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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.
*
* <strong>http_transport_get_debug</strong> - gives working, nonblocking, and blocking transports.
*
* <strong>http_transport_post_debug</strong> - gives working, nonblocking, and blocking transports.
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
class WP_Http {
/**
* PHP4 style Constructor - Calls PHP5 Style Constructor
*
* @since 2.7.0
* @return WP_Http
*/
function WP_Http() {
$this->__construct();
}
/**
* PHP5 style Constructor - Set up available transport if not available.
*
* PHP4 does not have the 'self' keyword and since WordPress supports PHP4, the class needs to
* be used for the static call. The transport are set up to save time and will only be created
* once. This class can be created many times without having to go through the step of finding
* which transports are available.
*
* @since 2.7.0
* @return WP_Http
*/
function __construct() {
WP_Http::_getTransport();
WP_Http::_postTransport();
}
/**
* Tests the WordPress HTTP objects for an object to use and returns it.
*
* Tests all of the objects and returns the object that passes. Also caches that object to be
* used later.
*
* The order for the GET/HEAD requests are HTTP Extension, cURL, Streams, Fopen, and finally
* Fsockopen. fsockopen() is used last, because it has the most overhead in its implementation.
* There isn't any real way around it, since redirects have to be supported, much the same way
* the other transports also handle redirects.
*
* 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 2.7.0
* @access private
*
* @param array $args Request args, default us an empty array
* @return object|null Null if no transports are available, HTTP transport object.
*/
function &_getTransport( $args = array() ) {
static $working_transport, $blocking_transport, $nonblocking_transport;
if ( is_null($working_transport) ) {
if ( true === WP_Http_ExtHttp::test($args) ) {
$working_transport['exthttp'] = new WP_Http_ExtHttp();
$blocking_transport[] = &$working_transport['exthttp'];
} else if ( true === WP_Http_Curl::test($args) ) {
$working_transport['curl'] = new WP_Http_Curl();
$blocking_transport[] = &$working_transport['curl'];
} else if ( true === WP_Http_Streams::test($args) ) {
$working_transport['streams'] = new WP_Http_Streams();
$blocking_transport[] = &$working_transport['streams'];
} else if ( true === WP_Http_Fopen::test($args) ) {
$working_transport['fopen'] = new WP_Http_Fopen();
$blocking_transport[] = &$working_transport['fopen'];
} else if ( true === WP_Http_Fsockopen::test($args) ) {
$working_transport['fsockopen'] = new WP_Http_Fsockopen();
$blocking_transport[] = &$working_transport['fsockopen'];
}
foreach ( array('curl', 'streams', 'fopen', 'fsockopen', 'exthttp') as $transport ) {
if ( isset($working_transport[$transport]) )
$nonblocking_transport[] = &$working_transport[$transport];
}
}
do_action( 'http_transport_get_debug', $working_transport, $blocking_transport, $nonblocking_transport );
if ( isset($args['blocking']) && !$args['blocking'] )
return $nonblocking_transport;
else
return $blocking_transport;
}
/**
* Tests the WordPress HTTP objects for an object to use and returns it.
*
* Tests all of the objects and returns the object that passes. Also caches
* that object to be used later. This is for posting content to a URL and
* is used when there is a body. The plain Fopen Transport can not be used
* to send content, but the streams transport can. This is a limitation that
* is addressed here, by just not including that transport.
*
* @since 2.7.0
* @access private
*
* @param array $args Request args, default us an empty array
* @return object|null Null if no transports are available, HTTP transport object.
*/
function &_postTransport( $args = array() ) {
static $working_transport, $blocking_transport, $nonblocking_transport;
if ( is_null($working_transport) ) {
if ( true === WP_Http_ExtHttp::test($args) ) {
$working_transport['exthttp'] = new WP_Http_ExtHttp();
$blocking_transport[] = &$working_transport['exthttp'];
} else if ( true === WP_Http_Curl::test($args) ) {
$working_transport['curl'] = new WP_Http_Curl();
$blocking_transport[] = &$working_transport['curl'];
} else if ( true === WP_Http_Streams::test($args) ) {
$working_transport['streams'] = new WP_Http_Streams();
$blocking_transport[] = &$working_transport['streams'];
} else if ( true === WP_Http_Fsockopen::test($args) ) {
$working_transport['fsockopen'] = new WP_Http_Fsockopen();
$blocking_transport[] = &$working_transport['fsockopen'];
}
foreach ( array('curl', 'streams', 'fsockopen', 'exthttp') as $transport ) {
if ( isset($working_transport[$transport]) )
$nonblocking_transport[] = &$working_transport[$transport];
}
}
do_action( 'http_transport_post_debug', $working_transport, $blocking_transport, $nonblocking_transport );
if ( isset($args['blocking']) && !$args['blocking'] )
return $nonblocking_transport;
else
return $blocking_transport;
}
/**
* 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 containing 'headers', 'body', 'response', 'cookies'
*/
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
);
$r = wp_parse_args( $args, $defaults );
$r = apply_filters( 'http_request_args', $r, $url );
// 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( $url ) || empty($url['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 ( 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() )
$r['headers']['Accept-Encoding'] = WP_Http_Encoding::accept_encoding();
if ( empty($r['body']) ) {
// Some servers fail when sending content without the content-length header being set.
