<?php

/**
 * @file
 * Install, update and uninstall functions for the user module.
 */

/**
 * Implements hook_schema().
 */
function user_schema() {
  $schema['authmap'] = array(
    'description' => 'Stores distributed authentication mapping.',
    'fields' => array(
      'aid' => array(
        'description' => 'Primary Key: Unique authmap ID.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'uid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => "User's {users}.uid.",
      ),
      'authname' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Unique authentication name.',
      ),
      'module' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Module which is controlling the authentication.',
      ),
    ),
    'unique keys' => array(
      'authname' => array('authname'),
    ),
    'primary key' => array('aid'),
    'foreign keys' => array(
      'user' => array(
        'table' => 'users',
        'columns' => array('uid' => 'uid'),
      ),
    ),
    'indexes' => array(
      'uid_module' => array('uid', 'module'),
    ),
  );

  $schema['role_permission'] = array(
    'description' => 'Stores the permissions assigned to user roles.',
    'fields' => array(
      'rid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'description' => 'Foreign Key: {role}.rid.',
      ),
      'permission' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'A single permission granted to the role identified by rid.',
      ),
      'module' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => "The module declaring the permission.",
      ),
    ),
    'primary key' => array('rid', 'permission'),
    'indexes' => array(
      'permission' => array('permission'),
    ),
    'foreign keys' => array(
      'role' => array(
        'table' => 'role',
        'columns' => array('rid' => 'rid'),
      ),
    ),
  );

  $schema['role'] = array(
    'description' => 'Stores user roles.',
    'fields' => array(
      'rid' => array(
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'description' => 'Primary Key: Unique role ID.',
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Unique role name.',
        'translatable' => TRUE,
      ),
      'weight' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The weight of this role in listings and the user interface.',
      ),
    ),
    'unique keys' => array(
      'name' => array('name'),
    ),
    'primary key' => array('rid'),
    'indexes' => array(
      'name_weight' => array('name', 'weight'),
    ),
  );

  // The table name here is plural, despite Drupal table naming standards,
  // because "user" is a reserved word in many databases.
  $schema['users'] = array(
    'description' => 'Stores user data.',
    'fields' => array(
      'uid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'description' => 'Primary Key: Unique user ID.',
        'default' => 0,
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 60,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Unique user name.',
      ),
      'pass' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => "User's password (hashed).",
      ),
      'mail' => array(
        'type' => 'varchar',
        'length' => 254,
        'not null' => FALSE,
        'default' => '',
        'description' => "User's e-mail address.",
      ),
      'theme' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => "User's default theme.",
      ),
      'signature' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => "User's signature.",
      ),
      'signature_format' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
        'description' => 'The {filter_format}.format of the signature.',
      ),
      'created' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Timestamp for when user was created.',
      ),
      'changed' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Timestamp for when user was changed.',
      ),
      'access' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Timestamp for previous time user accessed the site.',
      ),
      'login' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => "Timestamp for user's last login.",
      ),
      'status' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Whether the user is active(1) or blocked(0).',
      ),
      'timezone' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => FALSE,
        'description' => "User's time zone.",
      ),
      'language' => array(
        'type' => 'varchar',
        'length' => 12,
        'not null' => TRUE,
        'default' => '',
        'description' => "User's default language.",
      ),
      'picture' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => "Foreign key: {file_managed}.fid of user's picture.",
      ),
      'init' => array(
        'type' => 'varchar',
        'length' => 254,
        'not null' => FALSE,
        'default' => '',
        'description' => 'E-mail address used for initial account creation.',
      ),
      'data' => array(
        'type' => 'blob',
        'not null' => FALSE,
        'size' => 'big',
        'serialize' => TRUE,
        'description' => 'A serialized array of name value pairs that are related to the user. Any form values posted during user edit are stored and are loaded into the $user object during user_load(). Use of this field is discouraged and it will likely disappear in a future version of Drupal.',
      ),
    ),
    'indexes' => array(
      'access' => array('access'),
      'created' => array('created'),
      'changed' => array('changed'),
      'mail' => array('mail'),
      'picture' => array('picture'),
    ),
    'unique keys' => array(
      'name' => array('name'),
    ),
    'primary key' => array('uid'),
    'foreign keys' => array(
      'signature_format' => array(
        'table' => 'filter_format',
        'columns' => array('signature_format' => 'format'),
      ),
    ),
  );

