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class-http.php
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<?php
/**
* Simple and uniform 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.
*
* @link http://trac.wordpress.org/ticket/4779 HTTP API Proposal
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
/**
* WordPress HTTP Class for managing HTTP Transports and making HTTP requests.
*
* This class is called for the functionality of making HTTP requests and replaces Snoopy
* functionality. There is no available functionality to add HTTP transport implementations, since
* most of the HTTP transports are added and available for use.
*
* There are no properties, because none are needed and for performance reasons. Some of the
* functions are static and while they do have some overhead over functions in PHP4, the purpose is
* maintainability. When PHP5 is finally the requirement, it will be easy to add the static keyword
* to the code. It is not as easy to convert a function to a method after enough code uses the old
* way.
*
* Debugging includes several actions, which pass different variables for debugging the HTTP API.
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
class WP_Http {
/**
* Send a HTTP request to a URI.
*
* The body and headers are part of the arguments. The 'body' argument is for the body and will
* accept either a string or an array. The 'headers' argument should be an array, but a string
* is acceptable. If the 'body' argument is an array, then it will automatically be escaped
* using http_build_query().
*
* The only URI that are supported in the HTTP Transport implementation are the HTTP and HTTPS
* protocols. HTTP and HTTPS are assumed so the server might not know how to handle the send
* headers. Other protocols are unsupported and most likely will fail.
*
* The defaults are 'method', 'timeout', 'redirection', 'httpversion', 'blocking' and
* 'user-agent'.
*
* Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports technically allow
* others, but should not be assumed. The 'timeout' is used to sent how long the connection
* should stay open before failing when no response. 'redirection' is used to track how many
* redirects were taken and used to sent the amount for other transports, but not all transports
* accept setting that value.
*
* The 'httpversion' option is used to sent the HTTP version and accepted values are '1.0', and
* '1.1' and should be a string. Version 1.1 is not supported, because of chunk response. The
* 'user-agent' option is the user-agent and is used to replace the default user-agent, which is
* 'WordPress/WP_Version', where WP_Version is the value from $wp_version.
*
* 'blocking' is the default, which is used to tell the transport, whether it should halt PHP
* while it performs the request or continue regardless. Actually, that isn't entirely correct.
* Blocking mode really just means whether the fread should just pull what it can whenever it
* gets bytes or if it should wait until it has enough in the buffer to read or finishes reading
* the entire content. It doesn't actually always mean that PHP will continue going after making
* the request.
*
* @access public
* @since 2.7.0
* @todo Refactor this code. The code in this method extends the scope of its original purpose
* and should be refactored to allow for cleaner abstraction and reduce duplication of the
* code. One suggestion is to create a class specifically for the arguments, however
* preliminary refactoring to this affect has affect more than just the scope of the
* arguments. Something to ponder at least.
*
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
*/
function request( $url, $args = array() ) {
global $wp_version;
$defaults = array(
'method' => 'GET',
'timeout' => apply_filters( 'http_request_timeout', 5),
'redirection' => apply_filters( 'http_request_redirection_count', 5),
'httpversion' => apply_filters( 'http_request_version', '1.0'),
'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),
'blocking' => true,
'headers' => array(),
'cookies' => array(),
'body' => null,
'compress' => false,
'decompress' => true,
'sslverify' => true,
'stream' => false,
'filename' => 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 );
$r = apply_filters( 'http_request_args', $r, $url );
// Certain classes decrement this, store a copy of the original value for loop purposes.
$r['_redirection'] = $r['redirection'];
// Allow plugins to short-circuit the request
$pre = apply_filters( 'pre_http_request', false, $r, $url );
if ( false !== $pre )
return $pre;
$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.' ) );
// Determine if this is a https call and pass that on to the transport functions
// so that we can blacklist the transports that do not support ssl verification
$r['ssl'] = $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl';
// Determine if this request is to OUR install of WordPress
$homeURL = parse_url( get_bloginfo( 'url' ) );
$r['local'] = $homeURL['host'] == $arrURL['host'] || 'localhost' == $arrURL['host'];
unset( $homeURL );
// 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'] && 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
if ( $r['stream'] ) {
$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();
if ( ! is_array( $r['headers'] ) ) {
$processedHeaders = WP_Http::processHeaders( $r['headers'] );
$r['headers'] = $processedHeaders['headers'];
}
if ( isset( $r['headers']['User-Agent'] ) ) {
$r['user-agent'] = $r['headers']['User-Agent'];
unset( $r['headers']['User-Agent'] );
}
if ( isset( $r['headers']['user-agent'] ) ) {
$r['user-agent'] = $r['headers']['user-agent'];
unset( $r['headers']['user-agent'] );
}
// Construct Cookie: header if any cookies are set
WP_Http::buildCookieHeader( $r );
if ( WP_Http_Encoding::is_available() )
$r['headers']['Accept-Encoding'] = WP_Http_Encoding::accept_encoding();
if ( ( ! is_null( $r['body'] ) && '' != $r['body'] ) || 'POST' == $r['method'] || 'PUT' == $r['method'] ) {
if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {
$r['body'] = http_build_query( $r['body'], null, '&' );
if ( ! isset( $r['headers']['Content-Type'] ) )
$r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' );
}
if ( '' === $r['body'] )
$r['body'] = null;
if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) )
$r['headers']['Content-Length'] = strlen( $r['body'] );
}
return $this->_dispatch_request($url, $r);
}
/**
* Tests which transports are capable of supporting the request.
