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class.jetpack-client.php
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class.jetpack-client.php
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<?php
class Jetpack_Client {
const WPCOM_JSON_API_HOST = 'public-api.wordpress.com';
const WPCOM_JSON_API_VERSION = '1.1';
/**
* Makes an authorized remote request using Jetpack_Signature
*
* @return array|WP_Error WP HTTP response on success
*/
public static function remote_request( $args, $body = null ) {
$defaults = array(
'url' => '',
'user_id' => 0,
'blog_id' => 0,
'auth_location' => JETPACK_CLIENT__AUTH_LOCATION,
'method' => 'POST',
'timeout' => 10,
'redirection' => 0,
);
$args = wp_parse_args( $args, $defaults );
$args['blog_id'] = (int) $args['blog_id'];
if ( 'header' != $args['auth_location'] ) {
$args['auth_location'] = 'query_string';
}
$token = Jetpack_Data::get_access_token( $args['user_id'] );
if ( !$token ) {
return new Jetpack_Error( 'missing_token' );
}
$method = strtoupper( $args['method'] );
$timeout = intval( $args['timeout'] );
$redirection = $args['redirection'];
$request = compact( 'method', 'body', 'timeout', 'redirection' );
@list( $token_key, $secret ) = explode( '.', $token->secret );
if ( empty( $token ) || empty( $secret ) ) {
return new Jetpack_Error( 'malformed_token' );
}
$token_key = sprintf( '%s:%d:%d', $token_key, JETPACK__API_VERSION, $token->external_user_id );
require_once JETPACK__PLUGIN_DIR . 'class.jetpack-signature.php';
$time_diff = (int) Jetpack_Options::get_option( 'time_diff' );
$jetpack_signature = new Jetpack_Signature( $token->secret, $time_diff );
$timestamp = time() + $time_diff;
if( function_exists( 'wp_generate_password' ) ) {
$nonce = wp_generate_password( 10, false );
} else {
$nonce = substr( sha1( rand( 0, 1000000 ) ), 0, 10);
}
// Kind of annoying. Maybe refactor Jetpack_Signature to handle body-hashing
if ( is_null( $body ) ) {
$body_hash = '';
} else {
if ( !is_string( $body ) ) {
return new Jetpack_Error( 'invalid_body', 'Body is malformed.' );
}
$body_hash = jetpack_sha1_base64( $body );
}
$auth = array(
'token' => $token_key,
'timestamp' => $timestamp,
'nonce' => $nonce,
'body-hash' => $body_hash,
);
if ( false !== strpos( $args['url'], 'xmlrpc.php' ) ) {
$url_args = array(
'for' => 'jetpack',
'wpcom_blog_id' => Jetpack_Options::get_option( 'id' ),
);
} else {
$url_args = array();
}
if ( 'header' != $args['auth_location'] ) {
$url_args += $auth;
}
$url = add_query_arg( urlencode_deep( $url_args ), $args['url'] );
$url = Jetpack::fix_url_for_bad_hosts( $url );
$signature = $jetpack_signature->sign_request( $token_key, $timestamp, $nonce, $body_hash, $method, $url, $body, false );
if ( !$signature || is_wp_error( $signature ) ) {
return $signature;
}
// Send an Authorization header so various caches/proxies do the right thing
$auth['signature'] = $signature;
$auth['version'] = JETPACK__VERSION;
$header_pieces = array();
foreach ( $auth as $key => $value ) {
$header_pieces[] = sprintf( '%s="%s"', $key, $value );
}
$request['headers'] = array(
'Authorization' => "X_JETPACK " . join( ' ', $header_pieces ),
);
if ( 'header' != $args['auth_location'] ) {
$url = add_query_arg( 'signature', urlencode( $signature ), $url );
}
return Jetpack_Client::_wp_remote_request( $url, $request );
}
/**
* Wrapper for wp_remote_request(). Turns off SSL verification for certain SSL errors.
* This is lame, but many, many, many hosts have misconfigured SSL.
*
* When Jetpack is registered, the jetpack_fallback_no_verify_ssl_certs option is set to the current time if:
* 1. a certificate error is found AND
* 2. not verifying the certificate works around the problem.
*
* The option is checked on each request.
*
* @internal
* @see Jetpack::fix_url_for_bad_hosts()
*
* @return array|WP_Error WP HTTP response on success
*/
public static function _wp_remote_request( $url, $args, $set_fallback = false ) {
/**
* SSL verification (`sslverify`) for the JetpackClient remote request
* defaults to off, use this filter to force it on.
