user.module

<?php
// $Id$

/*** Common functions ******************************************************/

// we cannot use module_invoke because we need passing by reference
function user_module_invoke($type, &$array, &$user) {
  foreach (module_list() as $module) {
    $function = $module .'_user';
    if(function_exists($function)) $function($type, $array, $user);
  }
}

function user_external_load($authname) {
  $result = db_query("SELECT uid FROM {authmap} WHERE authname = '%s'", $authname);

  if ($user = db_fetch_object($result)) {
    return user_load($user);
  }
  else {
    return 0;
  }
}

function user_load($array = array()) {
  /*
  ** Dynamically compose a SQL query:
  */

  $query = "";

  foreach ($array as $key => $value) {
    if ($key == "pass") {
      $query .= "u.$key = '". md5($value) ."' AND ";
    }
    else {
      $query .= "u.$key = '". check_query($value) ."' AND ";
    }
  }
  $result = db_query_range("SELECT u.*, r.name AS role FROM {role} r INNER JOIN {users} u ON r.rid = u.rid WHERE $query u.status < 3", 0, 1);

  $user = db_fetch_object($result);
  $user = drupal_unpack($user);


  user_module_invoke("load", $array, $user);

  return $user;
}

function user_save($account, $array = array()) {
  /*
  ** Dynamically compose a SQL query:
  */

  $user_fields = user_fields();
  if ($account->uid) {
    user_module_invoke("update", $array, $account);

    $data = unserialize(db_result(db_query("SELECT data FROM {users} WHERE uid = %d", $account->uid)));
    foreach ($array as $key => $value) {
      if ($key == "pass") {
        $query .= "$key = '%s', ";
        $v[] = md5($value);
      }
      else if (substr($key, 0, 4) !== "auth") {
        if (in_array($key, $user_fields)) {
          // escape '%'s:
          $value = str_replace("%", "%%", $value);
          $query .= "$key = '%s', ";
          $v[] = $value;
        }
        else {
          $data[$key] = $value;
        }
      }
    }
    $query .= "data = '%s', ";
    $v[] = serialize($data);

    db_query("UPDATE {users} SET $query timestamp = %d WHERE uid = %d", array_merge($v, array(time(), $account->uid)));

    $user = user_load(array("uid" => $account->uid));
  }
  else {
    $array["timestamp"] = time();
    $array["uid"] = db_next_id("{users}_uid");

    foreach ($array as $key => $value) {
      if ($key == "pass") {
        $fields[] = check_query($key);
        $values[] = md5($value);
        $s[] = "'%s'";
      }
      else if (substr($key, 0, 4) !== "auth") {
        if (in_array($key, $user_fields)) {
          $fields[] = check_query($key);
          $values[] = $value;
          $s[] = "'%s'";
        }
        else {
          $data[$key] = $value;
        }
      }
    }

    $fields[] = "data";
    $values[] = serialize($data);
    $s[] = "'%s'";

    db_query("INSERT INTO {users} (". implode(", ", $fields) .") VALUES (". implode(", ", $s) .")", $values);

    $user = user_load(array("name" => $array["name"]));

    module_invoke_all("user", "insert", $array, $user);
  }

  foreach ($array as $key => $value) {
    if (substr($key, 0, 4) == "auth") {
      $authmaps[$key] = $value;
    }
  }

  if ($authmaps) {
    user_set_authmaps($user, $authmaps);
  }

  return $user;
}

function user_validate_name($name) {
  /*
  ** Verify the syntax of the given name:
  */

  if (!$name) return t("You must enter a username.");
  if (substr($name, 0, 1) == ' ') return t("The username cannot begin with a space.");
  if (substr($name, -1) == ' ') return t("The username cannot end with a space.");
  if (ereg("  ", $name)) return t("The username cannot contain multiple spaces in a row.");
  if (ereg('[^ [:alnum:]@_.-]', $name)) return t("The username contains an illegal character.");
  if (ereg('@', $name) && !eregi('@([0-9a-z](-?[0-9a-z])*.)+[a-z]{2}([zmuvtg]|fo|me)?$', $name)) return t("The username is not a valid authentication ID.");
  if (strlen($name) > 56) return t("The username '%name' is too long: it must be less than 56 characters.", array("%name" => $name));
}

