<?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 {

	/**
	 * 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'. 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 it's 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 ( ! 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 ( empty($r['body']) ) {
			$r['body'] = null;
			// Some servers fail when sending content without the content-length header being set.
			// Also, to fix another bug, we only send when doing POST and PUT and the content-length
			// header isn't already set.
			if ( ($r['method'] == 'POST' || $r['method'] == 'PUT') && ! isset( $r['headers']['Content-Length'] ) )
				$r['headers']['Content-Length'] = 0;
		} else {
			if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {
				$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'] );
		}

		return $this->_dispatch_request($url, $r);
	}

	/**
	 * Dispatches a HTTP request to a supporting transport.
	 *
	 * Tests each transport in order to find a transport which matches the request arguements.
	 * Also caches the transport instance to be used later.
	 *
	 * The order for blocking requests is HTTP Extension, cURL, Streams, and finally Fsockopen.
	 * The order for non-blocking requests is cURL, Streams, Fsockopen() and finally, HTTP Extension.
	 * The HTTP Extension does not support non-blocking requests, but is included as a final resort.
	 *
	 * 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 $args Request arguments
	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies'. A WP_Error instance upon error
	 */
	private function _dispatch_request($url, $args) {
		static $transports = array();

		$request_order = isset($args['blocking']) && !$args['blocking'] ?
							array('curl', 'streams', 'fsockopen', 'exthttp') : // non-blocking order
							array('exthttp', 'curl', 'streams', 'fsockopen'); // blocking order

		// Loop over each transport on each HTTP request looking for one which will serve this requests 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;

			// Transport claims to support request, Instantate it and give it a whirl.
			if ( empty( $transports[ $transport ] ) )
				$transports[ $transport ] = new $class;

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

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

			if ( is_wp_error( $response ) )
				return $response;

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

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

	/**
	 * 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 $args Optional. Override the defaults.
	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies'. A WP_Error instance upon error
	 */
	function post($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 $args Optional. Override the defaults.
	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies'. A WP_Error instance upon error
	 */
	function get($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 $args Optional. Override the defaults.
	 * @return array|object Array containing 'headers', 'body', 'response', 'cookies'. A WP_Error instance upon error
	 */
	function head($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 $headers
	 * @return array Processed string headers. If duplicate headers are encountered,
	 * 					Then a numbered array is returned as the value of that header-key.
	 */
	function processHeaders($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);

			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' == $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, 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 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 = '';
		$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 $this->request($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'], '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.
	 */
	function test( $args = array() ) {
		if ( ! function_exists( 'fsockopen' ) )
			return false;

		if ( false !== ($option = get_option( 'disable_fsockopen' )) && time()-$option < 43200 ) // 12 hours
			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 $args Optional. Override the defaults.
	 * @return array 'headers', 'body', 'cookies' and 'response' keys.
	 */
	function request($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'];
		$ssl_verify = isset($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 ( ! empty($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 stoped. 
		// 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.
	 */
	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 );
	}
}

/**
 * HTTP request method uses HTTP extension to retrieve the url.
 *
 * Requires the HTTP extension to be installed. This would be the preferred transport since it can
 * handle a lot of the problems that forces the others to use the HTTP version 1.0. Even if PHP 5.2+
 * is being used, it doesn't mean that the HTTP extension will be enabled.
 *
 * @package WordPress
 * @subpackage HTTP
 * @since 2.7.0
 */
class WP_Http_ExtHttp {
	/**
	 * Send a HTTP request to a URI using HTTP extension.
	 *
	 * Does not support non-blocking.
	 *
	 * @access public
	 * @since 2.7
	 *
	 * @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 );

		switch ( $r['method'] ) {
			case 'POST':
				$r['method'] = HTTP_METH_POST;
				break;
			case 'HEAD':
				$r['method'] = HTTP_METH_HEAD;
				break;
			case 'PUT':
				$r['method'] =  HTTP_METH_PUT;
				break;
			case 'GET':
			default:
				$r['method'] = HTTP_METH_GET;
		}

		$arrURL = parse_url($url);

		if ( 'http' != $arrURL['scheme'] && 'https' != $arrURL['scheme'] )
			$url = preg_replace('|^' . preg_quote($arrURL['scheme'], '|') . '|', 'http', $url);

		$is_local = isset($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);

		$r['timeout'] = (int) ceil( $r['timeout'] );

