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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2011 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WT_MAIL_CLIENT_H_
#define WT_MAIL_CLIENT_H_

#include <string>
#include <Wt/WDllDefs.h>

namespace Wt {

  /*! \brief Namespace for the \ref mail
   */
  namespace Mail {

class Message;

/*! \defgroup mail SMTP client library (Wt::Mail)
 *  \brief An SMTP client implementation.
 */

/*! \class Client Wt/Mail/Client Wt/Mail/Client
 *  \brief An SMTP mail client.
 *
 * The SMTP client can send one or more mail messages to an SMTP host.
 *
 * \code
 * #include <Wt/Mail/Client>
 * #include <Wt/Mail/Message>
 * 
 * Mail::Message message;
 * message.setFrom(Mail::Mailbox("kudos@corp.org", "Kudos Dukos");
 * message.addRecipient(Mail::To, Mail::Mailbox("koen@emweb.be", "Koen Deforche");
 * message.setSubject("Hey there, koen!");
 * message.setBody("That mail client seems to be working.");
 * message.addHtmlBody ("<p>" 
 *      "<a href=\"http://www.webtoolkit.eu/wt\">That mail client</a>" 
 *      " seems to be working just great!</p>");
 *
 * Mail::Client client;
 * client.connect("localhost");
 * client.send(message);
 * \endcode
 *
 * Only the bare essentials of the SMTP protocol are current implemented,
 * although the Message itself supports proper unicode handling.
 *
 * \note Currently only a plain-text SMTP protocol is supported. SSL
 *       transport will be added in the future.
 *
 * \note Currently the client sends an email synchronously, and thus a slow
 *       connection to the SMTP server may block the current thread. We plan
 *       to change this in the future. It is thus beneficial to connect to a
 *       local SMTP daemon to minimize this deficiency.
 *
 * \ingroup mail
 */
class WT_API Client
{
public:
  /*! \brief Constructor.
   *
   * The \p selfHost is how the mail client will identify itself to the
   * mail server, in the EHLO command.
   *
   * If not defined, the "smtp-self-host" configuration property is used, and
   * if that property is not defined, it defaults to "localhost".
   */
  Client(const std::string& selfHost = std::string());

  /*! \brief Destructor.
   *
   * If the client is still connected, this disconnects the client.
   */
  ~Client();

  /*! \brief Connects to the default SMTP server.
   *
   * This connects to the SMTP server defined by the "smtp-host"
   * property, on port defined by the "smtp-port" property. If these
   * properties are not set, "localhost" and 25 are used as defaults
   * respectively.
   *
   * Returns whether the connection could be established and the SMTP
   * hand-shake was successful.
   */
  bool connect();

  /*! \brief Connects to a given STMP server and port.
   *
   * Returns whether the connection could be established and the SMTP
   * hand-shake was successful.
   */
  bool connect(const std::string& smtpHost, int smtpPort = 25);

  /*! \brief Disconnects the client from the SMTP server.
   */
  void disconnect();

  /*! \brief Sends a message.
   *
   * The client must be connected before messages can be sent.
   *
   * The function returns true on success, false on error. The
   * reason for the error is logged in the log file.
   */
  bool send(const Message& message);

private:
  Client(const Client&);
  class Impl;

  Impl *impl_;
  std::string selfHost_;
};

  }
}

#endif // WT_EMAIL_CLIENT_H_