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<?php
/**
* Core HTTP Request API
*
* Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk
* decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations.
*
* @package WordPress
* @subpackage HTTP
*/
/**
* Returns the initialized WP_Http Object
*
* @since 2.7.0
* @access private
*
* @staticvar WP_Http $http
*
* @return WP_Http HTTP Transport object.
*/
function _wp_http_get_object() {
static $http = null;
if ( is_null( $http ) ) {
$http = new WP_Http();
}
return $http;
}
/**
* Retrieve the raw response from a safe HTTP request.
*
* This function is ideal when the HTTP request is being made to an arbitrary
* URL. The URL is validated to avoid redirection and request forgery attacks.
*
* @since 3.6.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_safe_remote_request( $url, $args = array() ) {
$args['reject_unsafe_urls'] = true;
$http = _wp_http_get_object();
return $http->request( $url, $args );
}
/**
* Retrieve the raw response from a safe HTTP request using the GET method.
*
* This function is ideal when the HTTP request is being made to an arbitrary
* URL. The URL is validated to avoid redirection and request forgery attacks.
*
* @since 3.6.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_safe_remote_get( $url, $args = array() ) {
$args['reject_unsafe_urls'] = true;
$http = _wp_http_get_object();
return $http->get( $url, $args );
}
/**
* Retrieve the raw response from a safe HTTP request using the POST method.
*
* This function is ideal when the HTTP request is being made to an arbitrary
* URL. The URL is validated to avoid redirection and request forgery attacks.
*
* @since 3.6.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_safe_remote_post( $url, $args = array() ) {
$args['reject_unsafe_urls'] = true;
$http = _wp_http_get_object();
return $http->post( $url, $args );
}
/**
* Retrieve the raw response from a safe HTTP request using the HEAD method.
*
* This function is ideal when the HTTP request is being made to an arbitrary
* URL. The URL is validated to avoid redirection and request forgery attacks.
*
* @since 3.6.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_safe_remote_head( $url, $args = array() ) {
$args['reject_unsafe_urls'] = true;
$http = _wp_http_get_object();
return $http->head( $url, $args );
}
/**
* Retrieve the raw response from the HTTP request.
*
* The array structure is a little complex:
*
* $res = array(
* 'headers' => array(),
* 'response' => array(
* 'code' => int,
* 'message' => string
* )
* );
*
* All of the headers in $res['headers'] are with the name as the key and the
* value as the value. So to get the User-Agent, you would do the following.
*
* $user_agent = $res['headers']['user-agent'];
*
* The body is the raw response content and can be retrieved from $res['body'].
*
* This function is called first to make the request and there are other API
* functions to abstract out the above convoluted setup.
*
* Request method defaults for helper functions:
* - Default 'GET' for wp_remote_get()
* - Default 'POST' for wp_remote_post()
* - Default 'HEAD' for wp_remote_head()
*
* @since 2.7.0
*
* @see WP_Http::request() For additional information on default arguments.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_remote_request( $url, $args = array() ) {
$http = _wp_http_get_object();
return $http->request( $url, $args );
}
/**
* Retrieve the raw response from the HTTP request using the GET method.
*
* @since 2.7.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_remote_get( $url, $args = array() ) {
$http = _wp_http_get_object();
return $http->get( $url, $args );
}
/**
* Retrieve the raw response from the HTTP request using the POST method.
*
* @since 2.7.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_remote_post( $url, $args = array() ) {
$http = _wp_http_get_object();
return $http->post( $url, $args );
}
/**
* Retrieve the raw response from the HTTP request using the HEAD method.
*
* @since 2.7.0
*
* @see wp_remote_request() For more information on the response array format.
* @see WP_Http::request() For default arguments information.
*
* @param string $url Site URL to retrieve.
* @param array $args Optional. Request arguments. Default empty array.
* @return WP_Error|array The response or WP_Error on failure.
*/
function wp_remote_head( $url, $args = array() ) {
$http = _wp_http_get_object();
return $http->head( $url, $args );
}
/**
* Retrieve only the headers from the raw response.
*
* @since 2.7.0
* @since 4.6.0 Return value changed from an array to an Requests_Utility_CaseInsensitiveDictionary instance.
*
* @see \Requests_Utility_CaseInsensitiveDictionary
*
* @param array $response HTTP response.
* @return array|\Requests_Utility_CaseInsensitiveDictionary The headers of the response. Empty array if incorrect parameter given.
*/
function wp_remote_retrieve_headers( $response ) {
if ( is_wp_error( $response ) || ! isset( $response['headers'] ) ) {
return array();
}
return $response['headers'];
}
/**
* Retrieve a single header by name from the raw response.
*
* @since 2.7.0
*
* @param array $response
* @param string $header Header name to retrieve value from.
