feat(api): implement recaptcha v3 anti-spam protection

- Add RecaptchaValidatorInterface and RecaptchaResult entity in Domain
- Create RecaptchaValidationService in Application layer
- Implement GoogleRecaptchaValidator for API integration
- Add recaptcha-settings schema and admin FormBuilder
- Integrate reCAPTCHA validation in NewsletterAjaxHandler
- Integrate reCAPTCHA validation in ContactFormAjaxHandler
- Update FooterRenderer and ContactFormRenderer with reCAPTCHA scripts
- Configure DIContainer with RecaptchaValidationService injection

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Admin/Infrastructure/Ui/AdminDashboardRenderer.php

@@ -128,6 +128,11 @@ final class AdminDashboardRenderer implements DashboardRendererInterface
                 'label' => 'AdSense',
                 'icon' => 'bi-megaphone',
             ],
+            'recaptcha-settings' => [
+                'id' => 'recaptcha-settings',
+                'label' => 'reCAPTCHA',
+                'icon' => 'bi-shield-check',
+            ],
             'custom-css-manager' => [
                 'id' => 'custom-css-manager',
                 'label' => 'CSS Personalizado',

Admin/RecaptchaSettings/Infrastructure/FieldMapping/RecaptchaSettingsFieldMapper.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Admin\RecaptchaSettings\Infrastructure\FieldMapping;
+
+use ROITheme\Admin\Shared\Domain\Contracts\FieldMapperInterface;
+
+/**
+ * Field Mapper para reCAPTCHA Settings
+ *
+ * RESPONSABILIDAD:
+ * - Mapear field IDs del formulario a atributos de BD
+ * - Solo conoce sus propios campos (modularidad)
+ *
+ * @package ROITheme\Admin\RecaptchaSettings\Infrastructure\FieldMapping
+ */
+final class RecaptchaSettingsFieldMapper implements FieldMapperInterface
+{
+    public function getComponentName(): string
+    {
+        return 'recaptcha-settings';
+    }
+
+    public function getFieldMapping(): array
+    {
+        return [
+            // Visibility
+            'recaptchaIsEnabled' => ['group' => 'visibility', 'attribute' => 'is_enabled'],
+
+            // Credentials
+            'recaptchaSiteKey' => ['group' => 'credentials', 'attribute' => 'site_key'],
+            'recaptchaSecretKey' => ['group' => 'credentials', 'attribute' => 'secret_key'],
+
+            // Behavior
+            'recaptchaScoreThreshold' => ['group' => 'behavior', 'attribute' => 'score_threshold'],
+            'recaptchaActionNewsletter' => ['group' => 'behavior', 'attribute' => 'action_newsletter'],
+            'recaptchaActionContact' => ['group' => 'behavior', 'attribute' => 'action_contact'],
+            'recaptchaFailOpen' => ['group' => 'behavior', 'attribute' => 'fail_open'],
+            'recaptchaLogBlocked' => ['group' => 'behavior', 'attribute' => 'log_blocked'],
+        ];
+    }
+}

