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<?php
namespace Stripe\HttpClient;
use Stripe\Exception;
use Stripe\Stripe;
use Stripe\Util;
// @codingStandardsIgnoreStart
// PSR2 requires all constants be upper case. Sadly, the CURL_SSLVERSION
// constants do not abide by those rules.
// Note the values come from their position in the enums that
// defines them in cURL's source code.
// Available since PHP 5.5.19 and 5.6.3
if (!\defined('CURL_SSLVERSION_TLSv1_2')) {
\define('CURL_SSLVERSION_TLSv1_2', 6);
}
// @codingStandardsIgnoreEnd
// Available since PHP 7.0.7 and cURL 7.47.0
if (!\defined('CURL_HTTP_VERSION_2TLS')) {
\define('CURL_HTTP_VERSION_2TLS', 4);
}
class CurlClient implements ClientInterface, StreamingClientInterface
{
protected static $instance;
public static function instance()
{
if (!static::$instance) {
static::$instance = new static();
}
return static::$instance;
}
protected $defaultOptions;
/** @var \Stripe\Util\RandomGenerator */
protected $randomGenerator;
protected $userAgentInfo;
protected $enablePersistentConnections = true;
protected $enableHttp2;
protected $curlHandle;
protected $requestStatusCallback;
/**
* 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 null|array|callable $defaultOptions
* @param null|\Stripe\Util\RandomGenerator $randomGenerator
*/
public function __construct($defaultOptions = null, $randomGenerator = null)
{
$this->defaultOptions = $defaultOptions;
$this->randomGenerator = $randomGenerator ?: new Util\RandomGenerator();
$this->initUserAgentInfo();
$this->enableHttp2 = $this->canSafelyUseHttp2();
}
public function __destruct()
{
$this->closeCurlHandle();
}
public function initUserAgentInfo()
{
$curlVersion = \curl_version();
$this->userAgentInfo = [
'httplib' => 'curl ' . $curlVersion['version'],
'ssllib' => $curlVersion['ssl_version'],
];
}
public function getDefaultOptions()
{
return $this->defaultOptions;
}
public function getUserAgentInfo()
{
return $this->userAgentInfo;
}
/**
* @return bool
*/
public function getEnablePersistentConnections()
{
return $this->enablePersistentConnections;
}
/**
* @param bool $enable
*/
public function setEnablePersistentConnections($enable)
{
$this->enablePersistentConnections = $enable;
}
/**
* @return bool
*/
public function getEnableHttp2()
{
return $this->enableHttp2;
}
/**
* @param bool $enable
*/
public function setEnableHttp2($enable)
{
$this->enableHttp2 = $enable;
}
/**
* @return null|callable
*/
public function getRequestStatusCallback()
{
return $this->requestStatusCallback;
}
/**
* Sets a callback that is called after each request. The callback will
* receive the following parameters:
* <ol>
* <li>string $rbody The response body</li>
* <li>integer $rcode The response status code</li>
* <li>\Stripe\Util\CaseInsensitiveArray $rheaders The response headers</li>
* <li>integer $errno The curl error number</li>
* <li>string|null $message The curl error message</li>
* <li>boolean $shouldRetry Whether the request will be retried</li>
* <li>integer $numRetries The number of the retry attempt</li>
* </ol>.
*
* @param null|callable $requestStatusCallback
*/
public function setRequestStatusCallback($requestStatusCallback)
{
$this->requestStatusCallback = $requestStatusCallback;
}
// 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 $this->connectTimeout;
}
// END OF USER DEFINED TIMEOUTS
private function constructRequest($method, $absUrl, $headers, $params, $hasFile)
{
$method = \strtolower($method);
$opts = [];
if (\is_callable($this->defaultOptions)) { // call defaultOptions callback, set options to return value
$opts = \call_user_func_array($this->defaultOptions, \func_get_args());
if (!\is_array($opts)) {
throw new Exception\UnexpectedValueException('Non-array value returned by defaultOptions CurlClient callback');
}
} elseif (\is_array($this->defaultOptions)) { // set default curlopts from array
$opts = $this->defaultOptions;
}
$params = Util\Util::objectsToIds($params);
if ('get' === $method) {
if ($hasFile) {
throw new Exception\UnexpectedValueException(
'Issuing a GET request with a file parameter'
);
}
$opts[\CURLOPT_HTTPGET] = 1;
if (\count($params) > 0) {
$encoded = Util\Util::encodeParameters($params);
$absUrl = "{$absUrl}?{$encoded}";
}
} elseif ('post' === $method) {
$opts[\CURLOPT_POST] = 1;
$opts[\CURLOPT_POSTFIELDS] = $hasFile ? $params : Util\Util::encodeParameters($params);
} elseif ('delete' === $method) {
$opts[\CURLOPT_CUSTOMREQUEST] = 'DELETE';
if (\count($params) > 0) {
$encoded = Util\Util::encodeParameters($params);
$absUrl = "{$absUrl}?{$encoded}";
}
} else {
throw new Exception\UnexpectedValueException("Unrecognized method {$method}");
}
// It is only safe to retry network failures on POST requests if we
// add an Idempotency-Key header
if (('post' === $method) && (Stripe::$maxNetworkRetries > 0)) {
if (!$this->hasHeader($headers, 'Idempotency-Key')) {
$headers[] = 'Idempotency-Key: ' . $this->randomGenerator->uuid();
}
}
// 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.