* @return string The header value. Empty string on if incorrect parameter given, or if the header doesn't exist.
*/
function wp_remote_retrieve_header( $response, $header ) {
if ( is_wp_error( $response ) || ! isset( $response['headers'] ) ) {
return '';
}
if ( isset( $response['headers'][ $header ] ) ) {
return $response['headers'][ $header ];
}
return '';
}
/**
* Retrieve only the response code from the raw response.
*
* Will return an empty array if incorrect parameter value is given.
*
* @since 2.7.0
*
* @param array $response HTTP response.
* @return int|string The response code as an integer. Empty string on incorrect parameter given.
*/
function wp_remote_retrieve_response_code( $response ) {
if ( is_wp_error( $response ) || ! isset( $response['response'] ) || ! is_array( $response['response'] ) ) {
return '';
}
return $response['response']['code'];
}
/**
* Retrieve only the response message from the raw response.
*
* Will return an empty array if incorrect parameter value is given.
*
* @since 2.7.0
*
* @param array $response HTTP response.
* @return string The response message. Empty string on incorrect parameter given.
*/
function wp_remote_retrieve_response_message( $response ) {
if ( is_wp_error( $response ) || ! isset( $response['response'] ) || ! is_array( $response['response'] ) ) {
return '';
}
return $response['response']['message'];
}
/**
* Retrieve only the body from the raw response.
*
* @since 2.7.0
*
* @param array $response HTTP response.
* @return string The body of the response. Empty string if no body or incorrect parameter given.
*/
function wp_remote_retrieve_body( $response ) {
if ( is_wp_error( $response ) || ! isset( $response['body'] ) ) {
return '';
}
return $response['body'];
}
/**
* Retrieve only the cookies from the raw response.
*
* @since 4.4.0
*
* @param array $response HTTP response.
* @return array An array of `WP_Http_Cookie` objects from the response. Empty array if there are none, or the response is a WP_Error.
*/
function wp_remote_retrieve_cookies( $response ) {
if ( is_wp_error( $response ) || empty( $response['cookies'] ) ) {
return array();
}
return $response['cookies'];
}
/**
* Retrieve a single cookie by name from the raw response.
*
* @since 4.4.0
*
* @param array $response HTTP response.
* @param string $name The name of the cookie to retrieve.
* @return WP_Http_Cookie|string The `WP_Http_Cookie` object. Empty string if the cookie isn't present in the response.
*/
function wp_remote_retrieve_cookie( $response, $name ) {
$cookies = wp_remote_retrieve_cookies( $response );
if ( empty( $cookies ) ) {
return '';
}
foreach ( $cookies as $cookie ) {
if ( $cookie->name === $name ) {
return $cookie;
}
}
return '';
}
/**
* Retrieve a single cookie's value by name from the raw response.
*
* @since 4.4.0
*
* @param array $response HTTP response.
* @param string $name The name of the cookie to retrieve.
* @return string The value of the cookie. Empty string if the cookie isn't present in the response.
*/
function wp_remote_retrieve_cookie_value( $response, $name ) {
$cookie = wp_remote_retrieve_cookie( $response, $name );
if ( ! is_a( $cookie, 'WP_Http_Cookie' ) ) {
return '';
}
return $cookie->value;
}
/**
* Determines if there is an HTTP Transport that can process this request.
*
* @since 3.2.0
*
* @param array $capabilities Array of capabilities to test or a wp_remote_request() $args array.
* @param string $url Optional. If given, will check if the URL requires SSL and adds
* that requirement to the capabilities array.
*
* @return bool
*/
function wp_http_supports( $capabilities = array(), $url = null ) {
$http = _wp_http_get_object();
$capabilities = wp_parse_args( $capabilities );
$count = count( $capabilities );
// If we have a numeric $capabilities array, spoof a wp_remote_request() associative $args array
if ( $count && count( array_filter( array_keys( $capabilities ), 'is_numeric' ) ) == $count ) {
$capabilities = array_combine( array_values( $capabilities ), array_fill( 0, $count, true ) );
}
if ( $url && ! isset( $capabilities['ssl'] ) ) {
$scheme = parse_url( $url, PHP_URL_SCHEME );
if ( 'https' == $scheme || 'ssl' == $scheme ) {
$capabilities['ssl'] = true;
}
}
return (bool) $http->_get_first_available_transport( $capabilities );
}
/**
* Get the HTTP Origin of the current request.
*
* @since 3.4.0
*
* @return string URL of the origin. Empty string if no origin.
*/
function get_http_origin() {
$origin = '';
if ( ! empty( $_SERVER['HTTP_ORIGIN'] ) ) {
$origin = $_SERVER['HTTP_ORIGIN'];
}
/**
* Change the origin of an HTTP request.
*
* @since 3.4.0
*
* @param string $origin The original origin for the request.
