spring security Token 源码
spring security Token 代码
文件路径：/core/src/main/java/org/springframework/security/core/token/Token.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;
/**
* A token issued by {@link TokenService}.
*
* <p>
* It is important that the keys assigned to tokens are sufficiently randomised and
* secured that they can serve as identifying a unique user session. Implementations of
* {@link TokenService} are free to use encryption or encoding strategies of their choice.
* It is strongly recommended that keys are of sufficient length to balance safety against
* persistence cost. In relation to persistence cost, it is strongly recommended that
* returned keys are small enough for encoding in a cookie.
* </p>
*
* @author Ben Alex
* @since 2.0.1
*/
public interface Token {
/**
* Obtains the randomised, secure key assigned to this token. Presentation of this
* token to {@link TokenService} will always return a <code>Token</code> that is equal
* to the original <code>Token</code> issued for that key.
* @return a key with appropriate randomness and security.
*/
String getKey();
/**
* The time the token key was initially created is available from this method. Note
* that a given token must never have this creation time changed. If necessary, a new
* token can be requested from the {@link TokenService} to replace the original token.
* @return the time this token key was created, in the same format as specified by
* {@link java.util.Date#getTime()}.
*/
long getKeyCreationTime();
/**
* Obtains the extended information associated within the token, which was presented
* when the token was first created.
* @return the user-specified extended information, if any
*/
String getExtendedInformation();
}
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