user.module 78.1 KB
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<?php
// $Id$

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/**
 * @file
 * Enables the user registration and login system.
 */

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/**
 * Invokes hook_user() in every module.
 *
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 * We cannot use module_invoke() for this, because the arguments need to
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 * be passed by reference.
 */
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function user_module_invoke($type, &$array, &$user, $category = NULL) {
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  foreach (module_list() as $module) {
    $function = $module .'_user';
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    if (function_exists($function)) {
      $function($type, $array, $user, $category);
    }
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  }
}

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function user_external_load($authname) {
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  $result = db_query("SELECT uid FROM {authmap} WHERE authname = '%s'", $authname);
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  if ($user = db_fetch_object($result)) {
    return user_load($user);
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  }
  else {
    return 0;
  }
}

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/**
 * Fetch a user object.
 *
 * @param $array
 *   An associative array of attributes to search for in selecting the
 *   user, such as user name or email address.
 *
 * @return
 *   A fully-loaded $user object.
 */
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function user_load($array = array()) {
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  // Dynamically compose a SQL query:
  $query = '';
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  $params = array();
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  foreach ($array as $key => $value) {
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    if ($key == 'pass') {
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      $query .= "u.$key = '%s' AND ";
      $params[] = md5($value);
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    }
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    else if ($key == 'uid') {
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      $query .= "u.uid = %d AND ";
      $params[] = $value;
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    }
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    else {
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      $query .= "LOWER(u.$key) = '%s' AND ";
      $params[] = strtolower($value);
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    }
  }
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  array_unshift($params, "SELECT u.* FROM {users} u WHERE $query u.status < 3");
  $params[] = 0;
  $params[] = 1;
  $result = call_user_func_array('db_query_range', $params);
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  if (db_num_rows($result)) {
    $user = db_fetch_object($result);
    $user = drupal_unpack($user);
    user_module_invoke('load', $array, $user);
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    $user->roles = array();
    $result = db_query('SELECT r.rid, r.name FROM {role} r INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid = %d', $user->uid);
    while ($role = db_fetch_object($result)) {
      $user->roles[$role->rid] = $role->name;
    }
  }
  else {
    $user = new StdClass();
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  }
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  return $user;
}

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/**
 * Save changes to a user account.
 *
 * @param $account
 *   The $user object for the user to modify.
 *
 * @param $array
 *   An array of fields and values to save. For example array('name' => 'My name');
 *
 * @param $category
 *   (optional) The category for storing profile information in.
 */
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function user_save($account, $array = array(), $category = 'account') {
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  // Dynamically compose a SQL query:
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  $user_fields = user_fields();
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  if ($account->uid) {
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    user_module_invoke('update', $array, $account, $category);
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    $data = unserialize(db_result(db_query('SELECT data FROM {users} WHERE uid = %d', $account->uid)));
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    foreach ($array as $key => $value) {
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      if ($key == 'pass') {
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        $query .= "$key = '%s', ";
        $v[] = md5($value);
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      }
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      else if (substr($key, 0, 4) !== 'auth') {
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        if (in_array($key, $user_fields)) {
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          // Save standard fields
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          $query .= "$key = '%s', ";
          $v[] = $value;
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        }
        else {
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          if ($value === null) {
            // Setting a field to null deletes it from the data column.
            unset($data[$key]);
          }
          else {
            $data[$key] = $value;
          }
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        }
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      }
    }
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    $query .= "data = '%s', ";
    $v[] = serialize($data);
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    db_query("UPDATE {users} SET $query changed = %d WHERE uid = %d", array_merge($v, array(time(), $account->uid)));
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    // Reload user roles if provided
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    if (is_array($array['roles'])) {
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      db_query('DELETE FROM {users_roles} WHERE uid = %d', $account->uid);
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      foreach (array_keys($array['roles']) as $rid) {
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        db_query('INSERT INTO {users_roles} (uid, rid) VALUES (%d, %d)', $account->uid, $rid);
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      }
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    }

