spring security XXssProtectionHeaderWriter 源码
spring security XXssProtectionHeaderWriter 代码
文件路径：/web/src/main/java/org/springframework/security/web/header/writers/XXssProtectionHeaderWriter.java
/*
* Copyright 2002-2019 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 jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.security.web.header.HeaderWriter;
/**
* Renders the <a href=
* "https://blogs.msdn.com/b/ieinternals/archive/2011/01/31/controlling-the-internet-explorer-xss-filter-with-the-x-xss-protection-http-header.aspx"
* >X-XSS-Protection header</a>.
*
* @author Rob Winch
* @author Ankur Pathak
* @since 3.2
*/
public final class XXssProtectionHeaderWriter implements HeaderWriter {
private static final String XSS_PROTECTION_HEADER = "X-XSS-Protection";
private boolean enabled;
private boolean block;
private String headerValue;
/**
* Create a new instance
*/
public XXssProtectionHeaderWriter() {
this.enabled = true;
this.block = true;
updateHeaderValue();
}
@Override
public void writeHeaders(HttpServletRequest request, HttpServletResponse response) {
if (!response.containsHeader(XSS_PROTECTION_HEADER)) {
response.setHeader(XSS_PROTECTION_HEADER, this.headerValue);
}
}
/**
* If true, will contain a value of 1. For example:
*
* <pre>
* X-XSS-Protection: 1
* </pre>
*
* or if {@link #setBlock(boolean)} is true
*
*
* <pre>
* X-XSS-Protection: 1; mode=block
* </pre>
*
* If false, will explicitly disable specify that X-XSS-Protection is disabled. For
* example:
*
* <pre>
* X-XSS-Protection: 0
* </pre>
* @param enabled the new value
*/
public void setEnabled(boolean enabled) {
if (!enabled) {
setBlock(false);
}
this.enabled = enabled;
updateHeaderValue();
}
/**
* If false, will not specify the mode as blocked. In this instance, any content will
* be attempted to be fixed. If true, the content will be replaced with "#".
* @param block the new value
*/
public void setBlock(boolean block) {
if (!this.enabled && block) {
throw new IllegalArgumentException("Cannot set block to true with enabled false");
}
this.block = block;
updateHeaderValue();
}
private void updateHeaderValue() {
if (!this.enabled) {
this.headerValue = "0";
return;
}
this.headerValue = "1";
if (this.block) {
this.headerValue += "; mode=block";
}
}
@Override
public String toString() {
return getClass().getName() + " [headerValue=" + this.headerValue + "]";
}
}
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