Program.cs

using System.Security.Claims;
using System.Text;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;
using TalkStream_API.Database;
using TalkStream_API.Hub;
using TalkStream_API.Middleware;
using TalkStream_API.Repositories.FriendRequestRepository;
using TalkStream_API.Repositories.GroupRepository;
using TalkStream_API.Repositories.MessageRepository;
using TalkStream_API.Repositories.PublicationRepository;
using TalkStream_API.Repositories.UserRepository;
using TalkStream_API.Service;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddScoped<JwtService>();
builder.Services.AddScoped<IUserRepository, UserRepository>();
builder.Services.AddScoped<IFriendshipRepository, FriendshipRepository>();
builder.Services.AddScoped<IMessageRepository, MessageRepository>();
builder.Services.AddScoped<IGroupRepository, GroupRepository>();
builder.Services.AddScoped<IPublicationRepository, PublicationRepository>();

//Exception Handler
// builder.Services.AddExceptionHandler<GlobalExceptionHandler>();
// builder.Services.AddProblemDetails();

//Global Configuration
builder.Services.AddCors(opt =>
{
    opt.AddPolicy("RNapp", builder =>
    {
        builder
            .AllowAnyHeader()
            .AllowAnyMethod()
            .SetIsOriginAllowed(origin => true)
            .AllowCredentials();
    });
});
builder.Services.AddSignalR();
builder.Services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.IgnoreCycles;
});;
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen( c=>
    {
        c.SwaggerDoc("v1", new() { Title = "Authentication_api", Version = "v1" });
        // Add security definition
        c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
        {
            Description = "JWT Authorization header using the Bearer scheme. Enter 'Bearer' [space] and then your token in the text input below.",
            Name = "Authorization",
            In = ParameterLocation.Header,
            Type = SecuritySchemeType.ApiKey,
            Scheme = "Bearer"
        });
        c.AddSecurityRequirement(new OpenApiSecurityRequirement
        {
            {
                new OpenApiSecurityScheme
                {
                    Reference = new OpenApiReference
                    {
                        Type = ReferenceType.SecurityScheme,
                        Id = "Bearer"
                    }
                },
                Array.Empty<string>()
            }
        });
    }
);

//Authentication & Authorization
//Add Authentication scheme
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(builder.Configuration["Jwt:SecureKey"] ?? string.Empty)),
        ValidateIssuer = false,
        ValidateAudience = false,
    };
});

//Authorization policy and role claim
builder.Services.AddAuthorization(options =>
{
    options.AddPolicy("Admin", policy => policy.RequireClaim(ClaimTypes.Role, "Admin"));
    options.AddPolicy("User", policy => policy.RequireClaim(ClaimTypes.Role, "User"));
});

//Database connection
builder.Services.AddDbContext<AppDbContext>(options =>
{
    var connectionString = builder.Configuration.GetConnectionString("Database");
    options.UseMySql(connectionString, ServerVersion.AutoDetect(connectionString));
});

var app = builder.Build();

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

// app.UseExceptionHandler();
app.UseHttpsRedirection();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
app.MapHub<PrivateChatHub>("/messagingHub");
app.MapHub<GroupHub>("/groupHub");
app.MapHub<NotificationHub>("/notificationHub");
app.UseCors("RNapp");
app.Run();