/*
    * Copyright 2012-2021 CodeLibs Project and the Others.
    *
    * Licensed under the Apache 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://www.apache.org/licenses/LICENSE-2.0
    *
   * 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.codelibs.fess.sso;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.codelibs.fess.mylasta.action.FessUserBean;
  import org.codelibs.fess.util.ComponentUtil;
  import org.lastaflute.web.login.credential.LoginCredential;
  import org.lastaflute.web.response.ActionResponse;
  
  public class SsoManager {
      private static final Logger logger = LogManager.getLogger(SsoManager.class);
  
      protected static final String SSO_TYPE = "sso.type";
  
      protected static final String NONE = "none";
  
      protected final List<SsoAuthenticator> authenticatorList = new ArrayList<>();
  
      public boolean available() {
          final String ssoType = getSsoType();
          if (logger.isDebugEnabled()) {
              logger.debug("sso.type: {}", ssoType);
          }
          return !NONE.equals(ssoType);
      }
  
      public LoginCredential getLoginCredential() {
          if (available()) {
              final SsoAuthenticator authenticator = getAuthenticator();
              if (authenticator != null) {
                  return authenticator.getLoginCredential();
              }
          }
          return null;
      }
  
      public ActionResponse getResponse(final SsoResponseType responseType) {
          if (available()) {
              final SsoAuthenticator authenticator = getAuthenticator();
              if (authenticator != null) {
                  return authenticator.getResponse(responseType);
              }
          }
          return null;
      }
  
      public String logout(final FessUserBean user) {
          if (available()) {
              final SsoAuthenticator authenticator = getAuthenticator();
              if (authenticator != null) {
                  return authenticator.logout(user);
              }
          }
          return null;
      }
  
      protected SsoAuthenticator getAuthenticator() {
          final String name = getSsoType() + "Authenticator";
          if (ComponentUtil.hasComponent(name)) {
              return ComponentUtil.getComponent(name);
          }
          return null;
      }
  
      protected String getSsoType() {
          return ComponentUtil.getFessConfig().getSystemProperty(SSO_TYPE, NONE);
      }
  
      public SsoAuthenticator[] getAuthenticators() {
          return authenticatorList.toArray(new SsoAuthenticator[authenticatorList.size()]);
      }
  
      public void register(final SsoAuthenticator authenticator) {
          if (logger.isInfoEnabled()) {
              logger.info("Load {}", authenticator.getClass().getSimpleName());
          }
          authenticatorList.add(authenticator);
      }
  }