Program.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using System.Security.Cryptography;
using System.Text;
using WGO_API.Models.CommentModel;
using WGO_API.Models.MarkerModel;
using WGO_API.Models.ReportModel;
using WGO_API.Models.UserModel;
using Newtonsoft.Json;
using Microsoft.OpenApi.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
builder.Services.AddDbContext<MarkerContext>(opt =>
    opt.UseSqlite("Data Source=Databases/Markers.db"));
builder.Services.AddDbContext<UserContext>(opt =>
    opt.UseSqlite("Data Source=Databases/Users.db"));
builder.Services.AddDbContext<CommentContext>(opt =>
    opt.UseSqlite("Data Source=Databases/Comments.db"));
builder.Services.AddDbContext<ReportContext>(opt =>
    opt.UseSqlite("Data Source=Databases/Reports.db"));

builder.Services.AddIdentity<User, IdentityRole>()
    .AddEntityFrameworkStores<UserContext>()
    .AddDefaultTokenProviders();

string? jwtKey = builder.Configuration["Jwt:Key"];
if (string.IsNullOrEmpty(jwtKey))
{
    jwtKey = Convert.ToBase64String(RandomNumberGenerator.GetBytes(32));
    string filePath = Path.Combine(Directory.GetCurrentDirectory(), "appsettings.json");
    string json = File.ReadAllText(filePath);
    dynamic jsonObj = JsonConvert.DeserializeObject(json) ?? 
        throw new Exception("Empty jwtKey not filled properly");

    jsonObj["Jwt"]["Key"] = jwtKey;
    string output = JsonConvert.SerializeObject(jsonObj, Formatting.Indented);
    File.WriteAllText(filePath, output);
}

var key = Encoding.ASCII.GetBytes(jwtKey);

builder.Services.AddAuthentication(opt =>
{
    opt.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    opt.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options => {
        options.RequireHttpsMetadata = false;
        options.SaveToken = true;
        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(key)
        };
    });

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(option =>
{
    option.SwaggerDoc("v1", new OpenApiInfo { Title = "WGO API Test", Version = "v1.0" });
    option.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        In = ParameterLocation.Header,
        Description = "Please enter a valid token",
        Name = "Authorization",
        Type = SecuritySchemeType.Http,
        BearerFormat = "JWT",
        Scheme = "Bearer"
    });
    option.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type=ReferenceType.SecurityScheme,
                    Id="Bearer"
                }
            },
            new string[]{}
        }
    });
});

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();