TeamsBot.cs

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Bot.Builder;
using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Schema;
using Microsoft.Extensions.Logging;

namespace Microsoft.BotBuilderSamples
{
    /// <summary>
    /// This bot is derived from the <see cref="DialogBot{T}"/> class and handles Teams-specific activities.
    /// </summary>
    /// <typeparam name="T">The type of Dialog to be run.</typeparam>
    public class TeamsBot<T> : DialogBot<T> where T : Dialog
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="TeamsBot{T}"/> class.
        /// </summary>
        /// <param name="conversationState">The conversation state.</param>
        /// <param name="userState">The user state.</param>
        /// <param name="dialog">The dialog to be run.</param>
        /// <param name="logger">The logger.</param>
        public TeamsBot(ConversationState conversationState, UserState userState, T dialog, ILogger<DialogBot<T>> logger)
            : base(conversationState, userState, dialog, logger)
        {
        }

        /// <summary>
        /// Handles the event when members are added to the conversation.
        /// </summary>
        /// <param name="membersAdded">The list of members added to the conversation.</param>
        /// <param name="turnContext">The context object for this turn.</param>
        /// <param name="cancellationToken">A cancellation token.</param>
        /// <returns>A task that represents the work queued to execute.</returns>
        protected override async Task OnMembersAddedAsync(IList<ChannelAccount> membersAdded, ITurnContext<IConversationUpdateActivity> turnContext, CancellationToken cancellationToken)
        {
            foreach (var member in turnContext.Activity.MembersAdded)
            {
                if (member.Id != turnContext.Activity.Recipient.Id)
                {
                    await turnContext.SendActivityAsync(MessageFactory.Text("Welcome to AuthenticationBot. Type anything to get logged in. Type 'logout' to sign-out."), cancellationToken);
                }
            }
        }

        /// <summary>
        /// Handles the Teams Sign-in verification state.
        /// </summary>
        /// <param name="turnContext">The context object for this turn.</param>
        /// <param name="cancellationToken">A cancellation token.</param>
        /// <returns>A task that represents the work queued to execute.</returns>
        protected override async Task OnTeamsSigninVerifyStateAsync(ITurnContext<IInvokeActivity> turnContext, CancellationToken cancellationToken)
        {
            _logger.LogInformation("Running dialog with signin/verifystate from an Invoke Activity.");

            // The OAuth Prompt needs to see the Invoke Activity in order to complete the login process.

            // Run the Dialog with the new Invoke Activity.
            await _dialog.RunAsync(turnContext, _conversationState.CreateProperty<DialogState>(nameof(DialogState)), cancellationToken);
        }
    }
}