Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HackNU.Data;
using HackNU.Models;
using HackNU.Options;
using HackNU.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;

namespace HackNU
{
    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)
        {
            var jwtOptions = new JwtOptions();
            Configuration.Bind(nameof(JwtOptions), jwtOptions);
            
            services.AddSingleton(jwtOptions);

            services.AddScoped<IUserService, UserService>();
            services.AddScoped<IEventService, EventService>();
            services.AddScoped<ITagsService, TagsService>();
            services.AddScoped<IIdentityService, IdentityService>();
            

            services.AddAuthentication(x =>
            {
                x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                x.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
                x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            })
                .AddJwtBearer(x =>
                {
                    x.SaveToken = true;
                    x.TokenValidationParameters = new TokenValidationParameters
                    {
                        ValidateIssuerSigningKey = true,
                        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(jwtOptions.Secret)),
                        ValidateIssuer = false,
                        ValidateAudience = false,
                        RequireExpirationTime = false,
                        ValidateLifetime = true
                    };
                });

            services.AddDbContext<DataContext>(x =>
            {
                x
                    .UseLazyLoadingProxies()
                    .UseNpgsql(Configuration.GetConnectionString("Default"));
            });

            services.AddIdentity<UserModel, IdentityRole>()
                .AddEntityFrameworkStores<DataContext>();
            
            services.AddControllers();
            services.AddSwaggerGen(c =>
            {
                c.EnableAnnotations();
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "HackNU", Version = "v1" });

                var security = new Dictionary<string, IEnumerable<string>>
                {
                    {"Bearer", new string[0]}
                };
                
                c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
                {
                    Description = "JWT Authorization header using the bearer scheme",
                    Name = "Authorization",
                    In = ParameterLocation.Header,
                    Type = SecuritySchemeType.ApiKey,
                    Scheme = "Bearer"
                });
                
                // Dictionary
                c.AddSecurityRequirement(new OpenApiSecurityRequirement
                {
                    {
                        new OpenApiSecurityScheme
                        {
                            Reference = new OpenApiReference
                            {
                                Type = ReferenceType.SecurityScheme,
                                Id = "Bearer"
                            },
                            Scheme = "oauth2",
                            Name = "Bearer",
                            In = ParameterLocation.Header,
                        },
                        new List<string>()
                    }
                });
                
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "HackNU v1"));
            }

            app.UseHttpsRedirection();

            app.UseRouting();
            
            app.UseForwardedHeaders(new ForwardedHeadersOptions
            {
                ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
            });

            app.UseAuthentication();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}