// Also, to fix another bug, we only send when doing POST and PUT and the content-length
// header isn't already set.
if( ($r['method'] == 'POST' || $r['method'] == 'PUT') && ! isset($r['headers']['Content-Length']) )
$r['headers']['Content-Length'] = 0;
// The method is ambiguous, because we aren't talking about HTTP methods, the "get" in
// this case is simply that we aren't sending any bodies and to get the transports that
// don't support sending bodies along with those which do.
$transports = WP_Http::_getTransport($r);
} else {
if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {
if ( ! version_compare(phpversion(), '5.1.2', '>=') )
$r['body'] = _http_build_query($r['body'], null, '&');
else
$r['body'] = http_build_query($r['body'], null, '&');
$r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option('blog_charset');
$r['headers']['Content-Length'] = strlen($r['body']);
}
if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) )
$r['headers']['Content-Length'] = strlen($r['body']);
// The method is ambiguous, because we aren't talking about HTTP methods, the "post" in
// this case is simply that we are sending HTTP body and to get the transports that do
// support sending the body. Not all do, depending on the limitations of the PHP core
// limitations.
$transports = WP_Http::_postTransport($r);
}
do_action( 'http_api_debug', $transports, 'transports_list' );
$response = array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
foreach ( (array) $transports as $transport ) {
$response = $transport->request($url, $r);
do_action( 'http_api_debug', $response, 'response', get_class($transport) );
if ( ! is_wp_error($response) )
return apply_filters( 'http_response', $response, $r, $url );
}
return $response;
}
/**
* 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 $args Optional. Override the defaults.
* @return boolean
*/
function post($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 $args Optional. Override the defaults.
* @return boolean
*/
function get($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 $args Optional. Override the defaults.
* @return boolean
*/
function head($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", $strResponse, 2);
return array('headers' => isset($res[0]) ? $res[0] : array(), 'body' => isset($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 $headers
* @return array Processed string headers. If duplicate headers are encountered,
* Then a numbered array is returned as the value of that header-key.
*/
function processHeaders($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 ( $headers as $tempheader ) {
if ( empty($tempheader) )
continue;
if ( false === strpos($tempheader, ':') ) {
list( , $response['code'], $response['message']) = explode(' ', $tempheader, 3);
continue;
}
list($key, $value) = explode(':', $tempheader, 2);
if ( !empty( $value ) ) {
$key = strtolower( $key );
if ( isset( $newheaders[$key] ) ) {
if ( !is_array($newheaders[$key]) )
$newheaders[$key] = array($newheaders[$key]);
$newheaders[$key][] = trim( $value );
} else {
$newheaders[$key] = trim( $value );
}
if ( 'set-cookie' == strtolower( $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 $r Full array of args passed into ::request()
*/
function buildCookieHeader( &$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.
*
* @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.
*
* @since 2.8.0
* @link http://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
*
* @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;
if ( null == $accessible_hosts )
$accessible_hosts = preg_split('|,\s*|', WP_ACCESSIBLE_HOSTS);
return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If its in the array, then we can't access it.
}
}
/**
* 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 $args Optional. Override the defaults.
* @return array 'headers', 'body', 'cookies' and 'response' keys.
*/
function request($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 should'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() );
}
$strResponse = '';
while ( ! feof($handle) )
$strResponse .= fread($handle, 4096);
fclose($handle);
if ( true === $secure_transport )
error_reporting($error_reporting);
$process = WP_Http::processResponse($strResponse);
$arrHeaders = WP_Http::processHeaders($process['headers']);
// Is the response code within the 400 range?
if ( (int) $arrHeaders['response']['code'] >= 400 && (int) $arrHeaders['response']['code'] < 500 )
return new WP_Error('http_request_failed', $arrHeaders['response']['code'] . ': ' . $arrHeaders['response']['message']);
// If location is found, then assume redirect and redirect to location.
if ( 'HEAD' != $r['method'] && isset($arrHeaders['headers']['location']) ) {
if ( $r['redirection']-- > 0 ) {
return $this->request($arrHeaders['headers']['location'], $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']);
}
/**
* 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.