Admin/RecaptchaSettings/Infrastructure/Ui/RecaptchaSettingsFormBuilder.php

@@ -0,0 +1,314 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Admin\RecaptchaSettings\Infrastructure\Ui;
+
+use ROITheme\Admin\Infrastructure\Ui\AdminDashboardRenderer;
+
+/**
+ * FormBuilder para reCAPTCHA Settings
+ *
+ * RESPONSABILIDAD: Generar formulario de configuracion de Google reCAPTCHA v3
+ * para proteccion anti-spam de formularios.
+ *
+ * @package ROITheme\Admin\RecaptchaSettings\Infrastructure\Ui
+ */
+final class RecaptchaSettingsFormBuilder
+{
+    public function __construct(
+        private AdminDashboardRenderer $renderer
+    ) {}
+
+    public function buildForm(string $componentId): string
+    {
+        $html = '';
+
+        $html .= $this->buildHeader($componentId);
+        $html .= $this->buildVisibilityGroup($componentId);
+        $html .= $this->buildCredentialsGroup($componentId);
+        $html .= $this->buildBehaviorGroup($componentId);
+        $html .= $this->buildHelpSection();
+
+        return $html;
+    }
+
+    private function buildHeader(string $componentId): string
+    {
+        $html = '<div class="rounded p-4 mb-4 shadow text-white" ';
+        $html .= 'style="background: linear-gradient(135deg, #0E2337 0%, #1e3a5f 100%); border-left: 4px solid #FF8600;">';
+        $html .= '    <div class="d-flex align-items-center justify-content-between flex-wrap gap-3">';
+        $html .= '        <div>';
+        $html .= '            <h3 class="h4 mb-1 fw-bold">';
+        $html .= '                <i class="bi bi-shield-check me-2" style="color: #FF8600;"></i>';
+        $html .= '                Google reCAPTCHA v3';
+        $html .= '            </h3>';
+        $html .= '            <p class="mb-0 small" style="opacity: 0.85;">';
+        $html .= '                Proteccion anti-spam invisible para formularios';
+        $html .= '            </p>';
+        $html .= '        </div>';
+        $html .= '        <button type="button" class="btn btn-sm btn-outline-light btn-reset-defaults" data-component="recaptcha-settings">';
+        $html .= '            <i class="bi bi-arrow-counterclockwise me-1"></i>';
+        $html .= '            Restaurar valores por defecto';
+        $html .= '        </button>';
+        $html .= '    </div>';
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    private function buildVisibilityGroup(string $componentId): string
+    {
+        $html = '<div class="card shadow-sm mb-4" style="border-left: 4px solid #FF8600;">';
+        $html .= '    <div class="card-body">';
+        $html .= '        <h5 class="fw-bold mb-3" style="color: #1e3a5f;">';
+        $html .= '            <i class="bi bi-toggle-on me-2" style="color: #FF8600;"></i>';
+        $html .= '            Estado';
+        $html .= '        </h5>';
+
+        $isEnabled = $this->renderer->getFieldValue($componentId, 'visibility', 'is_enabled', false);
+        $html .= $this->buildToggle(
+            'recaptchaIsEnabled',
+            'Habilitar reCAPTCHA v3',
+            $isEnabled,
+            'Activa la proteccion reCAPTCHA en Newsletter y Formulario de Contacto'
+        );
+
+        $html .= '    </div>';
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    private function buildCredentialsGroup(string $componentId): string
+    {
+        $html = '<div class="card shadow-sm mb-4" style="border-left: 4px solid #1e3a5f;">';
+        $html .= '    <div class="card-body">';
+        $html .= '        <h5 class="fw-bold mb-3" style="color: #1e3a5f;">';
+        $html .= '            <i class="bi bi-key me-2" style="color: #FF8600;"></i>';
+        $html .= '            Credenciales';
+        $html .= '        </h5>';
+
+        $html .= '        <div class="row g-3">';
+
+        // Site Key
+        $html .= '            <div class="col-md-6">';
+        $siteKey = $this->renderer->getFieldValue($componentId, 'credentials', 'site_key', '');
+        $html .= $this->buildTextInput(
+            'recaptchaSiteKey',
+            'Site Key (Clave del sitio)',
+            $siteKey,
+            'Clave publica visible en frontend'
+        );
+        $html .= '            </div>';
+
+        // Secret Key
+        $html .= '            <div class="col-md-6">';
+        $secretKey = $this->renderer->getFieldValue($componentId, 'credentials', 'secret_key', '');
+        $html .= $this->buildPasswordInput(
+            'recaptchaSecretKey',
+            'Secret Key (Clave secreta)',
+            $secretKey,
+            'Clave privada - NUNCA se expone en frontend'
+        );
+        $html .= '            </div>';
+
+        $html .= '        </div>';
+
+        $html .= '        <div class="alert alert-warning small mb-0 mt-3">';
+        $html .= '            <i class="bi bi-exclamation-triangle me-1"></i>';
+        $html .= '            Obtiene tus claves en <a href="https://www.google.com/recaptcha/admin" target="_blank" class="alert-link">Google reCAPTCHA Admin</a>. ';
+        $html .= '            Asegurate de seleccionar <strong>reCAPTCHA v3</strong>.';
+        $html .= '        </div>';
+
+        $html .= '    </div>';
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    private function buildBehaviorGroup(string $componentId): string
+    {
+        $html = '<div class="card shadow-sm mb-4" style="border-left: 4px solid #1e3a5f;">';
+        $html .= '    <div class="card-body">';
+        $html .= '        <h5 class="fw-bold mb-3" style="color: #1e3a5f;">';
+        $html .= '            <i class="bi bi-sliders me-2" style="color: #FF8600;"></i>';
+        $html .= '            Comportamiento';
+        $html .= '        </h5>';
+
+        $html .= '        <div class="row g-3">';
+
+        // Score Threshold
+        $html .= '            <div class="col-md-6">';
+        $threshold = $this->renderer->getFieldValue($componentId, 'behavior', 'score_threshold', '0.5');
+        $html .= $this->buildSelect(
+            'recaptchaScoreThreshold',
+            'Umbral de Score',
+            $threshold,
+            [
+                '0.3' => '0.3 - Permisivo (menos bloqueos)',
+                '0.5' => '0.5 - Balanceado (recomendado)',
+                '0.7' => '0.7 - Estricto',
+                '0.9' => '0.9 - Muy estricto (mas bloqueos)'
+            ],
+            'Score minimo para considerar humano (0=bot, 1=humano)'
+        );
+        $html .= '            </div>';
+
+        // Fail Open
+        $html .= '            <div class="col-md-6">';
+        $failOpen = $this->renderer->getFieldValue($componentId, 'behavior', 'fail_open', true);
+        $html .= $this->buildToggle(
+            'recaptchaFailOpen',
+            'Permitir si API falla',
+            $failOpen,
+            'Si Google no responde, permite el envio (recomendado)'
+        );
+        $html .= '            </div>';
+
+        $html .= '        </div>';
+
+        $html .= '        <hr class="my-3">';
+
+        $html .= '        <div class="row g-3">';
+
+        // Action Newsletter
+        $html .= '            <div class="col-md-4">';
+        $actionNewsletter = $this->renderer->getFieldValue($componentId, 'behavior', 'action_newsletter', 'newsletter_submit');
+        $html .= $this->buildTextInput(
+            'recaptchaActionNewsletter',
+            'Accion Newsletter',
+            $actionNewsletter,
+            'Identificador para formulario newsletter'
+        );
+        $html .= '            </div>';
+
+        // Action Contact
+        $html .= '            <div class="col-md-4">';
+        $actionContact = $this->renderer->getFieldValue($componentId, 'behavior', 'action_contact', 'contact_submit');
+        $html .= $this->buildTextInput(
+            'recaptchaActionContact',
+            'Accion Contacto',
+            $actionContact,
+            'Identificador para formulario contacto'
+        );
+        $html .= '            </div>';
+
+        // Log Blocked
+        $html .= '            <div class="col-md-4">';
+        $logBlocked = $this->renderer->getFieldValue($componentId, 'behavior', 'log_blocked', true);
+        $html .= $this->buildToggle(
+            'recaptchaLogBlocked',
+            'Registrar bloqueados',
+            $logBlocked,
+            'Guarda log de intentos bloqueados'
+        );
+        $html .= '            </div>';
+
+        $html .= '        </div>';
+
+        $html .= '    </div>';
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    private function buildHelpSection(): string
+    {
+        $html = '<div class="card shadow-sm mb-3 bg-light">';
+        $html .= '    <div class="card-body">';
+        $html .= '        <h6 class="fw-bold mb-2" style="color: #1e3a5f;">';
+        $html .= '            <i class="bi bi-info-circle me-1" style="color: #FF8600;"></i>';
+        $html .= '            Como funciona reCAPTCHA v3';
+        $html .= '        </h6>';
+        $html .= '        <ul class="small mb-0">';
+        $html .= '            <li><strong>Invisible:</strong> No requiere interaccion del usuario (sin checkboxes ni imagenes)</li>';
+        $html .= '            <li><strong>Score:</strong> Google asigna un score de 0.0 (bot) a 1.0 (humano)</li>';
+        $html .= '            <li><strong>Protege:</strong> Newsletter Footer y Formulario de Contacto</li>';
+        $html .= '            <li><strong>Logs:</strong> Los intentos bloqueados se registran en <code>wp-content/debug.log</code></li>';
+        $html .= '        </ul>';
+        $html .= '    </div>';
+        $html .= '</div>';
+
+        return $html;
+    }
+
+    private function buildToggle(string $id, string $label, mixed $value, string $helpText = ''): string
+    {
+        $checked = ($value === true || $value === '1' || $value === 1) ? ' checked' : '';
+
+        $html = '        <div class="mb-3">';
+        $html .= '            <div class="form-check form-switch">';
+        $html .= '                <input class="form-check-input" type="checkbox" id="' . esc_attr($id) . '"' . $checked . '>';
+        $html .= '                <label class="form-check-label fw-semibold" for="' . esc_attr($id) . '">';
+        $html .= '                    ' . esc_html($label);
+        $html .= '                </label>';
+        $html .= '            </div>';
+        if (!empty($helpText)) {
+            $html .= '            <div class="form-text small">' . esc_html($helpText) . '</div>';
+        }
+        $html .= '        </div>';
+
+        return $html;
+    }
+
+    private function buildTextInput(string $id, string $label, mixed $value, string $helpText = ''): string
+    {
+        $value = is_string($value) ? $value : '';
+
+        $html = '        <div class="mb-3">';
+        $html .= '            <label for="' . esc_attr($id) . '" class="form-label small mb-1 fw-semibold">';
+        $html .= '                ' . esc_html($label);
+        $html .= '            </label>';
+        $html .= '            <input type="text" class="form-control form-control-sm" id="' . esc_attr($id) . '" value="' . esc_attr($value) . '">';
+        if (!empty($helpText)) {
+            $html .= '            <div class="form-text small">' . esc_html($helpText) . '</div>';
+        }
+        $html .= '        </div>';
+
+        return $html;
+    }
+
+    private function buildPasswordInput(string $id, string $label, mixed $value, string $helpText = ''): string
+    {
+        $value = is_string($value) ? $value : '';
+
+        $html = '        <div class="mb-3">';
+        $html .= '            <label for="' . esc_attr($id) . '" class="form-label small mb-1 fw-semibold">';
+        $html .= '                ' . esc_html($label);
+        $html .= '            </label>';
+        $html .= '            <div class="input-group input-group-sm">';
+        $html .= '                <input type="password" class="form-control form-control-sm" id="' . esc_attr($id) . '" value="' . esc_attr($value) . '">';
+        $html .= '                <button class="btn btn-outline-secondary" type="button" onclick="togglePasswordVisibility(\'' . esc_attr($id) . '\')">';
+        $html .= '                    <i class="bi bi-eye"></i>';
+        $html .= '                </button>';
+        $html .= '            </div>';
+        if (!empty($helpText)) {
+            $html .= '            <div class="form-text small">' . esc_html($helpText) . '</div>';
+        }
+        $html .= '        </div>';
+
+        return $html;
+    }
+
+    private function buildSelect(string $id, string $label, mixed $value, array $options, string $helpText = ''): string
+    {
+        $value = is_string($value) ? $value : '';
+
+        $html = '        <div class="mb-3">';
+        $html .= '            <label for="' . esc_attr($id) . '" class="form-label small mb-1 fw-semibold">';
+        $html .= '                ' . esc_html($label);
+        $html .= '            </label>';
+        $html .= '            <select class="form-select form-select-sm" id="' . esc_attr($id) . '">';
+        foreach ($options as $optionValue => $optionLabel) {
+            $selected = ($value === (string) $optionValue) ? ' selected' : '';
+            $html .= '                <option value="' . esc_attr($optionValue) . '"' . $selected . '>' . esc_html($optionLabel) . '</option>';
+        }
+        $html .= '            </select>';
+        if (!empty($helpText)) {
+            $html .= '            <div class="form-text small">' . esc_html($helpText) . '</div>';
+        }
+        $html .= '        </div>';
+
+        return $html;
+    }
+}

