spring security PermissionsPolicyHeaderWriter 源码
spring security PermissionsPolicyHeaderWriter 代码
文件路径：/web/src/main/java/org/springframework/security/web/header/writers/PermissionsPolicyHeaderWriter.java
/*
* Copyright 2002-2020 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;
import org.springframework.util.Assert;
/**
* Provides support for
* <a href="https://w3c.github.io/webappsec-permissions-policy//">Permisisons Policy</a>.
* <p>
* Permissions Policy allows web developers to selectively enable, disable, and modify the
* behavior of certain APIs and web features in the browser.
* <p>
* A declaration of a permissions policy contains a set of security policies, each
* responsible for declaring the restrictions for a particular feature type.
*
* @author Christophe Gilles
* @since 5.5
*/
public final class PermissionsPolicyHeaderWriter implements HeaderWriter {
private static final String PERMISSIONS_POLICY_HEADER = "Permissions-Policy";
private String policy;
/**
* Create a new instance of {@link PermissionsPolicyHeaderWriter}.
*/
public PermissionsPolicyHeaderWriter() {
}
/**
* Create a new instance of {@link PermissionsPolicyHeaderWriter} with supplied
* security policy.
* @param policy the security policy
* @throws IllegalArgumentException if policy is {@code null} or empty
*/
public PermissionsPolicyHeaderWriter(String policy) {
setPolicy(policy);
}
/**
* Sets the policy to be used in the response header.
* @param policy a permissions policy
* @throws IllegalArgumentException if policy is null
*/
public void setPolicy(String policy) {
Assert.hasLength(policy, "policy can not be null or empty");
this.policy = policy;
}
@Override
public void writeHeaders(HttpServletRequest request, HttpServletResponse response) {
if (!response.containsHeader(PERMISSIONS_POLICY_HEADER)) {
response.setHeader(PERMISSIONS_POLICY_HEADER, this.policy);
}
}
@Override
public String toString() {
return getClass().getName() + " [policy=" + this.policy + "]";
}
}
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