Add project files

T120B165-ImgBoard/Services/TokenService.cs

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+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.IdentityModel.Tokens;
+using T120B165_ImgBoard.Data;
+using T120B165_ImgBoard.Models;
+
+namespace T120B165_ImgBoard.Services;
+
+public interface ITokenService
+{
+    Task<string> GenerateJwtToken(User user);
+    Task<string> GenerateRefreshToken(User user);
+
+    Task<RefreshToken?> GetRefreshTokenByValue(string refreshToken);
+    Task<bool> InvalidateRefreshToken(RefreshToken refreshToken);
+}
+
+public class TokenService(ImgBoardContext context, IConfiguration config, UserManager<User> userManager): ITokenService
+{
+
+    public async Task<RefreshToken?> GetRefreshTokenByValue(string refreshToken)
+    {
+        return await context.RefreshTokens.Where(t => t.Token == refreshToken && t.Expires > DateTime.Now)
+            .Include(t => t.User)
+            .FirstOrDefaultAsync();
+    }
+
+    public async Task<bool> InvalidateRefreshToken(RefreshToken refreshToken)
+    {
+        context.RefreshTokens.Remove(refreshToken);
+        await context.SaveChangesAsync();
+        return true;
+    }
+    
+    public async Task<string> GenerateJwtToken(User user)
+    {
+        var roles = await userManager.GetRolesAsync(user);
+        var claims = new List<Claim>
+        {
+            new(JwtRegisteredClaimNames.Sub, user.Id),
+            new(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
+            new(JwtRegisteredClaimNames.Email, user.Email)
+        };
+        claims.AddRange(roles.Select(role => new Claim(ClaimTypes.Role, role)));
+
+        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(config["Jwt:Key"]));
+        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+
+        var token = new JwtSecurityToken(
+            issuer: config["Jwt:Issuer"],
+            audience: config["Jwt:Audience"],
+            claims: claims,
+            expires: DateTime.Now.AddMinutes(Convert.ToDouble(config["Jwt:DurationInMinutes"])),
+            signingCredentials: creds);
+
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+
+    public async Task<string> GenerateRefreshToken(User user)
+    {
+        var token = new RefreshToken
+        {
+            Expires = DateTime.Now.AddDays(30),
+            Token = Guid.NewGuid().ToString(),
+            User = user
+        };
+        await context.RefreshTokens.AddAsync(token);
+        await context.SaveChangesAsync();
+        return token.Token;
+    }
+}