GlobalAuthorisationProvider.java

/**
 * Copyright (c) 2011, Thilo Planz. All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package v7db.files;

import java.util.Properties;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;

import v7db.auth.AuthenticationToken;
import v7db.files.mongodb.V7File;

class GlobalAuthorisationProvider implements AuthorisationProvider {

	private final Properties props;

	GlobalAuthorisationProvider(Properties props) {
		this.props = props;
	}

	String getProperty(String name) {
		return props.getProperty(name);
	}

	private String getAnonymousUser() {
		return getProperty("auth.anonymous");
	}

	/**
	 * handles anonymous user
	 * 
	 * @return null, if no access should be allowed
	 */
	Object[] getRoles(AuthenticationToken user) {
		if (user == null || user == AuthenticationToken.ANONYMOUS) {
			String a = getAnonymousUser();
			if (StringUtils.isBlank(a))
				return null;
			return new String[] { a };
		} else {
			return user.getRoles();
		}
	}

	private boolean authorise(V7File resource, AuthenticationToken user,
			String permission) {
		Object[] roles = getRoles(user);
		if (roles == null)
			return false;

		String[] acl = StringUtils.stripAll(StringUtils.split(
				getProperty(permission), ','));
		for (Object role : roles) {
			if (ArrayUtils.contains(acl, role))
				return true;
		}
		return false;
	}

	public boolean authoriseOpen(V7File resource, AuthenticationToken user) {
		return authoriseRead(resource, user);
	}

	public boolean authoriseRead(V7File resource, AuthenticationToken user) {
		return authorise(resource, user, "acl.read");
	}

	public boolean authoriseWrite(V7File resource, AuthenticationToken user) {
		return authorise(resource, user, "acl.write");
	}

}