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ConduitClient.php
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Thu, Nov 21, 16:31

ConduitClient.php
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<?php
final class ConduitClient extends Phobject {
private $uri;
private $host;
private $connectionID;
private $sessionKey;
private $timeout = 300.0;
private $username;
private $password;
private $publicKey;
private $privateKey;
private $conduitToken;
private $oauthToken;
const AUTH_ASYMMETRIC = 'asymmetric';
const SIGNATURE_CONSIGN_1 = 'Consign1.0/';
public function getConnectionID() {
return $this->connectionID;
}
public function __construct($uri) {
$this->uri = new PhutilURI($uri);
if (!strlen($this->uri->getDomain())) {
throw new Exception(
pht("Conduit URI '%s' must include a valid host.", $uri));
}
$this->host = $this->uri->getDomain();
}
/**
* Override the domain specified in the service URI and provide a specific
* host identity.
*
* This can be used to connect to a specific node in a cluster environment.
*/
public function setHost($host) {
$this->host = $host;
return $this;
}
public function getHost() {
return $this->host;
}
public function setConduitToken($conduit_token) {
$this->conduitToken = $conduit_token;
return $this;
}
public function getConduitToken() {
return $this->conduitToken;
}
public function setOAuthToken($oauth_token) {
$this->oauthToken = $oauth_token;
return $this;
}
public function callMethodSynchronous($method, array $params) {
return $this->callMethod($method, $params)->resolve();
}
public function didReceiveResponse($method, $data) {
if ($method == 'conduit.connect') {
$this->sessionKey = idx($data, 'sessionKey');
$this->connectionID = idx($data, 'connectionID');
}
return $data;
}
public function setTimeout($timeout) {
$this->timeout = $timeout;
return $this;
}
public function setSigningKeys(
$public_key,
PhutilOpaqueEnvelope $private_key) {
$this->publicKey = $public_key;
$this->privateKey = $private_key;
return $this;
}
public function callMethod($method, array $params) {
$meta = array();
if ($this->sessionKey) {
$meta['sessionKey'] = $this->sessionKey;
}
if ($this->connectionID) {
$meta['connectionID'] = $this->connectionID;
}
if ($method == 'conduit.connect') {
$certificate = idx($params, 'certificate');
if ($certificate) {
$token = time();
$params['authToken'] = $token;
$params['authSignature'] = sha1($token.$certificate);
}
unset($params['certificate']);
}
if ($this->privateKey && $this->publicKey) {
$meta['auth.type'] = self::AUTH_ASYMMETRIC;
$meta['auth.key'] = $this->publicKey;
$meta['auth.host'] = $this->getHostStringForSignature();
$signature = $this->signRequest($method, $params, $meta);
$meta['auth.signature'] = $signature;
}
if ($this->conduitToken) {
$meta['token'] = $this->conduitToken;
}
if ($this->oauthToken) {
$meta['access_token'] = $this->oauthToken;
}
if ($meta) {
$params['__conduit__'] = $meta;
}
$uri = id(clone $this->uri)->setPath('/api/'.$method);
$data = array(
'params' => json_encode($params),
'output' => 'json',
// This is a hint to Phabricator that the client expects a Conduit
// response. It is not necessary, but provides better error messages in
// some cases.
'__conduit__' => true,
);
// Always use the cURL-based HTTPSFuture, for proxy support and other
// protocol edge cases that HTTPFuture does not support.
$core_future = new HTTPSFuture($uri, $data);
$core_future->addHeader('Host', $this->getHostStringForHeader());
$core_future->setMethod('POST');
$core_future->setTimeout($this->timeout);
if ($this->username !== null) {
$core_future->setHTTPBasicAuthCredentials(
$this->username,
$this->password);
}
return id(new ConduitFuture($core_future))
->setClient($this, $method);
}
public function setBasicAuthCredentials($username, $password) {
$this->username = $username;
$this->password = new PhutilOpaqueEnvelope($password);
return $this;
}
private function getHostStringForHeader() {
return $this->newHostString(false);
}
private function getHostStringForSignature() {
return $this->newHostString(true);
}
/**
* Build a string describing the host for this request.
*
* This method builds strings in two modes: with explicit ports for request
* signing (which always include the port number) and with implicit ports
* for use in the "Host:" header of requests (which omit the port number if
* the port is the same as the default port for the protocol).
*
* This implicit port behavior is similar to what browsers do, so it is less
* likely to get us into trouble with webserver configurations.
