wordpress-azure/wp-includes/class-http.php at master · anogues/wordpress-azure · GitHub

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<?php

/**

* HTTP API: WP_Http class

* @package WordPress

* @subpackage HTTP

* @since 2.7.0

if ( ! class_exists( 'Requests' ) ) {

require( ABSPATH . WPINC . '/class-requests.php' );

Requests::register_autoloader();

Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' );

}

/**

* Core class used for managing HTTP transports and making HTTP requests.

* This class is used to consistently make outgoing HTTP requests easy for developers

* while still being compatible with the many PHP configurations under which

* WordPress runs.

* Debugging includes several actions, which pass different variables for debugging the HTTP API.

* @since 2.7.0

class WP_Http {

// Aliases for HTTP response codes.

const HTTP_CONTINUE = 100;

const SWITCHING_PROTOCOLS = 101;

const PROCESSING = 102;

const EARLY_HINTS = 103;

const OK = 200;

const CREATED = 201;

const ACCEPTED = 202;

const NON_AUTHORITATIVE_INFORMATION = 203;

const NO_CONTENT = 204;

const RESET_CONTENT = 205;

const PARTIAL_CONTENT = 206;

const MULTI_STATUS = 207;

const IM_USED = 226;

const MULTIPLE_CHOICES = 300;

const MOVED_PERMANENTLY = 301;

const FOUND = 302;

const SEE_OTHER = 303;

const NOT_MODIFIED = 304;

const USE_PROXY = 305;

const RESERVED = 306;

const TEMPORARY_REDIRECT = 307;

const PERMANENT_REDIRECT = 308;

const BAD_REQUEST = 400;

const UNAUTHORIZED = 401;

const PAYMENT_REQUIRED = 402;

const FORBIDDEN = 403;

const NOT_FOUND = 404;

const METHOD_NOT_ALLOWED = 405;

const NOT_ACCEPTABLE = 406;

const PROXY_AUTHENTICATION_REQUIRED = 407;

const REQUEST_TIMEOUT = 408;

const CONFLICT = 409;

const GONE = 410;

const LENGTH_REQUIRED = 411;

const PRECONDITION_FAILED = 412;

const REQUEST_ENTITY_TOO_LARGE = 413;

const REQUEST_URI_TOO_LONG = 414;

const UNSUPPORTED_MEDIA_TYPE = 415;

const REQUESTED_RANGE_NOT_SATISFIABLE = 416;

const EXPECTATION_FAILED = 417;

const IM_A_TEAPOT = 418;

const MISDIRECTED_REQUEST = 421;

const UNPROCESSABLE_ENTITY = 422;

const LOCKED = 423;

const FAILED_DEPENDENCY = 424;

const UPGRADE_REQUIRED = 426;

const PRECONDITION_REQUIRED = 428;

const TOO_MANY_REQUESTS = 429;

const REQUEST_HEADER_FIELDS_TOO_LARGE = 431;

const UNAVAILABLE_FOR_LEGAL_REASONS = 451;

const INTERNAL_SERVER_ERROR = 500;

const NOT_IMPLEMENTED = 501;

const BAD_GATEWAY = 502;

const SERVICE_UNAVAILABLE = 503;

const GATEWAY_TIMEOUT = 504;

const HTTP_VERSION_NOT_SUPPORTED = 505;

const VARIANT_ALSO_NEGOTIATES = 506;

const INSUFFICIENT_STORAGE = 507;

const NOT_EXTENDED = 510;

const NETWORK_AUTHENTICATION_REQUIRED = 511;

/**

* Send an HTTP request to a URI.

* Please note: The only URI that are supported in the HTTP Transport implementation

* are the HTTP and HTTPS protocols.

* @since 2.7.0

* @param string $url The request URL.

* @param string|array $args {

* Optional. Array or string of HTTP request arguments.

* @type string $method Request method. Accepts 'GET', 'POST', 'HEAD', 'PUT', 'DELETE',

* 'TRACE', 'OPTIONS', or 'PATCH'.

