hn-dotnet/Apps/Website/Startup.cs

using HN.Application;
using HN.Domain;
using HN.Infrastructure;
using MediatR;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc.Authorization;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace Website
{
  public class Startup
  {
    public Startup(IConfiguration configuration)
    {
      Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
      services.AddDbContext<HNDbContext>(options => options.UseSqlite(Configuration.GetConnectionString("Default")));
      services.AddScoped<IHNContext, HNDbContext>();
      services.AddScoped<ILinkRepository, LinkRepository>();
      services.AddScoped<ICommentRepository, CommentRepository>();
      services.AddScoped<IExecutingUserProvider, HttpExecutingUserProvider>();
      services.AddMediatR(typeof(HN.Application.IHNContext));

      // Permet d'avoir des routes en lowercase
      services.Configure<RouteOptions>(options =>
      {
        options.LowercaseUrls = true;
        options.LowercaseQueryStrings = true;
      });

      // Pour permettre l'authentification
      services.AddIdentity<User, Role>(o =>
      {
        o.Password.RequiredLength = o.Password.RequiredUniqueChars = 0;
        o.Password.RequireDigit = o.Password.RequireLowercase = o.Password.RequireNonAlphanumeric = o.Password.RequireUppercase = false;
      })
        .AddEntityFrameworkStores<HNDbContext>();

      // Permet de reconfigurer certaines parties préconfigurées par Identity https://github.com/dotnet/aspnetcore/blob/3ea1fc7aac9d43152908d5d45ae811f3df7ca399/src/Identity/Core/src/IdentityServiceCollectionExtensions.cs#L51
      services.PostConfigure<CookieAuthenticationOptions>(IdentityConstants.ApplicationScheme, o =>
      {
        o.LoginPath = "/accounts/login";
        o.LogoutPath = "/accounts/logout";
      });

      services.AddControllersWithViews(o =>
      {
        o.Filters.Add<CustomExceptionFilter>();
        o.Filters.Add(new AuthorizeFilter()); // Nécessite l'authentification par défaut
      });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
      MigrateDatabase(app);

      if (env.IsDevelopment())
      {
        app.UseDeveloperExceptionPage();
      }
      else
      {
        app.UseExceptionHandler("/Home/Error");
        // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
      }
      app.UseHttpsRedirection();
      app.UseStaticFiles();

      app.UseRouting();

      // Permet de rediriger selon les codes d'erreurs retournés, notamment par notre CustomExceptionFilter
      app.UseStatusCodePages(context =>
      {
        var request = context.HttpContext.Request;
        var response = context.HttpContext.Response;
        if (response.StatusCode == (int)System.Net.HttpStatusCode.Unauthorized)
        {
          response.Redirect("/accounts/login");
        }

        return System.Threading.Tasks.Task.CompletedTask;
      });

      app.UseAuthentication();
      app.UseAuthorization();

      app.UseEndpoints(endpoints =>
      {
        endpoints.MapControllerRoute(
                  name: "default",
                  pattern: "{controller=Home}/{action=Index}/{id?}");
      });
    }

    /// <summary>
    /// Lance les migrations. En production, il est plutôt conseillé de générer
    /// les scripts avec `dotnet ef migrations script` et de les passer à la main. 
    /// </summary>
    /// <param name="app"></param>
    private void MigrateDatabase(IApplicationBuilder app)
    {
      using var scope = app.ApplicationServices.CreateScope();
      using var ctx = scope.ServiceProvider.GetRequiredService<HNDbContext>();
      ctx.Database.Migrate();
    }
  }
}