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/**
 * Copyright (c) 2011-2013, dafei 李飞 (myaniu AT gmail DOT com)
 *
 * 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 com.janeluo.jfinalplus.plugin.shiro;

import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.annotation.Logical;
import org.apache.shiro.authz.annotation.RequiresPermissions;
import org.apache.shiro.subject.Subject;

import java.lang.annotation.Annotation;

/**
 * 基于权限的访问控制处理器，非单例模式运行。
 * @author dafei
 *
 */
class PermissionAuthzHandler extends AbstractAuthzHandler {
	private final Annotation annotation;

	public PermissionAuthzHandler(Annotation annotation) {
		this.annotation = annotation;
	}

	@Override
    public void assertAuthorized() throws AuthorizationException {
		if (!(annotation instanceof RequiresPermissions))
			return;

		RequiresPermissions rpAnnotation = (RequiresPermissions) annotation;
		String[] perms = rpAnnotation.value();
		Subject subject = getSubject();

		if (perms.length == 1) {
			subject.checkPermission(perms[0]);
			return;
		}
		if (Logical.AND.equals(rpAnnotation.logical())) {
			getSubject().checkPermissions(perms);
			return;
		}
		if (Logical.OR.equals(rpAnnotation.logical())) {
			// Avoid processing exceptions unnecessarily - "delay" throwing the
			// exception by calling hasRole first
			boolean hasAtLeastOnePermission = false;
			for (String permission : perms)
				if (getSubject().isPermitted(permission))
					hasAtLeastOnePermission = true;
			// Cause the exception if none of the role match, note that the
			// exception message will be a bit misleading
			if (!hasAtLeastOnePermission)
				getSubject().checkPermission(perms[0]);

		}

	}

}