SpringSecurity学习

AuthenticationManager

AuthenticationManager接口为springsecurity的接口之一，字面意思为认证管理器，该接口负责把将要认证对象进行校验，
1.首先检查该账号是否被禁用，如果禁用的话而且该账号能够被检测的话，就抛出DisabledException。
2.然后检查该账号是否被锁住，如果被锁住而且该账号能够被检测的话，就抛出LockedException
3.如果出现不正确的凭据，则必须抛出{@link BadCredentialsException}。
虽然上面异常可以选择，但是AuthenticationManager始终都会检测第三点的凭据。

下面时源码`

/*
 * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * 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.authentication;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;

/**
 * Processes an {@link Authentication} request.
 *
 * @author Ben Alex
 */
public interface AuthenticationManager {

	/**
	 * Attempts to authenticate the passed {@link Authentication} object, returning a
	 * fully populated Authentication object (including granted authorities)
	 * if successful.
	 * 

	 * An AuthenticationManager must honour the following contract concerning
	 * exceptions:
	 * 

	 * 
A {@link DisabledException} must be thrown if an account is disabled and the
	 * AuthenticationManager can test for this state.
	 * 
A {@link LockedException} must be thrown if an account is locked and the
	 * AuthenticationManager can test for account locking.
	 * 
A {@link BadCredentialsException} must be thrown if incorrect credentials are
	 * presented. Whilst the above exceptions are optional, an
	 * AuthenticationManager must always test credentials.
	 * 
	 * Exceptions should be tested for and if applicable thrown in the order expressed
	 * above (i.e. if an account is disabled or locked, the authentication request is
	 * immediately rejected and the credentials testing process is not performed). This
	 * prevents credentials being tested against disabled or locked accounts.
	 * @param authentication the authentication request object
	 * @return a fully authenticated object including credentials
	 * @throws AuthenticationException if authentication fails
	 */
	Authentication authenticate(Authentication authentication) throws AuthenticationException;

}