$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_HTTPHEADER] = $headers;
$opts[\CURLOPT_CAINFO] = Stripe::getCABundlePath();
if (!Stripe::getVerifySslCerts()) {
$opts[\CURLOPT_SSL_VERIFYPEER] = false;
}
if (!isset($opts[\CURLOPT_HTTP_VERSION]) && $this->getEnableHttp2()) {
// For HTTPS requests, enable HTTP/2, if supported
$opts[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_2TLS;
}
// If the user didn't explicitly specify a CURLOPT_IPRESOLVE option, we
// force IPv4 resolving as Stripe's API servers are only accessible over
// IPv4 (see. https://github.com/stripe/stripe-php/issues/1045).
// We let users specify a custom option in case they need to say proxy
// through an IPv6 proxy.
if (!isset($opts[\CURLOPT_IPRESOLVE])) {
$opts[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V4;
}
return [$opts, $absUrl];
}
public function request($method, $absUrl, $headers, $params, $hasFile)
{
list($opts, $absUrl) = $this->constructRequest($method, $absUrl, $headers, $params, $hasFile);
list($rbody, $rcode, $rheaders) = $this->executeRequestWithRetries($opts, $absUrl);
return [$rbody, $rcode, $rheaders];
}
public function requestStream($method, $absUrl, $headers, $params, $hasFile, $readBodyChunk)
{
list($opts, $absUrl) = $this->constructRequest($method, $absUrl, $headers, $params, $hasFile);
$opts[\CURLOPT_RETURNTRANSFER] = false;
list($rbody, $rcode, $rheaders) = $this->executeStreamingRequestWithRetries($opts, $absUrl, $readBodyChunk);
return [$rbody, $rcode, $rheaders];
}
/**
* Curl permits sending \CURLOPT_HEADERFUNCTION, which is called with lines
* from the header and \CURLOPT_WRITEFUNCTION, which is called with bytes
* from the body. You usually want to handle the body differently depending
* on what was in the header.
*
* This function makes it easier to specify different callbacks depending
* on the contents of the heeder. After the header has been completely read
* and the body begins to stream, it will call $determineWriteCallback with
* the array of headers. $determineWriteCallback should, based on the
* headers it receives, return a "writeCallback" that describes what to do
* with the incoming HTTP response body.
*
* @param array $opts
* @param callable $determineWriteCallback
*
* @return array
*/
private function useHeadersToDetermineWriteCallback($opts, $determineWriteCallback)
{
$rheaders = new Util\CaseInsensitiveArray();
$headerCallback = function ($curl, $header_line) use (&$rheaders) {
return self::parseLineIntoHeaderArray($header_line, $rheaders);
};
$writeCallback = null;
$writeCallbackWrapper = function ($curl, $data) use (&$writeCallback, &$rheaders, &$determineWriteCallback) {
if (null === $writeCallback) {
$writeCallback = \call_user_func_array($determineWriteCallback, [$rheaders]);
}
return \call_user_func_array($writeCallback, [$curl, $data]);
};
return [$headerCallback, $writeCallbackWrapper];
}
private static function parseLineIntoHeaderArray($line, &$headers)
{
if (false === \strpos($line, ':')) {
return \strlen($line);
}
list($key, $value) = \explode(':', \trim($line), 2);
$headers[\trim($key)] = \trim($value);
return \strlen($line);
}
/**
* Like `executeRequestWithRetries` except:
* 1. Does not buffer the body of a successful (status code < 300)
* response into memory -- instead, calls the caller-provided
* $readBodyChunk with each chunk of incoming data.
* 2. Does not retry if a network error occurs while streaming the
* body of a successful response.