*
* @param bool True to include the port explicitly.
* @return string String describing the host for the request.
*/
private function newHostString($with_explicit_port) {
$host = $this->getHost();
$uri = new PhutilURI($this->uri);
$protocol = $uri->getProtocol();
$port = $uri->getPort();
$implicit_ports = array(
'https' => 443,
);
$default_port = 80;
$implicit_port = idx($implicit_ports, $protocol, $default_port);
if ($with_explicit_port) {
if (!$port) {
$port = $implicit_port;
}
} else {
if ($port == $implicit_port) {
$port = null;
}
}
if (!$port) {
$result = $host;
} else {
$result = $host.':'.$port;
}
return $result;
}
private function signRequest(
$method,
array $params,
array $meta) {
$input = self::encodeRequestDataForSignature(
$method,
$params,
$meta);
$signature = null;
$result = openssl_sign(
$input,
$signature,
$this->privateKey->openEnvelope());
if (!$result) {
throw new Exception(
pht('Unable to sign Conduit request with signing key.'));
}
return self::SIGNATURE_CONSIGN_1.base64_encode($signature);
}
public static function verifySignature(
$method,
array $params,
array $meta,
$openssl_public_key) {
$auth_type = idx($meta, 'auth.type');
switch ($auth_type) {
case self::AUTH_ASYMMETRIC:
break;
default:
throw new Exception(
pht(
'Unable to verify request signature, specified "%s" '.
'("%s") is unknown.',
'auth.type',
$auth_type));
}
$public_key = idx($meta, 'auth.key');
if (!strlen($public_key)) {
throw new Exception(
pht(
'Unable to verify request signature, no "%s" present in '.
'request protocol information.',
'auth.key'));
}
$signature = idx($meta, 'auth.signature');
if (!strlen($signature)) {
throw new Exception(
pht(
'Unable to verify request signature, no "%s" present '.
'in request protocol information.',
'auth.signature'));
}
$prefix = self::SIGNATURE_CONSIGN_1;
if (strncmp($signature, $prefix, strlen($prefix)) !== 0) {
throw new Exception(
pht(
'Unable to verify request signature, signature format is not '.
'known.'));
}
$signature = substr($signature, strlen($prefix));
$input = self::encodeRequestDataForSignature(
$method,
$params,
$meta);
$signature = base64_decode($signature);
$trap = new PhutilErrorTrap();
$result = @openssl_verify(
$input,
$signature,
$openssl_public_key);
$err = $trap->getErrorsAsString();
$trap->destroy();
if ($result === 1) {
// Signature is good.
return true;
} else if ($result === 0) {
// Signature is bad.
throw new Exception(
pht(
'Request signature verification failed: signature is not correct.'));
} else {
// Some kind of error.
if (strlen($err)) {
throw new Exception(
pht(
'OpenSSL encountered an error verifying the request signature: %s',
$err));
} else {
throw new Exception(
pht(
'OpenSSL encountered an unknown error verifying the request: %s',
$err));
}
}
}
private static function encodeRequestDataForSignature(
$method,
array $params,
array $meta) {
unset($meta['auth.signature']);
$structure = array(
'method' => $method,
'protocol' => $meta,
'parameters' => $params,
);
return self::encodeRawDataForSignature($structure);
}
public static function encodeRawDataForSignature($data) {
$out = array();
if (is_array($data)) {
if (phutil_is_natural_list($data)) {
$out[] = 'A';
$out[] = count($data);
$out[] = ':';
foreach ($data as $value) {
$out[] = self::encodeRawDataForSignature($value);
}
} else {
ksort($data);
$out[] = 'O';
$out[] = count($data);
$out[] = ':';
foreach ($data as $key => $value) {
$out[] = self::encodeRawDataForSignature($key);
$out[] = self::encodeRawDataForSignature($value);
}
}
} else if (is_string($data)) {
$out[] = 'S';
$out[] = strlen($data);
$out[] = ':';
$out[] = $data;
} else if (is_int($data)) {
$out[] = 'I';
$out[] = strlen((string)$data);
$out[] = ':';
$out[] = (string)$data;
} else if (is_null($data)) {
$out[] = 'N';
$out[] = ':';
} else if ($data === true) {
$out[] = 'B1:';
} else if ($data === false) {
$out[] = 'B0:';
} else {
throw new Exception(
pht(
'Unexpected data type in request data: %s.',
gettype($data)));
}
return implode('', $out);
}
}

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