Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Rewrite;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using VoiConShop.Data;
using VoiConShop.Models;
using VoiConShop.Services;

namespace VoiConShop
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", false, true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", true);

            if (env.IsDevelopment())
            {
                builder.AddUserSecrets<Startup>();
            }

            builder.AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.Configure<MvcOptions>(options =>
            {
                options.Filters.Add(new RequireHttpsAttribute());
            });

            // Add framework services.
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services.AddIdentity<ApplicationUser, IdentityRole>(config =>
            {
                config.SignIn.RequireConfirmedEmail = true;
            })
            .AddEntityFrameworkStores<ApplicationDbContext>().AddDefaultTokenProviders();

            // Add resource for multiple languages
            services.AddLocalization();
            services.AddMvc();

            services.Configure<RouteOptions>(options =>
            {
                options.ConstraintMap.Add("lang", typeof(LanguageRouteConstraint));
            });

            services.AddTransient<CustomLocalizer>();

            // Add application services.
            services.AddTransient<IEmailSender, AuthMessageSender>();
            services.AddTransient<ISmsSender, AuthMessageSender>();

            services.Configure<AuthMessageSenderOptions>(options =>
            {
                options.SendGridKey = Configuration["SendGridKey"];
                options.SendGridUser = Configuration["SendGridUser"];
                options.SmsAccountSid = Configuration["SmsAccountSid"];
                options.SmsAuthToken = Configuration["SmsAuthToken"];
                options.SmsPhoneNumber = Configuration["SmsPhoneNumber"];

                options.SMSAccountIdentification = Configuration["SMSAccountIdentification"];
                options.SMSAccountPassword = Configuration["SMSAccountPassword"];
                options.SMSAccountFrom = Configuration["SMSAccountFrom"];
            });

            //services.Configure<SMSoptions>(options =>
            //{
            //    options.SmsPhoneNumber = Configuration["SmsAccountSid"];
            //    options.SmsAccountSid = Configuration["SmsAuthToken"];
            //    options.SmsAuthToken = Configuration["SMSAccountPassword"];
            //});

            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            var options = new RewriteOptions().AddRedirectToHttps(301, 44339);
            app.UseRewriter(options);

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();
            var localizedOptions = app.ApplicationServices.GetService<IOptions<RequestLocalizationOptions>>();
            app.UseRequestLocalization(localizedOptions.Value);

            app.UseIdentity();

            app.UseFacebookAuthentication(new FacebookOptions
            {
                AppId = Configuration["Authentication:Facebook:AppId"],
                AppSecret = Configuration["Authentication:Facebook:AppSecret"]
            });

            app.UseGoogleAuthentication(new GoogleOptions
            {
                ClientId = Configuration["Authentication:Google:ClientId"],
                ClientSecret = Configuration["Authentication:Google:ClientSecret"]
            });

             app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "LocalizedDefault",
                    template: "{lang:lang}/{controller=Home}/{action=Index}/{id?}"
                );

                routes.MapRoute(
                    name: "default",
                    template: "{*catchall}",
                    defaults: new { controller = "Home", action = "RedirectToDefaultLanguage", lang = "en" });
            });
        }
    }
}