function wpcf7_captcha_validation_filter($result, $tag)
{
    $tag = new WPCF7_Shortcode($tag);
    $type = $tag->type;
    $name = $tag->name;
    $captchac = '_wpcf7_captcha_challenge_' . $name;
    $prefix = isset($_POST[$captchac]) ? (string) $_POST[$captchac] : '';
    $response = isset($_POST[$name]) ? (string) $_POST[$name] : '';
    $response = wpcf7_canonicalize($response);
    if (0 == strlen($prefix) || !wpcf7_check_captcha($prefix, $response)) {
        $result->invalidate($tag, wpcf7_get_message('captcha_not_match'));
    }
    if (0 != strlen($prefix)) {
        wpcf7_remove_captcha($prefix);
    }
    return $result;
}

function wpcf7_quiz_ajax_refill($items)
{
    if (!is_array($items)) {
        return $items;
    }
    $fes = wpcf7_scan_shortcode(array('type' => 'quiz'));
    if (empty($fes)) {
        return $items;
    }
    $refill = array();
    foreach ($fes as $fe) {
        $name = $fe['name'];
        $pipes = $fe['pipes'];
        if (empty($name)) {
            continue;
        }
        if (is_a($pipes, 'WPCF7_Pipes') && !$pipes->zero()) {
            $pipe = $pipes->random_pipe();
            $question = $pipe->before;
            $answer = $pipe->after;
        } else {
            // default quiz
            $question = '1+1=?';
            $answer = '2';
        }
        $answer = wpcf7_canonicalize($answer);
        $refill[$name] = array($question, wp_hash($answer, 'wpcf7_quiz'));
    }
    if (!empty($refill)) {
        $items['quiz'] = $refill;
    }
    return $items;
}

function wpcf7_file_validation_filter($result, $tag)
{
    $tag = new WPCF7_Shortcode($tag);
    $name = $tag->name;
    $id = $tag->get_id_option();
    $file = isset($_FILES[$name]) ? $_FILES[$name] : null;
    if ($file['error'] && UPLOAD_ERR_NO_FILE != $file['error']) {
        $result->invalidate($tag, wpcf7_get_message('upload_failed_php_error'));
        return $result;
    }
    if (empty($file['tmp_name']) && $tag->is_required()) {
        $result->invalidate($tag, wpcf7_get_message('invalid_required'));
        return $result;
    }
    if (!is_uploaded_file($file['tmp_name'])) {
        return $result;
    }
    $allowed_file_types = array();
    if ($file_types_a = $tag->get_option('filetypes')) {
        foreach ($file_types_a as $file_types) {
            $file_types = explode('|', $file_types);
            foreach ($file_types as $file_type) {
                $file_type = trim($file_type, '.');
                $file_type = str_replace(array('.', '+', '*', '?'), array('\\.', '\\+', '\\*', '\\?'), $file_type);
                $allowed_file_types[] = $file_type;
            }
        }
    }
    $allowed_file_types = array_unique($allowed_file_types);
    $file_type_pattern = implode('|', $allowed_file_types);
    $allowed_size = 1048576;
    // default size 1 MB
    if ($file_size_a = $tag->get_option('limit')) {
        $limit_pattern = '/^([1-9][0-9]*)([kKmM]?[bB])?$/';
        foreach ($file_size_a as $file_size) {
            if (preg_match($limit_pattern, $file_size, $matches)) {
                $allowed_size = (int) $matches[1];
                if (!empty($matches[2])) {
                    $kbmb = strtolower($matches[2]);
                    if ('kb' == $kbmb) {
                        $allowed_size *= 1024;
                    } elseif ('mb' == $kbmb) {
                        $allowed_size *= 1024 * 1024;
                    }
                }
                break;
            }
        }
    }
    /* File type validation */
    // Default file-type restriction
    if ('' == $file_type_pattern) {
        $file_type_pattern = 'jpg|jpeg|png|gif|pdf|doc|docx|ppt|pptx|odt|avi|ogg|m4a|mov|mp3|mp4|mpg|wav|wmv';
    }
    $file_type_pattern = trim($file_type_pattern, '|');
    $file_type_pattern = '(' . $file_type_pattern . ')';
    $file_type_pattern = '/\\.' . $file_type_pattern . '$/i';
    if (!preg_match($file_type_pattern, $file['name'])) {
        $result->invalidate($tag, wpcf7_get_message('upload_file_type_invalid'));
        return $result;
    }
    /* File size validation */
    if ($file['size'] > $allowed_size) {
        $result->invalidate($tag, wpcf7_get_message('upload_file_too_large'));
        return $result;
    }
    wpcf7_init_uploads();
    // Confirm upload dir
    $uploads_dir = wpcf7_upload_tmp_dir();
    $uploads_dir = wpcf7_maybe_add_random_dir($uploads_dir);
    $filename = $file['name'];
    $filename = wpcf7_canonicalize($filename);
    $filename = sanitize_file_name($filename);
    $filename = wpcf7_antiscript_file_name($filename);
    $filename = wp_unique_filename($uploads_dir, $filename);
    $new_file = trailingslashit($uploads_dir) . $filename;
    if (false === @move_uploaded_file($file['tmp_name'], $new_file)) {
        $result->invalidate($tag, wpcf7_get_message('upload_failed'));
        return $result;
    }
    // Make sure the uploaded file is only readable for the owner process
    @chmod($new_file, 0400);
    if ($submission = WPCF7_Submission::get_instance()) {
        $submission->add_uploaded_file($name, $new_file);
    }
    return $result;
}

