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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
use MediaWiki\Logger\LoggerFactory;
use Psr\Log\LoggerInterface;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\NullLogger;
/**
* This wrapper class will call out to curl (if available) or fallback
* to regular PHP if necessary for handling internal HTTP requests.
*
* Renamed from HttpRequest to MWHttpRequest to avoid conflict with
* PHP's HTTP extension.
*/
class MWHttpRequest implements LoggerAwareInterface {
const SUPPORTS_FILE_POSTS = false;
protected $content;
protected $timeout = 'default';
protected $headersOnly = null;
protected $postData = null;
protected $proxy = null;
protected $noProxy = false;
protected $sslVerifyHost = true;
protected $sslVerifyCert = true;
protected $caInfo = null;
protected $method = "GET";
protected $reqHeaders = [];
protected $url;
protected $parsedUrl;
protected $callback;
protected $maxRedirects = 5;
protected $followRedirects = false;
/**
* @var CookieJar
*/
protected $cookieJar;
protected $headerList = [];
protected $respVersion = "0.9";
protected $respStatus = "200 Ok";
protected $respHeaders = [];
public $status;
/**
* @var Profiler
*/
protected $profiler;
/**
* @var string
*/
protected $profileName;
/**
* @var LoggerInterface;
*/
protected $logger;
/**
* @param string $url Url to use. If protocol-relative, will be expanded to an http:// URL
* @param array $options (optional) extra params to pass (see Http::request())
* @param string $caller The method making this request, for profiling
* @param Profiler $profiler An instance of the profiler for profiling, or null
*/
protected function __construct(
$url, $options = [], $caller = __METHOD__, $profiler = null
) {
global $wgHTTPTimeout, $wgHTTPConnectTimeout;
$this->url = wfExpandUrl( $url, PROTO_HTTP );
$this->parsedUrl = wfParseUrl( $this->url );
if ( isset( $options['logger'] ) ) {
$this->logger = $options['logger'];
} else {
$this->logger = new NullLogger();
}
if ( !$this->parsedUrl || !Http::isValidURI( $this->url ) ) {
$this->status = Status::newFatal( 'http-invalid-url', $url );
} else {
$this->status = Status::newGood( 100 ); // continue
}
if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
$this->timeout = $options['timeout'];
} else {
$this->timeout = $wgHTTPTimeout;
}
if ( isset( $options['connectTimeout'] ) && $options['connectTimeout'] != 'default' ) {
$this->connectTimeout = $options['connectTimeout'];
} else {
$this->connectTimeout = $wgHTTPConnectTimeout;
}
if ( isset( $options['userAgent'] ) ) {
$this->setUserAgent( $options['userAgent'] );
}
$members = [ "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
"method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" ];
foreach ( $members as $o ) {
if ( isset( $options[$o] ) ) {
// ensure that MWHttpRequest::method is always
// uppercased. Bug 36137
if ( $o == 'method' ) {
$options[$o] = strtoupper( $options[$o] );
}
$this->$o = $options[$o];
}
}
if ( $this->noProxy ) {
$this->proxy = ''; // noProxy takes precedence
}
// Profile based on what's calling us
$this->profiler = $profiler;
$this->profileName = $caller;
}
/**
* @param LoggerInterface $logger
*/
public function setLogger( LoggerInterface $logger ) {
$this->logger = $logger;
}
/**
* Simple function to test if we can make any sort of requests at all, using
* cURL or fopen()
* @return bool
*/
public static function canMakeRequests() {
return function_exists( 'curl_init' ) || wfIniGetBool( 'allow_url_fopen' );
}
/**
* Generate a new request object
* @param string $url Url to use
* @param array $options (optional) extra params to pass (see Http::request())
* @param string $caller The method making this request, for profiling
* @throws MWException
* @return CurlHttpRequest|PhpHttpRequest
* @see MWHttpRequest::__construct
*/
public static function factory( $url, $options = null, $caller = __METHOD__ ) {
if ( !Http::$httpEngine ) {
Http::$httpEngine = function_exists( 'curl_init' ) ? 'curl' : 'php';
} elseif ( Http::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
throw new MWException( __METHOD__ . ': curl (http://php.net/curl) is not installed, but' .
' Http::$httpEngine is set to "curl"' );
}
if ( !is_array( $options ) ) {
$options = [];
}
if ( !isset( $options['logger'] ) ) {
$options['logger'] = LoggerFactory::getInstance( 'http' );
}
switch ( Http::$httpEngine ) {
case 'curl':
return new CurlHttpRequest( $url, $options, $caller, Profiler::instance() );
case 'php':
if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
throw new MWException( __METHOD__ . ': allow_url_fopen ' .
'needs to be enabled for pure PHP http requests to ' .
