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<?php
namespace Stripe\HttpClient;
use Stripe\Stripe;
use Stripe\Error;
use Stripe\Util;
// cURL constants are not defined in PHP < 5.5
// @codingStandardsIgnoreStart
// PSR2 requires all constants be upper case. Sadly, the CURL_SSLVERSION
// constants do not abide by those rules.
// Note the values 1 and 6 come from their position in the enum that
// defines them in cURL's source code.
if (!defined('CURL_SSLVERSION_TLSv1')) {
define('CURL_SSLVERSION_TLSv1', 1);
}
if (!defined('CURL_SSLVERSION_TLSv1_2')) {
define('CURL_SSLVERSION_TLSv1_2', 6);
}
// @codingStandardsIgnoreEnd
class CurlClient implements ClientInterface
{
private static $instance;
public static function instance()
{
if (!self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
protected $defaultOptions;
protected $userAgentInfo;
/**
* CurlClient constructor.
*
* Pass in a callable to $defaultOptions that returns an array of CURLOPT_* values to start
* off a request with, or an flat array with the same format used by curl_setopt_array() to
* provide a static set of options. Note that many options are overridden later in the request
* call, including timeouts, which can be set via setTimeout() and setConnectTimeout().
*
* Note that request() will silently ignore a non-callable, non-array $defaultOptions, and will
* throw an exception if $defaultOptions returns a non-array value.
*
* @param array|callable|null $defaultOptions
*/
public function __construct($defaultOptions = null)
{
$this->defaultOptions = $defaultOptions;
$this->initUserAgentInfo();
}
public function initUserAgentInfo()
{
$curlVersion = curl_version();
$this->userAgentInfo = array(
'httplib' => 'curl ' . $curlVersion['version'],
'ssllib' => $curlVersion['ssl_version'],
);
}
public function getDefaultOptions()
{
return $this->defaultOptions;
}
public function getUserAgentInfo()
{
return $this->userAgentInfo;
}
// USER DEFINED TIMEOUTS
const DEFAULT_TIMEOUT = 80;
const DEFAULT_CONNECT_TIMEOUT = 30;
private $timeout = self::DEFAULT_TIMEOUT;
private $connectTimeout = self::DEFAULT_CONNECT_TIMEOUT;
public function setTimeout($seconds)
{
$this->timeout = (int) max($seconds, 0);
return $this;
}
public function setConnectTimeout($seconds)
{
$this->connectTimeout = (int) max($seconds, 0);
return $this;
}
public function getTimeout()
{
return $this->timeout;
}
public function getConnectTimeout()
{
return $this->connectTimeout;
}
// END OF USER DEFINED TIMEOUTS
public function request($method, $absUrl, $headers, $params, $hasFile)
{
$curl = curl_init();
$method = strtolower($method);
$opts = array();
if (is_callable($this->defaultOptions)) { // call defaultOptions callback, set options to return value
$opts = call_user_func_array($this->defaultOptions, func_get_args());
if (!is_array($opts)) {
throw new Error\Api("Non-array value returned by defaultOptions CurlClient callback");
}
} elseif (is_array($this->defaultOptions)) { // set default curlopts from array
$opts = $this->defaultOptions;
}
if ($method == 'get') {
if ($hasFile) {
throw new Error\Api(
"Issuing a GET request with a file parameter"
);
}
$opts[CURLOPT_HTTPGET] = 1;
if (count($params) > 0) {
$encoded = Util\Util::urlEncode($params);
$absUrl = "$absUrl?$encoded";
}
} elseif ($method == 'post') {
$opts[CURLOPT_POST] = 1;
$opts[CURLOPT_POSTFIELDS] = $hasFile ? $params : Util\Util::urlEncode($params);
} elseif ($method == 'delete') {
$opts[CURLOPT_CUSTOMREQUEST] = 'DELETE';
if (count($params) > 0) {
$encoded = Util\Util::urlEncode($params);
$absUrl = "$absUrl?$encoded";
}
} else {
throw new Error\Api("Unrecognized method $method");
}
// Create a callback to capture HTTP headers for the response
$rheaders = array();
$headerCallback = function ($curl, $header_line) use (&$rheaders) {
// Ignore the HTTP request line (HTTP/1.1 200 OK)
if (strpos($header_line, ":") === false) {
return strlen($header_line);
}
list($key, $value) = explode(":", trim($header_line), 2);
$rheaders[trim($key)] = trim($value);
return strlen($header_line);
};
// By default for large request body sizes (> 1024 bytes), cURL will
// send a request without a body and with a `Expect: 100-continue`
// header, which gives the server a chance to respond with an error
// status code in cases where one can be determined right away (say
// on an authentication problem for example), and saves the "large"
// request body from being ever sent.
