File: //var/www/linde/wp-content/themes/linde/functions.php
<?php
/**
 * Timber starter-theme
 * https://github.com/timber/starter-theme
 *
 * @package  WordPress
 * @subpackage  Timber
 * @since   Timber 0.1
 */
define('THEMEROOT', get_stylesheet_directory_uri() . "/");
define('FILEROOT', dirname(__DIR__) . '/' . get_option('stylesheet'));
/**
 * If you are installing Timber as a Composer dependency in your theme, you'll need this block
 * to load your dependencies and initialize Timber. If you are using Timber via the WordPress.org
 * plug-in, you can safely delete this block.
 */
$composer_autoload = __DIR__ . '/vendor/autoload.php';
if ( file_exists( $composer_autoload ) ) {
	require_once $composer_autoload;
	$timber = new Timber\Timber();
}
/**
 * This ensures that Timber is loaded and available as a PHP class.
 * If not, it gives an error message to help direct developers on where to activate
 */
if ( ! class_exists( 'Timber' ) ) {
	add_action(
		'admin_notices',
		function() {
			echo '<div class="error"><p>Timber not activated. Make sure you activate the plugin in <a href="' . esc_url( admin_url( 'plugins.php#timber' ) ) . '">' . esc_url( admin_url( 'plugins.php' ) ) . '</a></p></div>';
		}
	);
	add_filter(
		'template_include',
		function( $template ) {
			return get_stylesheet_directory() . '/static/no-timber.html';
		}
	);
	return;
}
add_filter('wpcf7_form_elements', 'contact_form_remove_checkbox_wrapping' );
function contact_form_remove_checkbox_wrapping( $content ) {
    preg_match_all('/<span class="wpcf7-form-control-wrap[a-zA-Z ]*"><span class="wpcf7-form-control wpcf7-[checkbox|radio]+" id="([^\"]+)"><span class="[^\"]+">(<input type="[checkbox|radio]+" name="[^\"]+" value="[^\"]*" \/>)<span class="wpcf7-list-item-label">[^\"]+<\/span><\/span><\/span><\/span>/i', $content, $out );
    if ( !empty( $out[0] ) ) {
        $count = count( $out[1] );
        for ( $i = 0; $i<$count; $i++ ) {
            $out[2][ $i ] = str_replace(' value=', 'id="' . $out[1][ $i ] . '" value=', $out[2][$i] );
        }
        return str_replace( $out[0], $out[2], $content );
    }
    return $content;
}
/**
 * Sets the directories (inside your theme) to find .twig attachments
 */
Timber::$dirname = array( 'templates', 'views' );
/**
 * By default, Timber does NOT autoescape values. Want to enable Twig's autoescape?
 * No prob! Just set this value to true
 */
Timber::$autoescape = false;
/**
 * We're going to configure our theme inside of a subclass of Timber\Site
 * You can move this to its own file and include here via php's include("MySite.php")
 */
class LindeSite extends Timber\Site {
	/** Add timber support. */
	public function __construct() {
		add_action( 'after_setup_theme', array( $this, 'setup_menus' ) );
        add_action( 'init', array( $this, 'setup_image_sizes' ) );
        add_action( 'after_setup_theme', array( $this, 'theme_supports' ) );
		add_filter( 'timber/context', array( $this, 'add_to_context' ) );
		add_filter( 'timber/twig', array( $this, 'add_to_twig' ) );
		add_action( 'wp_head', array( $this, 'linde_scripts_function' ) );
		parent::__construct();
	}
	public function add_to_context( $context ) {
		$context['menu']  = array();
        $context['menu']['main'] = new Timber\Menu('primary');
        $context['menu']['footer'] = new Timber\Menu('footer');
        $context['footer_text'] = get_field('footer_text', 'option');
        $context['footer_tagline'] = get_field('footer_tagline', 'option');
        $context['social_icons'] = get_field('social_icons', 'option');
        $context['general_form'] = get_field('cta_form_contact_form_7_code', 'option');
        $context['modules_subtitle_text'] = get_field('modules_subtitle_text', 'option');
        $context['contact_form_text'] = get_field('contact_form_text', 'option');
        $context['ganalytics'] = get_field('google_analytics_tracking_ID', 'option');        
        $context['data_protection_page_link'] = get_permalink(get_field('data_protection_page', 'option'));
        $context['terms_page_link'] = get_permalink(get_field('terms_page', 'option'));
        $context['success_stories_page_link'] = get_permalink(get_field('success_stories_page', 'option'));
        $context['thank_you_page_link'] = get_permalink(get_field('thank_you_page_link', 'option'));
		$context['site']  = $this;
		return $context;
	}
	public function setup_menus(){
        register_nav_menus( array (
            'primary' => __( 'Primary menu', 'linde' ),
            'footer' => __( 'Footer menu', 'linde' )
        ) );
    }
    public function setup_image_sizes(){
        add_image_size( "19x6_large", "1920", "600", true );
        add_image_size( "19x10_large", "1920", "1072", true );
        add_image_size( "19x10_medium_plus", "824", "460", true );
        add_image_size( "19x10_medium", "412", "230", true );
        add_image_size( "19x10_small", "206", "115", true );
        add_image_size( "19x4_large", "1920", "400", true );
        add_image_size( "53x32", "532", "299", true );
        add_image_size( "72x68_large", "720", "668", true );
        add_image_size( "72x60_large", "720", "600", true );
        add_image_size( "72x68_medium", "360", "334", true );
        add_image_size( "72x60_medium", "360", "300", true );
        add_image_size( "82x46_large", "824", "460", true );
        add_image_size( "82x46_medium", "412", "230", true );
        add_image_size( "82x46_small", "225", "126", true );
    }
	public function theme_supports() {
		  