  $schema['users_roles'] = array(
    'description' => 'Maps users to roles.',
    'fields' => array(
      'uid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Primary Key: {users}.uid for user.',
      ),
      'rid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Primary Key: {role}.rid for role.',
      ),
    ),
    'primary key' => array('uid', 'rid'),
    'indexes' => array(
      'rid' => array('rid'),
    ),
    'foreign keys' => array(
      'user' => array(
        'table' => 'users',
        'columns' => array('uid' => 'uid'),
      ),
      'role' => array(
        'table' => 'role',
        'columns' => array('rid' => 'rid'),
      ),
    ),
  );

  return $schema;
}

/**
 * Implements hook_install().
 */
function user_install() {
  // Insert a row for the anonymous user.
  db_insert('users')
    ->fields(array(
      'uid' => 0,
      'name' => '',
      'mail' => '',
    ))
    ->execute();

  // We need some placeholders here as name and mail are uniques and data is
  // presumed to be a serialized array. This will be changed by the settings
  // form in the installer.
  db_insert('users')
    ->fields(array(
      'uid' => 1,
      'name' => 'placeholder-for-uid-1',
      'mail' => 'placeholder-for-uid-1',
      'created' => REQUEST_TIME,
      'changed' => REQUEST_TIME,
      'status' => 1,
      'data' => NULL,
    ))
    ->execute();

  // Built-in roles.
  $rid_anonymous = db_insert('role')
    ->fields(array('name' => 'anonymous user', 'weight' => 0))
    ->execute();
  $rid_authenticated = db_insert('role')
    ->fields(array('name' => 'authenticated user', 'weight' => 1))
    ->execute();

  // Sanity check to ensure the anonymous and authenticated role IDs are the
  // same as the drupal defined constants. In certain situations, this will
  // not be true.
  if ($rid_anonymous != DRUPAL_ANONYMOUS_RID) {
    db_update('role')
      ->fields(array('rid' => DRUPAL_ANONYMOUS_RID))
      ->condition('rid', $rid_anonymous)
      ->execute();
  }
  if ($rid_authenticated != DRUPAL_AUTHENTICATED_RID) {
    db_update('role')
      ->fields(array('rid' => DRUPAL_AUTHENTICATED_RID))
      ->condition('rid', $rid_authenticated)
      ->execute();
  }
}

/**
 * Implements hook_update_dependencies().
 */
function user_update_dependencies() {
  // user_update_7006() updates data in the {role_permission} table, so it must
  // run after system_update_7007(), which populates that table.
  $dependencies['user'][7006] = array(
    'system' => 7007,
  );

  // user_update_7010() needs to query the {filter_format} table to get a list
  // of existing text formats, so it must run after filter_update_7000(), which
  // creates that table.
  $dependencies['user'][7010] = array(
    'filter' => 7000,
  );

  // user_update_7012() uses the file API and inserts records into the
  // {file_managed} table, so it therefore must run after system_update_7061(),
  // which inserts files with specific IDs into the table and therefore relies
  // on the table being empty (otherwise it would accidentally overwrite
  // existing records).
  $dependencies['user'][7012] = array(
    'system' => 7061,
  );