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    // Refresh user object
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    $user = user_load(array('uid' => $account->uid));
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  }
  else {
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    $array['created'] = time();
    $array['changed'] = time();
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    $array['uid'] = db_next_id('{users}_uid');
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    // Note, we wait with saving the data column to prevent module-handled
    // fields from being saved there. We cannot invoke hook_user('insert') here
    // because we don't have a fully initialized user object yet.
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    foreach ($array as $key => $value) {
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      if ($key == 'pass') {
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        $fields[] = check_query($key);
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        $values[] = md5($value);
        $s[] = "'%s'";
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      }
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      else if (substr($key, 0, 4) !== 'auth') {
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        if (in_array($key, $user_fields)) {
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          $fields[] = check_query($key);
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          $values[] = $value;
          $s[] = "'%s'";
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        }
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      }
    }
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    db_query('INSERT INTO {users} ('. implode(', ', $fields) .') VALUES ('. implode(', ', $s) .')', $values);
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    // Reload user roles (delete just to be safe).
    db_query('DELETE FROM {users_roles} WHERE uid = %d', $array['uid']);
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    foreach ($array['roles'] as $rid) {
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      db_query('INSERT INTO {users_roles} (uid, rid) VALUES (%d, %d)', $array['uid'], $rid);
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    }

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    // Build the initial user object.
    $user = user_load(array('uid' => $array['uid']));
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    user_module_invoke('insert', $array, $user, $category);

    // Build and save the serialized data field now
    $data = array();
    foreach ($array as $key => $value) {
      if ((substr($key, 0, 4) !== 'auth') && (!in_array($key, $user_fields)) && ($value !== null)) {
        $data[$key] = $value;
      }
    }
    db_query("UPDATE {users} SET data = '%s' WHERE uid = %d", serialize($data), $user->uid);

    // Build the finished user object.
    $user = user_load(array('uid' => $array['uid']));
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  }

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  // Save distributed authentication mappings
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  foreach ($array as $key => $value) {
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    if (substr($key, 0, 4) == 'auth') {
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      $authmaps[$key] = $value;
    }
  }
  if ($authmaps) {
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    user_set_authmaps($user, $authmaps);
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  }

  return $user;
}

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/**
 * Verify the syntax of the given name.
 */
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function user_validate_name($name) {
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  if (!$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.');
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  if (ereg("[^\x80-\xF7 [:alnum:]@_.-]", $name)) return t('The username contains an illegal character.');
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  if (ereg('@', $name) && !eregi('@([0-9a-z](-?[0-9a-z])*.)+[a-z]{2}([zmuvtg]|fo|me)?$', $name)) return t('The username is not a valid authentication ID.');
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  if (strlen($name) > 56) return t('The username %name is too long: it must be less than 56 characters.', array('%name' => "<em>$name</em>"));
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}

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

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function user_validate_picture($file, &$edit, $user) {
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  // Initialize the picture:
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  $edit['picture'] = $user->picture;

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  // Check that uploaded file is an image, with a maximum file size
  // and maximum height/width.
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  $extension = strtolower(strrchr($file->filename, '.'));
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  $size = @getimagesize($file->filepath);
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  list($maxwidth, $maxheight) = explode('x', variable_get('user_picture_dimensions', '85x85'));
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  if ((!in_array($size[2], array(1, 2, 3))) || (!in_array($extension, array('.gif', '.jpg', '.png', '.jpeg')))) {
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    form_set_error('picture', t('The uploaded file was not an image.'));
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  }
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  else if ($file->size > (variable_get('user_picture_file_size', '30') * 1000)) {
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    form_set_error('picture', t('The uploaded image is too large; the maximum file size is %size kB.', array('%size' => variable_get('user_picture_file_size', '30'))));
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  }
  else if ($size[0] > $maxwidth || $size[1] > $maxheight) {
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    form_set_error('picture', t('The uploaded image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => variable_get('user_picture_dimensions', '85x85'))));
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  }
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  else if ($file = file_save_upload('picture', variable_get('user_picture_path', 'pictures') .'/picture-'. $user->uid . $extension, 1)) {
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    $edit['picture'] = $file->filepath;
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  }
  else {
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    form_set_error('picture', t("Failed to upload the picture image; the %directory directory doesn't exist.", array('%directory' => '<em>'. variable_get('user_picture_path', 'pictures') .'</em>')));
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  }
}

