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ApiRequestor.php
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Wed, Nov 20, 12:44

ApiRequestor.php
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<?php
class Stripe_ApiRequestor
{
/**
* @var string $apiKey The API key that's to be used to make requests.
*/
public $apiKey;
private static $_preFlight;
private static function blacklistedCerts()
{
return array(
'05c0b3643694470a888c6e7feb5c9e24e823dc53',
'5b7dc7fbc98d78bf76d4d4fa6f597a0c901fad5c',
);
}
public function __construct($apiKey=null)
{
$this->_apiKey = $apiKey;
}
/**
* @param string $url The path to the API endpoint.
*
* @returns string The full path.
*/
public static function apiUrl($url='')
{
$apiBase = Stripe::$apiBase;
return "$apiBase$url";
}
/**
* @param string|mixed $value A string to UTF8-encode.
*
* @returns string|mixed The UTF8-encoded string, or the object passed in if
* it wasn't a string.
*/
public static function utf8($value)
{
if (is_string($value)
&& mb_detect_encoding($value, "UTF-8", TRUE) != "UTF-8") {
return utf8_encode($value);
} else {
return $value;
}
}
private static function _encodeObjects($d)
{
if ($d instanceof Stripe_ApiResource) {
return self::utf8($d->id);
} else if ($d === true) {
return 'true';
} else if ($d === false) {
return 'false';
} else if (is_array($d)) {
$res = array();
foreach ($d as $k => $v)
$res[$k] = self::_encodeObjects($v);
return $res;
} else {
return self::utf8($d);
}
}
/**
* @param array $arr An map of param keys to values.
* @param string|null $prefix (It doesn't look like we ever use $prefix...)
*
* @returns string A querystring, essentially.
*/
public static function encode($arr, $prefix=null)
{
if (!is_array($arr))
return $arr;
$r = array();
foreach ($arr as $k => $v) {
if (is_null($v))
continue;
if ($prefix && $k && !is_int($k))
$k = $prefix."[".$k."]";
else if ($prefix)
$k = $prefix."[]";
if (is_array($v)) {
$r[] = self::encode($v, $k, true);
} else {
$r[] = urlencode($k)."=".urlencode($v);
}
}
return implode("&", $r);
}
/**
* @param string $method
* @param string $url
* @param array|null $params
*
* @return array An array whose first element is the response and second
* element is the API key used to make the request.
*/
public function request($method, $url, $params=null)
{
if (!$params)
$params = array();
list($rbody, $rcode, $myApiKey) =
$this->_requestRaw($method, $url, $params);
$resp = $this->_interpretResponse($rbody, $rcode);
return array($resp, $myApiKey);
}
/**
* @param string $rbody A JSON string.
* @param int $rcode
* @param array $resp
*
* @throws Stripe_InvalidRequestError if the error is caused by the user.
* @throws Stripe_AuthenticationError if the error is caused by a lack of
* permissions.
* @throws Stripe_CardError if the error is the error code is 402 (payment
* required)
* @throws Stripe_ApiError otherwise.
*/
public function handleApiError($rbody, $rcode, $resp)
{
if (!is_array($resp) || !isset($resp['error'])) {
$msg = "Invalid response object from API: $rbody "
."(HTTP response code was $rcode)";
throw new Stripe_ApiError($msg, $rcode, $rbody, $resp);
}
$error = $resp['error'];
$msg = isset($error['message']) ? $error['message'] : null;
$param = isset($error['param']) ? $error['param'] : null;
$code = isset($error['code']) ? $error['code'] : null;
switch ($rcode) {
case 400:
if ($code == 'rate_limit') {
throw new Stripe_RateLimitError(
$msg, $param, $rcode, $rbody, $resp
);
}
case 404:
throw new Stripe_InvalidRequestError(
$msg, $param, $rcode, $rbody, $resp
);
case 401:
throw new Stripe_AuthenticationError($msg, $rcode, $rbody, $resp);
case 402:
throw new Stripe_CardError($msg, $param, $code, $rcode, $rbody, $resp);
default:
throw new Stripe_ApiError($msg, $rcode, $rbody, $resp);
}
}
private function _requestRaw($method, $url, $params)
{
$myApiKey = $this->_apiKey;
if (!$myApiKey)
$myApiKey = Stripe::$apiKey;
if (!$myApiKey) {
$msg = 'No API key provided. (HINT: set your API key using '
. '"Stripe::setApiKey(<API-KEY>)". You can generate API keys from '
. 'the Stripe web interface. See https://stripe.com/api for '
. 'details, or email support@stripe.com if you have any questions.';
throw new Stripe_AuthenticationError($msg);
}
$absUrl = $this->apiUrl($url);
$params = self::_encodeObjects($params);
$langVersion = phpversion();
$uname = php_uname();
$ua = array('bindings_version' => Stripe::VERSION,
'lang' => 'php',
'lang_version' => $langVersion,
'publisher' => 'stripe',
'uname' => $uname);
$headers = array('X-Stripe-Client-User-Agent: ' . json_encode($ua),
'User-Agent: Stripe/v1 PhpBindings/' . Stripe::VERSION,
'Authorization: Bearer ' . $myApiKey);
if (Stripe::$apiVersion)
$headers[] = 'Stripe-Version: ' . Stripe::$apiVersion;
list($rbody, $rcode) = $this->_curlRequest(
$method,
$absUrl,
$headers,
$params
);
return array($rbody, $rcode, $myApiKey);
}