  // user_update_7013() uses the file usage API, which relies on the
  // {file_usage} table, so it must run after system_update_7059(), which
  // creates that table.
  $dependencies['user'][7013] = array(
    'system' => 7059,
  );

  return $dependencies;
}

/**
 * Utility function: grant a set of permissions to a role during update.
 *
 * This function is valid for a database schema version 7000.
 *
 * @param $rid
 *   The role ID.
 * @param $permissions
 *   An array of permissions names.
 * @param $module
 *   The name of the module defining the permissions.
 * @ingroup update_api
 */
function _update_7000_user_role_grant_permissions($rid, array $permissions, $module) {
  // Grant new permissions for the role.
  foreach ($permissions as $name) {
    db_merge('role_permission')
      ->key(array(
        'rid' => $rid,
        'permission' => $name,
      ))
      ->fields(array(
        'module' => $module,
      ))
      ->execute();
  }
}

/**
 * @addtogroup updates-6.x-to-7.x
 * @{
 */

/**
 * Increase the length of the password field to accommodate better hashes.
 *
 * Also re-hashes all current passwords to improve security. This may be a
 * lengthy process, and is performed batch-wise.
 */
function user_update_7000(&$sandbox) {
  $sandbox['#finished'] = 0;
  // Lower than DRUPAL_HASH_COUNT to make the update run at a reasonable speed.
  $hash_count_log2 = 11;
  // Multi-part update.
  if (!isset($sandbox['user_from'])) {
    db_change_field('users', 'pass', 'pass', array('type' => 'varchar', 'length' => 128, 'not null' => TRUE, 'default' => ''));
    $sandbox['user_from'] = 0;
    $sandbox['user_count'] = db_query("SELECT COUNT(uid) FROM {users}")->fetchField();
  }
  else {
    require_once DRUPAL_ROOT . '/' . variable_get('password_inc', 'includes/password.inc');
    //  Hash again all current hashed passwords.
    $has_rows = FALSE;
    // Update this many per page load.
    $count = 1000;
    $result = db_query_range("SELECT uid, pass FROM {users} WHERE uid > 0 ORDER BY uid", $sandbox['user_from'], $count);
    foreach ($result as $account) {
      $has_rows = TRUE;

      // If the $account->pass value is not a MD5 hash (a 32 character
      // hexadecimal string) then skip it.
      if (!preg_match('/^[0-9a-f]{32}$/', $account->pass)) {
        continue;
      }

      $new_hash = user_hash_password($account->pass, $hash_count_log2);
      if ($new_hash) {
        // Indicate an updated password.
        $new_hash  = 'U' . $new_hash;
        db_update('users')
          ->fields(array('pass' => $new_hash))
          ->condition('uid', $account->uid)
          ->execute();
      }
    }
    $sandbox['#finished'] = $sandbox['user_from']/$sandbox['user_count'];
    $sandbox['user_from'] += $count;
    if (!$has_rows) {
      $sandbox['#finished'] = 1;
      return t('User passwords rehashed to improve security');
    }
  }
}

/**
 * Remove the 'threshold', 'mode' and 'sort' columns from the {users} table.
 *
 * These fields were previously used to store per-user comment settings.
 */

function user_update_7001() {
  db_drop_field('users', 'threshold');
  db_drop_field('users', 'mode');
  db_drop_field('users', 'sort');
}

/**
 * Convert user time zones from time zone offsets to time zone names.
 */
function user_update_7002(&$sandbox) {
  $sandbox['#finished'] = 0;

  // Multi-part update.
  if (!isset($sandbox['user_from'])) {
    db_change_field('users', 'timezone', 'timezone', array('type' => 'varchar', 'length' => 32, 'not null' => FALSE));
    $sandbox['user_from'] = 0;
    $sandbox['user_count'] = db_query("SELECT COUNT(uid) FROM {users}")->fetchField();
    $sandbox['user_not_migrated'] = 0;
  }
  else {
    $timezones = system_time_zones();
    // Update this many per page load.
    $count = 10000;
    $contributed_date_module = db_field_exists('users', 'timezone_name');
    $contributed_event_module = db_field_exists('users', 'timezone_id');

