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<?php
namespace League\OAuth1\Client\Signature;
use GuzzleHttp\Psr7;
use GuzzleHttp\Psr7\Uri;
class HmacSha1Signature extends Signature implements SignatureInterface
{
/**
* {@inheritDoc}
*/
public function method()
{
return 'HMAC-SHA1';
}
/**
* {@inheritDoc}
*/
public function sign($uri, array $parameters = array(), $method = 'POST')
{
$url = $this->createUrl($uri);
$baseString = $this->baseString($url, $method, $parameters);
return base64_encode($this->hash($baseString));
}
/**
* Create a Guzzle url for the given URI.
*
* @param string $uri
*
* @return Url
*/
protected function createUrl($uri)
{
return Psr7\uri_for($uri);
}
/**
* Generate a base string for a HMAC-SHA1 signature
* based on the given a url, method, and any parameters.
*
* @param Url $url
* @param string $method
* @param array $parameters
*
* @return string
*/
protected function baseString(Uri $url, $method = 'POST', array $parameters = array())
{
$baseString = rawurlencode($method).'&';
$schemeHostPath = Uri::fromParts(array(
'scheme' => $url->getScheme(),
'host' => $url->getHost(),
'path' => $url->getPath(),
));
$baseString .= rawurlencode($schemeHostPath).'&';
$data = array();
parse_str($url->getQuery(), $query);
$data = array_merge($query, $parameters);
// normalize data key/values
array_walk_recursive($data, function (&$key, &$value) {
$key = rawurlencode(rawurldecode($key));
$value = rawurlencode(rawurldecode($value));
});
ksort($data);
$baseString .= $this->queryStringFromData($data);
return $baseString;
}
/**
* Creates an array of rawurlencoded strings out of each array key/value pair
* Handles multi-demensional arrays recursively.
*
* @param array $data Array of parameters to convert.
* @param array $queryParams Array to extend. False by default.
* @param string $prevKey Optional Array key to append
*
* @return string rawurlencoded string version of data
*/
protected function queryStringFromData($data, $queryParams = false, $prevKey = '')
{
if ($initial = (false === $queryParams)) {
$queryParams = array();
}
foreach ($data as $key => $value) {
if ($prevKey) {
$key = $prevKey.'['.$key.']'; // Handle multi-dimensional array
}
if (is_array($value)) {
$queryParams = $this->queryStringFromData($value, $queryParams, $key);
} else {
$queryParams[] = rawurlencode($key.'='.$value); // join with equals sign
}
}
if ($initial) {
return implode('%26', $queryParams); // join with ampersand
}
return $queryParams;
}
/**
* Hashes a string with the signature's key.
*
* @param string $string
*
* @return string
*/
protected function hash($string)
{
return hash_hmac('sha1', $string, $this->key(), true);
}
}
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