function cf7bs_quiz_shortcode_handler($tag)
{
    $tag = new WPCF7_Shortcode($tag);
    if (empty($tag->name)) {
        return '';
    }
    $status = 'default';
    $validation_error = wpcf7_get_validation_error($tag->name);
    $class = wpcf7_form_controls_class($tag->type);
    if ($validation_error) {
        $class .= ' wpcf7-not-valid';
        $status = 'error';
    }
    // size is not used since Bootstrap input fields always scale 100%
    //$atts['size'] = $tag->get_size_option( '40' );
    $pipes = $tag->pipes;
    if (is_a($pipes, 'WPCF7_Pipes') && !$pipes->zero()) {
        $pipe = $pipes->random_pipe();
        $question = $pipe->before;
        $answer = $pipe->after;
    } else {
        // default quiz
        $question = '1+1=?';
        $answer = '2';
    }
    $answer = wpcf7_canonicalize($answer);
    $field = new CF7BS_Form_Field(cf7bs_apply_field_args_filter(array('name' => $tag->name, 'id' => $tag->get_option('id', 'id', true), 'class' => $tag->get_class_option($class), 'type' => 'text', 'value' => '', 'placeholder' => '', 'label' => $tag->content, 'help_text' => $validation_error, 'size' => cf7bs_get_form_property('size'), 'grid_columns' => cf7bs_get_form_property('grid_columns'), 'form_layout' => cf7bs_get_form_property('layout'), 'form_label_width' => cf7bs_get_form_property('label_width'), 'form_breakpoint' => cf7bs_get_form_property('breakpoint'), 'status' => $status, 'maxlength' => $tag->get_maxlength_option(), 'tabindex' => $tag->get_option('tabindex', 'int', true), 'wrapper_class' => $tag->name), $tag->basetype, $tag->name));
    $html = $field->display(false);
    $hidden_html = sprintf('<input type="hidden" name="_wpcf7_quiz_answer_%1$s" value="%2$s">', $tag->name, wp_hash($answer, 'wpcf7_quiz'));
    return str_replace('<input', '<p class="wpcf7-quiz-label">' . esc_html($question) . '</p>' . $hidden_html . '<input', $html);
}