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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://www.yiiframework.com/license/
 */

namespace yii\behaviors;

use Yii;
use yii\db\BaseActiveRecord;

/**
 * BlameableBehavior automatically fills the specified attributes with the current user ID.
 *
 * To use BlameableBehavior, insert the following code to your ActiveRecord class:
 *
 * ```php
 * use yii\behaviors\BlameableBehavior;
 *
 * public function behaviors()
 * {
 *     return [
 *         BlameableBehavior::class,
 *     ];
 * }
 * ```
 *
 * By default, BlameableBehavior will fill the `created_by` and `updated_by` attributes with the current user ID
 * when the associated AR object is being inserted; it will fill the `updated_by` attribute
 * with the current user ID when the AR object is being updated.
 *
 * Because attribute values will be set automatically by this behavior, they are usually not user input and should therefore
 * not be validated, i.e. `created_by` and `updated_by` should not appear in the [[\yii\base\Model::rules()|rules()]] method of the model.
 *
 * If your attribute names are different, you may configure the [[createdByAttribute]] and [[updatedByAttribute]]
 * properties like the following:
 *
 * ```php
 * public function behaviors()
 * {
 *     return [
 *         [
 *             'class' => BlameableBehavior::class,
 *             'createdByAttribute' => 'author_id',
 *             'updatedByAttribute' => 'updater_id',
 *         ],
 *     ];
 * }
 * ```
 *
 * @author Luciano Baraglia <luciano.baraglia@gmail.com>
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Alexander Kochetov <creocoder@gmail.com>
 * @since 2.0
 */
class BlameableBehavior extends AttributeBehavior
{
    /**
     * @var string the attribute that will receive current user ID value
     * Set this property to false if you do not want to record the creator ID.
     */
    public $createdByAttribute = 'created_by';
    /**
     * @var string the attribute that will receive current user ID value
     * Set this property to false if you do not want to record the updater ID.
     */
    public $updatedByAttribute = 'updated_by';
    /**
     * {@inheritdoc}
     *
     * In case, when the property is `null`, the value of `Yii::$app->user->id` will be used as the value.
     */
    public $value;
    /**
     * @var mixed Default value for cases when the user is guest
     * @since 2.0.14
     */
    public $defaultValue;

/**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();

if (empty($this->attributes)) {
            $this->attributes = [
                BaseActiveRecord::EVENT_BEFORE_INSERT => [$this->createdByAttribute, $this->updatedByAttribute],
                BaseActiveRecord::EVENT_BEFORE_UPDATE => $this->updatedByAttribute,
            ];
        }
    }

/**
     * {@inheritdoc}
     *
     * In case, when the [[value]] property is `null`, the value of [[defaultValue]] will be used as the value.
     */
    protected function getValue($event)
    {
        if ($this->value === null && Yii::$app->has('user')) {
            $userId = Yii::$app->get('user')->id;
            if ($userId === null) {
                return $this->getDefaultValue($event);
            }

return $userId;
        } elseif ($this->value === null) {
            return $this->getDefaultValue($event);
        }

return parent::getValue($event);
    }

/**
     * Get default value
     * @param \yii\base\Event $event
     * @return array|mixed
     * @since 2.0.14
     */
    protected function getDefaultValue($event)
    {
        if ($this->defaultValue instanceof \Closure || (is_array($this->defaultValue) && is_callable($this->defaultValue))) {
            return call_user_func($this->defaultValue, $event);
        }

return $this->defaultValue;
    }
}