RepositoryPermissionResolver.java

/**
 * Copyright (c) 2010, Sebastian Sdorra
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of SCM-Manager; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */

package com.aquenos.scm.ssh.auth;

//~--- non-JDK imports --------------------------------------------------------

import java.util.Iterator;
import java.util.Locale;

import org.apache.shiro.authz.permission.PermissionResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sonia.scm.repository.PermissionType;
import sonia.scm.security.RepositoryPermission;

import com.google.common.base.Splitter;

/**
 * 
 * @author Sebastian Sdorra
 */
public class RepositoryPermissionResolver implements PermissionResolver {

	/** Field description */
	private static final String TYPE_REPOSITORY = "repository";

	/**
	 * the logger for RepositoryPermissionResolver
	 */
	private static final Logger logger = LoggerFactory
			.getLogger(RepositoryPermissionResolver.class);

	// ~--- methods
	// --------------------------------------------------------------

	/**
	 * Method description
	 * 
	 * 
	 * @param permissionString
	 * 
	 * @return
	 */
	@Override
	public RepositoryPermission resolvePermission(String permissionString) {
		RepositoryPermission permission = null;
		Iterator<String> permissionIt = Splitter.on(':').omitEmptyStrings()
				.trimResults().split(permissionString).iterator();

		if (permissionIt.hasNext()) {
			String type = permissionIt.next();

			if (type.equals(TYPE_REPOSITORY)) {
				permission = createRepositoryPermission(permissionIt);
			} else if (logger.isWarnEnabled()) {
				logger.warn("permission '{}' is not a repository permission",
						permissionString);
			}
		}

		return permission;
	}

	/**
	 * Method description
	 * 
	 * 
	 * @param permissionIt
	 * 
	 * @return
	 */
	private RepositoryPermission createRepositoryPermission(
			Iterator<String> permissionIt) {
		RepositoryPermission permission = null;

		if (permissionIt.hasNext()) {
			String repositoryId = permissionIt.next();

			if (permissionIt.hasNext()) {
				try {
					String typeString = permissionIt.next();

					typeString = typeString.trim().toUpperCase(Locale.ENGLISH);

					PermissionType type = PermissionType.valueOf(typeString);

					permission = new RepositoryPermission(repositoryId, type);
				} catch (IllegalArgumentException ex) {
					logger.warn("type is not a valid permission type", ex);
				}
			} else if (logger.isWarnEnabled()) {
				logger.warn("permission type is missing");
			}
		} else if (logger.isWarnEnabled()) {
			logger.warn("repository id and permission type is missing");
		}

		return permission;
	}
}