    $results = db_query_range("SELECT uid FROM {users} ORDER BY uid", $sandbox['user_from'], $count);
    foreach ($results as $account) {
      $timezone = NULL;
      // If the contributed Date module has created a users.timezone_name
      // column, use this data to set each user's time zone.
      if ($contributed_date_module) {
        $date_timezone = db_query("SELECT timezone_name FROM {users} WHERE uid = :uid", array(':uid' => $account->uid))->fetchField();
        if (isset($timezones[$date_timezone])) {
          $timezone = $date_timezone;
        }
      }
      // If the contributed Event module has stored user time zone information
      // use that information to update the user accounts.
      if (!$timezone && $contributed_event_module) {
        try {
          $event_timezone = db_query("SELECT t.name FROM {users} u LEFT JOIN {event_timezones} t ON u.timezone_id = t.timezone WHERE u.uid = :uid", array(':uid' => $account->uid))->fetchField();
          $event_timezone = str_replace(' ', '_', $event_timezone);
          if (isset($timezones[$event_timezone])) {
            $timezone = $event_timezone;
          }
        }
        catch (PDOException $e) {
          // Ignore error if event_timezones table does not exist or unexpected
          // schema found.
        }
      }
      if ($timezone) {
        db_update('users')
          ->fields(array('timezone' => $timezone))
          ->condition('uid', $account->uid)
          ->execute();
      }
      else {
        $sandbox['user_not_migrated']++;
        db_update('users')
          ->fields(array('timezone' => NULL))
          ->condition('uid', $account->uid)
          ->execute();
      }
      $sandbox['user_from']++;
    }

    $sandbox['#finished'] = $sandbox['user_from'] / $sandbox['user_count'];
    if ($sandbox['user_from'] == $sandbox['user_count']) {
      if ($sandbox['user_not_migrated'] > 0) {
        variable_set('empty_timezone_message', 1);
        drupal_set_message(format_string('Some user time zones have been emptied and need to be set to the correct values. Use the new <a href="@config-url">time zone options</a> to choose whether to remind users at login to set the correct time zone.', array('@config-url' => url('admin/config/regional/settings'))), 'warning');
      }
      return t('Migrated user time zones');
    }
  }
}

/**
 * Update user settings for cancelling user accounts.
 *
 * Prior to 7.x, users were not able to cancel their accounts. When
 * administrators deleted an account, all contents were assigned to uid 0,
 * which is the same as the 'user_cancel_reassign' method now.
 */
function user_update_7003() {
  // Set the default account cancellation method.
  variable_set('user_cancel_method', 'user_cancel_reassign');
  // Re-assign notification setting.
  if ($setting = variable_get('user_mail_status_deleted_notify', FALSE)) {
    variable_set('user_mail_status_canceled_notify', $setting);
    variable_del('user_mail_status_deleted_notify');
  }
  // Re-assign "Account deleted" mail strings to "Account canceled" mail.
  if ($setting = variable_get('user_mail_status_deleted_subject', FALSE)) {
    variable_set('user_mail_status_canceled_subject', $setting);
    variable_del('user_mail_status_deleted_subject');
  }
  if ($setting = variable_get('user_mail_status_deleted_body', FALSE)) {
    variable_set('user_mail_status_canceled_body', $setting);
    variable_del('user_mail_status_deleted_body');
  }
}

/**
 * Changes the users table to allow longer e-mail addresses.
 */
function user_update_7005(&$sandbox) {
  $mail_field = array(
    'type' => 'varchar',
    'length' => 254,
    'not null' => FALSE,
    'default' => '',
    'description' => "User's e-mail address.",
  );
  $init_field = array(
    'type' => 'varchar',
    'length' => 254,
    'not null' => FALSE,
    'default' => '',
    'description' => 'E-mail address used for initial account creation.',
  );
  db_drop_index('users', 'mail');
  db_change_field('users', 'mail', 'mail', $mail_field, array('indexes' => array('mail' => array('mail'))));
  db_change_field('users', 'init', 'init', $init_field);
}

