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Capability.php
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Mon, May 13, 10:36

Capability.php
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<?php
/**
* Twilio Capability Token generator
*
* @category Services
* @package Services_Twilio
* @author Jeff Lindsay <jeff.lindsay@twilio.com>
* @license http://creativecommons.org/licenses/MIT/ MIT
*/
class Services_Twilio_Capability
{
public $accountSid;
public $authToken;
public $scopes;
/**
* Create a new TwilioCapability with zero permissions. Next steps are to
* grant access to resources by configuring this token through the
* functions allowXXXX.
*
* @param $accountSid the account sid to which this token is granted access
* @param $authToken the secret key used to sign the token. Note, this auth
* token is not visible to the user of the token.
*/
public function __construct($accountSid, $authToken)
{
$this->accountSid = $accountSid;
$this->authToken = $authToken;
$this->scopes = array();
$this->clientName = false;
}
/**
* If the user of this token should be allowed to accept incoming
* connections then configure the TwilioCapability through this method and
* specify the client name.
*
* @param $clientName
*/
public function allowClientIncoming($clientName)
{
// clientName must be a non-zero length alphanumeric string
if (preg_match('/\W/', $clientName)) {
throw new InvalidArgumentException(
'Only alphanumeric characters allowed in client name.');
}
if (strlen($clientName) == 0) {
throw new InvalidArgumentException(
'Client name must not be a zero length string.');
}
$this->clientName = $clientName;
$this->allow('client', 'incoming',
array('clientName' => $clientName));
}
/**
* Allow the user of this token to make outgoing connections.
*
* @param $appSid the application to which this token grants access
* @param $appParams signed parameters that the user of this token cannot
* overwrite.
*/
public function allowClientOutgoing($appSid, array $appParams=array())
{
$this->allow('client', 'outgoing', array(
'appSid' => $appSid,
'appParams' => http_build_query($appParams, '', '&')));
}
/**
* Allow the user of this token to access their event stream.
*
* @param $filters key/value filters to apply to the event stream
*/
public function allowEventStream(array $filters=array())
{
$this->allow('stream', 'subscribe', array(
'path' => '/2010-04-01/Events',
'params' => http_build_query($filters, '', '&'),
));
}
/**
* Generates a new token based on the credentials and permissions that
* previously has been granted to this token.
*
* @param $ttl the expiration time of the token (in seconds). Default
* value is 3600 (1hr)
* @return the newly generated token that is valid for $ttl seconds
*/
public function generateToken($ttl = 3600)
{
$payload = array(
'scope' => array(),
'iss' => $this->accountSid,
'exp' => time() + $ttl,
);
$scopeStrings = array();
foreach ($this->scopes as $scope) {
if ($scope->privilege == "outgoing" && $this->clientName)
$scope->params["clientName"] = $this->clientName;
$scopeStrings[] = $scope->toString();
}
$payload['scope'] = implode(' ', $scopeStrings);
return JWT::encode($payload, $this->authToken, 'HS256');
}
protected function allow($service, $privilege, $params) {
$this->scopes[] = new ScopeURI($service, $privilege, $params);
}
}
/**
* Scope URI implementation
*
* Simple way to represent configurable privileges in an OAuth
* friendly way. For our case, they look like this:
*
* scope:<service>:<privilege>?<params>
*
* For example:
* scope:client:incoming?name=jonas
*
* @author Jeff Lindsay <jeff.lindsay@twilio.com>
*/
class ScopeURI
{
public $service;
public $privilege;
public $params;
public function __construct($service, $privilege, $params = array())
{
$this->service = $service;
$this->privilege = $privilege;
$this->params = $params;
}
public function toString()
{
$uri = "scope:{$this->service}:{$this->privilege}";
if (count($this->params)) {
$uri .= "?".http_build_query($this->params, '', '&');
}
return $uri;
}
/**
* Parse a scope URI into a ScopeURI object
*
* @param string $uri The scope URI
* @return ScopeURI The parsed scope uri
*/
public static function parse($uri)
{
if (strpos($uri, 'scope:') !== 0) {
throw new UnexpectedValueException(
'Not a scope URI according to scheme');
}
$parts = explode('?', $uri, 1);
$params = null;
if (count($parts) > 1) {
parse_str($parts[1], $params);
}
$parts = explode(':', $parts[0], 2);
if (count($parts) != 3) {
throw new UnexpectedValueException(
'Not enough parts for scope URI');
}
list($scheme, $service, $privilege) = $parts;
return new ScopeURI($service, $privilege, $params);
}
}
/**
* JSON Web Token implementation
*
* Minimum implementation used by Realtime auth, based on this spec:
* http://self-issued.info/docs/draft-jones-json-web-token-01.html.