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

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/**
 * Generate a random alphanumeric password.
 */
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function user_password($length = 10) {
  // 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.
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  $allowable_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789';

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  // We see how many characters are in the allowable list:
  $len = strlen($allowable_characters);

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  // Seed the random number generator with the microtime stamp.
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  mt_srand((double)microtime() * 1000000);
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  // Declare the password as a blank string.
  $pass = '';
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  // Loop the number of times specified by $length.
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  for ($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;
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}

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/**
 * Determine whether the user has a given privilege.
 *
 * @param $string
 *   The permission, such as "administer nodes", being checked for.
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 * @param $account
 *   (optional) The account to check, if not given use currently logged in user.
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 *
 * @return
 *   TRUE iff the current user has the requested permission.
 *
 * All permission checks in Drupal should go through this function. This
 * way, we guarantee consistent behavior, and ensure that the superuser
 * can perform all actions.
 */
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function user_access($string, $account = NULL) {
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  global $user;
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  static $perm = array();
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  // User #1 has all privileges:
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  if ($user->uid == 1) {
    return 1;
  }

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  if (is_null($account)) {
    $account = $user;
  }

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  // To reduce the number of SQL queries, we cache the user's permissions
  // in a static variable.
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  if (!isset($perm[$account->uid])) {
    $result = db_query('SELECT DISTINCT(p.perm) FROM {role} r INNER JOIN {permission} p ON p.rid = r.rid INNER JOIN {users_roles} ur ON ur.rid = r.rid WHERE ur.uid = %d', $account->uid);
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    while ($row = db_fetch_object($result)) {
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      $perm[$account->uid] .= "$row->perm, ";
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    }
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  }

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  return strstr($perm[$account->uid], "$string, ");
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}

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/**
 * Send an e-mail message.
 */
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function user_mail($mail, $subject, $message, $header) {
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  if (variable_get('smtp_library', '') && file_exists(variable_get('smtp_library', ''))) {
    include_once variable_get('smtp_library', '');
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    return user_mail_wrapper($mail, $subject, $message, $header);
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  }
  else {
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    /*
    ** Note: if you are having problems with sending mail, or mails look wrong
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    ** when they are received you may have to modify the str_replace to suit
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    ** your systems.
    **  - \r\n will work under dos and windows.
    **  - \n will work for linux, unix and BSDs.
    **  - \r will work for macs.
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    **
    ** 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
    **
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    */
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    return mail(
      $mail,
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      mime_header_encode($subject),
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      str_replace("\r", '', $message),
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      "MIME-Version: 1.0\nContent-Type: text/plain; charset=UTF-8; format=flowed\nContent-transfer-encoding: 8Bit\n" . $header
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    );
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  }
}

function user_deny($type, $mask) {
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  $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));
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  return $deny && !$allow;
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}

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

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/**
 * Implementation of hook_perm().
 */
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function user_perm() {
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  return array('administer users');
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}

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/**
 * Implementation of hook_file_download().
 *
 * Ensure that user pictures (avatars) are always downloadable.
 */
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function user_file_download($file) {
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  if (strpos($file, variable_get('user_picture_path', 'pictures') .'/picture-') === 0) {
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    list($width, $height, $type, $attr) = @getimagesize(file_create_path($file));
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    $types = array(
      IMAGETYPE_GIF => 'image/gif',
      IMAGETYPE_JPEG => 'image/jpeg',
      IMAGETYPE_PNG => 'image/png',
      IMAGETYPE_SWF => 'application/x-shockwave-flash',
      IMAGETYPE_PSD => 'image/psd',
      IMAGETYPE_BMP => 'image/bmp',
      IMAGETYPE_TIFF_II => 'image/tiff',
      IMAGETYPE_TIFF_MM  => 'image/tiff',
      IMAGETYPE_JPC => 'application/octet-stream',
      IMAGETYPE_JP2 => 'image/jp2',
      IMAGETYPE_JPX => 'application/octet-stream',
      IMAGETYPE_JB2 => 'application/octet-stream',
      IMAGETYPE_SWC => 'application/x-shockwave-flash',
      IMAGETYPE_IFF => 'image/iff',
      IMAGETYPE_WBMP => 'image/vnd.wap.wbmp',
      IMAGETYPE_XBM => 'image/xbm'
    );
    return array('Content-type: '. $types[$type]);
  }
}

