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<?php
/**
* HTTP API: WP_HTTP_Proxy class
*
* @package WordPress
* @subpackage HTTP
* @since 4.4.0
*/
/**
* Core class used to implement HTTP API proxy support.
*
* There are caveats to proxy support. It requires that defines be made in the wp-config.php file to
* enable proxy support. There are also a few filters that plugins can hook into for some of the
* constants.
*
* Please note that only BASIC authentication is supported by most transports.
* cURL MAY support more methods (such as NTLM authentication) depending on your environment.
*
* The constants are as follows:
* <ol>
* <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li>
* <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li>
* <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li>
* <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li>
* <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy.
* You do not need to have localhost and the site host in this list, because they will not be passed
* through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org</li>
* </ol>
*
* An example can be as seen below.
*
* define('WP_PROXY_HOST', '192.168.84.101');
* define('WP_PROXY_PORT', '8080');
* define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org');
*
* @link https://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.
* @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS
*
* @since 2.8.0
*/
class WP_HTTP_Proxy {
/**
* Whether proxy connection should be used.
*
* @since 2.8.0
*
* @use WP_PROXY_HOST
* @use WP_PROXY_PORT
*
* @return bool
*/
public function is_enabled() {
return defined( 'WP_PROXY_HOST' ) && defined( 'WP_PROXY_PORT' );
}
/**
* Whether authentication should be used.
*
* @since 2.8.0
*
* @use WP_PROXY_USERNAME
* @use WP_PROXY_PASSWORD
*
* @return bool
*/
public function use_authentication() {
return defined( 'WP_PROXY_USERNAME' ) && defined( 'WP_PROXY_PASSWORD' );
}
/**
* Retrieve the host for the proxy server.
*
* @since 2.8.0
*
* @return string
*/
public function host() {
if ( defined( 'WP_PROXY_HOST' ) ) {
return WP_PROXY_HOST;
}
return '';
}
/**
* Retrieve the port for the proxy server.
*
* @since 2.8.0
*
* @return string
*/
public function port() {
if ( defined( 'WP_PROXY_PORT' ) ) {
return WP_PROXY_PORT;
}
return '';
}
/**
* Retrieve the username for proxy authentication.
*
* @since 2.8.0
*
* @return string
*/
public function username() {
if ( defined( 'WP_PROXY_USERNAME' ) ) {
return WP_PROXY_USERNAME;
}
return '';
}
/**
* Retrieve the password for proxy authentication.
*
* @since 2.8.0
*
* @return string
*/
public function password() {
if ( defined( 'WP_PROXY_PASSWORD' ) ) {
return WP_PROXY_PASSWORD;
}
return '';
}
/**
* Retrieve authentication string for proxy authentication.
*
* @since 2.8.0
*
* @return string
*/
public function authentication() {
return $this->username() . ':' . $this->password();
}
/**
* Retrieve header string for proxy authentication.
*
* @since 2.8.0
*
* @return string
*/
public function authentication_header() {
return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );
}
/**
* Determines whether the request should be sent through a proxy.
*
* We want to keep localhost and the site URL from being sent through the proxy, because
* some proxies can not handle this. We also have the constant available for defining other
* hosts that won't be sent through the proxy.
*
* @since 2.8.0
*
* @param string $uri URL of the request.
* @return bool Whether to send the request through the proxy.
*/
public function send_through_proxy( $uri ) {
$check = parse_url( $uri );
// Malformed URL, can not process, but this could mean ssl, so let through anyway.
if ( false === $check ) {
return true;
}
$home = parse_url( get_option( 'siteurl' ) );
/**
* Filters whether to preempt sending the request through the proxy.
*
* Returning false will bypass the proxy; returning true will send
* the request through the proxy. Returning null bypasses the filter.
*
* @since 3.5.0
*
* @param bool|null $override Whether to send the request through the proxy. Default null.
* @param string $uri URL of the request.
* @param array $check Associative array result of parsing the request URL with `parse_url()`.
* @param array $home Associative array result of parsing the site URL with `parse_url()`.
*/
$result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home );
if ( ! is_null( $result ) ) {
return $result;
}
if ( 'localhost' === $check['host'] || ( isset( $home['host'] ) && $home['host'] === $check['host'] ) ) {
return false;
}
if ( ! defined( 'WP_PROXY_BYPASS_HOSTS' ) ) {
return true;
}
static $bypass_hosts = null;
static $wildcard_regex = array();
if ( null === $bypass_hosts ) {
$bypass_hosts = preg_split( '|,\s*|', WP_PROXY_BYPASS_HOSTS );
if ( false !== strpos( WP_PROXY_BYPASS_HOSTS, '*' ) ) {
$wildcard_regex = array();
foreach ( $bypass_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'], $bypass_hosts, true );
}
}
}
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