spring security TokenService 源码
spring security TokenService 代码
文件路径：/core/src/main/java/org/springframework/security/core/token/TokenService.java
/*
* Copyright 2002-2016 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.core.token;
/**
* Provides a mechanism to allocate and rebuild secure, randomised tokens.
*
* <p>
* Implementations are solely concern with issuing a new {@link Token} on demand. The
* issued <code>Token</code> may contain user-specified extended information. The token
* also contains a cryptographically strong, byte array-based key. This permits the token
* to be used to identify a user session, if desired. The key can subsequently be
* re-presented to the <code>TokenService</code> for verification and reconstruction of a
* <code>Token</code> equal to the original <code>Token</code>.
* </p>
*
* <p>
* Given the tightly-focused behaviour provided by this interface, it can serve as a
* building block for more sophisticated token-based solutions. For example,
* authentication systems that depend on stateless session keys. These could, for
* instance, place the username inside the user-specified extended information associated
* with the key). It is important to recognise that we do not intend for this interface to
* be expanded to provide such capabilities directly.
* </p>
*
* @author Ben Alex
* @since 2.0.1
*
*/
public interface TokenService {
/**
* Forces the allocation of a new {@link Token}.
* @param extendedInformation the extended information desired in the token (cannot be
* <code>null</code>, but can be empty)
* @return a new token that has not been issued previously, and is guaranteed to be
* recognised by this implementation's {@link #verifyToken(String)} at any future
* time.
*/
Token allocateToken(String extendedInformation);
/**
* Permits verification the {@link Token#getKey()} was issued by this
* <code>TokenService</code> and reconstructs the corresponding <code>Token</code>.
* @param key as obtained from {@link Token#getKey()} and created by this
* implementation
* @return the token, or <code>null</code> if the token was not issued by this
* <code>TokenService</code>
*/
Token verifyToken(String key);
}
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