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/**
 * Implementation of hook_search().
 */
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function user_search($op = 'search', $keys = null) {
  switch ($op) {
    case 'name':
      return t('users');
    case 'search':
      $find = array();
      // Replace wildcards with MySQL/PostgreSQL wildcards.
      $keys = str_replace('*', '%', $keys);
      $result = db_query_range("SELECT * FROM {users} WHERE LOWER(name) LIKE '%%%s%%'", strtolower($keys), 0, 20);
      while ($account = db_fetch_object($result)) {
        $find[] = array('title' => $account->name, 'link' => url("user/$account->uid/view"));
      }
      return $find;
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  }
}

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/**
 * Implementation of hook_user().
 */
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function user_user($type, &$edit, &$user, $category = NULL) {
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  if ($type == 'view') {
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    return array(t('History') => form_item(t('Member for'), format_interval(time() - $user->created)));
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  }
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  if ($type == 'form' && $category == 'account') {
    return user_edit_form(arg(1), $edit);
  }

  if ($type == 'validate' && $category == 'account') {
    return user_edit_validate(arg(1), $edit);
  }

  if ($type == 'categories') {
    return array(array('name' => 'account', 'title' => t('account settings'), 'weight' => 1));
  }
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}

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/**
 * Implementation of hook_block().
 */
function user_block($op = 'list', $delta = 0) {
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  global $user;

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

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    switch ($delta) {
      case 0:
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        if (!$user->uid) {
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          // For usability's sake, avoid showing two login forms on one page.
          if (arg(0) == 'user' && arg(1) != 'view') {
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            return;
          }

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          $edit = $_POST['edit'];
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          $output = "<div class=\"user-login-block\">\n";

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          // Save the referer.  We record where the user came from such
          // that we can redirect him after having completed the login form.
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          if (empty($edit)) {
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            $edit['destination'] = $_GET['q'];
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          }
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          // 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);
          $output .= form_submit(t('Log in'));
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          $output .= "</div>\n";
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          $output  = form($output, 'post', url('user/login'));
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          if (variable_get('user_register', 1)) {
            $items[] = l(t('Create new account'), 'user/register', array('title' => t('Create a new user account.')));
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          }
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          $items[] = l(t('Request new password'), 'user/password', array('title' => t('Request new password via e-mail.')));
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          $output .= theme('item_list', $items);
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          $block['subject'] = t('User login');
          $block['content'] = $output;
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        }
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        return $block;
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      case 1:
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        if ($menu = theme('menu_tree')) {
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           $block['subject'] = $user->uid ? $user->name : t('Navigation');
           $block['content'] = '<div class="menu">'. $menu .'</div>';
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        }
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        return $block;
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      case 2:
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        if (user_access('access content')) {
          $result = db_query_range('SELECT uid, name FROM {users} WHERE status != 0 ORDER BY uid DESC', 0, 5);
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          while ($account = db_fetch_object($result)) {
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            $items[] = format_name($account);
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          }
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          $output = theme('user_list', $items);
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          $block['subject'] = t('Who\'s new');
          $block['content'] = $output;
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          return $block;
        }
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      case 3:
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        if (user_access('access content')) {
          // Count users with activity in the past defined period.
          $time_period = variable_get('user_block_seconds_online', 2700);
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          // Perform database queries to gather online user lists.
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          $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 );
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          $total_users = db_num_rows($users);
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          // Format the output with proper grammar.
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          if ($total_users == 1 && $guests->count == 1) {
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            $output = t('There is currently %members and %visitors online.', array('%members' => format_plural($total_users, '1 user', '%count users'), '%visitors' => format_plural($guests->count, '1 guest', '%count guests')));
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          }
          else {
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            $output = t('There are currently %members and %visitors online.', array('%members' => format_plural($total_users, '1 user', '%count users'), '%visitors' => format_plural($guests->count, '1 guest', '%count guests')));
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          }

