ANTOOZA-BACKEND/Infrastructure/Authentication/JwtTokenProvider.cs

using SharedKernel;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text;
using Application.Abstractions.Authentication;
using Microsoft.Extensions.Options;
using Microsoft.IdentityModel.JsonWebTokens;
using Microsoft.IdentityModel.Tokens;

namespace Infrastructure.Authentication;

internal sealed class JwtTokenProvider(IOptions<AppSettings> options) : IJwtTokenProvider
{
    private readonly AppSettings.JwtSection _jwt = options.Value.JWT;

    public string CreateAccessToken(int memberID, string email, string? name)
    {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwt.SecretKey));
        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        var claims = new List<Claim>
        {
            new(JwtRegisteredClaimNames.Sub, memberID.ToString()),
            new(JwtRegisteredClaimNames.Email, email),
            new(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
        };

        if (!string.IsNullOrEmpty(name))
        {
            claims.Add(new Claim(JwtRegisteredClaimNames.Name, name));
        }

        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(claims),
            Expires = DateTime.UtcNow.AddMinutes(_jwt.AccessTokenExpiration),
            SigningCredentials = credentials,
            Issuer = _jwt.Issuer,
            Audience = _jwt.Audience
        };

        var handler = new JsonWebTokenHandler();
        return handler.CreateToken(tokenDescriptor);
    }

    public string CreateRefreshToken()
    {
        var randomBytes = RandomNumberGenerator.GetBytes(64);
        return Convert.ToBase64String(randomBytes);
    }

    public string CreateOAuth2AccessToken(int applicationID, string clientID, int ownerMemberID, IEnumerable<string> scopes, TimeSpan ttl)
    {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwt.SecretKey));
        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
        var scopeList = scopes as IList<string> ?? scopes.ToList();

        var claims = new List<Claim>
        {
            new(JwtRegisteredClaimNames.Sub, ownerMemberID.ToString()),
            new(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
            new("app_id", applicationID.ToString()),
            new("client_id", clientID),
            new("token_id", applicationID.ToString()),
            new("token_type", "oauth2"),
            new("scope", string.Join(' ', scopeList))
        };

        foreach (var s in scopeList)
        {
            claims.Add(new Claim("scp", s));
        }

        var tokenDescriptor = new SecurityTokenDescriptor
        {
            Subject = new ClaimsIdentity(claims),
            Expires = DateTime.UtcNow.Add(ttl),
            SigningCredentials = credentials,
            Issuer = _jwt.Issuer,
            Audience = "antooza-public-api"
        };

        var handler = new JsonWebTokenHandler();
        return handler.CreateToken(tokenDescriptor);
    }
}