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<?php
if (!defined('WPO_VERSION')) die('No direct access allowed');
if (!class_exists('WPO_WebP_Self_Test')) :
class WPO_WebP_Self_Test {
/**
* Determines whether content type header has webp mime or not
*
* @param array $headers An array of headers
*
* @return bool
*/
private function has_webp_mime($headers) {
return isset($headers['content-type']) && 0 === strcasecmp('image/webp', $headers['content-type']);
}
/**
* Determines whether headers has `vary` header or not
*
* @param array $headers An array of headers
*
* @return bool
*/
private function has_vary($headers) {
return isset($headers['vary']) && preg_match('/accept/i', $headers['vary']);
}
/**
* 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';
$response = wp_remote_head($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 = $headers->getAll();
if ($this->has_webp_mime($headers) && $this->has_vary($headers)) {
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;