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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\DataExtension; |
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use PhpTek\Verifiable\Verify\ChainpointProof; |
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/** |
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* By attaching to any {@link DataObject} subclass, including {@link SiteTree} |
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* subclasses, and declaring a $verifiable_fields array in YML config, all subsequent |
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* database writes will be passed through here via onAfterWrite(); |
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* |
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* This {@link DataExtension} also provides a single field to which all verifiable |
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* chainpoint proofs are stored in a queryable JSON-aware field. |
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* |
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* @todo Flag to API users that confirmation has not yet occurred. |
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* @todo Store the hash function used and if subsequent verifications |
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* fail because differing hash functions are used, throw an exception |
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*/ |
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class VerifiableExtension extends DataExtension |
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{ |
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/** |
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* Declare a field on this owner where all chainpoint proofs should be stored. |
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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 $db = [ |
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'Proof' => ChainpointProof::class, |
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]; |
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/** |
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* These field's values will be hashed and committed to the current backend. |
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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 $verifiable_fields = []; |
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/** |
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* After each write, the desired field's data is compiled into a string |
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* and submitted as a hash to the currently configured backend. |
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* |
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* Once written, we poll the backend to receive the chainpoint proof |
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* which we'll need for subsequent verification checks made against the |
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* backend. |
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* |
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* @return void |
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*/ |
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public function onAfterWrite() |
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{ |
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parent::onAfterWrite(); |
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$verifiable = $this->normaliseData(); |
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if (count($verifiable)) { |
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$this->verifiableService->write($verifiable); |
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$this->verifiableService->queuePing($this->getOwner()); |
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} |
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} |
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/** |
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* Normalise this model's data such that it is best suited to being hashed. |
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* |
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* @return array |
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*/ |
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public function normaliseData() : string |
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{ |
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$fields = $this->getOwner()->config()->get('verifiable_fields'); |
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$verifiable = []; |
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foreach ($fields as $field) { |
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$verifiable[] = (string) $this->getOwner()->getField($field); |
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} |
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return $verifiable; |
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} |
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/** |
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* Central to the whole package, this method is passed an array of fields |
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* and their values, hashes them and will check that a chainpoint proof |
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* exists in the local database. If unsuccessful, we return false. |
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* Otherwise, we continue and consult the backend for the same proof. If one |
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* is found both locally and in the backed, then the supplied data is said to |
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* be verified. Note: See the $strict param to skip the local proof check. |
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* |
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* @param array $data An array of data to verify against the current backend. |
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* @param bool $strict True by default; That-is both the local database and |
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* the backend are consulted for a valid proof. If set |
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* to false, we bypass the local check and just consult |
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* the backend directly. |
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* @return bool True if the backend verifies the proof, false otherwise. |
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*/ |
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public function verify(array $data, bool $strict = true) : bool |
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{ |
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$hash = $this->verifiableService->hash($data); |
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$proof = $this->getOwner()->dbObject('Proof'); |
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// 1). Get the locally stored chainpoint proof |
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if (!$proof->match($hash)) { |
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return false; |
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} |
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// 2). Send the local proof to the backend for verification |
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if (!$this->verificationService->verify($proof)) { |
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return false; |
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} |
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// 3). Verification complete |
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return true; |
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} |
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} |
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phptek /
silverstripe-verifiable
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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