First commit

Homework/JwtService.cs

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+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+
+public class JwtService
+{
+    private readonly JwtSettings _jwtSettings;
+
+    public JwtService(IOptions<JwtSettings> jwtSettings)
+    {
+        _jwtSettings = jwtSettings.Value;
+    }
+
+    public string GenerateToken(string userId, string email, string role)
+    {
+        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwtSettings.Key));
+        var credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+
+        var claims = new[]
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId),
+            new Claim(ClaimTypes.Email, email),
+            new Claim(ClaimTypes.Role, role)
+        };
+
+        var token = new JwtSecurityToken(
+            issuer: _jwtSettings.Issuer,
+            audience: _jwtSettings.Audience,
+            claims: claims,
+            expires: DateTime.UtcNow.AddMinutes(_jwtSettings.ExpireMinutes),
+            signingCredentials: credentials
+        );
+
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+}