Admin/Shared/Infrastructure/FieldMapping/FieldMapperProvider.php

@@ -35,6 +35,7 @@ final class FieldMapperProvider
         'AdsensePlacement',
         'ArchiveHeader',
         'PostGrid',
+        'RecaptchaSettings',
     ];
 
     public function __construct(

Public/ContactForm/Infrastructure/Api/WordPress/ContactFormAjaxHandler.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace ROITheme\Public\ContactForm\Infrastructure\Api\WordPress;
 
 use ROITheme\Shared\Domain\Contracts\ComponentSettingsRepositoryInterface;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * ContactFormAjaxHandler - Procesa envios del formulario de contacto
@@ -12,6 +13,7 @@ use ROITheme\Shared\Domain\Contracts\ComponentSettingsRepositoryInterface;
  *
  * SEGURIDAD:
  * - Verifica nonce
+ * - reCAPTCHA v3 para proteccion anti-spam
  * - Webhook URL NUNCA se expone al cliente
  * - Webhook URL se obtiene de BD server-side
  * - Rate limiting basico
@@ -25,7 +27,8 @@ final class ContactFormAjaxHandler
     private const COMPONENT_NAME = 'contact-form';
 
     public function __construct(
-        private ComponentSettingsRepositoryInterface $settingsRepository
+        private ComponentSettingsRepositoryInterface $settingsRepository,
+        private ?RecaptchaValidationService $recaptchaService = null
     ) {}
 
     /**
@@ -52,7 +55,15 @@ final class ContactFormAjaxHandler
             return;
         }
 
-        // 2. Rate limiting basico (1 envio por IP cada 30 segundos)
+        // 2. Validar reCAPTCHA (si esta habilitado)
+        if (!$this->validateRecaptcha()) {
+            wp_send_json_error([
+                'message' => __('Verificacion de seguridad fallida. Por favor intenta de nuevo.', 'roi-theme')
+            ], 403);
+            return;
+        }
+
+        // 3. Rate limiting basico (1 envio por IP cada 30 segundos)
         if (!$this->checkRateLimit()) {
             wp_send_json_error([
                 'message' => __('Por favor espera un momento antes de enviar otro mensaje.', 'roi-theme')
@@ -60,7 +71,7 @@ final class ContactFormAjaxHandler
             return;
         }
 
-        // 3. Sanitizar y validar inputs
+        // 4. Sanitizar y validar inputs
         $formData = $this->sanitizeFormData($_POST);
         $validation = $this->validateFormData($formData);
 
@@ -72,7 +83,7 @@ final class ContactFormAjaxHandler
             return;
         }
 
-        // 4. Obtener configuracion del componente (incluye webhook URL)
+        // 5. Obtener configuracion del componente (incluye webhook URL)
         $settings = $this->settingsRepository->getComponentSettings(self::COMPONENT_NAME);
 
         if (empty($settings)) {
@@ -98,10 +109,10 @@ final class ContactFormAjaxHandler
             return;
         }
 
-        // 5. Preparar payload para webhook
+        // 6. Preparar payload para webhook
         $payload = $this->preparePayload($formData, $includePageUrl, $includeTimestamp);
 
-        // 6. Enviar a webhook
+        // 7. Enviar a webhook
         $result = $this->sendToWebhook($webhookUrl, $webhookMethod, $payload);
 
         if ($result['success']) {
@@ -300,4 +311,31 @@ final class ContactFormAjaxHandler
     {
         return $value === true || $value === '1' || $value === 1;
     }
+
+    /**
+     * Validar reCAPTCHA token
+     *
+     * @return bool True si pasa la validacion o si reCAPTCHA no esta habilitado
+     */
+    private function validateRecaptcha(): bool
+    {
+        // Si el servicio no esta inyectado, permitir
+        if ($this->recaptchaService === null) {
+            return true;
+        }
+
+        // Si reCAPTCHA no esta habilitado, permitir
+        if (!$this->recaptchaService->isRecaptchaEnabled()) {
+            return true;
+        }
+
+        // Obtener token del POST
+        $token = sanitize_text_field($_POST['recaptcha_token'] ?? '');
+
+        // Obtener accion configurada para contacto
+        $action = $this->recaptchaService->getContactAction();
+
+        // Validar con el servicio
+        return $this->recaptchaService->validateSubmission($token, $action);
+    }
 }

Public/ContactForm/Infrastructure/Ui/ContactFormRenderer.php

@@ -7,6 +7,7 @@ use ROITheme\Shared\Domain\Contracts\RendererInterface;
 use ROITheme\Shared\Domain\Contracts\CSSGeneratorInterface;
 use ROITheme\Shared\Domain\Entities\Component;
 use ROITheme\Shared\Infrastructure\Services\PageVisibilityHelper;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * ContactFormRenderer - Renderiza formulario de contacto con webhook
@@ -18,6 +19,7 @@ use ROITheme\Shared\Infrastructure\Services\PageVisibilityHelper;
  * - Envio a webhook configurable (no expuesto en frontend)
  * - Info de contacto configurable
  * - Mensajes de exito/error personalizables
+ * - reCAPTCHA v3 para proteccion anti-spam
  *
  * @package ROITheme\Public\ContactForm\Infrastructure\Ui
  */
@@ -26,7 +28,8 @@ final class ContactFormRenderer implements RendererInterface
     private const COMPONENT_NAME = 'contact-form';
 
     public function __construct(
-        private CSSGeneratorInterface $cssGenerator
+        private CSSGeneratorInterface $cssGenerator,
+        private ?RecaptchaValidationService $recaptchaService = null
     ) {}
 
     public function render(Component $component): string
@@ -49,8 +52,9 @@ final class ContactFormRenderer implements RendererInterface
         $css = $this->generateCSS($data);
         $html = $this->buildHTML($data, $visibilityClass);
         $js = $this->buildJS($data);
+        $recaptchaScript = $this->generateRecaptchaScript();
 
-        return sprintf("<style>%s</style>\n%s\n<script>%s</script>", $css, $html, $js);
+        return sprintf("<style>%s</style>\n%s\n<script>%s</script>\n%s", $css, $html, $js, $recaptchaScript);
     }
 
     /**
@@ -276,6 +280,7 @@ final class ContactFormRenderer implements RendererInterface
         // Right column - Form
         $html .= '<div class="col-lg-7">';
         $html .= sprintf('<form id="roiContactForm" data-nonce="%s">', esc_attr($nonce));
+        $html .= '<input type="hidden" name="recaptcha_token" id="contact-recaptcha-token" value="">';
         $html .= '<div class="row g-3">';
 
         // Full name field
@@ -400,17 +405,27 @@ final class ContactFormRenderer implements RendererInterface
         // AJAX URL for WordPress
         $ajaxUrl = admin_url('admin-ajax.php');
 
+        // Obtener configuracion reCAPTCHA
+        $recaptchaEnabled = $this->isRecaptchaEnabled();
+        $recaptchaSiteKey = $recaptchaEnabled ? esc_js($this->recaptchaService->getSiteKey()) : '';
+        $recaptchaAction = $recaptchaEnabled ? esc_js($this->recaptchaService->getContactAction()) : '';
+
         $js = <<<JS
 (function() {
     document.addEventListener('DOMContentLoaded', function() {
         const form = document.getElementById('roiContactForm');
         if (!form) return;
 
+        const recaptchaEnabled = {$this->boolToJs($recaptchaEnabled)};
+        const recaptchaSiteKey = '{$recaptchaSiteKey}';
+        const recaptchaAction = '{$recaptchaAction}';
+
         form.addEventListener('submit', async function(e) {
             e.preventDefault();
 
             const submitBtn = form.querySelector('button[type="submit"]');
             const messageDiv = document.getElementById('roiContactFormMessage');
+            const tokenInput = document.getElementById('contact-recaptcha-token');
             const originalBtnHtml = submitBtn.innerHTML;
             const nonce = form.dataset.nonce;
 
@@ -419,6 +434,18 @@ final class ContactFormRenderer implements RendererInterface
             submitBtn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>' + '{$sendingMessage}';
             messageDiv.style.display = 'none';
 