function user_validate_mail($mail) {
  if (!$mail) return t("You must enter an e-mail address.");
  if ($mail && !valid_email_address($mail)) {
    return t("The e-mail address '%mail' is not valid.", array("%mail" => $mail));
  }
}

function user_validate_authmap($account, $authname, $module) {
  $result = db_query("SELECT COUNT(*) from {authmap} WHERE uid != %d AND authname = '%s'", $account->uid, $authname);
  if (db_result($result) > 0) {
    $name = module_invoke($module, "info", "name");
    return t("The %u ID %s is already taken.", array("%u" => ucfirst($name), "%s" => "<i>$authname</i>"));
  }
}

function user_password($length = 10) {
  /*
  ** Generate a random alphanumeric password.
  */

  // This variable contains the list of allowable characters for the
  // password.  Note that the number 0 and the letter 'O' have been
  // removed to avoid confusion between the two.  The same is true
  // of 'I' and 1.
  $allowable_characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789";
  // We see how many characters are in the allowable list:
  $len = strlen($allowable_characters);

  // Seed the random number generator with the microtime stamp:
  mt_srand((double)microtime() * 1000000);

  // Declare the password as a blank string:
  $pass = "";

  // Loop the number of times specified by $length:
  for ($i = 0; $i < $length; $i++) {

    // Each iteration, pick a random character from the
    // allowable string and append it to the password:
    $pass .= $allowable_characters[mt_rand(0, $len - 1)];
  }

  return $pass;
}

function user_access($string) {
  global $user;
  static $perm = 0;

  // User #1 has all priveleges:
  if ($user->uid == 1) {
    return 1;
  }

  /*
  ** To reduce the number of SQL queries, we cache the user's permissions
  ** in a static variable.
  */

  if ($perm === 0) {
    $perm = db_result(db_query("SELECT p.perm FROM {role} r, {permission} p WHERE r.rid = p.rid AND r.rid = %d", $user->rid), 0);
  }

  return strstr($perm, $string);
}

function user_mail($mail, $subject, $message, $header) {
  if (variable_get("smtp_library", "") && file_exists(variable_get("smtp_library", ""))) {
    include_once variable_get("smtp_library", "");
    return user_mail_wrapper($mail, $subject, $message, $header);
  }
  else {
    /*
    ** Note: if you are having problems with sending mail, or mails look wrong
    ** when they are recieved you may have to modify the str_replace to suit
    ** your systems.
    **  - \r\n will work under dos and windows.
    **  - \n will work for linux, unix and BSDs.
    **  - \r will work for macs.
    **
    ** According to RFC 2646, it's quite rude to not wrap your e-mails:
    **
    ** "The Text/Plain media type is the lowest common denominator of
    ** Internet email, with lines of no more than 997 characters (by
    ** convention usually no more than 80), and where the CRLF sequence
    ** represents a line break [MIME-IMT]."
    **
    ** CRLF === \r\n
    **
    ** http://www.rfc-editor.org/rfc/rfc2646.txt
    **
    */
    return mail(
      $mail,
      user_mail_encode($subject),
      str_replace("\r", "", $message),
      "MIME-Version: 1.0\nContent-Type: text/plain; charset=UTF-8; format=flowed\nContent-transfer-encoding: 8Bit\n" . $header
    );
  }
}

