first commit

wp-content/plugins/wp-optimize/webp/class-wpo-webp-self-test.php

@@ -0,0 +1,85 @@
+<?php
+
+if (!defined('WPO_VERSION')) die('No direct access allowed');
+
+if (!class_exists('WPO_WebP_Self_Test')) :
+
+class WPO_WebP_Self_Test {
+
+	/**
+	 * Decided whether we can get a webp image or not
+	 *
+	 * @return bool
+	 */
+	public function get_webp_image() {
+		$args = array(
+			'headers' => array(
+				'accept' => 'image/webp'
+			)
+		);
+
+		$upload_dir = wp_upload_dir();
+		$url =  $upload_dir['baseurl']. '/wpo/images/wpo_logo_small.png.webp';
+
+		$response = wp_remote_get($url, $args);
+
+		if (is_wp_error($response)) return false;
+		if (200 != $response['response']['code']) return false;
+
+		$headers = wp_remote_retrieve_headers($response);
+		if (method_exists($headers, 'getAll')) {
+			$headers = $headers->getAll();
+			if (isset($headers['content-type']) && 'image/webp' == $headers['content-type']) {
+				return true;
+			}
+		}
+		
+		return false;
+	}
+
+	/**
+	 * Decided whether webp version is served or not
+	 *
+	 * @return bool
+	 */
+	public function is_webp_served() {
+		$args = array(
+			'headers' => array(
+				'accept' => 'image/webp'
+			)
+		);
+
+		$upload_dir = wp_upload_dir();
+		$url =  $upload_dir['baseurl']. '/wpo/images/wpo_logo_small.png';
+
+		$response = wp_remote_get($url, $args);
+
+		if (is_wp_error($response)) return false;
+		if (200 != $response['response']['code']) return false;
+
+		$headers = wp_remote_retrieve_headers($response);
+		if (method_exists($headers, 'getAll')) {
+			$headers = $headers->getAll();
+			if (isset($headers['content-type']) && 'image/webp' == $headers['content-type']) {
+				return true;
+			}
+		}
+		
+		return false;
+	}
+
+	/**
+	 * Returns singleton instance
+	 *
+	 * @return WPO_WebP_Self_Test
+	 */
+	public static function get_instance() {
+		static $_instance = null;
+		if (null === $_instance) {
+			$_instance = new self();
+		}
+		return $_instance;
+	}
+}
+
+endif;