static Attachment GetInternetAttachment()
{
// ContentUrl must be HTTPS.
return new Attachment
{
Name = @"Resources\architecture-resize.png",
ContentType = "image/png",
ContentUrl = "https://docs.microsoft.com/en-us/bot-framework/media/how-it-works/architecture-resize.png",
};
}
}
}
希望能帮助到你。
您从turnContext对象的活动实例获取附件，您可以添加自定义代码以将其保存在特定位置，如azure存储或sharepoint库