function user_mail_encode($string, $charset = "UTF-8") {
  /*
  ** Used to encodes mail headers that contain non US- ASCII
  ** characters.
  ** http://www.rfc-editor.org/rfc/rfc2047.txt
  **
  ** Notes:
  **   - The chunks come in groupings of 4 bytes when using base64
  **     encoded.
  **   - trim() is used to ensure that no extra spacing is added by
  **     chunk_split() or preg_replace().
  **   - Using \n as the chunk separator may cause problems on some
  **     systems and may have to be changed to \r\n or \r.
  */
  $chunk_size = 75 - 7 - strlen($charset);
  $chunk_size -= $chunk_size % 4;
  $string = trim(chunk_split(base64_encode($string), $chunk_size, "\n"));
  $string = trim(preg_replace('/^(.*)$/m', " =?$charset?B?\\1?=", $string));
  return $string;
}

function user_deny($type, $mask) {
  $allow = db_fetch_object(db_query("SELECT * FROM {access} WHERE status = '1' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));
  $deny = db_fetch_object(db_query("SELECT * FROM {access} WHERE status = '0' AND type = '%s' AND LOWER('%s') LIKE LOWER(mask)", $type, $mask));

  return $deny && !$allow;
}

function user_fields() {
  static $fields;

  if (!$fields) {
    $result = db_query("SELECT * FROM {users} WHERE uid = 1");
    if (db_num_rows($result)) {
      $fields = array_keys(db_fetch_array($result));
    }
    else {
      // Make sure we return the default fields at least
      $fields = array("uid", "name", "pass", "mail", "mode", "sort", "threshold", "theme", "signature", "timestamp", "status", "timezone", "language", "init", "data", "rid");
    }
  }

  return $fields;
}

/*** Module hooks **********************************************************/

function user_perm() {
  return array("administer users", "access user list");
}

function user_search($keys) {
  $find = array();
  $result = db_query_range("SELECT * FROM {users} WHERE name LIKE '%%%s%%'", $keys, 0, 20);
  while ($account = db_fetch_object($result)) {
    $find[] = array("title" => $account->name, "link" => (strstr(request_uri(), "admin") ? url("admin/user/edit/$account->uid") : url("user/view/$account->uid")), "user" => $account->name);
  }
  return array(t("Matching users"), $find);
}

function user_block($op = "list", $delta = 0) {
  global $user;

  if ($op == "list") {
     $blocks[0]["info"] = t("User login");
     $blocks[1]["info"] = t("Navigation");
     $blocks[2]["info"] = t("Who's new");
     $blocks[3]["info"] = t("Who's online");

     return $blocks;
  }
  else {
    $block = array();

    switch ($delta) {
      case 0:

        if (!$user->uid) {
          /*
          ** For usability's sake, avoid showing two login forms on one
          ** page.
          */

          if (arg(0) == "user" && arg(1) != "view") {
            return;
          }

          $edit = $_POST["edit"];

          $output = "<div class=\"user-login-block\">\n";

          /*
          ** Save the referer.  We record where the user came from such
          ** that we/ can redirect him after having completed the login
          ** form.
          */

          if (empty($edit)) {
            $edit["destination"] = url($_GET["q"]);
          }
          // NOTE: special care needs to be taken because on pages with forms, such as node and comment submission pages, the $edit variable might already be set.

          $output .= form_hidden("destination", $edit["destination"]);
          $output .= form_textfield(t("Username"), "name", $edit["name"], 15, 64);
          $output .= form_password(t("Password"), "pass", $pass, 15, 64);

          if (variable_get("user_remember", 0) == 0) {
            $output .= form_checkbox(t("Remember me"), "remember_me");
          }
          elseif (variable_get("user_remember", 1) == 1) {
            $output .= form_hidden("remember_me", 1);
          }

          $output .= form_submit(t("Log in"));
          $output .= "</div>\n";

          $output  = form($output, "post", url("user/login"));

          if (variable_get("user_register", 1)) {
            $items[] = l(t("Create new account"), "user/register", array("title" => t("Create a new user account.")));
          }
          $items[] = l(t("Request new password"), "user/password", array("title" => t("Request new password via e-mail.")));

          $output .= theme("item_list", $items);

