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/*
 * Copyright (c) 2018-2019.‭‭‭‭‭‭‭‭‭‭‭‭[zuoqinggang] www.pingfangushi.com
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package cn.smallbun.scaffold.framework.security.utils;

import cn.smallbun.scaffold.framework.security.domain.User;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Optional;

/**
 * Spring Security的实用程序类。
 * @author SanLi
 * Created by [email protected] / [email protected] on  2019/5/7
 */
public final class SecurityUtils {

	private SecurityUtils() {
	}

	/**
	 * Get the login of the current user.
	 *
	 * @return the login of the current user.
	 */
	public static Optional getCurrentUserLogin() {
		SecurityContext securityContext = SecurityContextHolder.getContext();
		return Optional.ofNullable(securityContext.getAuthentication()).map(authentication -> {
			if (authentication.getPrincipal() instanceof UserDetails) {
				UserDetails springSecurityUser = (UserDetails) authentication.getPrincipal();
				return springSecurityUser.getUsername();
			} else if (authentication.getPrincipal() instanceof String) {
				return (String) authentication.getPrincipal();
			}
			return null;
		});
	}

	/**
	 * Get the login of the current user id.
	 *
	 * @return the login of the current user id.
	 */
	public static Optional getCurrentUserId() {
		SecurityContext securityContext = SecurityContextHolder.getContext();
		return Optional.ofNullable(securityContext.getAuthentication()).map(authentication -> {
			if (authentication.getPrincipal() instanceof User) {
				User springSecurityUser = (User) authentication.getPrincipal();
				return springSecurityUser.getId();
			}
			return null;
		});
	}

	/**
	 * Get the JWT of the current user.
	 *
	 * @return the JWT of the current user.
	 */
	public static Optional getCurrentUserJWT() {
		SecurityContext securityContext = SecurityContextHolder.getContext();
		return Optional.ofNullable(securityContext.getAuthentication())
				.filter(authentication -> authentication.getCredentials() instanceof String)
				.map(authentication -> (String) authentication.getCredentials());
	}


	/**
	 * If the current user has a specific authority (security role).
	 * 
	 * The name of this method comes from the {@code isUserInRole()} method in the Servlet API.
	 *
	 * @param authority the authority to check.
	 * @return true if the current user has the authority, false otherwise.
	 */
	public static boolean isCurrentUserInRole(String authority) {
		SecurityContext securityContext = SecurityContextHolder.getContext();
		return Optional.ofNullable(securityContext.getAuthentication())
				.map(authentication -> authentication.getAuthorities().stream()
						.anyMatch(grantedAuthority -> grantedAuthority.getAuthority().equals(authority))).orElse(false);
	}
}