/**
 * Add module data to {role_permission}.
 */
function user_update_7006(&$sandbox) {
  $module_field = array(
    'type' => 'varchar',
    'length' => 255,
    'not null' => TRUE,
    'default' => '',
    'description' => "The module declaring the permission.",
  );
  // Check that the field hasn't been updated in an aborted run of this
  // update.
  if (!db_field_exists('role_permission', 'module')) {
    // Add a new field for the fid.
    db_add_field('role_permission', 'module', $module_field);
  }
}

/**
 * Add a weight column to user roles.
 */
function user_update_7007() {
  db_add_field('role', 'weight', array('type' => 'int', 'not null' => TRUE, 'default' => 0));
  db_add_index('role', 'name_weight', array('name', 'weight'));
}

/**
 * If 'user_register' variable was unset in Drupal 6, set it to be the same as
 * the Drupal 6 default setting.
 */
function user_update_7008() {
  if (!isset($GLOBALS['conf']['user_register'])) {
    // Set to the Drupal 6 default, "visitors can create accounts".
    variable_set('user_register', USER_REGISTER_VISITORS);
  }
}

/**
 * Converts fields that store serialized variables from text to blob.
 */
function user_update_7009() {
  $spec = array(
    'type' => 'blob',
    'not null' => FALSE,
    'size' => 'big',
    'serialize' => TRUE,
    'description' => 'A serialized array of name value pairs that are related to the user. Any form values posted during user edit are stored and are loaded into the $user object during user_load(). Use of this field is discouraged and it will likely disappear in a future version of Drupal.',
  );
  db_change_field('users', 'data', 'data', $spec);
}

/**
 * Update the {user}.signature_format column.
 */
function user_update_7010() {
  // Update the database column to allow NULL values.
  db_change_field('users', 'signature_format', 'signature_format', array(
    'type' => 'int',
    'unsigned' => TRUE,
    'not null' => FALSE,
    'description' => 'The {filter_format}.format of the signature.',
  ));

  // Replace the signature format with NULL if the signature is empty and does
  // not already have a stored text format.
  //
  // In Drupal 6, "0" (the former FILTER_FORMAT_DEFAULT constant) could be used
  // to indicate this situation, but in Drupal 7, only NULL is supported. This
  // update therefore preserves the ability of user accounts which were never
  // given a signature (for example, if the site did not have user signatures
  // enabled, or if the user never edited their account information) to not
  // have a particular text format assumed for them the first time the
  // signature is edited.
  db_update('users')
    ->fields(array('signature_format' => NULL))
    ->condition('signature', '')
    ->condition('signature_format', 0)
    ->execute();

  // There are a number of situations in which a Drupal 6 site could store
  // content with a nonexistent text format. This includes text formats that
  // had later been deleted, or non-empty content stored with a value of "0"
  // (the former FILTER_FORMAT_DEFAULT constant). Drupal 6 would filter this
  // content using whatever the site-wide default text format was at the moment
  // the text was being displayed.
  //
  // In Drupal 7, this behavior is no longer supported, and all content must be
  // stored with an explicit text format (or it will not be displayed when it
  // is filtered). Therefore, to preserve the behavior of the site after the
  // upgrade, we must replace all instances described above with the current
  // value of the (old) site-wide default format at the moment of the upgrade.
  $existing_formats = db_query("SELECT format FROM {filter_format}")->fetchCol();
  $default_format = variable_get('filter_default_format', 1);
  db_update('users')
    ->fields(array('signature_format' => $default_format))
    ->isNotNull('signature_format')
    ->condition('signature_format', $existing_formats, 'NOT IN')
    ->execute();
}

/**
 * Placeholder function.
 *
 * As a fix for user_update_7011() not updating email templates to use the new
 * tokens, user_update_7017() now targets email templates of Drupal 6 sites and
 * already upgraded sites.
 */
function user_update_7011() {
}

/**
 * Add the user's pictures to the {file_managed} table and make them managed
 * files.
 */
function user_update_7012(&$sandbox) {

