User.php

1. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/field/User.php
2. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/argument_validator/User.php
3. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/User.php
4. 9.x drupal/core/modules/user/lib/Drupal/user/Plugin/Core/Entity/User.php

<?php

/**
 * @file
 * Definition of Drupal\user\Plugin\views\argument_validator\User.
 */
namespace Drupal\user\Plugin\views\argument_validator;

use Drupal\Core\Annotation\Plugin;
use Drupal\Core\Annotation\Translation;
use Drupal\views\Plugin\views\argument_validator\ArgumentValidatorPluginBase;

/**
 * Validate whether an argument is a valid user.
 *
 * This supports either numeric arguments (UID) or strings (username) and
 * converts either one into the user's UID.  This validator also sets the
 * argument's title to the username.
 *
 * @Plugin(
 *   id = "user",
 *   module = "user",
 *   title = @Translation("User")
 * )
 */
class User extends ArgumentValidatorPluginBase {
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['type'] = array(
      'default' => 'uid',
    );
    $options['restrict_roles'] = array(
      'default' => FALSE,
      'bool' => TRUE,
    );
    $options['roles'] = array(
      'default' => array(),
    );
    return $options;
  }
  public function buildOptionsForm(&$form, &$form_state) {
    $form['type'] = array(
      '#type' => 'radios',
      '#title' => t('Type of user filter value to allow'),
      '#options' => array(
        'uid' => t('Only allow numeric UIDs'),
        'name' => t('Only allow string usernames'),
        'either' => t('Allow both numeric UIDs and string usernames'),
      ),
      '#default_value' => $this->options['type'],
    );
    $form['restrict_roles'] = array(
      '#type' => 'checkbox',
      '#title' => t('Restrict user based on role'),
      '#default_value' => $this->options['restrict_roles'],
    );
    $form['roles'] = array(
      '#type' => 'checkboxes',
      '#title' => t('Restrict to the selected roles'),
      '#options' => array_map('check_plain', user_roles(TRUE)),
      '#default_value' => $this->options['roles'],
      '#description' => t('If no roles are selected, users from any role will be allowed.'),
      '#states' => array(
        'visible' => array(
          ':input[name="options[validate][options][user][restrict_roles]"]' => array(
            'checked' => TRUE,
          ),
        ),
      ),
    );
  }
  public function submitOptionsForm(&$form, &$form_state, &$options = array()) {

    // filter trash out of the options so we don't store giant unnecessary arrays
    $options['roles'] = array_filter($options['roles']);
  }
  function validate_argument($argument) {
    $type = $this->options['type'];

    // is_numeric() can return false positives, so we ensure it's an integer.
    // However, is_integer() will always fail, since $argument is a string.
    if (is_numeric($argument) && $argument == (int) $argument) {
      if ($type == 'uid' || $type == 'either') {
        if ($argument == $GLOBALS['user']->uid) {

          // If you assign an object to a variable in PHP, the variable
          // automatically acts as a reference, not a copy, so we use
          // clone to ensure that we don't actually mess with the
          // real global $user object.
          $account = clone $GLOBALS['user'];
        }
        $condition = 'uid';
      }
    }
    else {
      if ($type == 'name' || $type == 'either') {
        $name = !empty($GLOBALS['user']->name) ? $GLOBALS['user']->name : config('user.settings')
          ->get('anonymous');
        if ($argument == $name) {
          $account = clone $GLOBALS['user'];
        }
        $condition = 'name';
      }
    }

    // If we don't have a WHERE clause, the argument is invalid.
    if (empty($condition)) {
      return FALSE;
    }
    if (!isset($account)) {
      $account = db_select('users', 'u')
        ->fields('u', array(
        'uid',
        'name',
      ))
        ->condition($condition, $argument)
        ->execute()
        ->fetchObject();
    }
    if (empty($account)) {

      // User not found.
      return FALSE;
    }

    // See if we're filtering users based on roles.
    if (!empty($this->options['restrict_roles']) && !empty($this->options['roles'])) {
      $roles = $this->options['roles'];
      $account->roles = array();
      $account->roles[] = $account->uid ? DRUPAL_AUTHENTICATED_RID : DRUPAL_ANONYMOUS_RID;
      $query = db_select('users_roles', 'u');
      $query
        ->addField('u', 'rid');
      $query
        ->condition('u.uid', $account->uid);
      $result = $query
        ->execute();
      foreach ($result as $role) {
        $account->roles[] = $role->rid;
      }
      if (!(bool) array_intersect($account->roles, $roles)) {
        return FALSE;
      }
    }
    $this->argument->argument = $account->uid;
    $this->argument->validated_title = check_plain(user_format_name($account));
    return TRUE;
  }
  function process_summary_arguments(&$args) {

    // If the validation says the input is an username, we should reverse the
    // argument so it works for example for generation summary urls.
    $uids_arg_keys = array_flip($args);
    if ($this->options['type'] == 'name') {
      $users = user_load_multiple($args);
      foreach ($users as $uid => $account) {
        $args[$uids_arg_keys[$uid]] = $account->name;
      }
    }
  }

}