*
* @since 3.2.0
* @access private
*
* @param array $args Request arguments
* @param string $url URL to Request
*
* @return string|bool 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 ) {
$request_order = array( 'curl', 'streams', 'fsockopen' );
// Loop over each transport on each HTTP request looking for one which will serve this request's needs
foreach ( $request_order as $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 blocking requests is cURL, Streams, and finally Fsockopen.
* The order for non-blocking requests is cURL, Streams and Fsockopen().
*
* There are currently issues with "localhost" not resolving correctly with DNS. This may cause
* an error "failed to open stream: A connection attempt failed because the connected party did
* not properly respond after a period of time, or established connection failed because [the]
* connected host has failed to respond."
*
* @since 3.2.0
* @access private
*
* @param string $url URL to Request
* @param array $args Request arguments
* @return array|object 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 );
do_action( 'http_api_debug', $response, 'response', $class, $args, $url );
if ( is_wp_error( $response ) )
return $response;
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.
*
* @access public
* @since 2.7.0
*
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
*/
function post($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.
*
* @access public
* @since 2.7.0
*
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
*/
function get($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.
*
* @access public
* @since 2.7.0
*
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array|object Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
*/
function head($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.
*
* @access public
* @static
* @since 2.7.0
*
* @param string $strResponse The full response string
* @return array Array with 'headers' and 'body' keys.
*/
function processResponse($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.
*
* @access public
* @static
* @since 2.7.0
*
* @param string|array $headers
* @return array Processed string headers. If duplicate headers are encountered,
* Then a numbered array is returned as the value of that header-key.
*/
public static function processHeaders($headers) {
// 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 );
}
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's assumed to contain WP_Http_Cookie objects, which are each parsed
* into strings and added to the Cookie: header (within the arguments array). Edits the array by
* reference.
*
* @access public
* @version 2.8.0
* @static
*
* @param array $r Full array of args passed into ::request()
*/
public static function buildCookieHeader( &$r ) {
if ( ! empty($r['cookies']) ) {
$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. Does not support UTF-8. Does not support
* returning footer headers. Shouldn't be too difficult to support it though.
*
* @link http://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.
*
* @todo Add support for footer chunked headers.
* @access public
* @since 2.7.0
* @static
*
* @param string $body Body content
* @return string Chunked decoded body on success or raw body on failure.
*/
function chunkTransferDecode($body) {
$body = str_replace(array("\r\n", "\r"), "\n", $body);
// The body is not chunked encoding or is malformed.
if ( ! preg_match( '/^[0-9a-f]+(\s|\n)+/mi', trim($body) ) )
return $body;
$parsedBody = '';
//$parsedHeaders = array(); Unsupported
while ( true ) {
$hasChunk = (bool) preg_match( '/^([0-9a-f]+)(\s|\n)+/mi', $body, $match );
if ( $hasChunk ) {
if ( empty( $match[1] ) )
return $body;
$length = hexdec( $match[1] );
$chunkLength = strlen( $match[0] );
$strBody = substr($body, $chunkLength, $length);
$parsedBody .= $strBody;
$body = ltrim(str_replace(array($match[0], $strBody), '', $body), "\n");
if ( "0" == trim($body) )
return $parsedBody; // Ignore footer headers.
} else {
return $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 blog 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 http://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
* @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS
*
* @param string $uri URI of url.
* @return bool True to block, false to allow.
*/
function block_request($uri) {
// We don't need to block requests, because nothing is blocked.
if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL )
return false;
// parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
// This will be displayed on blogs, which is not reasonable.
$check = @parse_url($uri);
/* Malformed URL, can not process, but this could mean ssl, so let through anyway.
