drupal/modules/jabber.module

<?php
// $Id$

function jabber_system($field){
  $system["description"] = t("Enables login with Jabber ID and password.");
  return $system[$field];
}

function jabber_info($field = 0) {
  $info["name"] = "Jabber";
  $info["protocol"] = "Jabber";

  if ($field) {
    return $info[$field];
  }
  else {
    return $info;
  }
}

function jabber_start($parser, $name, $attributes) {
  global $jabber;

  if ($attributes["ID"]) {
    $jabber["jid"] = $attributes["ID"];
  }

  if (stristr($name, "error") || ($attributes["ERROR"])) {
    $jabber["error"] = true;
  }
}

function jabber_end($parser, $name) {
}

function jabber_data($parser, $data) {
  global $jabber;

  $jabber["data"] = $data;
}

function jabber_send($session, $message) {

  // print "SEND: ". htmlentities($message) ."<br />";

  fwrite($session, $message, strlen($message));
}

function jabber_recv($session, $timout = 50) {

  /*
  ** Returns a chunk of data, read from the socket descriptor '$session'.
  ** If the call fails, or if no data is read after the specified timout,
  ** false will be returned.
  */

  while ($count < $timout) {
    $data = fread($session, 1);
    if ($data) {
      $message .= $data;
    }
    else {
      usleep(100);
      $count = $count + 1;
    }
  }

  if ($message) {
    // print "RECV: ". htmlentities($message) ."<br />";

    return $message;
  }
  else {
    return 0;
  }
}

function jabber_auth($username, $password, $server) {
  global $jabber;

  $session = fsockopen($server, 5222, $errno, $errstr, 5);

  if ($session) {

    $xml_parser = xml_parser_create();
    xml_set_element_handler($xml_parser, "jabber_start", "jabber_end");
    xml_set_character_data_handler($xml_parser, "jabber_data");

    /*
    ** Switch the given socket descriptor '$session' to non-blocking mode:
    */

    set_socket_blocking($session, false);

    /*
    ** A jabber session consists of two parallel XML streams, one from
    ** the client to the server and one from the server to the client.
    ** On connecting to a Jabber server, a Jabber client initiates the
    ** client-to-server XML stream and the server responds by initiating
    ** the server-to-client XML stream:
    */

    jabber_send($session, "<?xml version='1.0'?>");

    jabber_send($session, "<stream:stream to='$server' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams'>");

    $data = jabber_recv($session);

    if (!xml_parse($xml_parser, $data, 0)) {
      watchdog("error", "XML error: '". xml_error_string(xml_get_error_code($xml_parser)) ."' at line ". xml_get_current_line_number($xml_parser));
      return 0;
    }

    if ($jabber["error"]) {
      watchdog("error", "protocol error: ". $jabber["data"]);
      return 0;
    }

    /*
    ** Hash the password:
    */

    jabber_send($session, "<iq type='set' id='". $jabber["jid"] ."'><query xmlns='jabber:iq:auth'><username>$username</username><password>$password</password><resource>drupal</resource></query></iq>");

    $data = jabber_recv($session);

    if (!xml_parse($xml_parser, $data, 0)) {
      watchdog("error", "XML error: '". xml_error_string(xml_get_error_code($xml_parser)) ."' at line ". xml_get_current_line_number($xml_parser));
    }

    if ($jabber["error"]) {
      watchdog("error", "protocol error: ". $jabber["data"]);
      return 0;
    }

    xml_parser_free($xml_parser);

    return 1;
  }
  else {
    watchdog("error", "failed to open socket to jabber server:\n  $errno, $errstr");

    return 0;
  }
}

function jabber_page() {


  theme("header");
  theme("box", "Jabber", jabber_auth_help());
  theme("footer");
}

function jabber_auth_help() {
  $site = variable_get("site_name", "this web site");

  $output = "<p><a href=\"http://www.jabber.org/\">Jabber</a> is an <a href=\"http://www.opensource.org\">open source</a> instant messaging system designed to give the power of choice and freedom back to the users of instant messaging.  Not only does Jabber allow its users to use (and create) clients for numerous platforms, but it allows people to communicate to whomever they want in the way which is most convenient for them.</p>";
  $output .= "<p>You may login to %s using a <b>Jabber ID</b>. The format of a Jabber ID is the same as an email address: <b>name</b>@<i>server</i> An example of valid Jabber ID is <b>mwlily</b>@<i>jabber.com</i>.  Note that you must be able to access port 111 on the Jabber server from your web server. For example, sourceforge.net blocks port 111 so Jabber authentication does not work.</p>";

  return t($output, array("%s" => "<i>$site</i>"));
}

function jabber_user($type, $edit, $user) {
  $module = "jabber";
  $name = module_invoke($module, "info", "name");
  switch ($type) {
    case "view_private":
      $result = user_get_authname($user, $module);
      if ($result) {
        $output .= form_item(t("$name ID"), $result);
      }
      return $output;
    case "edit_form":
      $result = user_get_authname($user, $module);
      $output .= form_textfield(t("$name ID"), "authname_" . $module, $result, 30, 55, t("You may login to %s using a valid %id.", array("%s" => variable_get("site_name", "this web site"), "%id" => l("$name ID", "user/help#$module"))));
      return $output;
    case "edit_validate":
      return user_validate_authmap($user, $edit["authname_$module"], $module);
  }
}

?>