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Edit File: varnish.php

<?php
	class VarnishWPFC{

public static function purge_cache($data = false) {
			if(isset($GLOBALS["wpfc_varnish_purge_cache_executed"])){
				return;
			}else{
				$GLOBALS["wpfc_varnish_purge_cache_executed"] = true;
			}

if(gettype($data) == "array"){
				// Clearing page cache action sends the data as Array
				if(isset($data["status"]) && $data["status"] == "pause"){
					return array("success" => true);
				}

$server = $data["server"];
			}else{
				// Ajax request and save() function send the data as string
				$server = $data;
			}

$home = get_option('home');
			$host = preg_replace("/(https?\:\/\/)(.+)/", "$2", $home);
			$host = preg_replace("/\/.*/", "", $host);

$schema = preg_replace("/(https?\:\/\/).+/", "$1", $home);
			$schema = strtolower($schema);

$ssl_verification = $schema == 'https://' ? true : false;

$request_url = $schema.$server."/.*";

$request_args = array(
				'method'    => "PURGE",
				'headers'   => array(
					'Host'       => $host,
					'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36',
				),
				'sslverify' => $ssl_verification,
			);

$response = wp_remote_request($request_url, $request_args );

if(is_wp_error( $response ) || $response['response']['code'] != '200'){

if($schema === 'https://'){
					$request_url = str_replace("https://", "http://", $request_url);
				}else{
					$request_url = str_replace("http://", "https://", $request_url);
				}

$response = wp_remote_request($request_url, $request_args );

if(is_wp_error( $response ) || $response['response']['code'] != '200'){

if($response->get_error_messages()){
						return array("success" => "", "message" => $response->get_error_message());

}

if($response['response']['code'] == "501"){
						$text = '"Purge" method is not allowed';

if(isset($response['headers']['allow'])){
							$text = $text.". The allowed methods are ".$response['headers']['allow'];
							$text = $text.". Please contact your hosting provider";
						}

return array("success" => "", "message" => $text);
					}

}
			}

return array("success" => true);
		}

public static function save(){
			if(!wp_verify_nonce($_POST["security"], 'wpfc-varnish-ajax-nonce')){
				die( 'Security check' );
			}

$_POST["server"] = sanitize_text_field($_POST["server"]);

$purce_res = self::purge_cache($_POST["server"]);

if(!$purce_res["success"]){
				wp_send_json($purce_res);
			}

$datas = get_option("WpFastestCacheVarnish");

if(!is_array($datas)){
				$datas = array();
				$datas["server"] = $_POST["server"];

add_option("WpFastestCacheVarnish", $datas, 1, "yes");
			}else{
				$datas["server"] = $_POST["server"];

update_option("WpFastestCacheVarnish", $datas, 1, "yes");
			}

wp_send_json_success();

}

public static function status(){
			$datas = get_option("WpFastestCacheVarnish");

if(is_array($datas)){
				if(isset($datas["status"]) && $datas["status"] == "pause"){
					echo "isConnected pause";
				}else{
					echo "isConnected";
				}
			}
		}

public static function start(){
			if(!wp_verify_nonce($_POST["security"], 'wpfc-varnish-ajax-nonce')){
				die( 'Security check' );
			}

$datas = get_option("WpFastestCacheVarnish");

if(is_array($datas)){
				unset($datas["status"]);

$purce_res = self::purge_cache($datas);

if(!$purce_res["success"]){
					wp_send_json($purce_res);
				}

update_option("WpFastestCacheVarnish", $datas, 1, "yes");
			}

wp_send_json_success();
		}

public static function pause(){
			if(!wp_verify_nonce($_POST["security"], 'wpfc-varnish-ajax-nonce')){
				die( 'Security check' );
			}

$datas = get_option("WpFastestCacheVarnish");

if(is_array($datas)){
				$datas["status"] = "pause";
				update_option("WpFastestCacheVarnish", $datas, 1, "yes");
			}

wp_send_json_success();
		}

public static function remove(){
			if(!wp_verify_nonce($_POST["security"], 'wpfc-varnish-ajax-nonce')){
				die( 'Security check' );
			}

delete_option("WpFastestCacheVarnish");

wp_send_json_success();
		}

}

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