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<?php |
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namespace FluentForm\App\Modules\Form; |
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|
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defined('ABSPATH') or die; |
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|
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use FluentForm\App\Helpers\Helper; |
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use FluentForm\App\Helpers\Protector; |
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use FluentForm\Framework\Helpers\ArrayHelper as Arr; |
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|
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class TokenBasedSpamProtection |
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{ |
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|
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public function __construct($app) |
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{ |
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if (!$this->isEnabled()) { |
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return; |
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} |
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|
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$app->addAction('wp_ajax_fluentform_generate_protection_token', [$this, 'ajaxGenerateToken']); |
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$app->addAction('wp_ajax_nopriv_fluentform_generate_protection_token', [$this, 'ajaxGenerateToken']); |
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|
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add_filter('fluentform/global_form_vars', function ($vars){ |
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$vars['token_nonce'] = wp_create_nonce('fluentform_generate_token_nonce'); |
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return $vars; |
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}); |
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|
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} |
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|
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public function renderTokenField($form) |
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{ |
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if (!$this->isEnabled($form->id)) { |
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return; |
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} |
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|
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$fieldName = $this->getFieldName($form->id); |
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?> |
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<input type="hidden" id="<?php echo esc_attr($fieldName); ?>" class="fluent-form-token-field" name="<?php echo esc_attr($fieldName); ?>"> |
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<?php |
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} |
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|
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public function ajaxGenerateToken() |
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{ |
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// phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verified on next line |
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$nonce = sanitize_text_field(Arr::get($_POST, 'nonce')); |
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// phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verified on next line |
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$formId = (int)Arr::get($_POST,'form_id'); |
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|
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$nonceVerified = wp_verify_nonce($nonce, 'fluentform_generate_token_nonce'); |
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if (!$formId || !$nonceVerified) { |
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wp_send_json_error([ |
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'message' => __('Invalid request', 'fluentform') |
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]); |
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} |
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|
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$token = $this->generateToken($formId); |
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$response = apply_filters('fluentform/token_based_protection_response', [ |
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'token' => $token |
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], $formId); |
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|
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wp_send_json_success($response); |
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} |
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|
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private function generateToken($formId) |
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{ |
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$timeStamp = current_time('timestamp'); |
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$fieldName = $this->getFieldName($formId); |
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$data = implode('|', [$timeStamp, $formId, $fieldName]); |
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|
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return apply_filters('fluentform/generated_protection_token', Protector::encrypt($data), $formId, $timeStamp); |
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} |
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|
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public function verify($insertData, $requestData, $formId) |
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{ |
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if ( |
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!$this->isEnabled($formId) || |
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( |
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Helper::isConversionForm($formId) && |
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Arr::isTrue($requestData, 'isFFConversational') |
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) |
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) { |
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return; |
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} |
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|
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$fieldName = $this->getFieldName($formId); |
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$token = sanitize_text_field(Arr::get($requestData, $fieldName)); |
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if (!$token || !$this->validateToken($token, $formId)) { |
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$errorMessage = apply_filters( |
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'fluentform/token_based_validation_error_message', |
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__('Suspicious activity detected. Form submission blocked', 'fluentform'), |
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$formId |
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); |
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|
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$this->handleSpam($errorMessage); |
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} |
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} |
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|
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private function validateToken($token, $formId) |
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{ |
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try { |
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|
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$decrypted = Protector::decrypt($token); |
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if (!$decrypted) { |
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return false; |
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} |
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|
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$parts = explode('|', $decrypted); |
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if (count($parts) !== 3) { |
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return false; |
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} |
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|
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[$timestamp, $tokenFormId, $fieldName] = $parts; |
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|
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// Ensure all components are valid |
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if (!is_numeric($timestamp) || !is_numeric($tokenFormId)) { |
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return false; |
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} |
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|
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$expirationTime = apply_filters('fluentform/token_expiration_time', 3600, $formId); //1 hour |
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if ($timestamp + $expirationTime < current_time('timestamp')) { |
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return false; |
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} |
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|
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$isValid = (int)$tokenFormId === $formId && $fieldName === $this->getFieldName($formId); |
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return apply_filters('fluentform/token_based_validation_result', |
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$isValid, |
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$timestamp, |
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$tokenFormId, |
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$formId); |
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|
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} catch (\Exception $e) { |
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return false; |
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} |
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} |
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|
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|
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private function handleSpam($reason) |
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{ |
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do_action('fluentform/spam_attempt_caught', $reason); |
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|
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wp_send_json([ |
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'errors' => $reason |
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], 422); |
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} |
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|
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public function isEnabled($formId = false) |
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{ |
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$option = get_option('_fluentform_global_form_settings'); |
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$status = 'yes' === Arr::get($option, 'misc.tokenBasedProtectionStatus'); |
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return apply_filters('fluentform/token_based_spam_protection_status', $status, $formId); |
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} |
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|
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private function getFieldName($formId) |
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{ |
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$tokenInputName = '__fluent_protection_token_'. $formId; |
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return apply_filters('fluentform/token_protection_name', $tokenInputName, $formId); |
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} |
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} |
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|