		
		// Make linde available for translation. Translations can be added to the /languages/ directory.
		 load_theme_textdomain( 'trex', get_template_directory() . '/languages' );
		 
		/*
		 * Let WordPress manage the document title.
		 * By adding theme support, we declare that this theme does not use a
		 * hard-coded <title> tag in the document head, and expect WordPress to
		 * provide it for us.
		 */
		add_theme_support( 'title-tag' );
		/*
		 * Enable support for Post Thumbnails on posts and pages.
		 *
		 * @link https://developer.wordpress.org/themes/functionality/featured-images-post-thumbnails/
		 */
		add_theme_support( 'post-thumbnails' );
		/*
		 * Switch default core markup for search form, comment form, and comments
		 * to output valid HTML5.
		 */
		add_theme_support(
			'html5',
			array(
				'comment-form',
				'comment-list',
				'gallery',
				'caption',
			)
		);
		/*
		 * Enable support for Post Formats.
		 *
		 * See: https://codex.wordpress.org/Post_Formats
		 */
		add_theme_support(
			'post-formats',
			array(
				'aside',
				'image',
				'video',
				'quote',
				'link',
				'gallery',
				'audio',
			)
		);
	}
	function linde_scripts_function() {
		$html = '<script type="text/javascript">';
		$html .= 'var ajaxurl = "' . admin_url('admin-ajax.php') . '";';
		$html .= 'var themeurl = "' . get_template_directory_uri() . '";';
		$html .= 'var siteurl = "' . get_site_url() . '";';
		$html .= '</script>';
	  
		echo $html;
		
	}
	
	/** This is where you can add your own functions to twig.
	 *
	 * @param string $twig get extension.
	 */
	public function add_to_twig( $twig ) {
		$twig->addExtension( new Twig\Extension\StringLoaderExtension() );
        $twig->addFilter( new Timber\Twig_Filter( 'format_session', 'format_session' ) );
		return $twig;
	}
}
function format_session( $text ) {
    return sprintf("%02d", $text);
    return $text;
}
class ModuleTerm extends Timber\Term{
    var $_coverImage = null;
    var $_coverImageMobile = null;
    var $_featuredImage = null;
    public function coverImage() {
        if (!$this->_coverImage) {
            if ( isset( $this->cover_image ) && strlen( $this->cover_image ) ) {
                $this->_coverImage = new Timber\Image( $this->cover_image );
            }
        }
        if (!$this->_coverImage) {
            $this->_coverImage = new Timber\Image( get_field('module_cover_image_default', 'option') );
        }
        return $this->_coverImage;
    }
    public function featuredImage() {
        if (!$this->_featuredImage) {
            if ( isset( $this->thumbnail_image ) && strlen( $this->thumbnail_image ) ) {
                $this->_featuredImage = new Timber\Image( $this->thumbnail_image );
            }
        }
        if (!$this->_featuredImage) {
            $this->_featuredImage = new Timber\Image( get_field('module_featured_image_default', 'option') );
        }
        return $this->_featuredImage;
    }
    public function coverImageMobile() {
        if (!$this->_coverImageMobile) {
            if ( isset( $this->cover_image_mobile) && strlen( $this->cover_image_mobile ) ) {
                $this->_coverImageMobile = new Timber\Image( $this->cover_image_mobile );
            }
        }
        if (!$this->_coverImageMobile) {
            $this->_coverImageMobile = new Timber\Image( get_field('module_cover_image_mobile_default', 'option') );
        }
        return $this->_coverImageMobile;
    }
}
class PostCourse extends Timber\Post {
    var $_coverImage = null;
    var $_coverImageMobile = null;
    var $_featuredImage = null;
    public function coverImage() {
        if (!$this->_coverImage) {
            if ( isset( $this->cover_image ) && strlen( $this->cover_image ) ) {
                $this->_coverImage = new Timber\Image( $this->cover_image );
            }
        }
        if (!$this->_coverImage) {
            $this->_coverImage = new Timber\Image( get_field('module_cover_image_default', 'option') );
        }
        return $this->_coverImage;
    }
    public function featuredImage() {
        if (!$this->_featuredImage) {
            if ( $this->thumbnail()) {
                $this->_featuredImage = $this->thumbnail();
            }
        }
        if (!$this->_featuredImage) {
            $this->_featuredImage = new Timber\Image( get_field('course_featured_image_default', 'option') );
        }
        return $this->_featuredImage;
    }
    
