spring security CsrfRequestDataValueProcessor 源码
spring security CsrfRequestDataValueProcessor 代码
文件路径：/web/src/main/java/org/springframework/security/web/reactive/result/view/CsrfRequestDataValueProcessor.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.reactive.result.view;
import java.util.Collections;
import java.util.Map;
import java.util.regex.Pattern;
import org.springframework.lang.NonNull;
import org.springframework.security.web.server.csrf.CsrfToken;
import org.springframework.web.reactive.result.view.RequestDataValueProcessor;
import org.springframework.web.server.ServerWebExchange;
/**
* @author Rob Winch
* @since 5.0
*/
public class CsrfRequestDataValueProcessor implements RequestDataValueProcessor {
/**
* The default request attribute to look for a {@link CsrfToken}.
*/
public static final String DEFAULT_CSRF_ATTR_NAME = "_csrf";
private static final Pattern DISABLE_CSRF_TOKEN_PATTERN = Pattern.compile("(?i)^(GET|HEAD|TRACE|OPTIONS)$");
private static final String DISABLE_CSRF_TOKEN_ATTR = "DISABLE_CSRF_TOKEN_ATTR";
@Override
public String processAction(ServerWebExchange exchange, String action, String httpMethod) {
if (httpMethod != null && DISABLE_CSRF_TOKEN_PATTERN.matcher(httpMethod).matches()) {
exchange.getAttributes().put(DISABLE_CSRF_TOKEN_ATTR, Boolean.TRUE);
}
else {
exchange.getAttributes().remove(DISABLE_CSRF_TOKEN_ATTR);
}
return action;
}
@Override
public String processFormFieldValue(ServerWebExchange exchange, String name, String value, String type) {
return value;
}
@NonNull
@Override
public Map<String, String> getExtraHiddenFields(ServerWebExchange exchange) {
if (Boolean.TRUE.equals(exchange.getAttribute(DISABLE_CSRF_TOKEN_ATTR))) {
exchange.getAttributes().remove(DISABLE_CSRF_TOKEN_ATTR);
return Collections.emptyMap();
}
CsrfToken token = exchange.getAttribute(DEFAULT_CSRF_ATTR_NAME);
if (token == null) {
return Collections.emptyMap();
}
return Collections.singletonMap(token.getParameterName(), token.getToken());
}
@Override
public String processUrl(ServerWebExchange exchange, String url) {
return url;
}
}
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