		$options = array(
			'timeout' => $r['timeout'],
			'connecttimeout' => $r['timeout'],
			'redirect' => $r['redirection'],
			'useragent' => $r['user-agent'],
			'headers' => $r['headers'],
			'ssl' => array(
				'verifypeer' => $ssl_verify,
				'verifyhost' => $ssl_verify
			)
		);

		// The HTTP extensions offers really easy proxy support.
		$proxy = new WP_HTTP_Proxy();

		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
			$options['proxyhost'] = $proxy->host();
			$options['proxyport'] = $proxy->port();
			$options['proxytype'] = HTTP_PROXY_HTTP;

			if ( $proxy->use_authentication() ) {
				$options['proxyauth'] = $proxy->authentication();
				$options['proxyauthtype'] = HTTP_AUTH_ANY;
			}
		}

		if ( !WP_DEBUG ) //Emits warning level notices for max redirects and timeouts
			$strResponse = @http_request($r['method'], $url, $r['body'], $options, $info);
		else
			$strResponse = http_request($r['method'], $url, $r['body'], $options, $info); //Emits warning level notices for max redirects and timeouts

		// Error may still be set, Response may return headers or partial document, and error
		// contains a reason the request was aborted, eg, timeout expired or max-redirects reached.
		if ( false === $strResponse || ! empty($info['error']) )
			return new WP_Error('http_request_failed', $info['response_code'] . ': ' . $info['error']);

		if ( ! $r['blocking'] )
			return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );

		$headers_body = WP_HTTP::processResponse($strResponse);
		$theHeaders = $headers_body['headers'];
		$theBody = $headers_body['body'];
		unset($headers_body);

		$theHeaders = WP_Http::processHeaders($theHeaders);

		if ( ! empty( $theBody ) && isset( $theHeaders['headers']['transfer-encoding'] ) && 'chunked' == $theHeaders['headers']['transfer-encoding'] ) {
			if ( !WP_DEBUG )
				$theBody = @http_chunked_decode($theBody);
			else
				$theBody = http_chunked_decode($theBody);
		}

		if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )
			$theBody = http_inflate( $theBody );

		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'] ) );

			fwrite( $stream_handle, $theBody );
			fclose( $stream_handle );
			$theBody = '';
		}

		$theResponse = array();
		$theResponse['code'] = $info['response_code'];
		$theResponse['message'] = get_status_header_desc($info['response_code']);

		return array( 'headers' => $theHeaders['headers'], 'body' => $theBody, 'response' => $theResponse, 'cookies' => $theHeaders['cookies'], 'filename' => $r['filename'] );
	}

	/**
	 * Whether this class can be used for retrieving an URL.
	 *
	 * @static
	 * @since 2.7.0
	 *
	 * @return boolean False means this class can not be used, true means it can.
	 */
	function test($args = array()) {
		return apply_filters('use_http_extension_transport', function_exists('http_request'), $args );
	}
}

/**
 * HTTP request method uses Curl extension to retrieve the url.
 *
 * Requires the Curl extension to be installed.
 *
 * @package WordPress
 * @subpackage HTTP
 * @since 2.7
 */
class WP_Http_Curl {

	/**
	 * Temporary header storage for use with streaming to a file.
	 *
	 * @since 3.2.0
	 * @access private
	 * @var string
	 */
	private $headers = '';

	/**
	 * Send a HTTP request to a URI using cURL extension.
	 *
	 * @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 );

		$handle = curl_init();

		// cURL offers really easy proxy support.
		$proxy = new WP_HTTP_Proxy();

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

			curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );
			curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );
			curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );

			if ( $proxy->use_authentication() ) {
				curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );
				curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );
			}
		}

		$is_local = isset($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);


		// CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers.  Have to use ceil since
		// a value of 0 will allow an ulimited timeout.
		$timeout = (int) ceil( $r['timeout'] );
		curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );
		curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );

		curl_setopt( $handle, CURLOPT_URL, $url);
		curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );
		curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false );
		curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );
		curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] );
		curl_setopt( $handle, CURLOPT_MAXREDIRS, $r['redirection'] );

		switch ( $r['method'] ) {
			case 'HEAD':
				curl_setopt( $handle, CURLOPT_NOBODY, true );
				break;
			case 'POST':
				curl_setopt( $handle, CURLOPT_POST, true );
				curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
				break;
			case 'PUT':
				curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );
				curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );
				break;
		}

		if ( true === $r['blocking'] )
			curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( &$this, 'stream_headers' ) );

		curl_setopt( $handle, CURLOPT_HEADER, false );

