Program.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using Stations.API.Data;
using System.Text;
using Stations.API.Repositories;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(options =>
{
    options.SwaggerDoc("v1", new OpenApiInfo { Title = "Stations 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>()
    }
    });
});

builder.Services.AddDbContext<StationsDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("StationsConnStr")));
builder.Services.AddDbContext<StationsAuthDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("StationsAuthConnStr")));
builder.Services.AddScoped<ITokenRepository, TokenRepository>();

builder.Services.AddIdentityCore<IdentityUser>()
    .AddRoles<IdentityRole>()
    .AddTokenProvider<DataProtectorTokenProvider<IdentityUser>>("Stations")
    .AddEntityFrameworkStores<StationsAuthDbContext>()
    .AddDefaultTokenProviders();

builder.Services.Configure<IdentityOptions>(options =>
{
    //Just for this project, keep simple
    options.Password.RequireDigit = false;
    options.Password.RequireLowercase = false;
    options.Password.RequireNonAlphanumeric = false;
    options.Password.RequireUppercase = false;
    options.Password.RequiredLength = 6;
    options.Password.RequiredUniqueChars = 1;
});


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(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.UseHttpsRedirection();

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

app.MapControllers();

app.Run();