//
// Unfortunately, the bindings don't currently correctly handle the
// success case (in which the server sends back a 100 CONTINUE), so
// we'll error under that condition. To compensate for that problem
// for the time being, override cURL's behavior by simply always
// sending an empty `Expect:` header.
array_push($headers, 'Expect: ');
$absUrl = Util\Util::utf8($absUrl);
$opts[CURLOPT_URL] = $absUrl;
$opts[CURLOPT_RETURNTRANSFER] = true;
$opts[CURLOPT_CONNECTTIMEOUT] = $this->connectTimeout;
$opts[CURLOPT_TIMEOUT] = $this->timeout;
$opts[CURLOPT_HEADERFUNCTION] = $headerCallback;
$opts[CURLOPT_HTTPHEADER] = $headers;
if (!Stripe::$verifySslCerts) {
$opts[CURLOPT_SSL_VERIFYPEER] = false;
}
curl_setopt_array($curl, $opts);
$rbody = curl_exec($curl);
if (!defined('CURLE_SSL_CACERT_BADFILE')) {
define('CURLE_SSL_CACERT_BADFILE', 77); // constant not defined in PHP
}
$errno = curl_errno($curl);
if ($errno == CURLE_SSL_CACERT ||
$errno == CURLE_SSL_PEER_CERTIFICATE ||
$errno == CURLE_SSL_CACERT_BADFILE
) {
array_push(
$headers,
'X-Stripe-Client-Info: {"ca":"using Stripe-supplied CA bundle"}'
);
$cert = self::caBundle();
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
curl_setopt($curl, CURLOPT_CAINFO, $cert);
$rbody = curl_exec($curl);
}
if ($rbody === false) {
$errno = curl_errno($curl);
$message = curl_error($curl);
curl_close($curl);
$this->handleCurlError($absUrl, $errno, $message);
}
$rcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
curl_close($curl);
return array($rbody, $rcode, $rheaders);
}
/**
* @param number $errno
* @param string $message
* @throws Error\ApiConnection
*/
private function handleCurlError($url, $errno, $message)
{
switch ($errno) {
case CURLE_COULDNT_CONNECT:
case CURLE_COULDNT_RESOLVE_HOST:
case CURLE_OPERATION_TIMEOUTED:
$msg = "Could not connect to Stripe ($url). Please check your "
. "internet connection and try again. If this problem persists, "
. "you should check Stripe's service status at "
. "https://twitter.com/stripestatus, or";
break;
case CURLE_SSL_CACERT:
case CURLE_SSL_PEER_CERTIFICATE:
$msg = "Could not verify Stripe's SSL certificate. Please make sure "
. "that your network is not intercepting certificates. "
. "(Try going to $url in your browser.) "
. "If this problem persists,";
break;
default:
$msg = "Unexpected error communicating with Stripe. "
. "If this problem persists,";
}
$msg .= " let us know at [email protected].";
$msg .= "\n\n(Network error [errno $errno]: $message)";
throw new Error\ApiConnection($msg);
}
private static function caBundle()
{
return dirname(__FILE__) . '/../../data/ca-certificates.crt';
}
}