* Some transports technically allow others, but should not be

* assumed. Default 'GET'.

* @type int $timeout How long the connection should stay open in seconds. Default 5.

* @type int $redirection Number of allowed redirects. Not supported by all transports

* Default 5.

* @type string $httpversion Version of the HTTP protocol to use. Accepts '1.0' and '1.1'.

* Default '1.0'.

* @type string $user-agent User-agent value sent.

* Default 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ).

* @type bool $reject_unsafe_urls Whether to pass URLs through wp_http_validate_url().

* Default false.

* @type bool $blocking Whether the calling code requires the result of the request.

* If set to false, the request will be sent to the remote server,

* and processing returned to the calling code immediately, the caller

* will know if the request succeeded or failed, but will not receive

* any response from the remote server. Default true.

* @type string|array $headers Array or string of headers to send with the request.

* Default empty array.

* @type array $cookies List of cookies to send with the request. Default empty array.

* @type string|array $body Body to send with the request. Default null.

* @type bool $compress Whether to compress the $body when sending the request.

* Default false.

* @type bool $decompress Whether to decompress a compressed response. If set to false and

* compressed content is returned in the response anyway, it will

* need to be separately decompressed. Default true.

* @type bool $sslverify Whether to verify SSL for the request. Default true.

* @type string sslcertificates Absolute path to an SSL certificate .crt file.

* Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'.

* @type bool $stream Whether to stream to a file. If set to true and no filename was

* given, it will be droped it in the WP temp dir and its name will

* be set using the basename of the URL. Default false.

* @type string $filename Filename of the file to write to when streaming. $stream must be

* set to true. Default null.

* @type int $limit_response_size Size in bytes to limit the response to. Default null.

* }

* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.

* A WP_Error instance upon error.

public function request( $url, $args = array() ) {

$defaults = array(

'method' => 'GET',

/**

* Filters the timeout value for an HTTP request.

* @since 2.7.0

* @since 5.1.0 The `$url` parameter was added.

* @param int $timeout_value Time in seconds until a request times out. Default 5.

* @param string $url The request URL.

'timeout' => apply_filters( 'http_request_timeout', 5, $url ),

/**

* Filters the number of redirects allowed during an HTTP request.

* @since 2.7.0

* @since 5.1.0 The `$url` parameter was added.

* @param int $redirect_count Number of redirects allowed. Default 5.

* @param string $url The request URL.

'redirection' => apply_filters( 'http_request_redirection_count', 5, $url ),

/**

* Filters the version of the HTTP protocol used in a request.

* @since 2.7.0

* @since 5.1.0 The `$url` parameter was added.

* @param string $version Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'.

* @param string $url The request URL.

'httpversion' => apply_filters( 'http_request_version', '1.0', $url ),

/**

* Filters the user agent value sent with an HTTP request.

* @since 2.7.0

* @since 5.1.0 The `$url` parameter was added.

* @param string $user_agent WordPress user agent string.

* @param string $url The request URL.

'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ),

/**

* Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.

* @since 3.6.0

* @since 5.1.0 The `$url` parameter was added.

* @param bool $pass_url Whether to pass URLs through wp_http_validate_url(). Default false.

* @param string $url The request URL.

'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false, $url ),

'blocking' => true,

'headers' => array(),

'cookies' => array(),

'body' => null,

'compress' => false,

'decompress' => true,

'sslverify' => true,

'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt',

'stream' => false,

'filename' => null,

'limit_response_size' => null,

);

// Pre-parse for the HEAD checks.

$args = wp_parse_args( $args );

// By default, Head requests do not cause redirections.

if ( isset( $args['method'] ) && 'HEAD' == $args['method'] ) {

$defaults['redirection'] = 0;

}

$r = wp_parse_args( $args, $defaults );

/**

* Filters the arguments used in an HTTP request.

* @since 2.7.0

* @param array $r An array of HTTP request arguments.

* @param string $url The request URL.

