user.module

<?php
// $Id$

session_set_save_handler("sess_open", "sess_close", "sess_read", "sess_write", "sess_destroy", "sess_gc");
session_start();

function user_system($field){
  $system["description"] = t("Enables the user registration and login system.");
  $system["admin_help"] = t("In order to use the full power of Drupal a visitor must sign up for an account. This page lets you setup how a user signs up, logs out, the guidelines from the system about user subscriptions, and the e-mails the system will send to the user.");
  return $system[$field];
}

/*** Session functions *****************************************************/

function sess_open($save_path, $session_name) {
  return 1;
}

function sess_close() {
  return 1;
}

function sess_read($key) {
  global $user;
  $user = user_load(array("sid" => $key, "status" => 1));

  return !empty($user->session) ? $user->session : '';
}

function sess_write($key, $value) {

  db_query("UPDATE {users} SET hostname = '%s', session = '%s', timestamp = %d WHERE sid = '$key'", $_SERVER["REMOTE_ADDR"], $value, time());

  return '';
}

function sess_destroy($key) {

  db_query("UPDATE {users} SET hostname = '%s', timestamp = %d, sid = '' WHERE sid = '$key'", $_SERVER["REMOTE_ADDR"], time());
}

function sess_gc($lifetime) {
  return 1;
}

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

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

  if (db_fetch_object($arr_uid)) {
    $uid = db_result($arr_uid);
    return user_load(array("uid" => $uid));
  }
  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);
  if ($user->data && $data = unserialize($user->data)) {
    foreach ($data as $key => $value) {
      if (!isset($user->$key)) {
        $user->$key = $value;
      }
    }
  }

  return $user;
}

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

  $user_fields = user_fields();
  if ($account->uid) {
    $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();

    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"]));
  }

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

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

  return $user;
}

function user_set($account, $key, $value) {
  $account->data[$key] = $value;
  return $account;
}

function user_get($account, $key) {
  return $account->data[$key];
}

function user_validate_name($name) {

  /*
  ** Verify the syntax of the given name:
  */

  if (!$name) return t("You must enter a username.");
  if (ereg("^ ", $name)) return t("The username cannot begin with a space.");
  if (ereg(" \$", $name)) 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("[^ a-zA-Z0-9@_\.\-]", $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 ($mail && !valid_email_address($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;

  if ($user->uid == 1) {
    return 1;
  }

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

  if (!$perm) {
    if ($user->uid) {
      $perm = db_result(db_query("SELECT p.perm FROM {role} r, {permission} p WHERE r.rid = p.rid AND name = '%s'", $user->role), 0);
    }
    else {
      $perm = db_result(db_query("SELECT p.perm FROM {role} r, {permission} p WHERE r.rid = p.rid AND name = 'anonymous user'"), 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, $subject, str_replace("\r", "", $message), $header);
  }
}

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));

  if ($deny && !$allow) {
    return 1;
  }
  else {
    return 0;
  }
}

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));
    }
  }

  // Make sure we return the default fields at least
  return is_array($fields) ? $fields: array("uid", "name", "pass", "mail", "homepage", "mode", "sort", "threshold", "theme", "signature", "timestamp", "hostname", "status", "timezone", "rating", "language", "sid", "init", "session", "data", "rid");
}

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

function user_perm() {
  return array("administer users");
}

function user_search($keys) {

  $result = db_query_range("SELECT * FROM {users} WHERE name LIKE '%$keys%'", 0, 20);
  while ($account = db_fetch_object($result)) {
    $find[$i++] = array("title" => $account->name, "link" => (strstr(request_uri(), "admin") ? url("admin/user/edit/$account->uid") : url("user/view/$account->uid")), "user" => $account->name);
  }
  return $find;
}

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

  $edit = $_POST["edit"];

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

     return $blocks;
  }
  else {
    switch ($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;
          }

          $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.