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          // Display a list of currently online users.
          $max_users = variable_get('user_block_max_list_count', 10);
          if ($max_users) {
            $items = array();
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            while ($max_users-- && $uid = db_fetch_object($users)) {
              $items[] = format_name(user_load(array('uid' => $uid->uid)));
            }
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            if ($items) {
              if (db_fetch_object($users)) {
                $items[] = '...';
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              }
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              $output .= theme('item_list', $items, t('Online users:'));
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            }
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          }
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          $block['subject'] = t('Who\'s online');
          $block['content'] = $output;
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        }
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        return $block;
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    }
  }
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}

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function theme_user_picture($account) {
  if (variable_get('user_pictures', 0)) {
    if ($account->picture && file_exists($account->picture)) {
      $picture = file_create_url($account->picture);
    }
    else if (variable_get('user_picture_default', '')) {
      $picture = variable_get('user_picture_default', '');
    }

    if ($picture) {
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      $alt = t('%user\'s picture', array('%user' => $account->name ? $account->name : t(variable_get('anonymous', 'Anonymous'))));
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      $picture = theme('image', $picture, $alt, $alt, '', false);
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      if ($account->uid) {
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        $picture = l($picture, "user/$account->uid", array('title' => t('View user profile.')));
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      }

      return "<div class=\"picture\">$picture</div>";
    }
  }
}

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function theme_user_profile($account, $fields) {
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  $output = "<div class=\"profile\">\n";
  $output .= theme('user_picture', $account);
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  foreach ($fields as $category => $value) {
    $output .= "<h2>$category</h2>$value";
  }
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  $output .= "</div>\n";

  return $output;
}

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

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/**
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 * Implementation of hook_menu().
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 */
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function user_menu($may_cache) {
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  global $user;
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  $items = array();
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  $access = user_access('administer users');