*
* This isn't very security sound. There are instances where a hacker might attempt
* to bypass the proxy and this check. However, the reason for this behavior is that
* WordPress does not do any checking currently for non-proxy requests, so it is keeps with
* the default unsecure nature of the HTTP request.
*/
if ( $check === false )
return false;
$home = parse_url( get_option('siteurl') );
// Don't block requests back to ourselves by default
if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )
return apply_filters('block_local_requests', false);
if ( !defined('WP_ACCESSIBLE_HOSTS') )
return true;
static $accessible_hosts;
static $wildcard_regex = false;
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 )
$wildcard_regex[] = str_replace('\*', '[\w.]+?', preg_quote($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.
}
static function make_absolute_url( $maybe_relative_path, $url ) {
if ( empty( $url ) )
return $maybe_relative_path;
// Check for a scheme
if ( false !== strpos( $maybe_relative_path, '://' ) )
return $maybe_relative_path;
if ( ! $url_parts = @parse_url( $url ) )
return $maybe_relative_path;
if ( ! $relative_url_parts = @parse_url( $maybe_relative_path ) )
return $maybe_relative_path;
$absolute_path = $url_parts['scheme'] . '://' . $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, '/' );
}
}
/**
* HTTP request method uses fsockopen function to retrieve the url.
*
* This would be the preferred method, but the fsockopen implementation has the most overhead of all
* the HTTP transport implementations.
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
class WP_Http_Fsockopen {
/**
* Send a HTTP request to a URI using fsockopen().
*
* Does not support non-blocking mode.
*
* @see WP_Http::request For default options descriptions.
*
* @since 2.7
* @access public
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys.
*/
function request($url, $args = array()) {
$defaults = array(
'method' => 'GET', 'timeout' => 5,
'redirection' => 5, 'httpversion' => '1.0',
'blocking' => true,
'headers' => array(), 'body' => null, 'cookies' => array()
);
$r = wp_parse_args( $args, $defaults );
if ( isset($r['headers']['User-Agent']) ) {
$r['user-agent'] = $r['headers']['User-Agent'];
unset($r['headers']['User-Agent']);
} else if ( isset($r['headers']['user-agent']) ) {
$r['user-agent'] = $r['headers']['user-agent'];
unset($r['headers']['user-agent']);
}
// Construct Cookie: header if any cookies are set
WP_Http::buildCookieHeader( $r );
$iError = null; // Store error number
$strError = null; // Store error string
$arrURL = parse_url($url);
$fsockopen_host = $arrURL['host'];
$secure_transport = false;
if ( ! isset( $arrURL['port'] ) ) {
if ( ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) && extension_loaded('openssl') ) {
$fsockopen_host = "ssl://$fsockopen_host";
$arrURL['port'] = 443;
$secure_transport = true;
} else {
$arrURL['port'] = 80;
}
}
//fsockopen has issues with 'localhost' with IPv6 with certain versions of PHP, It attempts to connect to ::1,
// which fails when the server is not set up for it. For compatibility, always connect to the IPv4 address.
if ( 'localhost' == strtolower($fsockopen_host) )
$fsockopen_host = '127.0.0.1';
// There are issues with the HTTPS and SSL protocols that cause errors that can be safely
// ignored and should be ignored.
if ( true === $secure_transport )
$error_reporting = error_reporting(0);
$startDelay = time();
$proxy = new WP_HTTP_Proxy();
if ( !WP_DEBUG ) {
if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
$handle = @fsockopen( $proxy->host(), $proxy->port(), $iError, $strError, $r['timeout'] );
else
$handle = @fsockopen( $fsockopen_host, $arrURL['port'], $iError, $strError, $r['timeout'] );
} else {
if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
$handle = fsockopen( $proxy->host(), $proxy->port(), $iError, $strError, $r['timeout'] );
else
$handle = fsockopen( $fsockopen_host, $arrURL['port'], $iError, $strError, $r['timeout'] );
}
$endDelay = time();
// If the delay is greater than the timeout then fsockopen shouldn't be used, because it will
// cause a long delay.
$elapseDelay = ($endDelay-$startDelay) > $r['timeout'];
if ( true === $elapseDelay )
add_option( 'disable_fsockopen', $endDelay, null, true );
if ( false === $handle )
return new WP_Error('http_request_failed', $iError . ': ' . $strError);
$timeout = (int) floor( $r['timeout'] );
$utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
stream_set_timeout( $handle, $timeout, $utimeout );
if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.