*/
function test( $args = array() ) {
if ( false !== ($option = get_option( 'disable_fsockopen' )) && time()-$option < 43200 ) // 12 hours
return false;
$is_ssl = isset($args['ssl']) && $args['ssl'];
if ( ! $is_ssl && function_exists( 'fsockopen' ) )
$use = true;
elseif ( $is_ssl && extension_loaded('openssl') && function_exists( 'fsockopen' ) )
$use = true;
else
$use = false;
return apply_filters('use_fsockopen_transport', $use, $args);
}
}
/**
* HTTP request method uses fopen function to retrieve the url.
*
* Requires PHP version greater than 4.3.0 for stream support. Does not allow for $context support,
* but should still be okay, to write the headers, before getting the response. Also requires that
* 'allow_url_fopen' to be enabled.
*
* @package WordPress
* @subpackage HTTP
* @since 2.7.0
*/
class WP_Http_Fopen {
/**
* Send a HTTP request to a URI using fopen().
*
* This transport does not support sending of headers and body, therefore should not be used in
* the instances, where there is a body and headers.
*
* Notes: Does not support non-blocking mode. Ignores 'redirection' option.
*
* @see WP_Http::retrieve For default options descriptions.
*
* @access public
* @since 2.7.0
*
* @param string $url URI resource.
* @param str|array $args Optional. Override the defaults.
* @return array 'headers', 'body', 'cookies' and 'response' keys.
*/
function request($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 );
$arrURL = parse_url($url);
if ( false === $arrURL )
return new WP_Error('http_request_failed', sprintf(__('Malformed URL: %s'), $url));
if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
$url = str_replace($arrURL['scheme'], 'http', $url);
if ( is_null( $r['headers'] ) )
$r['headers'] = array();
if ( is_string($r['headers']) ) {
$processedHeaders = WP_Http::processHeaders($r['headers']);
$r['headers'] = $processedHeaders['headers'];
}
$initial_user_agent = ini_get('user_agent');
if ( !empty($r['headers']) && is_array($r['headers']) ) {
$user_agent_extra_headers = '';
foreach ( $r['headers'] as $header => $value )
$user_agent_extra_headers .= "\r\n$header: $value";
@ini_set('user_agent', $r['user-agent'] . $user_agent_extra_headers);
} else {
@ini_set('user_agent', $r['user-agent']);
}
if ( !WP_DEBUG )
$handle = @fopen($url, 'r');
else
$handle = fopen($url, 'r');
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 ( ! $r['blocking'] ) {
fclose($handle);
@ini_set('user_agent', $initial_user_agent); //Clean up any extra headers added
return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
}
$strResponse = '';
while ( ! feof($handle) )
$strResponse .= fread($handle, 4096);
if ( function_exists('stream_get_meta_data') ) {
$meta = stream_get_meta_data($handle);
$theHeaders = $meta['wrapper_data'];
if ( isset( $meta['wrapper_data']['headers'] ) )
$theHeaders = $meta['wrapper_data']['headers'];
} else {
//$http_response_header is a PHP reserved variable which is set in the current-scope when using the HTTP Wrapper
//see http://php.oregonstate.edu/manual/en/reserved.variables.httpresponseheader.php
$theHeaders = $http_response_header;
}
fclose($handle);
@ini_set('user_agent', $initial_user_agent); //Clean up any extra headers added
$processedHeaders = WP_Http::processHeaders($theHeaders);
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' => $processedHeaders['cookies']);
}
/**
* Whether this class can be used for retrieving an URL.
*
* @since 2.7.0
* @static
* @return boolean False means this class can not be used, true means it can.
*/
function test($args = array()) {
if ( ! function_exists('fopen') || (function_exists('ini_get') && true != ini_get('allow_url_fopen')) )
return false;
if ( isset($args['method']) && 'HEAD' == $args['method'] ) //This transport cannot make a HEAD request
return false;
$use = true;
//PHP does not verify SSL certs, We can only make a request via this transports if SSL Verification is turned off.
$is_ssl = isset($args['ssl']) && $args['ssl'];
if ( $is_ssl ) {
$is_local = isset($args['local']) && $args['local'];
$ssl_verify = isset($args['sslverify']) && $args['sslverify'];
if ( $is_local && true != apply_filters('https_local_ssl_verify', true) )
$use = true;
elseif ( !$is_local && true != apply_filters('https_ssl_verify', true) )
$use = true;
elseif ( !$ssl_verify )
$use = true;
else
$use = false;
}
return apply_filters('use_fopen_transport', $use, $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 $args Optional. Override the defaults.
* @return array 'headers', 'body', 'cookies' and 'response' keys.
*/
function request($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'];