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wp-content/plugins/shortpixel-image-optimiser/class/external/offload/Offloader.php

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+<?php
+namespace ShortPixel\External\Offload;
+use ShortPixel\ShortPixelLogger\ShortPixelLogger as Log;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+// Class to check what offloader to use and load it. To offload.
+class Offloader
+{
+		private static $instance;
+		private static $offload_instance;
+		private $offloadName;
+
+		public static function getInstance()
+		{
+			 if (is_null(self::$instance))
+			 {
+				  self::$instance = new Offloader();
+			 }
+
+			 return self::$instance;
+		}
+
+		public function __construct()
+		{
+			  add_action('plugins_loaded', array($this, 'load'));
+				add_action('as3cf_init', array($this, 'initS3Offload'));
+		}
+
+		public function load()
+		{
+				$bool = $this->checkVirtualLoaders();
+				if (true === $bool)
+				{
+ 						self::$offload_instance = new VirtualFileSystem($this->offloadName);
+				}
+
+		}
+
+		protected function checkVirtualLoaders()
+		{
+			 	if ( class_exists('\Stack\Config') ) // Bitpoke Stack MU
+				{
+						$this->offloadName = 'stack';
+						return true;
+				}
+				elseif (defined('STACK_MEDIA_BUCKET'))
+				{
+						$this->offloadName = 'stack';
+						return true;
+				}
+				elseif (class_exists('\S3_Uploads\Plugin'))
+				{
+					 $this->offloadName = 's3-uploads-human';
+					 return true;
+				}
+/* (Doesn't work)
+				elseif (function_exists('ud_check_stateless_media'))
+				{
+					 $this->offloadName = 'wp-stateless';
+					 return true;
+				} */
+				return false;
+		}
+
+		// If As3cfInit is called check WpOffload runtime. This is later in order than plugins_loaded!
+		public function initS3Offload($as3cf)
+		{
+					if (is_null(self::$offload_instance))
+					{
+							$this->offloadName = 'wp-offload';
+						  self::$offload_instance = new wpOffload($as3cf);
+					}
+					else {
+						  Log::addError('Instance is not null - other virtual component has loaded! (' . $this->offloadName . ')');
+					}
+		}
+
+		public function getOffloadName()
+		{
+			 return $this->offloadName;
+		}
+
+}
+
+Offloader::getInstance(); // init