'work. If possible, curl should be used instead. See ' .
'http://php.net/curl.'
);
}
return new PhpHttpRequest( $url, $options, $caller, Profiler::instance() );
default:
throw new MWException( __METHOD__ . ': The setting of Http::$httpEngine is not valid.' );
}
}
/**
* Get the body, or content, of the response to the request
*
* @return string
*/
public function getContent() {
return $this->content;
}
/**
* Set the parameters of the request
*
* @param array $args
* @todo overload the args param
*/
public function setData( $args ) {
$this->postData = $args;
}
/**
* Take care of setting up the proxy (do nothing if "noProxy" is set)
*
* @return void
*/
public function proxySetup() {
// If there is an explicit proxy set and proxies are not disabled, then use it
if ( $this->proxy && !$this->noProxy ) {
return;
}
// Otherwise, fallback to $wgHTTPProxy if this is not a machine
// local URL and proxies are not disabled
if ( self::isLocalURL( $this->url ) || $this->noProxy ) {
$this->proxy = '';
} else {
$this->proxy = Http::getProxy();
}
}
/**
* Check if the URL can be served by localhost
*
* @param string $url Full url to check
* @return bool
*/
private static function isLocalURL( $url ) {
global $wgCommandLineMode, $wgLocalVirtualHosts;
if ( $wgCommandLineMode ) {
return false;
}
// Extract host part
$matches = [];
if ( preg_match( '!^https?://([\w.-]+)[/:].*$!', $url, $matches ) ) {
$host = $matches[1];
// Split up dotwise
$domainParts = explode( '.', $host );
// Check if this domain or any superdomain is listed as a local virtual host
$domainParts = array_reverse( $domainParts );
$domain = '';
$countParts = count( $domainParts );
for ( $i = 0; $i < $countParts; $i++ ) {
$domainPart = $domainParts[$i];
if ( $i == 0 ) {
$domain = $domainPart;
} else {
$domain = $domainPart . '.' . $domain;
}
if ( in_array( $domain, $wgLocalVirtualHosts ) ) {
return true;
}
}
}
return false;
}
/**
* Set the user agent
* @param string $UA
*/
public function setUserAgent( $UA ) {
$this->setHeader( 'User-Agent', $UA );
}
/**
* Set an arbitrary header
* @param string $name
* @param string $value
*/
public function setHeader( $name, $value ) {
// I feel like I should normalize the case here...
$this->reqHeaders[$name] = $value;
}
/**
* Get an array of the headers
* @return array
*/
public function getHeaderList() {
$list = [];
if ( $this->cookieJar ) {
$this->reqHeaders['Cookie'] =
$this->cookieJar->serializeToHttpRequest(
$this->parsedUrl['path'],
$this->parsedUrl['host']
);
}
foreach ( $this->reqHeaders as $name => $value ) {
$list[] = "$name: $value";
}
return $list;
}
/**
* Set a read callback to accept data read from the HTTP request.
* By default, data is appended to an internal buffer which can be
* retrieved through $req->getContent().
*
* To handle data as it comes in -- especially for large files that
* would not fit in memory -- you can instead set your own callback,
* in the form function($resource, $buffer) where the first parameter
* is the low-level resource being read (implementation specific),
* and the second parameter is the data buffer.
*
* You MUST return the number of bytes handled in the buffer; if fewer
* bytes are reported handled than were passed to you, the HTTP fetch
* will be aborted.
*
* @param callable $callback
* @throws MWException
*/
public function setCallback( $callback ) {
if ( !is_callable( $callback ) ) {
throw new MWException( 'Invalid MwHttpRequest callback' );
}
$this->callback = $callback;
}
/**
* A generic callback to read the body of the response from a remote
* server.
*
* @param resource $fh
* @param string $content
* @return int
*/
public function read( $fh, $content ) {
$this->content .= $content;
return strlen( $content );
}
/**
* Take care of whatever is necessary to perform the URI request.
*
* @return Status
*/
public function execute() {
$this->content = "";
if ( strtoupper( $this->method ) == "HEAD" ) {
$this->headersOnly = true;
}
$this->proxySetup(); // set up any proxy as needed
if ( !$this->callback ) {
$this->setCallback( [ $this, 'read' ] );
}
if ( !isset( $this->reqHeaders['User-Agent'] ) ) {
$this->setUserAgent( Http::userAgent() );
}
}
/**
* Parses the headers, including the HTTP status code and any
* Set-Cookie headers. This function expects the headers to be
* found in an array in the member variable headerList.