*/
return apply_filters( 'http_origin', $origin );
}
/**
* Retrieve list of allowed HTTP origins.
*
* @since 3.4.0
*
* @return array Array of origin URLs.
*/
function get_allowed_http_origins() {
$admin_origin = parse_url( admin_url() );
$home_origin = parse_url( home_url() );
// @todo preserve port?
$allowed_origins = array_unique(
array(
'http://' . $admin_origin['host'],
'https://' . $admin_origin['host'],
'http://' . $home_origin['host'],
'https://' . $home_origin['host'],
)
);
/**
* Change the origin types allowed for HTTP requests.
*
* @since 3.4.0
*
* @param array $allowed_origins {
* Default allowed HTTP origins.
* @type string Non-secure URL for admin origin.
* @type string Secure URL for admin origin.
* @type string Non-secure URL for home origin.
* @type string Secure URL for home origin.
* }
*/
return apply_filters( 'allowed_http_origins', $allowed_origins );
}
/**
* Determines if the HTTP origin is an authorized one.
*
* @since 3.4.0
*
* @param null|string $origin Origin URL. If not provided, the value of get_http_origin() is used.
* @return string Origin URL if allowed, empty string if not.
*/
function is_allowed_http_origin( $origin = null ) {
$origin_arg = $origin;
if ( null === $origin ) {
$origin = get_http_origin();
}
if ( $origin && ! in_array( $origin, get_allowed_http_origins() ) ) {
$origin = '';
}
/**
* Change the allowed HTTP origin result.
*
* @since 3.4.0
*
* @param string $origin Origin URL if allowed, empty string if not.
* @param string $origin_arg Original origin string passed into is_allowed_http_origin function.
*/
return apply_filters( 'allowed_http_origin', $origin, $origin_arg );
}
/**
* Send Access-Control-Allow-Origin and related headers if the current request
* is from an allowed origin.
*
* If the request is an OPTIONS request, the script exits with either access
* control headers sent, or a 403 response if the origin is not allowed. For
* other request methods, you will receive a return value.
*
* @since 3.4.0
*
* @return string|false Returns the origin URL if headers are sent. Returns false
* if headers are not sent.
*/
function send_origin_headers() {
$origin = get_http_origin();
if ( is_allowed_http_origin( $origin ) ) {
@header( 'Access-Control-Allow-Origin: ' . $origin );
@header( 'Access-Control-Allow-Credentials: true' );
if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) {
exit;
}
return $origin;
}
if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) {
status_header( 403 );
exit;
}
return false;
}
/**
* Validate a URL for safe use in the HTTP API.
*
* @since 3.5.2
*
* @param string $url
* @return false|string URL or false on failure.
*/
function wp_http_validate_url( $url ) {
$original_url = $url;
$url = wp_kses_bad_protocol( $url, array( 'http', 'https' ) );
if ( ! $url || strtolower( $url ) !== strtolower( $original_url ) ) {
return false;
}
$parsed_url = @parse_url( $url );
if ( ! $parsed_url || empty( $parsed_url['host'] ) ) {
return false;
}
if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) ) {
return false;
}
if ( false !== strpbrk( $parsed_url['host'], ':#?[]' ) ) {
return false;
}
$parsed_home = @parse_url( get_option( 'home' ) );
if ( isset( $parsed_home['host'] ) ) {
$same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] );
} else {
$same_host = false;
}
if ( ! $same_host ) {
$host = trim( $parsed_url['host'], '.' );
if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $host ) ) {
$ip = $host;
} else {
$ip = gethostbyname( $host );
if ( $ip === $host ) { // Error condition for gethostbyname()
$ip = false;
}
}
if ( $ip ) {
$parts = array_map( 'intval', explode( '.', $ip ) );
if ( 127 === $parts[0] || 10 === $parts[0] || 0 === $parts[0]
|| ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
|| ( 192 === $parts[0] && 168 === $parts[1] )
) {
// If host appears local, reject unless specifically allowed.
/**
* Check if HTTP request is external or not.
*
* Allows to change and allow external requests for the HTTP request.
*
* @since 3.6.0
*
* @param bool false Whether HTTP request is external or not.
* @param string $host IP of the requested host.
* @param string $url URL of the requested host.
*/
if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) ) {
return false;
}
}
}
}
if ( empty( $parsed_url['port'] ) ) {
return $url;
}
$port = $parsed_url['port'];
if ( 80 === $port || 443 === $port || 8080 === $port ) {
return $url;
}
if ( $parsed_home && $same_host && isset( $parsed_home['port'] ) && $parsed_home['port'] === $port ) {
return $url;
}
return false;
}
/**
* Whitelists allowed redirect hosts for safe HTTP requests as well.
*
* Attached to the {@see 'http_request_host_is_external'} filter.