private function _interpretResponse($rbody, $rcode)
{
try {
$resp = json_decode($rbody, true);
} catch (Exception $e) {
$msg = "Invalid response body from API: $rbody "
. "(HTTP response code was $rcode)";
throw new Stripe_ApiError($msg, $rcode, $rbody);
}
if ($rcode < 200 || $rcode >= 300) {
$this->handleApiError($rbody, $rcode, $resp);
}
return $resp;
}
private function _curlRequest($method, $absUrl, $headers, $params)
{
if (!self::$_preFlight) {
self::$_preFlight = $this->checkSslCert($this->apiUrl());
}
$curl = curl_init();
$method = strtolower($method);
$opts = array();
if ($method == 'get') {
$opts[CURLOPT_HTTPGET] = 1;
if (count($params) > 0) {
$encoded = self::encode($params);
$absUrl = "$absUrl?$encoded";
}
} else if ($method == 'post') {
$opts[CURLOPT_POST] = 1;
$opts[CURLOPT_POSTFIELDS] = self::encode($params);
} else if ($method == 'delete') {
$opts[CURLOPT_CUSTOMREQUEST] = 'DELETE';
if (count($params) > 0) {
$encoded = self::encode($params);
$absUrl = "$absUrl?$encoded";
}
} else {
throw new Stripe_ApiError("Unrecognized method $method");
}
$absUrl = self::utf8($absUrl);
$opts[CURLOPT_URL] = $absUrl;
$opts[CURLOPT_RETURNTRANSFER] = true;
$opts[CURLOPT_CONNECTTIMEOUT] = 30;
$opts[CURLOPT_TIMEOUT] = 80;
$opts[CURLOPT_RETURNTRANSFER] = true;
$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 = $this->caBundle();
curl_setopt($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);
$this->handleCurlError($errno, $message);
}
$rcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
curl_close($curl);
return array($rbody, $rcode);
}
/**
* @param number $errno
* @param string $message
* @throws Stripe_ApiConnectionError
*/
public function handleCurlError($errno, $message)
{
$apiBase = Stripe::$apiBase;
switch ($errno) {
case CURLE_COULDNT_CONNECT:
case CURLE_COULDNT_RESOLVE_HOST:
case CURLE_OPERATION_TIMEOUTED:
$msg = "Could not connect to Stripe ($apiBase). 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 $apiBase 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]: $message)";
throw new Stripe_ApiConnectionError($msg);
}
/**
* Preflight the SSL certificate presented by the backend. This isn't 100%
* bulletproof, in that we're not actually validating the transport used to
* communicate with Stripe, merely that the first attempt to does not use a
* revoked certificate.
*
* Unfortunately the interface to OpenSSL doesn't make it easy to check the
* certificate before sending potentially sensitive data on the wire. This
* approach raises the bar for an attacker significantly.
*/
private function checkSslCert($url)
{
if (version_compare(PHP_VERSION, '5.3.0', '<')) {
error_log(
'Warning: This version of PHP is too old to check SSL certificates '.
'correctly. Stripe cannot guarantee that the server has a '.
'certificate which is not blacklisted'
);
return true;
}
if (strpos(PHP_VERSION, 'hiphop') !== false) {
error_log(
'Warning: HHVM does not support Stripe\'s SSL certificate '.
'verification. (See http://docs.hhvm.com/manual/en/context.ssl.php) '.
'Stripe cannot guarantee that the server has a certificate which is '.
'not blacklisted'
);
return true;
}
$url = parse_url($url);
$port = isset($url["port"]) ? $url["port"] : 443;
$url = "ssl://{$url["host"]}:{$port}";
$sslContext = stream_context_create(
array('ssl' => array(
'capture_peer_cert' => true,
'verify_peer' => true,
'cafile' => $this->caBundle(),
))
);
$result = stream_socket_client(
$url, $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $sslContext
);
if ($errno !== 0) {
$apiBase = Stripe::$apiBase;
throw new Stripe_ApiConnectionError(
'Could not connect to Stripe (' . $apiBase . '). Please check your '.
'internet connection and try again. If this problem persists, '.
'you should check Stripe\'s service status at '.
'https://twitter.com/stripestatus. Reason was: '.$errstr
);
}
$params = stream_context_get_params($result);
$cert = $params['options']['ssl']['peer_certificate'];
openssl_x509_export($cert, $pemCert);
if (self::isBlackListed($pemCert)) {
throw new Stripe_ApiConnectionError(
'Invalid server certificate. You tried to connect to a server that '.
'has a revoked SSL certificate, which means we cannot securely send '.
'data to that server. Please email support@stripe.com if you need '.
'help connecting to the correct API server.'
);
}
return true;
}
/* Checks if a valid PEM encoded certificate is blacklisted
* @return boolean
*/
public static function isBlackListed($certificate)
{
$certificate = trim($certificate);
$lines = explode("\n", $certificate);
// Kludgily remove the PEM padding
array_shift($lines); array_pop($lines);
$derCert = base64_decode(implode("", $lines));
$fingerprint = sha1($derCert);
return in_array($fingerprint, self::blacklistedCerts());
}
private function caBundle()
{
return dirname(__FILE__) . '/../data/ca-certificates.crt';
}
}

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