*
* @param array $opts cURL options
* @param string $absUrl
* @param callable $readBodyChunk
*
* @return array
*/
public function executeStreamingRequestWithRetries($opts, $absUrl, $readBodyChunk)
{
/** @var bool */
$shouldRetry = false;
/** @var int */
$numRetries = 0;
// Will contain the bytes of the body of the last request
// if it was not successful and should not be retries
/** @var null|string */
$rbody = null;
// Status code of the last request
/** @var null|bool */
$rcode = null;
// Array of headers from the last request
/** @var null|array */
$lastRHeaders = null;
$errno = null;
$message = null;
$determineWriteCallback = function ($rheaders) use (
&$readBodyChunk,
&$shouldRetry,
&$rbody,
&$numRetries,
&$rcode,
&$lastRHeaders,
&$errno
) {
$lastRHeaders = $rheaders;
$errno = \curl_errno($this->curlHandle);
$rcode = \curl_getinfo($this->curlHandle, \CURLINFO_HTTP_CODE);
// Send the bytes from the body of a successful request to the caller-provided $readBodyChunk.
if ($rcode < 300) {
$rbody = null;
return function ($curl, $data) use (&$readBodyChunk) {
// Don't expose the $curl handle to the user, and don't require them to
// return the length of $data.
\call_user_func_array($readBodyChunk, [$data]);
return \strlen($data);
};
}
$shouldRetry = $this->shouldRetry($errno, $rcode, $rheaders, $numRetries);
// Discard the body from an unsuccessful request that should be retried.
if ($shouldRetry) {
return function ($curl, $data) {
return \strlen($data);
};
} else {
// Otherwise, buffer the body into $rbody. It will need to be parsed to determine
// which exception to throw to the user.
$rbody = '';
return function ($curl, $data) use (&$rbody) {
$rbody .= $data;
return \strlen($data);
};
}
};
while (true) {
list($headerCallback, $writeCallback) = $this->useHeadersToDetermineWriteCallback($opts, $determineWriteCallback);
$opts[\CURLOPT_HEADERFUNCTION] = $headerCallback;
$opts[\CURLOPT_WRITEFUNCTION] = $writeCallback;
$shouldRetry = false;
$rbody = null;
$this->resetCurlHandle();
\curl_setopt_array($this->curlHandle, $opts);
$result = \curl_exec($this->curlHandle);
$errno = \curl_errno($this->curlHandle);
if (0 !== $errno) {
$message = \curl_error($this->curlHandle);
}
if (!$this->getEnablePersistentConnections()) {
$this->closeCurlHandle();
}
if (\is_callable($this->getRequestStatusCallback())) {
\call_user_func_array(
$this->getRequestStatusCallback(),
[$rbody, $rcode, $lastRHeaders, $errno, $message, $shouldRetry, $numRetries]
);
}
if ($shouldRetry) {
++$numRetries;
$sleepSeconds = $this->sleepTime($numRetries, $lastRHeaders);
\usleep((int) ($sleepSeconds * 1000000));
} else {
break;
}
}
if (0 !== $errno) {
$this->handleCurlError($absUrl, $errno, $message, $numRetries);
}
return [$rbody, $rcode, $lastRHeaders];
}
/**
* @param array $opts cURL options
* @param string $absUrl
*/
public function executeRequestWithRetries($opts, $absUrl)
{
$numRetries = 0;
while (true) {
$rcode = 0;
$errno = 0;
$message = null;
// Create a callback to capture HTTP headers for the response
$rheaders = new Util\CaseInsensitiveArray();
$headerCallback = function ($curl, $header_line) use (&$rheaders) {
return CurlClient::parseLineIntoHeaderArray($header_line, $rheaders);
};
$opts[\CURLOPT_HEADERFUNCTION] = $headerCallback;
$this->resetCurlHandle();
\curl_setopt_array($this->curlHandle, $opts);
$rbody = \curl_exec($this->curlHandle);
if (false === $rbody) {
$errno = \curl_errno($this->curlHandle);
$message = \curl_error($this->curlHandle);
} else {
$rcode = \curl_getinfo($this->curlHandle, \CURLINFO_HTTP_CODE);
}
if (!$this->getEnablePersistentConnections()) {
$this->closeCurlHandle();
}
$shouldRetry = $this->shouldRetry($errno, $rcode, $rheaders, $numRetries);
if (\is_callable($this->getRequestStatusCallback())) {
\call_user_func_array(
$this->getRequestStatusCallback(),
[$rbody, $rcode, $rheaders, $errno, $message, $shouldRetry, $numRetries]
);
}
if ($shouldRetry) {
++$numRetries;
$sleepSeconds = $this->sleepTime($numRetries, $rheaders);
\usleep((int) ($sleepSeconds * 1000000));
} else {
break;
}
}
if (false === $rbody) {
$this->handleCurlError($absUrl, $errno, $message, $numRetries);
}
return [$rbody, $rcode, $rheaders];
}
/**
* @param string $url
* @param int $errno
* @param string $message
* @param int $numRetries
*
* @throws Exception\ApiConnectionException
*/
private function handleCurlError($url, $errno, $message, $numRetries)
{
switch ($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 support@stripe.com.';
$msg .= "\n\n(Network error [errno {$errno}]: {$message})";
if ($numRetries > 0) {
$msg .= "\n\nRequest was retried {$numRetries} times.";
}
throw new Exception\ApiConnectionException($msg);
}
/**
* Checks if an error is a problem that we should retry on. This includes both
* socket errors that may represent an intermittent problem and some special
* HTTP statuses.
