package com.carmichaeldata.utils.email;

import java.io.*;
import java.net.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class send extends HttpServlet
{
  public void service( HttpServletRequest _req,
      HttpServletResponse _res)
      throws ServletException, IOException {

    EmailRedirect target = new EmailRedirect();
    if ( _req.getParameter("U") != null )
    {
      String user = _req.getParameter("U");
      if ( _req.getParameter("D") != null )
      {
        String domain = _req.getParameter("D");

        Enumeration e = _req.getHeaderNames();
        while (e.hasMoreElements())
        {
          String name = (String) e.nextElement();
          String header = _req.getHeader(name);
          if (name.equals("User-Agent"))
          {
            if (header.length() > 0)
            {
              target.setDest(user, domain);
              break;
            }
          }
        }
      }
    }
    if (target.getOkToProcess())
    {
      _res.sendRedirect(target.getRedirectString());
    }
  }
}

public class EmailRedirect {
  String user, domain, subject, body;

  public void setDest(String _user, String _domain) {
    if (_user != null)
      user = _user;
    if (_domain != null)
      domain =  _domain;
  }

  public void setSubject(String _subject) {
    if (_subject != null)
      subject = _subject;
  }

  public void setBody(String _body) {
    if (_body != null)
      body = _body;
  }

  public String getRedirect() {
    String ret="";
    if (subject != null)
    {
      ret="?subject="+subject;
    }
    if (body != null)
    {
      ret+= "&body="+body;
    }
    return getRedirectString()+ret;
  }

  public String getRedirectString() {
    return("mailto:"+user+"@"+domain);
  }

  public boolean getOkToProcess()
  {
    if (user == "") return false;
    if (domain == "") return false;
    if (user.length() == 0) return false;
    if (domain.length() == 0) return false;
    return true;
  }
}