/*
    * DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
    * Copyright (C) 2010  Mickael Guessant
    *
    * 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 2
    * 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, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   */
  
  package davmail.exchange.auth;
  
  import davmail.Settings;
  import davmail.http.HttpClientAdapter;
  import org.apache.log4j.Logger;
  
  import java.io.IOException;
  import java.net.URI;
  
  /**
   * Experimental: load Oauth2 token from settings
   */
  @SuppressWarnings("unused")
  public class O365StoredTokenAuthenticator implements ExchangeAuthenticator {
      private static final Logger LOGGER = Logger.getLogger(O365StoredTokenAuthenticator.class);
  
      URI ewsUrl = URI.create(Settings.getO365Url());
  
      private String username;
      private String password;
      private O365Token token;
  
      @Override
      public void setUsername(String username) {
          this.username = username;
      }
  
      @Override
      public void setPassword(String password) {
          this.password = password;
      }
  
      /**
       * Return a pool enabled HttpClientAdapter instance to access O365
       * @return HttpClientAdapter instance
       */
      @Override
      public HttpClientAdapter getHttpClientAdapter() {
          return new HttpClientAdapter(getExchangeUri(), username, password, true);
      }
  
      @Override
      public void authenticate() throws IOException {
          // common DavMail client id
          final String clientId = Settings.getProperty("davmail.oauth.clientId", "facd6cff-a294-4415-b59f-c5b01937d7bd");
          // standard native app redirectUri
          final String redirectUri = Settings.getProperty("davmail.oauth.redirectUri", Settings.getO365LoginUrl()+"/common/oauth2/nativeclient");
          // company tenantId or common
          String tenantId = Settings.getProperty("davmail.oauth.tenantId", "common");
  
          String refreshToken = Settings.getProperty("davmail.oauth."+username.toLowerCase()+".refreshToken");
          if (refreshToken == null) {
              // single user mode
              refreshToken = Settings.getProperty("davmail.oauth.refreshToken");
          }
          String accessToken = Settings.getProperty("davmail.oauth.accessToken");
          if (refreshToken == null && accessToken == null) {
              LOGGER.warn("No stored Oauth refresh token found for "+username);
              throw new IOException("No stored Oauth refresh token found for "+username);
          }
  
          token = new O365Token(tenantId, clientId, redirectUri, password);
          if (accessToken != null) {
              // for tests only: load access token, will expire in at most one hour
              token.setAccessToken(accessToken);
          } else {
              token.setRefreshToken(refreshToken);
              token.refreshToken();
          }
      }
  
      @Override
      public O365Token getToken() {
          return token;
      }
  
      @Override
      public URI getExchangeUri() {
          return ewsUrl;
      }
 }