agologum/api/src/Services/JwtService.cs

using Microsoft.IdentityModel.Tokens;
using System.Text;
using System.Security.Claims;
using System.IdentityModel.Tokens.Jwt;

using agologumApi.Models;

public class JwtService {

    private readonly IConfiguration config_;

    public JwtService(IConfiguration config) { // why the heck does c# not have initializer lists ?
        config_ = config;
    }

    public string? GenerateJwt(User user) {

        string? jwtKey = config_["Jwt:Key"];
        if(jwtKey == null) return null;
        var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtKey));

        var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

        if(user.UserName == null) return null;

        // not too sure
        var claims = new[] {
            new Claim(ClaimTypes.Name, user.UserName),
            new Claim(ClaimTypes.NameIdentifier, user.Id.ToString())
        };

        var token = new JwtSecurityToken(
            issuer: "agologum",
            audience: "agologum",
            claims: claims,
            expires: DateTime.UtcNow.AddHours(2), // will add a refresher later
            signingCredentials: creds
        );

        return new JwtSecurityTokenHandler().WriteToken(token);

    }


}