+            try {
+                // Ejecutar reCAPTCHA si esta habilitado
+                if (recaptchaEnabled && typeof grecaptcha !== 'undefined' && recaptchaSiteKey) {
+                    try {
+                        const token = await grecaptcha.execute(recaptchaSiteKey, { action: recaptchaAction });
+                        tokenInput.value = token;
+                    } catch (recaptchaError) {
+                        console.warn('reCAPTCHA error:', recaptchaError);
+                        // Continuar sin token (fail-open en backend)
+                    }
+                }
+
                 // Collect form data
                 const formData = new FormData(form);
                 formData.append('action', 'roi_contact_form_submit');
@@ -426,7 +453,6 @@ final class ContactFormRenderer implements RendererInterface
                 formData.append('pageUrl', window.location.href);
                 formData.append('pageTitle', document.title);
 
-            try {
                 const response = await fetch('{$ajaxUrl}', {
                     method: 'POST',
                     body: formData
@@ -600,6 +626,7 @@ JS;
         // Modal Body
         $html .= '<div class="modal-body">';
         $html .= sprintf('<form id="roiContactModalForm" data-nonce="%s">', esc_attr($nonce));
+        $html .= '<input type="hidden" name="recaptcha_token" id="modal-contact-recaptcha-token" value="">';
         $html .= '<div class="row g-3">';
 
         // Full name field
@@ -680,17 +707,27 @@ JS;
         // AJAX URL for WordPress
         $ajaxUrl = admin_url('admin-ajax.php');
 
+        // Obtener configuracion reCAPTCHA
+        $recaptchaEnabled = $this->isRecaptchaEnabled();
+        $recaptchaSiteKey = $recaptchaEnabled ? esc_js($this->recaptchaService->getSiteKey()) : '';
+        $recaptchaAction = $recaptchaEnabled ? esc_js($this->recaptchaService->getContactAction()) : '';
+
         $js = <<<JS
 (function() {
     document.addEventListener('DOMContentLoaded', function() {
         const form = document.getElementById('roiContactModalForm');
         if (!form) return;
 
+        const recaptchaEnabled = {$this->boolToJs($recaptchaEnabled)};
+        const recaptchaSiteKey = '{$recaptchaSiteKey}';
+        const recaptchaAction = '{$recaptchaAction}';
+
         form.addEventListener('submit', async function(e) {
             e.preventDefault();
 
             const submitBtn = form.querySelector('button[type="submit"]');
             const messageDiv = document.getElementById('roiContactModalMessage');
+            const tokenInput = document.getElementById('modal-contact-recaptcha-token');
             const originalBtnHtml = submitBtn.innerHTML;
             const nonce = form.dataset.nonce;
 
@@ -699,6 +736,18 @@ JS;
             submitBtn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>' + '{$sendingMessage}';
             messageDiv.style.display = 'none';
 
+            try {
+                // Ejecutar reCAPTCHA si esta habilitado
+                if (recaptchaEnabled && typeof grecaptcha !== 'undefined' && recaptchaSiteKey) {
+                    try {
+                        const token = await grecaptcha.execute(recaptchaSiteKey, { action: recaptchaAction });
+                        tokenInput.value = token;
+                    } catch (recaptchaError) {
+                        console.warn('reCAPTCHA error:', recaptchaError);
+                        // Continuar sin token (fail-open en backend)
+                    }
+                }
+
                 // Collect form data
                 const formData = new FormData(form);
                 formData.append('action', 'roi_contact_form_submit');
@@ -706,7 +755,6 @@ JS;
                 formData.append('pageUrl', window.location.href);
                 formData.append('pageTitle', document.title);
 
-            try {
                 const response = await fetch('{$ajaxUrl}', {
                     method: 'POST',
                     body: formData
@@ -761,4 +809,38 @@ JS;
 
         return $js;
     }
+
+    /**
+     * Genera el script de Google reCAPTCHA v3
+     */
+    private function generateRecaptchaScript(): string
+    {
+        if (!$this->isRecaptchaEnabled()) {
+            return '';
+        }
+
+        $siteKey = $this->recaptchaService->getSiteKey();
+        if (empty($siteKey)) {
+            return '';
+        }
+
+        $siteKey = esc_attr($siteKey);
+        return '<script src="https://www.google.com/recaptcha/api.js?render=' . $siteKey . '" async defer></script>';
+    }
+
+    /**
+     * Verifica si reCAPTCHA esta habilitado
+     */
+    private function isRecaptchaEnabled(): bool
+    {
+        return $this->recaptchaService !== null && $this->recaptchaService->isRecaptchaEnabled();
+    }
+
+    /**
+     * Convierte bool a string JavaScript
+     */
+    private function boolToJs(bool $value): string
+    {
+        return $value ? 'true' : 'false';
+    }
 }

Public/Footer/Infrastructure/Api/WordPress/NewsletterAjaxHandler.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace ROITheme\Public\Footer\Infrastructure\Api\WordPress;
 
 use ROITheme\Shared\Domain\Contracts\ComponentSettingsRepositoryInterface;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * NewsletterAjaxHandler - Procesa suscripciones al newsletter
@@ -12,6 +13,7 @@ use ROITheme\Shared\Domain\Contracts\ComponentSettingsRepositoryInterface;
  *
  * SEGURIDAD:
  * - Verifica nonce
+ * - reCAPTCHA v3 para proteccion anti-spam
  * - Webhook URL nunca se expone al cliente
  * - Rate limiting basico
  * - Sanitizacion de inputs
@@ -24,7 +26,8 @@ final class NewsletterAjaxHandler
     private const COMPONENT_NAME = 'footer';
 
     public function __construct(
-        private ComponentSettingsRepositoryInterface $settingsRepository
+        private ComponentSettingsRepositoryInterface $settingsRepository,
+        private ?RecaptchaValidationService $recaptchaService = null
     ) {}
 
     /**
@@ -50,7 +53,15 @@ final class NewsletterAjaxHandler
             return;
         }
 
-        // 2. Rate limiting (1 suscripcion por IP cada 60 segundos)
+        // 2. Validar reCAPTCHA (si esta habilitado)
+        if (!$this->validateRecaptcha()) {
+            wp_send_json_error([
+                'message' => __('Verificacion de seguridad fallida. Por favor intenta de nuevo.', 'roi-theme')
+            ], 403);
+            return;
+        }
+
+        // 3. Rate limiting (1 suscripcion por IP cada 60 segundos)
         if (!$this->checkRateLimit()) {
             wp_send_json_error([
                 'message' => __('Por favor espera un momento antes de intentar de nuevo.', 'roi-theme')
@@ -58,7 +69,7 @@ final class NewsletterAjaxHandler
             return;
         }
 
-        // 3. Validar y sanitizar campos
+        // 4. Validar y sanitizar campos
         $email = sanitize_email($_POST['email'] ?? '');
         $name = sanitize_text_field($_POST['name'] ?? '');
         $whatsapp = sanitize_text_field($_POST['whatsapp'] ?? '');
@@ -70,7 +81,7 @@ final class NewsletterAjaxHandler
             return;
         }
 
-        // 4. Obtener configuracion del componente
+        // 5. Obtener configuracion del componente
         $settings = $this->settingsRepository->getComponentSettings(self::COMPONENT_NAME);
 
         if (empty($settings)) {
@@ -94,7 +105,7 @@ final class NewsletterAjaxHandler
             return;
         }
 
-        // 5. Preparar payload
+        // 6. Preparar payload
         $payload = [
             'email' => $email,
             'name' => $name,
@@ -111,7 +122,7 @@ final class NewsletterAjaxHandler
         // Debug: Log payload enviado
         error_log('ROI Theme Newsletter: Enviando a webhook - ' . wp_json_encode($payload));
 