		// If streaming to a file open a file handle, and setup our curl streaming handler
		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'] ) );
			curl_setopt( $handle, CURLOPT_FILE, $stream_handle );
		}

		// The option doesn't work with safe mode or when open_basedir is set.
		if ( !ini_get('safe_mode') && !ini_get('open_basedir') && 0 !== $r['_redirection'] )
			curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, true );

		if ( !empty( $r['headers'] ) ) {
			// cURL expects full header strings in each element
			$headers = array();
			foreach ( $r['headers'] as $name => $value ) {
				$headers[] = "{$name}: $value";
			}
			curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );
		}

		if ( $r['httpversion'] == '1.0' )
			curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );
		else
			curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );

		// Cookies are not handled by the HTTP API currently. Allow for plugin authors to handle it
		// themselves... Although, it is somewhat pointless without some reference.
		do_action_ref_array( 'http_api_curl', array(&$handle) );

		// We don't need to return the body, so don't. Just execute request and return.
		if ( ! $r['blocking'] ) {
			curl_exec( $handle );
			curl_close( $handle );
			return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );
		}

		$theResponse = curl_exec( $handle );
		$theBody = '';
		$theHeaders = WP_Http::processHeaders( $this->headers );

		if ( ! empty($theResponse) && ! is_bool( $theResponse ) ) // is_bool: when using $args['stream'], curl_exec will return (bool)true
			$theBody = $theResponse;

		// If no response, and It's not a HEAD request with valid headers returned
		if ( empty($theResponse) && ('HEAD' != $args['method'] || empty($this->headers)) ) {
			if ( $curl_error = curl_error($handle) )
				return new WP_Error('http_request_failed', $curl_error);
			if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array(301, 302) ) )
				return new WP_Error('http_request_failed', __('Too many redirects.'));
		}

		unset( $this->headers );

		$response = array();
		$response['code'] = curl_getinfo( $handle, CURLINFO_HTTP_CODE );
		$response['message'] = get_status_header_desc($response['code']);

		curl_close( $handle );

		if ( $r['stream'] )
			fclose( $stream_handle );

		// See #11305 - When running under safe mode, redirection is disabled above. Handle it manually.
		if ( ! empty( $theHeaders['headers']['location'] ) && ( ini_get( 'safe_mode' ) || ini_get( 'open_basedir' ) ) && 0 !== $r['_redirection'] ) {
			if ( $r['redirection']-- > 0 ) {
				return $this->request( $theHeaders['headers']['location'], $r );
			} else {
				return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
			}
		}

		if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )
			$theBody = WP_Http_Encoding::decompress( $theBody );

		return array( 'headers' => $theHeaders['headers'], 'body' => $theBody, 'response' => $response, 'cookies' => $theHeaders['cookies'], 'filename' => $r['filename'] );
	}

	/**
	 * Grab the headers of the cURL request
	 *
	 * Each header is sent individually to this callback, so we append to the $header property for temporary storage
	 *
	 * @since 3.2.0
	 * @access private
	 * @return int
	 */
	private function stream_headers( $handle, $headers ) {
		$this->headers .= $headers;
		return strlen( $headers );
	}

	/**
	 * Whether this class can be used for retrieving an URL.
	 *
	 * @static
	 * @since 2.7.0
	 *
	 * @return boolean False means this class can not be used, true means it can.
	 */
	function test( $args = array() ) {
		if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) )
			return false;

		$is_ssl = isset( $args['ssl'] ) && $args['ssl'];

		if ( $is_ssl ) {
			$curl_version = curl_version();
			if ( ! (CURL_VERSION_SSL & $curl_version['features']) ) // Does this cURL version support SSL requests?
				return false;
		}

		return apply_filters( 'use_curl_transport', true, $args );
	}
}

/**
 * Adds Proxy support to the WordPress HTTP API.
 *
 * There are caveats to proxy support. It requires that defines be made in the wp-config.php file to
 * enable proxy support. There are also a few filters that plugins can hook into for some of the
 * constants.
 *
 * Please note that only BASIC authentication is supported by most transports.
 * cURL and the PHP HTTP Extension MAY support more methods (such as NTLM authentication) depending on your environment.
 *
 * The constants are as follows:
 * <ol>
 * <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li>
 * <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li>
 * <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li>
 * <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li>
 * <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy.
 * You do not need to have localhost and the blog host in this list, because they will not be passed
 * through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org</li>
 * </ol>
 *
 * An example can be as seen below.
 * <code>
 * define('WP_PROXY_HOST', '192.168.84.101');
 * define('WP_PROXY_PORT', '8080');
 * define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org');
 * </code>
 *
 * @link http://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.
 * @link http://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS
 * @since 2.8
 */
class WP_HTTP_Proxy {