          $block["subject"] = t("User login");
          $block["content"] = $output;
        }
        return $block;
      case 1:
        if ($menu = menu_tree()) {
           $block["subject"] = $user->uid ? $user->name : t("Navigation");
           $block["content"] = "<div class=\"menu\">". $menu ."</div>";
        }
        return $block;
      case 2:
        if (user_access("access content")) {
          $result = db_query_range("SELECT uid, name FROM {users} WHERE status != '0' ORDER BY uid DESC", 0, 5);
          while ($account = db_fetch_object($result)) {
            $items[] = format_name($account);
          }

          $output = theme("user_list", $items);

          $block["subject"] = t("Who's new");
          $block["content"] = $output;
          return $block;
        }
      case 3:
        if (user_access("access content")) {
          /* count users with activity in the past defined period */
          $time_period = variable_get("user_block_seconds_online", 2700);

          /* perform database queries to gather online user lists */
          $guests = db_fetch_object(db_query("SELECT COUNT(DISTINCT sid) AS count FROM {sessions} WHERE timestamp >= %d AND uid = 0", time() - $time_period));
          $users = db_query("SELECT DISTINCT uid, MAX(timestamp) AS max_timestamp FROM {sessions} WHERE timestamp >= %d AND uid != 0 GROUP BY uid ORDER BY max_timestamp DESC", time() - $time_period );
          $total_users = db_affected_rows();

          /* format the output with proper grammar */
          if ($total_users == 1 && $guests->count == 1) {
            $output = t("There is currently %members and %visitors online.", array("%members" => format_plural($total_users, "1 user", "%count users"), "%visitors" => format_plural($guests->count, "1 guest", "%count guests")));
          }
          else {
            $output = t("There are currently %members and %visitors online.", array("%members" => format_plural($total_users, "1 user", "%count users"), "%visitors" => format_plural($guests->count, "1 guest", "%count guests")));
          }

          if (user_access("access user list") && $total_users) {

            // Display a list of currently online users
            $max_users = variable_get("user_block_max_list_count", 10);
            if ($max_users) {
              $items = array();

              while ($max_users-- && $uid = db_fetch_object($users)) {
                $items[] = format_name(user_load(array("uid" => $uid->uid)));
              }

              if ($items) {
                if (db_fetch_object($users)) {
                  $items[] = "...";
                }
                $output .= theme("item_list", $items, t("Online users:"));
              }
            }
          }
          $block["subject"] = t("Who's online");
          $block["content"] = $output;
        }
        return $block;
    }
  }
}

function theme_user_list($items, $title = NULL) {
  return theme("item_list", $items, $title);
}

function user_link($type) {
  global $user;

  if ($type == "system") {
    if ($user->uid) {
      menu("user", t("my account"), "user_page", 8);
      menu("user/edit", t("edit account"), "user_page", 0);
      menu("user/logout", t("log out"), "user_page", 10);
    }
    else {
      menu("user", t("my account"), "user_page", 8, MENU_HIDE);
    }

    if (user_access("administer users")) {
      menu("admin/user", t("accounts"), "user_admin", 2);
      menu("admin/user/create", t("new user"), "user_admin", 1);
      menu("admin/user/access", t("access rules"), "user_admin", 3);
      menu("admin/user/access/mail", t("e-mail rules"), "user_admin");
      menu("admin/user/access/user", t("name rules"), "user_admin");
      menu("admin/user/role", t("roles"), "user_admin", 4);
      menu("admin/user/permission", t("permissions"), "user_admin", 5);
      menu("admin/user/search", t("search"), "user_admin", 8);
      menu("admin/user/help", t("help"), "user_help_page", 9);
      menu("admin/user/edit", t("edit user account"), "user_admin", 0, MENU_HIDE);
    }
  }
}

/*** Authentication methods ************************************************/

function user_get_authname($account, $module) {

  /*
  **  Called by authentication modules in order to edit/view their authmap information.
  */

