LibraryManagement.Backend/Program.cs

using System.Text;
using Database.Models;
using LibraryManagement.Backend.Features.Auth;
using LibraryManagement.Backend.Features.Users;
using LibraryManagement.Backend.Features.Books;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using LibraryManagement.Backend.Features.Subscriptions;
using LibraryManagement.Backend.Features.Categories;
using LibraryManagement.Backend.Features.Borrowings;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();
builder.Services.AddAuthorization();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "Library Management API", Version = "v1" });
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
    {
        Description = "JWT Authorization header using the Bearer scheme.",
        Name = "Authorization",
        In = ParameterLocation.Header,
        Type = SecuritySchemeType.Http,
        Scheme = "bearer",
        BearerFormat = "JWT"
    });
    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer"
                }
            },
            new string[] {}
        }
    });
});

builder.Services.AddDbContext<LibraryManagementContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("MssqlConnection")));

// Register Services
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddScoped<IUserService, UserService>();
builder.Services.AddScoped<IBookService, BookService>();
builder.Services.AddScoped<ISubscriptionService, SubscriptionService>();
builder.Services.AddScoped<ICategoryService, CategoryService>();
builder.Services.AddScoped<IBorrowingService, BorrowingService>();

// Configure JWT Authentication
var key = Encoding.ASCII.GetBytes(builder.Configuration["Jwt:Secret"] ?? "YourSuperSecretKeyForLibraryManagementSystem_AtLeast32CharsLong");
builder.Services.AddAuthentication(x =>
{
    x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(x =>
{
    x.RequireHttpsMetadata = false;
    x.SaveToken = true;
    x.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(key),
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidIssuer = builder.Configuration["Jwt:Issuer"],
        ValidAudience = builder.Configuration["Jwt:Audience"],
        ClockSkew = TimeSpan.Zero
    };
});

var app = builder.Build();

app.UseSwagger();
app.UseSwaggerUI();
app.UseAuthentication();
app.UseAuthorization();

app.MapControllers();

app.Run();