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PhutilOAuth1Future.php
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Thu, Aug 22, 10:16

PhutilOAuth1Future.php
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<?php
/**
* Proxy future that implements OAuth1 request signing. For references, see:
*
* RFC 5849: http://tools.ietf.org/html/rfc5849
* Guzzle: https://github.com/guzzle/guzzle/blob/master/src/Guzzle/Plugin/Oauth/OauthPlugin.php
*
*/
final class PhutilOAuth1Future extends FutureProxy {
private $uri;
private $data;
private $consumerKey;
private $consumerSecret;
private $signatureMethod;
private $privateKey;
private $method = 'POST';
private $token;
private $tokenSecret;
private $nonce;
private $timestamp;
private $hasConstructedFuture;
private $callbackURI;
private $headers = array();
public function setCallbackURI($callback_uri) {
$this->callbackURI = $callback_uri;
return $this;
}
public function setTimestamp($timestamp) {
$this->timestamp = $timestamp;
return $this;
}
public function setNonce($nonce) {
$this->nonce = $nonce;
return $this;
}
public function setTokenSecret($token_secret) {
$this->tokenSecret = $token_secret;
return $this;
}
public function setToken($token) {
$this->token = $token;
return $this;
}
public function setPrivateKey(PhutilOpaqueEnvelope $private_key) {
$this->privateKey = $private_key;
return $this;
}
public function setSignatureMethod($signature_method) {
$this->signatureMethod = $signature_method;
return $this;
}
public function setConsumerKey($consumer_key) {
$this->consumerKey = $consumer_key;
return $this;
}
public function setConsumerSecret(PhutilOpaqueEnvelope $consumer_secret) {
$this->consumerSecret = $consumer_secret;
return $this;
}
public function setMethod($method) {
$this->method = $method;
return $this;
}
public function __construct($uri, $data = array()) {
$this->uri = new PhutilURI((string)$uri);
$this->data = $data;
$this->setProxiedFuture(new HTTPSFuture($uri, $data));
}
public function getSignature() {
$params = array();
// NOTE: The JIRA API uses JSON-encoded request bodies which are not
// signed, and OAuth1 provides no real way to sign a nonparameterized
// request body. Possibly we should split this apart into flags which
// control which data is signed, but for now this rule seems to cover
// all the use cases.
if (is_array($this->data)) {
$params = $this->data;
}
$params = $params
+ $this->uri->getQueryParams()
+ $this->getOAuth1Headers();
return $this->sign($params);
}
public function addHeader($name, $value) {
// If we haven't built the future yet, hold on to the header until after
// we do, since there might be more changes coming which will affect the
// signature process.
if (!$this->hasConstructedFuture) {
$this->headers[] = array($name, $value);
} else {
$this->getProxiedFuture()->addHeader($name, $value);
}
return $this;
}
protected function getProxiedFuture() {
$future = parent::getProxiedFuture();
if (!$this->hasConstructedFuture) {
$future->setMethod($this->method);
$oauth_headers = $this->getOAuth1Headers();
$oauth_headers['oauth_signature'] = $this->getSignature();
$full_oauth_header = array();
foreach ($oauth_headers as $header => $value) {
$full_oauth_header[] = $header.'="'.urlencode($value).'"';
}
$full_oauth_header = 'OAuth '.implode(', ', $full_oauth_header);
$future->addHeader('Authorization', $full_oauth_header);
foreach ($this->headers as $header) {
$future->addHeader($header[0], $header[1]);
}
$this->headers = array();
$this->hasConstructedFuture = true;
}
return $future;
}
protected function didReceiveResult($result) {
return $result;
}
private function getOAuth1Headers() {
if (!$this->nonce) {
$this->nonce = Filesystem::readRandomCharacters(32);
}
if (!$this->timestamp) {
$this->timestamp = time();
}
$oauth_headers = array(
'oauth_consumer_key' => $this->consumerKey,
'oauth_signature_method' => $this->signatureMethod,
'oauth_timestamp' => $this->timestamp,
'oauth_nonce' => $this->nonce,
'oauth_version' => '1.0',
);
if ($this->callbackURI) {
$oauth_headers['oauth_callback'] = (string)$this->callbackURI;
}
if ($this->token) {
$oauth_headers['oauth_token'] = $this->token;
}
return $oauth_headers;
}
private function sign(array $params) {
ksort($params);
$pstr = array();
foreach ($params as $key => $value) {
$pstr[] = rawurlencode($key).'='.rawurlencode($value);
}
$pstr = implode('&', $pstr);
$sign_uri = clone $this->uri;
$sign_uri->setFragment('');
$sign_uri->setQueryParams(array());
$sign_uri->setProtocol(phutil_utf8_strtolower($sign_uri->getProtocol()));
$protocol = $sign_uri->getProtocol();
switch ($protocol) {
case 'http':
if ($sign_uri->getPort() == 80) {
$sign_uri->setPort(null);
}
break;
case 'https':
if ($sign_uri->getPort() == 443) {
$sign_uri->setPort(null);
}
break;
}
$method = rawurlencode(phutil_utf8_strtoupper($this->method));
$sign_uri = rawurlencode((string)$sign_uri);
$pstr = rawurlencode($pstr);
$sign_input = "{$method}&{$sign_uri}&{$pstr}";
return $this->signString($sign_input);
}
private function signString($string) {
$consumer_secret = null;
if ($this->consumerSecret) {
$consumer_secret = $this->consumerSecret->openEnvelope();
}
$key = urlencode($consumer_secret).'&'.urlencode($this->tokenSecret);
switch ($this->signatureMethod) {
case 'HMAC-SHA1':
if (!$this->consumerSecret) {
throw new Exception(
pht(
"Signature method '%s' requires %s!",
'HMAC-SHA1',
'setConsumerSecret()'));
}
$hash = hash_hmac('sha1', $string, $key, true);
return base64_encode($hash);
case 'RSA-SHA1':
if (!$this->privateKey) {
throw new Exception(
pht(
"Signature method '%s' requires %s!",
'RSA-SHA1',
'setPrivateKey()'));
}
$cert = @openssl_pkey_get_private($this->privateKey->openEnvelope());
if (!$cert) {
throw new Exception(pht('%s failed!', 'openssl_pkey_get_private()'));
}
$pkey = @openssl_get_privatekey($cert);
if (!$pkey) {
throw new Exception(pht('%s failed!', 'openssl_get_privatekey()'));
}
$signature = null;
$ok = openssl_sign($string, $signature, $pkey, OPENSSL_ALGO_SHA1);
if (!$ok) {
throw new Exception(pht('%s failed!', 'openssl_sign()'));
}
openssl_free_key($pkey);
return base64_encode($signature);
case 'PLAINTEXT':
if (!$this->consumerSecret) {
throw new Exception(
pht(
"Signature method '%s' requires %s!",
'PLAINTEXT',
'setConsumerSecret()'));
}
return $key;
default:
throw new Exception(pht("Unknown signature method '%s'!", $string));
}
}
public function resolvex() {
$result = $this->getProxiedFuture()->resolvex();
return $this->didReceiveResult($result);
}
public function resolveJSON() {
$result = $this->getProxiedFuture()->resolvex();
$result = $this->didReceiveResult($result);
list($body) = $result;
try {
return phutil_json_decode($body);
} catch (PhutilJSONParserException $ex) {
throw new PhutilProxyException(pht('Expected JSON.'), $ex);
}
}
}

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