elephant-mail/src/main/java/org/turro/mail/message/MailUtils.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.mail.message;
 
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.turro.action.Actions;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.security.IUser;
import org.turro.log.WebLoggers;
import org.turro.mail.provider.MailRecipient;
import org.turro.plugin.contacts.IContact;
import org.turro.string.Strings;
 
public class MailUtils {
  
  public static String processMacrosForWeb(IContact contact, String message) {
    message = cleanLinks(message);
    message = processUser(contact, message);
    return message;
  }
 
  public static String processMacros(IContact contact, String message) {
    message = processLinks(contact, message);
    message = processUser(contact, message);
    return message;
  }
 
  /* Links */
  
  public static String processLinks(IContact contact, String message) {
    if(contact != null && contact.isValid() && contact.isWebUser()) {
      String email = contact.getConnector(IUser.CONNECTOR_EMAIL);
      message = processLinks(email, message);
    } else {
      message = cleanLinks(message);
    }
    return message;
  }
  
  public static String processLinks(String email, String message) {
    message = processLiveLinks(email, message);
    message = processLiveRefs(email, message);
    return message;
  }
  
  public static String cleanLinks(String message) {
    message = cleanLiveLinks(message);
    message = cleanLiveRefs(message);
    return message;
  }
  
  public static String processLiveLinks(String email, String message) {
    if(message.contains("{livelink")) {
      Pattern pat = Pattern.compile(LIVE_LINK_PATTERN);
      Matcher mat = pat.matcher(message);
      StringBuffer result = new StringBuffer();
      while(mat.find()) {
        try {
          if(mat.groupCount() > 1 && !Strings.isBlank(mat.group(1)) && !Strings.isBlank(mat.group(2))) {
            String server = ElephantContext.getServerUrl("http") + "?" +
                    Actions.createActionFromElephant(email, URLDecoder.decode(mat.group(2), StandardCharsets.UTF_8.name()));
            mat.appendReplacement(result, "<a href=\"" + server + "\">" + mat.group(1) + "</a>");
          }
        } catch (Exception ex) {
          WebLoggers.severe(MailUtils.class).exception(ex).log();
        }
      }
      mat.appendTail(result);
      return result.toString();
    }
    return message;
  }
 
  public static String processLiveRefs(String email, String message) {
    if(message.contains("{liveref")) {
      Pattern pat = Pattern.compile(LIVE_REF_PATTERN);
      Matcher mat = pat.matcher(message);
      StringBuffer result = new StringBuffer();
      while(mat.find()) {
        try {
          if(mat.groupCount() > 0 && !Strings.isBlank(mat.group(1))) {
            String server = ElephantContext.getServerUrl("http") + "?" +
                    Actions.createActionFromElephant(email, URLDecoder.decode(mat.group(1), StandardCharsets.UTF_8.name()));
            mat.appendReplacement(result, server);
          }
        } catch (Exception ex) {
          WebLoggers.severe(MailUtils.class).exception(ex).log();
        }
      }
      mat.appendTail(result);
      return result.toString();
    }
    return message;
  }
 
  public static String cleanLiveLinks(String message) {
    if(message.contains("{livelink")) {
      Pattern pat = Pattern.compile(LIVE_LINK_PATTERN);
      Matcher mat = pat.matcher(message);
      StringBuffer result = new StringBuffer();
      while(mat.find()) {
        try {
          if(mat.groupCount() > 1 && !Strings.isBlank(mat.group(1)) && !Strings.isBlank(mat.group(2))) {
            mat.appendReplacement(result, "<a href='" + mat.group(2) + "'>" + mat.group(1) + "</a>");
          }
        } catch (Exception ex) {
          WebLoggers.severe(MailUtils.class).exception(ex).log();
        }
      }
      mat.appendTail(result);
      return result.toString();
    }
    return message;
  }
  
  public static String cleanLiveRefs(String message) {
    if(message.contains("{liveref")) {
      Pattern pat = Pattern.compile(LIVE_REF_PATTERN);
      Matcher mat = pat.matcher(message);
      StringBuffer result = new StringBuffer();
      while(mat.find()) {
        try {
          if(mat.groupCount() > 0 && !Strings.isBlank(mat.group(1))) {
            mat.appendReplacement(result, mat.group(1));
          }
        } catch (Exception ex) {
          WebLoggers.severe(MailUtils.class).exception(ex).log();
        }
      }
      mat.appendTail(result);
      return result.toString();
    }
    return message;
  }
  
  private static final String LIVE_LINK_PATTERN = "\\{livelink\\:([^\\:\\}]*)\\:?([^\\:\\}]*)\\}";
  private static final String LIVE_REF_PATTERN = "\\{liveref\\:([^\\:\\}]*)\\}";
  private static final String LINK_PATTERN = "\\{link\\:([^\\:\\}]*)\\:?([^\\:\\}]*)\\}";
 
  /* Images */
  
  public static String processImgWidth(String message) {
    return message.replaceAll("\\<img ", "<img style=\"max-width:100%\" ");
  }
  
  /* User */
  
  public static String processUser(IContact contact, String message) {
    if(contact != null && contact.isValid() && contact.isWebUser()) {
      message = processUser(MailRecipient.of(contact), message);
    }
    return message;
  }
 
  public static String processUser(String email, String name, String message) {
    return processUser(MailRecipient.of(email, name), message);
  }
 
  public static String processUser(MailRecipient recipient, String message) {
    if(!recipient.isEmpty()) {
      message = recipient.parse(message);
    }
    return message;
  }
 
  /* Absolutes */
  
  public static String toAbsolute(String text) {
    String serverBase = ElephantContext.getServerBase("http");
    return text.replaceAll("href=\\'(?![a-z]+:)(\\/?)\\/?([^\\']*)\\'", "href=\\'" + serverBase + "$1$2\\'")
               .replaceAll("src=\\'(?![a-z]+:)(\\/?)\\/?([^\\']*)\\'", "src=\\'" + serverBase + "$1$2\\'")
               .replaceAll("href=\\\"(?![a-z]+:)(\\/?)\\/?([^\\\"]*)\\\"", "href=\\\"" + serverBase + "$1$2\\\"")
               .replaceAll("src=\\\"(?![a-z]+:)(\\/?)\\/?([^\\\"]*)\\\"", "src=\\\"" + serverBase + "$1$2\\\"");
  }
  
}