/*
 * Copyright 2004-present the original author or authors.
 *
 * Licensed 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
 *
 *      https://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 org.springframework.security.authorization;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.springframework.util.Assert;

/**
 * A {@link Map} based implementation of {@link RequiredAuthoritiesRepository}.
 *
 * @author Rob Winch
 * @since 7.0
 */
public final class MapRequiredAuthoritiesRepository implements RequiredAuthoritiesRepository {

	private final Map<String, List<String>> usernameToAuthorities = new ConcurrentHashMap<>();

	@Override
	public List<String> findRequiredAuthorities(String username) {
		Assert.hasText(username, "username cannot be empty");
		return this.usernameToAuthorities.getOrDefault(username, Collections.emptyList());
	}

	public void saveRequiredAuthorities(String username, List<String> authorities) {
		Assert.hasText(username, "username cannot be empty");
		Assert.notNull(authorities, "authorities cannot be null");
		List<String> userAuthorities = new ArrayList<>(authorities);
		this.usernameToAuthorities.put(username, userAuthorities);
	}

	public void deleteRequiredAuthorities(String username) {
		Assert.hasText(username, "username cannot be empty");
		this.usernameToAuthorities.remove(username);
	}

}