  $result = db_query("SELECT authname FROM {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module);
  return db_result($result);
}


function user_get_authmaps($authname = NULL) {

  /*
  ** Accepts an user object, $account, or an DA name and returns an
  ** associtive array of modules and DA names. Called at external login.
  */

  $result = db_query("SELECT authname, module FROM {authmap} WHERE authname = '%s'", $authname);
  if (db_num_rows($result) > 0) {
    while ($authmap = db_fetch_object($result)) {
      $authmaps[$authmap->module] = $authmap->authname;
    }
    return $authmaps;
  }
  else {
    return 0;
  }
}

function user_set_authmaps($account, $authmaps) {
  foreach ($authmaps as $key => $value) {
    $module = explode("_", $key, 2);
    if ($value) {
      db_query("UPDATE {authmap} SET authname = '%s' WHERE uid = %d AND module = '%s'", $value, $account->uid, $module["1"]);
      if (!db_affected_rows()) {
        db_query("INSERT INTO {authmap} (authname, uid, module) VALUES ('%s', %d, '%s')", $value, $account->uid, $module[1]);
      }
    }
    else {
      db_query("DELETE FROM {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module["1"]);
    }
  }
}

function user_auth_help_links() {
  $links = array();
  foreach (module_list() as $module) {
    if (module_hook($module, "auth")) {
      $links[] = l(module_invoke($module, "info", "name"), "user/help#$module");
    }
  }
  return $links;
}

/*** User features *********************************************************/

function user_login($edit = array(), $msg = "") {
  global $user, $base_url;

  /*
  ** If we are already logged on, go to the user page instead.
  */

  if ($user->uid) {
    drupal_goto(url("user"));
  }

  if (user_deny("user", $edit["name"])) {
    $error = t("The name '%s' has been denied access.", array("%s" => $edit["name"]));
  }
  else if ($edit["name"] && $edit["pass"]) {

    /*
    ** Try to log in the user locally:
    */

    if (!$user->uid) {
      $name = $edit["name"];
      $pass = $edit["pass"];
      $user = user_load(array("name" => $name, "pass" => $pass, "status" => 1));
    }

    /*
    ** Strip name and server from ID:
    */

    if ($server = strrchr($edit["name"], "@")) {
      $name = substr($edit["name"], 0, strlen($edit["name"]) - strlen($server));
      $server = substr($server, 1);
      $pass = $edit["pass"];
    }

    /*
    ** When possible, determine corresponding external auth source. Invoke
    ** source, and login user if successful:
    */

    if (!$user->uid && $server && $result = user_get_authmaps("$name@$server")) {
      if (module_invoke(key($result), "auth", $name, $pass, $server)) {
        $user = user_external_load("$name@$server");
        watchdog("user", "external load: $name@$server, module: ". key($result));
      }
      else {
        $error = t("Invalid password for %s.", array("%s" => "<i>$name@$server</i>"));
      }
    }

    /*
    ** Try each external authentication source in series. Register user if
    ** successful.
    */

    else if (!$user->uid && $server) {
      foreach (module_list() as $module) {
        if (module_hook($module, "auth")) {
          if (module_invoke($module, "auth", $name, $pass, $server)) {
            if (variable_get("user_register", 1) == 1 && !user_load(array("name" => "$name@$server"))) { //register this new user
              $user = user_save("", array("name" => "$name@$server", "pass" => user_password(), "init" => "$name@$server", "status" => 1, "authname_$module" => "$name@$server", "rid" => _user_authenticated_id()));
              watchdog("user", "new user: $name@$server ($module ID)", l(t("edit user"), "admin/user/edit/$user->uid"));
              break;
            }
          }
        }
      }
    }

    if ($user->uid) {
      watchdog("user", "session opened for '$user->name'");

      // update the user table timestamp noting user has logged in
      db_query("UPDATE {users} SET timestamp = '%d' WHERE uid = '%s'", time(), $user->uid);

      user_module_invoke("login", $edit, $user);

