@Default
@Dependent
@Stateless
public class AuthenticationService implements IAuthenticater
{
    private Map<String,String> db;

    @Inject KeyGenerator keygen;

    public AuthenticationService()
    {
        db = new HashMap<>();
        addToDb("aardbei", "framboos");
        addToDb("Stroezzuz", "ufo");
        addToDb("Kruet'okx","ofu");
    }

    @Override
    public boolean isAuthenticated(String name, String password)
    {
        name = name.toUpperCase();
        password = password.toUpperCase();
        return (db.get(name)!=null && db.get(name).equals(password));
    }

    private void addToDb(String user, String pass)
    {
        user = user.toUpperCase();
        pass = pass.toUpperCase();
        db.put(user,pass);
    }

    @Override
    public String issueToken(String login, UriInfo uriInfo)
    {
        Key key = keygen.generateKey();
        String jwtToken = Jwts.builder()
                .setSubject(login)
                .setIssuer(uriInfo.getAbsolutePath().toString())
                .setIssuedAt(new Date())
                .setExpiration(toDate(LocalDateTime.now().plusMinutes(15L)))
                .signWith(SignatureAlgorithm.HS512, key)
                .compact();
        return jwtToken;
    }

    @Override
    public Key generateKey()
    {
        return keygen.generateKey();
    }

    private Date toDate(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }
}