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<?php
/**
* @copyright 2021 Podlibre
* @license https://www.gnu.org/licenses/agpl-3.0.en.html AGPL3
* @link https://castopod.org/
*/
namespace ActivityPub;
use CodeIgniter\I18n\Time;
use phpseclib\Crypt\RSA;
class ActivityRequest
{
/**
* @var \CodeIgniter\HTTP\CURLRequest
*/
protected $request;
/**
* @var \CodeIgniter\HTTP\URI
*/
protected $uri;
/**
* @var \ActivityPub\Core\Activity|null
*/
protected $activity;
/**
* @var array
*/
protected $options = [
'headers' => [
'Content-Type' => 'application/activity+json',
'Accept' => 'application/activity+json', // TODO: outgoing and incoming requests
],
];
/**
* @param string $uri
* @param string $activityPayload
*/
public function __construct($uri, $activityPayload = null)
{
$this->request = \Config\Services::curlrequest();
if ($activityPayload) {
$this->request->setBody($activityPayload);
}
$this->uri = new \CodeIgniter\HTTP\URI($uri);
}
public function post()
{
// send Message to Fediverse instance
$this->request->post($this->uri, $this->options);
}
public function get()
{
return $this->request->get($this->uri, $this->options);
}
public function getDomain()
{
return $this->uri->getHost() .
($this->uri->getPort() ? ':' . $this->uri->getPort() : '');
}
public function sign($keyId, $privateKey)
{
$rsa = new RSA();
$rsa->loadKey($privateKey); // private key
$rsa->setHash('sha256');
$rsa->setSignatureMode(RSA::SIGNATURE_PKCS1);
$path =
$this->uri->getPath() .
($this->uri->getQuery() ? "?{$this->uri->getQuery()}" : '');
$host = $this->uri->getHost();
$date = Time::now('GMT')->format('D, d M Y H:i:s T');
$digest = 'SHA-256=' . base64_encode($this->getBodyDigest());
$contentType = $this->options['headers']['Content-Type'];
$contentLength = strval(strlen($this->request->getBody()));
$userAgent = 'Castopod';
$plainText = "(request-target): post $path\nhost: $host\ndate: $date\ndigest: $digest\ncontent-type: $contentType\ncontent-length: $contentLength\nuser-agent: $userAgent";
$signature = $rsa->sign($plainText);
$signatureHeader =
'keyId="' .
$keyId .
'",algorithm="rsa-sha256",headers="(request-target) host date digest content-type content-length user-agent",signature="' .
base64_encode($signature) .
'"';
$this->options = [
'headers' => [
'Content-Type' => $contentType,
'Content-Length' => $contentLength,
'Authorization' => "Signature $signatureHeader",
'Signature' => $signatureHeader,
'Host' => $host,
'Date' => $date,
'User-Agent' => $userAgent,
'Digest' => $digest,
],
];
}
protected function getBodyDigest()
{
return hash('sha256', $this->request->getBody(), true);
}
}