/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.epam.dlab.backendapi.auth;

import com.epam.dlab.auth.UserInfo;
import de.ahus1.keycloak.dropwizard.AbstractKeycloakAuthenticator;
import de.ahus1.keycloak.dropwizard.KeycloakConfiguration;
import io.dropwizard.auth.AuthenticationException;
import org.keycloak.KeycloakSecurityContext;
import org.keycloak.representations.AccessToken;

import javax.servlet.http.HttpServletRequest;
import java.util.List;
import java.util.Optional;

import static java.util.Collections.emptyList;

public class KeycloakAuthenticator extends AbstractKeycloakAuthenticator<UserInfo> {

	private static final String GROUPS_CLAIM = "groups";

	public KeycloakAuthenticator(KeycloakConfiguration keycloakConfiguration) {
		super(keycloakConfiguration);
	}

	@Override
	public Optional<UserInfo> authenticate(HttpServletRequest request) throws AuthenticationException {
		return super.authenticate(request);

	}

	@Override
	@SuppressWarnings("unchecked")
	protected UserInfo prepareAuthentication(KeycloakSecurityContext keycloakSecurityContext,
											 HttpServletRequest httpServletRequest,
											 KeycloakConfiguration keycloakConfiguration) {
		final AccessToken token = keycloakSecurityContext.getToken();
		final UserInfo userInfo = new UserInfo(token.getPreferredUsername(),
				keycloakSecurityContext.getTokenString());
		userInfo.addRoles((List<String>) token.getOtherClaims().getOrDefault(GROUPS_CLAIM, emptyList()));
		return userInfo;
	}
}