spring HeaderWebSessionIdResolver 源码
spring HeaderWebSessionIdResolver 代码
文件路径：/spring-web/src/main/java/org/springframework/web/server/session/HeaderWebSessionIdResolver.java
/*
* Copyright 2002-2022 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.web.server.session;
import java.util.Collections;
import java.util.List;
import org.springframework.http.HttpHeaders;
import org.springframework.util.Assert;
import org.springframework.web.server.ServerWebExchange;
/**
* Request and response header-based {@link WebSessionIdResolver}.
*
* @author Greg Turnquist
* @author Rob Winch
* @since 5.0
*/
public class HeaderWebSessionIdResolver implements WebSessionIdResolver {
/** Default value for {@link #setHeaderName(String)}. */
public static final String DEFAULT_HEADER_NAME = "SESSION";
private String headerName = DEFAULT_HEADER_NAME;
/**
* Set the name of the session header to use for the session ID.
* <p>The name is used to extract the session ID from the request headers as
* well to set the session ID on the response headers.
* <p>By default set to {@code DEFAULT_HEADER_NAME}
* @param headerName the header name
*/
public void setHeaderName(String headerName) {
Assert.hasText(headerName, "'headerName' must not be empty");
this.headerName = headerName;
}
/**
* Get the configured header name.
* @return the configured header name
*/
public String getHeaderName() {
return this.headerName;
}
@Override
public List<String> resolveSessionIds(ServerWebExchange exchange) {
HttpHeaders headers = exchange.getRequest().getHeaders();
return headers.getOrDefault(getHeaderName(), Collections.emptyList());
}
@Override
public void setSessionId(ServerWebExchange exchange, String id) {
Assert.notNull(id, "'id' is required.");
exchange.getResponse().getHeaders().set(getHeaderName(), id);
}
@Override
public void expireSession(ServerWebExchange exchange) {
this.setSessionId(exchange, "");
}
}
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