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

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

          $form .= form_submit(t("Log in"));

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

          $output .= "</div>\n";

          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("theme_item_list", $items);

          $block["subject"] = t("User login");
          $block["content"] = "<div class=\"user-login-link\">$output</div>";
          return $block;
        }
        break;
      case 1:
        if ($user->uid) {
          $output = "<div class=\"user-information-block\">\n";
          $output .= theme("theme_menu_list", module_invoke_all("link", "menu.create"));
          $output .= theme("theme_menu_list", module_invoke_all("link", "menu.view"));
          $output .= theme("theme_menu_list", module_invoke_all("link", "menu.settings"));
          $output .= theme("theme_menu_list", module_invoke_all("link", "menu.misc"));
          $output .= "</div>\n";

          $block["subject"] = $user->name;
          $block["content"] = "<div class=\"user-login-link\">$output</div>";
          return $block;
        }
        break;
      case 2:
        $result = db_query_range("SELECT uid, name FROM {users} WHERE status != '0' ORDER BY uid DESC", 0, 5);
        while ($account = db_fetch_object($result)) {
          $items[] = l((strlen($account->name) > 15 ? substr($account->name, 0, 15) . '...' : $account->name), "user/view/$account->uid");
        }

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

        $block["subject"] = t("Who's new");
        $block["content"] = $output;
        return $block;
    }
  }
}

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

function theme_menu_list($items, $title = NULL) {
  return theme("theme_item_list",$items, $title);
}

function user_link($type) {

  $links = array();

  if ($type == "page") {
    $links[] = l(t("user account"), "user", array("title" => t("Create a user account, request a new password or edit your account settings.")));
  }

  if ($type == "menu.settings") {
    $links[] = l(t("edit account"), "user/edit", array("title" => t("View and edit your account information.")));
  }

  if ($type == "menu.misc") {
    if (user_access("access administration pages")) {
      $links[] = l(t("administer %a", array("%a" => variable_get("site_name", "drupal"))), "admin", array("title" => t("Access administration pages.")));
    }

    $links[] = l(t("logout"), "user/logout", array("title" => t("Logout.")));
  }

  if ($type == "admin" && user_access("administer users")) {
    $help["user"] = t("Drupal allows users to register, login, logout, maintain user profiles, etc.  No participant can use his own name to post content until he signs up for a user account.<br />Click on either the \"username\" or \"edit account\" to edit a user's information.");
    $help["create"] = t("This web page allows the administrators to register a new users by hand.<br />Note:<ul><li>You cannot have a user where either the E-Mail address or the username match another user in the system</li></ul>");
    $help["view"] = t("This page allows you to review and edit any user's profile. To edit a profile click on either the \"username\" or \"edit account\".");
    $help["view-active"] = t("This page allows you to review and edit an active user's profile. To edit a profile click on either the \"username\" or \"edit account\".");
    $help["view-new"] = t("This page allows you to review and edit a new user's profile. To edit a profile click on either the \"username\" or \"edit account\".");
    $help["view-block"] = t("This page allows you to review and edit a blocked user's profile. To edit a profile click on either the \"username\" or \"edit account\".");
    $help["view-role"] = "This page allows you to review and edit a user with role '%role's profile. To edit a profile click on either the \"username\" or \"edit account\".";
    $help["access-overview"] = t("Access rules allow Drupal administrators to choose usernames and E-Mail address that are prevented from using drupal. To enter the mask for E-Mail addresses click on <a href=\"%e-mail\">e-mail rules</a>, for the username mask click on <a href=\"%username\">username rules</a>", array("%e-mail" => url("admin/user/access/mail"), "%username" => url("admin/user/access/user")));
    $help["access-email"] = t("Setup and test the E-Mail access rules. The access function checks if you match a deny and <b>not</b> an allow. If you match <b>only</b> a deny then it is denied. Any other case, such as both a deny and an allow pattern matching, allows the pattern.<br />Notes: <ul><li>To delete a rule click on \"delete rule\".</li><li>The order of the rules does <b>not</b> matter.</li></ul>");
    $help["access-name"] = t("Setup and test the Username access rules. The access function checks if you match a deny and <b>not</b> an allow. If you do then it is denied. Any other case, such as a deny pattern and an allow pattern, allows the pattern.<br />Notes: <ul><li>To delete a rule click on \"delete rule\".</li><li>The order of the rules does <b>not</b> matter.</li></ul>");
    $help["permission"] = t("In this area you will define the <b>permissions</b> for each user role (Role names are defined in <a href=\"%role\">user roles</a>). Each permission describes a fine-grained logical operation, such as being able to access the administration pages, or adding/modifying a user account. You could say a permission represents access granted to a user to perform a set of operations.", array("%role" => url("admin/user/role")));
    $help["role"] = t("Roles allow you to fine tune the security and administration of drupal.  A role defines a group of users that have certain privileges as defined in <a href=\"%permission\">user permissions</a>.  Examples of roles include: anonymous user, authenticated user, moderator, administrator and so on. In this area you will define the <b>names</b> of the various roles. To delete a role choose \"edit role\"<br />By default, Drupal comes with two user roles: <ul><li>Anonymous user: this role is used for users that don't have a user account or that are not authenticated.</li><li>Authenticated user: this role is assigned automatically to authenticated users.  Most registered users will belong to this user role unless specified otherwise.</li></ul>", array("%permission" => url("admin/user/permission")));
    $help["search"] = t("Enter a simple pattern ( '*' may be user as a wildcard match) to search for a username.  For example, one may search for 'br' and Drupal might return 'brian', 'brad', and 'brenda'.");

