Validation is ready.

composer.json

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+{
+    "name": "kor-elf/captcha-rule-for-laravel",
+    "description": "Validation Rule Captcha for Laravel",
+    "license": "MIT",
+    "type": "library",
+    "keywords": [
+        "captcha",
+        "laravel",
+        "validation"
+    ],
+    "homepage": "https://git.kor-elf.net/kor-elf/captcha-rule-for-laravel",
+    "authors": [
+        {
+            "name": "Leonid Nikitin",
+            "email": "i@kor-elf.net",
+            "homepage": "https://git.kor-elf.net/kor-elf",
+            "role": "Developer"
+        }
+    ],
+    "require": {
+        "php": "^8.2",
+        "illuminate/support": "^10.0",
+        "guzzlehttp/guzzle": "^7.0.1"
+    },
+    "extra": {
+        "laravel": {
+            "providers": [
+                "korElf\\CaptchaRuleForLaravel\\CaptchaProvider"
+            ]
+        }
+    },
+    "autoload": {
+        "psr-4": {
+            "korElf\\CaptchaRuleForLaravel\\": "src/"
+        },
+        "files": [
+            "src/helpers.php"
+        ]
+    }
+}

config/captcha.php

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+<?php
+
+/**
+ * Copyright (c) 2023
+ * author: Leonid Nikitin - i@kor-elf.net
+ * web: https://git.kor-elf.net/kor-elf
+ * Initial version created on: 02.12.2023
+ * MIT license: https://git.kor-elf.net/kor-elf/captcha-rule-for-laravel/src/branch/main/LICENSE.md
+ */
+
+return [
+    /*
+     * Указываем адрес к сервису для проверки от робота.
+     * Примеры: http://captcha.localhost:9008, https://captcha.localhost, http://captcha.localhost
+     */
+    'api_domain' => env('CAPTCHA_API_DOMAIN'),
+
+    /*
+     * Приватный токен для проверки получаемого ключа после успешной проверки от бота.
+     */
+    'api_private_token' => env('CAPTCHA_PRIVATE_TOKEN'),
+
+    /*
+     * Curl timeout в секундах.
+     */
+    'curl_timeout' => (int) env('CAPTCHA_CURL_TIMEOUT', 10),
+
+    /*
+     * Включает Blade::directive "captcha".
+     */
+    'enable_blade_captcha' => (bool) env('CAPTCHA_ENABLE_BLADE_CAPTCHA', true),
+
+    /*
+     * Публичный токен для начало проверки я не робот.
+     */
+    'api_public_token' => env('CAPTCHA_PUBLIC_TOKEN'),
+
+    /**
+     * Указываем путь к статике, на данный момент это к стилям.
+     * Примеры: /captcha, https://captcha.localhost/captcha
+     */
+    'static_path' => env('CAPTCHA_STATIC_PATH', env('CAPTCHA_API_DOMAIN') . '/captcha'),
+
+    /*
+     * Используется в переводах.
+     */
+    'error_message_key' => 'validation.captcha',
+
+    /*
+     * Имя Validator::extendImplicit.
+     */
+    'rule_name' => 'captcha',
+
+    /*
+     * Name в input после успешной проверки.
+     */
+    'captcha_verified_name' => 'captcha-verified',
+];

src/CaptchaProvider.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Support\ServiceProvider;
+use Illuminate\Support\Facades\Blade;
+use Illuminate\Contracts\Foundation\Application;
+
+final class CaptchaProvider extends ServiceProvider
+{
+    public function boot(): Void
+    {
+        $this->addValidationRule();
+        $this->publishes([
+            __DIR__ . '/../config/captcha.php' => config_path('captcha.php'),
+        ], 'config');
+
+        if (config('captcha.enable_blade_captcha')) {
+            Blade::directive('captcha', function () {
+                return "<?php echo \korElf\CaptchaRuleForLaravel\htmlCaptcha(); ?>";
+            });
+        }
+    }
+
+    /**
+     * Extends Validator to include a captcha type
+     */
+    public function addValidationRule(): Void
+    {
+        $message = trans(config('captcha.error_message_key'));
+        Validator::extendImplicit(config('captcha.rule_name'), function ($attribute, $value) {
+            if (!is_string($value)) {
+                return false;
+            }
+            return app(CaptchaService::class)->validate($value, request()->userAgent());
+        }, $message);
+    }
+
+    /**
+     * Register the service provider.
+     *
+     * @return void
+     */
+    public function register(): Void
+    {
+        $this->mergeConfigFrom(
+            __DIR__ . '/../config/captcha.php',
+            'captcha'
+        );
+
+        $this->app->singleton(CaptchaService::class, function (Application $app) {
+            return new CaptchaService(
+                privateToken: config('captcha.api_private_token', ''),
+                domainApi: config('captcha.api_domain', ''),
+                curlTimeout: config('captcha.curl_timeout', ''),
+            );
+        });
+    }
+}

src/CaptchaService.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+use Illuminate\Support\Facades\Http;
+
+final readonly class CaptchaService
+{
+    public function __construct(
+        private string $privateToken,
+        private string $domainApi,
+        private int $curlTimeout = 10,
+    ) { }
+
+    public function validate(string $token, ?string $userAgent = null): bool
+    {
+        try {
+            $post = [];
+            if (!is_null($userAgent)) {
+                $post['user_ageng'] = $userAgent;
+            }
+
+            $response = Http::withHeaders([
+                'private-token' => $this->privateToken,
+            ])
+                ->timeout($this->curlTimeout)
+                ->post($this->domainApi . '/api/v1/captcha/' . $token, $post);
+
+            return ($response->json('status') === true);
+        } catch (\Throwable $e) {
+
+        }
+        return false;
+    }
+}

src/helpers.php

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+<?php declare(strict_types=1);
+
+namespace korElf\CaptchaRuleForLaravel;
+
+function htmlCaptcha(): string
+{
+    return '<div class="captcha-service-kor-elf" data-domain="' . config('captcha.api_domain') . '" data-static-path="' . config('captcha.static_path') . '" data-token="' . config('captcha.api_public_token') . '" data-captcha-verified-name="' . config('captcha.captcha_verified_name') . '"></div><script src="' . config('captcha.static_path') . '/script.js" async></script>';
+}