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<?php |
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/** |
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* @author Russell MIchell 2018 <[email protected]> |
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* @package silverstripe-verifiable |
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*/ |
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namespace PhpTek\Verifiable\Backend; |
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use PhpTek\Verifiable\Backend\BackendProvider; |
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use GuzzleHttp\Client; |
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use Guzzle\Http\Exception\RequestException; |
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use Guzzle\Http\Message\Request; |
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use SilverStripe\Core\Config\Configurable; |
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use PhpTek\Verifiable\Exception\VerifiableBackendException; |
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use SilverStripe\Core\Injector\Injector; |
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/** |
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* See: https://chainpoint.org |
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*/ |
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class Chainpoint implements BackendProvider |
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{ |
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use Configurable; |
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/** |
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* Configuration of this backend's supported blockchain networks and |
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* connection details for each one's locally-installed full-node. |
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* |
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* Tieron supports Bitcoin and Ethereum, but there's nothing to stop custom |
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* routines and config appropriating an additional blockxhain network to which |
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* proofs can be saved e.g. a local Hyperledger Fabric network. |
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* |
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* @var array |
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* @config |
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*/ |
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private static $blockchain_config = [ |
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[ |
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'name' => 'Bitcoin', |
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'implementation' => 'bitcoind', |
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'host' => '', |
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'port' => 0, |
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], |
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[ |
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'name' => 'Ethereum', |
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'implementation' => 'geth', |
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'host' => '', |
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'port' => 0, |
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], |
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]; |
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/** |
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* @return string |
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*/ |
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public function name() : string |
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{ |
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return 'chainpoint'; |
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} |
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/** |
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* @param string $hash |
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* @return string |
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* @throws VerifiableBackendException |
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*/ |
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public function getProof(string $hash) : string |
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{ |
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$response = $this->client('/proofs', 'GET', $hash); |
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if ($response->getStatusCode() !== 200) { |
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throw new VerifiableBackendException('Unable to fetch proof from backend.'); |
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} |
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return $response->getBody(); |
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} |
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/** |
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* @param string $hash |
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* @return string |
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*/ |
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public function writeHash(string $hash) : string |
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{ |
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$response = $this->client('/hashes', 'POST', ['hashes' => $hash]); |
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return $response->getBody(); |
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} |
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/** |
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* Submit a chainpoint proof to the backend for verification. |
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* |
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* @param string $proof A valid JSON-LD Chainpoint Proof. |
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* @return bool |
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*/ |
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public function verifyProof(string $proof) : bool |
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{ |
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// Consult blockchains directly, if so configured and suitable |
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// blockchain full-nodes are available to our RPC connections |
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if ((bool) $this->config()->get('direct_verification') === true) { |
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return $this->backend->verifyDirect($proof); |
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} |
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$response = $this->client('/verify', 'POST', json_encode(['proofs' => [$hash]])); |
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return $response->getStatusCode() === 200 && |
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json_decode($response->getBody(), true)['status'] === 'verified'; |
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} |
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/** |
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* Return a client to use for all RPC traffic to this backend. |
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* |
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* @param string $url |
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* @param string $verb |
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* @param array $payload |
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* @return mixed null | Response Guzzle Response object |
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* @todo Client()->setSslVerification() if required |
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*/ |
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protected function client(string $url, string $verb, array $payload = []) |
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{ |
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$verb = strtoupper($verb); |
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$client = new Client([ |
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'base_uri' => $this->fetchNodeUrl(), |
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'timeout' => $this->config()->get('chainpoint', 'params')['timeout'], |
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]); |
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$request = new Request($verb, $url, $payload); |
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try { |
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return $client->send($request); |
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} catch (RequestException $e) { |
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return null; |
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} |
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} |
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/** |
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* The Tieron network comprises many nodes, some of which may or may not be |
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* online. Pings a randomly selected resource URL, containing IPs of each |
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* advertised node and calls each until one returns an HTTP 200. |
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* |
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* @return string |
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*/ |
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protected function fetchNodeUrl() |
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{ |
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$chainpointUrls = [ |
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'https://a.chainpoint.org/nodes/random', |
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'https://b.chainpoint.org/nodes/random', |
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'https://c.chainpoint.org/nodes/random', |
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]; |
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$url = $chainpointUrls[rand(count($randUrls))]; |
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$response = $this->client($url, 'GET'); |
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foreach (json_decode($response->getBody(), true) as $candidate) { |
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$response = $this->client($candidate['public_uri']); |
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if ($response->getStatusCode() === 200) { |
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return $candidate['public_uri']; |
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} |
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} |
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} |
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/** |
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* For each of this backend's supported blockchain networks, skips any intermediate |
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* verification steps through the Tieron network, preferring instead to calculate |
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* proofs ourselves in consultation directly with the relevant networks. |
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* |
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* @param string $proof The stored JSON-LD chainpoint proof |
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* @param array $networks An array of available blockchains to consult |
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* @return bool Returns true if each blockchain found in $network |
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* can verify our proof. |
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* @todo Implement via dedicated classes for each configured blockchain network. |
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*/ |
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protected function verifyProofDirect(string $proof, array $networks = []) |
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{ |
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$result = []; |
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foreach ($this->config()->get('blockchain_config') as $config) { |
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if (in_array($config['name'], $networks)) { |
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$implementation = ucfirst(strtolower($config['name'])); |
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$node = Injector::inst()->createWithArgs($implementation, [$config]); |
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$result[strtolower($config['name'])] = $node->verifyProof($proof); |
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} |
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} |
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return !in_array(false, $result); |
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} |
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} |
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phptek /
silverstripe-verifiable
Loading history...
The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g.
excluded_paths: ["lib/*"], you can move it to the dependency path list as follows:For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths