Образован валидатор UsernameValidator

common/validators/UsernameValidator.php

@@ -0,0 +1,59 @@
+<?php
+namespace common\validators;
+
+use common\helpers\Error as E;
+use common\models\Account;
+use yii\base\Model;
+use yii\db\QueryInterface;
+use yii\validators;
+use yii\validators\Validator;
+
+class UsernameValidator extends Validator {
+
+    /**
+     * @var \Closure функция должна возвращать id аккаунта, относительно которого проводится
+     * текущая валидация. Позволяет пропустить проверку ника для текущего аккаунта.
+     */
+    public $accountCallback;
+
+    public $skipOnEmpty = false;
+
+    public function validateAttribute($model, $attribute) {
+        $filter = new validators\FilterValidator(['filter' => 'trim']);
+
+        $required = new validators\RequiredValidator();
+        $required->message = E::USERNAME_REQUIRED;
+
+        $length = new validators\StringValidator();
+        $length->min = 3;
+        $length->max = 21;
+        $length->tooShort = E::USERNAME_TOO_SHORT;
+        $length->tooLong = E::USERNAME_TOO_LONG;
+
+        $pattern = new validators\RegularExpressionValidator(['pattern' => '/^[\p{L}\d-_\.!?#$%^&*()\[\]:;]+$/u']);
+        $pattern->message = E::USERNAME_INVALID;
+
+        $unique = new validators\UniqueValidator();
+        $unique->message = E::USERNAME_NOT_AVAILABLE;
+        $unique->targetClass = Account::class;
+        $unique->targetAttribute = 'username';
+        if ($this->accountCallback !== null) {
+            $unique->filter = function(QueryInterface $query) {
+                $query->andWhere(['NOT', ['id' => ($this->accountCallback)()]]);
+            };
+        }
+
+        $this->executeValidation($filter, $model, $attribute) &&
+        $this->executeValidation($required, $model, $attribute) &&
+        $this->executeValidation($length, $model, $attribute) &&
+        $this->executeValidation($pattern, $model, $attribute) &&
+        $this->executeValidation($unique, $model, $attribute);
+    }
+
+    protected function executeValidation(Validator $validator, Model $model, string $attribute) {
+        $validator->validateAttribute($model, $attribute);
+
+        return !$model->hasErrors($attribute);
+    }
+
+}