Feature(Auth): Add Login and Refresh Token

RT.Application/Services/Implementation/TokenService.cs

@@ -0,0 +1,43 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Security.Cryptography;
+using System.Text;
+using Microsoft.Extensions.Configuration;
+using Microsoft.IdentityModel.Tokens;
+using RT.Application.Services.Contract;
+
+namespace RT.Application.Services.Implementation;
+
+public class TokenService(IConfiguration configuration) : ITokenService
+{
+    public (string token, DateTime expiresAt) GenerateToken(string userId, string email, string userName)
+    {
+        var key     = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["Jwt:Key"]!));
+        var creds   = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+        var expires = DateTime.UtcNow.AddMinutes(double.Parse(configuration["Jwt:ExpiresMinutes"] ?? "60"));
+
+        var claims = new[]
+        {
+            new Claim(JwtRegisteredClaimNames.Sub,   userId),
+            new Claim(JwtRegisteredClaimNames.Email, email),
+            new Claim(JwtRegisteredClaimNames.Name,  userName),
+            new Claim(JwtRegisteredClaimNames.Jti,   Guid.NewGuid().ToString()),
+        };
+
+        var token = new JwtSecurityToken(
+            issuer:   configuration["Jwt:Issuer"],
+            audience: configuration["Jwt:Audience"],
+            claims:   claims,
+            expires:  expires,
+            signingCredentials: creds);
+
+        return (new JwtSecurityTokenHandler().WriteToken(token), expires);
+    }
+
+    public (string token, DateTime expiresAt) GenerateRefreshToken()
+    {
+        var token   = Convert.ToBase64String(RandomNumberGenerator.GetBytes(64));
+        var expires = DateTime.UtcNow.AddDays(double.Parse(configuration["Jwt:RefreshExpiresDays"] ?? "7"));
+        return (token, expires);
+    }
+}