*
* @author Neuman Vong <neuman@twilio.com>
*/
class JWT
{
/**
* @param string $jwt The JWT
* @param string|null $key The secret key
* @param bool $verify Don't skip verification process
*
* @return object The JWT's payload as a PHP object
*/
public static function decode($jwt, $key = null, $verify = true)
{
$tks = explode('.', $jwt);
if (count($tks) != 3) {
throw new UnexpectedValueException('Wrong number of segments');
}
list($headb64, $payloadb64, $cryptob64) = $tks;
if (null === ($header = JWT::jsonDecode(JWT::urlsafeB64Decode($headb64)))
) {
throw new UnexpectedValueException('Invalid segment encoding');
}
if (null === $payload = JWT::jsonDecode(JWT::urlsafeB64Decode($payloadb64))
) {
throw new UnexpectedValueException('Invalid segment encoding');
}
$sig = JWT::urlsafeB64Decode($cryptob64);
if ($verify) {
if (empty($header->alg)) {
throw new DomainException('Empty algorithm');
}
if ($sig != JWT::sign("$headb64.$payloadb64", $key, $header->alg)) {
throw new UnexpectedValueException('Signature verification failed');
}
}
return $payload;
}
/**
* @param object|array $payload PHP object or array
* @param string $key The secret key
* @param string $algo The signing algorithm
*
* @return string A JWT
*/
public static function encode($payload, $key, $algo = 'HS256')
{
$header = array('typ' => 'JWT', 'alg' => $algo);
$segments = array();
$segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($header));
$segments[] = JWT::urlsafeB64Encode(JWT::jsonEncode($payload));
$signing_input = implode('.', $segments);
$signature = JWT::sign($signing_input, $key, $algo);
$segments[] = JWT::urlsafeB64Encode($signature);
return implode('.', $segments);
}
/**
* @param string $msg The message to sign
* @param string $key The secret key
* @param string $method The signing algorithm
*
* @return string An encrypted message
*/
public static function sign($msg, $key, $method = 'HS256')
{
$methods = array(
'HS256' => 'sha256',
'HS384' => 'sha384',
'HS512' => 'sha512',
);
if (empty($methods[$method])) {
throw new DomainException('Algorithm not supported');
}
return hash_hmac($methods[$method], $msg, $key, true);
}
/**
* @param string $input JSON string
*
* @return object Object representation of JSON string
*/
public static function jsonDecode($input)
{
$obj = json_decode($input);
if (function_exists('json_last_error') && $errno = json_last_error()) {
JWT::handleJsonError($errno);
}
else if ($obj === null && $input !== 'null') {
throw new DomainException('Null result with non-null input');
}
return $obj;
}
/**
* @param object|array $input A PHP object or array
*
* @return string JSON representation of the PHP object or array
*/
public static function jsonEncode($input)
{
$json = json_encode($input);
if (function_exists('json_last_error') && $errno = json_last_error()) {
JWT::handleJsonError($errno);
}
else if ($json === 'null' && $input !== null) {
throw new DomainException('Null result with non-null input');
}
return $json;
}
/**
* @param string $input A base64 encoded string
*
* @return string A decoded string
*/
public static function urlsafeB64Decode($input)
{
$padlen = 4 - strlen($input) % 4;
$input .= str_repeat('=', $padlen);
return base64_decode(strtr($input, '-_', '+/'));
}
/**
* @param string $input Anything really
*
* @return string The base64 encode of what you passed in
*/
public static function urlsafeB64Encode($input)
{
return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
}
/**
* @param int $errno An error number from json_last_error()
*
* @return void
*/
private static function handleJsonError($errno)
{
$messages = array(
JSON_ERROR_DEPTH => 'Maximum stack depth exceeded',
JSON_ERROR_CTRL_CHAR => 'Unexpected control character found',
JSON_ERROR_SYNTAX => 'Syntax error, malformed JSON'
);
throw new DomainException(isset($messages[$errno])
? $messages[$errno]
: 'Unknown JSON error: ' . $errno
);
}
}

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