spring security DefaultWebInvocationPrivilegeEvaluator 源码

spring security DefaultWebInvocationPrivilegeEvaluator 代码

文件路径：/web/src/main/java/org/springframework/security/web/access/DefaultWebInvocationPrivilegeEvaluator.java

/*
 * Copyright 2002-2021 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.access;

import java.util.Collection;

import jakarta.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.core.log.LogMessage;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.FilterInvocation;
import org.springframework.util.Assert;
import org.springframework.web.context.ServletContextAware;

/**
 * Allows users to determine whether they have privileges for a given web URI.
 *
 * @author Ben Alex
 * @author Luke Taylor
 * @since 3.0
 */
public class DefaultWebInvocationPrivilegeEvaluator implements WebInvocationPrivilegeEvaluator, ServletContextAware {

	protected static final Log logger = LogFactory.getLog(DefaultWebInvocationPrivilegeEvaluator.class);

	private final AbstractSecurityInterceptor securityInterceptor;

	private ServletContext servletContext;

	public DefaultWebInvocationPrivilegeEvaluator(AbstractSecurityInterceptor securityInterceptor) {
		Assert.notNull(securityInterceptor, "SecurityInterceptor cannot be null");
		Assert.isTrue(FilterInvocation.class.equals(securityInterceptor.getSecureObjectClass()),
				"AbstractSecurityInterceptor does not support FilterInvocations");
		Assert.notNull(securityInterceptor.getAccessDecisionManager(),
				"AbstractSecurityInterceptor must provide a non-null AccessDecisionManager");
		this.securityInterceptor = securityInterceptor;
	}

	/**
	 * Determines whether the user represented by the supplied <tt>Authentication</tt>
	 * object is allowed to invoke the supplied URI.
	 * @param uri the URI excluding the context path (a default context path setting will
	 * be used)
	 */
	@Override
	public boolean isAllowed(String uri, Authentication authentication) {
		return isAllowed(null, uri, null, authentication);
	}

	/**
	 * Determines whether the user represented by the supplied <tt>Authentication</tt>
	 * object is allowed to invoke the supplied URI, with the given .
	 * <p>
	 * Note the default implementation of <tt>FilterInvocationSecurityMetadataSource</tt>
	 * disregards the <code>contextPath</code> when evaluating which secure object
	 * metadata applies to a given request URI, so generally the <code>contextPath</code>
	 * is unimportant unless you are using a custom
	 * <code>FilterInvocationSecurityMetadataSource</code>.
	 * @param uri the URI excluding the context path
	 * @param contextPath the context path (may be null, in which case a default value
	 * will be used).
	 * @param method the HTTP method (or null, for any method)
	 * @param authentication the <tt>Authentication</tt> instance whose authorities should
	 * be used in evaluation whether access should be granted.
	 * @return true if access is allowed, false if denied
	 */
	@Override
	public boolean isAllowed(String contextPath, String uri, String method, Authentication authentication) {
		Assert.notNull(uri, "uri parameter is required");
		FilterInvocation filterInvocation = new FilterInvocation(contextPath, uri, method, this.servletContext);
		Collection<ConfigAttribute> attributes = this.securityInterceptor.obtainSecurityMetadataSource()
				.getAttributes(filterInvocation);
		if (attributes == null) {
			return (!this.securityInterceptor.isRejectPublicInvocations());
		}
		if (authentication == null) {
			return false;
		}
		try {
			this.securityInterceptor.getAccessDecisionManager().decide(authentication, filterInvocation, attributes);
			return true;
		}
		catch (AccessDeniedException ex) {
			logger.debug(LogMessage.format("%s denied for %s", filterInvocation, authentication), ex);
			return false;
		}
	}

	@Override
	public void setServletContext(ServletContext servletContext) {
		this.servletContext = servletContext;
	}

}

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