org.springframework.security.web.header.writers.frameoptions.AbstractRequestParameterAllowFromStrategy Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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
*
* http://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.frameoptions;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import javax.servlet.http.HttpServletRequest;
/**
* Base class for AllowFromStrategy implementations which use a request parameter to
* retrieve the origin. By default the parameter named x-frames-allow-from is
* read from the request.
*
* @author Marten Deinum
* @since 3.2
*/
abstract class AbstractRequestParameterAllowFromStrategy implements AllowFromStrategy {
private static final String DEFAULT_ORIGIN_REQUEST_PARAMETER = "x-frames-allow-from";
private String allowFromParameterName = DEFAULT_ORIGIN_REQUEST_PARAMETER;
/** Logger for use by subclasses */
protected final Log log = LogFactory.getLog(getClass());
public String getAllowFromValue(HttpServletRequest request) {
String allowFromOrigin = request.getParameter(allowFromParameterName);
if (log.isDebugEnabled()) {
log.debug("Supplied origin '" + allowFromOrigin + "'");
}
if (StringUtils.hasText(allowFromOrigin) && allowed(allowFromOrigin)) {
return allowFromOrigin;
}
else {
return "DENY";
}
}
/**
* Sets the HTTP parameter used to retrieve the value for the origin that is allowed
* from. The value of the parameter should be a valid URL. The default parameter name
* is "x-frames-allow-from".
*
* @param allowFromParameterName the name of the HTTP parameter to
*/
public void setAllowFromParameterName(String allowFromParameterName) {
Assert.notNull(allowFromParameterName, "allowFromParameterName cannot be null");
this.allowFromParameterName = allowFromParameterName;
}
/**
* Method to be implemented by base classes, used to determine if the supplied origin
* is allowed.
*
* @param allowFromOrigin the supplied origin
* @return true if the supplied origin is allowed.
*/
protected abstract boolean allowed(String allowFromOrigin);
}