  $picture_field = array(
    'type' => 'int',
    'not null' => TRUE,
    'default' => 0,
    'description' => "Foreign key: {file_managed}.fid of user's picture.",
  );

  if (!isset($sandbox['progress'])) {
    // Check that the field hasn't been updated in an aborted run of this
    // update.
    if (!db_field_exists('users', 'picture_fid')) {
      // Add a new field for the fid.
      db_add_field('users', 'picture_fid', $picture_field);
    }

    // Initialize batch update information.
    $sandbox['progress'] = 0;
    $sandbox['last_user_processed'] = -1;
    $sandbox['max'] = db_query("SELECT COUNT(*) FROM {users} WHERE picture <> ''")->fetchField();
  }

  // As a batch operation move the photos into the {file_managed} table and
  // update the {users} records.
  $limit = 500;
  $result = db_query_range("SELECT uid, picture FROM {users} WHERE picture <> '' AND uid > :uid ORDER BY uid", 0, $limit, array(':uid' => $sandbox['last_user_processed']));
  foreach ($result as $user) {
    // Don't bother adding files that don't exist.
    if (file_exists($user->picture)) {

      // Check if the file already exists.
      $files = file_load_multiple(array(), array('uri' => $user->picture));
      if (count($files)) {
        $file = reset($files);
      }
      else {
        // Create a file object.
        $file = new stdClass();
        $file->uri      = $user->picture;
        $file->filename = drupal_basename($file->uri);
        $file->filemime = file_get_mimetype($file->uri);
        $file->uid      = $user->uid;
        $file->status   = FILE_STATUS_PERMANENT;
        $file = file_save($file);
      }

      db_update('users')
        ->fields(array('picture_fid' => $file->fid))
        ->condition('uid', $user->uid)
        ->execute();
    }

    // Update our progress information for the batch update.
    $sandbox['progress']++;
    $sandbox['last_user_processed'] = $user->uid;
  }

  // Indicate our current progress to the batch update system. If there's no
  // max value then there's nothing to update and we're finished.
  $sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['progress'] / $sandbox['max']);

  // When we're finished, drop the old picture field and rename the new one to
  // replace it.
  if (isset($sandbox['#finished']) && $sandbox['#finished'] == 1) {
    db_drop_field('users', 'picture');
    db_change_field('users', 'picture_fid', 'picture', $picture_field);
  }
}

/**
 * Add user module file usage entries.
 */
function user_update_7013(&$sandbox) {
  if (!isset($sandbox['progress'])) {
    // Initialize batch update information.
    $sandbox['progress'] = 0;
    $sandbox['last_uid_processed'] = -1;
    $sandbox['max'] = db_query("SELECT COUNT(*) FROM {users} u WHERE u.picture <> 0")->fetchField();
  }

  // Add usage entries for the user picture files.
  $limit = 500;
  $result = db_query_range('SELECT f.*, u.uid as user_uid FROM {users} u INNER JOIN {file_managed} f ON u.picture = f.fid WHERE u.picture <> 0 AND u.uid > :uid ORDER BY u.uid', 0, $limit, array(':uid' => $sandbox['last_uid_processed']))->fetchAllAssoc('fid', PDO::FETCH_ASSOC);
  foreach ($result as $row) {
    $uid = $row['user_uid'];
    $file = (object) $row;
    file_usage_add($file, 'user', 'user', $uid);

    // Update our progress information for the batch update.
    $sandbox['progress']++;
    $sandbox['last_uid_processed'] = $uid;
  }

  // Indicate our current progress to the batch update system.
  $sandbox['#finished'] = empty($sandbox['max']) || ($sandbox['progress'] / $sandbox['max']);
}

/**
 * Rename the 'post comments without approval' permission.
 *
 * In Drupal 7, this permission has been renamed to 'skip comment approval'.
 */
function user_update_7014() {
  db_update('role_permission')
        ->fields(array('permission' => 'skip comment approval'))
        ->condition('permission', 'post comments without approval')
        ->execute();

  return t("Renamed the 'post comments without approval' permission to 'skip comment approval'.");
}

