spring security CacheControlHeadersWriter 源码
spring security CacheControlHeadersWriter 代码
文件路径：/web/src/main/java/org/springframework/security/web/header/writers/CacheControlHeadersWriter.java
/*
* Copyright 2002-2018 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.web.header.writers;
import java.util.ArrayList;
import java.util.List;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.http.HttpStatus;
import org.springframework.security.web.header.Header;
import org.springframework.security.web.header.HeaderWriter;
/**
* Inserts headers to prevent caching if no cache control headers have been specified.
* Specifically it adds the following headers:
* <ul>
* <li>Cache-Control: no-cache, no-store, max-age=0, must-revalidate</li>
* <li>Pragma: no-cache</li>
* <li>Expires: 0</li>
* </ul>
*
* @author Rob Winch
* @since 3.2
*/
public final class CacheControlHeadersWriter implements HeaderWriter {
private static final String EXPIRES = "Expires";
private static final String PRAGMA = "Pragma";
private static final String CACHE_CONTROL = "Cache-Control";
private final HeaderWriter delegate;
/**
* Creates a new instance
*/
public CacheControlHeadersWriter() {
this.delegate = new StaticHeadersWriter(createHeaders());
}
@Override
public void writeHeaders(HttpServletRequest request, HttpServletResponse response) {
if (hasHeader(response, CACHE_CONTROL) || hasHeader(response, EXPIRES) || hasHeader(response, PRAGMA)
|| response.getStatus() == HttpStatus.NOT_MODIFIED.value()) {
return;
}
this.delegate.writeHeaders(request, response);
}
private boolean hasHeader(HttpServletResponse response, String headerName) {
return response.getHeader(headerName) != null;
}
private static List<Header> createHeaders() {
List<Header> headers = new ArrayList<>(3);
headers.add(new Header(CACHE_CONTROL, "no-cache, no-store, max-age=0, must-revalidate"));
headers.add(new Header(PRAGMA, "no-cache"));
headers.add(new Header(EXPIRES, "0"));
return headers;
}
}
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