-        // 6. Enviar a webhook
+        // 7. Enviar a webhook
         $result = $this->sendToWebhook($webhookUrl, $payload);
 
         if ($result['success']) {
@@ -200,4 +211,31 @@ final class NewsletterAjaxHandler
 
         return $ip;
     }
+
+    /**
+     * Validar reCAPTCHA token
+     *
+     * @return bool True si pasa la validacion o si reCAPTCHA no esta habilitado
+     */
+    private function validateRecaptcha(): bool
+    {
+        // Si el servicio no esta inyectado, permitir
+        if ($this->recaptchaService === null) {
+            return true;
+        }
+
+        // Si reCAPTCHA no esta habilitado, permitir
+        if (!$this->recaptchaService->isRecaptchaEnabled()) {
+            return true;
+        }
+
+        // Obtener token del POST
+        $token = sanitize_text_field($_POST['recaptcha_token'] ?? '');
+
+        // Obtener accion configurada para newsletter
+        $action = $this->recaptchaService->getNewsletterAction();
+
+        // Validar con el servicio
+        return $this->recaptchaService->validateSubmission($token, $action);
+    }
 }

Public/Footer/Infrastructure/Ui/FooterRenderer.php

@@ -7,6 +7,7 @@ use ROITheme\Shared\Domain\Contracts\RendererInterface;
 use ROITheme\Shared\Domain\Contracts\CSSGeneratorInterface;
 use ROITheme\Shared\Domain\Entities\Component;
 use ROITheme\Shared\Infrastructure\Services\PageVisibilityHelper;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * FooterRenderer - Renderiza el footer del sitio
@@ -17,6 +18,7 @@ use ROITheme\Shared\Infrastructure\Services\PageVisibilityHelper;
  * - Webhook URL nunca se expone al cliente
  * - Escaping de todos los outputs
  * - Nonce para formulario newsletter
+ * - reCAPTCHA v3 para proteccion anti-spam
  *
  * @package ROITheme\Public\Footer\Infrastructure\Ui
  */
@@ -25,7 +27,8 @@ final class FooterRenderer implements RendererInterface
     private const NONCE_ACTION = 'roi_newsletter_nonce';
 
     public function __construct(
-        private CSSGeneratorInterface $cssGenerator
+        private CSSGeneratorInterface $cssGenerator,
+        private ?RecaptchaValidationService $recaptchaService = null
     ) {}
 
     public function supports(string $componentType): bool
@@ -65,7 +68,10 @@ final class FooterRenderer implements RendererInterface
         // Generar JavaScript
         $js = $this->generateJS($data);
 
-        return $css . $html . $js;
+        // Generar script reCAPTCHA (si esta habilitado)
+        $recaptchaScript = $this->generateRecaptchaScript();
+
+        return $css . $html . $js . $recaptchaScript;
     }
 
     private function generateCSS(array $data, bool $showDesktop, bool $showMobile): string
@@ -336,6 +342,7 @@ final class FooterRenderer implements RendererInterface
             $html .= '<form id="roi-newsletter-form" class="newsletter-form">';
             $html .= '<input type="hidden" name="action" value="roi_newsletter_subscribe">';
             $html .= '<input type="hidden" name="nonce" value="' . esc_attr($nonce) . '">';
+            $html .= '<input type="hidden" name="recaptcha_token" id="newsletter-recaptcha-token" value="">';
             $html .= '<input type="text" name="name" class="newsletter-input" placeholder="' . $newsletterNamePlaceholder . '">';
             $html .= '<input type="email" name="email" class="newsletter-input" placeholder="' . $newsletterEmailPlaceholder . '" required>';
             $html .= '<input type="tel" name="whatsapp" class="newsletter-input" placeholder="' . $newsletterWhatsappPlaceholder . '">';
@@ -382,18 +389,28 @@ final class FooterRenderer implements RendererInterface
 
         $ajaxUrl = admin_url('admin-ajax.php');
 
+        // Obtener configuracion reCAPTCHA
+        $recaptchaEnabled = $this->isRecaptchaEnabled();
+        $recaptchaSiteKey = $recaptchaEnabled ? esc_js($this->recaptchaService->getSiteKey()) : '';
+        $recaptchaAction = $recaptchaEnabled ? esc_js($this->recaptchaService->getNewsletterAction()) : '';
+
         $js = <<<JS
 <script>
 (function() {
     const form = document.getElementById('roi-newsletter-form');
     if (!form) return;
 
+    const recaptchaEnabled = {$this->boolToJs($recaptchaEnabled)};
+    const recaptchaSiteKey = '{$recaptchaSiteKey}';
+    const recaptchaAction = '{$recaptchaAction}';
+
     form.addEventListener('submit', async function(e) {
         e.preventDefault();
 
         const btn = form.querySelector('.newsletter-btn');
         const msgDiv = form.querySelector('.newsletter-message');
         const emailInput = form.querySelector('input[name="email"]');
+        const tokenInput = document.getElementById('newsletter-recaptcha-token');
         const originalText = btn.textContent;
 
         // Reset message
@@ -413,6 +430,17 @@ final class FooterRenderer implements RendererInterface
         btn.textContent = 'Enviando...';
 
         try {
+            // Ejecutar reCAPTCHA si esta habilitado
+            if (recaptchaEnabled && typeof grecaptcha !== 'undefined' && recaptchaSiteKey) {
+                try {
+                    const token = await grecaptcha.execute(recaptchaSiteKey, { action: recaptchaAction });
+                    tokenInput.value = token;
+                } catch (recaptchaError) {
+                    console.warn('reCAPTCHA error:', recaptchaError);
+                    // Continuar sin token (fail-open en backend)
+                }
+            }
+
             const formData = new FormData(form);
             formData.append('pageUrl', window.location.href);
             formData.append('pageTitle', document.title);
@@ -427,7 +455,7 @@ final class FooterRenderer implements RendererInterface
             if (result.success) {
                 msgDiv.textContent = '{$successMsg}';
                 msgDiv.classList.add('success');
-                emailInput.value = '';
+                form.reset();
             } else {
                 msgDiv.textContent = result.data?.message || '{$errorMsg}';
                 msgDiv.classList.add('error');
@@ -448,6 +476,40 @@ JS;
         return $js;
     }
 
+    /**
+     * Genera el script de Google reCAPTCHA v3
+     */
+    private function generateRecaptchaScript(): string
+    {
+        if (!$this->isRecaptchaEnabled()) {
+            return '';
+        }
+
+        $siteKey = $this->recaptchaService->getSiteKey();
+        if (empty($siteKey)) {
+            return '';
+        }
+
+        $siteKey = esc_attr($siteKey);
+        return '<script src="https://www.google.com/recaptcha/api.js?render=' . $siteKey . '" async defer></script>';
+    }
+
+    /**
+     * Verifica si reCAPTCHA esta habilitado
+     */
+    private function isRecaptchaEnabled(): bool
+    {
+        return $this->recaptchaService !== null && $this->recaptchaService->isRecaptchaEnabled();
+    }
+
+    /**
+     * Convierte bool a string JavaScript
+     */
+    private function boolToJs(bool $value): string
+    {
+        return $value ? 'true' : 'false';
+    }
+
     private function toBool($value): bool
     {
         return $value === true || $value === '1' || $value === 1;