	/**
	 * Whether proxy connection should be used.
	 *
	 * @since 2.8
	 * @use WP_PROXY_HOST
	 * @use WP_PROXY_PORT
	 *
	 * @return bool
	 */
	function is_enabled() {
		return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT');
	}

	/**
	 * Whether authentication should be used.
	 *
	 * @since 2.8
	 * @use WP_PROXY_USERNAME
	 * @use WP_PROXY_PASSWORD
	 *
	 * @return bool
	 */
	function use_authentication() {
		return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD');
	}

	/**
	 * Retrieve the host for the proxy server.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function host() {
		if ( defined('WP_PROXY_HOST') )
			return WP_PROXY_HOST;

		return '';
	}

	/**
	 * Retrieve the port for the proxy server.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function port() {
		if ( defined('WP_PROXY_PORT') )
			return WP_PROXY_PORT;

		return '';
	}

	/**
	 * Retrieve the username for proxy authentication.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function username() {
		if ( defined('WP_PROXY_USERNAME') )
			return WP_PROXY_USERNAME;

		return '';
	}

	/**
	 * Retrieve the password for proxy authentication.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function password() {
		if ( defined('WP_PROXY_PASSWORD') )
			return WP_PROXY_PASSWORD;

		return '';
	}

	/**
	 * Retrieve authentication string for proxy authentication.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function authentication() {
		return $this->username() . ':' . $this->password();
	}

	/**
	 * Retrieve header string for proxy authentication.
	 *
	 * @since 2.8
	 *
	 * @return string
	 */
	function authentication_header() {
		return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );
	}

	/**
	 * Whether URL should be sent through the proxy server.
	 *
	 * We want to keep localhost and the blog URL from being sent through the proxy server, because
	 * some proxies can not handle this. We also have the constant available for defining other
	 * hosts that won't be sent through the proxy.
	 *
	 * @uses WP_PROXY_BYPASS_HOSTS
	 * @since 2.8.0
	 *
	 * @param string $uri URI to check.
	 * @return bool True, to send through the proxy and false if, the proxy should not be used.
	 */
	function send_through_proxy( $uri ) {
		// 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.
		if ( $check === false )
			return true;

		$home = parse_url( get_option('siteurl') );

		if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )
			return false;

		if ( !defined('WP_PROXY_BYPASS_HOSTS') )
			return true;

		static $bypass_hosts;
		static $wildcard_regex = false;
		if ( null == $bypass_hosts ) {
			$bypass_hosts = preg_split('|,\s*|', WP_PROXY_BYPASS_HOSTS);

			if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) {
				$wildcard_regex = array();
				foreach ( $bypass_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'], $bypass_hosts );
	}
}
/**
 * Internal representation of a single cookie.
 *
 * Returned cookies are represented using this class, and when cookies are set, if they are not
 * already a WP_Http_Cookie() object, then they are turned into one.
 *
 * @todo The WordPress convention is to use underscores instead of camelCase for function and method
 * names. Need to switch to use underscores instead for the methods.
 *
 * @package WordPress
 * @subpackage HTTP
 * @since 2.8.0
 */
class WP_Http_Cookie {

	/**
	 * Cookie name.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	var $name;

	/**
	 * Cookie value.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	var $value;

	/**
	 * When the cookie expires.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	var $expires;

	/**
	 * Cookie URL path.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	var $path;

	/**
	 * Cookie Domain.
	 *
	 * @since 2.8.0
	 * @var string
	 */
	var $domain;

	/**
	 * PHP4 style Constructor - Calls PHP5 Style Constructor.
	 *
	 * @access public
	 * @since 2.8.0
	 * @param string|array $data Raw cookie data.
	 */
	function WP_Http_Cookie( $data ) {
		$this->__construct( $data );
	}