/**
 * Change {users}.signature_format into varchar.
 */
function user_update_7015() {
  db_change_field('users', 'signature_format', 'signature_format', array(
    'type' => 'varchar',
    'length' => 255,
    'not null' => FALSE,
    'description' => 'The {filter_format}.format of the signature.',
  ));
}

/**
 * @} End of "addtogroup updates-6.x-to-7.x".
 */

/**
 * @addtogroup updates-7.x-extra
 * @{
 */

/**
 * Update the database to match the schema.
 */
function user_update_7016() {
  // Add field default.
  db_change_field('users', 'uid', 'uid', array(
    'type' => 'int',
    'unsigned' => TRUE,
    'not null' => TRUE,
    'default' => 0,
  ));
}

/**
 * Update email templates to use new tokens.
 *
 * This function upgrades customized email templates from the old !token format
 * to the new core tokens format. Additionally, in Drupal 7 we no longer e-mail
 * plain text passwords to users, and there is no token for a plain text
 * password in the new token system. Therefore, it also modifies any saved
 * templates using the old '!password' token such that the token is removed, and
 * displays a warning to users that they may need to go and modify the wording
 * of their templates.
 */
function user_update_7017() {
  $message = '';

  $tokens = array(
    '!site' => '[site:name]',
    '!username' => '[user:name]',
    '!mailto' => '[user:mail]',
    '!login_uri' => '[site:login-url]',
    '!uri_brief' => '[site:url-brief]',
    '!edit_uri' => '[user:edit-url]',
    '!login_url' => '[user:one-time-login-url]',
    '!uri' => '[site:url]',
    '!date' => '[date:medium]',
    '!password' => '',
  );

  $result = db_select('variable', 'v')
    ->fields('v', array('name'))
    ->condition('name', db_like('user_mail_') . '%', 'LIKE')
    ->execute();

  foreach ($result as $row) {
    // Use variable_get() to get the unserialized value for free.
    if ($value = variable_get($row->name, FALSE)) {

      if (empty($message) && (strpos($value, '!password') !== FALSE)) {
        $message = t('The ability to send users their passwords in plain text has been removed in Drupal 7. Your existing email templates have been modified to remove it. You should <a href="@template-url">review these templates</a> to make sure they read properly.', array('@template-url' => url('admin/config/people/accounts')));
      }

      variable_set($row->name, str_replace(array_keys($tokens), $tokens, $value));
    }
  }

  return $message;
}

/**
 * Ensure there is an index on {users}.picture.
 */
function user_update_7018() {
  if (!db_index_exists('users', 'picture')) {
    db_add_index('users', 'picture', array('picture'));
  }
}

/**
 * Ensure there is a combined index on {authmap}.uid and {authmap}.module.
 */
function user_update_7019() {
  // Check first in case it was already added manually.
  if (!db_index_exists('authmap', 'uid_module')) {
    db_add_index('authmap', 'uid_module', array('uid', 'module'));
  }
}

/**
 * Add changed field to users table.
 */
function user_update_7020() {
  // The "changed" column was renamed to "access" in system_update_136(), and
  // the "changed" index on "access" column may persist on old MySQL databases.
  if (db_index_exists('users', 'changed')) {
    if (!db_index_exists('users', 'access')) {
      db_add_index('users', 'access', array('access'));
    }
    db_drop_index('users', 'changed');
  }

  $spec = array(
    'type' => 'int',
    'not null' => TRUE,
    'default' => 0,
    'description' => 'Timestamp for when user was changed.',
  );
  $keys = array(
    'indexes' => array(
      'changed' => array('changed'),
    ),
  );
  // In some cases sites have added the changed field themselves e.g. via a
  // contrib or custom module. Ensure the field uses core's new schema.
  if (db_field_exists('users', 'changed')) {
    db_change_field('users', 'changed', 'changed', $spec, $keys);
  }
  else {
    db_add_field('users', 'changed', $spec, $keys);
    // Set the initial value for existing users.
    db_update('users')
      ->expression('changed', 'created')
      ->execute();
  }

}
/**
 * @} End of "addtogroup updates-7.x-extra".
 */