Add captcha tokens management.

app/Services/GenerateTokenCommand/GenerateTokenCommand.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types=1);
+
+namespace App\Services\GenerateTokenCommand;
+
+use App\Contracts\GenerateTokenCommand as GenerateTokenCommandContract;
+use App\Exceptions\Service\GenerateTokenCommandException;
+use Illuminate\Database\Eloquent\Builder;
+
+abstract readonly class GenerateTokenCommand implements GenerateTokenCommandContract
+{
+    /**
+     * @return string
+     */
+    abstract public function execute(): string;
+
+    /**
+     * @param Builder $builder
+     * @param string $field
+     * @param int $numberAttempts
+     * @return string
+     * @throws GenerateTokenCommandException
+     */
+    public function unique(Builder $builder, string $field, int $numberAttempts = 10): string
+    {
+        for ($attempt = 0; $attempt < $numberAttempts; ++$attempt) {
+            $token = $this->execute();
+            if ($builder->where($field, '=', $token)->doesntExist()) {
+                return $token;
+            }
+        }
+
+        throw new GenerateTokenCommandException(__('Failed to generate token.'));
+    }
+}