controlador-descarga/models/Usuario.php

<?php

namespace app\models;

class Usuario extends \yii\base\BaseObject implements \yii\web\IdentityInterface {

  public $id;
  public $username;
  public $password;
  public $authKey;
  public $accessToken;

  private static $users = [
    '100' => [
      'id' => '100',
      'username' => 'admin@audiovalid.com',
      'password' => 'AudioValid2021',
      'authKey' => 'test100key',
      'accessToken' => '100-token',
    ],
  ];


  /**
   * {@inheritdoc}
   */
  public static function findIdentity($id) {
    return isset(self::$users[$id]) ? new static(self::$users[$id]) : null;
  }

  /**
   * {@inheritdoc}
   */
  public static function findIdentityByAccessToken($token, $type = null) {
    foreach (self::$users as $user) {
      if ($user['accessToken'] === $token) {
        return new static($user);
      }
    }

    return null;
  }

  /**
   * Finds user by username
   *
   * @param string $username
   * @return static|null
   */
  public static function findByUsername($username) {
    foreach (self::$users as $user) {
      if (strcasecmp($user['username'], $username) === 0) {
        return new static($user);
      }
    }

    return null;
  }

  /**
   * {@inheritdoc}
   */
  public function getId() {
    return $this->id;
  }

  /**
   * {@inheritdoc}
   */
  public function getAuthKey() {
    return $this->authKey;
  }

  /**
   * {@inheritdoc}
   */
  public function validateAuthKey($authKey) {
    return $this->authKey === $authKey;
  }

  /**
   * Validates password
   *
   * @param string $password password to validate
   * @return bool if password provided is valid for current user
   */
  public function validatePassword($password) {
    return $this->password === $password;
  }
}