Schemas/recaptcha-settings.json

@@ -0,0 +1,90 @@
+{
+  "component_name": "recaptcha-settings",
+  "version": "1.0.0",
+  "description": "Configuracion de Google reCAPTCHA v3 para proteccion anti-spam",
+  "groups": [
+    {
+      "name": "visibility",
+      "label": "Visibilidad",
+      "priority": 10,
+      "fields": [
+        {
+          "name": "is_enabled",
+          "label": "Habilitar reCAPTCHA",
+          "type": "boolean",
+          "default": false,
+          "description": "Activa la proteccion reCAPTCHA v3 en los formularios"
+        }
+      ]
+    },
+    {
+      "name": "credentials",
+      "label": "Credenciales",
+      "priority": 20,
+      "fields": [
+        {
+          "name": "site_key",
+          "label": "Site Key",
+          "type": "text",
+          "default": "",
+          "description": "Clave publica de reCAPTCHA v3 (visible en frontend)"
+        },
+        {
+          "name": "secret_key",
+          "label": "Secret Key",
+          "type": "text",
+          "default": "",
+          "description": "Clave secreta de reCAPTCHA v3 (solo backend, nunca exponer)"
+        }
+      ]
+    },
+    {
+      "name": "behavior",
+      "label": "Comportamiento",
+      "priority": 70,
+      "fields": [
+        {
+          "name": "score_threshold",
+          "label": "Umbral de Score",
+          "type": "select",
+          "default": "0.5",
+          "options": [
+            {"value": "0.3", "label": "0.3 - Permisivo (menos bloqueos)"},
+            {"value": "0.5", "label": "0.5 - Balanceado (recomendado)"},
+            {"value": "0.7", "label": "0.7 - Estricto"},
+            {"value": "0.9", "label": "0.9 - Muy estricto (mas bloqueos)"}
+          ],
+          "description": "Score minimo para considerar humano (0.0=bot, 1.0=humano)"
+        },
+        {
+          "name": "action_newsletter",
+          "label": "Accion Newsletter",
+          "type": "text",
+          "default": "newsletter_submit",
+          "description": "Nombre de accion para formulario newsletter"
+        },
+        {
+          "name": "action_contact",
+          "label": "Accion Contacto",
+          "type": "text",
+          "default": "contact_submit",
+          "description": "Nombre de accion para formulario de contacto"
+        },
+        {
+          "name": "fail_open",
+          "label": "Permitir en caso de fallo",
+          "type": "boolean",
+          "default": true,
+          "description": "Si la API de Google falla, permitir el envio (fail-open)"
+        },
+        {
+          "name": "log_blocked",
+          "label": "Registrar intentos bloqueados",
+          "type": "boolean",
+          "default": true,
+          "description": "Guardar log de intentos bloqueados por bajo score"
+        }
+      ]
+    }
+  ]
+}

Shared/Application/Services/RecaptchaValidationService.php

@@ -0,0 +1,249 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Application\Services;
+
+use ROITheme\Shared\Domain\Contracts\RecaptchaValidatorInterface;
+use ROITheme\Shared\Domain\Contracts\ComponentSettingsRepositoryInterface;
+use ROITheme\Shared\Domain\Entities\RecaptchaResult;
+
+/**
+ * RecaptchaValidationService - Servicio de aplicacion para validacion reCAPTCHA
+ *
+ * RESPONSABILIDAD: Orquestar la validacion de tokens reCAPTCHA v3,
+ * aplicando la configuracion del componente (threshold, fail-open, logging).
+ *
+ * DEPENDENCIAS (inyectadas via constructor):
+ * - RecaptchaValidatorInterface: Para validar tokens con API de Google
+ * - ComponentSettingsRepositoryInterface: Para obtener configuracion de BD
+ *
+ * USO:
+ * ```php
+ * $service = new RecaptchaValidationService($validator, $settingsRepo);
+ * $isValid = $service->validateSubmission($token, 'newsletter_submit');
+ * ```
+ *
+ * @package ROITheme\Shared\Application\Services
+ */
+final class RecaptchaValidationService
+{
+    private const COMPONENT_NAME = 'recaptcha-settings';
+
+    public function __construct(
+        private RecaptchaValidatorInterface $validator,
+        private ComponentSettingsRepositoryInterface $settingsRepository
+    ) {}
+
+    /**
+     * Validar un envio de formulario con reCAPTCHA
+     *
+     * @param string $token Token de reCAPTCHA del frontend
+     * @param string $action Accion a validar (ej: 'newsletter_submit')
+     * @return bool True si la validacion pasa, false si falla
+     */
+    public function validateSubmission(string $token, string $action): bool
+    {
+        $settings = $this->getSettings();
+
+        // Si reCAPTCHA esta deshabilitado, permitir siempre
+        if (!$this->isEnabled($settings)) {
+            return true;
+        }
+
+        // Validar que tengamos las credenciales
+        $secretKey = $this->getSecretKey($settings);
+        if (empty($secretKey)) {
+            $this->log('reCAPTCHA: Secret key no configurada, permitiendo envio');
+            return true;
+        }
+
+        // Si no hay token y fail-open esta habilitado, permitir
+        if (empty($token)) {
+            if ($this->isFailOpen($settings)) {
+                $this->log('reCAPTCHA: Token vacio, fail-open habilitado');
+                return true;
+            }
+            $this->logBlocked('Token vacio', 0.0, $action);
+            return false;
+        }
+
+        // Validar con API de Google
+        $result = $this->validator->validate($token, $action, $secretKey);
+
+        // Manejar errores de API
+        if (!$result->isSuccess()) {
+            if ($this->isFailOpen($settings)) {
+                $this->log('reCAPTCHA: API error, fail-open habilitado: ' . implode(', ', $result->getErrorCodes()));
+                return true;
+            }
+            $this->logBlocked('API error: ' . implode(', ', $result->getErrorCodes()), 0.0, $action);
+            return false;
+        }
+
+        // Verificar threshold
+        $threshold = $this->getThreshold($settings);
+        $isValid = $result->isValid($threshold);
+
+        if (!$isValid && $this->shouldLogBlocked($settings)) {
+            $this->logBlocked('Score bajo', $result->getScore(), $action, $threshold);
+        }
+
+        return $isValid;
+    }
+
+    /**
+     * Verificar si reCAPTCHA esta habilitado
+     *
+     * @return bool True si esta habilitado
+     */
+    public function isRecaptchaEnabled(): bool
+    {
+        return $this->isEnabled($this->getSettings());
+    }
+
+    /**
+     * Obtener el Site Key para uso en frontend
+     *
+     * @return string Site key o cadena vacia si no configurado
+     */
+    public function getSiteKey(): string
+    {
+        $settings = $this->getSettings();
+        return $settings['credentials']['site_key'] ?? '';
+    }
+
+    /**
+     * Obtener la accion configurada para newsletter
+     *
+     * @return string Nombre de la accion
+     */
+    public function getNewsletterAction(): string
+    {
+        $settings = $this->getSettings();
+        return $settings['behavior']['action_newsletter'] ?? 'newsletter_submit';
+    }
+
+    /**
+     * Obtener la accion configurada para contacto
+     *
+     * @return string Nombre de la accion
+     */
+    public function getContactAction(): string
+    {
+        $settings = $this->getSettings();
+        return $settings['behavior']['action_contact'] ?? 'contact_submit';
+    }
+
+    /**
+     * Obtener configuracion del componente
+     *
+     * @return array<string, mixed>
+     */
+    private function getSettings(): array
+    {
+        return $this->settingsRepository->getComponentSettings(self::COMPONENT_NAME);
+    }
+
+    /**
+     * Verificar si esta habilitado
+     *
+     * @param array<string, mixed> $settings
+     * @return bool
+     */
+    private function isEnabled(array $settings): bool
+    {
+        $isEnabled = $settings['visibility']['is_enabled'] ?? false;
+        return $isEnabled === true || $isEnabled === '1' || $isEnabled === 1;
+    }
+
+    /**
+     * Obtener secret key
+     *
+     * @param array<string, mixed> $settings
+     * @return string
+     */
+    private function getSecretKey(array $settings): string
+    {
+        return $settings['credentials']['secret_key'] ?? '';
+    }
+
+    /**
+     * Obtener threshold configurado
+     *
+     * @param array<string, mixed> $settings
+     * @return float
+     */
+    private function getThreshold(array $settings): float
+    {
+        $threshold = $settings['behavior']['score_threshold'] ?? '0.5';
+        return (float) $threshold;
+    }
+
+    /**
+     * Verificar si fail-open esta habilitado
+     *
+     * @param array<string, mixed> $settings
+     * @return bool
+     */
+    private function isFailOpen(array $settings): bool
+    {
+        $failOpen = $settings['behavior']['fail_open'] ?? true;
+        return $failOpen === true || $failOpen === '1' || $failOpen === 1;
+    }
+
+    /**
+     * Verificar si se debe loguear intentos bloqueados
+     *
+     * @param array<string, mixed> $settings
+     * @return bool
+     */
+    private function shouldLogBlocked(array $settings): bool
+    {
+        $logBlocked = $settings['behavior']['log_blocked'] ?? true;
+        return $logBlocked === true || $logBlocked === '1' || $logBlocked === 1;
+    }
+
+    /**
+     * Registrar mensaje en log
+     *
+     * @param string $message
+     */
+    private function log(string $message): void
+    {
+        error_log('ROI Theme ' . $message);
+    }
+
+    /**
+     * Registrar intento bloqueado
+     *
+     * @param string $reason Razon del bloqueo
+     * @param float $score Score obtenido
+     * @param string $action Accion intentada
+     * @param float|null $threshold Threshold configurado
+     */
+    private function logBlocked(string $reason, float $score, string $action, ?float $threshold = null): void
+    {
+        $ip = $this->getClientIP();
+        $thresholdStr = $threshold !== null ? ", threshold: {$threshold}" : '';
+        $this->log("reCAPTCHA BLOCKED: {$reason} | action: {$action} | score: {$score}{$thresholdStr} | IP: {$ip}");
+    }
+
+    /**
+     * Obtener IP del cliente (para logging)
+     *
+     * @return string
+     */
+    private function getClientIP(): string
+    {
+        if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
+            return sanitize_text_field($_SERVER['HTTP_CLIENT_IP']);
+        }
+        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+            return sanitize_text_field(explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])[0]);
+        }
+        if (!empty($_SERVER['REMOTE_ADDR'])) {
+            return sanitize_text_field($_SERVER['REMOTE_ADDR']);
+        }
+        return 'unknown';
+    }
+}

