java source code of JsetsModularRealmAuthenticator

/*
 * Copyright 2017-2018 the original author(https://github.com/wj596)
 * 
 * <p>
 * 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
 *
 *     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.
 * </p>
 */
package org.jsets.shiro.session;

import java.util.List;
import static java.util.stream.Collectors.*;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.pam.ModularRealmAuthenticator;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.util.CollectionUtils;

/**
 * 扩展自ModularRealmAuthenticator,认证开始先过滤掉不支持token类型的realm
 * 
 * @author wangjie (https://github.com/wj596)
 * @date 2016年6月31日
 */
public class JsetsModularRealmAuthenticator extends ModularRealmAuthenticator {

	protected AuthenticationInfo doAuthenticate(AuthenticationToken authenticationToken) throws AuthenticationException {
		assertRealmsConfigured();
		List<Realm> realms = this.getRealms()
			.stream()
			.filter(realm -> {
					return realm.supports(authenticationToken);
			})
			.collect(toList());
		if (CollectionUtils.isEmpty(realms)) 
			throw new IllegalStateException("Configuration error:  No realms support token type:" + authenticationToken.getClass());
		
		if (realms.size() == 1) {
			return doSingleRealmAuthentication(realms.iterator().next(), authenticationToken);
		} else {
			return doMultiRealmAuthentication(realms, authenticationToken);
		}
	}
	
}