im( $body ) ) { return $parsed_body; } } } /** * Determines whether an HTTP API request to the given URL should be blocked. * * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will * prevent plugins from working and core functionality, if you don't include `api.wordpress.org`. * * You block external URL requests by defining `WP_HTTP_BLOCK_EXTERNAL` as true in your `wp-config.php` * file and this will only allow localhost and your site to make requests. The constant * `WP_ACCESSIBLE_HOSTS` will allow additional hosts to go through for requests. The format of the * `WP_ACCESSIBLE_HOSTS` constant is a comma separated list of hostnames to allow, wildcard domains * are supported, eg `*.wordpress.org` will allow for all subdomains of `wordpress.org` to be contacted. * * @since 2.8.0 * * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests. * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS * * @param string $uri URI of url. * @return bool True to block, false to allow. */ public function block_request( $uri ) { // We don't need to block requests, because nothing is blocked. if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL ) { return false; } $check = parse_url( $uri ); if ( ! $check ) { return true; } $home = parse_url( get_option( 'siteurl' ) ); // Don't block requests back to ourselves by default. if ( 'localhost' === $check['host'] || ( isset( $home['host'] ) && $home['host'] === $check['host'] ) ) { /** * Filters whether to block local HTTP API requests. * * A local request is one to `localhost` or to the same host as the site itself. * * @since 2.8.0 * * @param bool $block Whether to block local requests. Default false. */ return apply_filters( 'block_local_requests', false ); } if ( ! defined( 'WP_ACCESSIBLE_HOSTS' ) ) { return true; } static $accessible_hosts = null; static $wildcard_regex = array(); if ( null === $accessible_hosts ) { $accessible_hosts = preg_split( '|,\s*|', WP_ACCESSIBLE_HOSTS ); if ( str_contains( WP_ACCESSIBLE_HOSTS, '*' ) ) { $wildcard_regex = array(); foreach ( $accessible_hosts as $host ) { $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) ); } $wildcard_regex = '/^(' . implode( '|', $wildcard_regex ) . ')$/i'; } } if ( ! empty( $wildcard_regex ) ) { return ! preg_match( $wildcard_regex, $check['host'] ); } else { return ! in_array( $check['host'], $accessible_hosts, true ); // Inverse logic, if it's in the array, then don't block it. } } /** * Used as a wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7. * * @deprecated 4.4.0 Use wp_parse_url() * @see wp_parse_url() * * @param string $url The URL to parse. * @return bool|array False on failure; Array of URL components on success; * See parse_url()'s return values. */ protected static function parse_url( $url ) { _deprecated_function( __METHOD__, '4.4.0', 'wp_parse_url()' ); return wp_parse_url( $url ); } /** * Converts a relative URL to an absolute URL relative to a given URL. * * If an Absolute URL is provided, no processing of that URL is done. * * @since 3.4.0 * * @param string $maybe_relative_path The URL which might be relative. * @param string $url The URL which $maybe_relative_path is relative to. * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned. */ public static function make_absolute_url( $maybe_relative_path, $url ) { if ( empty( $url ) ) { return $maybe_relative_path; } $url_parts = wp_parse_url( $url ); if ( ! $url_parts ) { return $maybe_relative_path; } $relative_url_parts = wp_parse_url( $maybe_relative_path ); if ( ! $relative_url_parts ) { return $maybe_relative_path; } // Check for a scheme on the 'relative' URL. if ( ! empty( $relative_url_parts['scheme'] ) ) { return $maybe_relative_path; } $absolute_path = $url_parts['scheme'] . '://'; // Schemeless URLs will make it this far, so we check for a host in the relative URL // and convert it to a protocol-URL. if ( isset( $relative_url_parts['host'] ) ) { $absolute_path .= $relative_url_parts['host']; if ( isset( $relative_url_parts['port'] ) ) { $absolute_path .= ':' . $relative_url_parts['port']; } } else { $absolute_path .= $url_parts['host']; if ( isset( $url_parts['port'] ) ) { $absolute_path .= ':' . $url_parts['port']; } } // Start off with the absolute URL path. $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/'; // If it's a root-relative path, then great. if ( ! empty( $relative_url_parts['path'] ) && '/' === $relative_url_parts['path'][0] ) { $path = $relative_url_parts['path']; // Else it's a relative path. } elseif ( ! empty( $relative_url_parts['path'] ) ) { // Strip off any file components from the absolute path. $path = substr( $path, 0, strrpos( $path, '/' ) + 1 ); // Build the new path. $path .= $relative_url_parts['path']; // Strip all /path/../ out of the path. while ( strpos( $path, '../' ) > 1 ) { $path = preg_replace( '![^/]+/\.\./!', '', $path ); } // Strip any final leading ../ from the path. $path = preg_replace( '!^/(\.\./)+!', '', $path ); } // Add the query string. if ( ! empty( $relative_url_parts['query'] ) ) { $path .= '?' . $relative_url_parts['query']; } // Add the fragment. if ( ! empty( $relative_url_parts['fragment'] ) ) { $path .= '#' . $relative_url_parts['fragment']; } return $absolute_path . '/' . ltrim( $path, '/' ); } /** * Handles an HTTP redirect and follows it if appropriate. * * @since 3.7.0 * * @param string $url The URL which was requested. * @param array $args The arguments which were used to make the request. * @param array $response The response of the HTTP request. * @return array|false|WP_Error An HTTP API response array if the redirect is successfully followed, * false if no redirect is present, or a WP_Error object if there's an error. */ public static function handle_redirects( $url, $args, $response ) { // If no redirects are present, or, redirects were not requested, perform no action. if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] ) { return false; } // Only perform redirections on redirection http codes. if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 ) { return false; } // Don't redirect if we've run out of redirects. if ( $args['redirection']-- <= 0 ) { return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) ); } $redirect_location = $response['headers']['location']; // If there were multiple Location headers, use the last header specified. if ( is_array( $redirect_location ) ) { $redirect_location = array_pop( $redirect_location ); } $redirect_location = WP_Http::make_absolute_url( $redirect_location, $url ); // POST requests should not POST to a redirected location. if ( 'POST' === $args['method'] ) { if ( in_array( $response['response']['code'], array( 302, 303 ), true ) ) { $args['method'] = 'GET'; } } // Include valid cookies in the redirect process. if ( ! empty( $response['cookies'] ) ) { foreach ( $response['cookies'] as $cookie ) { if ( $cookie->test( $redirect_location ) ) { $args['cookies'][] = $cookie; } } } return wp_remote_request( $redirect_location, $args ); } /** * Determines if a specified string represents an IP address or not. * * This function also detects the type of the IP address, returning either * '4' or '6' to represent an IPv4 and IPv6 address respectively. * This does not verify if the IP is a valid IP, only that it appears to be * an IP address. * * @link http://home.deds.nl/~aeron/regex/ for IPv6 regex. * * @since 3.7.0 * * @param string $maybe_ip A suspected IP address. * @return int|false Upon success, '4' or '6' to represent an IPv4 or IPv6 address, false upon failure. */ public static function is_ip_address( $maybe_ip ) { if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) { return 4; } if ( str_contains( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) { return 6; } return false; } }