*/
protected function parseHeader() {
$lastname = "";
foreach ( $this->headerList as $header ) {
if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
$this->respVersion = $match[1];
$this->respStatus = $match[2];
} elseif ( preg_match( "#^[ \t]#", $header ) ) {
$last = count( $this->respHeaders[$lastname] ) - 1;
$this->respHeaders[$lastname][$last] .= "\r\n$header";
} elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
$this->respHeaders[strtolower( $match[1] )][] = $match[2];
$lastname = strtolower( $match[1] );
}
}
$this->parseCookies();
}
/**
* Sets HTTPRequest status member to a fatal value with the error
* message if the returned integer value of the status code was
* not successful (< 300) or a redirect (>=300 and < 400). (see
* RFC2616, section 10,
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
* list of status codes.)
*/
protected function setStatus() {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
if ( (int)$this->respStatus > 399 ) {
list( $code, $message ) = explode( " ", $this->respStatus, 2 );
$this->status->fatal( "http-bad-status", $code, $message );
}
}
/**
* Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
* (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
* for a list of status codes.)
*
* @return int
*/
public function getStatus() {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
return (int)$this->respStatus;
}
/**
* Returns true if the last status code was a redirect.
*
* @return bool
*/
public function isRedirect() {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
$status = (int)$this->respStatus;
if ( $status >= 300 && $status <= 303 ) {
return true;
}
return false;
}
/**
* Returns an associative array of response headers after the
* request has been executed. Because some headers
* (e.g. Set-Cookie) can appear more than once the, each value of
* the associative array is an array of the values given.
*
* @return array
*/
public function getResponseHeaders() {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
return $this->respHeaders;
}
/**
* Returns the value of the given response header.
*
* @param string $header
* @return string|null
*/
public function getResponseHeader( $header ) {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
if ( isset( $this->respHeaders[strtolower( $header )] ) ) {
$v = $this->respHeaders[strtolower( $header )];
return $v[count( $v ) - 1];
}
return null;
}
/**
* Tells the MWHttpRequest object to use this pre-loaded CookieJar.
*
* @param CookieJar $jar
*/
public function setCookieJar( $jar ) {
$this->cookieJar = $jar;
}
/**
* Returns the cookie jar in use.
*
* @return CookieJar
*/
public function getCookieJar() {
if ( !$this->respHeaders ) {
$this->parseHeader();
}
return $this->cookieJar;
}
/**
* Sets a cookie. Used before a request to set up any individual
* cookies. Used internally after a request to parse the
* Set-Cookie headers.
* @see Cookie::set
* @param string $name
* @param mixed $value
* @param array $attr
*/
public function setCookie( $name, $value = null, $attr = null ) {
if ( !$this->cookieJar ) {
$this->cookieJar = new CookieJar;
}
$this->cookieJar->setCookie( $name, $value, $attr );
}
/**
* Parse the cookies in the response headers and store them in the cookie jar.
*/
protected function parseCookies() {
if ( !$this->cookieJar ) {
$this->cookieJar = new CookieJar;
}
if ( isset( $this->respHeaders['set-cookie'] ) ) {
$url = parse_url( $this->getFinalUrl() );
foreach ( $this->respHeaders['set-cookie'] as $cookie ) {
$this->cookieJar->parseCookieResponseHeader( $cookie, $url['host'] );
}
}
}
/**
* Returns the final URL after all redirections.
*
* Relative values of the "Location" header are incorrect as
* stated in RFC, however they do happen and modern browsers
* support them. This function loops backwards through all
* locations in order to build the proper absolute URI - Marooned
* at wikia-inc.com
*
* Note that the multiple Location: headers are an artifact of
* CURL -- they shouldn't actually get returned this way. Rewrite
* this when bug 29232 is taken care of (high-level redirect
* handling rewrite).
*
* @return string
*/
public function getFinalUrl() {
$headers = $this->getResponseHeaders();
// return full url (fix for incorrect but handled relative location)
if ( isset( $headers['location'] ) ) {
$locations = $headers['location'];
$domain = '';
$foundRelativeURI = false;
$countLocations = count( $locations );
for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
$url = parse_url( $locations[$i] );
if ( isset( $url['host'] ) ) {
$domain = $url['scheme'] . '://' . $url['host'];
break; // found correct URI (with host)
} else {
$foundRelativeURI = true;
}
}
if ( $foundRelativeURI ) {
if ( $domain ) {
return $domain . $locations[$countLocations - 1];
} else {
$url = parse_url( $this->url );
if ( isset( $url['host'] ) ) {
return $url['scheme'] . '://' . $url['host'] .
$locations[$countLocations - 1];
}
}
} else {
return $locations[$countLocations - 1];
}
}
return $this->url;
}
/**
* Returns true if the backend can follow redirects. Overridden by the
* child classes.
* @return bool
*/
public function canFollowRedirects() {
return true;
}
}