Shared/Domain/Contracts/RecaptchaValidatorInterface.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Domain\Contracts;
+
+use ROITheme\Shared\Domain\Entities\RecaptchaResult;
+
+/**
+ * RecaptchaValidatorInterface - Contrato para validacion de reCAPTCHA
+ *
+ * RESPONSABILIDAD: Definir el contrato para validar tokens de reCAPTCHA v3
+ * con la API de Google.
+ *
+ * PRINCIPIOS:
+ * - Interface Segregation: Una sola responsabilidad - validar tokens
+ * - Dependency Inversion: Depender de abstraccion, no de implementacion
+ *
+ * USO:
+ * ```php
+ * final class GoogleRecaptchaValidator implements RecaptchaValidatorInterface
+ * {
+ *     public function validate(string $token, string $action, string $secretKey): RecaptchaResult
+ *     {
+ *         // Llamar a API de Google y retornar resultado
+ *     }
+ * }
+ * ```
+ *
+ * @package ROITheme\Shared\Domain\Contracts
+ */
+interface RecaptchaValidatorInterface
+{
+    /**
+     * Validar un token de reCAPTCHA v3 con la API de Google
+     *
+     * @param string $token Token generado por reCAPTCHA en frontend
+     * @param string $action Nombre de la accion (ej: 'newsletter_submit', 'contact_submit')
+     * @param string $secretKey Clave secreta de reCAPTCHA
+     * @return RecaptchaResult Resultado de la validacion con score y estado
+     */
+    public function validate(string $token, string $action, string $secretKey): RecaptchaResult;
+}

Shared/Domain/Entities/RecaptchaResult.php

@@ -0,0 +1,134 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Domain\Entities;
+
+/**
+ * RecaptchaResult - Entidad que representa el resultado de validacion reCAPTCHA
+ *
+ * RESPONSABILIDAD: Encapsular el resultado de la validacion de reCAPTCHA v3
+ * incluyendo el score, estado de exito y posibles codigos de error.
+ *
+ * INMUTABILIDAD: Esta entidad es inmutable - una vez creada no puede modificarse.
+ *
+ * SCORE reCAPTCHA v3:
+ * - 1.0: Muy probablemente humano
+ * - 0.9: Probablemente humano
+ * - 0.5: Indeterminado
+ * - 0.1: Probablemente bot
+ * - 0.0: Muy probablemente bot
+ *
+ * @package ROITheme\Shared\Domain\Entities
+ */
+final class RecaptchaResult
+{
+    /**
+     * @param bool $success Si la validacion fue exitosa (token valido)
+     * @param float $score Score de 0.0 (bot) a 1.0 (humano)
+     * @param string $action Accion verificada
+     * @param array<string> $errorCodes Codigos de error de la API
+     * @param string $hostname Hostname donde se genero el token
+     * @param string $challengeTs Timestamp del challenge
+     */
+    public function __construct(
+        private bool $success,
+        private float $score,
+        private string $action,
+        private array $errorCodes = [],
+        private string $hostname = '',
+        private string $challengeTs = ''
+    ) {}
+
+    /**
+     * Verificar si el resultado es valido segun un threshold
+     *
+     * @param float $threshold Score minimo requerido (ej: 0.5)
+     * @return bool True si success=true Y score >= threshold
+     */
+    public function isValid(float $threshold): bool
+    {
+        return $this->success && $this->score >= $threshold;
+    }
+
+    /**
+     * Verificar si la accion coincide con la esperada
+     *
+     * @param string $expectedAction Accion esperada
+     * @return bool True si la accion coincide
+     */
+    public function hasValidAction(string $expectedAction): bool
+    {
+        return $this->action === $expectedAction;
+    }
+
+    public function isSuccess(): bool
+    {
+        return $this->success;
+    }
+
+    public function getScore(): float
+    {
+        return $this->score;
+    }
+
+    public function getAction(): string
+    {
+        return $this->action;
+    }
+
+    /**
+     * @return array<string>
+     */
+    public function getErrorCodes(): array
+    {
+        return $this->errorCodes;
+    }
+
+    public function hasErrors(): bool
+    {
+        return !empty($this->errorCodes);
+    }
+
+    public function getHostname(): string
+    {
+        return $this->hostname;
+    }
+
+    public function getChallengeTs(): string
+    {
+        return $this->challengeTs;
+    }
+
+    /**
+     * Crear resultado de fallo (para errores de red, timeout, etc.)
+     *
+     * @param array<string> $errorCodes Codigos de error
+     * @return self
+     */
+    public static function failure(array $errorCodes = ['unknown-error']): self
+    {
+        return new self(
+            success: false,
+            score: 0.0,
+            action: '',
+            errorCodes: $errorCodes
+        );
+    }
+
+    /**
+     * Convertir a array para logging
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(): array
+    {
+        return [
+            'success' => $this->success,
+            'score' => $this->score,
+            'action' => $this->action,
+            'error_codes' => $this->errorCodes,
+            'hostname' => $this->hostname,
+            'challenge_ts' => $this->challengeTs,
+        ];
+    }
+}

Shared/Infrastructure/Di/DIContainer.php

@@ -48,6 +48,10 @@ use ROITheme\Shared\Domain\Contracts\PostGridShortcodeRendererInterface;
 use ROITheme\Shared\Infrastructure\Query\PostGridQueryBuilder;
 use ROITheme\Shared\Infrastructure\Ui\PostGridShortcodeRenderer;
 use ROITheme\Shared\Application\UseCases\RenderPostGrid\RenderPostGridUseCase;
+// reCAPTCHA Anti-spam System
+use ROITheme\Shared\Domain\Contracts\RecaptchaValidatorInterface;
+use ROITheme\Shared\Infrastructure\Services\GoogleRecaptchaValidator;
+use ROITheme\Shared\Application\Services\RecaptchaValidationService;
 
 /**
  * DIContainer - Contenedor de Inyección de Dependencias
@@ -542,4 +546,35 @@ final class DIContainer
         }
         return $this->instances['renderPostGridUseCase'];
     }
+
+    // ===============================
+    // reCAPTCHA Anti-spam System
+    // ===============================
+
+    /**
+     * Obtiene el validador de reCAPTCHA (comunicacion con API de Google)
+     */
+    public function getRecaptchaValidator(): RecaptchaValidatorInterface
+    {
+        if (!isset($this->instances['recaptchaValidator'])) {
+            $this->instances['recaptchaValidator'] = new GoogleRecaptchaValidator();
+        }
+        return $this->instances['recaptchaValidator'];
+    }
+
+    /**
+     * Obtiene el servicio de validacion reCAPTCHA
+     *
+     * Orquesta la validacion usando configuracion de BD
+     */
+    public function getRecaptchaValidationService(): RecaptchaValidationService
+    {
+        if (!isset($this->instances['recaptchaValidationService'])) {
+            $this->instances['recaptchaValidationService'] = new RecaptchaValidationService(
+                $this->getRecaptchaValidator(),
+                $this->getComponentSettingsRepository()
+            );
+        }
+        return $this->instances['recaptchaValidationService'];
+    }
 }