*
* @since 3.6.0
*
* @param bool $is_external
* @param string $host
* @return bool
*/
function allowed_http_request_hosts( $is_external, $host ) {
if ( ! $is_external && wp_validate_redirect( 'http://' . $host ) ) {
$is_external = true;
}
return $is_external;
}
/**
* Whitelists any domain in a multisite installation for safe HTTP requests.
*
* Attached to the {@see 'http_request_host_is_external'} filter.
*
* @since 3.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
* @staticvar array $queried
*
* @param bool $is_external
* @param string $host
* @return bool
*/
function ms_allowed_http_request_hosts( $is_external, $host ) {
global $wpdb;
static $queried = array();
if ( $is_external ) {
return $is_external;
}
if ( $host === get_network()->domain ) {
return true;
}
if ( isset( $queried[ $host ] ) ) {
return $queried[ $host ];
}
$queried[ $host ] = (bool) $wpdb->get_var( $wpdb->prepare( "SELECT domain FROM $wpdb->blogs WHERE domain = %s LIMIT 1", $host ) );
return $queried[ $host ];
}
/**
* A wrapper for PHP's parse_url() function that handles consistency in the return
* values across PHP versions.
*
* PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including
* schemeless and relative url's with :// in the path. This function works around
* those limitations providing a standard output on PHP 5.2~5.4+.
*
* Secondly, across various PHP versions, schemeless URLs starting containing a ":"
* in the query are being handled inconsistently. This function works around those
* differences as well.
*
* Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated
* when URL parsing failed.
*
* @since 4.4.0
* @since 4.7.0 The `$component` parameter was added for parity with PHP's `parse_url()`.
*
* @link https://secure.php.net/manual/en/function.parse-url.php
*
* @param string $url The URL to parse.
* @param int $component The specific component to retrieve. Use one of the PHP
* predefined constants to specify which one.
* Defaults to -1 (= return all parts as an array).
* @return mixed False on parse failure; Array of URL components on success;
* When a specific component has been requested: null if the component
* doesn't exist in the given URL; a string or - in the case of
* PHP_URL_PORT - integer when it does. See parse_url()'s return values.
*/
function wp_parse_url( $url, $component = -1 ) {
$to_unset = array();
$url = strval( $url );
if ( '//' === substr( $url, 0, 2 ) ) {
$to_unset[] = 'scheme';
$url = 'placeholder:' . $url;
} elseif ( '/' === substr( $url, 0, 1 ) ) {
$to_unset[] = 'scheme';
$to_unset[] = 'host';
$url = 'placeholder://placeholder' . $url;
}
$parts = @parse_url( $url );
if ( false === $parts ) {
// Parsing failure.
return $parts;
}
// Remove the placeholder values.
foreach ( $to_unset as $key ) {
unset( $parts[ $key ] );
}
return _get_component_from_parsed_url_array( $parts, $component );
}
/**
* Retrieve a specific component from a parsed URL array.
*
* @internal
*
* @since 4.7.0
* @access private
*
* @link https://secure.php.net/manual/en/function.parse-url.php
*
* @param array|false $url_parts The parsed URL. Can be false if the URL failed to parse.
* @param int $component The specific component to retrieve. Use one of the PHP
* predefined constants to specify which one.
* Defaults to -1 (= return all parts as an array).
* @return mixed False on parse failure; Array of URL components on success;
* When a specific component has been requested: null if the component
* doesn't exist in the given URL; a string or - in the case of
* PHP_URL_PORT - integer when it does. See parse_url()'s return values.
*/
function _get_component_from_parsed_url_array( $url_parts, $component = -1 ) {
if ( -1 === $component ) {
return $url_parts;
}
$key = _wp_translate_php_url_constant_to_key( $component );
if ( false !== $key && is_array( $url_parts ) && isset( $url_parts[ $key ] ) ) {
return $url_parts[ $key ];
} else {
return null;
}
}
/**
* Translate a PHP_URL_* constant to the named array keys PHP uses.
*
* @internal
*
* @since 4.7.0
* @access private
*
* @link https://secure.php.net/manual/en/url.constants.php
*
* @param int $constant PHP_URL_* constant.
* @return string|bool The named key or false.
*/
function _wp_translate_php_url_constant_to_key( $constant ) {
$translation = array(
PHP_URL_SCHEME => 'scheme',
PHP_URL_HOST => 'host',
PHP_URL_PORT => 'port',
PHP_URL_USER => 'user',
PHP_URL_PASS => 'pass',
PHP_URL_PATH => 'path',
PHP_URL_QUERY => 'query',
PHP_URL_FRAGMENT => 'fragment',
);
if ( isset( $translation[ $constant ] ) ) {
return $translation[ $constant ];
} else {
return false;
}
}
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