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<?php
namespace Dweipert\CardmarketApi;
use Psr\Http\Message\RequestInterface;
class OAuthMiddleware
{
public function __invoke(callable $handler): callable
{
return function (RequestInterface $request, array $options) use ($handler) {
$cardMarketConfig = $options['cardmarket'];
$oAuthParams = [
'oauth_consumer_key' => $cardMarketConfig['app_token'],
'oauth_token' => $cardMarketConfig['access_token'],
'oauth_nonce' => uniqid(),
'oauth_timestamp' => time(),
'oauth_signature_method' => 'HMAC-SHA1',
'oauth_version' => '1.0',
];
$oAuthHeaderParams = $oAuthParams + [
'realm' => $request->getUri(),
'oauth_signature' => $this->getOAuthSignature($request->getMethod(), $request->getUri(), $options, $oAuthParams)
];
$oAuthHeader = 'OAuth ' .
implode(',', array_map(
fn ($key, $value) => "$key=\"$value\"",
array_keys($oAuthHeaderParams),
$oAuthHeaderParams
));
$request = $request->withHeader('Authorization', $oAuthHeader);
return $handler($request, $options);
};
}
/**
* Generates the OAuthSignature
* @see https://api.cardmarket.com/ws/documentation/API:Auth_libcurl
*
* @param string $method
* @param string $uri
* @param array $options
* @param array $oAuthParams
*
* @return string
*/
private function getOAuthSignature(string $method, string $uri, array $options, array $oAuthParams): string
{
$cardMarketConfig = $options['cardmarket'];
ksort($oAuthParams);
$baseStringParams = [
strtoupper($method),
rawurlencode($uri),
rawurlencode(http_build_query($oAuthParams)),
];
$baseString = implode('&', $baseStringParams);
$signatureKey = rawurlencode($cardMarketConfig['app_secret']) . '&' . rawurlencode($cardMarketConfig['access_token_secret']);
$rawSignature = hash_hmac('sha1', $baseString, $signatureKey, true);
return base64_encode($rawSignature);
}
}
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