$r = apply_filters( 'http_request_args', $r, $url );

// The transports decrement this, store a copy of the original value for loop purposes.

if ( ! isset( $r['_redirection'] ) ) {

$r['_redirection'] = $r['redirection'];

}

/**

* Filters whether to preempt an HTTP request's return value.

* Returning a non-false value from the filter will short-circuit the HTTP request and return

* early with that value. A filter should return either:

* - An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements

* - A WP_Error instance

* - boolean false (to avoid short-circuiting the response)

* Returning any other value may result in unexpected behaviour.

* @since 2.9.0

* @param false|array|WP_Error $preempt Whether to preempt an HTTP request's return value. Default false.

* @param array $r HTTP request arguments.

* @param string $url The request URL.

$pre = apply_filters( 'pre_http_request', false, $r, $url );

if ( false !== $pre ) {

return $pre;

}

if ( function_exists( 'wp_kses_bad_protocol' ) ) {

if ( $r['reject_unsafe_urls'] ) {

$url = wp_http_validate_url( $url );

}

if ( $url ) {

$url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );

}

$arrURL = @parse_url( $url );

if ( empty( $url ) || empty( $arrURL['scheme'] ) ) {

return new WP_Error( 'http_request_failed', __( 'A valid URL was not provided.' ) );

}

if ( $this->block_request( $url ) ) {

return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) );

}

// If we are streaming to a file but no filename was given drop it in the WP temp dir

// and pick its name using the basename of the $url

if ( $r['stream'] ) {

if ( empty( $r['filename'] ) ) {

$r['filename'] = get_temp_dir() . basename( $url );

}

// Force some settings if we are streaming to a file and check for existence and perms of destination directory

$r['blocking'] = true;

if ( ! wp_is_writable( dirname( $r['filename'] ) ) ) {

return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );

}

if ( is_null( $r['headers'] ) ) {

$r['headers'] = array();

}

// WP allows passing in headers as a string, weirdly.

if ( ! is_array( $r['headers'] ) ) {

$processedHeaders = WP_Http::processHeaders( $r['headers'] );

$r['headers'] = $processedHeaders['headers'];

}

// Setup arguments

$headers = $r['headers'];

$data = $r['body'];

$type = $r['method'];

$options = array(

'timeout' => $r['timeout'],

'useragent' => $r['user-agent'],

'blocking' => $r['blocking'],

'hooks' => new WP_HTTP_Requests_Hooks( $url, $r ),

);

// Ensure redirects follow browser behaviour.

$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) );

// Validate redirected URLs.

if ( function_exists( 'wp_kses_bad_protocol' ) && $r['reject_unsafe_urls'] ) {

$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'validate_redirects' ) );

}

if ( $r['stream'] ) {

$options['filename'] = $r['filename'];

}

if ( empty( $r['redirection'] ) ) {

$options['follow_redirects'] = false;

} else {

$options['redirects'] = $r['redirection'];

}

// Use byte limit, if we can

if ( isset( $r['limit_response_size'] ) ) {

$options['max_bytes'] = $r['limit_response_size'];

}

// If we've got cookies, use and convert them to Requests_Cookie.

if ( ! empty( $r['cookies'] ) ) {

$options['cookies'] = WP_Http::normalize_cookies( $r['cookies'] );

}

// SSL certificate handling

if ( ! $r['sslverify'] ) {

$options['verify'] = false;

$options['verifyname'] = false;

} else {

$options['verify'] = $r['sslcertificates'];

}

// All non-GET/HEAD requests should put the arguments in the form body.

if ( 'HEAD' !== $type && 'GET' !== $type ) {

$options['data_format'] = 'body';

}

/**

* Filters whether SSL should be verified for non-local requests.

* @since 2.8.0

* @since 5.1.0 The `$url` parameter was added.

* @param bool $ssl_verify Whether to verify the SSL connection. Default true.

* @param string $url The request URL.

$options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'], $url );

// Check for proxies.

