ExternalApiRoleProvider.java

/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.external.userdirectory;

import org.opencastproject.security.api.JaxbOrganization;
import org.opencastproject.security.api.JaxbRole;
import org.opencastproject.security.api.Organization;
import org.opencastproject.security.api.Role;
import org.opencastproject.security.api.Role.Type;
import org.opencastproject.security.api.RoleProvider;
import org.opencastproject.security.api.SecurityService;
import org.opencastproject.security.api.UserProvider;

import com.entwinemedia.fn.Fn2;
import com.entwinemedia.fn.Stream;
import com.entwinemedia.fn.StreamOp;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.osgi.service.component.ComponentContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Pattern;

/**
 * The External API role provider.
 */
public class ExternalApiRoleProvider implements RoleProvider {

  /** The logger */
  private static final Logger logger = LoggerFactory.getLogger(ExternalApiRoleProvider.class);

  /** The security service */
  protected SecurityService securityService = null;

  private Set<String> roles;

  /**
   * @param securityService
   *          the securityService to set
   */
  public void setSecurityService(SecurityService securityService) {
    this.securityService = securityService;
  }

  protected void activate(ComponentContext cc) {
    String rolesFile = ExternalGroupLoader.ROLES_PATH_PREFIX + File.separator + ExternalGroupLoader.EXTERNAL_APPLICATIONS_ROLES_FILE;
    InputStream in = null;
    try {
      in = getClass().getResourceAsStream(rolesFile);
      roles = new TreeSet<>(IOUtils.readLines(in, "UTF-8"));
    } catch (IOException e) {
      logger.error("Unable to read available roles: {}", ExceptionUtils.getStackTrace(e));
    } finally {
      IOUtils.closeQuietly(in);
    }
    logger.info("Activated External API role provider");
  }

  /**
   * @see org.opencastproject.security.api.RoleProvider#getRoles()
   */
  @Override
  public Iterator<Role> getRoles() {
    Organization organization = securityService.getOrganization();
    return Stream.$(roles).map(toRole._2(organization)).iterator();
  }

  /**
   * @see org.opencastproject.security.api.RoleProvider#getRolesForUser(String)
   */
  @Override
  public List<Role> getRolesForUser(String userName) {
    return Collections.emptyList();
  }

  /**
   * @see org.opencastproject.security.api.RoleProvider#getOrganization()
   */
  @Override
  public String getOrganization() {
    return UserProvider.ALL_ORGANIZATIONS;
  }

  /**
   * @see org.opencastproject.security.api.RoleProvider#findRoles(String, Role.Target, int, int)
   */
  @Override
  public Iterator<Role> findRoles(String query, Role.Target target, int offset, int limit) {
    if (query == null)
      throw new IllegalArgumentException("Query must be set");

    // These roles are not meaningful for use in ACLs
    if (target == Role.Target.ACL) {
      return Collections.emptyIterator();
    }

    Organization organization = securityService.getOrganization();
    return Stream.$(roles).filter(filterByName._2(query)).drop(offset)
            .apply(limit > 0 ? StreamOp.<String> id().take(limit) : StreamOp.<String> id()).map(toRole._2(organization))
            .iterator();
  }

  private static boolean like(String string, final String query) {
    String regex = query.replace("_", ".").replace("%", ".*?");
    Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.DOTALL);
    return p.matcher(string).matches();
  }

  private static final Fn2<String, Organization, Role> toRole = new Fn2<String, Organization, Role>() {
    @Override
    public Role apply(String role, Organization organization) {
      return new JaxbRole(role, JaxbOrganization.fromOrganization(organization), "External API Role", Type.INTERNAL);
    }
  };

  private static final Fn2<String, String, Boolean> filterByName = new Fn2<String, String, Boolean>() {
    @Override
    public Boolean apply(String role, String query) {
      return like(role, query);
    }
  };
}