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Spring Boot Owncloud Service and Authentication Provider

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/*-
 * #%L
 * owncloud-spring-boot-starter
 * %%
 * Copyright (C) 2016 - 2017 by the original Authors
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
package software.coolstuff.springframework.owncloud.service.impl;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.mapping.GrantedAuthoritiesMapper;
import software.coolstuff.springframework.owncloud.model.OwncloudUserDetails;
import software.coolstuff.springframework.owncloud.service.api.OwncloudGrantedAuthoritiesMapper;

import java.util.Collection;

@RequiredArgsConstructor
@Slf4j
public class OwncloudGrantedAuthoritiesMappingServiceImpl implements OwncloudGrantedAuthoritiesMappingService {

  private final OwncloudGrantedAuthoritiesMapper owncloudGrantedAuthoritiesMapper;
  private final GrantedAuthoritiesMapper grantedAuthoritiesMapper;

  @Override
  public Collection mapGrantedAuthorities(OwncloudUserDetails userDetails) {
    if (owncloudGrantedAuthoritiesMapper != null) {
      log.debug("Map the Authorities of User {} by {} ({})", userDetails.getUsername(), OwncloudGrantedAuthoritiesMapper.class, owncloudGrantedAuthoritiesMapper.getClass());
      return owncloudGrantedAuthoritiesMapper.mapAuthorities(userDetails.getUsername(), userDetails.getAuthorities());
    } else if (grantedAuthoritiesMapper != null) {
      log.debug("Map the Authorities of User {} by {} ({})", userDetails.getUsername(), GrantedAuthoritiesMapper.class, grantedAuthoritiesMapper.getClass());
      return grantedAuthoritiesMapper.mapAuthorities(userDetails.getAuthorities());
    }
    log.debug("Return unmodified granted Authorities of User {}", userDetails.getUsername());
    return userDetails.getAuthorities();
  }
}