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  if ($may_cache) {
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    $items[] = array('path' => 'user', 'title' => t('user account'),
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      'callback' => 'user_page', 'access' => TRUE, 'type' => MENU_CALLBACK);
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    $items[] = array('path' => 'user/login', 'title' => t('log in'),
      'type' => MENU_DEFAULT_LOCAL_TASK);
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    $items[] = array('path' => 'user/register', 'title' => t('register'),
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      'callback' => 'user_page', 'access' => $user->uid == 0 && variable_get('user_register', 1), 'type' => MENU_LOCAL_TASK);
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    $items[] = array('path' => 'user/password', 'title' => t('request new password'),
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      'callback' => 'user_page', 'access' => $user->uid == 0, 'type' => MENU_LOCAL_TASK);
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    $items[] = array('path' => 'user/help', 'title' => t('help'),
      'callback' => 'user_help_page', 'type' => MENU_CALLBACK);
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    $items[] = array('path' => 'admin/user', 'title' => t('users'),
      'callback' => 'user_admin', 'access' => $access);
    $items[] = array('path' => 'admin/user/list', 'title' => t('list'),
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      'type' => MENU_DEFAULT_LOCAL_TASK, 'weight' => -10);
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    $items[] = array('path' => 'admin/user/create', 'title' => t('add'),
      'callback' => 'user_admin', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure', 'title' => t('configure'),
      'callback' => 'user_configure', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure/settings', 'title' => t('settings'),
      'type' => MENU_DEFAULT_LOCAL_TASK, 'weight' => -10);
    $items[] = array('path' => 'admin/user/configure/access', 'title' => t('access rules'),
      'callback' => 'user_configure', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure/access/mail', 'title' => t('e-mail rules'),
      'callback' => 'user_configure', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure/access/user', 'title' => t('name rules'),
      'callback' => 'user_configure', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure/role', 'title' => t('roles'),
      'callback' => 'user_configure', 'access' => $access,
      'type' => MENU_LOCAL_TASK);
    $items[] = array('path' => 'admin/user/configure/permission', 'title' => t('permissions'),
      'callback' => 'user_configure', 'access' => $access,
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      'type' => MENU_LOCAL_TASK);
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    if (module_exist('search')) {
      $items[] = array('path' => 'admin/user/search', 'title' => t('search'),
        'callback' => 'user_admin', 'access' => $access,
        'type' => MENU_LOCAL_TASK);
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    }
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    if ($user->uid) {
      $items[] = array('path' => 'user/'. $user->uid, 'title' => t('my account'),
        'callback' => 'user_page', 'access' => TRUE);
      $items[] = array('path' => 'logout', 'title' => t('log out'),
        'access' => TRUE,
        'callback' => 'user_logout',
        'weight' => 10);
    }
    else {
      $items[] = array('path' => 'logout', 'title' => t('log out'),
        'callback' => 'user_logout', 'access' => FALSE);
    }
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  }
  else {
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    if (arg(0) == 'user' && is_numeric(arg(1))) {
      $items[] = array('path' => 'user/'. arg(1), 'title' => t('user'),
        'type' => MENU_CALLBACK, 'callback' => 'user_page', 'access' => TRUE);
      $items[] = array('path' => 'user/'. arg(1) .'/view', 'title' => t('view'),
        'type' => MENU_DEFAULT_LOCAL_TASK, 'weight' => -10);
      $items[] = array('path' => 'user/'. arg(1) .'/edit', 'title' => t('edit'),
        'callback' => 'user_edit', 'access' => $access || $user->uid == arg(1),
        'type' => MENU_LOCAL_TASK);

      if (arg(2) == 'edit') {
        if (($categories = _user_categories()) && (count($categories) > 1)) {
          foreach ($categories as $key => $category) {
            $items[] = array('path' => 'user/'. arg(1) .'/edit/'. $category['name'], 'title' => $category['title'],
              'type' => $category['name'] == 'account' ? MENU_DEFAULT_LOCAL_TASK : MENU_LOCAL_TASK,
              'weight' => $category['weight']);
          }
        }
      }
    }
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  }
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  return $items;
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}

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/**
 * Called by authentication modules in order to edit/view their authmap information.
 */
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function user_get_authname($account, $module) {
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  $result = db_query("SELECT authname FROM {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module);
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  return db_result($result);
}

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/**
 * Accepts an user object, $account, or a DA name and returns an associative
 * array of modules and DA names. Called at external login.
 */
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function user_get_authmaps($authname = NULL) {
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  $result = db_query("SELECT authname, module FROM {authmap} WHERE authname = '%s'", $authname);
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  if (db_num_rows($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) {
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    $module = explode('_', $key, 2);
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    if ($value) {
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      db_query("UPDATE {authmap} SET authname = '%s' WHERE uid = %d AND module = '%s'", $value, $account->uid, $module['1']);
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      if (!db_affected_rows()) {
        db_query("INSERT INTO {authmap} (authname, uid, module) VALUES ('%s', %d, '%s')", $value, $account->uid, $module[1]);
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      }
    }
    else {
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      db_query("DELETE FROM {authmap} WHERE uid = %d AND module = '%s'", $account->uid, $module['1']);
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    }
  }
}

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

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

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function user_login($edit = array(), $msg = '') {
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  global $user, $base_url;
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  // If we are already logged on, go to the user page instead.
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  if ($user->uid) {
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    drupal_goto('user');
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  }