$proxy = new WP_HTTP_Proxy();

if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {

$options['proxy'] = new Requests_Proxy_HTTP( $proxy->host() . ':' . $proxy->port() );

if ( $proxy->use_authentication() ) {

$options['proxy']->use_authentication = true;

$options['proxy']->user = $proxy->username();

$options['proxy']->pass = $proxy->password();

}

// Avoid issues where mbstring.func_overload is enabled

mbstring_binary_safe_encoding();

try {

$requests_response = Requests::request( $url, $headers, $data, $type, $options );

// Convert the response into an array

$http_response = new WP_HTTP_Requests_Response( $requests_response, $r['filename'] );

$response = $http_response->to_array();

// Add the original object to the array.

$response['http_response'] = $http_response;

} catch ( Requests_Exception $e ) {

$response = new WP_Error( 'http_request_failed', $e->getMessage() );

}

reset_mbstring_encoding();

/**

* Fires after an HTTP API response is received and before the response is returned.

* @since 2.8.0

* @param array|WP_Error $response HTTP response or WP_Error object.

* @param string $context Context under which the hook is fired.

* @param string $class HTTP transport used.

* @param array $r HTTP request arguments.

* @param string $url The request URL.

do_action( 'http_api_debug', $response, 'response', 'Requests', $r, $url );

if ( is_wp_error( $response ) ) {

return $response;

}

if ( ! $r['blocking'] ) {

return array(

'headers' => array(),

'body' => '',

'response' => array(

'code' => false,

'message' => false,

'cookies' => array(),

'http_response' => null,

);

}

/**

* Filters the HTTP API response immediately before the response is returned.

* @since 2.9.0

* @param array $response HTTP response.

* @param array $r HTTP request arguments.

* @param string $url The request URL.

return apply_filters( 'http_response', $response, $r, $url );

}

/**

* Normalizes cookies for using in Requests.

* @since 4.6.0

* @param array $cookies Array of cookies to send with the request.

* @return Requests_Cookie_Jar Cookie holder object.

public static function normalize_cookies( $cookies ) {

$cookie_jar = new Requests_Cookie_Jar();

foreach ( $cookies as $name => $value ) {

if ( $value instanceof WP_Http_Cookie ) {

$cookie_jar[ $value->name ] = new Requests_Cookie( $value->name, $value->value, $value->get_attributes(), array( 'host-only' => $value->host_only ) );

} elseif ( is_scalar( $value ) ) {

$cookie_jar[ $name ] = new Requests_Cookie( $name, $value );

}

return $cookie_jar;

}

/**

* Match redirect behaviour to browser handling.

* Changes 302 redirects from POST to GET to match browser handling. Per

* RFC 7231, user agents can deviate from the strict reading of the

* specification for compatibility purposes.

* @since 4.6.0

* @param string $location URL to redirect to.

* @param array $headers Headers for the redirect.

* @param string|array $data Body to send with the request.

* @param array $options Redirect request options.

* @param Requests_Response $original Response object.

public static function browser_redirect_compatibility( $location, $headers, $data, &$options, $original ) {

// Browser compat

if ( $original->status_code === 302 ) {

$options['type'] = Requests::GET;

}

/**

* Validate redirected URLs.

* @since 4.7.5

* @throws Requests_Exception On unsuccessful URL validation

* @param string $location URL to redirect to.

public static function validate_redirects( $location ) {

if ( ! wp_http_validate_url( $location ) ) {

throw new Requests_Exception( __( 'A valid URL was not provided.' ), 'wp_http.redirect_failed_validation' );

}

/**

* Tests which transports are capable of supporting the request.

* @since 3.2.0

* @param array $args Request arguments

* @param string $url URL to Request

* @return string|false Class name for the first transport that claims to support the request. False if no transport claims to support the request.

public function _get_first_available_transport( $args, $url = null ) {

$transports = array( 'curl', 'streams' );

/**

* Filters which HTTP transports are available and in what order.

* @since 3.7.0

* @param array $transports Array of HTTP transports to check. Default array contains

* 'curl', and 'streams', in that order.

* @param array $args HTTP request arguments.