    menu("admin/user", "user management", "user_admin", $help["user"], 2);
    menu("admin/user/create", "create new account", "user_admin", $help["create"], 1);
    menu("admin/user/account", "view user accounts", "user_admin", $help["view"], 2);
    menu("admin/user/access", "access rules", NULL, $help["access-overview"], 3);
    menu("admin/user/access/mail", "e-mail rules", "user_admin", $help["access-email"]);
    menu("admin/user/access/user", "username rules", "user_admin", $help["access-name"]);
    menu("admin/user/role", "user roles", "user_admin", $help["role"], 4);
    menu("admin/user/permission", "user permissions", "user_admin", $help["permission"], 5);
    menu("admin/user/search", "search accounts", "user_admin", $help["search"], 8);
    menu("admin/user/help", "help", "user_help", NULL, 9);
    menu("admin/user/edit", "edit user account", "user_admin", NULL, 0, 1); // hidden menu
    menu("admin/user/account/0", "active users", "user_admin", $help["view-active"], 1);
    menu("admin/user/account/1", "new users", "user_admin", $help["view-new"], 2);
    menu("admin/user/account/2", "blocked users", "user_admin", $help["view-block"], 3);

    $i = 3;
    foreach (user_roles(1) as $key => $value) {
      $help_msg = t($help["view-role"], array("%role" => $value));
      menu("admin/user/account/". $i++, "users with role '$value'", "user_admin", $help_msg, 4);
    }
  }

  return $links;
}

/*** 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) {
      $result = db_query("SELECT COUNT(*) from {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module["1"]);
      if (db_result($result) == 0) {
        $result = db_query("INSERT INTO {authmap} (authname, uid, module) VALUES ('%s', %d, '%s')", $value, $account->uid, $module[1]);
      }
      else {
        $result = db_query("UPDATE {authmap} SET authname = '%s' WHERE uid = %d AND module = '%s'", $value, $account->uid, $module["1"]);
      }
    }
    else {
      $result = db_query("DELETE FROM {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module["1"]);
    }
  }
  return $result;
}

function user_auth_help_links() {
  $links = array();
  foreach (module_list() as $module) {
    if (module_hook($module, "auth_help")) {
      $links[] = l(module_invoke($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) {
      $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 corrosponding external auth source. Invoke source, and login user if successful:
    */

    if (!$user && $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 && $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 ($module ID)", l("edit user", "admin/user/edit/$user->uid"));
              break;
            }
          }
        }
      }
    }

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

      /*
      ** Write session ID to database:
      */

      user_save($user, array("sid" => session_id()));

      /*
      ** 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) {
    $output .= theme("theme_error", $error);
  }

  /*
  ** 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"]);
  }
  $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", 1, 0, 0);
  $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("theme_item_list", $items);

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

    /*
    ** Destroy the current session:
    */

    session_destroy();
    unset($user);
  }

  /*
  ** Redirect the user to his personal information page:
  */

  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 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 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) {
      $output .= theme("theme_error", $error);
    }

    /*
    ** Display form:
    */

    $output .= "<p>". sprintf(t("Enter your username %sor%s your e-mail address."), "<b><i>", "</i></b>") ."</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("theme_item_list", $items);

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

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

  $edit = $_POST["edit"];
  /*
  ** If we are already logged on, go to the user page instead.
  */

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

  if ($edit["name"] && $edit["mail"]) {
    if ($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();

