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<?php
namespace OAuth\OAuth1\Signature;
use OAuth\Common\Consumer\CredentialsInterface;
use OAuth\Common\Http\Uri\UriInterface;
use OAuth\OAuth1\Signature\Exception\UnsupportedHashAlgorithmException;
class Signature implements SignatureInterface
{
/**
* @var Credentials
*/
protected $credentials;
/**
* @var string
*/
protected $algorithm;
/**
* @var string
*/
protected $tokenSecret = null;
/**
* @param CredentialsInterface $credentials
*/
public function __construct(CredentialsInterface $credentials)
{
$this->credentials = $credentials;
}
/**
* @param string $algorithm
*/
public function setHashingAlgorithm($algorithm)
{
$this->algorithm = $algorithm;
}
/**
* @param string $token
*/
public function setTokenSecret($token)
{
$this->tokenSecret = $token;
}
/**
* @param UriInterface $uri
* @param array $params
* @param string $method
*
* @return string
*/
public function getSignature(UriInterface $uri, array $params, $method = 'POST')
{
parse_str($uri->getQuery(), $queryStringData);
foreach (array_merge($queryStringData, $params) as $key => $value) {
$signatureData[rawurlencode($key)] = rawurlencode($value);
}
ksort($signatureData);
// determine base uri
$baseUri = $uri->getScheme() . '://' . $uri->getRawAuthority();
if ('/' === $uri->getPath()) {
$baseUri .= $uri->hasExplicitTrailingHostSlash() ? '/' : '';
} else {
$baseUri .= $uri->getPath();
}
$baseString = strtoupper($method) . '&';
$baseString .= rawurlencode($baseUri) . '&';
$baseString .= rawurlencode($this->buildSignatureDataString($signatureData));
return base64_encode($this->hash($baseString));
}
/**
* @param array $signatureData
*
* @return string
*/
protected function buildSignatureDataString(array $signatureData)
{
$signatureString = '';
$delimiter = '';
foreach ($signatureData as $key => $value) {
$signatureString .= $delimiter . $key . '=' . $value;
$delimiter = '&';
}
return $signatureString;
}
/**
* @return string
*/
protected function getSigningKey()
{
$signingKey = rawurlencode($this->credentials->getConsumerSecret()) . '&';
if ($this->tokenSecret !== null) {
$signingKey .= rawurlencode($this->tokenSecret);
}
return $signingKey;
}
/**
* @param string $data
*
* @return string
*
* @throws UnsupportedHashAlgorithmException
*/
protected function hash($data)
{
switch (strtoupper($this->algorithm)) {
case 'HMAC-SHA1':
return hash_hmac('sha1', $data, $this->getSigningKey(), true);
default:
throw new UnsupportedHashAlgorithmException(
'Unsupported hashing algorithm (' . $this->algorithm . ') used.'
);
}
}
}
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