*
* Return `true` to ENABLE SSL verification, return `false`
* to DISABLE SSL verification.
*
* @since 3.6.0
*
* @param bool Whether to force `sslverify` or not.
*/
if ( apply_filters( 'jetpack_client_verify_ssl_certs', false ) ) {
return wp_remote_request( $url, $args );
}
$fallback = Jetpack_Options::get_option( 'fallback_no_verify_ssl_certs' );
if ( false === $fallback ) {
Jetpack_Options::update_option( 'fallback_no_verify_ssl_certs', 0 );
}
if ( (int) $fallback ) {
// We're flagged to fallback
$args['sslverify'] = false;
}
$response = wp_remote_request( $url, $args );
if (
!$set_fallback // We're not allowed to set the flag on this request, so whatever happens happens
||
isset( $args['sslverify'] ) && !$args['sslverify'] // No verification - no point in doing it again
||
!is_wp_error( $response ) // Let it ride
) {
Jetpack_Client::set_time_diff( $response, $set_fallback );
return $response;
}
// At this point, we're not flagged to fallback and we are allowed to set the flag on this request.
$message = $response->get_error_message();
// Is it an SSL Certificate verification error?
if (
false === strpos( $message, '14090086' ) // OpenSSL SSL3 certificate error
&&
false === strpos( $message, '1407E086' ) // OpenSSL SSL2 certificate error
&&
false === strpos( $message, 'error setting certificate verify locations' ) // cURL CA bundle not found
&&
false === strpos( $message, 'Peer certificate cannot be authenticated with' ) // cURL CURLE_SSL_CACERT: CA bundle found, but not helpful
// different versions of curl have different error messages
// this string should catch them all
&&
false === strpos( $message, 'Problem with the SSL CA cert' ) // cURL CURLE_SSL_CACERT_BADFILE: probably access rights
) {
// No, it is not.
return $response;
}
// Redo the request without SSL certificate verification.
$args['sslverify'] = false;
$response = wp_remote_request( $url, $args );
if ( !is_wp_error( $response ) ) {
// The request went through this time, flag for future fallbacks
Jetpack_Options::update_option( 'fallback_no_verify_ssl_certs', time() );
Jetpack_Client::set_time_diff( $response, $set_fallback );
}
return $response;
}
public static function set_time_diff( &$response, $force_set = false ) {
$code = wp_remote_retrieve_response_code( $response );
// Only trust the Date header on some responses
if ( 200 != $code && 304 != $code && 400 != $code && 401 != $code ) {
return;
}
if ( !$date = wp_remote_retrieve_header( $response, 'date' ) ) {
return;
}
if ( 0 >= $time = (int) strtotime( $date ) ) {
return;
}
$time_diff = $time - time();
if ( $force_set ) { // during register
Jetpack_Options::update_option( 'time_diff', $time_diff );
} else { // otherwise
$old_diff = Jetpack_Options::get_option( 'time_diff' );
if ( false === $old_diff || abs( $time_diff - (int) $old_diff ) > 10 ) {
Jetpack_Options::update_option( 'time_diff', $time_diff );
}
}
}
/**
* Query the WordPress.com REST API using the blog token
*
* @param string $path
* @param string $version
* @param array $args
* @param string $body
* @return array|WP_Error $response Data.
*/
static function wpcom_json_api_request_as_blog( $path, $version = self::WPCOM_JSON_API_VERSION, $args = array(), $body = null ) {
$filtered_args = array_intersect_key( $args, array(
'method' => 'string',
'timeout' => 'int',
'redirection' => 'int',
) );
/**
* Determines whether Jetpack can send outbound https requests to the WPCOM api.
*
* @since 3.6.0
*
* @param bool $proto Defaults to true.
*/
$proto = apply_filters( 'jetpack_can_make_outbound_https', true ) ? 'https' : 'http';
// unprecedingslashit
$_path = preg_replace( '/^\//', '', $path );
// Use GET by default whereas `remote_request` uses POST
if ( isset( $filtered_args['method'] ) && strtoupper( $filtered_args['method'] === 'POST' ) ) {
$request_method = 'POST';
} else {
$request_method = 'GET';
}
$validated_args = array_merge( $filtered_args, array(
'url' => sprintf( '%s://%s/rest/v%s/%s', $proto, self::WPCOM_JSON_API_HOST, $version, $_path ),
'blog_id' => (int) Jetpack_Options::get_option( 'id' ),
'method' => $request_method,
) );
return Jetpack_Client::remote_request( $validated_args, $body );
}
}