	/**
	 * Sets up this cookie object.
	 *
	 * The parameter $data should be either an associative array containing the indices names below
	 * or a header string detailing it.
	 *
	 * If it's an array, it should include the following elements:
	 * <ol>
	 * <li>Name</li>
	 * <li>Value - should NOT be urlencoded already.</li>
	 * <li>Expires - (optional) String or int (UNIX timestamp).</li>
	 * <li>Path (optional)</li>
	 * <li>Domain (optional)</li>
	 * </ol>
	 *
	 * @access public
	 * @since 2.8.0
	 *
	 * @param string|array $data Raw cookie data.
	 */
	function __construct( $data ) {
		if ( is_string( $data ) ) {
			// Assume it's a header string direct from a previous request
			$pairs = explode( ';', $data );

			// Special handling for first pair; name=value. Also be careful of "=" in value
			$name  = trim( substr( $pairs[0], 0, strpos( $pairs[0], '=' ) ) );
			$value = substr( $pairs[0], strpos( $pairs[0], '=' ) + 1 );
			$this->name  = $name;
			$this->value = urldecode( $value );
			array_shift( $pairs ); //Removes name=value from items.

			// Set everything else as a property
			foreach ( $pairs as $pair ) {
				$pair = rtrim($pair);
				if ( empty($pair) ) //Handles the cookie ending in ; which results in a empty final pair
					continue;

				list( $key, $val ) = strpos( $pair, '=' ) ? explode( '=', $pair ) : array( $pair, '' );
				$key = strtolower( trim( $key ) );
				if ( 'expires' == $key )
					$val = strtotime( $val );
				$this->$key = $val;
			}
		} else {
			if ( !isset( $data['name'] ) )
				return false;

			// Set properties based directly on parameters
			$this->name   = $data['name'];
			$this->value  = isset( $data['value'] ) ? $data['value'] : '';
			$this->path   = isset( $data['path'] ) ? $data['path'] : '';
			$this->domain = isset( $data['domain'] ) ? $data['domain'] : '';

			if ( isset( $data['expires'] ) )
				$this->expires = is_int( $data['expires'] ) ? $data['expires'] : strtotime( $data['expires'] );
			else
				$this->expires = null;
		}
	}

	/**
	 * Confirms that it's OK to send this cookie to the URL checked against.
	 *
	 * Decision is based on RFC 2109/2965, so look there for details on validity.
	 *
	 * @access public
	 * @since 2.8.0
	 *
	 * @param string $url URL you intend to send this cookie to
	 * @return boolean TRUE if allowed, FALSE otherwise.
	 */
	function test( $url ) {
		// Expires - if expired then nothing else matters
		if ( time() > $this->expires )
			return false;

		// Get details on the URL we're thinking about sending to
		$url = parse_url( $url );
		$url['port'] = isset( $url['port'] ) ? $url['port'] : 80;
		$url['path'] = isset( $url['path'] ) ? $url['path'] : '/';

		// Values to use for comparison against the URL
		$path   = isset( $this->path )   ? $this->path   : '/';
		$port   = isset( $this->port )   ? $this->port   : 80;
		$domain = isset( $this->domain ) ? strtolower( $this->domain ) : strtolower( $url['host'] );
		if ( false === stripos( $domain, '.' ) )
			$domain .= '.local';

		// Host - very basic check that the request URL ends with the domain restriction (minus leading dot)
		$domain = substr( $domain, 0, 1 ) == '.' ? substr( $domain, 1 ) : $domain;
		if ( substr( $url['host'], -strlen( $domain ) ) != $domain )
			return false;

		// Port - supports "port-lists" in the format: "80,8000,8080"
		if ( !in_array( $url['port'], explode( ',', $port) ) )
			return false;

		// Path - request path must start with path restriction
		if ( substr( $url['path'], 0, strlen( $path ) ) != $path )
			return false;

		return true;
	}

	/**
	 * Convert cookie name and value back to header string.
	 *
	 * @access public
	 * @since 2.8.0
	 *
	 * @return string Header encoded cookie name and value.
	 */
	function getHeaderValue() {
		if ( empty( $this->name ) || empty( $this->value ) )
			return '';

		return $this->name . '=' . urlencode( $this->value );
	}

	/**
	 * Retrieve cookie header for usage in the rest of the WordPress HTTP API.
	 *
	 * @access public
	 * @since 2.8.0
	 *
	 * @return string
	 */
	function getFullHeader() {
		return 'Cookie: ' . $this->getHeaderValue();
	}
}