      /*
      ** If the user wants to be remembered, set the proper cookie such
      ** that the session won't expire.
      */

      $path = preg_replace("/.+\/\/[^\/]+(.*)/", "\$1/", $base_url);
      if ($edit["remember_me"]) {
        setcookie(session_name(), session_id(), time() + 3600 * 24 * 365, $path);
      }
      else {
        setcookie(session_name(), session_id(), FALSE, $path);
      }

      /*
      ** Redirect the user to the page he logged on from.
      */

      drupal_goto($edit["destination"]);
    }
    else {
      if (!$error) {
        $error = t("Sorry.  Unrecognized username or password.") ." ". l(t("Have you forgotten your password?"), "user/password");
      }
      if ($server) {
        watchdog("user", "failed login for '$name@$server': $error");
      }
      else {
        watchdog("user", "failed login for '$name': $error");
      }
    }
  }

  /*
  ** Display error message (if any):
  */

  if ($error) {
    drupal_set_message($error, 'error');
  }

  /*
  ** Save the referrer.  We record where the user came from such that we
  ** can redirect him after having completed the login form.
  */

  if (empty($edit)) {
    $edit["destination"] = url($_GET["q"]);
  }
  $output .= form_hidden("destination", $edit["destination"]);

  /*
  ** Display login form:
  */

  if ($msg) {
    $output .= "<p>$msg</p>";
  }
  if (count(user_auth_help_links()) > 0) {
    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64, t("Enter your %s username, or an ID from one of our affiliates: %a.", array("%s" => variable_get("site_name", "local"), "%a" => implode(", ", user_auth_help_links()))));
  }
  else {
    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64, t("Enter your %s username.", array("%s" => variable_get("site_name", "local"))));
  }
  $output .= form_password(t("Password"), "pass", $pass, 30, 64, t("Enter the password that accompanies your username."));
  $output .= form_checkbox(t("Remember me"), "remember_me");
  $output .= form_submit(t("Log in"));
  $items[] = l(t("Request new password"), "user/password");
  if (variable_get("user_register", 1)) {
    $items[] = l(t("Create new account"), "user/register");
  }
  $output .= theme("item_list", $items);

  $output  = form_group(t('User login'), $output);

  return form($output, "post", url("user"));
}

function _user_authenticated_id() {
  return db_result(db_query("SELECT rid FROM {role} WHERE name = 'authenticated user'"));
}

function user_logout() {
  global $user;

  if ($user->uid) {
    watchdog("user", "session closed for '$user->name'");

    /*
    ** Destroy the current session:
    */

    session_destroy();
    module_invoke_all("user", "logout", NULL, $user);
    unset($user);
  }

  drupal_goto(url());
}

function user_pass($edit = array()) {
  global $base_url;

  if ($edit["name"]) {
    $account = db_fetch_object(db_query("SELECT uid, name, mail FROM {users} WHERE status = 1 AND name = '%s'", $edit["name"]));
    if (!$account) $error = t("Sorry. The username <i>%s</i> is not recognized.", array("%s" => $edit["name"]));
  }
  else if ($edit["mail"]) {
    $account = db_fetch_object(db_query("SELECT uid, name, mail FROM {users} WHERE status = 1 AND mail = '%s'", $edit["mail"]));
    if (!$account) $error = t("Sorry. The e-mail address <i>%s</i> is not recognized.", array("%s" => $edit["mail"]));
  }
  if ($account) {

      $from = variable_get("site_mail", ini_get("sendmail_from"));
      $pass = user_password();

      /*
      ** Save new password:
      */

      user_save($account, array("pass" => $pass));