    public function coverImageMobile() {
        if (!$this->_coverImageMobile) {
            if ( isset( $this->cover_image_mobile) && strlen( $this->cover_image_mobile ) ) {
                $this->_coverImageMobile = new Timber\Image( $this->cover_image_mobile );
            }
        }
        if (!$this->_coverImageMobile) {
            $this->_coverImageMobile = new Timber\Image( get_field('module_cover_image_mobile_default', 'option') );
        }
        return $this->_coverImageMobile;
    }
}
class PostFlexible extends Timber\Post {
    public function blocks() {
        $blocks = array();
        foreach ( $this->meta( 'sections' ) as $section ) {
            $elements = array();
            foreach ( $section["elements"] as $element ) {
                include 'templates/page-elements/' . $element['acf_fc_layout'] . '.php';
                $elements[] = $element;
            }
            $section["elements"] = $elements;
            $blocks[] = $section;
        }
        return $blocks;
    }
}
new LindeSite();
//send the captcha token from the FE to this method, will return true if everything is valid, or false if captcha check fails
function check_captcha($token){
        // Google reCAPTCHA secret key
        $secretKey = '6Lc_PDYqAAAAAA76ccPpBk-ds8WLokYSPSPpEp7b';
        // Verify the token with Google reCAPTCHA
        $verifyUrl = 'https://www.google.com/recaptcha/api/siteverify';
        $response = wp_remote_post($verifyUrl, [
              'body' => [
                    'secret' => $secretKey,
                    'response' => $token,
                    'remoteip' => $_SERVER['REMOTE_ADDR']
                ]
        ]);
        $responseBody = wp_remote_retrieve_body($response);
        $result = json_decode($responseBody);
        if (!$result->success || $result->score < 0.5) {
            return false;
        }else{
            return true;
        }
}
/** Contact Form AJAX */  
add_action('wp_ajax_post_contact_form', 'post_contact_form');
add_action('wp_ajax_nopriv_post_contact_form', 'post_contact_form');
function post_contact_form() {
    // The captcha token from the request
    $token = isset($_POST['token']) ? sanitize_text_field($_POST['token']) : '';  
    $is_captcha_success = check_captcha($token);
    if($is_captcha_success){
        // Failure
        wp_send_json_success(['result' => 'error', 'msg' => "There was an error trying to send your message."]);  
        return; // Stop further execution
    }
   $form_data = isset($_POST['data']) ? sanitize_text_field($_POST['data']) : '';
    try {
        $result = post('https://www.engineering.linde.com/l/310981/2020-03-31/lkl868', $form_data);
        wp_send_json_success(['result' => 'success', 'msg' => "Thank you for reaching out! We'll get back to you soon!", 'resultMsg'=> $result, 'form_data' => $form_data]);
    } catch (Exception $e) { // POST request failed   
        wp_send_json_success(['result' => 'error', 'msg' => "There was an error trying to send your message. Please try again."]);  
    }
}
  
/** Newsletter Form AJAX */
add_action('wp_ajax_post_newsletter_form', 'post_newsletter_form');
add_action('wp_ajax_nopriv_post_newsletter_form', 'post_newsletter_form');
function post_newsletter_form() {
    // The captcha token from the request
    $token = isset($_POST['token']) ? sanitize_text_field($_POST['token']) : '';
  
    $is_captcha_success = check_captcha($token);
    if($is_captcha_success){
        // Failure
        wp_send_json_success(['result' => 'error', 'msg' => "There was an error trying to process your request."]);  
        return; // Stop further execution
    }
  $form_data = isset($_POST['data']) ? sanitize_text_field($_POST['data']) : '';
  try {
    $result = post('https://www.engineering.linde.com/l/310981/2021-09-22/2kf3p7z', $form_data);
    wp_send_json_success(['result' => 'success', 'msg' => "You have successfully subscribed to our newsletter.", 'resultMsg'=> $result, 'form_data' => $form_data]);
    exit();
  } catch (Exception $e) { // POST request failed
    wp_send_json_success(['result' => 'error', 'msg' => "This email address has already subscribed."]);
  }
  wp_die(); 
}
/** Generic POST r quest helper for ajax form */
function post($url, $postStr = array()){
  $options = array(
    'http' =>
        array(
            'method'  => 'POST',
            'header'  => 'Content-type: application/x-www-form-urlencoded',
            'content' => $postStr
        )
  );
  $streamContext  = stream_context_create($options);    
  $result = file_get_contents($url, false, $streamContext);
  if($result === false){
      $error = error_get_last();
      throw new Exception('POST request failed: ' . $error['message']);
  }
  return $result;
}