Shared/Infrastructure/Services/GoogleRecaptchaValidator.php

@@ -0,0 +1,112 @@
+<?php
+declare(strict_types=1);
+
+namespace ROITheme\Shared\Infrastructure\Services;
+
+use ROITheme\Shared\Domain\Contracts\RecaptchaValidatorInterface;
+use ROITheme\Shared\Domain\Entities\RecaptchaResult;
+
+/**
+ * GoogleRecaptchaValidator - Implementacion de validacion reCAPTCHA con API de Google
+ *
+ * RESPONSABILIDAD: Comunicarse con la API de Google reCAPTCHA v3 para
+ * validar tokens y obtener scores.
+ *
+ * API ENDPOINT: https://www.google.com/recaptcha/api/siteverify
+ *
+ * RESPUESTA DE GOOGLE:
+ * ```json
+ * {
+ *   "success": true|false,
+ *   "score": 0.0-1.0,
+ *   "action": "string",
+ *   "challenge_ts": "timestamp",
+ *   "hostname": "string",
+ *   "error-codes": ["string"]
+ * }
+ * ```
+ *
+ * @package ROITheme\Shared\Infrastructure\Services
+ */
+final class GoogleRecaptchaValidator implements RecaptchaValidatorInterface
+{
+    private const API_URL = 'https://www.google.com/recaptcha/api/siteverify';
+    private const TIMEOUT_SECONDS = 5;
+
+    /**
+     * Validar token de reCAPTCHA v3 con API de Google
+     *
+     * @param string $token Token generado por reCAPTCHA en frontend
+     * @param string $action Accion esperada
+     * @param string $secretKey Clave secreta de reCAPTCHA
+     * @return RecaptchaResult Resultado de la validacion
+     */
+    public function validate(string $token, string $action, string $secretKey): RecaptchaResult
+    {
+        // Validar parametros
+        if (empty($token) || empty($secretKey)) {
+            return RecaptchaResult::failure(['missing-input-secret']);
+        }
+
+        // Preparar request
+        $response = wp_remote_post(self::API_URL, [
+            'timeout' => self::TIMEOUT_SECONDS,
+            'body' => [
+                'secret' => $secretKey,
+                'response' => $token,
+                'remoteip' => $this->getClientIP(),
+            ],
+        ]);
+
+        // Manejar error de conexion
+        if (is_wp_error($response)) {
+            error_log('ROI Theme reCAPTCHA API error: ' . $response->get_error_message());
+            return RecaptchaResult::failure(['connection-error']);
+        }
+
+        // Verificar codigo HTTP
+        $statusCode = wp_remote_retrieve_response_code($response);
+        if ($statusCode !== 200) {
+            error_log('ROI Theme reCAPTCHA API HTTP error: ' . $statusCode);
+            return RecaptchaResult::failure(['http-error-' . $statusCode]);
+        }
+
+        // Parsear respuesta JSON
+        $body = wp_remote_retrieve_body($response);
+        $data = json_decode($body, true);
+
+        if (json_last_error() !== JSON_ERROR_NONE || !is_array($data)) {
+            error_log('ROI Theme reCAPTCHA API invalid JSON: ' . $body);
+            return RecaptchaResult::failure(['invalid-json']);
+        }
+
+        // Construir resultado
+        return new RecaptchaResult(
+            success: (bool) ($data['success'] ?? false),
+            score: (float) ($data['score'] ?? 0.0),
+            action: (string) ($data['action'] ?? ''),
+            errorCodes: (array) ($data['error-codes'] ?? []),
+            hostname: (string) ($data['hostname'] ?? ''),
+            challengeTs: (string) ($data['challenge_ts'] ?? '')
+        );
+    }
+
+    /**
+     * Obtener IP del cliente
+     *
+     * @return string
+     */
+    private function getClientIP(): string
+    {
+        if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
+            return sanitize_text_field($_SERVER['HTTP_CLIENT_IP']);
+        }
+        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+            return sanitize_text_field(explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'])[0]);
+        }
+        if (!empty($_SERVER['REMOTE_ADDR'])) {
+            return sanitize_text_field($_SERVER['REMOTE_ADDR']);
+        }
+        return '';
+    }
+}

functions-addon.php

@@ -347,10 +347,22 @@ function roi_render_component(string $componentName): string {
                 $renderer = new \ROITheme\Public\RelatedPost\Infrastructure\Ui\RelatedPostRenderer($cssGenerator);
                 break;
             case 'contact-form':
-                $renderer = new \ROITheme\Public\ContactForm\Infrastructure\Ui\ContactFormRenderer($cssGenerator);
+                // Inyectar servicio reCAPTCHA para proteccion anti-spam
+                try {
+                    $recaptchaService = \ROITheme\Shared\Infrastructure\Di\DIContainer::getInstance()->getRecaptchaValidationService();
+                } catch (\Throwable $e) {
+                    $recaptchaService = null;
+                }
+                $renderer = new \ROITheme\Public\ContactForm\Infrastructure\Ui\ContactFormRenderer($cssGenerator, $recaptchaService);
                 break;
             case 'footer':
-                $renderer = new \ROITheme\Public\Footer\Infrastructure\Ui\FooterRenderer($cssGenerator);
+                // Inyectar servicio reCAPTCHA para proteccion anti-spam en newsletter
+                try {
+                    $recaptchaService = \ROITheme\Shared\Infrastructure\Di\DIContainer::getInstance()->getRecaptchaValidationService();
+                } catch (\Throwable $e) {
+                    $recaptchaService = null;
+                }
+                $renderer = new \ROITheme\Public\Footer\Infrastructure\Ui\FooterRenderer($cssGenerator, $recaptchaService);
                 break;
             case 'archive-header':
                 $renderer = new \ROITheme\Public\ArchiveHeader\Infrastructure\Ui\ArchiveHeaderRenderer($cssGenerator);

functions.php

@@ -143,15 +143,20 @@ try {
     );
     $adminAjaxHandler->register();
 
+    // Obtener servicio de validacion reCAPTCHA para inyectar en handlers
+    $recaptchaService = $container->getRecaptchaValidationService();
+
     // Crear y registrar el handler AJAX para el Contact Form (público)
     $contactFormAjaxHandler = new \ROITheme\Public\ContactForm\Infrastructure\Api\WordPress\ContactFormAjaxHandler(
-        $container->getComponentSettingsRepository()
+        $container->getComponentSettingsRepository(),
+        $recaptchaService
     );
     $contactFormAjaxHandler->register();
 
     // Crear y registrar el handler AJAX para Newsletter (público)
     $newsletterAjaxHandler = new \ROITheme\Public\Footer\Infrastructure\Api\WordPress\NewsletterAjaxHandler(
-        $container->getComponentSettingsRepository()
+        $container->getComponentSettingsRepository(),
+        $recaptchaService
     );
     $newsletterAjaxHandler->register();
 
@@ -295,9 +300,10 @@ add_action('wp_footer', function() use ($container) {
             visibility: \ROITheme\Shared\Domain\ValueObjects\ComponentVisibility::allDevices()
         );
 
-        // Crear renderer y renderizar modal
+        // Crear renderer y renderizar modal (con soporte reCAPTCHA)
         $cssGenerator = new \ROITheme\Shared\Infrastructure\Services\CSSGeneratorService();
-        $renderer = new \ROITheme\Public\ContactForm\Infrastructure\Ui\ContactFormRenderer($cssGenerator);
+        $recaptchaService = $container->getRecaptchaValidationService();
+        $renderer = new \ROITheme\Public\ContactForm\Infrastructure\Ui\ContactFormRenderer($cssGenerator, $recaptchaService);
 
         // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
         echo $renderer->renderModal($component);