Implemented account deletion. Not all cases covered with tests [skip ci]

common/tasks/DeleteAccount.php

@@ -0,0 +1,62 @@
+<?php
+declare(strict_types=1);
+
+namespace common\tasks;
+
+use common\models\Account;
+use Yii;
+use yii\queue\RetryableJobInterface;
+
+final class DeleteAccount implements RetryableJobInterface {
+
+    private int $accountId;
+
+    public function __construct(int $accountId) {
+        $this->accountId = $accountId;
+    }
+
+    public function getTtr(): int {
+        return PHP_INT_MAX; // Let it work as long as it needs to
+    }
+
+    public function canRetry($attempt, $error): bool {
+        return true;
+    }
+
+    /**
+     * @param \yii\queue\Queue $queue
+     * @throws \Throwable
+     */
+    public function execute($queue): void {
+        $account = Account::findOne(['id' => $this->accountId]);
+        if ($account === null || $this->shouldAccountBeDeleted($account) === false) {
+            return;
+        }
+
+        $transaction = Yii::$app->db->beginTransaction();
+
+        (new ClearAccountSessions($account->id))->execute($queue);
+        foreach ($account->oauthClients as $oauthClient) {
+            (new ClearOauthSessions($oauthClient->id))->execute($queue);
+        }
+
+        /** @var \common\models\EmailActivation $emailActivation */
+        foreach ($account->getEmailActivations()->each(100, Yii::$app->unbufferedDb) as $emailActivation) {
+            $emailActivation->delete();
+        }
+
+        /** @var \common\models\UsernameHistory $usernameHistoryEntry */
+        foreach ($account->getUsernameHistory()->each(100, Yii::$app->unbufferedDb) as $usernameHistoryEntry) {
+            $usernameHistoryEntry->delete();
+        }
+
+        $account->delete();
+
+        $transaction->commit();
+    }
+
+    private function shouldAccountBeDeleted(Account $account): bool {
+        return $account->status === Account::STATUS_DELETED && $account->getDeleteAt()->subSecond()->isPast();
+    }
+
+}