      /*
      ** Mail new password:
      */

      $variables = array("%username" => $account->name, "%site" => variable_get("site_name", "drupal"), "%password" => $pass, "%uri" => $base_url, "%uri_brief" => substr($base_url, strlen("http://")), "%mailto" => $account->mail, "%date" => format_date(time()));
      $subject = strtr(variable_get("user_mail_pass_subject", _user_mail_text("pass_subject")), $variables);
      $body = strtr(variable_get("user_mail_pass_body", _user_mail_text("pass_body")), $variables);
      $headers = "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from";
      $mail_success = user_mail($account->mail, $subject, $body, $headers);

      if ($mail_success) {
        watchdog("user", "mail password: '". $account->name ."' &lt;". $account->mail ."&gt;");
        return t("Your password and further instructions have been sent to your e-mail address.");
      }
      else {
        watchdog("error", "error mailing new password: '". $account->name ."' &lt;". $account->mail ."&gt;");
        return t("Unable to send mail. Please contact the site admin.");
      }
    }
    else {

    // Display error message if necessary.
    if ($error) {
      drupal_set_message($error, 'error');
    }

    /*
    ** Display form:
    */

    $output .= "<p>". sprintf(t("Enter your username %sor%s your e-mail address."), "<strong><i>", "</i></strong>") ."</p>";
    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64);
    $output .= form_textfield(t("E-mail address"), "mail", $edit["mail"], 30, 64);
    $output .= form_submit(t("E-mail new password"));
    $items[] = l(t("Log in"), "user/login");
    if (variable_get("user_register", 1)) {
      $items[] = l(t("Create new account"), "user/register");
    }
    $output .= theme("item_list", $items);
    $output  = form_group(t('Request new password'), $output);
    return form($output, "post", url("user"));
  }
}

function user_register($edit = array()) {
  global $user, $base_url;

  /*
  ** If we are already logged on, go to the user page instead.
  */

  if ($user->uid) {
    drupal_goto(url("user/edit"));
  }

  if (!(is_null($edit["name"]) && is_null($edit["mail"]))) {
    if ($error = user_validate_name($edit["name"])) {
      // do nothing
    }
    else if ($error = user_validate_mail($edit["mail"])) {
      // do nothing
    }
    else if (user_deny("user", $edit["name"])) {
      $error = t("The name '%s' has been denied access.", array("%s" => $edit["name"]));
    }
    else if (user_deny("mail", $edit["mail"])) {
      $error = t("The e-mail address '%s' has been denied access.", array("%s" => $edit["mail"]));
    }
    else if (db_num_rows(db_query("SELECT name FROM {users} WHERE LOWER(name) = LOWER('%s')", $edit["name"])) > 0) {
      $error = t("The name '%s' is already taken.", array("%s" => $edit["name"]));
    }
    else if (db_num_rows(db_query("SELECT mail FROM {users} WHERE LOWER(mail) = LOWER('%s') OR LOWER(init) = LOWER('%s')", $edit["mail"], $edit["mail"])) > 0) {
      $error = t("The e-mail address '%s' is already taken.", array("%s" => $edit["mail"]));
    }
    else if (variable_get("user_register", 1) == 0) {
      $error = t("Public registrations have been disabled by the site administrator.");
    }
    else {
      foreach (module_list() as $module) {
        if (module_hook($module, "user")) {
          $result = module_invoke($module, "user", "register_validate", $edit, $user);
          if (is_array($result)) {
            $data = array_merge($data, $result);
          }
          elseif (is_string($result)) {
            $error = $result;
            break;
          }
        }
      }
      if (!$error) {
        $success = 1;
      }
    }
  }

  if ($success) {

    $from = variable_get("site_mail", ini_get("sendmail_from"));
    $pass = user_password();

    // TODO: is this necessary? Won't session_write replicate this?
    unset($edit["session"]);
    $account = user_save("", array_merge(array("name" => $edit["name"], "pass" => $pass, "init" => $edit["mail"], "mail" => $edit["mail"], "rid" => _user_authenticated_id(), "status" => (variable_get("user_register", 1) == 1 ? 1 : 0)), $data));
    watchdog("user", "new user: '". $edit["name"] ."' &lt;". $edit["mail"] ."&gt;", l(t("edit user"), "admin/user/edit/$account->uid"));

