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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.rest;

import com.github.sardine.Sardine;
import com.github.sardine.impl.SardineImpl;
import com.google.common.cache.CacheLoader;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.apache.commons.lang3.StringUtils;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;

@Slf4j
public class SardineCacheLoader extends CacheLoader {

  @Override
  public Sardine load(String username) throws Exception {
    Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
    checkUsername(username, authentication);
    return createSardineImplementation(authentication);
  }

  private void checkUsername(String username, Authentication authentication) {
    log.debug("Check if the Username {} equals to the Name of the Authentication {}", username, authentication.getName());
    if (!StringUtils.equals(username, authentication.getName())) {
      val logMessage = String.format("requested Username %s does not equal to the Username of the SecurityContextHolder %s", username, authentication.getName());
      log.error(logMessage);
      throw new IllegalStateException(logMessage);
    }
  }

  private Sardine createSardineImplementation(Authentication authentication) {
    UserDetails userDetails = (UserDetails) authentication.getPrincipal();
    String username = userDetails.getUsername();
    log.debug("Create Sardine Implementation based on the UserDetails Object of User {}", username);
    return new SardineImpl(username, userDetails.getPassword());
  }

}