/**
 * Implementation for deflate and gzip transfer encodings.
 *
 * Includes RFC 1950, RFC 1951, and RFC 1952.
 *
 * @since 2.8
 * @package WordPress
 * @subpackage HTTP
 */
class WP_Http_Encoding {

	/**
	 * Compress raw string using the deflate format.
	 *
	 * Supports the RFC 1951 standard.
	 *
	 * @since 2.8
	 *
	 * @param string $raw String to compress.
	 * @param int $level Optional, default is 9. Compression level, 9 is highest.
	 * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
	 * @return string|bool False on failure.
	 */
	function compress( $raw, $level = 9, $supports = null ) {
		return gzdeflate( $raw, $level );
	}

	/**
	 * Decompression of deflated string.
	 *
	 * Will attempt to decompress using the RFC 1950 standard, and if that fails
	 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC
	 * 1952 standard gzip decode will be attempted. If all fail, then the
	 * original compressed string will be returned.
	 *
	 * @since 2.8
	 *
	 * @param string $compressed String to decompress.
	 * @param int $length The optional length of the compressed data.
	 * @return string|bool False on failure.
	 */
	function decompress( $compressed, $length = null ) {

		if ( empty($compressed) )
			return $compressed;

		if ( false !== ( $decompressed = @gzinflate( $compressed ) ) )
			return $decompressed;

		if ( false !== ( $decompressed = WP_Http_Encoding::compatible_gzinflate( $compressed ) ) )
			return $decompressed;

		if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) )
			return $decompressed;

		if ( function_exists('gzdecode') ) {
			$decompressed = @gzdecode( $compressed );

			if ( false !== $decompressed )
				return $decompressed;
		}

		return $compressed;
	}

	/**
	 * Decompression of deflated string while staying compatible with the majority of servers.
	 *
	 * Certain Servers will return deflated data with headers which PHP's gziniflate()
	 * function cannot handle out of the box. The following function lifted from
	 * http://au2.php.net/manual/en/function.gzinflate.php#77336 will attempt to deflate
	 * the various return forms used.
	 *
	 * @since 2.8.1
	 * @link http://au2.php.net/manual/en/function.gzinflate.php#77336
	 *
	 * @param string $gzData String to decompress.
	 * @return string|bool False on failure.
	 */
	function compatible_gzinflate($gzData) {
		if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {
			$i = 10;
			$flg = ord( substr($gzData, 3, 1) );
			if ( $flg > 0 ) {
				if ( $flg & 4 ) {
					list($xlen) = unpack('v', substr($gzData, $i, 2) );
					$i = $i + 2 + $xlen;
				}
				if ( $flg & 8 )
					$i = strpos($gzData, "\0", $i) + 1;
				if ( $flg & 16 )
					$i = strpos($gzData, "\0", $i) + 1;
				if ( $flg & 2 )
					$i = $i + 2;
			}
			return gzinflate( substr($gzData, $i, -8) );
		} else {
			return false;
		}
	}

	/**
	 * What encoding types to accept and their priority values.
	 *
	 * @since 2.8
	 *
	 * @return string Types of encoding to accept.
	 */
	function accept_encoding() {
		$type = array();
		if ( function_exists( 'gzinflate' ) )
			$type[] = 'deflate;q=1.0';

		if ( function_exists( 'gzuncompress' ) )
			$type[] = 'compress;q=0.5';

		if ( function_exists( 'gzdecode' ) )
			$type[] = 'gzip;q=0.5';

		return implode(', ', $type);
	}

	/**
	 * What enconding the content used when it was compressed to send in the headers.
	 *
	 * @since 2.8
	 *
	 * @return string Content-Encoding string to send in the header.
	 */
	function content_encoding() {
		return 'deflate';
	}

	/**
	 * Whether the content be decoded based on the headers.
	 *
	 * @since 2.8
	 *
	 * @param array|string $headers All of the available headers.
	 * @return bool
	 */
	function should_decode($headers) {
		if ( is_array( $headers ) ) {
			if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
				return true;
		} else if ( is_string( $headers ) ) {
			return ( stripos($headers, 'content-encoding:') !== false );
		}

		return false;
	}

	/**
	 * Whether decompression and compression are supported by the PHP version.
	 *
	 * Each function is tested instead of checking for the zlib extension, to
	 * ensure that the functions all exist in the PHP version and aren't
	 * disabled.
	 *
	 * @since 2.8
	 *
	 * @return bool
	 */
	function is_available() {
		return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') );
	}
}