    // create new user account, noting whether administrator approval is required
    user_role_init();
    // 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(), "rating" => 0, "status" => (variable_get("user_register", 1) == 1 ? 1 : 0)), $data));
    watchdog("user", "new user: '". $edit["name"] ."' &lt;". $edit["mail"] ."&gt;", l("edit user", "admin/user/edit/$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
      $output .= "<p>Welcome to Drupal. You are user #1, which gives you full and immediate access.  All future registrants will receive their passwords via e-mail, so please configure your e-mail settings using the Administration pages.</p><p> Your password is <b>$pass</b>. 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) {
      $output .= theme("theme_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("theme_item_list", $items);

  return form($output);
}


function user_delete() {
  global $user;

  $edit = $_POST["edit"];

  if ($edit["confirm"]) {
    watchdog("user","$user->name deactivated her own account.");
    db_query("UPDATE {users} SET mail = 'deleted', status = '0' WHERE uid = %d", $user->uid);
    $output .= t("Your account has been deactivated.");
  }
  else {
    $output .= form_item(t("Confirm Deletion"), t("You are about to deactivate your own user account. In addition, your e-mail address will be removed from the database."));
    $output .= form_hidden("confirm", 1);
    $output .= form_submit(t("Delete account"));
    $output = form($output);
  }
  return $output;
}

function user_edit($edit = array()) {
  global $user, $languages;

  if ($user->uid) {
    if ($edit["name"]) {
      if ($error = user_validate_name($edit["name"])) {
        // do nothing
      }
      else if ($error = user_validate_mail($edit["mail"])) {
        // do nothing
      }
      else if (db_num_rows(db_query("SELECT uid FROM {users} WHERE uid != '$user->uid' AND LOWER(name) = LOWER('%s')", $edit["name"])) > 0) {
        $error = t("The name '%s' is already taken.", array("%s" => $edit["name"]));
      }
      else if ($edit["mail"] && db_num_rows(db_query("SELECT uid FROM {users} WHERE uid != '$user->uid' AND LOWER(mail) = LOWER('%s')", $edit["mail"])) > 0) {
        $error = t("The e-mail address '%s' is already taken.", array("%s" => $edit["mail"]));
      }
      else if ($user->uid) {
        /*
        ** If required, check that proposed passwords match.  If so,
        ** add new password to $edit.
        */

        if ($edit["pass1"]) {
          if ($edit["pass1"] == $edit["pass2"]) {
            $edit["pass"] = $edit["pass1"];
          }
          else {
            $error = t("The specified passwords do not match.");
          }
        }
        unset($edit["pass1"], $edit["pass2"]);

        /*
        ** Validate input fields to make sure users don't submit
        ** invalid form data.
        */

        if (!user_access("administer users")) {
           if (array_intersect(array_keys($edit), array("rid", "init", "rating", "session"))) {
             watchdog("warning", "detected malicious attempt to alter a protected database field");
           }

           $edit["rid"] = $user->rid;
           $edit["init"] = $user->init;
           $edit["rating"] = $user->rating;
           $edit["session"] = $user->session;
        }

        /*
        ** Have the modules that extend the user information validate
        ** their data.
        */

        foreach (module_list() as $module) {
          if (module_hook($module, "user")) {
            $result = module_invoke($module, "user", "edit_validate", $edit, $user);
          }
          if (is_array($result)) {
            $data = array_merge($data, $result);
          }
          elseif (is_string($result)) {
            $error = $result;
            break;
          }
        }

        if (!$error) {
          /*
          ** Save user information:
          */

          $user = user_save($user, array_merge($edit, $data));

          $output .= t("Your user information changes have been saved.");
        }
      }
    }

    if ($error) {
      $output .= theme("theme_error", $error);
    }

    if (!$edit) {
      $edit = object2array($user);
    }

    $output .= form_textfield(t("Username"), "name", $edit["name"], 30, 55, 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, 55, t("Insert a valid e-mail address.  All e-mails from the system will be sent to this address. The e-mail address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by e-mail."));

    foreach (module_list() as $module) {
      if (module_hook($module, "user")) {
        $output .= module_invoke($module, "user", "edit_form", $edit, $user);
      }
    }

    $options = "<option value=\"\"". (("" == $key) ? " selected=\"selected\"" : "") .">". t("Default theme") ."</option>\n";