* @param string $url The URL to request.

$request_order = apply_filters( 'http_api_transports', $transports, $args, $url );

// Loop over each transport on each HTTP request looking for one which will serve this request's needs.

foreach ( $request_order as $transport ) {

if ( in_array( $transport, $transports ) ) {

$transport = ucfirst( $transport );

}

$class = 'WP_Http_' . $transport;

// Check to see if this transport is a possibility, calls the transport statically.

if ( ! call_user_func( array( $class, 'test' ), $args, $url ) ) {

continue;

}

return $class;

}

return false;

}

/**

* Dispatches a HTTP request to a supporting transport.

* Tests each transport in order to find a transport which matches the request arguments.

* Also caches the transport instance to be used later.

* The order for requests is cURL, and then PHP Streams.

* @since 3.2.0

* @deprecated 5.1.0 Use WP_Http::request()

* @see WP_Http::request()

* @param string $url URL to Request

* @param array $args Request arguments

* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

private function _dispatch_request( $url, $args ) {

static $transports = array();

$class = $this->_get_first_available_transport( $args, $url );

if ( ! $class ) {

return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );

}

// Transport claims to support request, instantiate it and give it a whirl.

if ( empty( $transports[ $class ] ) ) {

$transports[ $class ] = new $class;

}

$response = $transports[ $class ]->request( $url, $args );

/** This action is documented in wp-includes/class-http.php */

do_action( 'http_api_debug', $response, 'response', $class, $args, $url );

if ( is_wp_error( $response ) ) {

return $response;

}

/** This filter is documented in wp-includes/class-http.php */

return apply_filters( 'http_response', $response, $args, $url );

}

/**

* Uses the POST HTTP method.

* Used for sending data that is expected to be in the body.

* @since 2.7.0

* @param string $url The request URL.

* @param string|array $args Optional. Override the defaults.

* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

public function post( $url, $args = array() ) {

$defaults = array( 'method' => 'POST' );

$r = wp_parse_args( $args, $defaults );

return $this->request( $url, $r );

}

/**

* Uses the GET HTTP method.

* Used for sending data that is expected to be in the body.

* @since 2.7.0

* @param string $url The request URL.

* @param string|array $args Optional. Override the defaults.

* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

public function get( $url, $args = array() ) {

$defaults = array( 'method' => 'GET' );

$r = wp_parse_args( $args, $defaults );

return $this->request( $url, $r );

}

/**

* Uses the HEAD HTTP method.

* Used for sending data that is expected to be in the body.

* @since 2.7.0

* @param string $url The request URL.

* @param string|array $args Optional. Override the defaults.

* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

public function head( $url, $args = array() ) {

$defaults = array( 'method' => 'HEAD' );

$r = wp_parse_args( $args, $defaults );

return $this->request( $url, $r );

}

/**

* Parses the responses and splits the parts into headers and body.

* @since 2.7.0

* @param string $strResponse The full response string

* @return array Array with 'headers' and 'body' keys.

public static function processResponse( $strResponse ) {

$res = explode( "\r\n\r\n", $strResponse, 2 );

return array(

'headers' => $res[0],

'body' => isset( $res[1] ) ? $res[1] : '',

);

}

/**

* Transform header string into an array.

* If an array is given then it is assumed to be raw header data with numeric keys with the

* headers as the values. No headers must be passed that were already processed.

* @since 2.7.0

* @param string|array $headers

* @param string $url The URL that was requested

* @return array Processed string headers. If duplicate headers are encountered,

* Then a numbered array is returned as the value of that header-key.

public static function processHeaders( $headers, $url = '' ) {

// Split headers, one per array element.

if ( is_string( $headers ) ) {

// Tolerate line terminator: CRLF = LF (RFC 2616 19.3).

$headers = str_replace( "\r\n", "\n", $headers );

* Unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>,

* <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2).

$headers = preg_replace( '/\n[ \t]/', ' ', $headers );

// Create the headers array.

