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/JwtService.cs

@@ -0,0 +1,40 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Govor.API.Services.Authentication.Interfaces;
+using Govor.Core.Models;
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+
+namespace Govor.Application.Services;
+
+public class JwtService : IJwtService
+{
+    private JwtOption _jwtOption;
+    private IInvitesService _invitesService;
+    
+    public JwtService(IOptions<JwtOption> options, IInvitesService invitesService)
+    {
+        _jwtOption = options.Value;
+        _invitesService = invitesService;
+    }
+    
+    public string GenerateJwtToken(User user)
+    {
+        var claims = new[]
+        {
+            new Claim("userID", user.Id.ToString()),
+            new Claim(ClaimTypes.Role, _invitesService.GetRole(user).Result, ClaimValueTypes.String)
+        };
+        
+        var singing = new SigningCredentials(
+            new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwtOption.SecretKeу)),
+            SecurityAlgorithms.HmacSha256Signature);
+
+        var token = new JwtSecurityToken(signingCredentials: singing,
+            expires: DateTime.UtcNow.AddHours(_jwtOption.Hours),
+            claims: claims);
+        
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+}