Refactor to introduce Govor.Application and Govor.Contracts layers

Moved service implementations and interfaces from Govor.API and Govor.Core to new Govor.Application and Govor.Contracts projects. Updated namespaces and references throughout the solution. Added custom exception classes for authentication and invite services. Adjusted dependency injection and project references to use the new structure. This refactor improves separation of concerns and prepares the codebase for better maintainability and scalability.

Govor.Application/Services/AuthService.cs

@@ -0,0 +1,75 @@
+using Govor.API.Services.Authentication.Interfaces;
+using Govor.Application.Exceptions.AuthService;
+using Govor.Core.Infrastructure.Extensions;
+using Govor.Core.Models;
+using Govor.Core.Repositories.Users;
+using Govor.Application.Interfaces.Authentication;
+using Govor.Core.Repositories.Admins;
+
+namespace Govor.Application.Services;
+
+public class AuthService : IAccountService
+{
+    private readonly IPasswordHasher _passwordHasher;
+    private readonly IJwtService _jwtService;
+    private readonly IUsersRepository _usersRepository;
+    private readonly IAdminsRepository _adminsRepository;
+    
+    public AuthService(IUsersRepository usersRepository, 
+        IJwtService jwtService,
+        IPasswordHasher passwordHasher,
+        IAdminsRepository adminsRepository
+       )
+    {
+        _usersRepository = usersRepository;
+        _jwtService = jwtService;
+        _passwordHasher = passwordHasher;
+        _adminsRepository = adminsRepository;
+    }
+    
+    public async Task<string> RegistrationAsync(string name, string password, Invitation invitation)
+    {
+        if (await _usersRepository.ExistsUsernameAsync(name))
+            throw new UserAlreadyExistException(name);
+        
+        var passwordHash = _passwordHasher.Hash(password);
+        
+        var user = new User
+        {
+            Id = Guid.NewGuid(),
+            Username = name,
+            PasswordHash = passwordHash,
+            Description = string.Empty,
+            CreatedOn = DateOnly.FromDateTime(DateTime.UtcNow),
+            IconId = Guid.NewGuid(),
+            WasOnline = DateTime.UtcNow,
+            InviteId = invitation.Id
+        };
+        
+        await _usersRepository.AddAsync(user);
+        
+        SetRole(user, invitation);
+        
+        return _jwtService.GenerateJwtToken(user);
+    }
+
+
+    public async Task<string> LoginAsync(string name, string password)
+    {
+        if (await _usersRepository.ExistsUsernameAsync(name) == false)
+            throw new UserNotRegisteredException(name);
+        
+        var user = await _usersRepository.FindByUsernameAsync(name);
+        
+        if (_passwordHasher.Verify(password, user.PasswordHash) == false)
+            throw new LoginUserException();
+        
+        return _jwtService.GenerateJwtToken(user);
+    }
+
+    private async void SetRole(User user, Invitation invitation)
+    {
+        if(invitation.IsAdmin)
+            await _adminsRepository.AddAsync(new Admin() { UserId = user.Id });
+    }
+}