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<?php

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namespace Smush\Core;

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class Server_Utils {

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const FIREFOX_AGENT = '#Firefox/(?<version>[0-9]{2,})#i';

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const IPAD_IPHONE_AGENT = '#(?:iPad|iPhone)(.*)Version/(?<version>[0-9]{2,})#i';

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const SAFARI_AGENT = '#Version/(?<version>[0-9]{2,})(?:.*)Safari#i';

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const MSIE_TRIDENT = '/MSIE|Trident/i';

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/**

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* @var string

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private $mysql_version;

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private $browser_webp_support = array(

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self::FIREFOX_AGENT => array( 'version' => 66, 'operator' => '>' ),

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self::IPAD_IPHONE_AGENT => array( 'version' => 14, 'operator' => '>=' ),

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self::SAFARI_AGENT => array( 'version' => 14, 'operator' => '>=' ),

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self::MSIE_TRIDENT => false,

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);

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public function get_server_type() {

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if ( empty( $_SERVER['SERVER_SOFTWARE'] ) ) {

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return '';

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}

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$server_software = wp_unslash( $_SERVER['SERVER_SOFTWARE'] );

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if ( ! is_array( $server_software ) ) {

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$server_software = array( $server_software );

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}

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$server_software = array_map( 'strtolower', $server_software );

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$is_nginx = $this->array_has_needle( $server_software, 'nginx' );

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if ( $is_nginx ) {

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return 'nginx';

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}

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$is_apache = $this->array_has_needle( $server_software, 'apache' );

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if ( $is_apache ) {

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return 'apache';

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}

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return '';

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}

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public function get_memory_limit() {

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if ( function_exists( 'ini_get' ) ) {

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$memory_limit = ini_get( 'memory_limit' );

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} else {

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// Sensible default.

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$memory_limit = '128M';

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}

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if ( ! $memory_limit || - 1 === (int) $memory_limit ) {

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// Unlimited, set to 32GB.

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$memory_limit = '32000M';

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}

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return intval( $memory_limit ) * 1024 * 1024;

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}

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public function get_memory_usage() {

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return memory_get_usage( true );

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}

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private function array_has_needle( $array, $needle ) {

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foreach ( $array as $item ) {

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if ( strpos( $item, $needle ) !== false ) {

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return true;

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}

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}

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return false;

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}

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public function get_mysql_version() {

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if ( ! $this->mysql_version ) {

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global $wpdb;

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/**

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* MariaDB version prefix 5.5.5- is not stripped when using $wpdb->db_version() to get the DB version:

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* https://github.com/php/php-src/issues/7972

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$this->mysql_version = $wpdb->get_var( 'SELECT VERSION()' );

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}

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return $this->mysql_version;

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}

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public function get_max_execution_time() {

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return (int) ini_get( 'max_execution_time' );

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}

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public function get_user_agent() {

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return ! empty( $_SERVER['HTTP_USER_AGENT'] ) ? wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) : '';

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}

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public function get_document_root() {

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return ! empty( $_SERVER['DOCUMENT_ROOT'] ) ? wp_unslash( $_SERVER['DOCUMENT_ROOT'] ) : '';

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}

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public function get_http_accept_header() {

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if ( ! empty( $_SERVER['HTTP_ACCEPT'] ) ) {

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return wp_unslash( $_SERVER['HTTP_ACCEPT'] );

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}

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if ( function_exists( 'apache_request_headers' ) ) {

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$headers = apache_request_headers();

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if ( ! empty( $headers['Accept'] ) ) {

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return $headers['Accept'];

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}

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}

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return '';

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}

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public function browser_supports_webp() {

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$http_accept = $this->get_http_accept_header();

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if ( ! empty( $http_accept ) && false !== strpos( $http_accept, 'webp' ) ) {

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return true;

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}

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return $this->check_user_agent_version( $this->browser_webp_support );

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}

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private function check_user_agent_version( $allowed, $default = false ) {

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$user_agent = $this->get_user_agent();

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foreach ( $allowed as $user_agenet_regex => $data ) {

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$version = isset( $data['version'] ) ? $data['version'] : 0;

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$operator = isset( $data['operator'] ) ? $data['operator'] : '';

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$matches = array();

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if ( preg_match( $user_agenet_regex, $user_agent, $matches ) ) {

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if ( $version && $operator && $matches['version'] ) {

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return version_compare( (int) $matches['version'], $version, $operator );

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} else {

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return $data;

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}

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}

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}

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return $default;

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}

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public function get_request_uri() {

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return rawurldecode( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) );

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}

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public function get_current_url() {

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$protocol = is_ssl() ? 'https:' : 'http:';

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$domain = parse_url( site_url(), PHP_URL_HOST );

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$path = parse_url( $this->get_request_uri(), PHP_URL_PATH );

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return $protocol . '//' . $domain . $path;

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}

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public function get_request_method() {

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if ( empty( $_SERVER['REQUEST_METHOD'] ) ) {

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return '';

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}

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return strtoupper( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) );

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}

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}

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