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<?php

namespace lbuchs\WebAuthn\Attestation\Format;

use lbuchs\WebAuthn\Attestation\AuthenticatorData;

use lbuchs\WebAuthn\WebAuthnException;

use lbuchs\WebAuthn\Binary\ByteBuffer;

class AndroidKey extends FormatBase {

    private $_alg;

    private $_signature;

    private $_x5c;

    public function __construct($AttestionObject, AuthenticatorData $authenticatorData) {

        parent::__construct($AttestionObject, $authenticatorData);

        // check u2f data

        $attStmt = $this->_attestationObject['attStmt'];

        if (!\array_key_exists('alg', $attStmt) || $this->_getCoseAlgorithm($attStmt['alg']) === null) {

            throw new WebAuthnException('unsupported alg: ' . $attStmt['alg'], WebAuthnException::INVALID_DATA);

        }

        if (!\array_key_exists('sig', $attStmt) || !\is_object($attStmt['sig']) || !($attStmt['sig'] instanceof ByteBuffer)) {

            throw new WebAuthnException('no signature found', WebAuthnException::INVALID_DATA);

        }

        if (!\array_key_exists('x5c', $attStmt) || !\is_array($attStmt['x5c']) || \count($attStmt['x5c']) < 1) {

            throw new WebAuthnException('invalid x5c certificate', WebAuthnException::INVALID_DATA);

        }

        if (!\is_object($attStmt['x5c'][0]) || !($attStmt['x5c'][0] instanceof ByteBuffer)) {

            throw new WebAuthnException('invalid x5c certificate', WebAuthnException::INVALID_DATA);

        }

        $this->_alg = $attStmt['alg'];

        $this->_signature = $attStmt['sig']->getBinaryString();

        $this->_x5c = $attStmt['x5c'][0]->getBinaryString();

        if (count($attStmt['x5c']) > 1) {

            for ($i=1; $i<count($attStmt['x5c']); $i++) {

                $this->_x5c_chain[] = $attStmt['x5c'][$i]->getBinaryString();

            }

            unset ($i);

        }

    }

    /*

     * returns the key certificate in PEM format

     * @return string

     */

    public function getCertificatePem() {

        return $this->_createCertificatePem($this->_x5c);

    }

    /**

     * @param string $clientDataHash

     */

    public function validateAttestation($clientDataHash) {

        $publicKey = \openssl_pkey_get_public($this->getCertificatePem());

        if ($publicKey === false) {

            throw new WebAuthnException('invalid public key: ' . \openssl_error_string(), WebAuthnException::INVALID_PUBLIC_KEY);

        }

        // Verify that sig is a valid signature over the concatenation of authenticatorData and clientDataHash

        // using the attestation public key in attestnCert with the algorithm specified in alg.

        $dataToVerify = $this->_authenticatorData->getBinary();

        $dataToVerify .= $clientDataHash;

        $coseAlgorithm = $this->_getCoseAlgorithm($this->_alg);

        // check certificate

        return \openssl_verify($dataToVerify, $this->_signature, $publicKey, $coseAlgorithm->openssl) === 1;

    }

    /**

     * validates the certificate against root certificates

     * @param array $rootCas

     * @return boolean

     * @throws WebAuthnException

     */

    public function validateRootCertificate($rootCas) {

        $chainC = $this->_createX5cChainFile();

        if ($chainC) {

            $rootCas[] = $chainC;

        }

        $v = \openssl_x509_checkpurpose($this->getCertificatePem(), -1, $rootCas);

        if ($v === -1) {

            throw new WebAuthnException('error on validating root certificate: ' . \openssl_error_string(), WebAuthnException::CERTIFICATE_NOT_TRUSTED);

        }

        return $v;

    }

}