ExampleAuthenticator.java

package com.example.helloworld.auth;

import com.example.helloworld.core.User;
import io.dropwizard.auth.AuthenticationException;
import io.dropwizard.auth.basic.BasicCredentials;
import io.dropwizard.java8.auth.Authenticator;

import java.util.Optional;

public class ExampleAuthenticator implements Authenticator<BasicCredentials, User> {
    @Override
    public Optional<User> authenticate(BasicCredentials credentials) throws AuthenticationException {
        if ("secret".equals(credentials.getPassword())) {
            return Optional.of(new User(credentials.getUsername()));
        }
        return Optional.empty();
    }
}