OwlCyberSecurity - MANAGER

Edit File: class-page-templater.php

<?php
class SHWCPPageTemplater {

/**
	 * A Unique Identifier
	 */
	 protected $plugin_slug;

/**
	 * A reference to an instance of this class.
	 */
	private static $instance;

/**
	 * The array of templates that this plugin tracks.
	 */
	protected $templates;

/**
	 * Returns an instance of this class. 
	 */
	public static function get_instance() {

if( null == self::$instance ) {
			self::$instance = new SHWCPPageTemplater();
		}

return self::$instance;

}

/**
	 * Initializes the plugin by setting filters and administration functions.
	 */
	private function __construct() {

$this->templates = array();

// Add a filter to the attributes metabox to inject template into the cache.
		if ( version_compare( floatval($GLOBALS['wp_version']), '4.7', '<' ) ) { // 4.6 and older
			add_filter(
				'page_attributes_dropdown_pages_args',
				array( $this, 'register_project_templates' ) 
			);
		} else { // Add a filter to the wp 4.7 version attributes metabox
			add_filter(
				'theme_page_templates', array( $this, 'add_new_template' )
			);
		}
		// Add a filter to the attributes metabox to inject template into the cache.
		add_filter(
			'page_attributes_dropdown_pages_args',
			 array( $this, 'register_project_templates' ) 
		);

// Add a filter to the save post to inject out template into the page cache
		add_filter(
			'wp_insert_post_data', 
			array( $this, 'register_project_templates' ) 
		);

// Add a filter to the template include to determine if the page has our 
		// template assigned and return it's path
		add_filter(
			'template_include', 
			array( $this, 'view_project_template') 
		);

// Add your templates to this array.
		$this->templates = array(
			'wcp-fullpage-template.php'		=> 'WP Contacts Template',
		);
			
	}

/**
	 * Adds our template to the page dropdown for v4.7+
	 *
	 **/
	public function add_new_template( $posts_templates ) {
		$posts_templates = array_merge( $posts_templates, $this->templates );
		return $posts_templates;
	}

/**
	 * Adds our template to the pages cache in order to trick WordPress
	 * into thinking the template file exists where it doens't really exist.
	 *
	 */

public function register_project_templates( $atts ) {

// Create the key used for the themes cache
		$cache_key = 'page_templates-' . md5( get_theme_root() . '/' . get_stylesheet() );

// Retrieve the cache list. 
		// If it doesn't exist, or it's empty prepare an array
		$templates = wp_get_theme()->get_page_templates();
		if ( empty( $templates ) ) {
				$templates = array();
		}

// New cache, therefore remove the old one
		wp_cache_delete( $cache_key , 'themes');

// Now add our template to the list of templates by merging our templates
		// with the existing templates array from the cache.
		$templates = array_merge( $templates, $this->templates );

// Add the modified cache to allow WordPress to pick it up for listing
		// available templates
		wp_cache_add( $cache_key, $templates, 'themes', 1800 );

return $atts;

}

/**
	 * Checks if the template is assigned to the page
	 */
	public function view_project_template( $template ) {

global $post;
		$post_id = isset($post->ID) ? $post->ID : '';

if (!isset($this->templates[get_post_meta( 
			$post_id, '_wp_page_template', true 
		)] ) ) {
				
				return $template;
					
		}

$file = plugin_dir_path(__FILE__). get_post_meta( 
			$post_id, '_wp_page_template', true 
		);
			
		// Just to be safe, we check if the file exist first
		if( file_exists( $file ) ) {
			return $file;
		} 
		else { echo $file; }

return $template;

}

add_action( 'plugins_loaded', array( 'SHWCPPageTemplater', 'get_instance' ) );