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  if (user_deny('user', $edit['name'])) {
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    $error = t('The name %s has been denied access.', array('%s' => '<em>'. $edit['name'] .'</em>'));
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  }
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  else if ($edit['name'] && $edit['pass']) {
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    if (!$user->uid) {
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      $user = user_authenticate($edit['name'], $edit['pass']);
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    }

    if ($user->uid) {
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      watchdog('user', t('Session opened for %name.', array('%name' => "<em>$user->name</em>")));
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      // Update the user table timestamp noting user has logged in.
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      db_query("UPDATE {users} SET changed = '%d' WHERE uid = '%s'", time(), $user->uid);
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      user_module_invoke('login', $edit, $user);
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      // If the user wants to be remembered, set the proper cookie such
      // that the session won't expire.
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      $path = preg_replace("/.+\/\/[^\/]+(.*)/", "\$1/", $base_url);
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      setcookie(session_name(), session_id(), FALSE, $path);
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      // Redirect the user to the page he logged on from.
      drupal_goto($edit['destination']);
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    }
    else {
      if (!$error) {
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        $error = t('Sorry.  Unrecognized username or password.') .' '. l(t('Have you forgotten your password?'), 'user/password');
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      }
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      watchdog('user', t('Login attempt failed for %user: %error.', array('%user' => '<em>'. $edit['name'] .'</em>', '%error' => '<em>'. $error .'</em>')));
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    }
  }

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  // Display error message (if any):
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  if ($error) {
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    drupal_set_message($error, 'error');
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  }

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  // Save the referrer.  We record where the user came from such that we
  // can redirect him after having completed the login form.
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  if (empty($edit)) {
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    $edit['destination'] = $_GET['q'];
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  }
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  $output .= form_hidden('destination', $edit['destination']);
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  // Display login form:
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  if ($msg) {
    $output .= "<p>$msg</p>";
  }
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  if (count(user_auth_help_links()) > 0) {
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    $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()))));
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  }
  else {
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    $output .= form_textfield(t('Username'), 'name', $edit['name'], 30, 64, t('Enter your %s username.', array('%s' => variable_get('site_name', 'local'))));
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  }
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  $output .= form_password(t('Password'), 'pass', $pass, 30, 64, t('Enter the password that accompanies your username.'));
  $output .= form_submit(t('Log in'));
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  return form($output, 'post', url('user/login'));
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}
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function user_authenticate($name, $pass) {
  global $user;

  // Try to log in the user locally:
  $user = user_load(array('name' => $name, 'pass' => $pass, 'status' => 1));

  // Strip name and server from ID:
  if ($server = strrchr($name, '@')) {
    $name = substr($name, 0, strlen($name) - strlen($server));
    $server = substr($server, 1);
  }

  // When possible, determine corresponding external auth source. Invoke
  // source, and log in 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@$server");
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      watchdog('user', t('External load by %user using module %module.', array('%user' => "<em>$name@$server</em>", '%module' => '<em>'. key($result) .'</em>')));
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    }
    else {
      $error = t('Invalid password for %s.', array('%s' => "<em>$name@$server</em>"));
    }
  }

  // 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) {
            $account = user_load(array('name' => "$name@$server"));
            if (!$account->uid) { // Register this new user.
              $user = user_save('', array('name' => "$name@$server", 'pass' => user_password(), 'init' => "$name@$server", 'status' => 1, "authname_$module" => "$name@$server", 'roles' => array(_user_authenticated_id())));
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              watchdog('user', t('New external user: %user using module %module.', array('%user' => "<em>$name@$server</em>", '%module' => "<em>$module</em>")), l(t('edit'), 'user/'. $user->uid .'/edit'));
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              break;
            }
          }
        }
      }
    }
  }
  return $user;
}
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function _user_authenticated_id() {
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  return db_result(db_query("SELECT rid FROM {role} WHERE name = 'authenticated user'"));
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}

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/**
 * Menu callback; logs the current user out, and redirects to the home page.
 */
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function user_logout() {
  global $user;

  if ($user->uid) {
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    watchdog('user', t('Session closed for %name.', array('%name' => "<em>$user->name</em>")));
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    // Destroy the current session:
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    session_destroy();
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    module_invoke_all('user', 'logout', NULL, $user);
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    unset($user);
  }