*
* @param int $errno
* @param int $rcode
* @param array|\Stripe\Util\CaseInsensitiveArray $rheaders
* @param int $numRetries
*
* @return bool
*/
private function shouldRetry($errno, $rcode, $rheaders, $numRetries)
{
if ($numRetries >= Stripe::getMaxNetworkRetries()) {
return false;
}
// Retry on timeout-related problems (either on open or read).
if (\CURLE_OPERATION_TIMEOUTED === $errno) {
return true;
}
// Destination refused the connection, the connection was reset, or a
// variety of other connection failures. This could occur from a single
// saturated server, so retry in case it's intermittent.
if (\CURLE_COULDNT_CONNECT === $errno) {
return true;
}
// The API may ask us not to retry (eg; if doing so would be a no-op)
// or advise us to retry (eg; in cases of lock timeouts); we defer to that.
if (isset($rheaders['stripe-should-retry'])) {
if ('false' === $rheaders['stripe-should-retry']) {
return false;
}
if ('true' === $rheaders['stripe-should-retry']) {
return true;
}
}
// 409 Conflict
if (409 === $rcode) {
return true;
}
// Retry on 500, 503, and other internal errors.
//
// Note that we expect the stripe-should-retry header to be false
// in most cases when a 500 is returned, since our idempotency framework
// would typically replay it anyway.
if ($rcode >= 500) {
return true;
}
return false;
}
/**
* Provides the number of seconds to wait before retrying a request.
*
* @param int $numRetries
* @param array|\Stripe\Util\CaseInsensitiveArray $rheaders
*
* @return int
*/
private function sleepTime($numRetries, $rheaders)
{
// Apply exponential backoff with $initialNetworkRetryDelay on the
// number of $numRetries so far as inputs. Do not allow the number to exceed
// $maxNetworkRetryDelay.
$sleepSeconds = \min(
Stripe::getInitialNetworkRetryDelay() * 1.0 * 2 ** ($numRetries - 1),
Stripe::getMaxNetworkRetryDelay()
);
// Apply some jitter by randomizing the value in the range of
// ($sleepSeconds / 2) to ($sleepSeconds).
$sleepSeconds *= 0.5 * (1 + $this->randomGenerator->randFloat());
// But never sleep less than the base sleep seconds.
$sleepSeconds = \max(Stripe::getInitialNetworkRetryDelay(), $sleepSeconds);
// And never sleep less than the time the API asks us to wait, assuming it's a reasonable ask.
$retryAfter = isset($rheaders['retry-after']) ? (float) ($rheaders['retry-after']) : 0.0;
if (\floor($retryAfter) === $retryAfter && $retryAfter <= Stripe::getMaxRetryAfter()) {
$sleepSeconds = \max($sleepSeconds, $retryAfter);
}
return $sleepSeconds;
}
/**
* Initializes the curl handle. If already initialized, the handle is closed first.
*/
private function initCurlHandle()
{
$this->closeCurlHandle();
$this->curlHandle = \curl_init();
}
/**
* Closes the curl handle if initialized. Do nothing if already closed.
*/
private function closeCurlHandle()
{
if (null !== $this->curlHandle) {
\curl_close($this->curlHandle);
$this->curlHandle = null;
}
}
/**
* Resets the curl handle. If the handle is not already initialized, or if persistent
* connections are disabled, the handle is reinitialized instead.
*/
private function resetCurlHandle()
{
if (null !== $this->curlHandle && $this->getEnablePersistentConnections()) {
\curl_reset($this->curlHandle);
} else {
$this->initCurlHandle();
}
}
/**
* Indicates whether it is safe to use HTTP/2 or not.
*
* @return bool
*/
private function canSafelyUseHttp2()
{
// Versions of curl older than 7.60.0 don't respect GOAWAY frames
// (cf. https://github.com/curl/curl/issues/2416), which Stripe use.
$curlVersion = \curl_version()['version'];
return \version_compare($curlVersion, '7.60.0') >= 0;
}
/**
* Checks if a list of headers contains a specific header name.
*
* @param string[] $headers
* @param string $name
*
* @return bool
*/
private function hasHeader($headers, $name)
{
foreach ($headers as $header) {
if (0 === \strncasecmp($header, "{$name}: ", \strlen($name) + 2)) {
return true;
}
}
return false;
}
}
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