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<?php
namespace Zotlabs\Zot6;
use Zotlabs\Lib\Config;
use Zotlabs\Lib\Crypto;
use Zotlabs\Lib\Libzot;
use Zotlabs\Web\HTTPSig;
class Receiver {
protected $data;
protected $encrypted;
protected $error;
protected $messagetype;
protected $sender;
protected $site_id;
protected $validated;
protected $recipients;
protected $response;
protected $handler;
protected $prvkey;
protected $rawdata;
protected $sigdata;
function __construct($handler, $localdata = null) {
$this->error = false;
$this->validated = false;
$this->messagetype = '';
$this->response = [ 'success' => false ];
$this->handler = $handler;
$this->data = null;
$this->rawdata = null;
$this->site_id = null;
$this->prvkey = Config::get('system','prvkey');
$this->hub = null;
if($localdata) {
$this->rawdata = $localdata;
}
else {
$this->rawdata = file_get_contents('php://input');
// All access to the zot endpoint must use http signatures
if (! $this->Valid_Httpsig()) {
logger('signature failed');
$this->error = true;
$this->response['message'] = 'signature invalid';
return;
}
}
logger('received raw: ' . print_r($this->rawdata,true), LOGGER_DATA);
if ($this->rawdata) {
$this->data = json_decode($this->rawdata,true);
}
else {
$this->error = true;
$this->response['message'] = 'no data';
}
logger('received_json: ' . json_encode($this->data,JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES), LOGGER_DATA);
logger('received: ' . print_r($this->data,true), LOGGER_DATA);
if ($this->data && is_array($this->data)) {
$this->encrypted = ((array_key_exists('encrypted',$this->data) && intval($this->data['encrypted'])) ? true : false);
if ($this->encrypted && $this->prvkey) {
$uncrypted = Crypto::unencapsulate($this->data,$this->prvkey);
// openssl_decrypt() will sometimes return garbage instead of false when
// a wrong key is used. This can happen in case of hub re-installs.
// Hence also check with str_starts_with().
if ($uncrypted && str_starts_with($uncrypted, '{')) {
$this->data = json_decode($uncrypted,true);
}
else {
$this->error = true;
$this->response['message'] = 'no data (decryption failed)';
}
}
}
}
function run() {
if ($this->error) {
// make timing attacks on the decryption engine a bit more difficult
usleep(mt_rand(10000,100000));
return($this->response);
}
if ($this->data) {
if (array_key_exists('type',$this->data)) {
$this->messagetype = $this->data['type'];
}
if (! $this->messagetype) {
$this->error = true;
$this->response['message'] = 'no datatype';
return $this->response;
}
$this->sender = ((array_key_exists('sender',$this->data)) ? $this->data['sender'] : null);
$this->recipients = ((array_key_exists('recipients',$this->data)) ? $this->data['recipients'] : null);
$this->site_id = ((array_key_exists('site_id',$this->data)) ? $this->data['site_id'] : null);
}
if ($this->sender) {
$result = $this->ValidateSender();
if (! $result) {
$this->error = true;
return $this->response;
}
}
return $this->Dispatch();
}
function ValidateSender() {
$hub = Libzot::valid_hub($this->sender,$this->site_id);
if (! $hub) {
$x = Libzot::register_hub($this->sigdata['signer']);
if($x['success']) {
$hub = Libzot::valid_hub($this->sender,$this->site_id);
}
if(! $hub) {
$this->response['message'] = 'sender unknown';
return false;
}
}
if (! check_siteallowed($hub['hubloc_url'])) {
$this->response['message'] = 'forbidden';
return false;
}
if (! check_channelallowed($this->sender)) {
$this->response['message'] = 'forbidden';
return false;
}
Libzot::update_hub_connected($hub,$this->site_id);
$this->validated = true;
$this->hub = $hub;
return true;
}
function Valid_Httpsig() {
$result = false;
$this->sigdata = HTTPSig::verify($this->rawdata, EMPTY_STR, 'zot6');
if ($this->sigdata && $this->sigdata['header_signed'] && $this->sigdata['header_valid']) {
$result = true;
// It is OK to not have signed content - not all messages provide content.
// But if it is signed, it has to be valid
if (($this->sigdata['content_signed']) && (! $this->sigdata['content_valid'])) {
$result = false;
}
}
return $result;
}
function Dispatch() {
switch ($this->messagetype) {
case 'purge':
$this->response = $this->handler->Purge($this->sender, $this->recipients, $this->hub);
break;
case 'refresh':
$this->response = $this->handler->Refresh($this->sender, $this->recipients, $this->hub, false);
break;
case 'force_refresh':
$this->response = $this->handler->Refresh($this->sender, $this->recipients, $this->hub, true);
break;
case 'rekey':
$this->response = $this->handler->Rekey($this->sender, $this->data, $this->hub);
break;
case 'activity':
case 'response': // upstream message
case 'sync':
default:
if ($this->sender) {
$this->response = $this->handler->Notify($this->data, $this->hub);
}
break;
}
logger('response_to_return: ' . print_r($this->response,true),LOGGER_DATA);
if ($this->encrypted) {
$this->EncryptResponse();
}
return($this->response);
}
function EncryptResponse() {
$algorithm = Libzot::best_algorithm($this->hub['site_crypto']);
if ($algorithm) {
$this->response = Crypto::encapsulate(json_encode($this->response),$this->hub['hubloc_sitekey'], $algorithm);
}
}
}
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