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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\Verify; |
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use SilverStripe\Core\Injector\Injector; |
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use SilverStripe\Core\Injector\Injectable; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\ClassInfo; |
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use PhpTek\Verifiable\Exception\VerifiableBackendException; |
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use PhpTek\Verifiable\Backend\BackendProvider; |
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/** |
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* Service class that works as an intermediary between any data model and the |
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* currently selected Merkle Tree storage backend. |
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* |
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* @todo Handle rate-limiting by the Chainpoint network and by repeated access to this controller |
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*/ |
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class VerifiableService |
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{ |
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use Injectable; |
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use Configurable; |
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/** |
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* @var BackendProvider |
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*/ |
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protected $backend; |
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/** |
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* |
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* @var array |
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*/ |
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protected $extra = []; |
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/** |
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* @return void |
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* @throws VerifiableBackendException |
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*/ |
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public function __construct() |
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{ |
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$this->setBackend(); |
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} |
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/** |
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* Wrapper around all backend methods. |
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* |
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* @param string $method The name of the method to call |
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* @param mixed $arg The argument to pass to $method |
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* @return mixed |
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* @throws InvalidArgumentException |
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*/ |
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public function call($method, $arg) |
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{ |
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if (!method_exists($this, $method)) { |
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throw new \InvalidArgumentException("$method doesn't exist."); |
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} |
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$this->backend->setDiscoveredNodes($this->getExtra()); |
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return $this->$method($arg); |
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} |
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/** |
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* Write a hash of data as per the "verifiable_fields" config static on each |
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* {@link DataObject}. |
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* |
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* @param array $data |
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* @return mixed The result of this call to the backend. |
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*/ |
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protected function write(array $data) |
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{ |
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return $this->backend->writeHash([$this->hash($data)]); |
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} |
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/** |
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* Fetch a chainpoint proof for the passed $uuid. |
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* |
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* @param string $uuid |
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* @return string The JSON-LD chainpoint proof. |
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*/ |
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protected function read(string $uuid) : string |
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{ |
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return $this->backend->getProof($uuid); |
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} |
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/** |
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* Verify the given JSON-LD chainpoint proof against the backend. |
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* |
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* @param string $proof A JSON-LD chainpoint proof. |
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* @return mixed |
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*/ |
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protected function verify(string $proof) |
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{ |
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return $this->backend->verifyProof($proof); |
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} |
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/** |
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* @param array $extra |
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* @return VerifiableService |
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*/ |
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public function setExtra(array $extra = []) |
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{ |
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if (!$extra) { |
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$this->backend->setDiscoveredNodes(); |
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$this->extra = $this->backend->getDiscoveredNodes(); |
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} else { |
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$this->extra = $extra; |
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} |
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return $this; |
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} |
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/** |
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* @return array |
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*/ |
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public function getExtra() |
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{ |
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return $this->extra; |
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} |
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/** |
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* Set, configure and return a new Merkle Tree storage backend. |
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* |
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* @param BackendProvider $provider Optional manually passed backend. |
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* @return VerifiableService |
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* @throws VerifiableBackendException |
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*/ |
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public function setBackend(BackendProvider $provider = null) |
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{ |
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if ($provider) { |
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$this->backend = $provider; |
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return $this; |
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} |
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$namedBackend = $this->config()->get('backend'); |
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$backends = ClassInfo::implementorsOf(BackendProvider::class); |
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foreach ($backends as $backend) { |
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if (singleton($backend)->name() === $namedBackend) { |
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$this->backend = Injector::inst()->create($backend); |
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return $this; |
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} |
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} |
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// Cannot continue without a legit backend |
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throw new VerifiableBackendException('No backend found'); |
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} |
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/** |
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* @return BackendProvider |
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*/ |
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public function getBackend() |
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{ |
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return $this->backend; |
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} |
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/** |
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* Hashes the data passed into the $hash param. |
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* |
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* @param array $data An array of data who's values should be hashed. |
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* @return string The resulting hashed data. |
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*/ |
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public function hash(array $data) : string |
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{ |
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$func = $this->backend->hashFunc(); |
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$text = json_encode($data); // json_encode() to stringify arrays of arbitary depth |
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return hash($func, $text); |
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} |
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} |
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phptek /
silverstripe-verifiable
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