EmailAccountUtils.java

/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.jasig.portlet.emailpreview.util;

import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.portlet.PortletPreferences;
import javax.portlet.PortletRequest;
import org.apache.commons.lang3.StringUtils;
import org.jasig.portlet.emailpreview.MailStoreConfiguration;
import org.jasig.portlet.emailpreview.service.auth.IAuthenticationService;

public final class EmailAccountUtils {

  private static final Pattern DOMAIN_PATTERN =
      Pattern.compile("\\.([a-zA-Z0-9]+\\.[a-zA-Z0-9]+)\\z");
  private static final Pattern IP_ADDRESS_PATTERN =
      Pattern.compile(
          "\\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b");
  private static final String MAIL = "mail";

  public static String determineUserEmailAddress(
      final PortletRequest req,
      final MailStoreConfiguration config,
      final IAuthenticationService authService) {

    String emailAddress = null;
    final PortletPreferences prefs = req.getPreferences();
    if (config.isDisplayMailAttribute()) {
      final Map<String, String> userInfo =
          (Map<String, String>) req.getAttribute(PortletRequest.USER_INFO);
      emailAddress = userInfo.get(MAIL);
      if (StringUtils.isNotBlank(emailAddress)) {
        return emailAddress;
      }
    }
    final String mailAccount = authService.getMailAccountName(req, config);
    final String nameSuffix = config.getUsernameSuffix();
    final String serverName = config.getHost();
    if (mailAccount.contains("@")) {
      emailAddress = mailAccount;
    } else if (StringUtils.isNotBlank(nameSuffix)) {
      emailAddress = mailAccount + nameSuffix;
    } else if (IP_ADDRESS_PATTERN.matcher(serverName).find()) {
      emailAddress = mailAccount;
    } else {
      emailAddress = mailAccount;
      final Matcher m = DOMAIN_PATTERN.matcher(serverName);
      if (m.find()) {
        emailAddress = emailAddress + "@" + m.group(1);
      }
    }
    return emailAddress;
  }
}