$requestPath = $url;
else
$requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );
if ( empty($requestPath) )
$requestPath .= '/';
$strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";
if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )
$strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";
else
$strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";
if ( isset($r['user-agent']) )
$strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";
if ( is_array($r['headers']) ) {
foreach ( (array) $r['headers'] as $header => $headerValue )
$strHeaders .= $header . ': ' . $headerValue . "\r\n";
} else {
$strHeaders .= $r['headers'];
}
if ( $proxy->use_authentication() )
$strHeaders .= $proxy->authentication_header() . "\r\n";
$strHeaders .= "\r\n";
if ( ! is_null($r['body']) )
$strHeaders .= $r['body'];
fwrite($handle, $strHeaders);
if ( ! $r['blocking'] ) {
fclose($handle);
return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
}
$strResponse = '';
$bodyStarted = false;
// If streaming to a file setup the file handle
if ( $r['stream'] ) {
if ( ! WP_DEBUG )
$stream_handle = @fopen( $r['filename'], 'w+' );
else
$stream_handle = fopen( $r['filename'], 'w+' );
if ( ! $stream_handle )
return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
while ( ! feof($handle) ) {
$block = fread( $handle, 4096 );
if ( $bodyStarted ) {
fwrite( $stream_handle, $block );
} else {
$strResponse .= $block;
if ( strpos( $strResponse, "\r\n\r\n" ) ) {
$process = WP_Http::processResponse( $strResponse );
$bodyStarted = true;
fwrite( $stream_handle, $process['body'] );
unset( $strResponse );
$process['body'] = '';
}
}
}
fclose( $stream_handle );
} else {
while ( ! feof($handle) )
$strResponse .= fread( $handle, 4096 );
$process = WP_Http::processResponse( $strResponse );
unset( $strResponse );
}
fclose( $handle );
if ( true === $secure_transport )
error_reporting($error_reporting);
$arrHeaders = WP_Http::processHeaders( $process['headers'] );
// If location is found, then assume redirect and redirect to location.
if ( isset($arrHeaders['headers']['location']) && 0 !== $r['_redirection'] ) {
if ( $r['redirection']-- > 0 ) {
return $this->request( WP_HTTP::make_absolute_url( $arrHeaders['headers']['location'], $url ), $r);
} else {
return new WP_Error('http_request_failed', __('Too many redirects.'));
}
}
// If the body was chunk encoded, then decode it.
if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )
$process['body'] = WP_Http::chunkTransferDecode($process['body']);
if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )
$process['body'] = WP_Http_Encoding::decompress( $process['body'] );
return array( 'headers' => $arrHeaders['headers'], 'body' => $process['body'], 'response' => $arrHeaders['response'], 'cookies' => $arrHeaders['cookies'], 'filename' => $r['filename'] );
}
/**
* Whether this class can be used for retrieving an URL.
*
* @since 2.7.0
* @static
* @return boolean False means this class can not be used, true means it can.
*/
public static function test( $args = array() ) {
if ( ! function_exists( 'fsockopen' ) )
return false;
if ( false !== ( $option = get_option( 'disable_fsockopen' ) ) && time() - $option < 12 * HOUR_IN_SECONDS )
return false;
$is_ssl = isset( $args['ssl'] ) && $args['ssl'];
if ( $is_ssl && ! extension_loaded( 'openssl' ) )
return false;
return apply_filters( 'use_fsockopen_transport', true, $args );
}
}
/**
* HTTP request method uses Streams to retrieve the url.
*
* Requires PHP 5.0+ and uses fopen with stream context. Requires that 'allow_url_fopen' PHP setting
* to be enabled.
*
* Second preferred method for getting the URL, for PHP 5.
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
class WP_Http_Streams {
/**
* Send a HTTP request to a URI using streams with fopen().
*
* @access public
* @since 2.7.0
*
* @param string $url
* @param str|array $args Optional. Override the defaults.
* @return array 'headers', 'body', 'response', 'cookies' and 'filename' keys.
*/
function request($url, $args = array()) {
$defaults = array(
'method' => 'GET', 'timeout' => 5,
'redirection' => 5, 'httpversion' => '1.0',
'blocking' => true,
'headers' => array(), 'body' => null, 'cookies' => array()
);
$r = wp_parse_args( $args, $defaults );
if ( isset($r['headers']['User-Agent']) ) {
$r['user-agent'] = $r['headers']['User-Agent'];
unset($r['headers']['User-Agent']);
} else if ( isset($r['headers']['user-agent']) ) {
$r['user-agent'] = $r['headers']['user-agent'];
unset($r['headers']['user-agent']);
}
// Construct Cookie: header if any cookies are set
WP_Http::buildCookieHeader( $r );
$arrURL = parse_url($url);
if ( false === $arrURL )
return new WP_Error('http_request_failed', sprintf(__('Malformed URL: %s'), $url));
if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
$url = preg_replace('|^' . preg_quote($arrURL['scheme'], '|') . '|', 'http', $url);
// Convert Header array to string.