    $variables = array("%username" => $edit["name"], "%site" => variable_get("site_name", "drupal"), "%password" => $pass, "%uri" => $base_url, "%uri_brief" => substr($base_url, strlen("http://")), "%mailto" => $edit["mail"], "%date" => format_date(time()));

    //the first user may login immediately, and receives a customized welcome e-mail.
    if ($account->uid == 1) {
      user_mail($edit["mail"], t("drupal user account details for %s", array("%s" => $edit["name"])), strtr(t("%username,\n\nYou may now login to %uri using the following username and password:\n\n  username: %username\n  password: %password\n\n". url("user/edit") ."\n\n--drupal"), $variables), "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
      // This should not be t()'ed. No point as its only shown once in the sites lifetime, and it would be bad to store the password
      $output .= "<p>Welcome to Drupal. You are user #1, which gives you full and immediate access.  All future registrants will receive their passwords via e-mail, so please configure your e-mail settings using the Administration pages.</p><p> Your password is <strong>$pass</strong>. You may change your password on the next page.</p><p>Please login below.</p>";
      $output .= form_hidden("destination", url("user/edit"));
      $output .= form_hidden("name", $account->name);
      $output .= form_hidden("pass", $pass);
      $output .= form_submit(t("Log in"));
      return form($output);
    }
    else {
      if ($account->status) {
        /*
        ** Create new user account, no administrator approval required:
        */

        $subject = strtr(variable_get("user_mail_welcome_subject", _user_mail_text("welcome_subject")), $variables);
        $body = strtr(variable_get("user_mail_welcome_body", _user_mail_text("welcome_body")), $variables);
        user_mail($edit["mail"], $subject, $body, "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
        return t("Your password and further instructions have been sent to your e-mail address.");
      }
      else {
        /*
        ** Create new user account, administrator approval required:
        */
        $subject = strtr(variable_get("user_mail_approval_subject", _user_mail_text("welcome_approval_subject")), $variables);
        $body = strtr(variable_get("user_mail_approval_body", _user_mail_text("welcome_approval_body")), $variables);
        user_mail($edit["mail"], $subject, $body, "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
        user_mail(variable_get("site_mail", ini_get("sendmail_from")), $subject, t("%u has applied for an account.\n\n%uri", array("%u" => $account->name, "%uri" => url("admin/user/edit/$account->uid"))), "From: $from\nReply-to: $from\nX-Mailer: Drupal\nReturn-path: $from\nErrors-to: $from");
        return t("Thank you for applying for an account. Your account is currently pending approval by the site administrator.<br />In the meantime, your password and further instructions have been sent to your e-mail address.");
      }
    }
  }
  else {
    if ($error) {
      drupal_set_message($error, 'error');
    }
  }

  // display the registration form
  $output .= variable_get("user_registration_help", "");
  $affiliates = user_auth_help_links();
  if (count($affiliates) > 0) {
    $affiliates = implode(", ", $affiliates);
    $output .= "<p>". t("Note: If you have an account with one of our affiliates (%s), you may ". l("login now", "user/login") ." instead of registering.", array("%s" => $affiliates)) ."</p>";
  }
  $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 64, t("Your full name or your preferred username: only letters, numbers and spaces are allowed."));
  $output .= form_textfield(t("E-mail address"), "mail", $edit["mail"], 30, 64, t("A password and instructions will be sent to this e-mail address, so make sure it is accurate."));
  foreach (module_list() as $module) {
    if (module_hook($module, "user")) {
      $output .= module_invoke($module, "user", "register_form", $edit, $user);
    }
  }
  $output .= form_submit(t("Create new account"));
  $items[] = l(t("Request new password"), "user/password");
  $items[] = l(t("Log in"), "user/login");
  $output .= theme("item_list", $items);
  $output  = form_group(t('Create new user account'), $output);

  return form($output);
}

function user_edit($edit = array()) {