$headers = explode( "\n", $headers );

}

$response = array(

'code' => 0,

'message' => '',

);

* If a redirection has taken place, The headers for each page request may have been passed.

* In this case, determine the final HTTP header and parse from there.

for ( $i = count( $headers ) - 1; $i >= 0; $i-- ) {

if ( ! empty( $headers[ $i ] ) && false === strpos( $headers[ $i ], ':' ) ) {

$headers = array_splice( $headers, $i );

break;

}

$cookies = array();

$newheaders = array();

foreach ( (array) $headers as $tempheader ) {

if ( empty( $tempheader ) ) {

continue;

}

if ( false === strpos( $tempheader, ':' ) ) {

$stack = explode( ' ', $tempheader, 3 );

$stack[] = '';

list( , $response['code'], $response['message']) = $stack;

continue;

}

list($key, $value) = explode( ':', $tempheader, 2 );

$key = strtolower( $key );

$value = trim( $value );

if ( isset( $newheaders[ $key ] ) ) {

if ( ! is_array( $newheaders[ $key ] ) ) {

$newheaders[ $key ] = array( $newheaders[ $key ] );

}

$newheaders[ $key ][] = $value;

} else {

$newheaders[ $key ] = $value;

}

if ( 'set-cookie' == $key ) {

$cookies[] = new WP_Http_Cookie( $value, $url );

}

// Cast the Response Code to an int

$response['code'] = intval( $response['code'] );

return array(

'response' => $response,

'headers' => $newheaders,

'cookies' => $cookies,

);

}

/**

* Takes the arguments for a ::request() and checks for the cookie array.

* If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,

* which are each parsed into strings and added to the Cookie: header (within the arguments array).

* Edits the array by reference.

* @since 2.8.0

* @param array $r Full array of args passed into ::request()

public static function buildCookieHeader( &$r ) {

if ( ! empty( $r['cookies'] ) ) {

// Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances.

foreach ( $r['cookies'] as $name => $value ) {

if ( ! is_object( $value ) ) {

$r['cookies'][ $name ] = new WP_Http_Cookie(

array(

'name' => $name,

'value' => $value,

)

);

}

$cookies_header = '';

foreach ( (array) $r['cookies'] as $cookie ) {

$cookies_header .= $cookie->getHeaderValue() . '; ';

}

$cookies_header = substr( $cookies_header, 0, -2 );

$r['headers']['cookie'] = $cookies_header;

}

/**

* Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.

* Based off the HTTP http_encoding_dechunk function.

* @link https://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.

* @since 2.7.0

* @param string $body Body content

* @return string Chunked decoded body on success or raw body on failure.

public static function chunkTransferDecode( $body ) {

// The body is not chunked encoded or is malformed.

if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) ) {

return $body;

}

$parsed_body = '';

// We'll be altering $body, so need a backup in case of error.

$body_original = $body;

while ( true ) {

$has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );

if ( ! $has_chunk || empty( $match[1] ) ) {

return $body_original;

}

$length = hexdec( $match[1] );

$chunk_length = strlen( $match[0] );

// Parse out the chunk of data.

$parsed_body .= substr( $body, $chunk_length, $length );

// Remove the chunk from the raw data.

$body = substr( $body, $length + $chunk_length );

// End of the document.

if ( '0' === trim( $body ) ) {

return $parsed_body;

}

/**

* Block requests through the proxy.

* 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

* @staticvar array|null $accessible_hosts

* @staticvar array $wildcard_regex

* @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 requests through the proxy.

* @since 2.8.0

* @param bool $block Whether to block local requests through proxy.

* 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 ( false !== strpos( 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 ); //Inverse logic, If it's in the array, then we can't access 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;

}

if ( ! $url_parts = wp_parse_url( $url ) ) {

return $maybe_relative_path;

}

if ( ! $relative_url_parts = wp_parse_url( $maybe_relative_path ) ) {

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 URL's 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'];

}

return $absolute_path . '/' . ltrim( $path, '/' );

}

/**

* Handles HTTP Redirects and follows them 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 false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.

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;

}

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