$strHeaders = '';
if ( is_array( $r['headers'] ) )
foreach ( $r['headers'] as $name => $value )
$strHeaders .= "{$name}: $value\r\n";
else if ( is_string( $r['headers'] ) )
$strHeaders = $r['headers'];
$is_local = isset($args['local']) && $args['local'];
$ssl_verify = isset($args['sslverify']) && $args['sslverify'];
if ( $is_local )
$ssl_verify = apply_filters('https_local_ssl_verify', $ssl_verify);
elseif ( ! $is_local )
$ssl_verify = apply_filters('https_ssl_verify', $ssl_verify);
$arrContext = array('http' =>
array(
'method' => strtoupper($r['method']),
'user_agent' => $r['user-agent'],
'max_redirects' => $r['redirection'] + 1, // See #11557
'protocol_version' => (float) $r['httpversion'],
'header' => $strHeaders,
'ignore_errors' => true, // Return non-200 requests.
'timeout' => $r['timeout'],
'ssl' => array(
'verify_peer' => $ssl_verify,
'verify_host' => $ssl_verify
)
)
);
$proxy = new WP_HTTP_Proxy();
if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
$arrContext['http']['proxy'] = 'tcp://' . $proxy->host() . ':' . $proxy->port();
$arrContext['http']['request_fulluri'] = true;
// We only support Basic authentication so this will only work if that is what your proxy supports.
if ( $proxy->use_authentication() )
$arrContext['http']['header'] .= $proxy->authentication_header() . "\r\n";
}
if ( ! is_null( $r['body'] ) )
$arrContext['http']['content'] = $r['body'];
$context = stream_context_create($arrContext);
if ( !WP_DEBUG )
$handle = @fopen($url, 'r', false, $context);
else
$handle = fopen($url, 'r', false, $context);
if ( ! $handle )
return new WP_Error('http_request_failed', sprintf(__('Could not open handle for fopen() to %s'), $url));
$timeout = (int) floor( $r['timeout'] );
$utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;
stream_set_timeout( $handle, $timeout, $utimeout );
if ( ! $r['blocking'] ) {
stream_set_blocking($handle, 0);
fclose($handle);
return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
}
if ( $r['stream'] ) {
if ( ! WP_DEBUG )
$stream_handle = @fopen( $r['filename'], 'w+' );
else
$stream_handle = fopen( $r['filename'], 'w+' );
if ( ! $stream_handle )
return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );
stream_copy_to_stream( $handle, $stream_handle );
fclose( $stream_handle );
$strResponse = '';
} else {
$strResponse = stream_get_contents( $handle );
}
$meta = stream_get_meta_data( $handle );
fclose( $handle );
$processedHeaders = array();
if ( isset( $meta['wrapper_data']['headers'] ) )
$processedHeaders = WP_Http::processHeaders($meta['wrapper_data']['headers']);
else
$processedHeaders = WP_Http::processHeaders($meta['wrapper_data']);
// Streams does not provide an error code which we can use to see why the request stream stopped.
// We can however test to see if a location header is present and return based on that.
if ( isset($processedHeaders['headers']['location']) && 0 !== $args['_redirection'] )
return new WP_Error('http_request_failed', __('Too many redirects.'));
if ( ! empty( $strResponse ) && isset( $processedHeaders['headers']['transfer-encoding'] ) && 'chunked' == $processedHeaders['headers']['transfer-encoding'] )
$strResponse = WP_Http::chunkTransferDecode($strResponse);
if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($processedHeaders['headers']) )
$strResponse = WP_Http_Encoding::decompress( $strResponse );
return array( 'headers' => $processedHeaders['headers'], 'body' => $strResponse, 'response' => $processedHeaders['response'], 'cookies' => $processedHeaders['cookies'], 'filename' => $r['filename'] );
}
/**
* Whether this class can be used for retrieving an URL.
*
* @static
* @access public
* @since 2.7.0
*
* @return boolean False means this class can not be used, true means it can.
*/
public static function test( $args = array() ) {
if ( ! function_exists( 'fopen' ) )
return false;
if ( ! function_exists( 'ini_get' ) || true != ini_get( 'allow_url_fopen' ) )
return false;
$is_ssl = isset( $args['ssl'] ) && $args['ssl'];
if ( $is_ssl && ! extension_loaded( 'openssl' ) )
return false;
return apply_filters( 'use_streams_transport', true, $args );
}
}