Program.cs

using Microsoft.EntityFrameworkCore;
using CarMaintenance.Data;
using CarMaintenance.Repositories;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Identity;
using Microsoft.OpenApi.Models;
using Serilog;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

var logger = new LoggerConfiguration()
    .WriteTo.Console()
    .WriteTo.File("Logs/CarMaintenance_Log.txt", rollingInterval: RollingInterval.Day)
    .MinimumLevel.Information()
    .CreateLogger();

builder.Logging.ClearProviders();
builder.Logging.AddSerilog(logger);

builder.Services.AddControllers();

builder.Services.AddDbContext<CarsDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("CarMaintenanceContext")));
builder.Services.AddDbContext<CarsAuthDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("CarMaintenanceAuth")));

// Register repositories
builder.Services.AddScoped<IMaintenanceRecordRepository, SQLServerMaintenanceRecord>();
builder.Services.AddScoped<ICarRepository, SQLServerCarRepository>();
builder.Services.AddScoped<IUserRepository, SQLServerUserRepository>();
builder.Services.AddScoped<ITokenRepository, TokenRepository>();

builder.Services.AddAutoMapper(typeof(AutoMapperProfiles));

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(options =>
{
    options.SwaggerDoc("v1", new OpenApiInfo
    {
        Title = "Car Maintenance API",
        Version = "v1"
    });

    options.AddSecurityDefinition(JwtBearerDefaults.AuthenticationScheme, new OpenApiSecurityScheme
    {
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.ApiKey,
        Scheme = JwtBearerDefaults.AuthenticationScheme
    });

    options.AddSecurityRequirement(new OpenApiSecurityRequirement {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = JwtBearerDefaults.AuthenticationScheme
                },
                Scheme = "Oauth2",
                Name = JwtBearerDefaults.AuthenticationScheme,
                In = ParameterLocation.Header
            },
            new List<string>()
        }
    });
});

// Identity
builder.Services.AddIdentityCore<IdentityUser>()
    .AddTokenProvider<DataProtectorTokenProvider<IdentityUser>>("CarMaintenance")
    .AddEntityFrameworkStores<CarsAuthDbContext>()
    .AddDefaultTokenProviders();

builder.Services.Configure<IdentityOptions>(options =>
{
    options.Password.RequireDigit = false;
    options.Password.RequireLowercase = false;
    options.Password.RequireNonAlphanumeric = false;
    options.Password.RequireUppercase = false;
    options.Password.RequiredLength = 6;
    options.Password.RequiredUniqueChars = 1;
});

// Authentication
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options => options.TokenValidationParameters = new TokenValidationParameters
{
    ValidateIssuer = true,
    ValidateAudience = true,
    ValidateLifetime = true,
    ValidateIssuerSigningKey = true,
    ValidIssuer = builder.Configuration["Jwt:Issuer"],
    ValidAudience = builder.Configuration["Jwt:Audience"],
    IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"]))
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseMiddleware<ExceptionHandlerMiddleware>();
app.UseHttpsRedirection();

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

app.MapControllers();

app.Run();