Startup.cs

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

using System;
using System.Linq;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Bot.Builder;
using Microsoft.Bot.Builder.Integration.AspNet.Core;
using Microsoft.Bot.Configuration;
using Microsoft.Bot.Connector.Authentication;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Microsoft.BotBuilderSamples
{
    public class Startup
    {
        private ILoggerFactory _loggerFactory;
        private bool _isProduction = false;

        public Startup(IHostingEnvironment env)
        {
            _isProduction = env.IsProduction();

            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();

            Configuration = builder.Build();
        }

        public IConfiguration Configuration { get; }

        /// <summary>/
        /// This method gets called by the runtime. Use this method to add services to the container.
        /// </summary>
        /// <param name="services">Specifies the contract for a <see cref="IServiceCollection"/> of service descriptors.</param>
        /// <seealso cref="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-2.1"/>
        public void ConfigureServices(IServiceCollection services)
        {
            // Add botConfiguration singleton
            // See https://aka.ms/about-bot-file to learn more about .bot file its use and bot configuration.
            var secretKey = Configuration.GetSection("botFileSecret")?.Value;
            var botFilePath = Configuration.GetSection("botFilePath")?.Value;
            var botConfig = BotConfiguration.Load(botFilePath ?? @".\cafe-bot.bot", secretKey);
            services.AddSingleton(sp => botConfig ?? throw new InvalidOperationException($"The .bot configuration file could not be loaded. botFilePath: {botFilePath}"));

            // Add BotServices singleton
            services.AddSingleton(sp => new BotServices(botConfig));

            // The Memory Storage used here is for local bot debugging only.
            // When the bot is restarted, everything stored in memory will be gone.
            IStorage dataStore = new MemoryStorage();

            // For production bots use the Azure Blob or
            // Azure CosmosDB storage providers. For the Azure
            // based storage providers, add the Microsoft.Bot.Builder.Azure
            // Nuget package to your solution. That package is found at:
            // https://www.nuget.org/packages/Microsoft.Bot.Builder.Azure/
            // Un-comment the following lines to use Azure Blob Storage
            // // Storage configuration name or ID from the .bot file.
            // const string StorageConfigurationId = "<STORAGE-NAME-OR-ID-FROM-BOT-FILE>";
            // var blobConfig = botConfig.FindServiceByNameOrId(StorageConfigurationId);
            // if (!(blobConfig is BlobStorageService blobStorageConfig))
            // {
            //    throw new InvalidOperationException($"The .bot file does not contain an blob storage with name '{StorageConfigurationId}'.");
            // }
            // // Default container name.
            // const string DefaultBotContainer = "<DEFAULT-CONTAINER>";
            // var storageContainer = string.IsNullOrWhiteSpace(blobStorageConfig.Container) ? DefaultBotContainer : blobStorageConfig.Container;
            // IStorage dataStore = new Microsoft.Bot.Builder.Azure.AzureBlobStorage(blobStorageConfig.ConnectionString, storageContainer);
            services.AddSingleton(dataStore);
            var userState = new UserState(dataStore);
            var conversationState = new ConversationState(dataStore);

            services.AddSingleton(userState);
            services.AddSingleton(conversationState);

            // The BotStateSet enables read() and write() in parallel on multiple BotState instances.
            services.AddSingleton(new BotStateSet(userState, conversationState));

            // Add the bot with options
            services.AddBot<CafeBot>(options =>
            {
                // Load the connected services from .bot file.
                var environment = _isProduction ? "production" : "development";
                var service = botConfig.Services.FirstOrDefault(s => s.Type == "endpoint" && s.Name == environment);
                if (!(service is EndpointService endpointService))
                {
                    throw new InvalidOperationException($"The .bot file does not contain an endpoint with name '{environment}'.");
                }

                options.CredentialProvider = new SimpleCredentialProvider(endpointService.AppId, endpointService.AppPassword);

                // Catches any errors that occur during a conversation turn and logs them to currently
                // configured ILogger.
                ILogger logger = _loggerFactory.CreateLogger<CafeBot>();
                options.OnTurnError = async (context, exception) =>
                {
                    logger.LogError($"Exception caught : {exception}");
                    await context.SendActivityAsync("Sorry, it looks like something went wrong.");
                };

                // Automatically save state at the end of a turn.
                options.Middleware
                    .Add(new AutoSaveStateMiddleware(userState, conversationState));
            });
        }

        /// <summary>
        /// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        /// </summary>
        /// <param name="app">The application builder. This provides the mechanisms to configure the application request pipeline.</param>
        /// <param name="env">Provides information about the web hosting environment.</param>
        /// <param name="loggerFactory">The <see cref="ILoggerFactory"/> to create logger object for tracing.</param>
        /// <remarks>See <see cref="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-2.1"/> for
        /// more information how environments are detected.</remarks>
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            _loggerFactory = loggerFactory;
            app.UseDefaultFiles()
                .UseStaticFiles()
                .UseBotFramework();
        }
    }
}